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Autonomous agent-based systems and their applications in fluid dynamics, particle separation, and co-evolving networks. / 自主個體為本系統與在流體力學、分子分離、共同演化網絡上的應用 / CUHK electronic theses & dissertations collection / Autonomous agent-based systems and their applications in fluid dynamics, particle separation, and co-evolving networks. / Zi zhu ge ti wei ben xi tong yu zai liu ti li xue, fen zi fen li, gong tong yan hua wang luo shang de ying yongJanuary 2010 (has links)
Part I deals with the simulation of fluid dynamics using the lattice-Boltzmann method. Microfluidic devices often feature two-dimensional, repetitive arrays. Flows through such devices are pressure-driven and confined by solid walls. We have defined new adaptive generalised periodic boundary conditions to represent the effects of outer solid walls, and are thus able to exploit the periodicity of the array by simulating the flow through one unit cell in lieu of the entire device. The so-calculated fully developed flow describes the flow through the entire array accurately, but with computational requirements that are reduced according to the dimensions of the array. / Part II discusses the problem of separating macromolecules like proteins or DNA coils. The reliable separation of such molecules is a crucial task in molecular biology. The use of Brownian ratchets as mechanisms for the separation of such particles has been proposed and discussed during the last decade. Pressure-driven flows have so far been dismissed as possible driving forces for Brownian ratchets, as they do not generate ratchet asymmetry. We propose a microfluidic design that uses pressure-driven flows to create asymmetry and hence allows particle separation. The dependence of the asymmetry on various factors of the microfluidic geometry is discussed. We further exemplify the feasibility of our approach using Brownian dynamics simulations of particles of different sizes in such a device. The results show that ratchet-based particle separation using flows as the driving force is possible. Simulation results and ratchet theory predictions are in excellent agreement. / Part III deals with the co-evolution of networks and dynamic models. A group of agents occupies the nodes of a network, which defines the relationship between these agents. The evolution of the agents is defined by the rules of the dynamic model and depends on the relationship between agents, i.e., the state of the network. In return, the evolution of the network depends on the state of the dynamic model. The concept is introduced through the adaptive SIS model. We show that the previously used criterion determining the critical infected fraction, i.e., the number of infected agents required to sustain the epidemic, is inappropriate for this model. We introduce a different criterion and show that the critical infected fraction so determined is in good agreement with results obtained by numerical simulations. / This thesis comprises three parts, reporting research results in Fluid Dynamics (Part I), Particle Separation (Part II) and Co-evolving Networks (Part III). / We further discuss the concept of co-evolving dynamics using the Snowdrift Game as a model paradigm. Co-evolution occurs through agents cutting dissatisfied links and rewiring to other agents at random. The effect of co-evolution on the emergence of cooperation is discussed using a mean-field theory and numerical simulations. A transition between a connected and a disconnected, highly cooperative state of the system is observed, and explained using the mean-field model. Quantitative deviations regarding the level of cooperation in the disconnected regime can be fully resolved through an improved mean-field theory that includes the effect of random fluctuations into its model. / Graeser, Oliver = 自主個體為本系統與在流體力學、分子分離、共同演化網絡上的應用 / 顧皓森. / Adviser: Hui Pak-Ming. / Source: Dissertation Abstracts International, Volume: 73-01, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (leaves 204-216). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese. / Graeser, Oliver = Zi zhu ge ti wei ben xi tong yu zai liu ti li xue, fen zi fen li, gong tong yan hua wang luo shang de ying yong / Gu Haosen.
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Análise de sistemas de comunicação para computação paralela em clusters. / Communication system analysis for cluster parallel computing.Rosa, Bruno Otto Theodoro 26 February 2002 (has links)
Apesar do aumento constante da largura de banda das tecnologias de rede de computadores as aplicações de processamento paralelo ainda necessitam de uma latência de comunicação mais baixa que a oferecida. Este aspecto não tem sido contemplado por estas tecnologias de rede pois está relacionado à maneira como o sistema operacional utiliza-se dos recursos do hardware com relação aos dados enviados pelas aplicações dos usuários. Neste trabalho apresentamos um estudo da técnica para diminuição desta latência e as características necessárias para implementação deste tipo de sistemas, incluindo mecanismos de transferência de dados, técnicas para tradução de endereços, proteção, transferência de controle, grau de confiabilidade e implementação de \"Multicasting\". Apresentamos também o estudo de um sistema já implementado, chamado M-VIA, comparando seu desempenho com o TCP/IP tradicional. / Despite the constant bandwidth increase in computer networks parallel processing tasks still require a lower communication latency than offered. This necessity has not been addressed by these network technologies because it is related to how operating systems use hardware resources to send user data through network. In this work we present strategies to lower latency and the requirements to implement these systems, including data transfer mechanisms, address translation , security, control transfer, reliability and \"Multicasting\" deployment . We also present a ready to use system, M-VIA, comparing it to traditional TCP/IP performance.
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Automatizované testování aplikace pro IP televizi / Automatized testing of application for IP televisionOudrnický, Jan January 2011 (has links)
Main goal of the thesis is to analyze current state of testing of nangu.tv system and design system for automatized testing of this application and its components. Thesis builds up theoretical framework needed for better understanding of the given area, defines specifics of the application and its development. The requirements for the given automatized system are then specified together with selecting tools for its development. Following steps also propose changes in system of testing. Thesis presents steps which are to include designed system into the current process of testing in the company. Main purpose of this work is to lay foundation for future implementation of automated testing into the process of testing to Alnair a.s. company as to improve the level of testing process in the company.
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Hypothesis, estimation, and validation of dynamic social models : energy demand modeling.Peterson, David Walter January 1975 (has links)
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. / Vita. / Bibliography: leaves 121-125. / Ph.D.
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Modern control system for artificial pancreatic β cellKoch, Kevin Paul January 1981 (has links)
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: p. B1-B4. / by Kevin Paul Koch. / M.S.
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Rocket Engine System Analysis : Vinci Engine Turbines Analysis, Volvo Aero Corp.Romanov, Artyom January 2008 (has links)
<p>Major part of the current work describes the development of the update methodology for onedimensional code (TML) currently used at Volvo Aero Corporation during turbine design process. The methodology is then applied and tried out in a general engine analysis (GESTPAN).</p>
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Echo removal by discrete generalized linear filtering.January 1969 (has links)
Based on a Ph.D. thesis in the Dept. of Electrical Engineering, 1968. / Bibliography: p.125-126.
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On reliable control system designs with and without feedback reconfigurationsJanuary 1979 (has links)
J.D. Birdwell, D.A. Castanon and M. Athans. / Bibliography: leaf 8. / Caption title. Supported in part by the Fannie and John Hertz Foundation. / NASA Ames Grant NGL-22-099-124 AFOSR Grant 77-3281
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The need for a national systems center : an ad-hoc committee reportJanuary 1978 (has links)
by Michael Athans. / Caption title. "This report summarizes the developments to date (November 1 1978) ... ." / Travel support provided in part by National Science Foundation Grant NSF/ENG77-07777
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A Critique Of World-system Inspired Historiography Of Transition To Capitalism In The Ottoman EmpireErkurt, Beyhan 01 February 2013 (has links) (PDF)
This thesis examines world-system inspired historiography on transition to capitalism in the Ottoman Empire that has been developed as a criticism of the modernization theory that was dominant in the analyses of the Ottoman transformation. It is argued that although the world system inspired analyses overcome the restrictions imposed by the modernization analyses that are based on the deficiencies of Ottoman society compared to the West, they are also crippled with their own restrictions. Considering change as a product of external dynamics, and ignoring internal relations and potentials, it commits the same mistake of regarding the &lsquo / periphery&rsquo / as stagnant and shorn of any life, dynamics for creating change and therefore history. In this perspective, the peripheral societies such as the Ottoman society do not have the potential to be the actor of change but can only be subjected to it. Therefore, it is argued that the world-system inspired accounts fall short in understanding the process of change in the Ottoman Empire and the dynamics behind it. On that account, this thesis stresses the importance of studying the uneven but mutual relations between internal and external factors in order to understand social transformations that occur in and through the social relations and contradictions. There is, therefore a need to develop an account of the transition of the Ottoman Empire to capitalism with the help of such an approach.
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