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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Feasibility Study for Wireless Control on The Countermeasure Dispenser System

Pinsuvan, Sukanya, Pinitchun, Rawin January 2012 (has links)
Electrical wiring on board aircraft has raised serious weight and safety concerns in the aerospace industry. Wires are antenna. It may also cause interference to radio-based systems on the aircraft, or, in the case of military aircraft, create a "signature" that can be detected by enemy receivers. Wireless application in avionic system helps reducing the total weight and reconfigurable of the aircraft; hence, lower the fuel costs, installation cost and maintenance costs, as well as the “signature” of the aircraft. The focus of this thesis, therefore, is to study the feasibility of different wireless standards, namely Wi-Fi, Bluetooth and ultra-wide band (UWB), on replacing the wired data connection in the EW countermeasure or chaff/flare dispenser systems. The study was constructed under the supervision of the department of Electronic Defense System, Saab AB in Järfalla, Stockholm. The discussion will be based on the resource availability, the reliability, the stability and the security of the wireless system relative to an avionic application; i.e., whether wireless links will negatively affect the overall reliability and safety of the aircrafts. Due to the theoretical studies and results from the simulation, we studied the feasibility issue and concluded that UWB is the most appropriate choice of wireless communication for non-critical aerospace applications, comparing with Wi-Fi and Bluetooth. UWB links can have reasonable immunity to interferences, low interference to other on-board wireless systems, and good security performance.
2

Mapeamento de dados genômicos usando escalonamento multidimensional / Representation of genomics data with multidimensional scaling

Espezúa Llerena, Soledad 04 June 2008 (has links)
Neste trabalho são exploradas diversas técnicas de escalonamento multidimensional (MDS), com o objetivo de estudar sua aplicabilidade no mapeamento de dados genômicos resultantes da técnica RFLP-PCR, sendo esse mapeamento realizado em espaços de baixa dimensionalidade (2D ou 3D) com o fim de aproveitar a habilidade de análise e interpretação visual que possuem os seres humanos. Foi realizada uma análise comparativa de diversos algoritmos MDS, visando sua aptidão para mapear dados genômicos. Esta análise compreendeu o estudo de alguns índices de desempenho como a precisão no mapeamento, o custo computacional e a capacidade de induzir bons agrupamentos. Para a realização dessa análise foi desenvolvida a ferramenta \"MDSExplorer\", a qual integra os algoritmos estudados e várias opções que permitem comparar os algoritmos e visualizar os mapeamentos. Á análise realizada sobre diversos bancos de dados citados na literatura, sugerem que o algoritmo LANDMARK possui o menor tempo computacional, uma precisão de mapeamento similar aos demais algoritmos, e uma boa capacidade de manter as estruturas existentes nos dados. Finalmente, o MDSExplorer foi usado para mapear um banco de dados genômicos: o banco de estirpes de bactérias fixadoras de nitrogênio, pertencentes ao gênero Bradyrhizobium, com objetivo de ajudar o especialista a inferir visualmente alguma taxonomia nessas estirpes. Os resultados na redução dimensional desse banco de dados sugeriram que a informação relevante (acima dos 60% da variância acumulada) para as regiões 16S, 23S e IGS estaria nas primeiras 5, 4 e 9 dimensões respectivamente. / In this work were studied various Multidimensional Scaling (MDS) techniques intended to apply in the mapping of genomics data obtained of RFLP-PCR technique. This mapping is done in a low dimensional space (2D or 3D), and has the intention of exploiting the visual human capability on analysis and synthesis. A comparative analysis of diverse algorithms MDS was carried out in order to devise its ubiquity in representing genomics data. This analysis covers the study of some indices of performance such as: the precision in the mapping, the computational cost and the capacity to induce good groupings. The purpose of this analysis was developed a software tool called \"MDSExplorer\", which integrates various MDS algorithms and some options that allow to compare the algorithms and to visualize the mappings. The analysis, carried out over diverse datasets cited in the literature, suggest that the algorithm LANDMARK has the lowest computational time, a good precision in the mapping, and a tendency to maintain the existing structures in the data. Finally, MDSExplorer was used to mapping a real genomics dataset: the RFLP-PRC images of a Brazilian collection of bacterial strains belonging to the genus Bradyrhizobium (known by their capability to transform the nitrogen of the atmosphere into compounds useful for the host plants), with the objective to aid the specialist to infer visually a taxonomy in these strains. The results in reduction of dimensionality in this data base, suggest that the relevant information (above 60% of variance accumulated) to the region 16S, 23S and IGS is around 5, 4 and 9 dimensions respectively.
3

Mapeamento de dados genômicos usando escalonamento multidimensional / Representation of genomics data with multidimensional scaling

Soledad Espezúa Llerena 04 June 2008 (has links)
Neste trabalho são exploradas diversas técnicas de escalonamento multidimensional (MDS), com o objetivo de estudar sua aplicabilidade no mapeamento de dados genômicos resultantes da técnica RFLP-PCR, sendo esse mapeamento realizado em espaços de baixa dimensionalidade (2D ou 3D) com o fim de aproveitar a habilidade de análise e interpretação visual que possuem os seres humanos. Foi realizada uma análise comparativa de diversos algoritmos MDS, visando sua aptidão para mapear dados genômicos. Esta análise compreendeu o estudo de alguns índices de desempenho como a precisão no mapeamento, o custo computacional e a capacidade de induzir bons agrupamentos. Para a realização dessa análise foi desenvolvida a ferramenta \"MDSExplorer\", a qual integra os algoritmos estudados e várias opções que permitem comparar os algoritmos e visualizar os mapeamentos. Á análise realizada sobre diversos bancos de dados citados na literatura, sugerem que o algoritmo LANDMARK possui o menor tempo computacional, uma precisão de mapeamento similar aos demais algoritmos, e uma boa capacidade de manter as estruturas existentes nos dados. Finalmente, o MDSExplorer foi usado para mapear um banco de dados genômicos: o banco de estirpes de bactérias fixadoras de nitrogênio, pertencentes ao gênero Bradyrhizobium, com objetivo de ajudar o especialista a inferir visualmente alguma taxonomia nessas estirpes. Os resultados na redução dimensional desse banco de dados sugeriram que a informação relevante (acima dos 60% da variância acumulada) para as regiões 16S, 23S e IGS estaria nas primeiras 5, 4 e 9 dimensões respectivamente. / In this work were studied various Multidimensional Scaling (MDS) techniques intended to apply in the mapping of genomics data obtained of RFLP-PCR technique. This mapping is done in a low dimensional space (2D or 3D), and has the intention of exploiting the visual human capability on analysis and synthesis. A comparative analysis of diverse algorithms MDS was carried out in order to devise its ubiquity in representing genomics data. This analysis covers the study of some indices of performance such as: the precision in the mapping, the computational cost and the capacity to induce good groupings. The purpose of this analysis was developed a software tool called \"MDSExplorer\", which integrates various MDS algorithms and some options that allow to compare the algorithms and to visualize the mappings. The analysis, carried out over diverse datasets cited in the literature, suggest that the algorithm LANDMARK has the lowest computational time, a good precision in the mapping, and a tendency to maintain the existing structures in the data. Finally, MDSExplorer was used to mapping a real genomics dataset: the RFLP-PRC images of a Brazilian collection of bacterial strains belonging to the genus Bradyrhizobium (known by their capability to transform the nitrogen of the atmosphere into compounds useful for the host plants), with the objective to aid the specialist to infer visually a taxonomy in these strains. The results in reduction of dimensionality in this data base, suggest that the relevant information (above 60% of variance accumulated) to the region 16S, 23S and IGS is around 5, 4 and 9 dimensions respectively.

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