The Kentucky Mesonet is a high-density, mesoscale network of automated meteorological and climatological sensing platforms being developed across the commonwealth. Data communications, collection, processing, and delivery mechanisms play a critical role in such networks, and the World Meteorological Organization recognizes that “an observing system is not complete unless it is connected to other systems that deliver the data to the users.” This document reviews the implementation steps, decisions, and rationale surrounding communications and computing infrastructure development to support the Mesonet. A general overview of the network and technology-related research is provided followed by a review of pertinent literature related to in situ sensing network technology. Initial infrastructure design considerations are then examined followed by an in-depth review of the Mesonet communications and computing architecture. Finally, some general benefits of the Mesonet to the citizens of Kentucky are highlighted.

The objective of this dissertation is to investigate the performance of the recently proposed MIMO technology in real indoor environments based on channel measurements centered at 5.8 GHz. First, a MIMO channel measurement system is implemented based on the virtual antenna array infrastructure. This measurement testbed can acquire the wideband channel matrices of MIMO systems with arbitrary array geometries. The measurement system structure and measurement procedure are described in detail in the first part. The second part is about MIMO channel modeling. Two novel number-of-sources detection algorithms, which are more robust and suitable for practical applications than traditional methods, are proposed. The MIMO path parameters, including delay, DOA, and DOD are estimated from measured data by several estimation schemes based on the ESPRIT algorithm. The accuracies of these estimation schemes are evaluated in terms of the estimation error between the capacities of the directly measured and the reconstructed channels. Moreover, based on ray tracing and measurement results, the spherical wave model is suggested to replace conventional plane wave model in order to prevent the capacity underestimation of short-range MIMO channels. An important observation is that short-range MIMO can achieve full capacity in free space channel. A threshold distance is derived to determine whether the spherical wave model is necessary. In the final part, measurements conducted in the Residential Laboratory are used to investigate the impact of element spacing, LOS, interference, spatial correlation between the interfering and data links, and stream control. A capacity enhancement scheme, which improves the performance by adapting the element locations, is implemented using our measurement system. Finally, the performances of beam selection and antenna selection in combination with MIMO technologies are compared in both narrowband and wideband channels.

In this thesis, design and implementation of a distribution-type, voltage source converter (VSC) based static synchronous compensator (D-STATCOM) having the simplest converter and coupling transformer topologies have been carried out. The VSC STATCOM is composed of a +/- 750 kVAr full-bridge VSC employing selective harmonic elimination technique, a low-pass input filter, and a &amp / #8710 / /Y connected coupling transformer for connection to medium voltage bus. The power stage of VSC based STATCOM is composed of water-cooled high voltage IGBT modules switched at 850 Hz for the elimination of 5th, 7th, 11th, 13th, 17th, 19th, 23rd,and 25th voltage harmonics. Special care has been taken in the laminated busbar design to minimize stray inductances between power semiconductors and dc link capacitor. Reactive power control is achieved by applying the phase angle control technique. The effect of input filter on total demand distortion has been investigated theoretically by mathematical derivations. The proposed VSC STATCOM has been implemented for reactive power compensation of Coal Preparation System in Kemerk&ouml / y Thermal Power Plant. The field test results have shown the success of the implemented system in view of fast response in reactive power compensation, and minimum input current harmonic content, and compliance with the IEEE Std. 519-1992 even for the weakest power systems. The application of selective harmonic elimination technique and phase angle control to VSC STATCOM has led to optimum switching frequency and device utilization for high voltage IGBTs at the expense of slower response as compared to other PWM techniques.

Parents and children increasingly spend time living apart due to marital separation and work travel. I investigated parent--child separation in both of these contexts to find that current technologies frequently do not meet the needs of families. The telephone is easy-to-use and ubiquitous but does not provide an engaging way of communicating with children. Videochat is more emotionally expressive and has a greater potential for engagement but is difficult to set up and cannot be used by a child without the help of an adult. Both telephone and videochat fail to meet the needs of remote parenting because they focus on conversation rather than care and play activities, which are the mechanism by which parents and children build closeness. I also saw that in both types of separation the motivation to connect at times conflicted with desire to reduce disruption of the remote household. To address some of these issues, I designed a system called the ShareTable, which provides easy-to-initiate videochat with a shared tabletop activity space. After an initial lab-based evaluation confirmed the promise of this approach, I deployed the ShareTable to four households (two sets of divorced families). I collected data about the families' remote interactions before and during the deployment. Remote communication more than doubled for each of these families while using the ShareTable and I saw a marked increase in the number of communication sessions initiated by the child. The ShareTable provided benefits over previous communication systems and supported activities that are impossible with other currently available technologies. One of the biggest successes of the system was in providing an overlapped video space that families appropriated to communicate metaphorical touch and a sense of closeness. However, the ShareTable also introduced a new source of conflict for parents and challenged the families as they tried to develop practices of using the system that would be acceptable to all involved. The families' approach to these challenges as well as explicit feedback about the system informs future directions for synchronous communication systems for separated families.

Thesis (doctoral)--Technische Hochschule, Aachen, 2000. / Includes bibliographical references (p. [273]-283) and index.

M. Tech. Electrical Engineering. / Applies conditional optimisation to ML decoding of perfect STBCs, it is hypothesised that the obtained algorithms have reduced complexity and exhibit high DLP and TLP that can be exploited to map them on low-power multi-core SIMD processors, and possibly to reduce their runtimes and allow their real-time execution in a 4G wireless system.

M. Tech. Electrical Engineering / Determines whether Hidden Markov models (HMM) can be used to classify steady state visual evoked electroencephalogram signals in a BCI system. This is for the purpose of aiding disabled people in driving a wheelchair.

Thesis (M.App.Sc.) - Carleton University, 2002. / Includes bibliographical references (p. 59-63). Also available in electronic format on the Internet.

Submitted by Alberto Quialheiro de Oliveira null (beto.stanley@bol.com.br) on 2016-07-19T15:25:34Z No. of bitstreams: 1 DISSERTACAO_ALBERTO.pdf: 4270530 bytes, checksum: bf6cacf30d20ec8e3d50a33065d262a5 (MD5) / Approved for entry into archive by Ana Paula Grisoto (grisotoana@reitoria.unesp.br) on 2016-07-20T17:41:57Z (GMT) No. of bitstreams: 1 oliveira_aq_me_bauru.pdf: 4270530 bytes, checksum: bf6cacf30d20ec8e3d50a33065d262a5 (MD5) / Made available in DSpace on 2016-07-20T17:41:57Z (GMT). No. of bitstreams: 1 oliveira_aq_me_bauru.pdf: 4270530 bytes, checksum: bf6cacf30d20ec8e3d50a33065d262a5 (MD5) Previous issue date: 2016-06-10 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Neste trabalho propõe-se um modelo de leilão multiperíodo para um mercado pool do dia seguinte de sistemas hidrotérmicos, que leve em consideração as restrições intertemporais do sistema termelétrico (e.g. potência máxima disponível e limites de rampa e período mínimo de operação e desligamento) e restrições hidráulicas (e.g. defluência, volume e balanço de água, altura de queda, alturas de montante e jusante do reservatório, limites de rampa de vazão defluente e função de produção). Também foram introduzidas no modelo as restrições de rede de transmissão, tais como o balanço e limites de fluxo de potência e representação das perdas. São descritas as técnicas de linearização das funções de altura de queda líquida, função de produção e função de perdas no sistema de transmissão. O modelo proposto é formulado como um problema de programação linear inteiro-misto, tendo sido resolvido utilizando as plataformas GAMS - CPLEX e IBM ILOG CPLEX Optimization Studio. Os resultados apresentados têm como foco principal a análise do impacto das restrições hidráulicas nos preços de equilíbrio de mercado e no despacho de geração de sistemas hidrotérmicos. Mostra-se que a operação de uma cascata hidráulica para o dia seguinte é orientada com base nas ofertas fornecidas pelas companhias geradoras no mercado de energia. / This work presents a brief description of an energy market structure, as well as its agents, economic division and service and time horizon classification. The Brazilian mar-ket, single-period and multiperiod auction are also described, as much as a concise presen-tation of a hydroelectric generation system. It's proposed for a day-ahead pool market, a multiperiod auction for hydrothermal system which takes into account the intertempo-ral constraints from a thermoelectric system (e.g. maximum available power output and ramp rate limits, minimum up and down time) and hydraulic constraints (e.g. defluence, volume and water balance, net head, forebay and tailrace levels of reservoir, water release ramp rate limits and the unit performance curves). It was also associated to the problem the transmission constraints, such as balance and flow power limits and power loss. On account of being a problem with such features, the linearization techniques of the net head, unit performance curves and power loss function are described. The proposed mo-del is based on a mixed integer linear programming problem, which used the GAMS -CPLEX and IBM ILOG CPLEX Optimization Studio to its resolution. Finally there are two reported situations to analyze the impact of the hydraulic constrains on the bidding prices, as well as the in˛uence of the selling prices on the total spillage of the hydroelectric plants. The model is projected for a hydro predominance plant cascade.

[pt] A estimação dos fluxos de potência e perdas técnicas nos sistemas de subtransmissão é um grande desafio para as distribuidoras pela importância no planejamento e operação do sistema. Por isso, surge a necessidade de contar com modelos que permitam simular estas grandezas, para o adequado planejamento do sistema. Neste trabalho é proposto e implementado um modelo de estimação de fluxos de potência e perdas técnicas em um sistema de subtransmissão baseado na desagregação de potência da demanda importada da rede de transmissão. A metodologia envolve a determinação de fatores de desagregação por barra associados à importação total de potência, estimação dos fluxos de potência DC usando a matriz de sensibilidade ramo-barra caraterística da rede elétrica e, finalmente, a estimação das perdas elétricas. O sistema IEEE 24 barras foi utilizado para o caso de estudo. Neste caso, a rede elétrica de 230 kV foi tratada como a rede de transmissão e a rede de 138 kV como a rede de subtransmissão. Dados de geração e carga realistas, com base horária e ao longo de um ano, foram utilizados para estimar os parâmetros dos modelos. Para avaliar os resultados, foram utilizadas métricas estatísticas e os resultados foram comparados com um modelo puramente estatístico, que correlaciona a importação total com as potências injetadas em cada barra, os fluxos nas linhas e as perdas totais. Os resultados obtidos indicaram que o modelo proposto ganha importância quando é possível controlar algumas injeções da rede elétrica, tornando-o mais dependente da rede elétrica. / [en] The estimation of the power flows and technical losses in the subtransmission systems is a great challenge for electricity distribution companies because of their importance in the planning and operation of the system. Therefore, there is the increasing need to have models that allow to simulate these variables for the proper planning of the system. In this work, a model of estimation of power flows and technical losses in a subtransmission system is proposed and implemented; this model is based on the power disaggregation of the imported demand from the transmission network. The methodology involves the determination of buses disaggregation factors associated with total power import, estimation of DC power flows using the bus-branch sensitivity matrix of the network and finally the estimation of the electrical losses. The IEEE 24 bus system was used for this study case. In this case, the 230 kV power grid was treated as the transmission network and the 138 kV network as the subtransmission network. Realistic generation and loading data, based on hourly time and over the span of a year, were used to estimate the parameters of the models. In order to evaluate the results, statistical metrics were used and the results were compared with a purely statistical model, which correlates the total imports with the injected power in each bus, line flows and total losses. The obtained results indicate that the proposed model gains importance when it is possible to control some of the injections into the power grid, turning it more dependent of the power grid.