Inaug.-diss.--Berlin. / Lebenslauf.

Inaug.-diss.--Berlin. / Lebenslauf.

Thesis (MAppSc)--University of South Australia, 1998

No description available.

Tese de mestrado integrado. Engenharia Electrotécnica e de Computadores (Major Automação). Faculdade de Engenharia. Universidade do Porto. 2009

Tesis--Escuela Nacional de Ingenieros, Mexico.

O nivelamento trigonométrico com estação total é uma técnica que tem sua aplicação revigorada em situações que até pouco tempo atrás, por razões de precisão, somente podiam ser atendidas com uso de nivelamento geométrico. A NBR 13.133 inclui este tipo de nivelamento em uma única classe e estabelece tolerâncias muito altas, e por essa razão limita a sua especificação por empresas contratantes. Neste trabalho, avaliou-se a precisão do nivelamento trigonométrico usando estações totais de baixa e média precisão, comparando as diferenças de níveis obtidos por nivelamento geométrico. Na avaliação foram consideradas as influências de alguns fatores na propagação dos erros: a obtenção da altura do instrumento, os efeitos atmosférico, o posicionamento e altura dos alvos, a precisão dos equipamentos e as distâncias de visadas. Os resultados possibilitaram definir as distâncias máximas de visada nas condições avaliadas, em que alcança a tolerância do nivelamento geométrico IIN / The trigonometrical leveling with total station is a technique that has been increased in situations in that even some time, for reasons of precision, the use of the leveling was demanded. The NBR 13.133 includes this trigonometrical leveling in a single class and it establishes very high tolerances, and for that reason it limits its specification for contracting companies. The precision of the trigonometrical leveling was evaluated using total stations of low and intermediate precision, comparing the differences of levels obtained by leveling. In the evaluation the influences of some factors were considered in the propagation of the errors: the instrument height determination, the atmospheric effects, the positioning and staff height determination, the precision of the equipments and the distances of staff. The results made possible to define the sight maximum distances in the evaluated conditions, in that it reaches the IIN tolerance leveling

O nivelamento trigonométrico com estação total é uma técnica que tem sua aplicação revigorada em situações que até pouco tempo atrás, por razões de precisão, somente podiam ser atendidas com uso de nivelamento geométrico. A NBR 13.133 inclui este tipo de nivelamento em uma única classe e estabelece tolerâncias muito altas, e por essa razão limita a sua especificação por empresas contratantes. Neste trabalho, avaliou-se a precisão do nivelamento trigonométrico usando estações totais de baixa e média precisão, comparando as diferenças de níveis obtidos por nivelamento geométrico. Na avaliação foram consideradas as influências de alguns fatores na propagação dos erros: a obtenção da altura do instrumento, os efeitos atmosférico, o posicionamento e altura dos alvos, a precisão dos equipamentos e as distâncias de visadas. Os resultados possibilitaram definir as distâncias máximas de visada nas condições avaliadas, em que alcança a tolerância do nivelamento geométrico IIN / The trigonometrical leveling with total station is a technique that has been increased in situations in that even some time, for reasons of precision, the use of the leveling was demanded. The NBR 13.133 includes this trigonometrical leveling in a single class and it establishes very high tolerances, and for that reason it limits its specification for contracting companies. The precision of the trigonometrical leveling was evaluated using total stations of low and intermediate precision, comparing the differences of levels obtained by leveling. In the evaluation the influences of some factors were considered in the propagation of the errors: the instrument height determination, the atmospheric effects, the positioning and staff height determination, the precision of the equipments and the distances of staff. The results made possible to define the sight maximum distances in the evaluated conditions, in that it reaches the IIN tolerance leveling

Master of Science in Biomedical Sciences / Department of Clinical Sciences / James K. Roush / Interday and intraday stance analysis variability in dogs with hindlimb lameness Objective: The purpose of this study was to assess the same day and next-day repeatability of data collected with a Pet Safe Stance Analyzer on animals with naturally-occurring lameness presented for veterinary orthopedic examination. Our hypothesis was that dogs would show consistent repeatability with regards to body weight distribution on the Pet Safe Stance analyzer. Materials and Methods: Interday Variability Trial: Thirty-one consecutive dogs presenting for hindlimb lameness were included. The PetSafe Stance Analyzer was used with the dog standing in their natural standing position with each foot placed in its respective quadrant on the Stance Analyzer. A minimum of 5 valid measurements were collected and averaged to find the mean distribution of weight on each limb. This process was repeated the following day with the same handler and recorder. Intraday Variability Trial: Fifteen consecutive dogs were placed on the Pet Safe Stance analyzer and measurements were collected for each of 5 trials identical to the interday group. Four additional assessment trials followed with reintroduction of the animal to the room at each assessment. Results: Interday Variability Trial: There were no significant differences between Day 1 and Day 2 measured variables except for a significant increase in the Forelimb Symmetry index on Day 2 compared to Day 1. Lin’s Correlation Coefficients % body weight measured on Day 1 compared to Day 2 were significantly correlated on the lame hindlimb (0.524) and contralateral hindlimb (0.733). Intraday Variability Trial: There were no significant differences across trials for measured variables of % weight on the lame hindlimb, contralateral hindlimb, ipsilateral forelimb, or contralateral forelimb. Lin’s Correlation coefficients showed strong correlation between trials for the lame hindlimb (0.682), contralateral hindlimb (0.817), body weight (0.863), and hindlimb symmetry index (0.726). Clinical Significance: A commercial stance analyzer is a repeatable method of measurement of weight-bearing on lame hindlimbs of dogs between days and in repeated trials over one day. Day-to-day forelimb weight-bearing in dogs who are lame on a hindlimb is more variable, likely because of trial to trial changes in weight redistribution from lameness. Comparison of the effect of dog, surgeon, and TPLO surgical procedure variables on improvement of eight-week post-operative static weight-bearing Objective: To compare the effect of surgeon and tibial plateau leveling osteotomy (TPLO) procedure variations on the outcome of TPLO in naturally-occurring cranial cruciate-deficient stifles. Materials and methods: Records from 142 dogs receiving a TPLO were reviewed for information regarding surgical procedure, status of meniscus at the time of surgery, surgeon identity, ACVS diplomate or resident, meniscal release, progression of healing at the progress evaluation based on radiographic interpretation, and complications encountered. The primary outcome measure was static force on the operated limb at recheck on a PetSafe Stance Analyzer ͣ. Results: Recheck tibial plateau angle (TPA) was negatively and significantly correlated with improvement (r=-0.2132, p=0.013). Post-operative, and Recheck TPA’s were all significantly correlated with one another. The amount of TPA change from initial to immediate post-operative values was significantly correlated with the Initial TPA (r=0.628, p<0.001). Surgeon, surgical experience, arthrotomy, meniscal damage, meniscal intervention, complications, post-operative TPA, and initial TPA had no significant effect on weight-bearing at recheck. Clinical Significance: TPLO’s show improvement of 4.58% BW on the operated limb at 6-12 week rechecks on a stance analyzer. Surgeon, surgical experience, arthrotomy, meniscal damage, meniscal intervention, complications, post-operative TPA, and initial TPA have no effect on surgical outcome.

Made available in DSpace on 2016-08-29T15:33:14Z (GMT). No. of bitstreams: 1 tese_4161_.pdf: 2648809 bytes, checksum: 9d0d29882117ba5d84d7b1eb586817c2 (MD5) Previous issue date: 2011-08-04 / Sistemas Par-a-Par de Video Sob Demanda consolidaram sua importância nos últimos anos. Tal consolidação é decorrente dos elevados ganhos que se pode ter em termos de economia na banda de transmissão dos servidores. Neste trabalho, avalia-se como esta tecnologia pode potencializar os ganhos de transmissão de mídia contínua na Internet. Para atingir este objetivo, a metodologia adotada apoia-se em um ambiente de simulação a nível de pacotes que possui características que permitem capturar iferentes variáveis referentes a dinâmica da Internet, tais como: simulação completa da pilha TCP/IP, considerações sobre topologia de rede e inserção de tráfego de fundo. Na simulação foi implementado um algoritmo de difusão de vídeo P2P VoD e um algoritmo de pré-busca. As análises dos resultados apontam para uma potencial economia de upload no servidor de conteúdo de 43% em um cenário menos idealizado do que a proposta de base que atingiu 73%. Em termos da percepção da qualidade de vídeo dos clientes, o presente trabalho indica que sua experiência pode ser degradada de forma considerável usando UDP quando existe o tráfego de fundo, mesmo com a economia do servidor se mantendo constante. Ainda na percepção dos clientes, percebeu-se também que, embora o uso da pré-busca seja benéfico aos mesmos, o grande fator diferencial na melhor qualidade percebida foi a escolha da camada de transporte apropriada.