Dissertations / Theses on the topic 'Flexible distributions'
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Haynes, Michele Ann. "Flexible distributions and statistical models in ranking and selection procedures with applications." Thesis, Queensland University of Technology, 1998.
Find full textCarlsson, Daniel, and Johan Dvärsäter. "Flexibel Fysisk Distribution." Thesis, Linköping University, Department of Management and Economics, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-857.
Full textBakgrund: Vi anser att en framtida utmaning är att bygga in en flexibilitet i den fysiska distributionen. Detta innebär att ett detaljhandelsföretag skall ha möjlighet att växla mellan att stundtals distribuera en och samma produkt via centrallager och stundtals direkt från producent till varuhus i förädlingskedjan, en flexibel fysisk distribution.
Syfte: Syftet är att utröna förutsättningar för och konsekvenser av en flexibel fysisk distribution för de olika aktörerna i en förädlingskedja, i vilken detaljhandelsföretaget besitter en påtaglig maktposition.
Genomförande: Empirisk data har samlats in genom en fallstudie i IKEA:s förädlingskedja.
Resultat: En integrerad förädlingskedja med ett tydligt supply chain synsätt, i vilken samtliga aktörer samarbetar och har incitament till medverkan, utgör en förutsättning för en flexibel fysisk distribution. Vi vill även framhålla vikten av att de produkter i ett detaljhandelsföretags sortiment som säljer bäst och endast de varuhus med störst kapacitet, bör ingå. Om den fysiska distributionen skall kunna växla i en förädlingskedja måste berörda aktörer vidare erhålla en planeringshorisont. Detta implicerar att skiften avseende fysisk distribution måste ske säsongsvis och då företrädesvis med direktleveranser i högsäsong. Den flexibla fysiska distributionen kommer att få konsekvenser gällande lager och därmed kostnader för aktörerna.
Tsegaye, Seneshaw Amare. "Flexible Urban Water Distribution Systems." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4597.
Full textHuang, Danguang. "Flexible design of urban water distribution systems." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/2948/.
Full textNock, Richard William Raymond. "Flexible precision timing instrumentation and quantum key distribution." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.658313.
Full textZhang, Irene Y. (Irene Yun). "Efficient file distribution in a flexible,wide-area file system." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53188.
Full textCataloged from PDF version of thesis.
Includes bibliographical references (p. 63-65).
WheelFS is a wide-area distributed file system designed to help applications cope with the challenges of sharing data over the wide-area network. A wide range of applications can use WheelFS as a storage layer because applications can control various trade-offs in WheelFS, such as consistency versus availability, using semantic cues. One key feature that many applications require from any storage system is efficient file distribution. The storage system needs to be able to serve files quickly, even large or popular ones, and allow users and applications to quickly browse files. Wide-area links with high latency and low throughput make achieving these goals difficult for most distributed storage systems. This thesis explores using pre fetching, a traditional file system optimization technique, in wide-area file systems for more efficient file distribution. This thesis focuses on Tread, a pref etcher for WheelFS. Tread includes several types of pre fetching to improve the performance of reading files and directories in WheelFS: read-ahead pre fetching, whole file prefetching, directory prefetching and a prefetching optimization for WheelFS's built-in cooperative caching. To makes the best use of scarce wide-area resources, Tread adaptively rate-limits prefetching and gives applications control over what and how prefetching is done using WheelFS's semantic cues. Experiments show that Tread can reduce the time to read a 10MB file in WheelFS by 40% and the time to list a directory with 100 entries by more than 80%.
(cont.) In addition, experiments on Planetlab show that using prefetching with cooperative caching to distribute a 10MB file to 270 clients reduces the average latency for each client to read the file by almost 45%.
by Irene Y. Zhang.
M.Eng.
Lynch, Alastair M. "Low Cost and Flexible Electronics for Quantum Key Distribution and Quantum Information." Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520592.
Full textHe, Yujun. "Contribution au réglage de la tension sur un réseau HTA avec producteurs. Apport de la flexibilité de la demande." Thesis, CentraleSupélec, 2015. http://www.theses.fr/2015SUPL0005/document.
Full textGrowth of distributed generations (DG) in actual distribution networks will bring voltage issues that cannot be fixed by conventional voltage control means. For the sake of network safety, the size of DG and load in a distribution network is limited by the network parameters. The research described in this thesis aims to propose a voltage control strategy on distribution networks using the flexibility of demand. The voltage control means will consist of the on load tap changer (OLTC), the regulation of DG, and flexible demand. A centralized optimization of MINLP type is proposed to coordinate these voltage control means. It shows if it is not able to remove the voltage constraint with OLTC and reactive power regulation, then it must reduce the active power of DG. In order not to reduce active power of DG, the flexible demand is considered as an active source to take part in voltage control. The demand response (DR) modulation using thermal loads is thus proposed for voltage control. For the thermal load, the cold load pick-up (CLPU) effect must be taken into account in order not to affect the voltage profile after DR action. This work allows us to consider a voltage control strategy more active in smart distribution network and improve the flexibility of network
Bin-Ibrahim, Ahmad Asrul. "Operational planning and optimisation in active distribution systems for flexible and resilient power." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12872/.
Full textHaj-ahmed, Mohammed A. "Protection and Automation of Microgrids for Flexible Distribution of Energy and Storage Resources." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1430694499.
Full textTouré, Sellé. "Optimisation des réseaux : réseau actif et flexible." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENT095/document.
Full textThe Electric Power System is undergoing a lot of evolutions in recent years, including the energymarket deregulation and the increasing integration of Dispersed Generators (DG). Therefore, withinthe framework of Smart Grid concept, the New Information and Communication Technologies (NICT)provide new perspectives to manage and operate distribution networks.In this context, new tools, called Advanced Distribution Automation functions (ADA, are beingstudied). The main objective of these tools is to use all the distribution network components in acoordinated manner to make them more active and flexible, in addition to increasing their operationalefficiency. In our case, we studied the functions associated with the reconfiguration problem, thevoltage control problem and the hybridization of these two, while taking into account the presence ofthe DG. Based on the inherent components of network physical models, several models have beenproposed. Some are derived from the graph theory and others use powerful mathematicalreformulation to make our models convex. The adopted models answer to the necessity of taking intoaccount all regulation means, which can be discrete (On Load Tap-Changer and capacitor banks),binary (components connectivity such as lines or transformers) and continuous (DG reactive power ),and by the choice of tools and algorithms of mixed optimization. Indeed, the complexity of theseproblems is such that we have explored both algorithms: meta-heuristic (ACA, Ant Colony Algorithm)and deterministic (Generalized Benders Decomposition, Branch and Cut Algorithm)
CHEN, JUNLIANG. "A MONTE CARLO EM ALGORITHM FOR GENERALIZED LINEAR MIXED MODELS WITH FLEXIBLE RANDOMEFFECTS DISTRIBUTION." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20011025-112332.
Full textCHEN, JUNLIANG. A Monte Carlo EM algorithm for generalized linear mixed modelswith flexible random effects distribution. (Under the direction of DaowenZhang and Marie Davidian)A popular way to model correlated binary, count, or other data arising inclinical trials and epidemiological studies of cancer and other diseases is byusing generalized linear mixed models (GLMMs), which acknowledge correlationthrough incorporation of random effects. A standard model assumption is thatthe random effects follow a parametric family such as the normal distribution.However, this may be unrealistic or too restrictive to represent the data,raising concern over the validity of inferences both on fixed and randomeffects if it is violated.Here we use the seminonparametric (SNP) approach (Davidian and Gallant 1992,1993) to model the random effects, which relaxes the normality assumption andjust requires that the distribution of random effects belong to a class of``smooth'' densities given by Gallant and Nychka (1987). This representation allows the density of random effects to be very flexible, including densitiesthat are skewed, multi--modal, fat-- or thin--tailed relative to the normal, andthe normal as a special case. We also provide a reparameterization of thisrepresentation to avoid numerical instability in estimating the polynomialcoefficients.Because an efficient algorithm to sample from a SNP density is available, wepropose a Monte Carlo expectation maximization (MCEM) algorithm using arejection sampling scheme (Booth and Hobert, 1999) to estimate the fixedparameters of the linear predictor, variance components and the SNP density. Astrategy of choosing the degree of flexibility required for the SNP density isalso proposed. We illustrate the methods by application to two data sets fromthe Framingham and Six Cities Studies, and present simulations demonstratingperformance of the approach.
Soroudi, Alireza. "Architecture des réseaux de distribution en présence de production décentralisée. Planification sous incertitudes et modes d'exploitation décentralisés." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00738033.
Full textShi, Yunzhu. "Comparison of the stress distribution in the metallic layers of flexible pipes using two alternative Bflex formulations." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26070.
Full textNorén, Andreas. "All-Digital Aggregator for Multi-Standard Video Distribution." Thesis, Linköpings universitet, Kommunikationssystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-149301.
Full textBasupi, Innocent. "Adaptive water distribution system design under future uncertainty." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14722.
Full textLampe, Erik Joseph. "Measuring impact of CONWIP control on production rate and inventory distribution for a flexible production system through simulation." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40459.
Full textIncludes bibliographical references (leaf 30).
This research investigates the production output and inventory distribution of a manufacturing system that produces multiple part types on flexible machines while incorporating CONWIP inventory controls. The production machines, which are separated by individual storage areas for each part type, are modeled as unreliable and operate according to a strict priority sequence. The maximum total inventory of each part type in the entire system is limited a preset number of tokens in the system. While varying the token levels and the demand for finished parts, the average production output for each part type and the average inventory level for each buffer is monitored to understand their behaviors. The relationship between the inventory distributions and the production rates is also investigated. The goal of this research is to develop intuition behind the system behavior.
by Erik Joseph Lampe.
S.B.
Guo, Yue. "Capability assessment of VAr support and demand response to transmission network using flexible tap changing techniques in distribution networks." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/capability-assessment-of-var-support-and-demand-response-to-transmission-network-using-flexible-tap-changing-techniques-in-distribution-networks(5a373163-d2c9-4e13-9720-0c4fa0456c3f).html.
Full textParat, Elisabeth. "Les stratégies de flexibilité adoptées par les protagonistes d'un secteur en crise : le cas de la flière Textile-Habillement-Distribution française." Paris 13, 1997. http://www.theses.fr/1997PA131030.
Full textNguyen, Theanh. "SHM through flexible vibration sensing technologies and robust safety evaluation paradigm." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/78632/5/Andy%20Nguyen%20Thesis.pdf.
Full textRichardson, Ian. "Integrated high-resolution modelling of domestic electricity demand and low voltage electricity distribution networks." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/7968.
Full textAthanasiadis, Nikolaos P. "Modelling, control and design of Flexible AC Transmission Systems (FACTS), custom power devices and variable speed drives for transmission and distribution architectures." Thesis, University of Strathclyde, 1999. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21441.
Full textSmith, Johan. "High voltage direct current strategy solving power delivery shortages to localized area of national grid." Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/1102.
Full textThe industrial and population growth of a nation can cause power delivery problems to localized areas of a national grid through their increased demand for electrical energy. One reason for these power shortages is the insufficient current carrying capacity of existing high voltage alternating current, (HVAC), transmission lines supplying the area. High voltage direct current (HVDC) transmission lines are a possible solution as they provide better power delivery than HVAC lines. New or upgraded HVAC lines, or HVDC lines or combinations of HVAC and HVDC lines are possible solutions to improve power delivery. This research investigates the various line possibilities using theory. and cutting edge frequency and time domain software tools. The challenge is how to approach this problem. What methodology or structure should be used? Thus one of the contributions of this work is the development of a strategy (flow chart), for solving power delivery problems to localized areas of a national grid through individual or combinations (e.g. parallel operation) of HVAC and/or HVDC transmission lines. The main contribution is the evaluation of a HVDC system as a solution to overcoming power delivery shortages to a localized area of a national grid. Three different software packages (two industrial and one academic) namely, PSCAD/EMTDC (time domain), DlgSILENT PowerFactory (frequency domain) and MathCAD software are evaluated for their capability to perform the simulation studies necessary to prove the possible solutions given in the developed flow chart. The PSCAD/EMTDC software package is evaluated for integrated HVAC/HVDC load flow analyses, DlgSILENT for individual and parallel combinations of HVAC lines and MathCAD to prove hand calculations to software results. Five case studies are conducted. The first case study demonstrates a healthy system with no delivery shortcomings, the second case study portrays the delivery shortcoming due to increased localized area demand, and the remaining three case studies explore possible solutions to solve the problem. The first possible solution is to construct an identical HVAC line in parallel to the existing line.
Essaadi, Imane. "Conception de réseaux de distribution pour une personnalisation produit : une contextualisation à l'échelle du continent Africain." Thesis, Paris 10, 2018. http://www.theses.fr/2018PA100182/document.
Full textIn the context of intense international competition, many manufacturing firms are directing their investments toward African markets to increase their market share and maintain their competitiveness in the global market. These markets are rapidly growing but require customized products. Despite their attractivity, trade flows in Africa remain low due to the poor quality of infrastructure and the lack of regional logistic ecosystems, connecting African countries through reliable and efficient services.This doctoral thesis therefore focuses on modelling and solving the problem of designing hybrid distribution networks in Africa, integrating distribution and final customization platforms. These networks incorporate, upstream, regional hubs that serve as gateways to regional markets. The postponement of final customization downstream of the logistics network reduces the delivery times and downstream distribution costs while maintaining upstream economies of scale.The methodology we suggest is based on two main areas of research:▪ The first axis aims to define the location of regional logistics hubs, based on a fuzzy multi-criteria analysis approach, which is an improved version of TOPSIS fuzzy and AHP;▪ The second axis focuses on the design of hybrid distribution networks serving highly diversified markets in Africa (for example: fertilizer markets). To this aim, we propose two new multi-objective optimization models minimizing total operating and investment costs, maximizing product proximity to markets and minimizing damage to finished products during their distribution. The first model is deterministic while the second one proposes a flexible design in response to the dynamics and uncertainty of the evolution of African markets
Shields, Jean-Philippe. "Élaboration du modèle conceptuel flexible et extensible d'une architecture logicielle orientée-objet permettant la parallélisation et la distribution d'une architecture de simulation séquentielle." Thesis, Université Laval, 2007. http://www.theses.ulaval.ca/2007/24474/24474.pdf.
Full textGouin, Victor. "Évaluation de l’impact du Smart Grid sur les pratiques de planification en cas d’insertion de production décentralisée et de charges flexibles." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT097/document.
Full textThe Smart Grids are the combination of electrical networks and new information and communication technologies. They deal with a change of paradigms that are the insertion of distributed generation and the development of new forms of consumption, such as electric vehicles and prosumers. These changes induce many constraints on networks both aging and historically not sized for this context. This thesis studies the impact of these paradigms on the rules for electrical distribution networks planning. A first tool using an adapted simulated annealing algorithm and methods from graph theory was developed to size the networks at low cost, according to the usual rules for planning. Secondly, a methodology combining a Monte Carlo approach and the construction of annual load profiles was proposed to analyze the impact of distributed generation and electric vehicles in an environment subject to uncertainties. The third stage of the work was to implement advanced distribution automations as an alternative to reinforcement, which is very expensive. This part is focused on demand side management. Finally, a new operational planning combining the previous developed tools was created to move towards the planning of the Smart Grids
Hofmann, John. "Extension of the Method of Ellipses to Determining the Orientation of Long, Semi-flexible Fibers in Model 2- and 3-dimensional Geometries." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23921.
Full textPh. D.
Monavon, Arnault. "Etude d'une couche limite instationnaire sur une paroi déformable." Paris 6, 1986. http://www.theses.fr/1986PA066369.
Full textGhias, Nezhad Omran Nima. "Power grid planning for vehicular demand: forecasting and decentralized control." IEEE Transactions on Smart Grid, 2014. http://hdl.handle.net/1993/23891.
Full textOctober 2014
Lessa, Avanir Carlos. "Estudo e modelagem de um DSTATCOM para aplicação em sistemas de distribuição com problemas de desequilíbrio de tensão." reponame:Repositório Institucional da UFABC, 2014.
Find full textDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Elétrica, 2014.
Os sistemas de distribuição de energia elétrica, de um modo geral, são radiais. Estes sistemas podem possuir problemas de qualidade da energia elétrica em suas barras, tais como os desequilíbrios de tensão e de corrente. Ademais, as redes de distribuição podem conter uma grande quantidade de cargas monofásicas e trifásicas desequilibradas, indutivas e não lineares, o que pode resultar nos seguintes problemas: baixo fator de potência, desequilíbrio de tensão e distorção harmônica. Nesse sentido, devido à dinâmica destas cargas e a ocorrência de fenômenos, como afundamento de tensão por partidas de grandes motores e curtos-circuitos, há a necessidade de solução destas anormalidades, com respostas rápidas de estabilização. De maneira a atender a esta necessidade, os resultados das recentes pesquisas baseadas na eletrônica de potência têm proporcionado a utilização de equipamentos capazes de trabalhar em sistemas de potência de alta tensão. Esse avanço permite aplicações de dispositivos FACTS (Flexible Alternating Current Transmission Systems) nas operações de flexibilidade e mitigação de problemas comuns às redes de energia elétrica de transmissão e de distribuição, melhorando, assim, a qualidade da energia elétrica, o que aumenta a confiabilidade destes sistemas. Com este propósito, o presente trabalho tem como objetivo principal o estudo e a modelagem de um DSTATCOM (Distribution Static Compensator) em um sistema de distribuição de energia elétrica com variações de tensão, avaliando os possíveis benefícios proporcionados a este sistema. Os resultados de simulação foram obtidos com o auxílio do software MatLab/Simuling.
Distribution systems of electric power, in general, are radial. These systems have power quality problems in their power bars, such as the voltage variations. Moreover, the distribution networks contain a large amount of single-phase and three-phase unbalanced loads, inductive and non-linear, which may result in the following problems: low power factor, voltage unbalance, and harmonic distortion. Accordingly, due to the dynamic loads and the occurrence of these phenomena, such as voltage sag matches by large motors and short circuits, there is a need for solution of these abnormalities, with responsive stabilization. In order to meet this need, the results of recent research based on power electronics have provided the use of equipment to work on systems of high voltage power. This advancement allows applications FACTS devices (Flexible Alternating Current Transmission Systems) flexibility in operations and mitigation of problems common to the networks of electricity transmission and distribution, thus improving the quality of electric power, which increases the reliability of these systems. For this purpose, the present work has as main objective the study and modeling of a DSTATCOM (Distribution Static Compensator) in a system of electricity distribution, evaluating the possible benefits provided to the electric power system. The simulation results were obtained with the aid of software Matlab/Simuling. The effectiveness of the work has been proven since the DSTATCOM installed, the distribution network operated within established standards.
Klibi, Walid. "The Design of Effective and Robust Supply Chain Networks." Thesis, Université Laval, 2009. http://www.theses.ulaval.ca/2009/26790/26790.pdf.
Full textPrueter, Phillip Edward. "A Study of the Mechanical Design and Gear Tooth Root Strains in Flexible Pin, Multi-Stage, Planetary Wind Turbine Gear Trains Using Three Dimensional Finite Element/Contact Mechanics Models and Experiments." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313372765.
Full textNguyen, Van Liem. "Modeling and control coordination of power systems with FACTS devices in steady-state operating mode." University of Western Australia. School of Electrical, Electronic and Computer Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2009.0036.
Full textCetin, Alper. "Design And Implementation Of A Voltage Source Converter Based Statcom For Reactive Power Compensation And Harmonic Filtering." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608307/index.pdf.
Full text#8710
/Y connected coupling transformer for connection to medium voltage bus. The power stage of VSC based STATCOM is composed of water-cooled high voltage IGBT modules switched at 850 Hz for the elimination of 5th, 7th, 11th, 13th, 17th, 19th, 23rd,and 25th voltage harmonics. Special care has been taken in the laminated busbar design to minimize stray inductances between power semiconductors and dc link capacitor. Reactive power control is achieved by applying the phase angle control technique. The effect of input filter on total demand distortion has been investigated theoretically by mathematical derivations. The proposed VSC STATCOM has been implemented for reactive power compensation of Coal Preparation System in Kemerkö
y Thermal Power Plant. The field test results have shown the success of the implemented system in view of fast response in reactive power compensation, and minimum input current harmonic content, and compliance with the IEEE Std. 519-1992 even for the weakest power systems. The application of selective harmonic elimination technique and phase angle control to VSC STATCOM has led to optimum switching frequency and device utilization for high voltage IGBTs at the expense of slower response as compared to other PWM techniques.
Krtek, Jiří. "Numerická analýza přesypávaných mostních konstrukcí." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-227153.
Full text王文廷. "Statistical Inference for Linear Models with Flexible Error Distributions." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/67319048907453712148.
Full text國立交通大學
統計學研究所
96
In the thesis, we consider statistical inference for a general class of linear regression models. The assumption on the error distribution plays a crucial role for the development of an appropriate inference method. Here we examine several estimation approaches under four types of error distributions including symmetric (with light/heavy tails) and asymmetric distributions. In particular, we focus on the issues of robustness and efficiency. We also discuss how the existing methods are extended to the situation of censoring. Monte Carlo simulations are performed to evaluate the finite-sample performances of different methods.
Fritsch, Arno [Verfasser]. "Bayesian mixtures for cluster analysis and flexible modeling of distributions / by Arno Fritsch." 2010. http://d-nb.info/1008220604/34.
Full textWu, Jyan-cwan, and 吳建冠. "A Study on Efficient and Flexible Decentralized Multicast Key Distribution." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/w5358f.
Full text世新大學
資訊管理學研究所(含碩專班)
96
Multicast communication is becoming the basis for a growing number of Internet based applications. The most common applications of multicast communication are video conference, online TV and on-line games. The secure distribution of services or messages by the server to all multicasting group members requires a security framework that requires an efficient and scalable way for distributing a group key to the eligible members. Most of the existing researches are focusing on group key and group members management, and can be divided into four types: centralized, decentralized, distributed, and hybrid schemes. In this thesis, we propose an efficient and flexible decentralized multicast key distribution scheme with less computational cost and more functionality. The main merits include: (1) the scheme needs no shared keys table between the registration center and all members; (2) a group key is distributed by servers to eligible members; (3) the computation cost is very low; (4) members and servers can authenticate each other; (5) our scheme is a nonce-based scheme which dose not have a serious time-synchronization problem; (6) the shared secret key distribution between dynamic participants is addressed in our proposed scheme, but is not investigated by other decentralized schemes.
Chia-Yu, Liu, and 劉家瑜. "Stress Distribution and Model Design of the Devices on Flexible and Rigid Substrate." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/02958602540023958478.
Full text國立臺灣師範大學
光電科技研究所
98
The cost down is a critical issue for display industry and high density IC development. Before the product design, the TCAD simulation plays an important role to reduce R&D cycles and budget. For flexible display development, the characteristics are portable, lightweight, rugged, arbitrary sharpness, and unrestrained design. However, the electrical characteristics of TFTs may be degraded with mechanical bending, and leaded the panel failure. This paper used in TCAD software is specialized simulation of stress analysis from model building, incorporated into the material parameters, set intrinsic stress, imposed boundary conditions. Step by step, setup is completed that you can reach our want to know the stress and strain. It would help us to understand that the component of the stress concentration and improve IC model design a lot. Not only that, we can also change the material parameters, we can immediately simulate new features of IC components. In this paper, we try to do many different types of materials and bending on the different curvature, such as Top gate or bottom gate a-Si devices, solar cells, titanium or aluminum sandwich board. We also simulated the breakdown of the released energy (Energy release rate) when it broke down. Verifying and changing the model from paper, we expect this data that can contribute to stress analysis for the academic research.
Hussain, Awesar, Jaan H. Pu, and P. R. Hanmaiahgari. "Drag coefficient modelling study for flexible vegetation in open channel flow." 2018. http://hdl.handle.net/10454/16690.
Full textVegetation remains to be an important factor that can hinder the river flow. It needs innovative management scheme, in order to adapt these changes and ensure sustainability of their multiple usages. Vegetation plays an important role in floods and droughts adaptation within river system to alleviate any flood that may propagates from river to its surrounding. Vegetation within river can also retard its flow to cause building-up of deposition, and further adding to uncertainty of water use under extreme droughts. Due to these, it is important to study and understand vegetation drag behaviour toward flow in order to prevent flood risk and water security with hydrological drought in the basin and any other negative impact caused by it. In this study, an analytical approach for river flooding has been studied by improved representation of drag coefficient CD in flow velocity distribution modelling. The analysis of flow parameters, i.e. Reynolds number, on the drag coefficient CD has been conducted. The presented model has been used and analysed in open channel flows with flexible vegetation. In modelling, the flexible vegetated channel layers were divided into vegetation, top of vegetation and water layer zones in the model. The balance of forces for each layer has been established by validation using different reported measured data. The modelling results showed reasonably corresponding prediction of velocity profile in flows with flexible vegetation.
Cheng-Zong, Shieh. "An Efficient and Flexible Key Distribution Scheme for Conditional Access System in Pay-TV Systems." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0016-1303200709283901.
Full textLiao, Chi-chou, and 廖啟州. "Effects temperature distribution on pavement damage and service life for freeway flexible pavements in Taiwan." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/9hpz8y.
Full text國立中央大學
土木工程研究所
97
Asphalt concrete (AC) is a sensitive material with temperature, its stiffness is greatly influenced by ambient temperature. As the temperature of the asphalt concrete increases, its stiffness decreases that may lead to rut occurring on the asphalt pavement from wheel loads. A decrease in asphalt concrete stiffness results in lower structural capacity to support vehicle loads. Therefore, the mechanical property of flexible pavement is affected by temperature deeply. In this study, based on field temperature measurements obtained from a test site simulating actual pavement structures of freeways, the pavement temperature distribution in Taiwan’s freeway were discussed in details. The results indicated the temperature of pavement changes with the climate within a year. Since the thickness of freeway pavements in Taiwan is relatively thick, the temperature distribution of the AC and bituminous treated base (BTB) layers was found to be different. Thus, separate temperature prediction model was established according the characteristic of each asphalt layer. Based on the test results, the effective temperature depth of pavement was affected by the temperature distribution of AC and BTB. Through the analysis on pavement structural responses, it is indicated that the 1/2 depth of AC layer and the 2 cm under the top of BTB layer are considered appropriate depth as effective temperature for strautural analysis of pavements. Also, separate temperature prediction model were established for AC and BTB layers, respectively. Besides, considering the pavement temperature variation within 24 hours and traffic loads applied on freeway pavement, the damage per pass of each load axle was calculated for different times in a day. It was found that the damage increases as pavement temperature increases in the daytime and reduces as the temperature decreases in nighttime. In other words, the temperature cycle within a day has a great effect on the damage level caused by traffic loads in flexible pavement. Moreover, with the thick pavement structure used by Taiwan’s freeway, it was found that the fatigue damage will occur earlier than permanent deformation. Various time-durations, ranging from 1-hour to 1-year, for average temperature input to predict pavement service life and/or design ESAL were evaluated carefully. The effects of pavement average temperature of various time periods and traffic loads on pavement damage ratio and service life were determined. It was found that the 1-hr time period with average pavement temperature could simulate the actual response of freeway pavement under the pavement temperature cycle and traffic loadings. Segmentation of the pavement temperature and traffic loading into 1-hr period will produce a pavement damage ratio greater than that into 1-yr period. This indicates that the actual damage of freeway pavement is more severe than that expected by considering the yearly average temperature only. The adjustment coefficient of pavement service life established the relationship for the apparent difference between the yearly based average temperature and the real situation of in-situ pavement temperature. Using the pavement service life calculated using 1 hr period as the basis, a correlation is established for different time periods for average temperature. It provides an exact relationship obtained from the average temperature of 1 hr period and a yearly period for pavement structure design and the estimation of remaining pavement service life.
Shieh, Cheng-Zong, and 謝丞宗. "An Efficient and Flexible Key Distribution Scheme for Conditional Access System in Pay-TV Systems." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/20294910213955216112.
Full text國立清華大學
資訊系統與應用研究所
94
The pay-TV system becomes one of the popular applications in recent years because of the advancement in modern network technique. The Conditional Access System (CAS) is the essential function to provide the channel protection in pay-TV system. Only the authorized subscribers can precisely receive the TV program, and they were charged by the service provider according to their subscription. In this paper, we defined a new pay-TV model named Flexible-PPC (F-PPC) which allowed subscribers subscribe to a large number of channels and unsubscribed each of them anytime. In order to accomplish the requirements of F-PPC, we also proposed a CAS with a four-level hierarchical key management scheme. The proposed CAS can be applied on a large scale pay-TV system with lots of subscribers and channels. The subscribers can freely choose the channels. Besides, subscribers can subscribe and unsubscribe channels arbitrarily, and the proposed CAS can also revoke illegal subscribers rapidly.
Chen, Junliang. "A Monte Carlo EM algorithm for generalized linear mixed models with flexible random effects distribution." 2001. http://www.lib.ncsu.edu/etd/public/etd-58272011010143040/etd.pdf.
Full textPu, Jaan H., Awesar Hussain, Yakun Guo, Nikolaos Vardakastanis, P. R. Hanmaiahgari, and Dennis Lam. "Submerged flexible vegetation impact on open channel flow velocity distribution: An analytical modelling study on drag and friction." 2019. http://hdl.handle.net/10454/17136.
Full textIn this paper, an analytical model that represents the streamwise velocity distribution for open channel flow with submerged flexible vegetation is studied. In the present vegetated flow modelling, the whole flow field has been separated into two layers vertically: a vegetated layer and a non-vegetated free-water layer. Within the vegetated layer, an analysis of the mechanisms affecting water flow through flexible vegetation has been conducted. In the non-vegetated layer, a modified log-law equation that represents the velocity profile varying with vegetation height has been investigated. Based on the studied analytical model, a sensitivity analysis has been conducted to assess the influences of the drag and friction coefficients on the flow velocity. The investigated ranges of drag and friction coefficients have also been compared to published values. The findings suggest that the drag and friction coefficient values are non-constant at different depths and vegetation densities, unlike the constant values commonly suggested in literature. This phenomenon is particularly clear for flows with flexible vegetation, which is characterised by large deflection.
Carvalho, Micael Luís Morais. "An Overview of Methods for Control of Flexible Resources." Master's thesis, 2016. http://hdl.handle.net/10316/81592.
Full textA 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.
Lowndes, Gillian Claire. "The need for a flexible and discretionary system of marital property distribution in the South African law of divorce." Diss., 2014. http://hdl.handle.net/10500/18819.
Full textPrivate Law
LL.M.
Shields, Jean-Philippe. "Élaboration du modèle conceptuel flexible et extensible d'une architecture logicielle orientée-objet permettant la parallélisation et la distribution d'une architecture de simulation séquentielle /." 2007. http://www.theses.ulaval.ca/2007/24474/24474.pdf.
Full textAguiar, Moya José Pablo 1981. "Development of reliable pavement models." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-3743.
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Petitclair, Patrice. "Modélisation et Commande de structures FACTS : (Flexible Alternative CUITent Transmission System) Application au STATCOM (STATic COMpensator)." Phd thesis, 1997. http://tel.archives-ouvertes.fr/tel-00909634.
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