Дисертації з теми "Multi-model systems"
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Raimondi, Franco. "Model checking multi-agent systems." Thesis, University College London (University of London), 2006. http://discovery.ucl.ac.uk/5627/.
Повний текст джерелаGonzalez, Pavel. "Model checking GSM-based multi-agent systems." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/39038.
Повний текст джерелаLu, Gehao. "Neural trust model for multi-agent systems." Thesis, University of Huddersfield, 2011. http://eprints.hud.ac.uk/id/eprint/17817/.
Повний текст джерелаRusso, Francesco. "Abstraction in model checking multi-agent systems." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9294.
Повний текст джерелаKwon, Ky-Sang. "Multi-layer syntactical model transformation for model based systems engineering." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42835.
Повний текст джерелаRajhans, Akshay H. "Multi-Model Heterogeneous Verification of Cyber-Physical Systems." Research Showcase @ CMU, 2013. http://repository.cmu.edu/dissertations/251.
Повний текст джерелаKoetje, Thabo. "Multi-objectives model predictive control of multivariable systems." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11426.
Повний текст джерелаValera, Silvia. "PELDOR in multi-spin systems : from model systems synthesis to biological applications." Thesis, University of St Andrews, 2016. http://hdl.handle.net/10023/16960.
Повний текст джерелаSun, Congcong. "Multi-layer model predictive control of complex water systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/326739.
Повний текст джерелаAquesta tesi està dedicada a dissenyar un controlador MPC multicapa que s'aplica a una complexa xarxa regional emprant com a principal idea el fet de què les diferents capes treballen amb diferents escales de temps i objectius de control s'aconseguiran amb el seu propi controlador. Un esquema jeràrquic de coordinació temporal de dues capes s'ha aplicat per a coordinar als controladors MPC per a les xarxes de captació i transport. Un enfocament integrat de simulació-optimizació que contribueix a asegurar que l'efecte de les dinàmiques complexes, millor representades pel model de simulació s'hagin tingut en compte, s'ha propostat per la gestió operacional temps real de les xarxes regionals. La segona part d'aquesta tesi es centra en el disseny d'un esquema de control que utilitza la combinació del control MPC lineal amb una problema de satisfacció de restriccions (CSP) per optimitzar el control operacional no-lineal de les xarxes d'aigua potable. El mètode d'agregació de xarxes (NAM) s'utilitza per simplificar una xarxa d'aigua complexa en una xarxa conceptual bidireccional equivalent abans d'utilitzar el CSP. L'enfocament proposat es simula utilitzant Epanet per representar el comportament hidràulic de la xarxa d'aigua potable. Finalment, el MPC no lineal s'utilitza per a la validació fent ús de l'eina PLIO per a la seva implementació. I també, un esquema de planificació de dues capes per a estacions de bombament en una aigua xarxa de distribució ha estat proposat en la segona part d'aquesta tesi. Els paràmetres d'ajust d'aquest algorisme són el período de mostreig de control de la capa inferior i el número de bombes en paral·lel en la estació de bombament.
Jennings, Joel Nicholas. "A new computational model for multi-cellular biological systems." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245334.
Повний текст джерелаMcDonald, Mercedes Terre. "OCR: A STATISTICAL MODEL OF MULTI-ENGINE OCR SYSTEMS." Master's thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4459.
Повний текст джерелаM.S.
Department of Electrical and Computer Engineering
Engineering and Computer Science
Electrical and Computer Engineering
Howell, Deborah Jane 1979. "Multi-configuration model tuning for precision opto-mechanical systems." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/16659.
Повний текст джерелаIncludes bibliographical references (p. 141-146).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
It is important for the design of future space-based observatories that simulation models physically represent the designed system and are able to track along configuration changes. This thesis outlines a three-step procedure for model tuning of complex opto-mechanical systems in the presence of measured experimental data. It is the hypothesis of this thesis that this procedure will produce a model that effectively tracks along configuration changes. The first step, engineering insight, applies model heuristics to the simulation model in an effort to produce a simulation model that includes all physical effects in the experiment. The next step, model updating, is an automated procedure whereby an optimization problem is formed in order to set uncertain model parameters. The final step is model tracking across configurations. Configuration changes include, but are not limited to, changes in mass, input/output locations, changes in geometric properties and relative placements. A new metric is provided which helps to gauge the level of experimental/model mismatch in the new configuration (using the updated model) by using the objective function from the optimization in Step 2. Using this metric, one can determine how the model changes with respect to specific configuration changes. Finally, this three-step tuning procedure is compared against traditional model tuning on a testbed at the MIT Space Systems Lab (SSL) in order to gauge its usefulness. The traditional model tuning will be performed by a colleague in the SSL who will use such methods as trial-and-error parameter updating to match the simulation model to the experimental data.
(cont.) Using the multi-configuration metric presented in this thesis, it is shown that the model produced using the three step method does track configurations better than the model produced using traditional model tuning.
by Deborah Jane Howell.
S.M.
Titman, Andrew Charles. "Model diagnostics in multi-state models of biological systems." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612189.
Повний текст джерелаJones, Andrew Vaughan. "Model checking and compositional reasoning for multi-agent systems." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/32695.
Повний текст джерелаArchila, Daniel. "Development and evaluation of a multi-objective optimization model for multi-reservoir systems." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/51894.
Повний текст джерелаApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Hashimoto, Kazumune. "Distributed Aperiodic Model Predictive Control for perturbed multi-agent systems." Thesis, KTH, Reglerteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-138441.
Повний текст джерелаDroge, Greg Nathanael. "Behavior-based model predictive control for networked multi-agent systems." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51864.
Повний текст джерелаMian, Zhibao. "Model transformation for multi-objective architecture optimisation for dependable systems." Thesis, University of Hull, 2014. http://hydra.hull.ac.uk/resources/hull:10519.
Повний текст джерелаFreitas, Artur Luiz Silva da Cunha. "Model-driven engineering of multi-agent systems based on ontology." Pontifícia Universidade Católica do Rio Grande do Sul, 2017. http://hdl.handle.net/10923/11737.
Повний текст джерелаModel-driven engineering provides abstractions and notations for improving the understanding and for supporting the modelling, coding, and verification of applications for specific domains. Ontologies, on the other hand, provide formal and explicit definitions of shared conceptualisations and enable the use of semantic reasoning. Although these areas have been developed by different communities, important synergies can be achieved when both are combined. These advantages can be explored in the development of multi-agent systems, given their complexity and the need for integrating several components that are often addressed from different angles. This work investigates how to apply ontologies for agentoriented software engineering. Initially, we present a new modelling approach where multiagent systems are designed using the proposed OntoMAS ontology. Then, we describe techniques, implemented in a tool, to help programmers bring their concepts into code and also generate code automatically from instantiated ontology models. Several advantages can be obtained from these new approaches to model and code multi-agent systems, such as semantic reasoning to carry out inferences and verification mechanisms. But the main advantage is the unified high (knowledge) level specification language that allows modelling the three dimensions that are united in the JaCaMo framework so that systems specifications can be better communicated across developing teams. The evaluations of these proposals indicate that they contribute with the different aspects of agent-oriented software engineering, such as the specification, verification, and programming of these systems.
A engenharia orientada a modelos fornece abstrações e notações para melhorar a compreensão e para apoiar a modelagem, codificação e verificação de aplicações em domínios específicos. As ontologias, por outro lado, fornecem definições formais e explícitas de conceitualizações compartilhadas e permitem o uso de raciocínio semântico. Embora essas áreas tenham sido desenvolvidas por diferentes comunidades, sinergias importantes podem ser alcançadas quando ambas são combinadas. Essas vantagens podem ser exploradas no desenvolvimento de sistemas multiagentes, dada a sua complexidade e a necessidade de integrar vários componentes que são frequentemente abordados de diferentes ângulos. Este trabalho investiga como aplicar ontologias para engenharia de software orientada a agentes. Inicialmente, apresentamos uma nova abordagem de modelagem onde os sistemas multiagentes são projetados usando a ontologia OntoMAS proposta. Então, descrevemos técnicas, implementadas em uma ferramenta, para ajudar os programadores a trazer seus conceitos em código e também gerar código automaticamente a partir de modelos instanciados da ontologia. Várias vantagens podem ser obtidas a partir dessas novas abordagens para modelar e codificar sistemas multiagentes, como o raciocínio semântico para realizar inferências e mecanismos de verificação. Mas a principal vantagem é a linguagem de especificação unificada de alto nível (conhecimento) que permite modelar as três dimensões que estão unidas em JaCaMo para que as especificações dos sistemas possam ser melhor comunicadas entre equipes em desenvolvimento. As avaliações dessas propostas indicam que elas contribuem com os diferentes aspectos da engenharia de software orientada a agentes, como a especificação, verificação e programação desses sistemas.
Jansson, Jens, Alexandar Vukosavljevic, and Ismet Catovic. "Performance comparison between multi-model, key-value and documental NoSQL database management systems." Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-19857.
Повний текст джерелаZhou, Di. "A model driven architecture based approach for developing multi-agent systems." Thesis, University of Canterbury. Computer Science and Software Engineering, 2008. http://hdl.handle.net/10092/2104.
Повний текст джерелаXu, Hao. "A semi-partitioned model for scheduling mixed criticality multi-core systems." Thesis, University of York, 2017. http://etheses.whiterose.ac.uk/18709/.
Повний текст джерелаRivotti, Pedro. "Multi-parametric programming and explicit model predictive control of hybrid systems." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/24432.
Повний текст джерелаChoi, J. "Model checking for decision making behaviour of heterogeneous multi-agent autonomous system." Thesis, Cranfield University, 2013. http://dspace.lib.cranfield.ac.uk/handle/1826/8031.
Повний текст джерелаShaw, David. "Development of a model for smart card based access control in multi-user, multi-resource, multi-level access systems." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 1999. https://ro.ecu.edu.au/theses/1229.
Повний текст джерелаYang, Ang Information Technology & Electrical Engineering Australian Defence Force Academy UNSW. "A networked multi-agent combat model : emergence explained." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Information Technology and Electrical Engineering, 2007. http://handle.unsw.edu.au/1959.4/38823.
Повний текст джерелаCordeiro, Lucas. "SMT-based bounded model checking of multi-threaded software in embedded systems." Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/186011/.
Повний текст джерелаChevet, Thomas. "Robust model predictive control for deployment and reconfiguration of multi-agent systems." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG007.
Повний текст джерелаThis thesis presents Model Predictive Control (MPC) techniques for the deployment and the reconfiguration of a dynamical Multi-Agent System (MAS) in a bounded convex two-dimensional area. A novel decentralized predictive control law for the Voronoi-based deployment of a fleet of quadrotor Unmanned Aerial Vehicles (UAVs) is derived. The proposed decentralized MPC is firstly robustified to deal with bounded deterministic perturbations acting on the agents, introducing a new box-based guaranteed Voronoi tessellation to ensure a safe deployment. In this case, a new output-feedback tube-based MPC is designed by solving constrained optimization procedures relying on linear/bilinear matrix inequalities. Secondly, to deal with unbounded stochastic perturbations, a new output-feedback chance-constrained MPC algorithm is proposed, solved by mean of a relaxation of the considered probabilistic constraints into algebraic constraints. Finally, a decentralized MPC-based reconfiguration strategy is designed to deal with the case of agents joining or leaving the multi-agent system during the deployment. Illustrative simulation results on a fleet of quadrotor UAVs validate the effectiveness of the proposed control strategies
Tinsley, Carl Terrie III. "Modeling of Multi-Pulse Transformer/Rectifier Units in Power Distribution Systems." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34655.
Повний текст джерелаMaster of Science
Jobe, Jonathan Michael. "Multi-aspect component models enabling the reuse of engineering analysis models in SysML /." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24810.
Повний текст джерелаHodge, Philip J. (Philip James), and Joshua D. Lemaitre. "A multi-echelon supply chain model for strategic inventory assessment through the deployment of kanbans." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45228.
Повний текст джерелаIncludes bibliographical references (leaves 100-102).
As global competition in the manufacturing space grows, so do corporations' needs for sophisticated and optimized management systems to enable continuous flows of information and materials across the many tiers within their supply chains. With the complexities introduced by the variability in the demand for finished goods as well as by the variability in lead-time of transportation, procurement, production and administrative activities, corporations have turned to quantitative modeling of their supply chains to address these issues. Based on the data of a heavy machinery manufacturer headquartered in the US, this research introduces a robust model for the deployment of strategic inventory buffers across a multi-echelon manufacturing system. Specifically, this study establishes a replenishment policy for inventory using a multiple bin, or Kanban, system for each part number in the assembly of products from our sponsors tractor line. We employ a numerical simulation to evaluate and optimize the various inventory deployment scenarios. Utilizing several thousand runs of the simulation, we derive a generalized treatment for each part number based on an econometric function of the parameters associated with lead-time, order frequency, inventory value and order costing. The pilot for the simulation focuses on the parts data for three earthmoving products across eight echelons, but scales to n products across m echelons. Our results show that this approach predicted the optimal quantities of Kanbans for 95% of parts to a level of accuracy +/- 3 bins.
by Philip J. Hodge and Joshua D. Lemaitre.
M.Eng.in Logistics
Pimenta, Paulo. "Application of model-driven engineering to multi-agent systems : a language to model behaviors of reactive agents." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTS031/document.
Повний текст джерелаMany users of multi-agent systems (MAS) are very commonly discouraged to model and simulate using current MAS platforms. More specifically, modeling the dynamics of a system (in particular the agent's behaviors) is very often a challenge to users of MAS. That issue is more often observed in the domain of socio-ecological systems (SES), because SES domain experts are rarely programmers. Indeed,the majority of MAS platforms were not conceived taking into consideration domain-experts that are non-programmers. Most of the current MAS tools are not dedicated to SES, or they do not possess an easily understandable formalism to represent behaviors of agents. Moreover, because it is platform-dependent, a model realized in a MAS platform cannot be properly used in another platform due to incompatibility between MAS platforms. To overcome these limitations, we propose a domain-specific language (DSL) to describe the behaviors of reactive agents, regardless of the MAS platform used for simulation. To achieve that, we applied model-driven engineering (MDE), an approach that provides tools to develop DSLs from a meta-model (abstract syntax), textual editors with syntax highlighting (for the concrete syntax) and code generation capabilities (for source-code generation of a model). As a result, we implemented a language and a textual editor that allows SES domain experts to describe behaviors in three different ways that are closed to their natural expression: as equations when they are familiar to those, as a sequence of activities close to natural language or as an activity diagram to represent decisions and a sequence of behaviors using a graphic formalism. To show the generality we also developed code generators targeting two different MAS platforms (Cormas and Netlogo). We tested the code generators by implementing two SES models with the developed DSL. The generated code was targeted for both MAS platforms (Cormas and Netlogo), and successfully simulated in one of them.We conclude that the MDE approach provides adequate tools to develop DSL and code generators to facilitate MAS modeling and simulation by non-programmers. Concerning the developed DSL, although the behavioral aspect of MAS simulation is part of the complexity of modeling in MAS, there are still other essential aspects of model and simulation of MAS that are yet to be explored, such as model's initialization and points of view on the model's simulated world
ZHU, Peihu. "An improved model for trust-aware recommender systems based on multi-faceted trust." Digital Commons @ Lingnan University, 2016. https://commons.ln.edu.hk/cds_etd/15.
Повний текст джерелаLee, Lik-hang, and 李力恆. "An agent-based model to support multi-issue negotiation in green supply chain." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/197508.
Повний текст джерелаpublished_or_final_version
Industrial and Manufacturing Systems Engineering
Master
Master of Philosophy
Ferreira, José Alexandre Pires. "Monitoring morphisms to support sustainable interoperability of enterprise systems." Master's thesis, Faculdade de Ciências e Tecnologia, 2011. http://hdl.handle.net/10362/7527.
Повний текст джерелаNowadays, organizations are required to be part of a global collaborative world. Sometimes this is the only way they can access new and wider markets, reaching new opportunities, skills and sharing assets, e.g. tools, lessons learnt. However, due to the different sources of enterprise models and semantics, organizations are experiencing difficulties in exchanging vital information via electronic and in a seamlessly way. To solve this issue, most of them try to attain interoperability by establishing peer-to-peer mappings with different business partners, or in optimized networks using neutral data standards to regulate communications. Moreover, the systems are more and more dynamic, changing frequently to answer new customer’s requirements, causing new interoperability problems and a reduction of efficiency. This dissertation proposes a multi-agent system to monitor existing enterprise systems, by being capable of detecting morphism changes. With this, network harmonization breakings are timely detected, and possible solutions are suggested to regain the interoperable status, thus enhancing robustness for reaching sustainability of business networks.
Jose, Bijoy Antony. "Formal Model Driven Software Synthesis for Embedded Systems." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/28622.
Повний текст джерелаPh. D.
Hales, Alwin Livingstone. "A model to determine optimal water management procedures for multi-variable irrigation systems." Thesis, University of Southampton, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259483.
Повний текст джерелаDas, Satyajit. "Architecture and Programming Model Support for Reconfigurable Accelerators in Multi-Core Embedded Systems." Thesis, Lorient, 2018. http://www.theses.fr/2018LORIS490/document.
Повний текст джерелаEmerging trends in embedded systems and applications need high throughput and low power consumption. Due to the increasing demand for low power computing and diminishing returns from technology scaling, industry and academia are turning with renewed interest toward energy efficient hardware accelerators. The main drawback of hardware accelerators is that they are not programmable. Therefore, their utilization can be low is they perform one specific function and increasing the number of the accelerators in a system on chip (SoC) causes scalability issues. Programmable accelerators provide flexibility and solve the scalability issues. Coarse-Grained Reconfigurable Array (CGRA) architecture consisting of several processing elements with word level granularity is a promising choice for programmable accelerator. Inspired by the promising characteristics of programmable accelerators, potentials of CGRAs in near threshold computing platforms are studied and an end-to-end CGRA research framework is developed in this thesis. The major contributions of this framework are: CGRA design, implementation, integration in a computing system, and compilation for CGRA. First, the design and implementation of a CGRA named Integrated Programmable Array (IPA) is presented. Next, the problem of mapping applications with control and data flow onto CGRA is formulated. From this formulation, several efficient algorithms are developed using internal resources of a CGRA, with a vision for low power acceleration. The algorithms are integrated into an automated compilation flow. Finally, the IPA accelerator is augmented in PULP - a Parallel Ultra-Low-Power Processing-Platform to explore heterogeneous computing
Shei, Shaun. "A model-driven approach towards designing and analysing secure systems for multi-clouds." Thesis, University of Brighton, 2018. https://research.brighton.ac.uk/en/studentTheses/53c11a93-3d8d-4cbe-82df-deb34be6ab1f.
Повний текст джерелаStein, Jacob. "Supporting feature model configuration based on multi-stakeholder preferences." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/117277.
Повний текст джерелаFeature model con guration is known to be a hard, error-prone and timeconsuming activity. This activity gets even more complicated when it involves multiple stakeholders in the con guration process. Research work has proposed approaches to aid multi-stakeholder feature model con guration, but they rely on systematic processes that constraint decisions of some of the stakeholders. In this dissertation, we propose a novel approach to improve the multi-stakeholder con guration process, considering stakeholders' preferences expressed through both hard and soft constraints. Based on such preferences, we recommend di erent product con gurations using di erent strategies from the social choice theory. Our approach is implemented in a tool named SACRES, which allows creation of stakeholder groups, speci cation of stakeholder preferences over a con guration and generation of optimal con guration. We conducted an empirical study to evaluate the e ectiveness of our strategies with respect to individual stakeholder satisfaction and fairness among all stakeholders. The obtained results provide evidence that particular strategies perform best with respect to group satisfaction, namely average and multiplicative, considering the scores given by the participants and computational complexity. Our results are relevant not only in the context software product lines, but also in the context of social choice theory, given the instantiation of social choice strategies in a practical problem.
Van, Broekhoven Scott B. (Scott Bennett). "A simplified multi-zone model for determining the placement of bio-defense sensors in large buildings." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43865.
Повний текст джерелаIncludes bibliographical references (leaves 110-112).
The anthrax mailings of 2001 increased public and government awareness to the threat of bio-terrorism. Particularly vulnerable to a bio-terrorist event are large indoor facilities such as convention centers, office buildings, transportation centers, and sports arenas with their high population densities and limited physical security. Under heightened threat levels deploying bio-aerosol sensors inside these facilities provides added protection to the occupants. The challenge is determining the number and placement of sensors needed to guarantee the detection of a release inside a particular building. The methodology proposed here aims to simplify the analysis of contamination transport within buildings and provide first-order sensing requirements for dose dependant sensors in large facilities. A reduced-order model is developed that allows buildings to be subdivided into larger sections while maintaining a higher degree of accuracy than building analysis models with the same level of granularity. The problem is formulated as a network model with the nodes representing possible sensor locations and the path lengths equal to the reduction in dose as a contaminant travels between sensor locations. Techniques borrowed from network theory are then used to determine the minimum cost set of sensors that provides full building coverage. The reduced-order model estimates sensing requirements in hours or days for problems that would take months to analyze with fine grained multi-zone models and that are too large to be considered with computational fluid dynamics. Models of an office building, a convention center, and an airport terminal are constructed and their underlying network graph is employed to understand how the structure of the indoor environment affects the placement of sensors.
(cont.) Additionally, the equations derived to formulate the network model are used to quantify the optimal tradeoff between sensor sensitivity and cost as a function of building parameters. Future efforts will continue on this path, focusing on how easily discernible building properties such as size, HVAC layout, and air exchange rates can be used to predict the sensing requirements in large indoor spaces.
by Scott B. Van Broekhoven.
S.M.
Howard, Matthew. "A MULTI-OBJECTIVE NO-REGRET DECISION MAKING MODEL WITH BAYESIAN LEARNING FOR AUTONOMOUS UNMANNED SYSTEMS." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2376.
Повний текст джерелаM.S.E.E.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering MSEE
Tlili, Olfa. "Hydrogen systems : what contribution to the energy system? Findings from multiple modelling approaches." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC083/document.
Повний текст джерелаHydrogen… This simple, very abundant element holds great promise to contribute to the transition towards a cleaner future energy system, but under which techno-economic and political conditions? This thesis is a contribution to the assessment of the hydrogen penetration feasibility into the energy system, using a multi-model approach. The focus is put on low-carbon hydrogen, obtained by electrolysis.Our multi-regional analysis on the European, American, Chinese and Japanese energy context (presenting contrasted energy challenges) show that, with the current energy policies implemented which result in a modest penetration of hydrogen into the energy system, hydrogen may achieve approximately 3% of the effort that needs to be done by the four regions, in order to limit the increase of the temperature to 2°C, compared to preindustrial levels. We highlight in this thesis that blending hydrogen with natural gas, and thereby avoiding methane leakages to a certain extent, may represent a significant contribution in achieving the carbon mitigation goals.The hydrogen market analysis has been carried out following two steps. First, each market (industrial and energy-related) was tackled aside in order to propose market entry costs considering the four energy contexts and investigate the timeframe of the market penetration potential. Then, the different hydrogen applications were examined within the overall energy system through the TIMES-PT model (for a Portugal case study), allowing to investigate the hydrogen potential for energy sector coupling. Based on this work, the markets attractiveness was evaluated: mobility (using fuel cell vehicles) appears to be the most favourable.Then, we tackled the required costs over the whole hydrogen supply chain in order to enter the mobility market.To do so, we used temporally and spatially resolved models (GLAES, EuroPower and InfraGis) starting with the production side where we studied the hydrogen potential role in providing the electricity system with flexibility and the impact of such electrolysis operation on the hydrogen generation costs in the context of high shares of renewable energies in France. Our results show that hydrogen can contribute to improve the flexibility of the electric system by allowing avoiding renewable curtailment (between 1.4 and 7.9 TWh depending on the interconnection capacity scenario) but also by taking advantage of nuclear plant available energy (thereby avoiding nuclear ramping), the latter ensuring a low carbon and low cost electricity provision. However, a special attention needs to be dedicated to the utilisation rate of the electrolyser, to keep the hydrogen production costs low enough.Last but not least, we focused on how to link the hydrogen production sites and its final use for mobility applications, the delivery infrastructure being a major issue hampering the hydrogen investments. Five transport and delivery pathways were geographically designed and economically assessed, for the French case. According to our findings, during the very first market penetration phases (1% scenario), it is more interesting to start with decentralised production that proved to be less expensive for the whole pathway at this stage
Margetts, Rebecca. "Modelling & analysis of hybrid dynamic systems using a bond graph approach." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600647.
Повний текст джерелаLydiard, John M. IV. "Multi-region capacity planning model with contracts of varying duration under uncertainty : a satellite capacity acquisition case study." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/91439.
Повний текст джерела19
"June 2014." Cataloged from PDF version of thesis.
Includes bibliographical references (pages 125-127).
This paper highlights the issues associated with and presents a modeling framework for long-term capacity planning problems constrained in a similar fashion to satellite capacity acquisition. Although ambiguities exist, the satellite capacity planning problem also contains many clearly defined constraints. In the immediate time horizon, universal satellite capacity is fixed, as satellite launches are rare, and each incremental satellite launch only marginally increases capacity. In the world of Commercial Satellite Communications (COMSATCOM), satellites have fixed coverage areas as they are typically in geo-synchronous orbit. Other military applications such as observation and satellite phone require, low-earth orbit and medium-earth orbit satellites. The contracts used to acquire satellite capacity from the commercial sector also clearly define constraints, such as start and end date, bandwidth, price per unit bandwidth and allocated satellite system, which also implies frequency and available capacity. The paper first reviews the issues involved with planning capacity acquisition, and then presents a modeling framework for developing strategies to meet criteria and minimize cost. A simulation environment is developed for testing contracts and satellites of different parameters against varying demand distributions. A dynamic program is used to solve the integer program associated with selecting satellite capacity levels to cover demand.
by John M. Lydiard, IV.
S.M.
Backer-Meurke, Henrik, and Marcus Polland. "Predicting Road Rut with a Multi-time-series LSTM Model." Thesis, Högskolan Dalarna, Institutionen för information och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:du-37599.
Повний текст джерелаOzpamukcu, Serkan. "An Assessment Of A Two-echelon Inventory System Againstalternative Systems." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613949/index.pdf.
Повний текст джерелаBhonsle, Shailendra K. "Semiorder model for temporal composition of activities from events in multi-sensory information management systems /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9963652.
Повний текст джерелаMay, Jeffrey Lee. "Developing a Multi-Objective Decision Model for Maximizing IS Security within an Organization." VCU Scholars Compass, 2008. http://scholarscompass.vcu.edu/etd/914.
Повний текст джерелаYang, Yuecheng. "Self-organization and Intervention of Nonlinear Multi-agent Systems." Doctoral thesis, KTH, Optimeringslära och systemteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-197270.
Повний текст джерелаQC 20161201