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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

Sequential convex approximations of chance constrained programming /

Yang, Yi. January 2008 (has links)
Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2008. / Includes bibliographical references (leaves 46-50). Also available in electronic version.
2

Model updating in real-time optimization /

Yip, Wai San. January 2002 (has links)
Thesis (Ph.D.) -- McMaster University, 2002. / Includes bibliographical references (leaves 163-174). Also available via World Wide Web.
3

Optimum experimental designs for models with a skewed error distribution with an application to stochastic frontier models /

Thompson, Mery H. January 2008 (has links)
Thesis (Ph.D.) - University of Glasgow, 2008. / Ph.D. thesis submitted to the Faculty of Information and Mathematical Sciences, Department of Statistics, 2008. Includes bibliographical references. Print version also available.
4

Reliability analysis and reliability-based optimal design of linear structures subjected to stochastic excitations /

Wang, Jia. January 2010 (has links)
Includes bibliographical references (p. 119-126).
5

Optimal control of piecewise continuous stochastic processes

Huang, Hui. January 1989 (has links)
Thesis--Rheinische Friedrich-Wilhelms-Universität zu Bonn. / Text in English; thesis statement and introd. in German. Includes bibliographical references (p. 93-96).
6

Performance analysis and optimization for MAC-layer IEEE 802.16e power saving mechanism /

Kong, Lei. January 2007 (has links)
Thesis (M.Phil.)--Hong Kong University of Science and Technology, 2007. / Includes bibliographical references (leaves 86-92). Also available in electronic version.
7

[en] ANALYSIS OF MEDIA E DISPERSION IN UNREPLICATED FACTORIAL EXPERIMENTS FOR THE OPTIMIZATION OF INDUSTRIAL PROCESSES / [pt] ANÁLISE DA MÉDIA E DISPERSÃO EM EXPERIMENTOS FATORIAIS NÃO REPLICADOS PARA OTIMIZAÇÃO DE PROCESSOS INDUSTRIAIS

ANTONIO FERNANDO DE CASTRO VIEIRA 20 December 2004 (has links)
[pt] Esta tese reúne as técnicas estatísticas indicadas para a modelagem da média e da dispersão das características de qualidade de processos e produtos, em experimentos fatoriais não replicados, resultando na definição de um roteiro integrado e detalhado de análise. A motivação vem de que, apesar de haver várias publicações sobre regressão linear clássica, modelos lineares generalizados (MLG), transformação da resposta e planejamento de experimentos, não existe um texto que reúna e descreva em detalhe todos os aspectos da modelagem da média e da dispersão em experimentos fatoriais. Os poucos textos sobre esse assunto não descrevem vários aspectos importantes em estudos dessa natureza, por exemplo, como são aplicados os testes de significância dos coeficientes dos MLG, e quais são as estatísticas e os gráficos indicados para verificar a adequação do modelo. Ademais, nada foi encontrado na literatura sobre a identificação de modelos em experimentos fatoriais. Todos esses aspectos são detalhados nessa tese. Uma vez construído o modelo, é mostrado como usá-lo para obter as condições ótimas de operação dos processos e produtos. Além do cumprimento desse objetivo principal, a tese traz algumas contribuições adicionais; a saber: a) aponta limitações em todos quatro métodos da literatura que se propõem a escolher a transformação mais adequada para a resposta. Esses métodos não produziram resultados satisfatórios quando houve interações significativas entre os fatores; b) propõe a utilização de métodos de transformação da resposta como fonte de indicação da função de ligação a ser usada nos modelos lineares generalizados; e c) propõe a utilização da função de log-verossimilhança para uma escolha conjunta da distribuição de probabilidade e da função de ligação, nos modelos lineares generalizados. / [en] This thesis puts together the statistical techniques indicated for modelling the mean and dispersion of quality characteristics of products and processes via unreplicated factorial experiments, resulting in the definition of an integrated and detailed script for the analysis. It was motivated by the fact that, although there are many publications about classic linear regression, generalized linear models (GLMs), response transformation and design of experiments, there is no one text which put together and describe in detail all the aspects of the modelling of the mean and the dispersion in factorial experiments. The few texts on the subject do not describe a number of important aspects in studies of this nature, e.g. how significance tests for the coefficients in GLMs should be applied and which are the statistics and plots indicated for checking model adequacy. In addition, nothing was found in the literature about model identification in factorial experiments. All these aspects are detailed in this thesis. Once the model is built, we show how to use it in order to obtain the optimal operating conditions for products and processes. Besides achieving this main objective, the thesis brings some additional contributions, namely: a) it points out limitations in all the four methods in the literature which have the purpose of selecting the most adequate transformation of the response; b) it proposes using response transformation methods as a source of indication of the link function to use in GLMs, and c) it proposes using the loglikelihood function for the joint choice of the probability distribution and of the link function in GLMs.
8

[en] PROPOSITION FOR OPTIMIZATION OF BIDDING PROCESSES IN COMPANHIA BRASILEIRA DE TRENS URBANOS - CBTU / [pt] PROPOSTA PARA OTIMIZAÇÃO DE PROCESSOS LICITATÓRIOS NA COMPANHIA BRASILEIRA DE TRENS URBANOS - CBTU

ADRIANA FONSECA LINS 07 April 2004 (has links)
[pt] Com base em alguns conceitos de planejamento, que buscam utilizar recursos materiais e humanos de forma racional e eficiente, e na Lei Nacional das Licitações, Lei 8.666/93, que normatiza as contratações feitas pelas empresas públicas, este trabalho estuda os procedimentos adotados em um processo de licitação e apresenta uma proposta para otimizar esses processos e suas consequentes contratações. Discute-se a metodologia de planejamento adaptativo, o processo de Gestão de Conhecimento e a estratégia empresarial de aperfeiçoamento de processos de modo a compor uma base teórica para dar suporte ao projeto de melhoria de desempenho e otimização dos processos licitatórios. Este trabalho analisa também as condições de aplicação da Lei 8.666/93, os procedimentos que devem ser adotados para realização de licitações e descreve os processos licitatórios de contratação de serviços, obras e fornecimento de bens da Companhia Brasileira de Trens Urbanos - CBTU, regidos pelas diretrizes da Lei 8.666/93. A partir de uma análise crítica desses processos e da Lei Nacional de Licitações, apresenta-se uma proposta para otimização desses processos. / [en] Based in some planning concepts which take advantage of human and material resources rationally and efficiently as much as on Bidding Brazilian Law, which regulates the public contracts, this work studies the procedures used in bidding processes and presents a proposition to optimize then and their contracts. This work also considers the adaptive planning methodology, the knowledge management process improvement, so that to compose a theorical base to support the performance progress and optimization of bidding processes. Finally, this work realizes a critical analysis of bidding national law and CBTU bidding processes presenting a optimization for such processes.
9

Analýza a optimalizace procesů testování SW na vybraném IT oddělení mezinárodní finanční instituce / Analysis and optimization of software testing processes at selected IT department of the international financial institution

Mrázek, Štěpán January 2014 (has links)
The topic of this thesis is an analysis of testing software processes for selected IT department in an international financial institution followed by subsequent optimization based on the identified deficiencies. The paper firstly describes the problem of software testing in general. Next part is about explanation of the concept and modeling of business processes. Second part of the thesis is about an examination of the selected development department. and it describes its applications and the present status of testing. Based on the deficiencies found during the analysis, there are described some proposals to increase effectivity of testing processes.
10

Modelo LEAN para la optimización del proceso de fabricación de bolsas plásticas en una empresa del sector de plásticos

Guillén Hernández, Katherine Liliana, Umasi Barahona, Katherine Mariela 16 October 2019 (has links)
Este trabajo presenta la situación de una empresa que se dedica a la fabricación de bolsas plásticas, la cual actualmente tiene retrasos en su producción cuya consecuencia proviene de: faltante de materias primas, productos defectuosos y reprocesados. Es por ello que, al no contar con métodos estandarizados ni herramientas en el flujo de producción, lleva consigo el retraso de los tiempos de entrega del producto al cliente, el cual fue de 41.67% entregas impuntuales en el año 2016. Mediante la aplicación de las diferentes metodologías propuestas es posible resolver las diferentes causas, con el objetivo de reducir las entregas a destiempo. Para analizar el efecto de las metodologías propuestas en la empresa, se utilizó la técnica de simulación. De lo cual, se obtuvo una reducción del índice de productos defectuosos de 18% a 10%, índice de productos reprocesados de 7% a 3% y un aumento de la exactitud de reposición de materia prima de 65% a 90%, dando así un incremento del índice de cumplimiento de plazos entregas de 58% a 95%. Asimismo, con la finalidad de determinar si el proyecto es viable y rentable, se realizó un estudio financiero considerando los costos que se deben incurrir para la realización del proyecto. En este caso, el proyecto es viable de acuerdo con el análisis económico y financiero, ya que se obtiene el Valor Actual Neto de S/36,529, la Tasa Interna de Rendimiento de 31.45% y el Periodo de Retorno de la Inversión en el sexto mes de empezado el proyecto. / This thesis presents the situation of a company that is dedicated to the manufacture of plastic bags, which currently has delays in its production whose consequence comes from: missing raw materials, defective and reprocessed products. That is why, since there are no standardized methods or tools in the production flow, it entails the delay in the delivery times of the product to the customer, which was 41.67% unpunctual deliveries in 2016. Through the application of the different proposed methodologies it is possible to solve the different causes, with the aim of reducing the deliveries at the wrong time. To analyze the effect of the methodologies proposed in the company, the simulation technique was used. Of which, a reduction of the defective products index was obtained from 18% to 10%, reprocessed products index from 7% to 3% and an increase in the replacement accuracy of raw material from 65% to 90%, thus giving an increase in the delivery deadline index from 58% to 95%. Likewise, in order to determine if the project is viable and profitable, a financial study was carried out considering the costs that must be incurred to carry out the project. In this case, the project is viable according to the economic and financial analysis, since the Net Present Value of S / 36,529, the Internal Rate of Return of 31.45% and the Return on Investment Period in the sixth month are obtained the project started. / Trabajo de Suficiencia Profesional

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