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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.

Aplicação da metodologia \'Design for Six Sigma\' (DFSS) em projetos automotivos. / Application of the \'Design for Six Sigma\' (DFSS) methodology in automotive projects.

Alexandre Fioravanti 17 June 2005 (has links)
Este presente trabalho visa avaliar a aplicação da metodologia Design for Six Sigma (DFSS) ao processo de desenvolvimento de veículos (PDV) visando atingir níveis de qualidade Seis Sigma quando do início do processo de fabricação. Na verdade, quando se fala em fabricar produtos que já nasçam com níveis de qualidade Seis Sigma, não significa que seja mandatório que se obtenha a honrosa relação de 3,4 defeitos por milhão de oportunidades, mas sim que proporcionem resultados positivos em relação à melhoria da qualidade, otimização de custos, redução do tempo de desenvolvimento, vislumbrando o mais importante de todos os aspectos: o total entusiasmo do cliente. Para tanto, quando se fala da aplicação do DFSS no âmbito do desenvolvimento de veículos, o panorama deste contexto torna-se relativamente mais amplo e complexo, face ao nível de desenvolvimento tecnológico deste setor. O assunto é introduzido descrevendo-se o processo de desenvolvimento de veículos em sua abordagem atualmente difundida, alicerçada por um processo bem definido e estruturado, para se poder introduzir o DFSS neste processo. Antes, porém, introduz-se toda a metodologia referente ao Seis Sigma, por ser o fundamento base para a criação do DFSS. Por fim, a colocação de um estudo de caso procura relatar a aplicação da metodologia DFSS aplicada especificamente para a GM, procurando relatar a estratégia da aplicação, bem como seus principais ganhos alcançados. / This present work aims to evaluate the application of the Design for Six Sigma (DFSS) methodology to the vehicle development process (VDP) seeking to reach Six Sigma quality levels when the beginning of the production process. Actually, when it is spoken in manufacturing products that are already born with Six Sigma quality levels, it doesn\'t mean that it is mandatory that must be obtained the honorable relationship of 3,4 defects per millions of opportunities, but that provide positive results in relation to the quality improvement, costs optimization, reduction of the development timing, glimpsing the most important of all of the aspects: the customer\'s total enthusiasm. For that, when it is spoken about the application of DFSS in the extent of the vehicles development, the scenery of this context becomes relatively wider and complex, face at the level of technological development of this section. The subject is introduced being described the vehicles development process in its approach currently spread, found by a very defined and structured process, to allow introducing DFSS in this process. Before, however, the whole methodology regarding Six Sigma is introduced, for being the foundation base for the creation of DFSS. Finally, the placement of a case study tries to demonstrate the application of the DFSS methodology applied specifically for GM, trying to report the strategy of the application, as well as their main reached benefits.

A Study of Process Excellence and Quality Performance

Hung, Ming-hung 28 May 2007 (has links)
In the ongoing pursuit of excellence in products and services, many enterprises have been seeking ways to ensure their superiority in process and quality. To improve competitiveness, many management techniques and concepts have been tried, for example; TQM, Lean Thinking (Lean Production), Six Sigma, and Design for Six Sigma, etc. These are quality management systems currently having widespread application in virtually all well-known companies. This empirical study utilizes a questionnaire to explore the relationship between Process Excellence (PE) with that of quality performance (QP). In a correlation analysis we have found a positive correlation between QP and such categories as ¡§leadership and information analysis¡¨ ¡§resource utilization and participation¡¨ ¡§improvement of quality process¡¨ ¡§clear objectives and customer oriented¡¨. We have also found that two of these categories ¡§improvement of quality process¡¨ and ¡§leadership and information analysis¡¨ play especially important roles in raising QP performance. We can conclude that the greater the emphasis on these two items the better will be the performance of QP. We are also assured that the company can experience continuous quality improvement by acting on the basis of the above research findings.

Förebyggande förbättringsarbete med Design for Six Sigma

Ericsson, Evelina January 2009 (has links)
Design for Six Sigma (DFSS) is a further development of the Six Sigma draft to carry through preventing quality measures in developing and designing of new products and processes. With increasing demands on enterprises development processes to be more safety and faster the need of DFSS arise as a product, process and service development concept in the organisations. Design for Six Sigma aims to improve and structure the development process of an organisation and consider the application of the innovation problem solving. The concept aims to leave the structure of the traditional Six Sigma concept and instead, from an innovative perspective, search for new solutions to existing problems. The concept constitute of a toolbox with a lot of quality tools that are divided into phases in a development model. Combined with the organizations project model the Design for Six Sigma concept can give rise to excellent results in the work with developing and designing of new products and processes. The condition to succeed is that the draft has been established and accepted with the organizations collaborator. This thesis work summarizes the contents of the Design for Six Sigma concept. The concentration of the performance has been the underlying theory behind the DFSS draft together with the contents of the methodology and the included tools. / Design for Six Sigma (DFSS) är en vidareutveckling av Sex Sigma-konceptet för att genomföra förebyggande kvalitetsåtgärder vid ny- och vidareutveckling av produkter och processer. Med ökade krav på säkrare och snabbare utvecklingsprocesser hos organisationer uppkommer ett behov av detta produkt-, process- och tjänsteutvecklingskoncept. Design for Six Sigma konceptet behandlar strukturering och utveckling av en verksamhets utvecklingsprocess och handlar mycket om applicerandet av det som vanligen benämns innovativ problemlösning. Konceptet syftar således till att frångå Sex Sigmas traditionella strukturerade arbetssätt och istället, utifrån ett innovativt angreppssätt, söka fastställa helt nya lösningar på ett problem. Konceptet består av en verktygslåda med kvalitetsverktyg uppdelade i faser i en utvecklingsmodell. Kombinerat med en organisations projektledningsmodell kan Design for Six Sigma medföra goda resultat vid produkt och processutvecklingsarbete under förutsättning att förståelse och acceptans hos medarbetarna etablerats. Detta examensarbete sammanfattar innehållet i Design for Six Sigma-konceptet. Fokus har legat på DFSSs bakomvarande teorier vilka utgör grunderna till konceptet samt dess innehåll och verktygslåda.

Customer and product validation for physical product development in a startup context : A study on Lean Startup methods and Design For Six Sigma tools

Lindkvist, Christoffer, Niclas, Stjernberg January 2016 (has links)
No description available.

Systematic optimisation of an existing fuel oil preheating system : Facilitating replacement of 5000 cSt oil with 74 500 cSt

Fransson, Albin, van der Brug, Peter January 2020 (has links)
In order to increase the efficiency of a preheating system as temperatures increase, without using seawater as a coolant, an additional heat exchanger is required to be installed into the system. The purpose of the study is therefore to investigate how the temperatures of fuel oils can be increased while minimising the loss of energy and costs. The study was conducted in Karlshamn Power Station's (kvt) preheating system on Block 3. The study was conducted via Design for six sigma (DFSS) according to the primary design concept SG2 to guarantee the study's understanding of empirical data, and the development of solutions. The study resulted in two variants of heat exchangers where one is an identical Shell and Tube heat exchanger from Siljan Allards AB and the other one is a Supermax Shell and Plate heat exchanger from Tranter International.

Creating Total Value Engineering Through Combining Design for Manufacturing and Design for Six Sigma Constructs

Christensen, David Ryan 08 July 2014 (has links)
The modern manufacturing world has been driven to compete in a more international and interconnected system. This has led to increased focus upon frameworks and architectures to guarantee quality, high market acceptance, and reduce cost. Modern manufacturing design processes evolved largely from Henry Ford at Ford Motor Company, and Alfred Sloan at General Motors. Their structures embody two different focuses on quality and value engineering which have influenced many recent design frameworks. In the 1970s a heavy emphasis was placed upon Design for Manufacturing, which uses group technology, commonality of processes, and continual focus to reduce part count. Some companies have desired a design process that better accounts for new market needs and Voice of the Customer changes, allowing them to break out of the old processes by using a new framework called Design for Six Sigma. Contextual and survey analysis contrasting DFSS and DFM showed these systems have different definitions of what creates value; which causes a different focus on how to improve value. As the market frequently errs at knowing when to apply DFM or DFSS, using a simple case study of a product with high part and assembly cost, teams were challenged to create a better flashlight using both DFM for part reduction, and DFSS for function improvement. The aim was to increase value. Value has been defined by the formula: value = (performance + capability) / cost or as value = function/cost. Results from the case study combining DFM and DFSS constructs demonstrate a total value engineering construct. It was also shown that DFM indicated effectiveness for a slow-changing market with cost reduction focus, and DFSS demonstrated effectiveness for analyzing continually changing market needs. Disruptive innovations can replace a formerly lull market, for which DFM can be completely unprepared; while DFSS is not effective in slow product-change markets. Incorporating the best of DFSS and DFM creates a Total Value Engineering framework.

Application of ion beams for fabricating and manipulating III-Mn-V dilute ferromagnetic semiconductors

Xu, Chi 16 May 2022 (has links)
Manganese (Mn) doped III-V dilute ferromagnetic semiconductors (DFSs) are a candidate materials for semiconductor spintronics due to their intrinsic ferromagnetism mediated by holes. In this thesis, Mn doped III-V dilute ferromagnetic semiconductors (DFSs), including (Ga,Mn)As, (In,Mn)As, (Ga,Mn)P, and (In,Ga,Mn)As have been successfully prepared by ion implantation and pulsed laser melting. All (In,Ga,Mn)As films are confirmed to be well recrystallized and ferromagnetic while their Curie temperatures depend on the Ga concentration. (Ga,Mn)As and (Ga,Mn)P have an inplane easy axis, while an out-of-plane easy axis for (In,Mn)As is observed. However, all of them do not present strong in-plane uniaxial anisotropy between [110] and [110] directions, which always occurs in low temperature molecular beam epitaxy (LT-MBE) grown (Ga,Mn)As samples. The reason is ascribed to the fact that the ultra-fastrecrystallization induced by pulsed laser melting weakens the formation of Mn-Mn dimers along the [100] direction which occurs in LT-MBE grown (Ga,Mn)As. Then selected samples were co-doped with Zn or irradiated with He ions. The Zn co-doping leads to the increase of conductivity of (Ga,Mn)P, however both the Curie temperature and magnetization decrease, which is probably due to the suppression of active Mn substitution by Zn co-doping. By using Rutherford Backscattering Spectroscopy and Particle-Induced X-ray Emission, the substitutional Mn atoms in (Ga,Mn)As are observed to shift to interstitial sites, while more Zn atoms occupy Ga sites. This is consistent with first-principles calculations, showing that the formation energy of substitutional Zn and interstitial Mn is 0.7 eV lower than that of interstitial Zn and substitutional Mn. For ion irradiated (Ga,Mn)As, (In,Mn)As and (Ga,Mn)P, both Curie temperature and magnetization decrease due to the hole compensation. However, the compensation effect is the strongest in (In,Mn)As and the least in (Ga,Mn)P. This is due to the different energy level of the produced defect relative to the band edges in different semiconductors. The results in the thesis point to an important issue: the difference in the band alignment and the hole binding energy of Mn dopants in different III-Mn-V dilute ferromagnetic semiconductors have strong influence on their magnetic properties and should be taken into account in the material design.

Six Sigma within Construction Context : As a Quality Initiative, Performance Indicator/Improver, Management strategy

Muharrem Firat, Yilmaz January 2012 (has links)
Six Sigma was developed in 1980s in manufacturing industry and became popular as a process improvement method. However, the adoption of this concept is new in construction industry and the aim of this study is to evaluate Six Sigma as a process improvement method within construction context. This thesis includes Literature Review and three interviews. Literature Review had discussed process improvement methods used in construction industry and analyzed the basic features and principles of Six Sigma. Three interviews were conducted about the basic principles of Six Sigma and Quality Concept. Interviewers are a Project Manager, Field and Cost Engineer. The approach of the interview to Six Sigma is based on quality, performance and management aspects. This study defends that there is no doubt about the positive effects of Six Sigma on construction projects. Particularly, Six Sigma can provide a broader quality concept, detailed performance measurement, coordinated and repeatable process/performance improvement. It has increased quality directly/indirectly and has positive effects on production efficiency. As a 2 management approach, Six Sigma is discussable within construction context due to differences of manufacturing and construction industry. Since construction industry includes lots of unrepeatable tasks and different process design techniques, Six Sigma does not seem applicable as a whole management approach in construction industry. Furthermore, it can be integrated to the existing management procedures of companies. Taking everything into consideration, it is obvious that Six Sigma has a lot in order to accelerate fundamental and cultural challenges construction industry needs.

A Curricula Assessment And Improvement Quantitative Model For Higher Education: A Design For Six Sigma Methodology

Halawany, Abdullah 01 January 2014 (has links)
Curricula assessment is an integrated process to assist higher education institutions in addressing the challenges in a designated field of study and in exploring the opportunities to better educate and prepare their students for an increasingly complex world. Although assessment as a topic has been researched extensively, there has been a lack of quantitative tools that address the requirements of many of the stakeholders that may be critical to the curriculum design and assessment processes. This research proposes the utilization of Design for Six Sigma (DFSS) to develop a quantitative model for curriculum assessment and improvement for higher education institutions. A review of the literature indicates that there is a lack of quantitative tools that enhance the reliability and efficiency of gathering customer requirements for curriculum in higher education environment. In addition, there is a lack of tools to translate these requirements into actual characteristics that can be used for curriculum design and assessment purposes. The literature also indicates that curriculum assessment is one of several educational processes that affect the quality of education. This research proposes a quantitative model for curriculum assessment and improvement in higher education institutions, utilizing design for six sigma methodology. The proposed model explores the use of the Kano model concept to translate needed requirements into desirable curriculum attributes and the general concept of establishing transfer function to determine the level at which those requirements have been satisfied. The use of the developed model can help improve student learning and provide curriculum stakeholders with timely feedback about the curriculum and identify areas in need of improvement. To validate the capability of the proposed model, an ABET accredited department of Industrial Engineering in a US university was used a case study.

Design For Six Sigma / Design For Six Sigma

Greplová, Kristýna January 2012 (has links)
The aim of the master’s thesis is analysis of practical application limits of waste-gate TwinScroll turbocharger located in BMW X6 M vehicle by using DFSS (Design For Six Sigma) tools. The goal is to create a special measurement device for a measurement of waste gate leakage with chance of testing all sorts of characteristics having impact on key parameters of turbocharger.

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