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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

Improvement of Routine Test Process of High Voltage Power Capacitors

Vennerberg, Patrik January 2009 (has links)
The capacitor test process at ABB Capacitors in Ludvika must be improved to meet future demands for high voltage products. To find a solution to how to improve the test process, an investigation was performed to establish which parts of the process are used and how they operate. Several parts which can improves the process were identified. One of them was selected to be improved in correlation with the subject, mechanical engineering. Four concepts were generated and decision matrixes were used to systematically select the best concept. By improving the process several benefits has been added to the process. More units are able to be tested and lead time is reduced. As the lead time is reduced the cost for each unit is reduced, workers will work less hours for the same amount of tested units, future work to further improve the process is also identified. The selected concept was concept 1, the sway stop concept. This concept is used to reduce the sway of the capacitors as they have entered the test facility, the box. By improving this part of the test process a time saving of 20 seconds per unit can be achieved, equivalent to 7% time reduction. This can be compared to an additional 1400 units each year.
2

A Decision Matrix Based Method For Determining Priorities Of Quality Improvement Projects In Manufacturing With Inspection Error And Rework

Dolgun, Leman Esra 01 December 2006 (has links) (PDF)
Today&rsquo / s competitive environments and heightened expectation of customers make it necessary to improve quality of products and processes continuously. Therefore, quality improvement is a major concern for companies. Determining improvement priorities for not only long but also short term bottom line results is a key problem in quality improvement management. In this thesis a practical decision matrix based method is developed for selecting quality improvement projects by considering throughput and quality loss in manufacturing environments with inspection error and rework. Performance of the proposed method under different experimental conditions is analyzed and results are discussed.
3

Development and Simulation of Suspension system for L7e European car

Rudrakanth Thota Sadashiva, Rudrakanth, Gowtham Ramaswamy, Gowtham January 2016 (has links)
Suspension system is one of the most important subsystems in any automobile.An ideal system serves the occupant with comfort, minimal road disturbance, and thedriver with steer control and maneuverability.In the process of developing an ideal system, all the existing suspension systemsare reviewed by Pro-con analysis method, and McPherson suspension system is drawnout as most suitable system for Uniti car, as worked out from Pugh’s decision matrix.House of Quality is built to list out and prioritize technical specifications, userrequirements/ expectations for L7e car’s suspension. Quality Function Deploymentalso helped us to evaluate competitor strengths and weaknesses. The results obtainedfrom QFD is used as database to modify the existing predesigned McPhersonsuspension template that is available in ADAMS/Car 2015.1.0. Once the system wasmodified in the way it could fit the dimensions of Uniti car, it is tested and simulatedon test rig, whose results were out in the form of graphical plots between variousimportant suspension parameters.Parallel wheel travel, Opposite wheel travel, and Brake pull analysis are thetests conducted during simulation, whose results reveals that the modified suspensionsystem works efficiently for maximum working load and is stable on road to maneuvers.
4

Data Processing and Collection in Distributed Systems

Andersson, Sara January 2021 (has links)
Distributed systems can be seen in a variety of applications that is in use today. Tritech provides several systems that to some extent consist of distributed systems of nodes. These nodes collect data and the data have to be processed. A problem that often appears when designing these systems, is deciding where the data should be processed, i.e., which architecture is the most suitable one for the system. Decide the architecture for these systems are not simple, especially since it changes rather quickly due to the development in these areas. The thesis aims to perform a study regarding which factors affect the choice of architecture in a distributed system and how these factors relate to each other. To be able to analyze which factors do affect the choice of architecture and to what extent, a simulator was implemented. The simulator received information about the factors as input, and return one or several architecture configurations as output. By performing qualitative interviews, the input factors to the simulator were chosen. The factors that were analyzed in the thesis was: security, storage, working memory, size of data, number of nodes, data processing per data set, robust communication, battery consumption, and cost. From the qualitative interviews as well as from the prestudy five architecture configuration was chosen. The chosen architectures were: thin-client server, thick-client server, three-tier client-server, peer-to-peer, and cloud computing. The simulator was validated regarding the three given use cases: agriculture, the train industry, and industrial Internet of Things. The validation consisted of five existing projects from Tritech. From the results of the validation, the simulator produced correct results for three of the five projects. By using the simulator results, it could be seen which factors affect the choice of architecture more than others and are hard to provide in the same architecture since they are conflicting factors. The conflicting factors were security together with working memory and robust communication. The factor working memory together with battery consumption also showed to be conflicting factors and is hard to provide within the same architecture. Therefore, according to the simulator, it can be seen that the factors that affect the choice of architecture were working memory, battery consumption, security, and robust communication. By using the results of the simulator, a decision matrix was designed whose purpose was to facilitate the choice of architecture. The evaluation of the decision matrix consisted of four projects from Tritech including the three given use cases: agriculture, the train industry, and industrial Internet of Things. The evaluation of the decision matrix showed that the two architectures that received the most points, one of the architectures were used in the validated project. / Distribuerade system kan ses i en mängd olika applikationer som används idag. Tritech jobbar med flera produkter som till viss del består av distribuerade system av noder. Det dessa system har gemensamt är att noderna samlar in data och denna data kommer på ett eller ett annat sätt behöva bearbetas. En fråga som ofta behövs besvaras vid uppsättning av arkitekturen för sådana projekt är huruvida datan ska bearbetas, d.v.s. vilken arkitektkonfiguration som är mest lämplig för systemet. Att ta dessa beslut har visat sig inte alltid vara helt simpelt, och det ändrar sig relativt snabbt med den utvecklingen som sker på dessa områden. Denna uppsats syftar till att utföra en studie om vilka faktorer som påverkar valet av arkitektur för ett distribuerat system samt hur dessa faktorer förhåller sig mot varandra. För att kunna analysera vilka faktorer som påverkar valet av arkitektur och i vilken utsträckning, implementerades en simulator. Simulatorn tog faktorerna som input och returnerade en eller flera arkitekturkonfigurationer som output. Genom att utföra kvalitativa intervjuer valdes faktorerna till simulatorn. Faktorerna som analyserades i denna uppsats var: säkerhet, lagring, arbetsminne, storlek på data, antal noder, databearbetning per datamängd, robust kommunikation, batteriförbrukning och kostnad. Från de kvalitativa intervjuerna och från förstudien valdes även fem stycken arkitekturkonfigurationer. De valda arkitekturerna var: thin-client server, thick-client server, three-tier client-server, peer-to-peer, och cloud computing. Simulatorn validerades inom de tre givna användarfallen: lantbruk, tågindustri och industriell IoT. Valideringen bestod av fem befintliga projekt från Tritech. Från resultatet av valideringen producerade simulatorn korrekta resultat för tre av de fem projekten. Utifrån simulatorns resultat, kunde det ses vilka faktorer som påverkade mer vid valet av arkitektur och är svåra att kombinera i en och samma arkitekturkonfiguration. Dessa faktorer var säkerhet tillsammans med arbetsminne och robust kommunikation. Samt arbetsminne tillsammans med batteriförbrukning visade sig också vara faktorer som var svåra att kombinera i samma arkitektkonfiguration. Därför, enligt simulatorn, kan det ses att de faktorer som påverkar valet av arkitektur var arbetsminne, batteriförbrukning, säkerhet och robust kommunikation. Genom att använda simulatorns resultat utformades en beslutsmatris vars syfte var att underlätta valet av arkitektur. Utvärderingen av beslutsmatrisen bestod av fyra projekt från Tritech som inkluderade de tre givna användarfallen: lantbruk, tågindustrin och industriell IoT. Resultatet från utvärderingen av beslutsmatrisen visade att de två arkitekturerna som fick flest poäng, var en av arkitekturerna den som användes i det validerade projektet
5

En förstudie av alternativa saltbehandlingar. / A prestudy of alternative salt treatments

Bark, Johannes, Forsberg, Hannes January 2021 (has links)
Företaget Nobel Biocare tillverkar tandimplantat. Då tandimplantat används i munnen är den medicinska nivån hög och strikt. För att benet runt implantatet ska läka snabbare används en saltlösning på tandimplantaten. Saltlösningen appliceras i nuläget genom ett saltbad och sen ett justeringssteg för att avlägsna överflödigt salt. Detta arbete är en förstudie för att hitta en eller flera metoder som skulle kunna lösa denna process på ett enklare sätt.En fördjupad undersökning av sprayningsmetoder, sköljlackering samt physical vapor deposition gjordes för att finna eventuellt fungerande lösningar. Slutligen utvärderades dessa metoder för att föreslå en kandidat för prototypstudier. / The Company Nobel Biocare is a producer of dental implants. As implants are used in the mouth the medical restrictions are high. A saline solution is used to help the bone around the implants heal faster. The saline solution is currently applied using a salt bath followed by an adjustment step to remove superfluous salt.This report describes a pre-study to find one or more methods that could simplify the salt application. The focus was on spraying methods, flow coating and physical vapor deposition. Finally, a ranking was done to suggest the top candidate for prototype testing.
6

Aplicação da matriz de decisão na análise técnica e econômica para investimentos na modernização de redes de distribuição /

Bernardelli, Walter Henrique January 2017 (has links)
Orientador: Dionízio Paschoareli Júnior / Resumo: Este trabalho apresenta um método que visa possibilitar a gestão do aparente impasse envolvendo três agentes do setor elétrico. A Distribuidora de Energia que visa lucros, o Regulador que impõe às Distribuidoras, metas permanentes de melhor desempenho juntamente com viés de redução das tarifas e o Consumidor que deseja qualidade de fornecimento de energia e tarifas justas. Este método possibilita identificar e priorizar com precisão qual circuito de um sistema elétrico é mais adequado para os investimentos em melhoria de desempenho, quantificar o ganho de qualidade após as melhorias e avaliar técnica e economicamente se o benefício obtido em melhoria de qualidade produzirá retorno financeiro para remunerar o investimento. Para o desenvolvimento deste método, os dados de desempenho do sistema elétrico foram tratados estatisticamente para identificar quais ocorrências podem ser mitigadas com ações da distribuidora. Foi desenvolvida uma matriz de decisão multiatributos, referenciada pelos parâmetros de desempenho do sistema elétrico, para possibilitar a ordenação das regiões elétricas prioritárias para investimentos em melhorias. As ações técnicas de melhorias consideram a utilização de redes compactas e através de medições de desempenho destas redes e a comparação com o desempenho de redes nuas, foi possível estabelecer o potencial de redução do número de ocorrências após a implantação. Foi estabelecido critérios para identificar a taxa de melhoria de desempenho, que estabelece... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: This paper presents a methodology which supports the management of this apparent impasse involving three electricity sector agents. The Utility Company which focus on profit, the Regulator that imposes on Distributors permanent goals of better performance together with tariff reduction biases, and the Consumer who seeks for quality of energy supply and fair tariffs. This method makes it possible to accurately identify and prioritize which circuit of an electrical system is most appropriate for investments in performance improvement and to technically and economically evaluate whether the benefit obtained in quality improvement will yield financial return for the investment. For the development of this method, the performance data of the electrical system was treated statistically to identify which occurrences could be mitigated by distributor actions. A multi-attribute decision matrix was developed, supported by the performance parameters of the electric system, to enable the ordering of the priority electric regions for investments in improvements. The technical actions of improvements consider the use of spacer cable system. Through performance measurements of these networks, it was possible to establish the potential of reducing the number of occurrences after the implantation. To identify the rate of performance improvement a criterion has been established which establishes the correlation between the modernized network extension and the reduction of the number of occurre... (Complete abstract click electronic access below) / Doutor
7

Volba strategické varianty v organizaci Bohemians 1905, a. s. / Selecting strategic option in the organization of Bohemians 1905, a.s.

Valášek, Martin January 2011 (has links)
The aim of this thesis is to analyze a management problem in the organization Bohemians 1905, a.s. and submit recommendations to the board of the club for strategic choice options how to solve the management problem. The correct formulation of the problem will need to be analyze the current situation, put it in a strategic context and find the cause of the problem. This is done by Kepner-Tregoe methodology, C-E diagram and cognitive map. It will also need to develop objective solutions, design criteria, specify the possible solutions and determine the consequences of various options due to the proposed set of criteria. This is done by the value tree, a combination of multi-criteria evaluation under risk and certainty, probability trees and decision matrices. As a form of multi-criteria evaluation will be used in a specific form of the transfer bridge in the form of aggregated criteria of price/performance ratio of the options that allows create a list of preferred options.
8

Využití metod manažerského rozhodování při zavádění nového produktu na trhu bezpečnostních služeb / Use of Methods of Managerial Decision-Making in Introducing a new Product in the Market of Security Services

Brož, Jan January 2014 (has links)
The aim of the thesis is to evaluate the suitability of methods of managerial decision-making in practice. The thesis highlights the diversity of selected methods, particularly in relation to the use of discrete and continuous risk factors. The methods are applied to the case of the introduction of new product in the market of commercial security services. The thesis includes a complete strategic planning cycle based on the defined objectives of the organization, security agency SECURE. From the analytical part, including the analysis of the competitive environment 5F, through the creation of strategies, author proceeds to an implementation part which is the essence of the thesis. It is represented by managerial decision-making under risk and uncertainty, particularly decision matrix and the method of Monte Carlo. The conclusion contains evaluation and comparison of different methods and their contribution to practical use.
9

Интеллектуальный анализ данных при принятии решений импортозамещения средств виртуализации (на примере ЕИВЦ СП ГВЦ филиала ОАО «РЖД») : магистерская диссертация / Intelligent data analysis when making decision on the import substitution of virtualization tools (be the example of the EISC SP MCC branch of JSC Russian Railways)

Медовщиков, И. А., Medovschikov, I. A. January 2019 (has links)
В работе проанализированы вопросы импортозамещения программного обеспечения в России в теоретическом и практическом значении. Предложена матрица принятия решения импортозамещения виртуализации ИТ-инфраструктуры на основе лабораторного тестирования в Екатеринбургском информационном-вычислительном центре структурном подразделении Главного вычислительного центра – филиала ОАО «РЖД» (ЕИВЦ СП ГВЦ филиала ОАО «РЖД») как типового структурного подразделения Холдинга «РЖД». / The paper analyzes the issues of software import substitution in Russia in theoretical and practical terms. A matrix has been proposed for deciding on the import substitution of IT infrastructure virtualization based on laboratory testing at the Yekaterinburg Information and Computing Center, a structural subdivision of the Main Computing Center, a branch of Russian Railways (EISC SP MCC branch of Russian Railway) as a typical structural unit of Russian Railway Holding.
10

Metodologia para o cálculo da pegada hídrica ecotoxicológica de produtos dentro de uma perspectiva de ACV com uso do GIS: estudo piloto para o etanol hidratado / Methodology for the calculation of water ecotoxicity footprint of products within a LCA perspective and GIS use. Pilot study for application of the method for hydrated ethanol.

Marzullo, Rita de Cassia Monteiro 05 November 2014 (has links)
O presente trabalho apresenta uma proposta metodológica para se determinar a pegada hídrica ecotoxicológica (PHE) de produtos em uma perspectiva de ACV, dentro de uma abordagem crítica sobre o método. Cenários são construídos na forma de um estudo piloto de aplicação da metodologia para o etanol hidratado produzido por uma determinada Usina no Brasil e utilizado como combustível em carros a álcool ou carros flex. O trabalho também sugere que a PHE ou WEF (water ecotoxicity footprint ), na forma de um indicador, sirva de parâmetro tanto para o setor produtivo quanto para o mercado consumidor dentro do processo de tomada de decisão . O setor produtivo poderá utilizar o citado indicador dentro de um programa de metas de redução do nível de ecotoxicidade aquática de seu produto enquanto que, para o consumidor final, o conhecimento da PHE na forma de selo informativo servirá de alavanca rumo à evolução sustentável de nossa civilização que usará o seu poder de escolha na hora de adquirir determinado produto. Dentro da perspectiva de ACV, foram estudadas e inseridas formas de avaliação de impacto, no ponto médio, a nível local e regional com o uso de ferramentas de georeferenciamento. Na intenção de facilitar o uso da ACV no Brasil, o estudo estabelece parâmetros que tornam viável a obtenção de um indicador passível de comparação. Políticas Públicas poderão ser formadas com a possibilidade de incentivar a identificação e mitigação da ecotoxicidade aquática ao longo da cadeia de suprimentos do setor produtivo.. / This work presents a methodology to determine water ecotoxicity footprint of products in a perspective of LCA within a critical approach to the method. Scenarios are constructed in the form of a pilot study of application of the methodology for hydrous ethanol produced by a given plant in Brazil and used as fuel in flex cars. The work also suggests that the water ecotoxicity footprint, as an indicator, can be used as a parameter for both: the productive sector as well as for theend consumer within the decision-making process. The productive sector can use the cited indicator in a program targeting for reduction in aquatic ecotoxicity of your product while for the end consumer, knowledge of water ecotoxicity footprint in the form of a informative stamp will leverage towards sustainable development of our civilization that uses the power of choice when purchasing a product. From the perspective of LCA, were studied and included forms of impact assessment, at the midpoint, in local and regional level with the use of geo-referencing tools. With the intention of facilitating the use of LCA in Brazil, this study establishes criteria that make possible the comparison . Public policies can be formed with the possibility of encouraging the identification and mitigation of aquatic ecotoxicity along the supply chain of the productive sector..

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