Дисертації з теми "080501 Distributed and Grid Systems"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-50 дисертацій для дослідження на тему "080501 Distributed and Grid Systems".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Rings, Thomas. "Assessing and Improving Interoperability of Distributed Systems." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2013. http://hdl.handle.net/11858/00-1735-0000-000D-FB51-1.
Повний текст джерелаKyriakidou-Zacharoudiou, Avgousta. "Distributed development of large-scale distributed systems : the case of the particle physics grid." Thesis, London School of Economics and Political Science (University of London), 2011. http://etheses.lse.ac.uk/212/.
Повний текст джерелаWang, Tianqi. "An architecture to support scalable distributed virtual environment systems on grid." Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B31473374.
Повний текст джерелаWang, Tianqi, and 王天琦. "An architecture to support scalable distributed virtual environment systems on grid." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31473374.
Повний текст джерелаPalle, Sreeshailam. "Voltage Harmonic Control of Weak Utility Grid Through Distributed Energy Systems." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1344998933.
Повний текст джерелаVilajosana, Guillén Xavier. "Distributed Resource Allocation for Contributory Systems." Doctoral thesis, Universitat Oberta de Catalunya, 2009. http://hdl.handle.net/10803/9124.
Повний текст джерелаThe thesis presents an approach to on-demand capacity expansion in communities of Internet users that aggregate their resources to achieve a common objective. Such commu- nities are emerging as forms of organisation taking advantage of an increasing broadband access and computational capacity. Volunteer computing such as SETI@home, Collab- orative Grids such as OurGrid and LaCOLLA, Ad-hoc and Peer-to-Peer Grids, such as P-Grid and the XGrid project from Apple, Open Grids such as those addressed by SORMA and Grid4All and many other approaches of Grid Computing based on Virtual Organisa- tions are the focus of our work. These systems are characterised by the purpose of their participants, i.e. to achieve a common objective taking advantage of the aggregation of other resources. The cited systems, in contrast to high performance computing Grids, are open to new participants, which makes their behaviour unpredictable and dynamic, and resources are usually connected and disconnected spontaneously. While the critical aspect of high performance Grids is computational performance, stability and availability are the main issues for the systems addressed in this work. The thesis homogenises the concepts of those paradigms under the term Contributory System, which is used throughout the thesis to refer to the systems where users provide their resources to be used collectively to achieve a common objective. Resource expan- sion in Contributory Systems is required so as to increase the limited capacities of ad-hoc collaborative groups under unexpected load surges, temporary resource requirements or other policies defined by the objectives of the Virtual Organisation that they constitute. Four aspects are addressed by the dissertation. Firstly, it identifies the main properties and applications of Contributory Systems and motivates the need for infrastructures to enable on-demand resource expansion. This goes in the direction of Utility Computing trends which are main business lines for IT companies. Thus the thesis proposes the on-demand provision of idle resources from the extremes of the Internet, other Virtual Or- ganisations or Resource Providers to those organisations that have resource needs. In this work, resource allocation is handled by market models which provide efficient while simple mechanisms to mediate the allocation of resources. This proposal enables new emerging opportunities to Internet users to make their business on the Internet by selling their idle resources. Besides, this brings the opportunity to small communities to grow and to bring super-computing capacities to Internet end-users. Secondly, the thesis describes semantically Computational Resources so as to build a common knowledge about the Internets resources. The semantic description enables a common understanding of the nature of resources, permitting the pooling and aggrega- tion of distinct types of technologies while maintaining the same semantics. This makes applications and resource management frameworks independent of the real nature of the resources which we claim as a fundamental aspect to keep resource management indepen- dent of the dynamics and evolution of technology in computational environments, such as in Contributory Systems. A semantic description permits the development of generic specifications to provide bid and offer descriptions in computational markets. Thirdly, the architecture for on-demand resource expansion in Contributory Systems is presented. It has been designed to provide the main functionalities to on-demand provi- sion of resources through markets to scenarios characterized by dynamism, evolution and heterogeneity. The architecture provides the main market oriented functionalities and en- ables dynamic and on-demand execution of market mechanisms. Finally, a specific Grid-oriented market mechanism is presented. The approach is moti- vated due to the unsuitability of current auctions to efficiently allocate time-differentiated resources (usually provided by many different resource providers) such as most of the re- sources in a Contributory System. The thesis builds a roadmap to achieve flexible and decentralized resource expansion in communities where resources are shared by their participants by analysing the main scenarios where it can be applied, providing the semantics and specification to enable the description of the user's requirements, proposing a flexible and configurable architecture to deal with on-demand resource expansion in Virtual Organisations and proposing an specific mechanism adapted to trade computational resources.
Leslie, Matthew John. "Reliable peer to peer grid middleware." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:90d21e54-3849-46d1-aa8a-5f0c4f80d42a.
Повний текст джерелаAl-Omari, Ali Hussein Abduljabbar. "Contributions to converters in single phase distributed photovoltaic systems." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/11159.
Повний текст джерелаTongsopit, Sopitsuda. "The political economy of grid-connected distributed power generation systems in California /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2008. http://uclibs.org/PID/11984.
Повний текст джерелаLorch, Markus. "PRIMA - Privilege Management and Authorization in Grid Computing Environments." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/26995.
Повний текст джерелаPh. D.
Buyya, Rajkumar 1970. "Economic-based distributed resource management and scheduling for grid computing." Monash University, School of Computer Science and Software Engineering, 2002. http://arrow.monash.edu.au/hdl/1959.1/8760.
Повний текст джерелаMatsui, Aurélio Akira Mello. "Um ambiente de desenvolvimento e execução de aplicações grid escritas totalmente em Java." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-15092006-155448/.
Повний текст джерелаThis thesis proposes a platform for computational grids distributed applications development and execution. The purpose of this platform is to simplify the development of such applications while delivering access to shared resources in a grid environment. In the proposed schema, the grid development environment has a close link with the grid itself as the grid distributes the execution of programs created by the development environment in an automated fashion. Besides presenting a way to develop applications, this thesis also proposes a grid infrastructure composed by a message system, a job scheduler based on fuzzy theory and a simple mechanism of distributed persistence.
Chen, Liang. "A grid-based middleware for processing distributed data streams." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1157990530.
Повний текст джерелаRutvika, Nandan Manohar. "Design of Distributed Stand-alone Power Systems using Passivity-based Control." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263619.
Повний текст джерелаLi, Xiao-Yu. "Evolving a secure grid-enabled, distributed data warehouse : a standards-based perspective." Thesis, Nelson Mandela Metropolitan University, 2007. http://hdl.handle.net/10948/544.
Повний текст джерелаAl-Shishtawy, Ahmad. "Self-Management for Large-Scale Distributed Systems." Doctoral thesis, KTH, Programvaruteknik och Datorsystem, SCS, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101661.
Повний текст джерелаQC 20120831
Malekpour, Ahmadreza. "Smart grid operational strategies for power distribution systems with large penetration of distributed energy resources." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/34681.
Повний текст джерелаDepartment of Electrical and Computer Engineering
Anil Pahwa
Power distribution systems are transitioning from traditional centralized-control distribution grids to the modern distribution grids that are more customer-interactive and include microgrids (MGs) as well as various unpredictable and multi-scale distributed energy resources (DERs). However, power fueled by renewable DERs such as wind and solar is highly variable and high penetration of renewable DERs in distribution system may potentially degrade the grid reliability and power quality. Moreover, the growth of such generation sources will increase the number of variables and cause scalability concerns for distribution system operators (DSOs) in handling system optimization problems. Further, with development of MGs, DSO and MG may have different owners and schedule renewable and non-renewable DERs based on their own economic rules and policies while secure and economic operation of the entire system is necessary. The widespread integration of wind and solar and deployment of MGs in distribution system make the task of distribution system operation management quite challenging especially from the viewpoint of variability, scalability, and multi-authority operation management. This research develops unique models and methodologies to overcome such issues and make distribution grid operation, optimization and control more robust against renewable intermittency, intractability, and operation complexity. The objectives of this research are as follows: 1) to develop a three-phase unbalanced large-scale distribution system to serve as a benchmark for studying challenges related to integration of DERs, such as scalability concerns in optimization problems, incremental power losses, voltage rise, voltage fluctuations, volt/var control, and operation management; 2) to develop a novel hierarchical and multilevel distributed optimization for power loss minimization via optimal reactive power provisioning from rooftop PVs which addresses the scalability issues with widespread DER integration in large-scale networks; 3) to develop a dynamic operational scheme for residential PV smart inverters to mitigate the fluctuations from rooftop PV integration under all-weather-condition (fully sunny, overcast and transient cloudy days) while increasing network efficiency in terms of power losses, and number of transformer load tap changer (LTC) operation; 4) to develop a stochastic energy management model for multi-authority distribution system operating under uncertainty from load and wind generation, which is able to precisely account interactions between DSO and MGs.
Guo, Junyao. "Distributed Optimization in Electric Power Systems: Partitioning, Communications, and Synchronization." Research Showcase @ CMU, 2018. http://repository.cmu.edu/dissertations/1140.
Повний текст джерелаShen, Ming. "Distributed Solar Photovoltaic Grid Integration System : A Case Study for Performance." PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/945.
Повний текст джерелаArafat, Md Nayeem. "Modeling and Control of Distributed Energy Systems during Transition Operation between Grid Connected and Standalone Modes." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1405888130.
Повний текст джерелаAlZahrani, Saleh Saeed. "Regionally distributed architecture for dynamic e-learning environment (RDADeLE)." Thesis, De Montfort University, 2010. http://hdl.handle.net/2086/3814.
Повний текст джерелаLingfors, David. "Solar Variability Assessment and Grid Integration : Methodology Development and Case Studies." Licentiate thesis, Uppsala universitet, Fasta tillståndets fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-265451.
Повний текст джерелаLiu, Kai, and 劉愷. "Optimal dispatch and management for smart power grid." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46336680.
Повний текст джерелаAminou, Moussavou Anges Akim. "Modelling and analysis of microgrid control techniques for grid stabilisation." Thesis, Cape Peninsula University of Technology, 2014. http://hdl.handle.net/20.500.11838/1184.
Повний текст джерелаIn recent times, renewable energy-based distributed generation (DG) has captivated the industrial sector and on a global scale this has become a leading research area. Distributed generation using wind, solar energy or biomass as a source of energy can produce electricity on a small scale. Therefore, there is a strong focus on using renewable energy as a safe alternative source of energy, especially because it can in future play a dominant role in the world’s energy production and help to tackle the increase of global warming caused by fossil energy. However, a major problem facing renewable energies is that they are highly dependent on weather conditions. Since the power generated by DG, as well as consumption, depends on the weather conditions, irregularity of production and consumption leads to frequency and voltage fluctuations, and it can become difficult to determine and monitor consumer usage at any given time. Distributed generation can then be subjected to discrepancies in consumer usage and this can lead to severe overloading. As a result, microgrids powered by DG, operating in a single, stand-alone controllable system mode, face new challenges in terms of balancing a cluster of loads. Balancing a cluster of loads by making sure at all times that the entire system operates without overloading, is an essential requirement for the proper operation of a power system. The microgrid load considered in this project is the sum of sensitive and non-sensitive loads, respectively 5 kW and 100 kW, which constitute load requirement of one village; this total load required by a number of villages is called a cluster load. Depending on the input power generated by a DG-based photovoltaic (PV) system, these loads can be controlled using a logic control switch (LCS). When the power produced is less than the minimum load required by a component of a cluster, overloading occurs. The purpose of using an LCS is to ensure that a stable system is maintained under various loads and resource conditions. An LCS is used to continuously monitor and adjust load through circuit breakers. It is a good alternative to load balancing for a cluster of villages in rural area where a microgrid is operating in stand-alone mode. The focus of this research is to design a photovoltaic system with a maximum capacity of 1 MW providing power to a cluster of rural villages, and operating in stand-alone mode, and then to apply different control techniques (droop control, dq0 reference frame + proportional integral (PI) controller, and PI controller alone) at the inverter terminal of the PV system, in order to evaluate the stability of the output voltage. Another goal of the research is to develop an energy management system (EMS) algorithm to support the PV system in reducing loads. Therefore, a iii stable system under various load and resource conditions, as well as suitable control mechanisms are required to model a PV system. There is a need for the modelling of a PV array using a physical modelling block in MATLAB (SIMULINK) software. The state flow provided by SIMULINK is used in this project to develop an algorithm for load balancing. The state flow gives possibilities of modelling complex algorithms by combining graphical and tabular representations to create sequential decision logic, derived from state transition diagrams and tables, flow charts and truth tables. Furthermore, the design of a microgrid using photovoltaic DG and an energy management system, has been developed. The present work mainly consists of a stand-alone microgrid operation, where the power generated must be equal to the load power. In addition, different control methods, consisting of a dq0 reference frame + PI controller, are analysed at the invertor terminal. Subsequently an LCS algorithm is developed; this is required to maintain the system within certain limits and prevents overloading. LCS algorithms are based on a flowchart and allow switching automatically selected loads, depending on the power (solar radiation) available. In addition, a flow chart provides an easy way of using a graphical transition state and state chart to establish a set of rules for the system. The simulation results show that both droop control and a dq0 reference frame + PI controller are much better than a PI controller alone; these results also compared well with similar studies found in the literature. Also, these results are further improved with an EMS in order to maintain the output voltage of the microgrid, by switching on and off certain loads depending on the input power. The modelling of the microgrid using DG, based on photovoltaic systems with a maximum capacity of 1 MW, supports and improves the PV system by reducing loads. Moreover, droop control, and dq0 transformation + PI control present a better result than PI controller alone.
Ghorbani, Mohammadmersad. "Computational analysis of CpG site DNA methylation." Thesis, Brunel University, 2013. http://bura.brunel.ac.uk/handle/2438/8217.
Повний текст джерелаAnjos, Julio Cesar Santos dos. "Adequação da computação intensiva em dados para ambientes desktop grid com uso de MapReduce." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/71673.
Повний текст джерелаThe emergence of data volumes in the order of petabytes creates the need to develop new solutions that make possible the processing of data through the use of intensive computing systems, as MapReduce. MapReduce is a programming framework that has two functions: one called Map, mapping, and another reducing called Reduce, applied to a particular data entry. This programming model is used primarily in large clusters and their tasks are normally independent. The programmer is abstracted from the parallelization process such as division and data distribution, fault tolerance, data persistence and distribution of tasks. The motivation of this work is to apply the intensive computation model of MapReduce with large volume of data in desktop grid environments. The goal then is to investigate the intensive computing in heterogeneous environments with use MapReduce model. First the problem of resource heterogeneity is solved, not treating the moment of the volatility. Due to deficiencies of the MapReduce model in heterogeneous environments it was proposed the MR-A++; a MapReduce with algorithms adequated to heterogeneous environments. The MR-A++ model creates a training task to gather information prior to the distribution of data. Therefore the information will be used to manager the system. To evaluate the algorithms change it was employed a 2k Factorial analysis and simulations with the simulant MRSG built for the study of environments (homogeneous and heterogeneous) large-scale use of MapReduce. The small delay introduced in phase of setup of computing compensates with the adequacy of heterogeneous environment to computational capacity of the machines, with gains in the run-time reduction of jobs exceeding 70% in some cases.
Teixeira, Fabiano Costa. "Grid Anywhere: Um middleware extensível para grades computacionais desktop." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-07122012-091005/.
Повний текст джерелаThis PhD thesis presents investigations, models and implementations of a computational grid middleware named Grid Anywhere. This platform aims at allowing the build of computational grid systems, which enable the increase of the number of participants as consumers and resource providers. In order to do this, new solutions are presented to manage security policies, load applications, host objects, execute remote methods, develop application and alternative transport of SOAP messages in a flexible way (using the interactive digital television system and inserting one SOAP message inside another document of this same protocol). As applications of this middleware, two different architectures of computational grids were created. The first one enables an environment to share resources that are used as infrastructure to provide platform as a service (PaaS) in a cloud computing system. The goal of the second architecture is to increase the computational power of desktop computational grid systems using digital television receivers (set-top box) as resource providers, where the distribution of objects and SOAP messages occurs via broadcasting. The models were validated by means of real tests using the respective implementations, which showed that the platform is functional. Such implementations provide software products that help the innovation and development of computational grid applications and also others types of distributed systems
Ďuriš, Anton. "Simulace distribuovaných systémů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-442811.
Повний текст джерелаThacker, Timothy Neil. "Phase-Locked Loops, Islanding Detection and Microgrid Operation of Single-Phase Converter Systems." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/29281.
Повний текст джерелаPh. D.
Lingfors, David. "Solar Variability Assessment in the Built Environment : Model Development and Application to Grid Integration." Doctoral thesis, Uppsala universitet, Fasta tillståndets fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-332714.
Повний текст джерелаKhasawneh, Hussam Jihad. "Sizing Methodology and Life Improvement of Energy Storage Systems in Microgrids." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429638668.
Повний текст джерелаKhan, 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 джерелаJung, Jin Woo. "Modeling and control of fuel cell based distributed generation systems." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1116451881.
Повний текст джерелаTitle from first page of PDF file. Document formatted into pages; contains xvi, 209 p.; also includes graphics. Includes bibliographical references (p. 202-209). Available online via OhioLINK's ETD Center
Chilappagari, Sairam. "Role of web services for globally distributed information retrieval systems in a grid environment implementation and performance analysis of a prototype /." Fairfax, VA : George Mason University, 2008. http://hdl.handle.net/1920/3220.
Повний текст джерелаVita: p. 108. Thesis director: J. Mark Pullen. Submitted in partial fulfillment of the requirements for the degree of Master of Science in Computer Science. Title from PDF t.p. (viewed Aug. 28, 2008). Includes bibliographical references (p. 101-107). Also issued in print.
Ayoubi, Tarek. "Distributed Data Management Supporting Healthcare Workflow from Patients’ Point of View." Thesis, Blekinge Tekniska Högskola, Avdelningen för för interaktion och systemdesign, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-6030.
Повний текст джерелаHaji, Miragha Amirhossein. "Generation Control in Small IsolatedPower Systems." Thesis, KTH, Elektroteknisk teori och konstruktion, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118921.
Повний текст джерелаKruger, Gustav Reinhold. "Design considerations of South African residential distribution systems containing embedded generation." Diss., University of Pretoria, 2005. http://hdl.handle.net/2263/66208.
Повний текст джерелаDissertation (MEng)--University of Pretoria, 2017.
Electrical, Electronic and Computer Engineering
MEng
Unrestricted
Ng, Kwok-kei Simon, and 吳國基. "Optimal planning and management of stochastic demand and renewable energy in smart power grid." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B50434299.
Повний текст джерелаpublished_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
Mungioli, Antonio Saverio Rincon. "Uma proposta de tecnologia para videoconferência integrando tecnologias grid." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-23032006-220551/.
Повний текст джерелаThe development of videoconferencing without the use of equipments with customized technology or without commercial networks (like Internet 2) or without common characteristics (as Multicast, for instance) has appeared as a challenge to the subject researchers. This work presents a proposal of solution to this problem, showing that is possible to create a videoconference between many rooms under the Internet 1, with quality of service, using common commercial computing equipments and without overloading the network. For this, two technologies of grid (AccessGrid and Grid Delivery) have been integrated, proposing the basis of a new version of Access Grid, called MPAG (MultiPeer Access Grid).
Almenar, Molina Irene. "Planning the future expansion of solar installations in a distribution power grid." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-427190.
Повний текст джерелаGoldchleger, Andrei. "InteGrade: Um Sistema de Middleware para Computação em Grade Oportunista." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/45/45134/tde-02042005-172926/.
Повний текст джерелаThe past years witnessed a substantial increase in the need for computing power in various fields of human activity, including many industrial and academic endeavors. Grid Computing addresses those needs, providing seamless access to distributed computing resources, allowing one to use the combined computing power of various machines. However, the majority of the earlier Grid Computing systems focused on connecting high performance computers, which are very expensive resources only accessible to a small number of institutions. Contrasting with high cost parallel computing, personal computing experienced a tremendous growth in the last fifteen years. Personal computers are ubiquitous, cheap, and extremely powerful. The increase in processing power motivated the creation of dedicated PC clusters, allowing one to perform high performance computing tasks at a fraction of the price of a traditional parallel machine. Although cheaper, building a cluster still requires a considerable investment. At the same time, institutions that rely on the processing power of dedicated clusters typically own a large number of personal computers that are idle for most of the time, resulting in a loss of computing power that could otherwise be used for computing tasks. Opportunistic Grid Computing systems allow the use of the idle computing power of personal computers to perform useful computation. Many Opportunistic systems were successfully employed to solve problems in areas such as astronomy, biology, and mathematics. InteGrade, an Opportunistic Grid Computing system developed in the context of this thesis, aims to provide features not commonly available in other Opportunistic systems, such as support for parallel applications that require communication among application nodes, and usage pattern collection and analysis, which will allow for better scheduling decisions by providing predictions about future resource availability. InteGrade is a fully object oriented system, featuring both object oriented architecture and implementation. The work presented in this thesis includes a survey of existing Grid Computing systems and the definition of the InteGrade initial architecture, including the specification and implementation of various software modules. We also present the design and implementation of a parallel programming library that implements the BSP computing model, which allows one to write parallel applications that execute on InteGrade.
Alves, Higor Aparecido Vieira. "Oncogrid: uma grade computacional para a integração e compartilhamento de dados médicos em oncologia." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3142/tde-20082009-154527/.
Повний текст джерелаIn Brazil the cancer information is distributed among several institutions that accomplish your treatment, in this context we are need tools to build a national scenery that can be aid the cancer care. This context motivated the Oncogrid creation that is a grid computing for integration and sharing medical data in oncology and will allow the medical community to analise the applied treatments with reflection in cancer management.A study was done to analise the several architectures and components used in grid projects to health care, making possible to propose a flexible, modular and scalable architecture to the Oncogrid accordingly with the brazilian reality. An initial project between LSI/EPUSP and NUTES/UFPE that was developed an application to plot the survival curve using the Kaplan-Meier method and allow the evaluation of the Oncogrid architecture. The results achieved confirm the architecture viability used and the proposal potentiality of a grid computing with a new paradigm to the integration and sharing informations. The Oncogrid shows a viable computing architecture to Brazil, especially to access distributed information that can be prove great contributions to treatment evolution and to develop new research areas.
SHIVAKOTI, BINAYA RAJ. "DEVELOPMENT OF A NEW DISTRIBUTED WATER QUANTITY AND QUALITY MODEL COUPLED WITH REMOTE SENSING AND GEOGRAPHIC INFORMATION SYSTEMS (GIS) AND ITS APPLICATION IN A SMALL WATERSHED." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/49128.
Повний текст джерелаUnderstanding river water quantity and quality variation is one of the fundamental requirements for the integrated watershed management. Monitoring is usually preferred to examine and understand the river water quantity and quality, especially focusing on pre-specified objectives. Although monitoring is invaluable in many instances, it is of less use to forecast the foreseeable changes, especially, for the long-term prediction that is usually required by the decision-makers. Therefore, for the decision-making, modeling is widely practiced. Due to the limited understanding of hydrological processes inside a watershed, models often fail to estimate properly, which in worst case could often mislead the targeted plans. Among several aspects, spatial variability such as land cover, topography, soil, geology is believed to affect the overall performance of the model. Such thought lead to the concept of distributed models that were supposed to represent spatial variability through modeling specific variations inside the watershed by using several representative units or grids. In that meaning, distributed models required to identify and assign the values of its parameters to represent the physical processes defined by the governing equations for each grid. Due to the unavailability of required spatial information at appropriate grid sizes, even physically based and conceptually sound distributed models fail to estimate properly thereby offsetting the credibility of distributed models. Therefore, in this study, we set a major objective to develop a new distributed water quantity and water quality model to address some of the stated issues. Major emphasis was given to conceptually sound but simple structure of the model. In addition to that, model aimed to utilize the potential of recent advances in spatial information, such as remote sensing and GIS, to generate and process the spatial data, and to determine the values of its essential parameters. The approach was expected to provide an example that the complexity of the model should be preferred only if the defined processes could be ascertained within some reasonable limit. At the initial stage, several spatial data were collected from different sources and they were processed into raster format, which was one of the essential requirements for the distributed model. Analysis of spatial database indicated that the watershed was characterized by forested parts in the hills, and densely populated urban areas in plains. Rainfall occurred quite frequently but they were of short duration. Besides constructing spatial database, several water quantity and quality surveys were also conducted at different spatial and temporal conditions from 2000 to 2006. The data were mainly used to understand variation patterns of water quantity and quality at both spatial and temporal conditions. Later on, some of the data were also used for the verification of model in study area. 28 water quality indices (WQIs) were observed for each observation, which were mainly utilized to understand the overall variation pattern of river water quality. Initial analysis of flow rate condition of the river showed that the rainfall-runoff responses were quite rapid after the rainfall but such effect appear for very short duration (< 2 days). Then, analysis of variance (ANOVA) and two multivariate analysis techniques (MVA), namely, principle component analysis (PCA) and cluster analysis (CA) were used to explore effectively the river water quality datasets. Analysis showed that the observed covariation among majority of WQIs could be due to the inter-linkages among rainfall pattern, atmospheric deposition of acidic ions, soil and geology of dominant forest areas, topography, and climatic conditions. The identified pattern indicated that there could be close relationship between the biogeochemical processes in the forest areas with both river water quantity and quality variation. A new distributed water quantity and quality model was developed especially focusing on the biophysical characteristics of the watershed. Basic structure of the model was similar to the concept of lumped tank model, which was often credited for its simple and sound conceptual structure. Two storey tanks were conceptualized for each grid, but model also took into consideration of drainage channels in urban areas and natural river channels as rapidly conveying structures. Besides, the model considered all major aspects affecting the estimation of water quantity, such as interception of the rainfall, evapotranspiration loss, surface runoff, sub-surface runoff, and ground water runoff. Compared with the original tank model, major emphasis was given to assign the values major parameters, such as coefficients and storage heights of the outlets, by relating them with the hilly topography of the study area and the variation in land cover, soil, and geology. The model was further integrated with water quality component, which was based on two fundamental assumptions of build-up and wash-off of the WQIs in the environment. Build-up was based on the land cover type and population, while wash off was based on the estimated runoff volume. Remote sensing and GIS techniques were used to assist in the modeling process. At first, remote sensing was mainly focused in the classification of land cover by utilizing seasonal Landsat ETM+ images. In addition to urban and vegetated urban categories, four major forest categories (shaded, deciduous, mixed, and evergreen) were identified. Then leaf area index (Lai) was determined for each vegetation category. Lai was mainly used to determine the rainfall interception by the canopy in the forest areas. In this study, forest areas showed the capacity to intercept as high as 1.2 mm of rainfall, which could be quite important during smaller rainfall events. Remote sensing was further used to determine the transpiration coefficient of the vegetations, which was a major requirement for the estimation of evapotranspiration (Et) loss by the FAO Penman- Monteith method used in the model simulation. Et was estimated even reached more than 4 mm/d in summer months, but it was relatively lower (< 2 mm/d) in the winter months. These facts suggested that consideration of both interception and Et loss in a forested watershed could have significant influence on the estimation of flow rates by the model. At the final stage, model was applied in the study area. Mainly three approaches were considered to assess the estimation by the model. First was conventional approach in which comparison between the observed and estimated data were done considering different spatial and temporal contexts. Assigned values of the parameters gave satisfactory prediction for both water quantity and quality for the selected grid size of 50 m in which the relative error was usually less than 1. The second approach evaluated the model by considering different scale of the grids ranging from 100m to 500m. It was observed that grid resizing usually affected the basin attributed such as slope, outlet height, drainage characteristics following nearly proportionate pattern than other categorical variables such as land cover or geology. Usually same parameter values gave very different prediction level for both magnitude and shape of the hydrographs (or pollutographs), in which increasing grid size was accompanied by the increasing peak event estimation or overall error. The effects were further assessed by changing the values of key parameters for each grid size targeting the minimum differences between the observed and estimated values. Interestingly, the parameters also showed some identifiable (increasing or decreasing) trend with the change in grid size. Particularly, due to the direct effect of predicted runoff on the reference WQIs, its showed more complex variation pattern at different grid sizes. Overall assessment of the distributed model indicated that the model was quite sensitive to the selection of key parameters for different grid sizes. It indicated that the values of calibrated parameters might not give stable result if the scale of input data were changed. It could further indicate that the choice of grid size should be assessed before the actual application of the model considering the spatial variability of the watershed. In the third approach, model was utilized to estimate at different scenarios, namely, rainfall variation and land cover changes. The differences in the estimated results could indicate that the model could be available for the watershed management at different runoff and land cover scenarios in future.
Kyoto University (京都大学)
0048
新制・課程博士
博士(工学)
甲第13378号
工博第2849号
新制||工||1419(附属図書館)
25534
UT51-2007-Q779
京都大学大学院工学研究科都市環境工学専攻
(主査)教授 田中 宏明, 教授 藤井 滋穂, 教授 清水 芳久
学位規則第4条第1項該当
Gensollen, Nicolas. "Modeling and optimizing a distributed power network : a complex system approach of the "prosumer" management in the smart grid." Thesis, Evry, Institut national des télécommunications, 2016. http://www.theses.fr/2016TELE0019/document.
Повний текст джерелаThis thesis is devoted to the study of agents called prosumers because they can, from renewable, both produce and consume electricity. If their production exceeds their own needs, they are looking to sell their surplus on electricity markets. We propose to model these prosumers from meteorological data, which has allowed us to highlight non trivial spatial and temporal correlations. This is of great importance for aggregators that form portfolios of equipments to sell services to the network operator. As an aggregator is bound by a contract with the operator, it can be subject to penalties if it does not fulfill its role. We show that these correlations impact the stability of aggregates, and therefore the risk taken by the aggregators. We propose an algorithm minimizing the risk of the aggregations, while maximizing the expected gain. The placement of storage devices in a network where generators and loads are stochastic and not fixed is complex. We propose to answer this question with control theory. We model the electrical system as a network of coupled oscillators, whose phase angles dynamics is an approximation of the actual dynamics of the system. The goal is to find the subset of nodes in the graph that, during a disturbance of the system, allows returning to equilibrium if the right signals are injected and this with a minimum energy. We propose an algorithm to find a near optimal placement to minimize the average energy control
Azzam, Adel R. "Survey of Autonomic Computing and Experiments on JMX-based Autonomic Features." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2123.
Повний текст джерелаMazloomzadeh, Ali. "Development of Hardware in the Loop Real-Time Control Techniques for Hybrid Power Systems Involving Distributed Demands and Sustainable Energy Sources." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1666.
Повний текст джерелаMidtsund, Tarjei. "Control of Power Electronic Converters in Distributed Power Generation Systems : Evaluation of Current Control Structures for Voltage Source Converters operating under Weak Grid Conditions." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11413.
Повний текст джерелаHobbs, Ivan Kevin. "Evaluation and implementation of anti-islanding methods for converter-fed distributed generation." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1559.
Повний текст джерелаThesis (MScEng (Electrical and Electronic Engineering))--Univerity of Stellenbosch, 2009.
ENGLISH ABSTRACT: As the number of distributed generation units connected to a distribution network increase, the possibility of island formation increases. An island is formed when distributed generation units continue to energize local loads within a section of the grid, which has been disconnected from the main distribution network. These islands pose significant danger to maintenance personnel as well as to members of the public. In this study, an investigation is done into various anti-islanding methods. The modes of operation of these methods are discussed, as well as their strengths and weaknesses. The slip-mode frequency shift method and the Sandia voltage shift method, in combination with over/under voltage and frequency protection, are simulated and tested to confirm their functionality. The results obtained show that it is possible to prevent distributed generation units from energizing local loads when the grid is disconnected.
AFRIKAANSE OPSOMMING: Die moontlike toekomstige toename in die aantal verspreide generasie eenhede gekoppel aan die verspreidings netwerk, verhoog die moontlikheid van eiland vorming. ‘n Eiland word gevorm wanneer verspreide generasie eenhede energie aan lokale laste voorsien nadat die netwerk ontkoppel is. Dit hou groot gevaar in vir onderhouds personeel asook vir die publiek. In die tesis word ‘n studie gedoen oor die verskillende metodes om die vorming van ongewensde eilande te voorkom. Die glipmode-frekwensieskuif metode en die Sandia spanningskuif metode word gekombineer met die oor/onder spanning en frekwensie beskerming metodes. Die kombinasie van metodes word dan gesimuleer en eksperimenteel getoets. Die verkrygde resultate toon dat dit moontlik is om die vorming van ongewensde eilande effektief te voorkom.
Bianchini, Calebe de Paula. "Um ambiente para programação orientada a objetos distribuídos e paralelos em grades computacionais." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-26032009-171120/.
Повний текст джерелаGrid computing is already a reality both in academic and business world. Its use has become popular mainly because of the projects in this area and the advertising of products and software that offer this idea. Nevertheless, environments for development of object-oriented applications in Java for grid infrastructure are still scarce. Some initiatives offer libraries for this development. Others use different paradigms such as the message-passing for development of applications. Moreover, the infrastructure of grid, formed by different administrative domain with different security policies, prevents the execution of applications at various levels in the grid. These levels, formed by computers and clusters of computers with execution nodes, have private addresses, make impossible the transparent communication of the applications allocated in each of these computers at different levels in different domains. Focused on these problems, this thesis presents an environment for distributed and parallel object-oriented programming in Java, called J4GE. In this environment, the object-oriented model is the basis for the distribution of classes, methods and attributes in an existing application. Moreover, the environment offers transparency in objects access around the grid through a Message Service, regardless the level where is the resource, or the computer, or the execution node. This transparency also allows the programmer to use the Java platform without knowing or learning new libraries or paradigms, reducing the effort in developing applications for grid. The resources of the Java platform and the environment J4GE together can create distributed objects with parallel and concurrent behavior, bringing greater efficiency to the application.
Pulgar, Romero Francisco Leonardo. "Diseño e implementación de sistema distribuido y colaborativo de peticiones HTTP/S." Tesis, Universidad de Chile, 2018. http://repositorio.uchile.cl/handle/2250/168613.
Повний текст джерелаEn la actualidad existen muchos computadores y dispositivos tecnológicos con capacidad computacional ociosa, con el potencial de ser usados. Es así como existen una gran cantidad de proyectos donde personas donan voluntariamente su poder computacional para ayudar en problemas tales como: renderización de animaciones 3D, correr simulaciones de experimentos, estudiar conjeturas matemáticas, optimización de variables y parámetros en Machine Learning, estudiar estructuras de proteínas y moléculas, clasificación de galaxias, predicción del clima, entre un sinfín de aplicaciones posibles tanto en el área de investigación como en el área empresarial. Esa necesidad de poder de procesamiento y recursos computacionales ha llevado a crear tecnologías como la computación grid (o en malla), que consiste en un sistema de computación distribuido que permite coordinar computadoras de diferente hardware y software haciendo uso de estos para resolver en paralelo tareas en común. La presente memoria tiene como fin la creación de un sistema distribuido en malla donde dispositivos tecnológicos se comunican con un servidor central para recopilar datos de internet; usando así la capacidad ociosa de dispositivos tecnológicos y brindando ayuda voluntaria a aquel que necesite recopilar datos de internet. Durante el desarrollo de este trabajo se implementa un sistema de administración de usuarios y dispositivos tecnológicos realizado con Django, un sistema de distribución de consultas HTTP/S desarrollado con Tornado y un software que corre de lado de los dispositivos tecnológicos para resolver tareas y mandar resultados, hecho en Python. Estos tres sistemas se comunican entre ellos para lograr la distribución de las consultas HTTP/S, pero son independientes entre sí, ayudando a la escalabilidad y tolerancia a fallos del sistema general. Finalmente se realizan pruebas y experimentos de los diferentes componentes para obtener datos relevantes que nos permitan estudiar el comportamiento del sistema, identificando ventajas y desventajas del uso del mismo. Los resultados obtenidos muestran que a medida que aumenta la cantidad de dispositivos tecnológicos que colaboran en una tarea, disminuyen los tiempos de resolución de éstas; además se demuestra una correlación directa entre el tiempo de respuesta de una consulta HTTP/S y la distancia física que existe entre el dispositivo que hace la consulta y el servidor web.