This research is concerned with algorithmic representation of technoeconomic growth concerning modern and next-generation telecommunications including the Internet service. The goal of this study thereof is to emphasize efforts to establish the associated forecasting and, the envisioned tasks thereof include : (i) Reviewing the technoeconomic considerations prevailing in telecommunication (telco) service industry and their implicating features; (ii) studying relevant aspects of underlying complex system evolution (akin to biological systems), (iii) pursuant co-evolution modeling of competitive business structures using dichotomous (flip-flop) states as seen in predator evolutions ; (iv) conceiving a novel algorithm based on information-theoretic principles toward technoeconomic forecasting on the basis of modified Fisher-Kaysen model consistent with proportional fairness concept of comsumers' willingness-to-pay, and (v) evaluating forecast needs on inter-office facility based congestion sensitive traffics encountered. Commensurate with the topics indicated above, necessary algorithms, analytical derivations and compatible models are proposed. Relevant computational exercises are performed with MatLab[TM] using data gathered from open-literature on the service profiles of telecommunication companies (telco); and ad hoc model verifications are performed on the results. Lastly, discussions and inferences are made with open-questions identified for further research. / by Raef Rashad Yassin. / Thesis (Ph.D.)--Florida Atlantic University, 2012. / Includes bibliography. / Mode of access: World Wide Web. / System requirements: Adobe Reader.

"This thesis explores techniques for improving the Quality of Service (QoS) driven routing of IP traffic in a Network Centric Military Communications System within an HC3 (High Capacity Communications Capability) tiered topology. In this specialized network various routing algorithms, including traditional, QoS-constrained search-based, and heuristic approaches, were evaluated. An automatic system for the probabilistic generation of appropriate networks and traffic was created for Monte Carlo simulation of the systems and testing of the various routing algorithms. A new algorithm we propose, based upon a hiercharical decomposition of routes about the minimum distance routes, is described and tested. These results provide both insight into this problem and demonstrate the possibility of highly optimized solutions without exhaustive search."

Thesis (M.S.V.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ROTCH. / Includes bibliographies. / Sculpture as process is rooted in the historical development of movement as a theme of art in general and of sculpture in particular since 1900. The impact of the industrial revolution and the subsequent scientific/technological boom moved sculpture increasingly from static to dynamic models of reality. Scientific research pushed beyond the natural limitations of the senses, expanding man's perception of reality and demanding an ever more encompassing world view. That which was previously unseen, unheard and unknown became tangible in the micro and macro perspectives of the "New Landscape" (Kepes). Change arrived with challenge - to integrate the "New Landscape" with the familiar - and accompanied by turbulent social transformation. Whether rejected or embraced, the machine became an obsessive metaphor for both human progress and destruction. As a synthesis of object and process, it catalyzed the transition from static to dynamic models of reality. The initially rough 'machine aesthetic' led to the development of kinetic sculpture and towards the integration of art, audience and environment. With the introduction of electronics and the computer, movement became less fascinating as an isolated phenomenon by gaining meaning as an integral part of a whole system. Cybernetic mechanisms - regulatory functions controlling input and output of organic and inorganic systems - became important aspects of new perception and models. Processes of communication within systems and between systems came to define a dynamic scale, inversely related, of parts to the whole. Sculpture as process, the term my thesis seeks to define and my installation to embody, generates these communication processes in the environment, materializes and records them as temporary dynamic patterns, and stores them as information in a randomly accessible memory. / by Bernd Kracke. / M.S.V.S.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING / Bibliography: leaves 89-90. / by Vincent Bouthonnier. / M.S.

Designing distributed algorithms for optimizing system-wide performances of large scale communication networks is a challenging task. The key part of this design involves a lot of combinatorial network optimization problems, which are computationally intractable in general and hard to approximate even in a centralized manner. Inspired by the seminal work of Jiang-Walrand, Markov approximation framework was proposed for synthesizing distributed algorithms for general combinatorial network optimization problems. To provide performance guarantees, convergence properties of these distributed algorithms are of significance. / First, we consider instances of the designed Markov chain over resource allocation algorithms. We focus on the convergence issues. We find several examples such that the related convergence results can be applied directly. These examples include optimal path (or tree) selection for wireline networks, optimal neighboring selection for peer-to-peer networks, and optimal channel (or power) assignment for wireless local area networks. / In this thesis, we first review Markov approximation framework and further develop this framework by studying convergence properties of distributed algorithms. These system-wide algorithms consist of the designed Markov chain and resource allocation algorithms. We concentrate on two general scenarios: the designed Markov chain over resource allocation algorithms and resource allocation algorithms over the designed Markov chain. With imprecise measurements of network parameters and without the time-scale separation assumption, we prove convergence to near-optimal solutions for both scenarios under mild conditions. Then we apply Markov approximation framework and associated convergence results to various combinatorial network optimization problems. / Second, we consider instances of resource allocation algorithms over the designed Markov chain. We focus on the system-wide performances. Two instances are investigated: cross-layer optimization for wireless networks with deterministic channel model and wireless networks with network coding. For both instances, guided by Markov approximation framework, we design distributed schemes to achieve maximum utilities. These schemes include primal-dual flow control algorithms, Markov chain based scheduling algorithms, and routing (or network coding) algorithms. Under time-dependent step sizes and update intervals, we show that these distributed schemes converge to the optimal solutions with probability one. Further, under constant step sizes and constant update intervals, we prove that these distributed schemes also converge to a bounded neighborhood of optimal solutions with probability one. These analytical results are validated by numerical results as well. / Shao, Ziyu. / Adviser: Shou Yen Robert Li. / Source: Dissertation Abstracts International, Volume: 73-03, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (leaves 134-140). / 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.

Optical buffers are essential components of future optical switches for resolving contentions among arriving packets. Currently, optical buffers are composed of Fiber Delay Lines (FDL). Unlike the conventional electronic buffer, optical buffer only has finite time resolution, which introduces a void period between two successive buffered packets. The void period leads to service interruptions and deteriorates the buffer performance. We develop a queueing system with exceptional service for the first packet in each busy period to model the buffer behavior. For the first time, the closed-form expressions of packet blocking probability and mean delay of optical buffer are derived. We show that the packet blocking probability can be minimized by finding the optimal FDL time granularity. This optimal granularity is neither sensitive to packet length distribution, nor sensitive to the buffer length, it is mainly determined by the traffic load. / Service interruption is a special case of varying service rate. A current trend in wireless communication is to enable devices to operate using many different transmission rates. This motivates us to develop the queueing models with varying service rate. We apply the continuous time Markov chain to characterize the service rate varying process, and develop a queueing system with Markov-modulated service rate. In this kind of problem, due to the complex interaction between the rate varying process and packet arrival process, it is hard to characterize the server state evolvement; this makes it difficult to get an analytical solution, even the server only has two service rates. To escape the trap, first, we develop a discrete time Markov chain to model the server state transition process, which makes our problem to be easily manipulated. Second, apart from the previous methods, we concentrate on the moments of the packet number in system. We find the recursive relationship between the moments of packet number, this fundamental relationship widely exists in the birth-death queue systems. Our results provide a new methodology to the design of communication systems with varying service rate. / This thesis is aimed to study the interaction between service interruption and the operation of communication systems, and develop analytical methods to help the design and optimization of communication systems with interrupted services. Our work are focused on two systems: optical buffer and wireless sensor network. The common ground of these two problems is they both present the features of service interruption. / Wireless sensor network is an ad hoc network consisting of hundreds of sensor nodes equipped with limited power sources, transmission range and functionality. A simple and effective way to save energy and prolong the network lifetime is to let the nodes interrupt their sensing and data transmission process, enter sleep mode randomly. However, sleep mode corresponds to low power consumption as well as to reduced network capacity, increased latency and slowed system response. We develop a queueing model with server shutting down in a varying neighborhood to model the behavior of sensor nodes, Combining the node queueing model and the network flow balance model, we construct an analytical framework to model the network performance, derive the network capacity, packet delivery delay and node responsive property. We also develop a node power consumption model, which takes the node sleep to active transition frequency into consideration. Our results demonstrate that the sleep/active dynamics produces the predominant impact on the average power consumption and packet delay, and properly choosing the time scale of sleep/active cycle is vital to design a power-efficient sensor network. / Liu Jianming. / "Apr. 2006." / Adviser: Tony Tong Lee. / Source: Dissertation Abstracts International, Volume: 67-11, Section: B, page: 6623. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references (p. 109-117). / 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, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.

Currently, optical communications plays an important role in the transmission aspect of backbone fiber networks. However, there still remain two challenges in this field: one is the bottleneck between high-capacity local area networks (LANs) and the backbone network, where the answer is the broadband optical fiber access networks; the other is the bottleneck of low-speed electrical signal processing in high capacity optical networks, where one possible solution is all-optical nonlinear signal processing. This thesis will cover both of the two topics. In the first topic, the emphasis will be put on the novel optical access network infrastructure design to improve the access network reliability and functionality as well as the reduction of system complexity. In the second topic, the focus is how to utilize the newly-emerging photonic devices or newly-designed configurations to improve the performance of current optical signal processing subsystems for applications in lightwave transmission systems. / In summary, this thesis introduces a series of novel optical access network architecture designs and transmission system technologies for optical fiber communications and discusses their feasibilities in practice from the research perspective. We hope that these proposed technologies can contribute to the further developments in this field. / In the area of broadband optical fiber access networks, two aspects are considered: survivability and monitoring function. For the first part, several new network protection schemes among various access network topologies (i.e. tree and ring) are proposed and experimentally demonstrated, which could reduce the access network cost and simplifying the operation of the access network. For the second part, an interesting in-service fault surveillance scheme in the current TDM-PON is proposed via analyzing the composite radio-frequency (RF) spectrum of the common supervisory channel at the central office (CO). Experiment proves its effectiveness with negligible influence on the signal channels. In addition, a system demonstration of the WDM-based optical broadband access network with automatic optical protection function is presented, showing the potential of WDM technologies in the broadband optical access networks. / In the area of nonlinear optical signal processing, the technology innovation is in two areas: new architecture design and the new photonic devices. For the issue of architecture design, the focus is on the Nonlinear Optical Loop Mirror (NOLM) structure. A new polarization-independent OTDM demultiplexing scheme is proposed and demonstrated by incorporating a polarization-diversity loop into a conventional NOLM, which offers stable operation using the conventional components without sacrificing the operation speed or structural simplicity. In another study the design of a novel OFSK transmitter based on phase-modulator-embedded NOLM is conceived and implemented, which features data-rate transparent, continuous tuning of the wavelength spacing and stable operation. For the aspect of new photonic devices, this thesis focuses on the applications of photonic crystal fibers (PCF). In one work, a relatively short-length of dispersion-flattened high-nonlinearity PCF (gamma=11.2 (W-km)-1, D<-1 ps/nm/km 1500-1600 nm, S<1 x 10-3 ps/km/nm2) is integrated into a dispersion-imbalanced loop mirror (DILM) to form a nonlinear intensity discriminator and its application in the nonlinear suppression of the incoherent interferometric crosstalk has been successfully demonstrated. The special characteristics of the PCF ensure a broadband signal quality improvement and make the DILM more compact and stable. In the other work, the small birefringence of this PCF helps to simply achieve the polarization-insensitive wide-band wavelength converter based on four-wave-mixing in PCF. / Wang Zhaoxin. / "September 2006." / Advisers: Chinlon Lin; Chun-Kit Chan. / Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1846. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references (p. 93-101). / 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, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstracts in English and Chinese. / School code: 1307.

Universidade Federal do Cearà / Este trabalho apresenta a concepÃÃo, projeto e implementaÃÃo de um conversor CC/CC elevador para interligar um painel fotovoltaico a um banco de ultracapacitores para armazenamento de energia em substituiÃÃo Ãs baterias automotivas convencionais. Na saÃda dos ultracapacitores utiliza-se um conversor CC/CC abaixador, que fornece essa energia a um sistema de telecomunicaÃÃo para suprimento de um transceptor monocanal visando ao atendimento do serviÃo de telefonia rural/Internet em comunidades isoladas da rede pÃblica de energia. O sistema pode suprir o serviÃo de comunicaÃÃo para uma comunidade isolada da rede de energia elÃtrica por atà trÃs horas no perÃodo noturno, quando utilizado um equipamento rÃdio com cabos, conectores e antena para transmissÃo e recepÃÃo de sinal de telefonia com potÃncia de consumo de 13 W e com radiaÃÃo solar mÃdia de 5.500 W/m2/dia. Durante o dia, a energia solar à capturada por um painel fotovoltaico e armazenada em ultracapacitores atravÃs de um conversor boost. Este conversor possibilita a carga dos ultracapacitores no ponto de mÃxima potÃncia (MPP) do painel fotovoltaico. O transceptor à ativado quando se tira o fone do gancho e a alimentaÃÃo do sistema vem do painel via ultracapacitores. Caso haja ligaÃÃes durante o dia, o painel fotovoltaico supre as necessidades do equipamento transceptor. à noite, o painel utilizado nÃo gera energia suficiente para alimentar o sistema de telecomunicaÃÃo. No perÃodo noturno, caso ocorra uma chamada telefÃnica para o sistema proposto, o transceptor serà acionado, o assinante deverà retirar o monofone do gancho do aparelho telefÃnico para realizar o atendimento. Durante essa operaÃÃo o transceptor consome aproximadamente 13 W de potÃncia, que à fornecida pelos ultracapacitores, os quais estÃo interligados atravÃs do conversor buck. O sistema proposto à controlado por um microcontrolador e um circuito de controle, que procura o ponto de mÃxima potÃncia (MPP) do painel fotovoltaico, monitora o nÃvel da tensÃo dos ultracapacitores e determina o tempo de funcionamento do conversor CC/CC, que possibilita o fornecimento de energia para o transceptor pelos ultracapacitores. / This work presents the conception, design and implementation of a DC/DC boost converter to connect a photovoltaic panel to a bank of ultracapacitors for energy storage to replace the conventional automotive batteries. In the output of ultracapacitors a DC/DC step-down converter is used. This converter provides power to a telecommunication system for the supply of a single channel transceiver with the purpose of providing the services of rural telephony and Internet in isolated communities from the public energy grid. The system can provide the communication service to a isolated community from the power grid for up to three hours at night when used with radio equipment with cables, connectors and antenna for transmitting and receiving phone signal with consumption power of 13 W and with solar radiation rate of 5.500 W/m2/day. During the day solar energy is captured by a photovoltaic panel and stored in ultracapacitors through a boost converter. This converter enables ultracapacitors to charge at the maximum power point (MPP) of the photovoltaic panel. The transceiver is activated when the phone is taken off the hook and the system power comes from the panel via ultracapacitors. If there are calls during the day, the photovoltaic panel meets the needs of the transceiver. At night, the panel used does not generate enough energy to power the telecommunication system. At night, if there is a phone call to the proposed system, the transceiver will be triggered, and the subscriber should take the handset off the hook to answer an incoming call. During this operation, the transceiver consumes approximately 13 W of power, which is provided by ultracapacitors that are interconnected through the buck converter. The proposed system is controlled by a microcontroller and a control circuit which tracks the maximum power point (MPP) of the photovoltaic panel, monitors the voltage level of ultracapacitors and determines the operating time of the DC/DC converter which enables the provision of power to the transceiver by the ultracapacitors.This work presents the conception, design and implementation of a DC/DC boost converter to connect a photovoltaic panel to a bank of ultracapacitors for energy storage to replace the conventional automotive batteries. In the output of ultracapacitors a DC/DC step-down converter is used. This converter provides power to a telecommunication system for the supply of a single channel transceiver with the purpose of providing the services of rural telephony and Internet in isolated communities from the public energy grid. The system can provide the communication service to a isolated community from the power grid for up to three hours at night when used with radio equipment with cables, connectors and antenna for transmitting and receiving phone signal with consumption power of 13 W and with solar radiation rate of 5.500 W/m2/day. During the day solar energy is captured by a photovoltaic panel and stored in ultracapacitors through a boost converter. This converter enables ultracapacitors to charge at the maximum power point (MPP) of the photovoltaic panel. The transceiver is activated when the phone is taken off the hook and the system power comes from the panel via ultracapacitors. If there are calls during the day, the photovoltaic panel meets the needs of the transceiver. At night, the panel used does not generate enough energy to power the telecommunication system. At night, if there is a phone call to the proposed system, the transceiver will be triggered, and the subscriber should take the handset off the hook to answer an incoming call. During this operation, the transceiver consumes approximately 13 W of power, which is provided by ultracapacitors that are interconnected through the buck converter. The proposed system is controlled by a microcontroller and a control circuit which tracks the maximum power point (MPP) of the photovoltaic panel, monitors the voltage level of ultracapacitors and determines the operating time of the DC/DC converter which enables the provision of power to the transceiver by the ultracapacitors.This work presents the conception, design and implementation of a DC/DC boost converter to connect a photovoltaic panel to a bank of ultracapacitors for energy storage to replace the conventional automotive batteries. In the output of ultracapacitors a DC/DC step-down converter is used. This converter provides power to a telecommunication system for the supply of a single channel transceiver with the purpose of providing the services of rural telephony and Internet in isolated communities from the public energy grid. The system can provide the communication service to a isolated community from the power grid for up to three hours at night when used with radio equipment with cables, connectors and antenna for transmitting and receiving phone signal with consumption power of 13 W and with solar radiation rate of 5.500 W/m2/day. During the day solar energy is captured by a photovoltaic panel and stored in ultracapacitors through a boost converter. This converter enables ultracapacitors to charge at the maximum power point (MPP) of the photovoltaic panel. The transceiver is activated when the phone is taken off the hook and the system power comes from the panel via ultracapacitors. If there are calls during the day, the photovoltaic panel meets the needs of the transceiver. At night, the panel used does not generate enough energy to power the telecommunication system. At night, if there is a phone call to the proposed system, the transceiver will be triggered, and the subscriber should take the handset off the hook to answer an incoming call. During this operation, the transceiver consumes approximately 13 W of power, which is provided by ultracapacitors that are interconnected through the buck converter. The proposed system is controlled by a microcontroller and a control circuit which tracks the maximum power point (MPP) of the photovoltaic panel, monitors the voltage level of ultracapacitors and determines the operating time of the DC/DC converter which enables the provision of power to the transceiver by the ultracapacitors.

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