Thesis (Ph.D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Mark G. Allen; Committee Member: J. Stevenson Kenney; Committee Member: Joy Laskar; Committee Member: Oliver Brand; Committee Member: Peter Hesketh.

Thesis (Ph.D)--Materials Science and Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Wong, C. P.; Committee Member: Jacob, Karl; Committee Member: Liu, M. L.; Committee Member: Tannenbaum, Rina; Committee Member: Wang, Z. L.. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 172-185).

Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 138-148).

Thesis (M.S.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 80-84). Also available on the World Wide Web.

Thesis (Ph. D.)--University of Texas at Austin, 2006. / Vita. Includes bibliographical references.

The safety braking system with the hand guard is the most important safety equipment for the user of a chainsaw. The safety system prevents serious injuries caused by a kickback. A kickback is when the running chain suddenly gets stuck e.g. by getting stuck in wood or hit a rock. Due to the potentially serious consequences of a kickback, the braking system has to fulfil strict requirements formulated by the authorities. In the present thesis, a generic analytical model of the braking system for a typical Husqvarna chainsaw is developed. The model is implemented as an Excel work sheet, which will facilitate future projects. The thesis includes sections of analytical calculations with information provided from both Catia and resources at Husqvarna. Several experiments were accomplished to strengthen and prove the analysis. The torque, index and activation force are tested. The static activation force is then completed in a simulation program to provide spread in the model. The parameters with most impact are also detected in the Excel simulation. A matrix of testing is constructed with parameters outside the tolerances for the dynamic experiment. Due to the collected data of the test, the relation between the two types of activation can be established. In comparison between samples of production with the simulation on equal numbers of 24 tests gave adifference on 4.75 % in mean value. 6 out of 32 tests could not be approved within the authorities’requirements for the acceleration with respect to the higher tolerances than production in the testing matrix. The most significant parameters for the static force were the brake spring and the angle of the knee joint. For the dynamic activation, the dimensions of the knee joint is crucial. Reasoning for errors are implemented in the discussion section e.g. the importance of data for the band. To improve the accuracy of the model a section of future work contains suggestments. One suggestion for improvement is to deliver more production values to ensure the comprehension of the experiments.

Submitted by Filipe Correia (fcorreia@fgvmail.br) on 2011-10-21T15:48:52Z No. of bitstreams: 1 Dissertação_Filipe_Correia.pdf: 336583 bytes, checksum: cc01dcd1cdf01f077f687eb2a1f68fc8 (MD5) / Approved for entry into archive by Andrea Virginio Machado (andrea.machado@fgv.br) on 2011-10-31T11:25:19Z (GMT) No. of bitstreams: 1 Dissertação_Filipe_Correia.pdf: 336583 bytes, checksum: cc01dcd1cdf01f077f687eb2a1f68fc8 (MD5) / Made available in DSpace on 2011-10-31T11:26:35Z (GMT). No. of bitstreams: 1 Dissertação_Filipe_Correia.pdf: 336583 bytes, checksum: cc01dcd1cdf01f077f687eb2a1f68fc8 (MD5) Previous issue date: 2011-07-07 / This paper aims to study the fiscal policy effects on a wide range of US macroeconomic variables. The empirical work is based upon a structural VAR with latent factors (FAVAR) and for which we develop a special identification scheme. As we estimate the factors using a principal component approach, theses estimates are very similar to observed industrial production and interest rate time series, and this is crucial for identification and instruments choice in our VAR model. Using impulse response functions we can see both production and personal consumption increase after a government expenditure exogenous shock. This effect of government expenditure is also positive among different income groups and further we find out lower classes are affected at the most after a public expenditure shock. This means this kind of consumers are probably subject to some credit rationing which difficults them to smooth consumption after an aggregate shock. / O objetivo desse artigo é analisar o impacto da política fiscal sobre diversas variáveis macroeconômicas dos EUA. A metodologia do trabalho empírico baseia-se em um modelo VAR estrutural que incorpora fatores latentes (FAVAR) e para o qual desenvolve-se um esquema de identificação específico. Visto que os fatores são estimados por principal components, estes aproximam-se muito das séries observadas de produção industrial e taxa de juros. Como será visto, este resultado é de fundamental importância para a hipótese de identificação e a escolha dos instrumentos do modelo VAR. Por meio das funções de resposta ao impulso analisa-se os efeitos de um aumento do gasto do governo sobre variáveis de produto e consumo e, por sua vez, corroborando a hipótese de que tanto o PIB quanto as despesas de consumo das famílias aumentam depois desse choque exógeno. Em particular esse efeito sobre o consumo também é verificado quando separamos os indivíduos em várias classes de acordo com renda. Olhando cuidadosamente no entanto pode-se perceber que um aumento no gasto público possui mais impacto sobre os consumidores de renda mais baixa. Ou seja, é provável que por estarem sujeitas a restrições de crédito, as classes mais baixas tem mais dificuldade em suavizar o consumo após um choque agregado.

xiii, 149 p. : ill. (some col.) / Information extraction (IE) aims to recognize and retrieve certain types of information from natural language text. For instance, an information extraction system may extract key geopolitical indicators about countries from a set of web pages while ignoring other types of information. IE has existed as a research field for a few decades, and ontology-based information extraction (OBIE) has recently emerged as one of its subfields. Here, the general idea is to use ontologies--which provide formal and explicit specifications of shared conceptualizations--to guide the information extraction process. This dissertation presents two novel directions for ontology-based information extraction in which ontologies are used to improve the information extraction process. First, I describe how a component-based approach for information extraction can be designed through the use of ontologies in information extraction. A key idea in this approach is identifying components of information extraction systems which make extractions with respect to specific ontological concepts. These components are termed "information extractors". The component-based approach explores how information extractors as well as other types of components can be used in developing information extraction systems. This approach has the potential to make a significant contribution towards the widespread usage and commercialization of information extraction. Second, I describe how an ontology-based information extraction system can make use of multiple ontologies. Almost all previous systems use a single ontology, although multiple ontologies are available for most domains. Using multiple ontologies in information extraction has the potential to extract more information from text and thus leads to an improvement in performance measures. The concept of information extractor, conceived in the component-based approach for information extraction, is used in designing the principles for accommodating multiple ontologies in an ontology-based information extraction system. / Committee in charge: Dr. Dejing Dou, Chair; Dr. Arthur Farley, Member; Dr. Michal Young, Member; Dr. Monte Westerfield, Outside Member

Com o objetivo de determinar a influência dos sistemas de produção e de alimentação sobre as características do leite, dados coletados de produtores de leite do sul do Brasil e de experimentos sobre níveis de restrição alimentar e de atendimento das exigências energéticas de vacas em lactação foram submetidos à análise de fatores principais, de correlação e médias canônicas, agrupamento e comparação de médias dos grupos. Os atributos estudados comuns em todos os sistemas foram produção leiteira diária, componentes lácteos, estabilidade do leite, peso corporal e escore de condição corporal. Na análise dos sistemas de produção, três grupos de produtores foram formados pela análise de agrupamento, com características de sistemas especializados, semi-especializados e não especializados em ambas as regiões avaliadas. Grupos de produtores especializados produziam leite em conformidade com as especificações da Instrução Normativa Nº 62. Enquanto que para os produtores da região sul do Rio Grande do Sul, as estratégias de alimentação foram determinantes para distinção entre os grupos de produtores, no extremo oeste de Santa Catarina a estrutura das propriedades foi mais determinante. Níveis de restrição severos (40 e 50%) alteraram significativamente a produção leiteira diária, os teores de proteína e lactose e a estabilidade do leite. O atendimento das exigências energéticas para vacas em lactação possui uma relação direta com a produção diária de leite, com o teor da lactose e com a estabilidade do leite. A produção leiteira, os componentes lácteos e a estabilidade do leite diferenciam-se entre os sistemas de produção e alimentação. / Aiming to determine the influence of production and feeding systems on milk characteristics, data collected from dairy producers in southern Brazil and experiments on levels of feed restriction and attendance of the energy requirements of lactating cows were subjected to principal factor, correlation and means canonical, cluster analysis and comparison of means between groups. The variables common to all systems were daily milk production, milk components contents, ethanol stability, body weight and body condition score. In the analysis of production systems, three producers groups were formed by cluster analysis, with characteristics of specialized, semi-specialized and unspecialized systems in both regions evaluated. Groups of specialized dairy farmers produced milk in accordance with Normative Instruction Nº 62. While for the producers in southern Rio Grande do Sul, the feeding strategies were crucial to distinguish groups, at the far west of Santa Catarina structure of the properties was more important. Severe feed restriction levels (40 and 50%) altered significantly the daily milk yield, protein and lactose contents and ethanol stability. Attendance of the energy requirements for lactating cows showed a direct relationship with the daily milk production, content of lactose and milk stability. Milk production, milk components and milk stability are different between production and feeding systems.