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1
Mangili, Michele. "Efficient in-network content distribution : wireless resource sharing, network planning, and security." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS182/document.
Повний текст джерелаАнотація:
Au cours de ces dernières années, la quantité de trafic que les utilisateurs Internet produisent sur une base quotidienne a augmenté de façon exponentielle, principalement en raison du succès des services de streaming vidéo, tels que Netflix et YouTube. Alors que les réseaux de diffusion de contenu (Content-Delivery Networks, CDN) sont la technique standard utilisée actuellement pour servir les demandes des utilisateurs, la communauté scientifique a formulé des propositions connues sous le nom de Content-Centric Networks (CCN) pour changer la pile de protocoles réseau afin de transformer Internet en une infrastructure de distribution de contenu. Dans ce contexte, cette thèse de doctorat étudie des techniques efficaces pour la distribution de contenu numérique en tenant compte de trois problèmes complémentaires : 1) Nous considérons le scénario d’un réseau hétérogène sans fil, et nous formulons un mécanisme pour motiver les propriétaires des points d’accès à partager leur capacité WiFi et stockage cache inutilisés, en échange d’une contribution économique.2) Nous étudions le problème centralisé de planification du réseau en présence de caches distribuées et (I) nous analysons la migration optimale du réseau à CCN; (II) nous comparons les bornes de performance d’un réseau CDN avec ceux d’un CCN, et (III) nous considérons un réseau CDN virtualisé et étudions le problème stochastique de planification d’une telle infrastructure.3) Nous considérons les implications de sécurité sur le contrôle d’accès et la traçabilité, et nous formulons ConfTrack-CCN, une extension deCCN utilisée pour garantir la confidentialité, traçabilité et l’évolution de la politique d’accès, en présence de caches distribuéesIn recent years, the amount of traffic requests that Internet users generate on a daily basis has increased exponentially, mostly due to the worldwide success of video streaming services, such as Netflix and YouTube. While Content-Delivery Networks (CDNs) are the de-facto standard used nowadays to serve the ever increasing users’ demands, the scientific community has formulated proposals known under the name of Content-Centric Networks (CCN) to change the network protocol stack in order to turn the network into a content distribution infrastructure. In this context this Ph.D. thesis studies efficient techniques to foster content distribution taking into account three complementary problems:1) We consider the scenario of a wireless heterogeneous network, and we formulate a novel mechanism to motivate wireless access point owners to lease their unexploited bandwidth and cache storage, in exchange for an economic incentive.2) We study the centralized network planning problem and (I) we analyze the migration to CCN; (II) we compare the performance bounds for a CDN with those of a CCN, and (III) we take into account a virtualized CDN and study the stochastic planning problem for one such architecture.3) We investigate the security properties on access control and trackability and formulate ConfTrack-CCN: a CCN extension to enforce confidentiality, trackability and access policy evolution in the presence of distributed caches
2
Нааем, Хазім Рахім Нааем. "Моделі та методи розподілу мережевого ресурсу комп'ютерних мереж геоінформаційной системи екологічного моніторингу". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/34184.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.13.05 – Комп'ютерні системи та компоненти. – Національний технічний університет "Харківський політехнічний інститут", Харків 2018.
Дисертаційна робота присвячена вирішенню науково-практичної задачі удосконалення методу розподілу мережевого ресурсу комп'ютерних систем геоінформаційної системи екологічного моніторингу, що дозволяє підвищити оперативність функціонування цієї систем за рахунок використання розроблених моделей та методів розподілу обчислювального ресурсу мережі. Розроблено метод ухвалення рішень по організації стаціонарних постів системи ГІС екологічного моніторингу, який у відмінності від існуючих враховує параметр, що визначає швидкість зміни рівня поточного забруднення, величину концентрації небезпечних хімічних речовин (ОХВ) і розу вітрів, характерну для цієї місцевості. Запропоновано модель трафіку передачі даних гібридної комп'ютерної мережі ГІС екологічного моніторингу, яка враховує злиття інформаційних потоків, що мають різні статистичні моделі та метод розподілу мережевого ресурсу гібридної комп'ютерної мережі ГІС за рахунок використання технології MIMO, що дозволяє на 12-15% понизити час, необхідне на доставку даних моніторингу. Розроблена модель програмно-апаратних засобів, використання якої враховує особливості безпровідній передачі даних від декількох джерел інформації у гібридної комп'ютерної мережі ГІС.Thesis for scientific degree candidate of technical sciences in the specialty 05.13.05 – computer systems and components. – National Technical University "Kharkіv Polytechnic Institute", Kharkіv 2018. The dissertation is devoted to the solution of the scientific and practical task of improving the method of network resource distribution of computer system of the geographic information system for ecological monitoring, which allows increasing the efficiency of functioning of these systems by using already developed models and methods of computing resource distribution of the network. The structure of GIS for environmental monitoring is developed, its main sub-systems and interaction principles are defined. The structure of hybrid computer network for digital data transmissions proposed, which allows optimizing the process of data transmission for environmental monitoring. The method of making decisions on the foundation of stationary posts of GIS for environmental monitoring is provided, which, in contrast to the existing ones, takes into account the parameter that determines the alteration rate of the then-current pollution level, the magnitude of the concentration of hazardous chemicals (HAZCHEM), and the wind rose specific for the area in question. Also, this method takes into consideration that the difference of HAZCHEM concentration in space varies from point to point. The whole from the abovementioned allows localizing zones of potential pollution and severely reducing the number of specialized observation posts (by 10-15%). The data transmission traffic model is developed for the hybrid computer network (CN) of the environmental monitoring GIS. This model takes into account the merging of information flows, which have different statistical models. The use of the offered model allows shortening the computer network data transmission rate by 13%. The network resources distribution method for the hybrid computer network of the environmental monitoring GIS is developed through the use of MIMO technology, which allows reducing the time required for monitoring data delivery by 12-15%. The model of hardware and software has been developed, the usage of which considers the features of wireless data transmission from several information sources in the hybrid computer network of GIS, thereby allowing to reduce the package loss ratio and to increase the speed of data transmission for the hybrid CN of GIS. The offered efficiency enhancement models and methods in computer networks of GIS have been examined in simulation modeling and experimental studies, which have thereby confirmed the veracity and significance of the derived results. The developed software and hardware model for ecological monitoring GIS allows reducing dates of receipt, processing and analysis of the ecological data, improving veracity and quality of the received results, and ensuring information safety.
3
Нааем, Хазім Рахім Нааем. "Моделі та методи розподілу мережевого ресурсу комп'ютерних мереж геоінформаційной системи екологічного моніторингу". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/34163.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.13.05 – Комп'ютерні системи та компоненти. – Національний технічний університет "Харківський політехнічний інститут", Харків 2018.
Дисертаційна робота присвячена вирішенню науково-практичної задачі удосконалення методу розподілу мережевого ресурсу комп'ютерних систем геоінформаційної системи екологічного моніторингу, що дозволяє підвищити оперативність функціонування цієї систем за рахунок використання розроблених моделей та методів розподілу обчислювального ресурсу мережі. Розроблено метод ухвалення рішень по організації стаціонарних постів системи ГІС екологічного моніторингу, який у відмінності від існуючих враховує параметр, що визначає швидкість зміни рівня поточного забруднення, величину концентрації небезпечних хімічних речовин (ОХВ) і розу вітрів, характерну для цієї місцевості. Запропоновано модель трафіку передачі даних гібридної комп'ютерної мережі ГІС екологічного моніторингу, яка враховує злиття інформаційних потоків, що мають різні статистичні моделі та метод розподілу мережевого ресурсу гібридної комп'ютерної мережі ГІС за рахунок використання технології MIMO, що дозволяє на 12-15% понизити час, необхідне на доставку даних моніторингу. Розроблена модель програмно-апаратних засобів, використання якої враховує особливості безпровідній передачі даних від декількох джерел інформації у гібридної комп'ютерної мережі ГІС.Thesis for scientific degree candidate of technical sciences in the specialty 05.13.05 – computer systems and components. – National Technical University "Kharkіv Polytechnic Institute", Kharkіv 2018. The dissertation is devoted to the solution of the scientific and practical task of improving the method of network resource distribution of computer system of the geographic information system for ecological monitoring, which allows increasing the efficiency of functioning of these systems by using already developed models and methods of computing resource distribution of the network. The structure of GIS for environmental monitoring is developed, its main sub-systems and interaction principles are defined. The structure of hybrid computer network for digital data transmissions proposed, which allows optimizing the process of data transmission for environmental monitoring. The method of making decisions on the foundation of stationary posts of GIS for environmental monitoring is provided, which, in contrast to the existing ones, takes into account the parameter that determines the alteration rate of the then-current pollution level, the magnitude of the concentration of hazardous chemicals (HAZCHEM), and the wind rose specific for the area in question. Also, this method takes into consideration that the difference of HAZCHEM concentration in space varies from point to point. The whole from the abovementioned allows localizing zones of potential pollution and severely reducing the number of specialized observation posts (by 10-15%). The data transmission traffic model is developed for the hybrid computer network (CN) of the environmental monitoring GIS. This model takes into account the merging of information flows, which have different statistical models. The use of the offered model allows shortening the computer network data transmission rate by 13%. The network resources distribution method for the hybrid computer network of the environmental monitoring GIS is developed through the use of MIMO technology, which allows reducing the time required for monitoring data delivery by 12-15%. The model of hardware and software has been developed, the usage of which considers the features of wireless data transmission from several information sources in the hybrid computer network of GIS, thereby allowing to reduce the package loss ratio and to increase the speed of data transmission for the hybrid CN of GIS. The offered efficiency enhancement models and methods in computer networks of GIS have been examined in simulation modeling and experimental studies, which have thereby confirmed the veracity and significance of the derived results. The developed software and hardware model for ecological monitoring GIS allows reducing dates of receipt, processing and analysis of the ecological data, improving veracity and quality of the received results, and ensuring information safety.
4
Liu, Qingyun. "Statistical Process Control for the Fairness of Network Resource Distribution." FIU Digital Commons, 2011. http://digitalcommons.fiu.edu/etd/518.
Повний текст джерелаАнотація:
The purpose of this research is to develop a statistical method to monitor the fairness of network resource distribution. The newly developed fairness score function allows users to have the same or different priority levels. Especially, this function possesses all the necessary properties required as a quality characteristic for the purpose of statistical process control.
The main objective is to find the critical values for the statistical test. Monte Carlo simulation is used to find the critical values. When the users have the same priority level, a table of the critical values is given for different sample sizes and different significance levels. When the users have different priority levels, it is difficult to generate a similar table since the users’ priority levels vary. Therefore, the critical values are computed for given priority levels. In both cases, an example is given to demonstrate the approach developed in this study.
5
Garkusha, Sergey, Haider Al-Janabi, and Aymen Al-Dulaimi. "Model of Distribution of Frequency Resource in the WiMAX Mesh-Network." Thesis, TCSET'2014, 2014. http://dspace.puet.edu.ua/handle/123456789/1956.
Повний текст джерелаАнотація:
The frequency resource distribution
mathematical model is offered as a problem of
subchannels’ number balancing between radio
channels, which are formed by mesh-stations of the
wireless network. The use of the offered model has
made it possible to raise efficiency of the wireless
mesh-network as a whole and ensure the
“bottlenecks” absence
6
Ekstrand, Aaron Jordan. "A Fast and Efficient Method for Power Distribution Network Reconfiguration." OpenSIUC, 2017. https://opensiuc.lib.siu.edu/theses/2094.
Повний текст джерелаАнотація:
We have proposed a method by which the topology of a network might be discovered through an algorithm like the distributed Bellman-Ford algorithm. We have explored the inner workings of two methods to automate power distribution network reconfiguration, the ILP Solver and the Heuristic Solver. We have seen how networks of different shapes can be translated into a flattened topology, which is necessary preprocessing to find a power assignment solution for a network. We have also seen some experimental results comparing the performance of the ILP Solver and the Heuristic Solver. The Heuristic Solver is a very fast, efficient algorithm to reconfigure power distribution, which is important in the case of an emergency. It performs consistently with near perfect results at a speed that is orders of magnitude quicker than the ILP Solver in almost all cases. In an application where a network is small and time is not an important constraint, the ILP Solver could possibly be preferable, but in any context where time is sensitive and near-perfect results are as acceptable as perfect results, the Heuristic Solver is much preferable. There is always room for improvement. Future tests should perhaps allow for non-integer capacity units, or loads that require other values than unit capacity. Optimizing each algorithm by rewriting them in C could give more optimized tests, though this may not be necessary to make judgments about implementing one or the other. There may be some ways to improve the Heuristic Solver, such as arranging the ordered_links in some way that could be more optimal. The algorithm could also be improved by taking advantage of the fact that once there are no more sources with capacity to provide any loads, the process of trying to assign loads to them for power supply can cease. Perhaps this method could be combined with other methods that do not presently account for load priorities or place as much value on fast execution.
7
Galymov, Birzhan. "Distribution Network Reconfiguration For Loss Reduction By Multi-branch Exchange Method." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614663/index.pdf.
Повний текст джерелаАнотація:
As structure and size of electric power distribution systems are getting more complex, distribution automation schemes become more attractive. One of the features that is desirable in an automated system is feeder reconfiguration for loss reduction. Loss reduction can make considerable savings for a utility and results in released system capacity. There is also improved voltage regulation in the system as a result of reduced feeder voltage drop.
In this thesis, multi branch exchange algorithm is introduced to solve the network reconfiguration for loss reduction problem. The proposed technique is based on heuristic techniques applied to constraint satisfaction optimization problems. A critical review of earlier methods related with feeder reconfiguration is presented. A computer program was developed using Matlab to simulate this algorithm and results of simulations demonstrate its advantages over single branch exchange method. Moreover, the results show that the final configuration is independent of the initial configuration and give assurance that any solution offered will have a radial configuration with all loads connected.
8
Akperi, Brian Temisan. "An informed long-term forecasting method for electrical distribution network operators." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/12342/.
Повний текст джерелаАнотація:
Northern Powergrid (NPG) is an electrical distribution network operator in the UK servicing Yorkshire and the Northeast of England. Currently they produce long-term eight year forecasts for each substation on the network with an emphasis on an annual maximum demand (MD) figure. The current method used by NPG is thought to oversimplify the problem and does not give enough insight into changes in substation demand. In order to inform their current forecast, the novel CL-ANFIS method uses a combination of machine learning techniques for both forecasting and general insight to the drivers of demand. Also introduced here are novel techniques for determination of MD at NPG and methods for handling load transfer periods. In order to address a problem of this size, a twofold approach is taken. One is to address the drivers of demand such as weather, economic or demographic data sets through the use of statistics and machine learning techniques. The other is to address the long-term forecasting problem with a transparent technique that can aid in explaining the drivers of demand on any given substation. Techniques used include cluster analysis on demographic data sets in addition to ANFIS as a forecasting method. The results of the novel CL-ANFIS method are compared against the current NPG forecast and show how more insight into substation demand profiles can drive the decision-making process. This is done through a combination of using a tailored customer database for NPG and leveraging the information provided by the membership functions of ANFIS.
9
Akkas, Izzet Saygin. "Reliability Based Water Distribution Network Design." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607830/index.pdf.
Повний текст джерелаАнотація:
The need of water and the limited sources, force the researchers to find the most economical and feasible solution in the design of a water distribution network. In this study, reliability and optimization of a water distribution network are taken into account together in the design stage of the network. The relationship between reliability of a water distribution network and its cost is examined during the design of a water distribution network. A methodology for deciding the reliability level of the selected design is proposed by examining the reliability-cost relationship. The design alternatives for the case study area are obtained by the aid of a commercially available software WADISO employing partial enumeration optimization technique. The reliability value for each of the design alternative is calculated according to Misirdali (2003)&rsquos adaptation based on the methodology proposed by Bao and Mays (1990) by the aid of a hydraulic network solver program HapMam prepared by Nohutç
u (2002). For purposes of illustration, the skeletonized form of Ankara Water Distribution Network subpressure zone (N8-1) is taken as the case study area. The methodology in this study, covering the relation between the reliability and the cost of a water distribution network and the proposed reliability level can be used in the design of new systems.
10
Keles, Gultekin. "Water Distribution Network Design By Partial Enumeration." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606816/index.pdf.
Повний текст джерелаАнотація:
Water distribution networks are being designed by traditional methods based on rules-of-thumb and personal experience of the designer. However, since there is no unique solution to any network design, namely there are various combinations of
pipes, pumps, tanks all of which satisfy the same pressure and velocity restrictions, it is most probable that the design performed by traditional techniques is not the optimum one.
This study deals how an optimization technique can be a useful tool for a designer during the design to find a solution. The method used within the study is the partial enumeration technique developed by Gessler. The technique is applied by a
commercially available software, i.e. WADISO SA. The study is focused on discrepancies between a network designed by traditional techniques and the same network designed by partial enumeration method. Attention is given to steps of enumeration, which are basically grouping of pipes, candidate pipe size and price function assignments, to demonstrate that the designers can control all the phases of optimization process. In this respect, special attention is given to price functions to show the effect of them on the result. The study also revealed that the cost of fitting materials cannot be included in the price function although it may have significant
effect in a system composed of closely located junctions.
The results obtained from this study are useful to show that although optimization methods do not provide a definite solutionpartial enumeration method can assist designers to select the optimum system combination.
11
Marguet, Raphaël. "Improved fault localization method for electrical power distribution networks." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENT015/document.
Повний текст джерелаАнотація:
Ces travaux proposent des améliorations de méthodes de localisation desdéfauts électriques sur les réseaux électriques de distribution. Les réseaux de transportont rapidement été instrumenté en élément de protection. En effet, un incident survenantsur le réseau de transport peut entrainer de graves conséquences s’il n’est pas traité rapidement.Les réseaux de distribution quand à eux possèdent un schéma de protectionminimal. Cependant le développement des smart grids (ou réseaux intelligents) amène denouvelles possibilités avec l’ajout d’équipements de mesures sur le réseau de distribution.Les travaux présentés dans cette thèse développent deux méthodes de localisation de défaut.La première permet de mieux utiliser l’équipement déjà en place (indicateurs depassage de défaut) afin d’isoler de manière rapide et fiable la zone concernée par le défaut.La deuxième permet une localisation précise (en distance) des différents lieux de défautspossibles à partir de mesures électriquesThis thesis proposes to improve fault localization methods for electricalpower distribution networks. Transmission networks were quickly equipped with protectionand fault localization equipments. Indeed, faults on the transmission network need tobe dealt with quickly in order to avoid serious consequences. Unlike transmission networks,distribution networks have a minimal protection scheme. The smart grid developmentsbring new possibilities with the installation of new equipments giving access to many newvariables. The work presented in this thesis develop two fault localization method. Thefirst aims in using the equipment already installed (fault indicators) in order to isolatequickly and efficiently the zone concerned by the fault. The second method performs aprecise localization (in distance) of the different possible fault locations from the electricalmeasurements made on the network
12
Lee, Jinpyo. "A method for distribution network design and models for option-contracting strategy with buyers' learning." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/29620.
Повний текст джерелаАнотація:
Thesis (Ph.D)--Industrial and Systems Engineering, Georgia Institute of Technology, 2009.Committee Chair: Kleywegt, Anton J.; Committee Member: Ayhan, Hayriye; Committee Member: Dai, Jim; Committee Member: Erera, Alan; Committee Member: Ward, Amy R. Part of the SMARTech Electronic Thesis and Dissertation Collection.
13
Nyamugure, Philimon. "Modification, development, application and computational experiments of some selected network, distribution and resource allocation models in operations research." Thesis, University of Limpopo, 2017. http://hdl.handle.net/10386/1930.
Повний текст джерелаАнотація:
Thesis (Ph.D. (Statistics)) -- University of Limpopo, 2017Operations Research (OR) is a scientific method for developing quantitatively well-grounded recommendations for decision making. While it is true that it uses a variety of mathematical techniques, OR has a much broader scope. It is in fact a systematic approach to solving problems, which uses one or more analytical tools in the process of analysis. Over the years, OR has evolved through different stages. This study is motivated by new real-world challenges needed for efficiency and innovation in line with the aims and objectives of OR – the science of better, as classified by the OR Society of the United Kingdom. New real-world challenges are encountered on a daily basis from problems arising in the fields of water, energy, agriculture, mining, tourism, IT development, natural phenomena, transport, climate change, economic and other societal requirements. To counter all these challenges, new techniques ought to be developed. The growth of global markets and the resulting increase in competition have highlighted the need for OR techniques to be improved. These developments, among other reasons, are an indication that new techniques are needed to improve the day-to-day running of organisations, regardless of size, type and location. The principal aim of this study is to modify and develop new OR techniques that can be used to solve emerging problems encountered in the areas of linear programming, integer programming, mixed integer programming, network routing and travelling salesman problems. Distribution models, resource allocation models, travelling salesman problem, general linear mixed integer ii programming and other network problems that occur in real life, have been modelled mathematically in this thesis. Most of these models belong to the NP-hard (non-deterministic polynomial) class of difficult problems. In other words, these types of problems cannot be solved in polynomial time (P). No general purpose algorithm for these problems is known. The thesis is divided into two major areas namely: (1) network models and (2) resource allocation and distribution models. Under network models, five new techniques have been developed: the minimum weight algorithm for a non-directed network, maximum reliability route in both non-directed and directed acyclic network, minimum spanning tree with index less than two, routing through 0k0 specified nodes, and a new heuristic to the travelling salesman problem. Under the resource allocation and distribution models section, four new models have been developed, and these are: a unified approach to solve transportation and assignment problems, a transportation branch and bound algorithm for the generalised assignment problem, a new hybrid search method over the extreme points for solving a large-scale LP model with non-negative coefficients, and a heuristic for a mixed integer program using the characteristic equation approach. In most of the nine approaches developed in the thesis, efforts were done to compare the effectiveness of the new approaches to existing techniques. Improvements in the new techniques in solving problems were noted. However, it was difficult to compare some of the new techniques to the existing ones because computational packages of the new techniques need to be developed first. This aspect will be subject matter of future research on developing these techniques further. It was concluded with strong evidence, that development of new OR techniques is a must if we are to encounter the emerging problems faced by the world today. Key words: NP-hard problem, Network models, Reliability, Heuristic, Largescale LP, Characteristic equation, Algorithm.
14
Mkansi, Marcia. "Management of the e-retail supply and distribution network : a resource-based view of the UK grocery sector." Thesis, University of Bolton, 2013. http://ubir.bolton.ac.uk/627/.
Повний текст джерелаАнотація:
The motivation of this research emerged as a reaction to imbalances in the UK grocery retailing market. In 2012-2013, total grocery retail sales amounted to £163.2 billion (bn), of which £5.6bn (3%) was generated through the online channel. Offline sales which amounted to £157.6bn are greater than all total combined non-grocery retail sales for the same period. Notably, online grocery sales of 3.4% posted the lowest percentage compared to all other segments of non-grocery e-retailing. The problem lies with challenges associated with managing supply and distribution of e-groceries, which constitute one of the greatest barriers to grocery e-retailing. These challenges led Somerfield to close its e-operations. This further heightens the online-offline grocery imbalances as only few grocery retailers are able to sustain their online operation. Of the 24 grocery e-retailers with more than ten stores in the UK, Asda, Sainsbury’s, Tesco, and Waitrose (ASTW) continue to stamp their authority in the market. Studies that examined the e-operations of ASTW attribute their cutting edge practice in grocery e-retailing to an overwhelming difference in resources (stores). It is the fundamental principles such as store assets that have seen Tesco’s pioneering in-store model outperform rivals in penetrating the market. These findings more than anything, have galvanized this research interest into deeper understanding of stores and managerial capabilities from a resource-based view (RBV). The study examines the four case studies (ASTW) using a mixed method approach to reduce the methodological challenges inherent in the RBV theory. Respondents were purposively sampled and responses were elicited using semi-structured interviews. The findings reveal the value of the resources from RBV perspective, and the prominence and interdependence of chain resources in creating sustainable competitive advantage (SCA). The study developed a resource-based strategy that may minimise some of the challenges, especially the cost of supply and distribution. Although the findings provide a RBV of stores and managerial capabilities in grocery e-retailing, the extent of value is limited to access and disclosure of sensitive information. Future studies must assess SCA, in partnership with the organisation to avoid the latter limitations. It is anticipated that the findings will pave the way for future research in e-retailing through contribution to both knowledge and practice. From the perspective of knowledge contribution, the research empirically tested the robustness of RBV using mixed method in the context of the grocery sector. Meanwhile, the developed strategy is also highly valuable in practice, in that it could offer useful insights for practitioners to better improve the efficiency and resilience of their e-retailing adoption.
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Chan, Kevin Sean. "Towards securing networks of resource constrained devices a study of cryptographic primitives and key distribution schemes /." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26651.
Повний текст джерелаАнотація:
Thesis (Ph.D)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009.Committee Chair: Fekri, Faramarz; Committee Member: James McClellan; Committee Member: John Copeland; Committee Member: Steven McLaughlin; Committee Member: Yajun Mei. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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Guan, Zhengyuan. "A New Islanding Detection Method Based On Wavelet-transform and ANN for Inverter Assisted Distributed Generator." UKnowledge, 2015. http://uknowledge.uky.edu/ece_etds/72.
Повний текст джерелаАнотація:
Nowadays islanding has become a big issue with the increasing use of distributed generators in power system. In order to effectively detect islanding after DG disconnects from main source, author first studied two passive islanding methods in this thesis: THD&VU method and wavelet-transform method. Compared with other passive methods, each of them has small non-detection zone, but both of them are based on the threshold limit, which is very hard to set. What’s more, when these two methods were applied to practical signals distorted with noise, they performed worse than anticipated.
Thus, a new composite intelligent based method is presented in this thesis to solve the drawbacks above. The proposed method first uses wavelet-transform to detect the occurrence of events (including islanding and non-islanding) due to its sensitivity of sudden change. Then this approach utilizes artificial neural network (ANN) to classify islanding and non-islanding events. In this process, three features based on THD&VU are extracted as the input of ANN classifier. The performance of proposed method was tested on two typical distribution networks. The obtained results of two cases indicated the developed method can effectively detect islanding with low misclassification.
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Bazargan-Harandi, Hamid. "Neural network based simulation of sea-state sequences." Thesis, Brunel University, 2006. http://bura.brunel.ac.uk/handle/2438/379.
Повний текст джерелаАнотація:
The present PhD study, in its first part, uses artificial neural networks (ANNs), an optimization technique called simulated annealing, and statistics to simulate the significant wave height (Hs) and mean zero-up-crossing period ( ) of 3-hourly sea-states of a location in the North East Pacific using a proposed distribution called hepta-parameter spline distribution for the conditional distribution of Hs or given some inputs. Two different seven- network sets of ANNs for the simulation and prediction of Hs and were trained using 20-year observed Hs’s and ’s. The preceding Hs’s and ’s were the most important inputs given to the networks, but the starting day of the simulated period was also necessary. However, the code replaced the day with the corresponding time and the season. The networks were trained by a simulated annealing algorithm and the outputs of the two sets of networks were used for calculating the parameters of the probability density function (pdf) of the proposed hepta-parameter distribution. After the calculation of the seven parameters of the pdf from the network outputs, the Hs and of the future sea-state is predicted by generating random numbers from the corresponding pdf. In another part of the thesis, vertical piles have been studied with the goal of identifying the range of sea-states suitable for the safe pile driving operation. Pile configuration including the non-linear foundation and the gap between the pile and the pile sleeve shims were modeled using the finite elements analysis facilities within ABAQUS. Dynamic analyses of the system for a sea-state characterized by Hs and and modeled as a combination of several wave components were performed. A table of safe and unsafe sea-states was generated by repeating the analysis for various sea-states. If the prediction for a particular sea-state is repeated N times of which n times prove to be safe, then it could be said that the predicted sea-state is safe with the probability of 100(n/N)%. The last part of the thesis deals with the Hs return values. The return value is a widely used measure of wave extremes having an important role in determining the design wave used in the design of maritime structures. In this part, Hs return value was calculated demonstrating another application of the above simulation of future 3-hourly Hs’s. The maxima method for calculating return values was applied in such a way that avoids the conventional need for unrealistic assumptions. The significant wave height return value has also been calculated using the convolution concept from a model presented by Anderson et al. (2001).
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Nilsson, Adam. "Underlag för prioritering och kostnadsberäkning vid reinvestering i luftledningsnät : En fallstudie på Sinntorp, ett av Ellevios besiktningsområden." Thesis, Uppsala universitet, Fasta tillståndets fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-280883.
Повний текст джерелаАнотація:
This thesis considers how an assessment method for reinvestments in the distribution grid can be designed and implemented. The assessment method was created to give long-term estimations of the amount overhead lines that could be substituted with underground cables and how to prioritize between different areas. The regulation of power grid companies was reviewed to highlight important factors for profitable reinvestments. The assessment method was implemented for overhead lines in Ellevio´s distribution grid using the database program FME and validated against real reinvestment decisions in a case study area called Sinntorp. The resulting reinvestment proposals mainly consist of replacing older grid sections and sections where expensive maintenance is planned in the future. The script show similar results as real reinvestment decisions but small differences are noticed related to the script’s hard focus on older grid sections. The script has potential to be used on Ellevio´s entire overhead line network but this requires work to complete essential data. Further validation on new areas are also desired to see if results are reasonable and if the script can be developed to consider more reinvestment factors.
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Gossman, Stephanie Mizzell. "A new proposed method of contingency ranking." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34667.
Повний текст джерелаАнотація:
Security analysis of a power system requires a process called contingency analysis that analyzes results from all possible single contingencies (i.e. outages) in the system. The process of contingency analysis requires the definition of a parameter that is used to monitor a certain aspect of the system, which is called a performance index. The performance index definitions used traditionally have been highly nonlinear, and the results have not accurately predicted the outcome of the performance index in some cases. These incorrect results are referred to as misrankings since the contingency results are usually placed in order of severity so that the most severe cases are evident.
This thesis considers a new definition of contingency ranking using a more linearized definition of the performance index. The construction of both the new, proposed definition and the classic definition both consider the current loading of circuits in the system as compared to their rated values. Specifically, the parameter measured by the proposed definition measures the difference, while the more nonlinear definition uses a ratio of the two quantities, which is then raised to a higher power.
A small, four bus test system is used to demonstrate the benefits of the new, more linearized definition. The average percent error for all single line contingencies of the system decreased by over 9.5% using the proposed definition as compared to the previous one. This decrease in error allows this performance index to monitor a similar parameter (comparing current loading and current rating of the lines) and achieve a higher degree of accuracy. Further linearization of this proposed definition also shows a reduction in the average percent error by an additional 22% so that when compared to the original, highly nonlinear definition, the average error is reduced by almost 30%. By linearizing the definition of the performance index, the results are more accurate and misrankings are less likely to occur from the security analysis process.
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Costa, BÃrbara Cristina Alves da. "Load measurement error influence on friction factor calibration of pipe water distribution networks through do reverse transient method and genetic algorithm." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13621.
Повний текст джерелаАнотація:
O estudo de redes hidrÃulicas para fins de operaÃÃo ou anÃlise de viabilidade para ampliaÃÃo ou recuperaÃÃo das mesmas à iniciado pela calibraÃÃo, neste contexto, entendida como identificaÃÃo de parÃmetros tais como: fator de atrito, rugosidade e diÃmetro. O MÃtodo Transiente Inverso em conjunto com Algoritmo genÃtico se mostra eficiente nessa tarefa. O referido mÃtodo emprega o MÃtodo das CaracterÃsticas na soluÃÃo das equaÃÃes de movimento para escoamento transiente em tubos de redes e a otimizaÃÃo das soluÃÃes à baseada na Teoria Evolutiva e avaliada por uma funÃÃo objetivo, que neste estudo à o somatÃrio do mÃdulo da diferenÃa entre as cargas medidas e calculadas pelo modelo para cada conjunto de soluÃÃes. Considerando que o objetivo do desenvolvimento de modelos matemÃticos para a calibraÃÃo de redes hipotÃticas à a utilizaÃÃo dos mesmos em redes reais, e que nessas, a coleta de dados de carga està sujeita a erros de mediÃÃo, seja devido a defeitos nos equipamentos seja por condiÃÃes ambiente desfavorÃveis ou outros efeitos aleatÃrios e tendo em vista a relevÃncia dos fatores de atrito nas tubulaÃÃes, pela sua relaÃÃo com perdas de carga que devem ser controladas para um Ãtimo funcionamento de redes, garantindo um abastecimento contÃnuo em quantidade e condiÃÃes de funcionamento adequados, este trabalho propÃe-se a verificar a interferÃncia da presenÃa de erros de mediÃÃo de carga transiente na identificaÃÃo dos fatores de atrito em duas redes hidrÃulicas hipotÃticas. As mesmas sÃo de portes diferentes com relaÃÃo ao nÃmero de anÃis, nÃs e tubos. Ambas sÃo alimentadas por um reservatÃrio cada. As condiÃÃes transientes sÃo atribuÃdas a uma manobra de vÃlvula instalada em um dos nÃs de cada rede. A coleta de dados de carga à restrita a 20% dos nÃs de cada rede, sendo que um deles à o nà onde se encontra a vÃlvula. O tempo de observaÃÃo do transiente hidrÃulico à restrito ao tempo da manobra de vÃlvula, 20s, e ocorre em intervalos de 0,1s, resultando em 200 registros de carga. A condiÃÃo permanente das redes à inicialmente desconhecida o conhecimento acerca da mesma à restrito a carga nos reservatÃrios e demandas nos nÃs, bem como diÃmetros dos tubos, os fatores de atrito sÃo inicialmente estipulados. A determinaÃÃo das condiÃÃes permanente e transiente bem como a identificaÃÃo dos fatores de atrito à realizada com a utilizaÃÃo de um modelo hidrÃulico e geram cargas transientes que sÃo consideradas convencionalmente verdadeiras, essas entÃo recebem incrementos de diversos erros sistemÃticos e aleatÃrios, que geram novas cargas e essas sÃo consideradas coletadas com erros de mediÃÃo. A partir dessas novas cargas sÃo realizadas identificaÃÃes de fatores de atrito, os quais sÃo comparados com os que foram obtidos considerando um caso ideal de cargas sem erros de mediÃÃo. A referida comparaÃÃo à realizada atravÃs do Erro MÃdio Relativo e da FunÃÃo Objetivo Ãtima. Os resultados encontrados demonstram que os erros de mediÃÃo interferem na identificaÃÃo dos fatores de atrito apesar de nÃo ser possÃvel delinear uma relaÃÃo entre os mesmos.The study of hydraulic networks for operation purposes or viability analysis for extension or renovation of the same is started the calibration in this context understood as identification parameters, such as friction coefficient, surface roughness and diameter. The Transient Inverse Method in conjunction with genetic algorithm is efficient in this task shows. This method employs the method of characteristics in the solution of the equations of motion for transient flow in networks of pipes and the optimization of solutions is based on Evolutionary Theory and evaluated by an objective function, which in this study is the sum of the difference between the module loads measured and calculated by the model for each set of solutions. Whereas the objective of the development of mathematical models for calibration hypothetical networks is their use in real networks, and that these, the collection of payload data is subject to measurement errors, is due to defects in the equipment or by conditions unfavorable environment or other random effects and taking into account the relevance of friction factors in pipelines, by their relationship to head losses that must be controlled to a great operation of networks, ensuring a continuous supply in quantity and appropriate operating conditions, this work is proposed to verify the influence of the presence of transient load measurement errors in the identification of friction factors in two hypothetical hydraulic networks. They are of different sizes with the number of rings, knots and tubes. Both are each fed by a reservoir. The transient conditions are assigned to a valve maneuver installed in one of the nodes of each network. The load data collection is restricted to 20% of the nodes in each network, one of which is the node where the valve is located. The hydraulic transient observation time is restricted to the valve maneuver time, 20s, and occurs at intervals of 0.1s, resulting in 200 charge records. The permanent condition of networks is initially unknown knowledge about the same is restricted to load in the reservoirs and demands on us as well as pipe diameter, the friction factors are initially stipulated. The determination of the permanent and transient conditions and the identification of the friction factors is performed using a hydraulic model and generate transient loads which are conventionally considered true, then these various steps of receiving systematic and random errors, which generate new burdens and these are considered collected with measurement errors. From these new loads are carried IDs friction factors, which are compared with those obtained considering an ideal case with no measurement errors loads. This comparison is performed using the mean relative error and function great goal. The results show that measurement errors in the identification of interfering friction factors although not possible to draw a relationship between them.
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Korček, František. "Návrh projektu zavedení elektronického obchodu s využitím metodiky projektového managementu." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2014. http://www.nusl.cz/ntk/nusl-224453.
Повний текст джерелаАнотація:
Master´s thesis focuses on the utilisation of project management methodology within the design of a project in a selected company. It specifies theoretical sources which are the key for the project plan proposal. It applies the theory to the project of introducing electronic commerce in the field of building material sale. The thesis containts the plan proposal and optimisation of the project in terms of time, costs and use of available resources, together with the analysis of a company environment.
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Reiter, Martin. "Analýza variant paralelního provozu oblastí 110 kV Čebín a Sokolnice." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242133.
Повний текст джерелаАнотація:
The diploma thesis is focused on the analysis of parallel operation of Čebín and Sokolnice substations. Different variants of parallel operation are researched. A calculation of steady state by the iterative method is described in the theoretical part. The next part briefly mentions a short-circuit and dimensioning of conductors. The possibility of overloading of lines and transformers is discussed in the last chapter of the theoretical part. The current state of the situation is described in the practical part. Main goal of the practical part of the diploma thesis is to design a configuration capable to parallel operation. Also another configuration of supply of this area is designed. There must be no direct connection between Čebín and Sokolnice substations on 110kV level in this configuration. This configuration should eliminate a transit flow of power. Each configuration has to fulfill the requirements on the steady state and on short-circuit current capability. One of the last chapters is focused on the steps, that should by undertaken to prevent transit flow of power.
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Jurča, Ondřej. "Ustálený chod a zkratové poměry v síti 110 kV E.ON napájené z rozvodny 110 kV Otrokovice v roce 2011." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219016.
Повний текст джерелаАнотація:
Distribution network 110 kV owned by E. ON in the area Otrokovice; powered by 110 kV and two variants of involvement contained.The first option is basic involvement, without the use of the bridge. The second option includes involvement with the bridge. The aim of this study is to compare; by calculating the steady-state network operation and short circuit conditions of the network, the involvement of these two options. The thesis is divided into two parts, theoretical and practical. The theoretical part consists of a description of the steady operation of networks of high-voltage and short circuit ratio calculations. Load flow calculations are described by the Gauss-Seidel and Newton iterative method. In the case of short-circuit conditions, the effects of their characteristic values, processes and various methods of calculation are described.In the second part, this theoretical knowledge is applied to input data and dispatching programme with the appropriate calculations of network operation and short circuit conditions. The calculated values are listed in the thesis, on the basis of which an evaluation of the two possible connections is made.
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Khan, Kashif. "A distributed computing architecture to enable advances in field operations and management of distributed infrastructure." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/a-distributed-computing-architecture-to-enable-advances-in-field-operations-and-management-of-distributed-infrastructure(a9181e99-adf3-47cb-93e1-89d267219e50).html.
Повний текст джерелаАнотація:
Distributed infrastructures (e.g., water networks and electric Grids) are difficult to manage due to their scale, lack of accessibility, complexity, ageing and uncertainties in knowledge of their structure. In addition they are subject to loads that can be highly variable and unpredictable and to accidental events such as component failure, leakage and malicious tampering. To support in-field operations and central management of these infrastructures, the availability of consistent and up-to-date knowledge about the current state of the network and how it would respond to planned interventions is argued to be highly desirable. However, at present, large-scale infrastructures are “data rich but knowledge poor”. Data, algorithms and tools for network analysis are improving but there is a need to integrate them to support more directly engineering operations. Current ICT solutions are mainly based on specialized, monolithic and heavyweight software packages that restrict the dissemination of dynamic information and its appropriate and timely presentation particularly to field engineers who operate in a resource constrained and less reliable environments. This thesis proposes a solution to these problems by recognizing that current monolithic ICT solutions for infrastructure management seek to meet the requirements of different human roles and operating environments (defined in this work as field and central sides). It proposes an architectural approach to providing dynamic, predictive, user-centric, device and platform independent access to consistent and up-to-date knowledge. This architecture integrates the components required to implement the functionalities of data gathering, data storage, simulation modelling, and information visualization and analysis. These components are tightly coupled in current implementations of software for analysing the behaviour of networks. The architectural approach, by contrast, requires they be kept as separate as possible and interact only when required using common and standard protocols. The thesis particularly concentrates on engineering practices in clean water distribution networks but the methods are applicable to other structural networks, for example, the electricity Grid. A prototype implementation is provided that establishes a dynamic hydraulic simulation model and enables the model to be queried via remote access in a device and platform independent manner.This thesis provides an extensive evaluation comparing the architecture driven approach with current approaches, to substantiate the above claims. This evaluation is conducted by the use of benchmarks that are currently published and accepted in the water engineering community. To facilitate this evaluation, a working prototype of the whole architecture has been developed and is made available under an open source licence.
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Marinho, Romário Pereira. "Reconfiguração de sistemas de distribuição de energia elétrica utilizando metodologias multipartida e busca tabu." Universidade Federal de Goiás, 2017. http://repositorio.bc.ufg.br/tede/handle/tede/8158.
Повний текст джерелаАнотація:
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Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
The purpose of this work is the solution of the distribution network problem to minimize active power losses using meta-heuristics based on multistart methodology and tabu search. The initialization of both methodologies will be done by solving a power flow for weakly meshed systems whose apparent power will be used by Prim’s algorithm as the weight, which will generate good initial radial topologies. The local searchs implemented are through brach exchanges that aim to improve the solution. The solutions are obtained by programming algorithms implemented in C++ language, which aim to minimize the losses in the distribution feeders. This dissertation is the result of efforts made in the initial stages of the CELG D’s Research and Development (R&D) project, ANEEL’s code PD-6072-0302 / 2015. Therefore, it is one of the project’s by-products entitled: " Sistema de Apoio à Decisão para Restauração de Redes de Distribuição de Energia Elétrica Considerando Curvas de Carga dos Transformadores das Subestações
O objetivo deste trabalho é resolver o Problema de Reconfiguração de Sistemas de Distribuição de Energia Elétrica com foco na minimização das perdas elétricas do sistema através das metodologias metaheurísticas Multipartida e Busca Tabu. A inicialização de ambas metodologias dar-se-á através da resolução de um fluxo de potência para sistemas fracamente malhados cujas potências aparentes resultantes serão utilizadas como pesos ideais no Algoritmo de Prim, o qual gerará topologias iniciais radiais de boa qualidade. As buscas locais adotadas através das trocas ramos visam melhorar a solução inicial obtida. Soluções de reconfiguração de redes elétricas de 14, 33, 84, 136 e 417 nós são obtidas através da programação de algoritmos implementados em linguagem C++, as quais têm como objetivo minimizar as perdas nos alimentadores de distribuição. Esta dissertação é resultado de esforços realizados nas etapas iniciais do projeto de Pesquisa e Desenvolvimento (P&D) da CELG D, código ANEEL PD-6072- 0302/2015. Portanto, constitui-se em um dos subprodutos do projeto intitulado: “Sistema de Apoio à Decisão para Restauração de Redes de Distribuição de Energia Elétrica Considerando Curvas de Carga dos Transformadores das Subestações”.
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Bernát, Jan. "Ustálený chod a zkratové poměry v síti 110 kV E.ON při můstkovém provozu transformátorů T402 a T403 v transformovně 400/110 kV Sokolnice." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220944.
Повний текст джерелаАнотація:
The master’s thesis deals with a calculation of steady state and short-circuit conditions in a 110 kV system during a bridge operation of transformers in a Sokolnice substation. The theoretical part of the thesis deals with a calculation of steady state of a system using Newton’s iterative method, it investigates short-circuits – their timing, distinctive values and a method of their calculation. In the practical part the 100 kV grid supplied from Sokolnice substation is described. The main goal of the thesis is a comparation of two basic wirings: bridge operation of T202 and T203 transformers (contemporarily in service) and bridge operation of T402 and T403 (in service after 2017). These two wirings were controlled even during one state of emergency during which the Sokolnice substation will be affected by an outage of one busbar. Voltage conditions, loading of power line and transformers and overall power balance were controlled. Short-circuit conditions were also calculated and short-circuit resistance of particular substations was inspected. In the conclusion technical measures needed to ensure smooth bridge operation of convertors T402 and T403.
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Dossa, Clebio Gavioli. "CoreLB: uma proposta de balanceamento de carga na rede com Openflow e SNMP." Universidade do Vale do Rio dos Sinos, 2016. http://www.repositorio.jesuita.org.br/handle/UNISINOS/5895.
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Atualmente, muitos serviços distribuem a carga entre diversos nós computacionais direcionando as conexões com alguma estratégia de balanceamento para divisão da carga. O advento do uso de redes definidas por software (SDN) está mudando paradigmas da administração de redes, absorvendo serviços especializados, automatizando processos e gerando inteligência para regras estáticas com uma grande variedade de opções de implementação. O balanceamento de carga é um dos serviços especializados que pode usufruir dos conceitos de SDN, sem definições e processos estáticos como ocorre muitas vezes nos atuais modelos usados de balanceamento de carga. A definição dos protocolos que suportam SDN usualmente permitem soluções alternativas e eficientes para este problema, desta forma, neste trabalho, é apresentada uma proposta de metodologia para balanceamento de carga entre distintos servidores de um pool com a troca do destino de tráfego realizada pela rede. Esta solução é chamada Core-based load balance (CoreLB), pois o serviço especializado de balanceamento de carga é realizado pela rede onde a administração de pacotes é nativamente realizada. A metodologia faz uso do protocolo SNMP para análise de recursos dos servidores com o objetivo de avaliar a situação de carga de cada nó computacional e de estatísticas de consumo de rede através do protocolo OpenFlow. Este trabalho avaliou o balanceamento de carga em serviços Web e a união de estatísticas de rede e da carga dos servidores, para a tomada de decisão de balanceamento, mostra-se uma metodologia eficiente e com melhores tempos de resposta ao usuário comparado com outras metodologias de avaliadas. Também melhorou a distribuição de consumo de recursos entre os servidores.
Currently, most services balance the load between distinct hosts forwarding connections with a load balance strategy in front. Usually, a dedicated appliance is responsible to performthe balance and may be a fault point and become expensive. The new concepts of computer network architecture with Software-Defined Networking (SND) are changing the network management, absorving specialist services, automating process and building intelligence to statics rules with loads of delivery options. The load balance is a specialized service that can enjoy in a positive way of SDN concepts, with low costs, in a flexible way as per the process needs instead of a plastered process definitions that occurs in many actual models. The OpenFlow protocol definition allow us to use a new solution to address this issue. This work shows a load balance purpose between distinct hosts with the destination change of connections made by the network core. It calls Core-based load balance (CoreLB) because the specialized load balance service move to the network core where the package forwarding is naturally made. This solution intend to use the SNMP protocol to analyse the hosts resources to evaluate server’s load. Using the network forwarding statistics and OS load informations, an efficient solution of load balance, the metodology proved to be efficient with better users’ response times average of 19% than no balanced scenario as well as around 9% better than others load balance strategies and a properly balance consumption of resources from hosts side. This process can be inhered in distinct models, however, this research intend to evaluate Web Services.
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Cardona, Natalia Patiño [UNESP]. "Reconfiguração de sistemas de distribuição de energia elétrica utilizando uma metodologia multipartida." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/136281.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este trabalho apresenta uma proposta baseada na metodologia multipartida para a resolução do Problema de Reconfiguração de Sistemas de Distribuição de Energia Elétrica, de natureza combinatória e modelado como um problema de Programação Não Linear Inteiro Misto. O objetivo principal deste trabalho é encontrar a topologia radial ótima para minimizar as perdas ativas dos sistemas de distribuição, e para isso é preciso, primeiramente, a resolução de um problema de fluxo de potência para sistemas fracamente malhados onde é calculada a potência aparente do sistema, a qual vai ser utilizada pelo algoritmo de Prim como o peso para a geração das soluções iniciais radiais de boa qualidade. Para implementar a metodologia proposta deve-se desenvolver também um algoritmo de fluxo de potência radial, utilizado para calcular tanto as perdas ativas do sistema (função objetivo do problema), como para verificar a factibilidade das propostas de solução. Nesta primeira etapa é feita uma variação aleatória dos pesos dos ramos, e são resolvidos tantos problemas de fluxo de potência radial quanto soluções aleatórias obtidas, para encontrar soluções de boa qualidade próximas ao ótimo. Finalmente, é feita uma busca local através da troca de ramos como tentativa para encontrar a solução ótima. As soluções obtidas pela metodologia proposta são obtidas através da programação de algoritmos implementados em linguagem C++. Os resultados obtidos mostram a eficiência da aplicação da metodologia, estes resultados foram comparados com os existentes na literatura e os obtidos pela resolução de um modelo de otimização resolvido com o solver comercial CPLEX.
This work presents a proposal based on multi-start methodology for the solution of the distribution network reconfiguration problem, of combinatorial nature and modeled as a mixed-integer nonlinear programming problem. The main objective of this work is to find the optimal radial topology to minimize active power losses in distribution systems. This requires, at first, the resolution of a power flow problem for weakly meshed systems where the apparent power of the system is calculated, which will be used by the Prim algorithm as the weight for generating the radial initial good quality solution. To implement the proposed methodology is also developed a radial power flow algorithm, used to calculate both the active system losses (objective function of the problem) and to verify the feasibility of the proposed solutions. In this first stage is made a random variation of the weights of branches, and there are solved as many radial power flows as random solutions obtained, to find good quality solutions close to optimal. Finally, a local search is made by doing an exchange of branches as an attempt to find the optimal solution. The solutions obtained by the proposed method are acquired by programming algorithms implemented in C ++ language. The results show the effectiveness of the application of the methodology. These results were compared with those in the literature and those obtained by solving an optimization model solved by the commercial solver CPLEX.
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Cardona, Natalia Patiño. "Reconfiguração de sistemas de distribuição de energia elétrica utilizando uma metodologia multipartida /." Ilha Solteira, 2016. http://hdl.handle.net/11449/136281.
Повний текст джерелаАнотація:
Orientador: Rubén Augusto Romero LázaroResumo: Este trabalho apresenta uma proposta baseada na metodologia multipartida para a resolução do Problema de Reconfiguração de Sistemas de Distribuição de Energia Elétrica, de natureza combinatória e modelado como um problema de Programação Não Linear Inteiro Misto. O objetivo principal deste trabalho é encontrar a topologia radial ótima para minimizar as perdas ativas dos sistemas de distribuição, e para isso é preciso, primeiramente, a resolução de um problema de fluxo de potência para sistemas fracamente malhados onde é calculada a potência aparente do sistema, a qual vai ser utilizada pelo algoritmo de Prim como o peso para a geração das soluções iniciais radiais de boa qualidade. Para implementar a metodologia proposta deve-se desenvolver também um algoritmo de fluxo de potência radial, utilizado para calcular tanto as perdas ativas do sistema (função objetivo do problema), como para verificar a factibilidade das propostas de solução. Nesta primeira etapa é feita uma variação aleatória dos pesos dos ramos, e são resolvidos tantos problemas de fluxo de potência radial quanto soluções aleatórias obtidas, para encontrar soluções de boa qualidade próximas ao ótimo. Finalmente, é feita uma busca local através da troca de ramos como tentativa para encontrar a solução ótima. As soluções obtidas pela metodologia proposta são obtidas através da programação de algoritmos implementados em linguagem C++. Os resultados obtidos mostram a eficiência da aplicação da metodologia, estes resul... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This work presents a proposal based on multi-start methodology for the solution of the distribution network reconfiguration problem, of combinatorial nature and modeled as a mixed-integer nonlinear programming problem. The main objective of this work is to find the optimal radial topology to minimize active power losses in distribution systems. This requires, at first, the resolution of a power flow problem for weakly meshed systems where the apparent power of the system is calculated, which will be used by the Prim algorithm as the weight for generating the radial initial good quality solution. To implement the proposed methodology is also developed a radial power flow algorithm, used to calculate both the active system losses (objective function of the problem) and to verify the feasibility of the proposed solutions. In this first stage is made a random variation of the weights of branches, and there are solved as many radial power flows as random solutions obtained, to find good quality solutions close to optimal. Finally, a local search is made by doing an exchange of branches as an attempt to find the optimal solution. The solutions obtained by the proposed method are acquired by programming algorithms implemented in C ++ language. The results show the effectiveness of the application of the methodology. These results were compared with those in the literature and those obtained by solving an optimization model solved by the commercial solver CPLEX.
Mestre
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Júnior, Alberto de Medeiros. "Sistemas integrados de gestão: proposta para um procedimento de decisão multicritérios para avaliação estratégica." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3136/tde-02062008-142434/.
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Os Sistemas Integrados de Gestão, também conhecidos como ERP (Enterprise Re-source Planning), vem tendo ampla utilização nas organizações a partir dos anos 90. Por exigir um investimento de elevado valor financeiro para a sua implantação, os responsáveis pela sua aquisição devem tomar cuidados especiais, uma vez que os seus resultados positivos ou negativos somente surgem após longo período de im-plantação, às vezes após muitos anos. Sendo um problema complexo, repleto de incertezas e riscos, os decisores tomam muito de seu tempo para analisar os diver-sos critérios e funcionalidades das ofertas de sistemas recebidas. A tese objetiva apresentar um procedimento que possibilite às empresas, em particular as de pe-queno e médio porte, um procedimento que as permita analisar quando do interesse da aquisição de um ERP, qual das ofertas disponíveis estará mais adequada às su-as necessidades de negócio, baseado em um método multicritérios de apoio à deci-são. A revisão da literatura analisa os Sistemas de Informação (SI) informatizados e os principais papéis desempenhados por eles: apoio às operações, apoio à vanta-gem competitiva e apoio à decisão. A seleção das ofertas propostas foi efetuada uti-lizando o método de Estudo de Casos múltiplos em empresas que adquiriram esses sistemas,ghy utilizando o ANP (Analytic Network Process) como instrumento de pesquisa. Para se estabelecer uma classificação dos critérios utilizados na análise foi utilizada a Técnica Delphi, a qual foi realizada junto a especialistas em Tecnologia de Informação. O resultado obtido pelo Estudo de Casos mostrou que o procedimen-to proposto é válido e pode ser utilizado por empresas de todos os portes.The use of Integrated Management Systems, also known as ERP (Enterprise Re-source Planning), are widely accepted by organizations since beginning of the ni-neties. As its implementation means a high financial value investment, the respon-sible team for its acquisition has to take special cares, once their positive or nega-tive results will appear only after long implementation period, often after many years. As it is a complex decision problem, evolving uncertainties and risks, the decision agents spend a lot of time to analyze the several criteria and functional-ities from received offers. This thesis presents a proposal which makes possible the companies, particularly those of small or medium sizes, which allows to analyze during the ERP acquisition phase, the available offers more adapted to their business requirements, based on a multi-criteria support decision method. The literature revision analyzes the computerized Information Systems (IS) and the main roles carried out by them: operations support, competitive advantage support and decision support. In order to define the criteria set used in the multi-criteria analysis, the Delphi Method was used and it was answered by Information Technology experts. These criteria was used to classify the ERP\'s offers using the multiple cases study using ANP (Analytic Network Process) as research tool.. The results obtained by case study in four companies were used to validate several propositions.
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FONTANA, Marcele Elisa. "Modelo de setorização para manobra em rede de distribuição de água baseado nas características das unidades consumidoras." Universidade Federal de Pernambuco, 2012. https://repositorio.ufpe.br/handle/123456789/18962.
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Devido ao envelhecimento e depreciação dos componentes de uma rede de distribuição de água é comum ocorrem vazamentos e rupturas na rede, ocasionando perdas e podendo acarretar a contaminação da água e descontinuidade no seu fornecimento pela interrupção do abastecimento de água durante a reparação da infraestrutura, bem como a redução da água disponível no sistema, gerando a insatisfação dos seus usuários. Nestes casos, a setorização da rede torna mais fácil qualquer atividade de manutenção, além de atingir um menor número de unidades de consumidoras pela interrupção do abastecimento. Porém, além do elevado custo da alocação de válvulas de fechamento, as Normas Brasileiras sobre setorização das redes dizem respeito apenas a questões técnicas que devem ser obedecidas pelos setores de manobra. Portanto, um modelo de setorização de manobra que leva em consideração as características das unidades consumidoras é proposto. Com ele pretende-se uma setorização que respeite as restrições previstas por lei, busque a maximização dos benefícios gerados pela setorização às unidades consumidoras e a minimização do número de válvulas de fechamento necessárias, ou seja, dos custos. Para medir o impacto da falta de água é gerado um índice de priorização que agrega as características das unidades consumidoras por meio de um método de agregação multicritério, o SMARTER. As simulações realizadas mostram que apenas a alocação inicial das válvulas pela NBR 12218/94 não garante a maximização dos benefícios gerados pela setorização da rede aos usuários. Neste caso, com o modelo proposto pode-se encontrar soluções melhores.
Due to aging and depreciation of the water distribution network components, leaks and ruptures are common on the water network. These cause the water loss, sometimes the water contamination and the discontinuity in water supply, due the supply interruption during the infrastructure repair, as well as reduction of available water in the system, causing the users' dissatisfaction. In these cases, network segmentation makes any maintenance activity easy and this achieves a smaller number of consuming units by water supply interruption. However, besides the high valves allocation cost, the Brazilian norms about network segmentation relate only technical issues that must be followed. Therefore, a network segmentation model, which takes into account the characteristics of consumer units, is proposed. It aims a network segmentation which complied the restrictions provided by law, it seeks the maximum benefit to consumer units, generated by the segmentation, and it seeks minimum number of valves required, i.e., the costs. To measure the impact on water lack is generated a priority index which adds the characteristics of consuming units via a multicriteria aggregation method, the SMARTER. The simulations realized showed that only the initial valves allocation, by the NBR 12218/94, does not guarantee the maximization of the benefits generated by the network segmentation for users. In this case, with the proposed model, better solutions can be found.
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Klobučník, Jozef. "Ustálený chod a zkratové poměry v síti 110 kV E.ON při můstkovém provozu transformátorů T401 a T402 v transformovně 400/110 kV Čebín." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220685.
Повний текст джерелаАнотація:
Master’s thesis deals with computation of steady state and short-circuit conditions in the 110 kV distribution network in the nodal area of Čebín. Computations are done during independent operation and bridge operation of transformers T401, T402 in transformation station Čebín with proposed configuration of network. Additional computations of steady state during specific operating conditions such as (T401 outage, disconnection of line 5553) were done during network operation in bridge operation of T401, T402. Voltage conditions in substations, load of 110kV lines and 400/110 kV, 110/HV kV transformers are evaluated based on the computations of steady state. Short-circuit resistance of substations is being evaluated with the aid of calculations of short-circuit conditions. There is a comparison and processed results of computations during independent operation, bridge operation, special operational states and proposed technical measures of operation in bridge operation in the end of the thesis. Theoretical part of the master’s thesis deals with the description of 110 kV distribution networks, theory of calculation of the steady state of electric system with the aid of Newton iterative method a calculation of single-phase and three-phase short-circuit current with the aid of method of symmetrical components.
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Kalalas, Charalampos. "Cellular networks for smart grid communication." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/620760.
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The next-generation electric power system, known as smart grid, relies on a robust and reliable underlying communication infrastructure to improve the efficiency of electricity distribution. Cellular networks, e.g., LTE/LTE-A systems, appear as a promising technology to facilitate the smart grid evolution. Their inherent performance characteristics and well-established ecosystem could potentially unlock unprecedented use cases, enabling real-time and autonomous distribution grid operations. However, cellular technology was not originally intended for smart grid communication, associated with highly-reliable message exchange and massive device connectivity requirements. The fundamental differences between smart grid and human-type communication challenge the classical design of cellular networks and introduce important research questions that have not been sufficiently addressed so far. Motivated by these challenges, this doctoral thesis investigates novel radio access network (RAN) design principles and performance analysis for the seamless integration of smart grid traffic in future cellular networks.
Specifically, we focus on addressing the fundamental RAN problems of network scalability in massive smart grid deployments and radio resource management for smart grid and human-type traffic. The main objective of the thesis lies on the design, analysis and performance evaluation of RAN mechanisms that would render cellular networks the key enabler for emerging smart grid applications.
The first part of the thesis addresses the radio access limitations in LTE-based networks for reliable and scalable smart grid communication. We first identify the congestion problem in LTE random access that arises in large-scale smart grid deployments. To overcome this, a novel random access mechanism is proposed that can efficiently support real-time distribution automation services with negligible impact on the background traffic. Motivated by the stringent reliability requirements of various smart grid operations, we then develop an analytical model of the LTE random access procedure that allows us to assess the performance of event-based monitoring traffic under various load conditions and network configurations. We further extend our analysis to include the relation between the cell size and the availability of orthogonal random access resources and we identify an additional challenge for reliable smart grid connectivity. To this end, we devise an interference- and load-aware cell planning mechanism that enhances reliability in substation automation services. Finally, we couple the problem of state estimation in wide-area monitoring systems with the reliability challenges in information acquisition. Using our developed analytical framework, we quantify the impact of imperfect communication reliability in the state estimation accuracy and we provide useful insights for the design of reliability-aware state estimators.
The second part of the thesis builds on the previous one and focuses on the RAN problem of resource scheduling and sharing for smart grid and human-type traffic. We introduce a novel scheduler that achieves low latency for distribution automation traffic while resource allocation is performed in a way that keeps the degradation of cellular users at a minimum level. In addition, we investigate the benefits of Device-to-Device (D2D) transmission mode for event-based message exchange in substation automation scenarios. We design a joint mode selection and resource allocation mechanism which results in higher data rates with respect to the conventional transmission mode via the base station. An orthogonal resource partition scheme between cellular and D2D links is further proposed to prevent the underutilization of the scarce cellular spectrum.
The research findings of this thesis aim to deliver novel solutions to important RAN performance issues that arise when cellular networks support smart grid communication.Las redes celulares, p.e., los sistemas LTE/LTE-A, aparecen como una tecnología prometedora para facilitar la evolución de la próxima generación del sistema eléctrico de potencia, conocido como smart grid (SG). Sin embargo, la tecnología celular no fue pensada originalmente para las comunicaciones en la SG, asociadas con el intercambio fiable de mensajes y con requisitos de conectividad de un número masivo de dispositivos. Las diferencias fundamentales entre las comunicaciones en la SG y la comunicación de tipo humano desafían el diseño clásico de las redes celulares e introducen importantes cuestiones de investigación que hasta ahora no se han abordado suficientemente. Motivada por estos retos, esta tesis doctoral investiga los principios de diseño y analiza el rendimiento de una nueva red de acceso radio (RAN) que permita una integración perfecta del tráfico de la SG en las redes celulares futuras. Nos centramos en los problemas fundamentales de escalabilidad de la RAN en despliegues de SG masivos, y en la gestión de los recursos radio para la integración del tráfico de la SG con el tráfico de tipo humano. El objetivo principal de la tesis consiste en el diseño, el análisis y la evaluación del rendimiento de los mecanismos de las RAN que convertirán a las redes celulares en el elemento clave para las aplicaciones emergentes de las SGs. La primera parte de la tesis aborda las limitaciones del acceso radio en redes LTE para la comunicación fiable y escalable en SGs. En primer lugar, identificamos el problema de congestión en el acceso aleatorio de LTE que aparece en los despliegues de SGs a gran escala. Para superar este problema, se propone un nuevo mecanismo de acceso aleatorio que permite soportar de forma eficiente los servicios de automatización de la distribución eléctrica en tiempo real, con un impacto insignificante en el tráfico de fondo. Motivados por los estrictos requisitos de fiabilidad de las diversas operaciones en la SG, desarrollamos un modelo analítico del procedimiento de acceso aleatorio de LTE que nos permite evaluar el rendimiento del tráfico de monitorización de la red eléctrica basado en eventos bajo diversas condiciones de carga y configuraciones de red. Además, ampliamos nuestro análisis para incluir la relación entre el tamaño de celda y la disponibilidad de recursos de acceso aleatorio ortogonales, e identificamos un reto adicional para la conectividad fiable en la SG. Con este fin, diseñamos un mecanismo de planificación celular que tiene en cuenta las interferencias y la carga de la red, y que mejora la fiabilidad en los servicios de automatización de las subestaciones eléctricas. Finalmente, combinamos el problema de la estimación de estado en sistemas de monitorización de redes eléctricas de área amplia con los retos de fiabilidad en la adquisición de la información. Utilizando el modelo analítico desarrollado, cuantificamos el impacto de la baja fiabilidad en las comunicaciones sobre la precisión de la estimación de estado. La segunda parte de la tesis se centra en el problema de scheduling y compartición de recursos en la RAN para el tráfico de SG y el tráfico de tipo humano. Presentamos un nuevo scheduler que proporciona baja latencia para el tráfico de automatización de la distribución eléctrica, mientras que la asignación de recursos se realiza de un modo que mantiene la degradación de los usuarios celulares en un nivel mínimo. Además, investigamos los beneficios del modo de transmisión Device-to-Device (D2D) en el intercambio de mensajes basados en eventos en escenarios de automatización de subestaciones eléctricas. Diseñamos un mecanismo conjunto de asignación de recursos y selección de modo que da como resultado tasas de datos más elevadas con respecto al modo de transmisión convencional a través de la estación base. Finalmente, se propone un esquema de partición de recursos ortogonales entre enlaces celulares y D2
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Fouathia, Ouahab. "Stratégie de maintenance centrée sur la fiabilité dans les réseaux électriques de haute tension." Doctoral thesis, Universite Libre de Bruxelles, 2005. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211003.
Повний текст джерелаАнотація:
Aujourd’hui les réseaux électriques sont exploités dans un marché dérégulé. Les gestionnaires des réseaux électriques sont tenus d’assurer un certain nombre de critères de fiabilité et de continuité du service, tout en minimisant le coût total consacré aux efforts effectués pour maintenir la fiabilité des installations. Il s’agit de trouver une stratégie, qui répond à plusieurs exigences, comme :le coût, les performances, la législation, les exigences du régulateur, etc. Cependant, le processus de prise de décision est subjectif, car chaque participant ramène sa contribution sur base de sa propre expérience. Bien que ce processus permette de trouver la « meilleure » stratégie, cette dernière n’est pas forcément la stratégie « optimale ». Ce compromis technico-économique a sensibilisé les gestionnaires des réseaux électriques à la nécessité d’un recours à des outils d’aide à la décision, qui doivent se baser sur des nouvelles approches quantitatives et une modélisation plus proches de la réalité physique.Cette thèse rentre dans le cadre d’un projet de recherche lancé par ELIA, et dénommé COMPRIMa (Cost-Optimization Models for the Planning of the Renewal, Inspection, and Maintenance of Belgian power system facilities). Ce projet vise à développer une méthodologie qui permet de modéliser une partie du réseau électrique de transport (par les réseaux de Petri stochastiques) et de simuler son comportement dynamique sur un horizon donné (simulation de Monte Carlo). L’évaluation des indices de fiabilité permet de comparer les différents scénarios qui tentent d’améliorer les performances de l’installation. L’approche proposée est basée sur la stratégie RCM (Reliability-Centered Maintenance).
La méthodologie développée dans cette thèse permet une modélisation plus réaliste du réseau qui tient compte, entre autres, des aspects suivants :
- La corrélation quantitative entre le processus de maintenance et le processus de vieillissement des composants (par un modèle d’âge virtuel) ;
- Les dépendances liées à l’aspect multi-composant du système, qui tient compte des modes de défaillance spécifiques des systèmes de protection ;
- L’aspect économique lié à la stratégie de maintenance (inspection, entretien, réparation, remplacement), aux coupures (programmées et forcées) et aux événements à risque (refus disjoncteur, perte d’un client, perte d’un jeu de barres, perte d’une sous-station, etc.).
Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished
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Vyčítal, Václav. "Ustálený chod a zkratové poměry v síti 110 kV E.ON napájené z transformovny Sokolnice." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221345.
Повний текст джерелаАнотація:
This thesis can be divided into five main parts. The first part deals with theoretical analysis of power flow calculation in power network during steady state condition. Load flow calculation is presented here as a linear and nonlinear problem. Newton iteration method is proposed for solving power flow as nonlinear problem. The second part of this thesis deals with the analysis of short-circuit calculation in accordance with valid International Standard IEC 60909. The equivalent voltage source method is adopted in case of the short-circuit calculation. For the calculation of unbalanced short-circuit currents, the symmetrical components method is also presented. The last three parts of this paper are focused on calculations of power flow and short-circuit conditions in power grid Sokolnice. So in the third part is the description of nodal area Sokolnice with its substations and the calculation of load flow and short-circuit conditions for two different power supply options. For each supply option is also considered an abnormal (fault) grid condition. (overall there are solved four different options) The fourth part of this thesis deals with the result analysis and also the results of different power supply options are compared. In the last part there are presented necessary technical improvements for fault-free operation of power grid Sokolnice based on the result of power flow and short-circuit conditions in that grid.
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Múdry, Peter. "Ustálený chod a zkratové poměry v síti 110 kV E.ON při paralelním provozu uzlových oblastí R Čebín a R Sokolnice." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220169.
Повний текст джерелаАнотація:
In the distribution network 110 kV of E.ON Company there are the nodal areas of Čebin substation and Sokolnice substation which are operated separately at the present time. There is one 400/110 kV transformer for each nodal area. In case of fault on one of these transformers or on busbar in which the set transformer is working, it comes to an outage of electric supply in the set nodal area. This problem has to be solved with help of the parallel operation of nodal areas of Čebín substation and Sokolnice substation. The main and also the practical task of this work is to design the bridge connection appropriate for parallel operation of nodal areas (supply transformers 400/110 kV). With help of a computing program there were made calculations of steady state and short-circuit conditions in distribution network 110 kV for separated and parallel operation of nodal areas. Voltage conditions, load of transformers (400/110 kV and 110/vn kV) and conditions on 110 kV lines are evaluated and controlled as the result of steady state calculations. Based on short-circuit conditions there is controlled the short-circuit resistance of the substations. Finally there are compared advantages and disadvantages of separated and parallel operations of nodal areas. If necessary, technical arrangements required for introduction of parallel operation of nodal areas of Čebín substation and Sokolnice substation will be designed. The theoretical part of the work deals with calculation of steady state with help of iterative methods, namely Newton´s and Gauss-Seidel methods. There are further described the method of calculating short-circuit currents, characteristic values and time behaviours of short-circuit current.
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Wang, Wen-Jing, and 王玟菁. "Integrated Resource Planning of Regional Distribution Network." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/01305946896651645130.
Повний текст джерелаАнотація:
碩士國立中山大學
電機工程學系研究所
103
Power system planner has to develop a suitable strategy to deal with the load growth. In the past, the system is reinforced by upgrading or installing new equipment. Due to environmental concerns, new technologies such as distributed generation (DG), demand side management (DSM), etc., have been developed and integrated into power grid. Integrated resource planning (IRP) exploits traditional and new strategies from both supply and demand sides. To relieve the pressure caused by the growing load, in this thesis, fuzzy inference scheme is used for load forecasting by considering economic and other factors as input variables. Electric vehicle changing demand is considered. The IRP problem is formulated as an optimization problem to include various system serving capacity enhancement options with least cost. The proposed regional distribution system planning approach is compared with the traditional approach. Study results have shown that IRP can meet the load growth with lower total cost and delay the system expansion requirements.
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Kuo, Yu-Chin, and 郭育志. "A multiple pattern matching method for resource-limited network devices." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/qf5262.
Повний текст джерелаАнотація:
碩士國立成功大學
資訊工程學系碩博士班
90
In the past years, due to the popularization of broadband/wireless communication technologies, many SOHO users now construct their Intranet with low-cost embedded network devices to connect to the Internet. These low-cost network devices have low-level CPU and more limitations on system resource (such as the computation power of CPU, memory, static storage, and so on) than traditional expansive network devices. How to save resource is important for these network devices when they are applied to solve the problems of content-based packet filtering and intrusion detection. In this paper, we show the problems of existing pattern matching methods when they are implemented in a resource-limited network device. We then propose a novel multiple pattern matching method that has better performance than traditional Aho-Corasick(AC) and Boyer-Moore Horspool (BMH) algorithms and uses less resource than Set-Wise Boyer-Moore Horspool algorithm. It adopts hash table to construct an extended Boyer-Moore Hospool approach for multiple pattern matching with Set-Exclusive Shift Table. The HASH-Link-List structure of the proposed approach will have less requirement of memory resource than other Multiple Pattern Matching algorithms. The Set-Exclusive Table also helps to reduce the times of matching. The proposed pattern-matching method has been applied to content-based packet filtering.
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Zeng, Xu-Hua, and 曾勖華. "User-Centric Software-Defined Network and Resource Virtualization for Digital Content Distribution." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/37q3j8.
Повний текст джерелаАнотація:
碩士國立高雄第一科技大學
電子工程系碩士班
105
The proposed system realizes Software Defined Network (SDN) and Network Function Virtualization (NFV) which are the essence of the fifth-generation (5G) mobile communication to achieve high performance computing and networking. Large amount of devices are surrounding our daily life. Massive devices simultaneously requesting services from a single server will certainly downgrade the network efficiency and consequently reduce the quality of service (QoS) and quality of experience (QoE). Taking the live streaming network architecture as an example, we see the main techniques are based on data center with centralized servers. The servers suffer from serious bandwidth shortage especially when large amount of users are requesting the live stream at the same time. The traditional solution to this problem is to increase investment deploying more physical apparatus and networks. In this thesis, we propose autonomous clustering technique where Device to Device Communication (D2D) enable each device, mobile or not, relaying digital contents and acting a virtual router to achieve the NFV purpose. This technique dramatically reduce the number of direct requests to the media and network control servers and devices shares multimedia contents from each other through the virtualized D2D communication. The proposed architecture comprises multiple heterogeneous network nodes, a video server, and an accounting server. All the nodes, including possible large servers, are capable of communicating with other. The clusters of nodes autonomously and dynamically organized. In a cluster, according to the accounting server’s information, each node discovers a preceding node that is able to provide the requesting service. Once the preceding node fails to provide the service at some moment, the discovering procedure is revoked. The hierarchy of the network topology is then defined by the discovery procedure and thus the SDN purpose is achieved. In the experiment, 50 PCs and three mobile device request 19201080 (HD) H.264 stream at the same time. The accounting server needs only 5KB/s for management message delivery while the media server requires only 4~6MB/s outgoing service bandwidth. Compared to traditional method, the proposed method saves 60~70% bandwidth.
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Chieochan, Surachai. "Network Coded Media Distribution in Infrastructure Wireless Mesh Networks." 2011. http://hdl.handle.net/1993/4954.
Повний текст джерелаАнотація:
Infrastructure wireless mesh networks (IWMNs) provide inexpensive deployment, flexible extension of wireless infrastructure, and easy access to the Internet. With multiple radios at each node, a capacity per node improves by transmitting over these radios simultaneously using orthogonal channels. However, without properly addressing the problem of channel assignment and routing for those nodes that form wireless infrastructures, the resulting network throughput and reliability are unlikely to meet the requirements of those highly demanding, media distribution applications. On a particular channel, poor resource allocation at a given access point/gateway of the underlying IWMN can amplify the problem even further. Motivated by these problems, we develop, based on the theory of network coding, a set of alternative solutions that addresses the above issues. We first introduce a sub-optimal solution to the joint problem of network coding, channel assignment and link scheduling for throughput optimization in the multi-channel multi-radio IWMN. We mathematically formulate the problem as a linear program, taking into account opportunistic overhearing, among other constraints. Based on this formulation, we develop a sub-optimal, auction-based algorithm for network throughput optimization. Simulation results reveal the effectiveness of our algorithm in exploiting multiple radios and channels while coping with fairness issues arising from auctions. The proposed solution also shows promising gains over traditional routing solutions. Our experimental results on an 802.11 testbed further confirm these results. The second part of this thesis then presents three AP/gateway-oriented solutions that address the link-level issues related to radio resource allocation at a particular AP/gateway node of the underlying IWMN, which operates on a given channel serving a set of wireless clients. Since the last-hop wireless link is normally a bottleneck of the IWMN, the key idea underlying all the proposed solutions is to use a version of network coding at the bottlenecked AP/gateway. We use Markov chains and the probability theory to derive several performance measures related to media distribution for both uplink and downlink applications. Via extensive simulations, we show the promising delay and reliability gains of the network-coding based schemes over the traditional schemes without network coding.
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LIN, HONG-YE, and 林宏曄. "A Deep Learning-Based Ensemble Method for Locating Fault in Distribution Network." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3t78rp.
Повний текст джерелаАнотація:
碩士國立中正大學
電機工程研究所
107
With the increase of renewable energy sources, the need for more stable power supply and the increasing complexity of the distribution network, locating the faults becomes a challenging task. In addition, the feeders in a distribution network are subject to different disturbances, resulting from short circuit conditions such as the severe weather conditions, human accidents, and equipment malfunction. Quickly knowing the location of the fault is great importance for power companies. This thesis proposes a transient detection-based approach for locating short-circuit faults in distribution systems. By performing spectrum analysis through fast Fourier transform and using a variety of supervised learning techniques to classify fault areas via frequency spectrum features, one can predict fault distances in fault areas. The fault location is identified by using the ensemble learning method to improve the accuracy. Test results show that the proposed method can effectively locate the fault location.
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Ke, Ting-Yu, and 柯亭宇. "Urban Green Resource Distribution and Eco-Green Network Structure －Taichung City as Case Study." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/22891858399221464183.
Повний текст джерелаАнотація:
碩士朝陽科技大學
建築及都市設計研究所
99
Sustainable development of eco-city has become the current trend in the world. But the development of city patterns will cause change in use of pattern of green space in the city. When the rapid growth of population and city development under the unrestricted and spreaded, it will reduce the survival of biological space. The city is facing a shortage of green space, and can not effectively promote a difficult position of the extent of green coverage. Therefore, to construct a vision of urban ecological green network, green resources distribution must be planning and improve efficiently in provided from the city. After reviewing the literature, the study finishing many of the key factors of construction of eco-green network. Through the Fuzzy Delphi Method and Analytic Network Process Method to practice the procedure of the two-stage questionaire survey into experts’ opinion. Attempt to structure a set of the evaluation indicator system of city ecological green network. The empirical investigation was carried out in Taichung City, analysis by Geographic Information Systems (GIS) combine with overlayed related-maps of remote sensing technology to obtain conclusions. Then to give propose and improvement for the suitable location of constructing urban ecological green network. In the course of study, there are 23 assessment factor projects were obtained. Results of the study revealed that green resources in the city should be created as a function of the environmental network nodes, and could also increase network nodes by creating more green resources. Then to link or enhance existing green resources where the region distribute in the city, promote the formation of ecological networks. Besides, it can also create capacity of ecological stepping-stone by greening roofs, and enhance the link degree of ecological networks. To achieve the maximum benefit of eco-green network in the city.
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Lin, Liang-Chih, and 林良枝. "Using Resource Sharing Method to Construct Distribution Process Template for Smalland Medium Size Enterprise." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/43041536874444491346.
Повний текст джерелаАнотація:
碩士國立臺北科技大學
生產系統工程與管理研究所
88
ABSTRACT When facing the popularity of internet and the challenge of computerized information and owing to the limitation of organization, human resources and capital, the middle and small sized enterprises in Taiwan raise their whole quality and elevate their customer satisfaction to gain their superiority of competition through the organization and business process reengineering, strategic alliance and cooperation with other companies. To come up with the coming of electronic commercial era, they take the integrated idea of “Resource Sharing,” and strengthen logistics management to elevate their ability of competition. In addition, only by reorganizing the material requirement planning (MRP), manufacturing resource planning (MRP II), enterprises resource planning (ERP) and supply chain management (SCM) can enterprises solve the problems of logistics management. Through the interviews with the family electric industries and based on the commercial process charts in architecture of integrated information system (ARIS), this research try to establish the operation flow model of distributing management in supply chain system. We expect to elevate the superiority of cooperation among the middle and small sized enterprises, create the richness of business, shorten the time and the failure rate of resource incorporation system, and decrease the integrated time among enterprises. At last, we hope to offer enterprises the operation examples of process flow to be their criteria when valuing business activities so as to set their blueprints of resource strategy and to reach the goal of raising their capability of competition.
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Carvalho, Micael Luís Morais. "An Overview of Methods for Control of Flexible Resources." Master's thesis, 2016. http://hdl.handle.net/10316/81592.
Повний текст джерелаАнотація:
Dissertação de Mestrado Integrado em Engenharia Electrotécnica e de Computadores apresentada à Faculdade de Ciências e TecnologiaA recurrent subject related with the electrical grids in the last years, is the necessity to adopt sustainable energy policies. Due to massive raises in the greenhouse gas emissions, the planet Earth has suffered serious consequences. The European Union, trying to reduce this emissions, has played an important role, with the financing of enormous projects with the aim to improve the Power Quality (PQ) and at the same time, reduce the greenhouse gas emissions, for a better ambient and a better service. Two of those projects are the Increase and the Story. The principal ambition of these two projects is to study and develop new controls to permit a better penetration and at the same time, a better control of the distributed renewable energy sources (DRES) in the distribution network. In the case of the Story, the aim is to use storage technologies to this end.Distribution networks are recently becoming a target of this intensive research. The increasing penetration of the distributed renewable energy sources, such as photovoltaic panels (PV) and wind generation, as well as flexible load consumption units, have influence the network operation. Normally, the Distribution System Operator (DSO) would strive to reinforce the grid through additional investments to deal with this issues. This investment can cause technical problems in the grid, although, this new development can also provide a potential source of flexibility from the network users and thus a desirable source of solutions for the grid operations. With appropriate approaches to conjure and to use this flexibility, the DSO can increase hosting capacity with the existing grid infrastructure, deferring grid reinforcement investments.The ambition of my master thesis is, in collaboration with the Laboratory of Energy Policy from the University of Ljubljana, to study the effects of the different types of controls in a distribution network, to allow the injection of power from DRES, keeping all the network parameters inside the regulated levels, allowing this flexibility aforementioned. For that, was used the Increase simulation platform to simulate a Rural Network with the parameters and characteristics close to a real one.This is a first part in this two European projects, with this results, they will be used for further investigation. Is essential to deliver new tools and methods to the DSO to allow a higher increase of distributed renewable energy sources in the network, because, with this inclusion will be a big step to a fossil independent networks.
Um assunto recorrente relacionado com as redes elétricas durante os últimos anos, é a necessidade de adotar politicas energeticamente sustentáveis. Devido ao enorme crescimento nas emissões de gases de estufa, o nosso planeta tem vindo a sofrer graves consequências.A União Europeia tem tido um papel importante no combate a este crescimento das emissões, com o financiamento de vários projetos com o fim de melhorar a qualidade de energia e ao mesmo tempo, reduzir as emissões dos gases de estufa, para um melhor ambiente e um serviço melhorado.Dois destes projetos são o Increase e o Story. A principal ambição destes dois projetos, é o estudo e o desenvolvimento de novos tipos de controlo, que permitam uma melhor penetração e ao mesmo tempo, um controlo improvado das distributed renewable energy sources (DRES) nas redes de distribuição elétricas. No caso do programa Story são usadas unidades de armazenamento para este fim.As redes de distribuição elétricas têm vindo a ser alvo de uma pesquisa intensiva. A penetração das DRES, como fotovoltaicas (PV) e energia eólica, bem como as cargas com consumo flexível, influenciam a operação das redes. Normalmente, o operador destas redes opta pela via do investimento para lidar com estes problemas, no entanto, este mesmo investimento pode provocar novos problemas técnicos na rede de energia. Com estes recentes desenvolvimentos, os consumidores podem vir a ser uma fonte potencial de flexibilidade para a rede, sendo uma solução desejável para os problemas na operação da rede.Com um apropriado uso desta flexibilidade, o DSO pode aumentar a capacidade da rede usando apenas a infraestrutura já instalada, evitando assim custos da instalação de novos equipamentos.Esta dissertação tem como ambição, numa colaboração com o Laboratory of Energy Policiy da Universidade de Ljubljana, estudar os efeitos de diferentes tipos de controlos numa rede de distribuição, para assim, permitir uma máxima injeção de energia das fontes renováveis, mantendo todos os parâmetros dentro dos valores regulados. Para isso, foi usada a plataforma de simulação do Increase para simular uma rede rural com parâmetros e características baseadas numa rede real.Este é uma primeira aproximação dos dois projetos acima referidos, sendo que estes resultados irão ser usados em investigações futuras. O desenvolvimento de novas ferramentas e métodos para o DSO permitir uma maior penetração de DRES na rede, é de elevada importância, pois com esta inclusão vai permitir uma maior independência dos combustíveis fósseis.
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Mokryani, Geev, A. Majumdar, and B. C. Pal. "A probabilistic method for the operation of three-phase unbalanced active distribution networks." 2016. http://hdl.handle.net/10454/7760.
Повний текст джерелаАнотація:
YesThis paper proposes a probabilistic multi-objective optimization method for the operation of three-phase distribution networks incorporating active network management (ANM) schemes including coordinated voltage control and adaptive power factor control. The proposed probabilistic method incorporates detailed modelling of three-phase distribution network components and considers different operational objectives. The method simultaneously minimizes the total energy losses of the lines from the point of view of distribution network operators (DNOs) and maximizes the energy generated by photovoltaic (PV) cells considering ANM schemes and network constraints. Uncertainties related to intermittent generation of PVs and load demands are modelled by probability density functions (PDFs). Monte Carlo simulation method is employed to use the generated PDFs. The problem is solved using ɛ-constraint approach and fuzzy satisfying method is used to select the best solution from the Pareto optimal set. The effectiveness of the proposed probabilistic method is demonstrated with IEEE 13- and 34- bus test feeders.
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Luo, Chi-Wen, and 羅啟文. "Design a Cross-layer Uplink Green Resource and Power Allocation Method over LTE-A Relay Network." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/47589910735269682055.
Повний текст джерелаАнотація:
碩士國立臺南大學
電機工程學系碩博士班
102
The Relay Node (RN) in Long-Term Evolution-Advanced (LTE-A) networks is used to enhance the coverage of high data rate and solve the coverage hole problem. However, for User Equipments (UEs), using a higher transmission rate means more energy consumption; especially they are operated by batteries. In this paper, on the premise of being compatible to the LTE-A resource allocation specification, we discuss how to allocate the uplink resource, mobile device uplink path, and uplink transmit power in an energy saving way over LTE-A relay networks, such that the battery life of the mobile device can be extended. The objective is to minimize the total energy consumption of UEs while guarantee the constraints of system radio resource, maximum transmission power, and each of their quality of service (QoS). We also prove that this uplink resource and power allocation problem to be NP-complete. Considering the very short scheduling period in LTE-A (the subframe length in LTE-A is only 1ms), we propose an efficient method to solve the uplink resource and power allocation problem. The complexity analysis shows that the time complexity of the proposed heuristics is O(n2). Simulation results show that our proposed algorithm can effectively reduce the energy consumption of UEs and guarantee users’ service quality.
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Siano, P., and Geev Mokryani. "Evaluating the Benefits of Optimal Allocation of Wind Turbines for Distribution Network Operators." 2015. http://hdl.handle.net/10454/9223.
Повний текст джерелаАнотація:
NoThis paper proposes a hybrid optimization method for optimal allocation of wind turbines (WTs) that combines a fast and elitist multiobjective genetic algorithm (MO-GA) and the market-based optimal power flow (OPF) to jointly minimize the total energy losses and maximize the net present value associated with the WT investment over a planning horizon. The method is conceived for distributed-generator-owning distribution network operators to find the optimal numbers and sizes of WTs among different potential combinations. MO-GA is used to select, among all the candidate buses, the optimal sites and sizes of WTs. A nondominated sorting GA II procedure is used for finding multiple Pareto-optimal solutions in a multiobjective optimization problem, while market-based OPF is used to simulate an electricity market session. The effectiveness of the method is demonstrated with an 84-bus 11.4-kV radial distribution system.
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Kollia, Varvara. "Electromagnetic modeling of the power distribution network in packaged integrated circuits using a hybrid extended segmentation method /." 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3337830.
Повний текст джерелаАнотація:
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008.Source: Dissertation Abstracts International, Volume: 69-11, Section: B, page: 7034. Adviser: Andreas C. Cangellaris. Includes bibliographical references (leaves 155-159) Available on microfilm from Pro Quest Information and Learning.
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"Efficient Routing and Resource Sharing Mechanisms for Hybrid Optical-Wireless Access Networks." Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.38457.
Повний текст джерелаАнотація:
abstract: The integration of passive optical networks (PONs) and wireless mesh networks (WMNs) into Fiber-Wireless (FiWi) networks has recently emerged as a promising strategy for
providing flexible network services at relative high transmission rates. This work investigates the effectiveness of localized routing that prioritizes transmissions over the local gateway to the optical network and avoids wireless packet transmissions in radio zones that do not contain the packet source or destination. Existing routing schemes for FiWi networks consider mainly hop-count and delay metrics over a flat WMN node topology and do not specifically prioritize the local network structure. The combination of clustered and localized routing (CluLoR) performs better in terms of throughput-delay compared to routing schemes that are based on minimum hop-count which do not consider traffic localization. Subsequently, this work also investigates the packet delays when relatively low-rate traffic that has traversed a wireless network is mixed with conventional high-rate PON-only traffic. A range of different FiWi network architectures with different dynamic bandwidth allocation (DBA) mechanisms is considered. The grouping of the optical network units (ONUs) in the double-phase polling (DPP) DBA mechanism in long-range (order of 100~Km) FiWi networks is closely examined, and a novel grouping by cycle length (GCL) strategy that achieves favorable packet delay performance is introduced. At the end, this work proposes a novel backhaul network architecture based on a Smart Gateway (Sm-GW) between the small cell base stations (e.g., LTE eNBs) and the conventional backhaul gateways, e.g., LTE Servicing/Packet Gateway (S/P-GW). The Sm-GW accommodates flexible number of small cells while reducing the infrastructure requirements at the S-GW of LTE backhaul. In contrast to existing methods, the proposed Sm-GW incorporates the scheduling mechanisms to achieve the network fairness while sharing the resources among all the connected small cells base stations.Dissertation/Thesis
Doctoral Dissertation Electrical Engineering 2016
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Tsai, Yung-Ta, and 蔡咏達. "Study of the two dimensional illumination distribution by using the Newton method and the back-propogation neural network." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/64014553117874355738.
Повний текст джерелаАнотація:
碩士國立高雄應用科技大學
電機工程系博碩士班
101
The main theme of this thesis is to design the control modal for the operation lamp to improve the operator comfortable and reduce human cost.The proposed Back-Propogated Algorithm(BP),The Advanced Newton Method improve the accuracy of illumination .The control modal of the operation lamp is firsted examined using the measured outputs in data.The accuracy of the control modal is comfirmed by the experiment.In order to make a comparison,we also introduce the curve fitting method and the basic back propogation method.Two kinds of paper, a white paper and a gray paper are vindicated to test the proformance.All the computer simulation results demonstrate that the proposed control modal can provide the accuracy predictIon of illumination among all the operation room under all surgery.