Estratégia do planejamento e otimização de sistemas sem fio, considerando redes interferentes: abordagem baseada em cross-layer

Apesar do aumento significativo do uso de redes locais sem fio (WLAN) nos últimos anos, aspectos de projeto e planejamento de capacidade da rede são ainda sistematicamente negligenciados durante a implementação da rede. Tipicamente um projeto de rede local sem fio é feito e instalado por profissionais de rede. Esses profissionais são extremamente experientes com redes cabeadas, mas são ainda geralmente pouco experientes com redes sem fio. Deste modo, as instalações de redes locais sem fio são desvantajosas pela falta de um modelo de avaliação de desempenho e para determinar a localização do ponto de acesso (PA), além disso, fatores importantes do ambiente não são considerados no projeto. Esses fatores se tornam mais importante quando muitos pontos de acesso (PAs) são instalados para cobrir um único edifício, algumas vezes sem planejamento de freqüência. Falhas como essa podem causar interferência entre células geradas pelo mesmo PA. Por essa razão, a rede não obterá os padrões de qualidade de serviço (QoS) exigidos por cada serviço. O presente trabalho apresenta uma proposta para planejamento de redes sem fio levando em consideração a influência da interferência com o auxílio de inteligência computacional tais como a utilização de redes Bayesianas. Uma extensiva campanha de medição foi feita para avaliar o desempenho de dois pontos de acesso (PAs) sobre um cenário multiusuário, com e sem interferência. Os dados dessa campanha de medição foram usados como entrada das redes Bayesianas e confirmaram a influência da interferência nos parâmetros de QoS. Uma implementação de algoritmo genético foi utilizado permitindo uma abordagem híbrida para planejamento de redes sem fio. Como efeito de comparação para otimizar os parâmetros de QoS, de modo a encontrar a melhor distância do PA ao receptor garantindo as recomendações do International Telecomunication Union (ITU-T), a técnica de otimização por enxame de partículas foi aplicada.

Sal: uma abordagem sobre o elemento material na obra de arte

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo de controladores aplicados a inversores para UPS com operação ilhada

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudos teóricos e experimentais da operação conjunta de um supressor eletromagnético e de um filtro ativo de potência

Pós-graduação em Engenharia Elétrica - FEIS

Proposta de diretrizes embasadoras para introdução de sistemas de medição de desempenho em empresas de projetos de instalações prediais

The civil construction in Brazil has grown a lotover the last years. This has caused a greater competition between companies of the sector. A little difference in quality in service or product a company offers can determine their success in the market. There is a growing demand for tools that optimize processes and bring greater quality to each activity in these companies. Performance measurement systems make it possible to control process efficiency and effectiveness using performance indicators. Considering this need, the paper before you has the objective of creating basic guidelines to introduce performance measurement systems inbuilding installations project companies. A theoretical reference is presented to describe organizational aspects of project companies along with performance measurement systems characteristics. Using a qualitative research methodology, a study case was executed with interviews, observation and document analysis as evidence sources. In the study case, limitations where identified, such as, high degree of product and process flexibility, dependence on subjective analysis for decision making and lack of specialized information systems. Considering the theoretical reference and the study case,the proposed guidelines intend to ease and guarantee greater chances of success when implanting one of these systems

Proteção de sistemas eletricos industriais: relés e suas aplicações em subestações

Electrical installations in industries involving high currents and voltages considered. On the other side is the common appearance of electrical failures, caused by human error, defects in electrical equipment or electrical installation aging itself. These failures are varied, those with the highest rate of occurrence and cause much damage to electrical installations, are overcurrent and overvoltage. Therefore there is a need to project a system that can detect and minimize possible effects caused by faults in electrical installations industries. Protection systems in electric industries emerge as an alternative to control especially voltage and current magnitudes. Engineered based on the functions of the relays, protection systems are an indispensable tool for any industrial substation. But the project of such systems becomes increasingly more complex, due to technological development. Electrical equipment not develop at the same speed that the protective devices (relays), making it indispensable knowledge of integration of technologies

Proposta de elaboração de carta de sensibilidade ambiental aplicada a postos de combustíveis em Rio Claro-SP

Leaking of hydrocarbon in fuel underground storage tanks constitute object of concern for urban environmental management, because therefore they provoke damages to the physical, biological and socioeconomic environment. Though laws that regulate this essential activity exist, aiming at to prevent contamination with hydrocarbon, we observe that this still happens. This fact evidences that the selection of places for installation of gas stations has not considered the characteristics of the natural environment, implying in more critical consequences associated to the leaking. The objective of this work is to elaborate a chart applied to the gas stations in Rio Claro/SP. The determination of the Index of Environmental Sensitivity for elaboration of such chart was carried through breaking the selection of factors of Environmental Sensitivity of physical, biological and socioeconomic environment. The balance of these factors was given by means of Ad hoc consultation. The crossing of the information was carried through using the method of overlapping of overlays. The result is a chart that shows us areas with classes of high, middle and low Environmental Sensitivity. One gives credit that this type of material can be used as criterion in the selection of adjusted areas for installations of new gas stations and management of the already installed gas stations. The diagnosis of the current situation of the gas stations in the area and recommendations had also been elaborated.

Um estudo de novos paradigmas na realização de projetos de instalação elétrica residencial (automação)

Through awareness of new trends of consumption of the population with regard to housing, comfort, entertainment, security and sustainability, it was crafted a work that set out to study and develop the concept of home automation and how it will revolutionize the electrical installation projects and energy savings. A pre-wiring project, taking into account, basically, the installed load, is presented as a basis for comparison. The protocols for communication between intelligent devices in an automation environment, used in the work, are the X-10, LonWorks and UPnP. The home network is studied and divided into subsystems, for a better understanding, which are the lighting, audio, video and multimedia system, security, air conditioning and central vacuum system, and the idea of integrated design and system integrator is introduced, showing the change necessity in the design philosophy of electrical installations. The main means of energy savings in an automated home, such as dimerization, master off and smart meters are presented and, finally, it was concluded that there is a need to structure electrical installation projects more comprehensive with regard to home automation, in order to become more efficient and useful to users

Artista/Câmara de maravilhas

Pós-graduação em Artes - IA

Corpo híbrido: corpo cotidiano e corpo artístico na prática da performance art

Pós-graduação em Artes - IA

Novel expert system for defining power quality compensators

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Vírus mutante na paisagem de Bauru

This paper presents the work of the MutantVirus. A group which belongs to a subject extension called Public Art Projects in Bauru City from FaacUnesp. It exposes its designs, structures, approaches, procedures, results and reflections, as well as it discusses the point of a Public Art group being associated to the Public University.

Caracterização do processamento artesanal de produtos agropecuários em assentamentos rurais de Ilha Solteira-SP: das estratégias de produção à comercialização

Pós-graduação em Agronomia - FEIS

Características do aço API X70 utilizado em tubos de transporte de petróleo e gás

Having in mind that petroleum's history presents a huge growth, the exploration and production areas have been receiving lots of investments, in order to attend the increasing demand for gas and petroleum. Looking through that scenario, new technologies have been evolving in favor of discovering new natural petroleum deposits and act with effectiveness in truly deep waters without giving up the worldwide best operational security practices. The use of rigid pipes in marine installations have been rising quickly and, thanks to this reality, the many storage and pipe launching forms became study objects and are getting improved. The analysis of steel API X70 characteristics, proving that they are suitable for use in pipes developed to transport gas and petroleum is the theme of this presentation. A tensile test was conducted to determine the base metal's mechanical properties, draining's tension, traction's resistance, elasticity's modulus and maximum tension. An aspect that is concerning too is the metallographic analysis, in order to determine the studied iron's microstructure. Results of analyzes showed that the steel has high resistance, with good capacity for deformation and well defined yield point, concluding suitable for the application in question

Características do aço API X70 utilizado em tubos de transporte de petróleo e gás

Having in mind that petroleum's history presents a huge growth, the exploration and production areas have been receiving lots of investments, in order to attend the increasing demand for gas and petroleum. Looking through that scenario, new technologies have been evolving in favor of discovering new natural petroleum deposits and act with effectiveness in truly deep waters without giving up the worldwide best operational security practices. The use of rigid pipes in marine installations have been rising quickly and, thanks to this reality, the many storage and pipe launching forms became study objects and are getting improved. The analysis of steel API X70 characteristics, proving that they are suitable for use in pipes developed to transport gas and petroleum is the theme of this presentation. A tensile test was conducted to determine the base metal's mechanical properties, draining's tension, traction's resistance, elasticity's modulus and maximum tension. An aspect that is concerning too is the metallographic analysis, in order to determine the studied iron's microstructure. Results of analyzes showed that the steel has high resistance, with good capacity for deformation and well defined yield point, concluding suitable for the application in question