A estrutura tributária brasileira proporciona uma dificuldade a mais no planejamento de redes logísticas, principalmente no caso do Imposto sobre Circulação de Mercadorias e Serviços (ICMS). A omissão do fator tributário na modelagem de redes logísticas no cenário brasileiro atual poderá resultar em cenários não ótimos, devido à marcante influência da mesma na localização das instalações e na definição dos fluxos de origem e destino. Devido aos impactos da legislação brasileira na perda de competitividade das empresas brasileiras atualmente, a Reforma Tributária se faz necessária por estas e outras razões não logísticas, alterando a forma como este imposto é cobrado. Alguns estudos foram realizados para avaliar o impacto da reforma tributária no planejamento de redes logísticas, porém o presente estudo atualizou a demanda e os custos logísticos para os valores atuais de mercado, buscando aprofundar a compreensão sobre as principais modificações da rede. Além disso, procurou-se avaliar o impacto da modificação da alíquota interna e externa na configuração de redes logísticas. Para estudar o impacto do ICMS na rede logística de uma empresa, recorreu-se ao modelo de Programação Linear Inteira Mista (PLIM). Os resultados do estudo evidenciam que a reforma tributária irá trazer melhorias significativas no aspecto de fluxo origem e destino e na localização das instalações. Porém, a estruturação da rede logística ainda irá sofrer interferência do ICMS, contribuindo assim para o aumento do Custo Brasil pela permanência do turismo fiscal. / The Brazilian tax structure provides a further difficulty in the planning of logistics networks, especially in the case of the Tax on Circulation of Goods and Services. The omission of the tax factor in modeling logistics networks in the current Brazilian scenario could result in non-optimal, due to the strong influence in the same location of facilities and on defining the flows of origin and destination. Due to the impacts of the Brazilian legislation in the loss of competitiveness of Brazilian companies currently the Tax Reform is needed for these and other logistical reasons not changing the way this tax is levied. Some studies were conducted to evaluate the impact of tax reform in the planning of logistics networks, but the present study updated the demand and logistics costs for the current market values, seeking to deepen the understanding of the main changes to the network. In addition, we sought to evaluate the impact of changes of the internal rate in the configuration of logistics networks. To study the impact of the ICMS in the logistics network of a company, we used the model of Mixed Integer Linear Programming (MILP). The study results show that tax reform will bring significant improvements in the appearance of flow origin and destination and the location of facilities. However, the structuring of the logistics network will still suffer interference from the ICMS, thus contributing to the increase in Brazil cost the tax residence of tourism.

O objetivo deste trabalho é a otimização da distribuição dos divisores de potência utilizados em redes ópticas passivas, baseados na técnica de algoritmos genéticos, onde cada divisor possui uma única entrada e diversas saídas. O cenário prático de distribuição compreende uma determinada cidade, onde as ruas são as possíveis vias e as casas ou prédios são os possíveis terminais. Partindo de um ponto inicial (OLT - Optical Line Terminator), em geral a central de distribuição, chega-se aos usuários finais (ONUs - Optical Network Units) passando pelos divisores. Observa-se que temos pelo menos um ponto inicial (OLT) e diversos pontos de chegada (as ONUs) - dependendo da quantidade de saídas que o divisor óptico possui, cada uma destas representa um possível usuário ou outro divisor. O posicionamento dos divisores de potência e os caminhos utilizados que usaremos fazem parte de nossa solução. O conjunto destes elementos forma as redes de acesso óptico passivo (PON). Aspectos importantes considerados na otimização: (i) os comprimentos dos cabos desde a OLT até as ONUs, uma vez que ocorrem maiores degradações do sinal à medida que a distância aumenta, bem como aumentam os custos de implantação em proporção direta ao comprimento utilizado; e (ii) margem de potência no enlace e (iii) custo do enlace. Durante o processo de otimização, o algoritmo genético desenvolvido propõe um novo procedimento de busca de caminho denominado nó cíclico. Os resultados obtidos foram validados por comparações obtidas manualmente em redes de menor escala. Interfaces gráficas para carregamento de mapas urbanos a partir de aplicativos como Google map foram desenvolvidas. / This study, based on a genetic algorithm, optimizes the distribution of power dividers used, in the access, by passive optical networks, where each splitter has one input and several outputs. The practical scenario of distribution includes a particular city where the streets are the possible ways and the houses or buildings are the possible terminals. Starting from the OLT (Optical Line Terminal), in general the distribution center, the end users (ONUs - Optical Network Units) are connected to the OLT by a path with power divisions. Observe that we have at least one starting point (OLT) and several points of arrival (the ONUs) - depending on the amount of the optical splitter outputs, each of these representing a user. The positioning of the OLT, ONUs and power dividers are part of the solution we are seeking for and all these elements form the access passive optical network (PON). Important aspects considered: (i) the lengths of the cables from the OLT to the ONUs, once there are more signal degradation as the distance increases, (ii) link power budget and (iii) link cost. During the optimization process, the developed genetic algorithm proposes a new procedure for finding the optimum path which is called cyclic node. The obtained results have been validated by comparison with manual optimization in a smaller scale network. Graphical interfaces have been developed for uploading city maps from aplicatives Google maps.

In this dissertation, we introduce and study robust optimization models and decomposition algorithms in order to deal with the uncertainties such as terrorist attacks, natural disasters, and uncertain demand that are becoming more and more signicant in power systems operation and planning. An optimal power grid hardening problem is presented as a defender-attacker-defender (DAD) sequential game and solved by an exact decomposition algorithm. Network topology control, which is an eective corrective measure in power systems, is then incorporated into the defender-attacker-defender model as a recourse operation for the power system operator after a terrorist attack. Computational results validate the cost-eectiveness of the novel model. In addition, a resilient distribution network planning problem (RDNP) is proposed in order to coordinate the hardening and distributed generation resource placement with the objective of minimizing the distribution system damage under uncertain natural disaster events. A multi-stage and multi-zone based uncertainty set is designed to capture the spatial and temporal dynamics of a natural disaster as an extension to the N-K worst-case network interdiction approach. Finally, a power market day-ahead generation scheduling problem, i.e., robust unit commitment (RUC) problem, that takes account of uncertain demand is analyzed. Improvements have been made in achieving a fast

Switch Nordic Green AB (Nordic Green Energy) is an energy company with about 40 employees. The customer service department is in-house and a lot of the work, by all departments, is done by programs running on remote servers.  Today most of the network traffic is through a wired local area network, although there is a wireless guest network which is very unstable. While planning a move to a smaller office the company is planning to implement a more extensive wireless local area network. This bachelor thesis will provide a basis for implementing the local area network and wireless local area network for the company's new office. The thesis will also establish the network platform for an eventual move of a department within the company located in Finland. This documentation will enable the company to save both time and money.  With a local area network, designed and implemented for the new office, the employees will have the best possibility to improve their work and it will also increase the efficiency of the company. / Switch Nordic Green AB (Nordic Green Energy) är ett elbolag med cirka 40 anställda. Kundtjänsten sköts internt och mycket av arbetet, även på de andra avdelningarna, sker mot fjärrservrar. Idag ligger majoriteten av nätverkstraffien på ett trådat lokalt nätverk, men det finns även ett trådlöst gästnätverk, som dock är väldigt instabilt. När företaget ska flytta till ett mindre kontor planerar de att implementera ett mer omfattande trådlöst nätverk. Den här kandidatexamenauppsatsen kommer användas som grund för implementationen av både trådat och trådlöst lokalt nätverk på det nya kontoret. Uppsatsen ska upprätta en nätverksplattform som kan användas vid en eventuell framtida flytt av företagets kontor i Finland. Med denna dokumentation tillgänglig kan företaget spara både tid och pengar.  Med ett lokalt nätverk som är designat och implementerat för det nya kontoret har de anställda möjlighet att förbättra sin arbetainsats och företagets effektivitet.

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Em Aprendizagem Colaborativa com Suporte Computacional (ACSC), o planejamento instrucional consiste em obter uma sequência de interações instrucionais que definem o conteúdo instrucional como a representação do que deve ser ensinado e da forma em que os participantes devem interagir, denominada informação de planejamento instrucional. O desenvolvimento, adaptação e personalização de unidades concisas de estudo compostas por recursos instrucionais e informação de planejamento instrucional, denominadas unidades de aprendizagem, envolve um processo de planejamento instrucional complexo que consome muito tempo e apresenta um conjunto de tarefas repetitivas a serem efetuadas pelos projetistas instrucionais. Neste trabalho, o planejamento instrucional em ACSC é modelado como um problema de planejamento hierárquico para dar suporte ao desenvolvimento, adaptação e personalização das unidades de aprendizagem de forma automática. A modelagem consiste na representação do domínio a ser ensinado, das caraterísticas dos estudantes e das estratégias de planejamento instrucional na linguagem do sistema JSHOP2ip, um sistema de planejamento hierárquico desenvolvido para dar solução aos problemas específicos de planejamento instrucional. Para avaliar a modelagem proposta, efetuamos o desenvolvimento de um gerador de cursos colaborativos como um serviço Web usando a modelagem proposta e o sistema JSHOP2ip, no qual foram avaliados o desempenho, a modelagem das estratégias e a saída do planejador. Além disso, para demonstrar a viabilidade do modelo proposto em situações reais, efetuamos o desenvolvimento de uma ferramenta de autoria de unidades de aprendizagem que emprega o gerador de cursos colaborativos. / In Computer Supported Collaborative Learning (CSCL), the goal of instructional design is to obtain a instructional interaction sequence that define the instructional content as a representation of what should be taught and the way in which participants must interact, called instructional planning information. The development, adaptation and personalization of basic units of study comprised of the instructional resources and instructional planning information, called units of learning, that involves a complex instructional planning process, time consuming and repetitive. In this work, the instructional design in CSCL is modeled as hierarchical planning problem to support the development, adaptation and personalization for units of learning. The modeling is the representation of the domain to be taught, the characteristics of students and instructional strategies in JSHOP2ip, an independent hierarchical planning system designed to solve problems of instructional design. To evaluate the proposed model, we developed a collaborative course generator as a Web service using the proposed model and JSHOP2ip system, upon which we evaluated the performance, modeling strategies and the output scheduler. Furthermore, to demonstrate the feasibility of the proposed model in real situations, we developed an authoring tool for units of learning employing the collaborative course generator

The purpose underpinning the study was to establish the prospect of developing a supplementary Internet-based information exchange system for the Natal Midlands Rural Development Network (MIDNET) and to propose a model of operation for the anticipated system. The study intended to propose, based on findings, steps and strategies that need to be taken on how best to integrate an Internet based information exchange system into the requirements and capacity of MIDNET members. To accomplish the objectives of the study, both primary and secondary sources of data were used. Literature on cooperation and networking and application of the Internet for information exchange networking were reviewed, analyzed and conceptualized to establish feasibility dimensions for an Internet-based information exchange system in a network environment and to plan a model of operation for the system. Original research was carried out using a self-administered questionnaire to MIDNET members during July through November 2001. Out ofthe questionnaires distributed to all 32 members, 18 (56.8%) were returned and used. Data collected was related to current information exchange activities; general information needs; availability of information resources in terms of ICTs infrastructure, organization and human resources and funding; and opinions on establishing an Internet based information exchange system. Supplementary information was also collected through observation of some aspects of the information exchange and dissemination activities of MIDNET members. Document analysis was done mainly to establish the contents ofthe information products of MIDNET members, MIDNET and interest groups of MIDNET. Based on general information needs established in the present study, MIDNET members were found to have similar objectives, activities and disciplines of work geared toward similar goals within rural development, the thematic boundary of the network. MIDNET was found to draw in, within its membership, geographical and thematic boundary, like-minded organizations and individuals that have similar information seeking behavior. Members, when motivated by five reasons, were found to exchange information using nine kinds ofcommunication media and mechanisms and 16 categories ofinformation products and activities which reflected 27 information content categories. The information products of members, MIDNET and interest groups of MIDNET were largely in the category of grey literature. Most members were found to have a good state oflCTs infrastructure in terms of owning computers, computer networks, Internet connectivity and development of Internet-based information exchange and dissemination systems. Most members do not have information support services backed by conventional information units and professionals. Ad hoc arrangements of responsibility for information work were used in most instances. Findings concerning funding infonnation exchange activities were inadequate to examine the trend in funding. Findings concerning problems and factors that impeded current information exchange activities and solutions suggested by members reflected the need to improve current communication and information delivery interfaces and to establish an Internet-based information system as a supplementary interface. Members indicated an overwhelming desire to participate in and contribute to the anticipated system, although there was a reluctance in terms of system inputs other than information. Analysis of the study findings in terms of fundamental feasibility dimensions showed that the Internet, if appropriately and effectively used, has the prospect to facilitate communication and information exchange in MIDNET by way of replicating current interfaces. The study proposes a model plan for the establishment of an Internet-based information exchange system that would suit the requirements and capacity of members. The plan is proposed based on findings of the present study and valid reflections from a review of the literature in terms of prerequisites for networking, basic requirements and general principles. Other aspects considered were models of cooperation on the Internet and methodological approaches for the development and impact assessment ofan Internet-based information exchange system in the development sector. / Thesis (M.I.S.)-University of Natal, Pietermaritzburg, 2002.

This dissertation investigates the development of new Global system for mobile communications (GSM) improvement algorithms used to solve the nondeterministic polynomial-time hard (NP-hard) problem of assigning cells to switches. The departure of this project from previous projects is in the area of the GSM network being optimised. Most previous projects tried minimising the signalling load on the network. The main aim in this project is to reduce the operational expenditure as much as possible while still adhering to network element constraints. This is achieved by generating new network configurations with a reduced transmission cost. Since assigning cells to switches in cellular mobile networks is a NP-hard problem, exact methods cannot be used to solve it for real-size networks. In this context, heuristic approaches, evolutionary search algorithms and clustering techniques can, however, be used. This dissertation presents a comprehensive and comparative study of the above-mentioned categories of search techniques adopted specifically for GSM network improvement. The evolutionary search technique evaluated is a genetic algorithm (GA) while the unsupervised learning technique is a Gaussian mixture model (GMM). A number of custom-developed heuristic search techniques with differing goals were also experimented with. The implementation of these algorithms was tested in order to measure the quality of the solutions. Results obtained confirmed the ability of the search techniques to produce network configurations with a reduced operational expenditure while still adhering to network element constraints. The best results found were using the Gaussian mixture model where savings of up to 17% were achieved. The heuristic searches produced promising results in the form of the characteristics they portray, for example, load-balancing. Due to the massive problem space and a suboptimal chromosome representation, the genetic algorithm struggled to find high quality viable solutions. The objective of reducing network cost was achieved by performing cell-to-switch optimisation taking traffic distributions, transmission costs and network element constraints into account. These criteria cannot be divorced from each other since they are all interdependent, omitting any one of them will lead to inefficient and infeasible configurations. Results obtained further indicated that the search space consists out of two components namely, traffic and transmission cost. When optimising, it is very important to consider both components simultaneously, if not, infeasible or suboptimum solutions are generated. It was also found that pre-processing has a major impact on the cluster-forming ability of the GMM. Depending on how the pre-processing technique is set up, it is possible to bias the cluster-formation process in such a way that either transmission cost savings or a reduction in inter base station controller/switching centre traffic volume is given preference. Two of the difficult questions to answer when performing network capacity expansions are where to install the remote base station controllers (BSCs) and how to alter the existing BSC boundaries to accommodate the new BSCs being introduced. Using the techniques developed in this dissertation, these questions can now be answered with confidence. / Dissertation (MEng)--University of Pretoria, 2008. / Electrical, Electronic and Computer Engineering / unrestricted

Em Aprendizagem Colaborativa com Suporte Computacional (ACSC), o planejamento instrucional consiste em obter uma sequência de interações instrucionais que definem o conteúdo instrucional como a representação do que deve ser ensinado e da forma em que os participantes devem interagir, denominada informação de planejamento instrucional. O desenvolvimento, adaptação e personalização de unidades concisas de estudo compostas por recursos instrucionais e informação de planejamento instrucional, denominadas unidades de aprendizagem, envolve um processo de planejamento instrucional complexo que consome muito tempo e apresenta um conjunto de tarefas repetitivas a serem efetuadas pelos projetistas instrucionais. Neste trabalho, o planejamento instrucional em ACSC é modelado como um problema de planejamento hierárquico para dar suporte ao desenvolvimento, adaptação e personalização das unidades de aprendizagem de forma automática. A modelagem consiste na representação do domínio a ser ensinado, das caraterísticas dos estudantes e das estratégias de planejamento instrucional na linguagem do sistema JSHOP2ip, um sistema de planejamento hierárquico desenvolvido para dar solução aos problemas específicos de planejamento instrucional. Para avaliar a modelagem proposta, efetuamos o desenvolvimento de um gerador de cursos colaborativos como um serviço Web usando a modelagem proposta e o sistema JSHOP2ip, no qual foram avaliados o desempenho, a modelagem das estratégias e a saída do planejador. Além disso, para demonstrar a viabilidade do modelo proposto em situações reais, efetuamos o desenvolvimento de uma ferramenta de autoria de unidades de aprendizagem que emprega o gerador de cursos colaborativos. / In Computer Supported Collaborative Learning (CSCL), the goal of instructional design is to obtain a instructional interaction sequence that define the instructional content as a representation of what should be taught and the way in which participants must interact, called instructional planning information. The development, adaptation and personalization of basic units of study comprised of the instructional resources and instructional planning information, called units of learning, that involves a complex instructional planning process, time consuming and repetitive. In this work, the instructional design in CSCL is modeled as hierarchical planning problem to support the development, adaptation and personalization for units of learning. The modeling is the representation of the domain to be taught, the characteristics of students and instructional strategies in JSHOP2ip, an independent hierarchical planning system designed to solve problems of instructional design. To evaluate the proposed model, we developed a collaborative course generator as a Web service using the proposed model and JSHOP2ip system, upon which we evaluated the performance, modeling strategies and the output scheduler. Furthermore, to demonstrate the feasibility of the proposed model in real situations, we developed an authoring tool for units of learning employing the collaborative course generator

Kenntnisse über das prinzipielle Verhalten der Lasten und deren Benutzung durch die Endabnehmer sind im Wesentlichen vorhanden. Viele der aktuell notwendigen Untersuchungen benötigen jedoch Zeitreihen elektrischer Lasten, sogenannte Lastgänge. Mit der Synthese von Zeitreihen elektrischer Lasten können unter Berücksichtigung verschiedenster Anforderungen Lastgänge aufgebaut werden, wobei in dieser Arbeit der Fokus auf Haushaltsabnehmer liegt. Wichtige Eingangsdaten für die Lastgangsynthese sind die technischen Kenngrößen der elektrischen Geräte und die sozialen Kennzahlen zur Benutzung der Geräte durch die Endabnehmer. Anhand dieser Eingangsdaten wird die Lastgangsynthese durchgeführt und werden Anwendungsbeispiele dargestellt. Die Entwicklung von klassischen Versorgungsnetzen hin zu aktiven Verteilungsnetzen ist bedingt durch neue Verbraucher, wie Wärmepumpen, Elektroautos, sowie vielen dezentralen Erzeugungsanlagen. Speziell die fluktuierende Einspeisung durch Photovoltaik-Anlagen ist Anlass zur Forderung nach einem Verbrauchs- und Lastmanagement. Mit dem Verbrauchsmanagement wird die Last an die Einspeisung angepasst und das Lastmanagement berücksichtigt zusätzlich die Versorgungssituation des Netzes. Für die Lastgangsynthese werden die Haushaltsgeräte in fünf Geräteklassen unterteilt, für die spezifische Kennzahlen aus technischer und sozialer Sicht angegeben werden. Diese Kennzahlen sind Leistung pro Gerät oder Energieverbrauch pro Nutzung sowie Ausstattungsgrade, Benutzungshäufigkeiten und Zeiten für das Ein- und Ausschalten der Geräte. Damit wird ein neuer Ansatz gewählt, welcher nicht mehr auf die detaillierte Beschreibung des Bewohnerverhaltens beruht, da die Datenbereitstellung dafür äußerst schwierig war und ist. Vorzugsweise in Niederspannungsnetzen sind mit synthetischen Zeitreihen umfangreiche und umfassende Untersuchungen realisierbar. Es gibt verschiedenste Möglichkeiten, die Zeitreihen zusammenzustellen. Mit Lastgängen je Außenleiter können beispielsweise unsymmetrische Zustände der Netze analysiert werden. Zudem können auch Lastgänge für Geräte bzw. Gerätegruppen erstellt werden, welche für Potenzialanalysen des Verbrauchsmanagement essenziell sind. Der wesentliche Unterschied besteht darin, dass viele Berechnungen nicht mehr auf deterministische Extremwerte beruhen, sondern die stochastischen Eigenschaften der Endabnehmer mit den resultierenden Lastgängen berücksichtigt werden. / Distributed generation and novel loads such as electric vehicles and heat pumps require the development towards active distribution networks. Load curves are needed for the appropriate design process. This thesis presents a feasible and expandable synthesis of load curves, which is performed exemplary on residential customers with a period under review of 1 year and time steps of as little as 30 s. The data is collected for up-to-date appliances and current statics examining the way of life. The main focus lies on the input data for the synthesis and distinguishes between technical and social factors. Some thirty home appliances have been analyzed and are classified into five appliance classes by incorporating switching operations and power consumptions. The active power is the key figure for the technical perspective and the data is derived from manufacturer information. For the social perspective six different customer types are defined. They differ in sizes of household and housekeeping. The social key figures are appliance penetration rate and depending on the appliance class the turn-on time, turn-off time, operating duration or cycle duration. The elaborated two-stage synthesis is efficiently implemented in Matlab®. First, artificial load curves are created for each appliance of the households under consideration of the appliance class. In the second step, the individual load curves of the appliances are combined to load curves per line conductor. The algorithms have been validated in the implementation process by retracing the input data in the load curves. Also, the feasibility of the results is shown by comparing the key figures maximum load and power consumption to data in literature. The generated load curves allow for unsymmetrical calculations of distribution systems and can be used for probabilistic investigations of the charging of electric vehicles, the sizing of thermal storage combined with heat pumps or the integration of battery storage systems. A main advantage is the possibility to estimate the likelihood of operating conditions. The enhancement to further appliances and the changeability of the input data allows for versatile further possible investigations.