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Balakrishnan, AnandKumar. "Concurrent engineering : models and metrics." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0004/MQ43995.pdf.
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Baker, Tyson J. "Attribution Standardization for Integrated Concurrent Engineering." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd873.pdf.
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Wiendl, Wulf. "Produktintegritätskonzept zum Einsatz in Concurrent-Engineering." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960675175.
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Fleming, Alistair. "Tailoring concurrent engineering to small companies." Thesis, Middlesex University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.568481.
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Poolton, Jenny. "Concurrent engineering establishment : a framework proposal." Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.481727.
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Douglas, Robert E. Jr. "SNEAKERS: A Concurrent Engineering Demonstration System." Digital WPI, 1999. https://digitalcommons.wpi.edu/etd-theses/1080.
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"Concurrent Engineering (CE) has already initiated a cultural change in the design and manufacturing of new products. It is expected to lead to better engineered and faster built products. But, in order for a company to take advantage of the power of CE, the members of product development teams have to be educated in the CE method of product development and how decisions made about one aspect of a design can affect other aspects. They also have to be educated in the usefulness of the tools that can be used for CE. Those tools include intelligent agents which can be used to offer design suggestions and criticisms. The goal of this project is to build a computer system which will simulate a design environment and demonstrate the essential aspects of CE, in a way that they can be intuitively understood. It is supported by a grant from the Competitive Product Development Institute at the Digital Equipment Corporation."
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Bowron, John. "Re-engineering the project procurement process through concurrent engineering." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/6811.
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The construction industry in the United Kingdom is a multi-billion pound business that contributes, on average 10% of the UK Gross Domestic Product (GDP). However, it is seen by many to be underachieving in terms of service delivery and investment opportunities. Projects are frequently late and over budget much to the disappointment of those involved in the industry and especially clients. Many investigations have been commissioned and resulting reports have suggested improvements in the way the industry is organised. Procurement of construction projects in the main are undertaken using methods that support fragmentation and adversarial relationships. However, with the introduction of partnering and prime contracting some improvements have been made. Procurement of a construction project begins with the strategies developed during briefing and is only complete when the facility is handed over to the client, some contract strategies allow for the facility to be completed once it is in operation, has been maintained and eventually is demolished. Costings and programmes are then related to life-cycle issues and aspects such as maintenance have to be taken into account during the facility development stages. The adoption of Concurrent Engineering (CE) is seen to offer the construction industry a way forward. Having been adopted extensively by manufacturing in its product development stages a similar adoption by the construction industry would go some way to achieving the 30% improvement in real terms suggested by Latham [1994] and Egan [1998]. The research described in the thesis aims to develop a new procurement method for the delivery of construction projects. The approach adopted was to identify current methods of procurement and the problems associated with each method. Then using Concurrent Engineering as a basis, a new procurement model was developed that offered potential improvements in the construction process between the stages of Clients Briefing and Detailed Design. The resulting model was evaluated through the application of CE principles into the process and by the presentation and discussion of the method with a number of industry participants, followed by the completion and assessment of a questionnaire. The model was shown to fulfil the principles of CE and could be adopted into construction. It offers a new approach to procurement which in turn would save costs and time and potentially improve the quality of the final construction product.
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Regan, Cynthia Lee. "A concurrent engineering framework for apparel manufacture." Diss., This resource online, 1997. http://scholar.lib.vt.edu/theses/available/etd-07132007-143155/.
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Sampson, Adam T. "Process-Oriented Patterns for Concurrent Software Engineering." Thesis, University of Kent, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527586.
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Laguda, Alima. "Aggregate assembly process planning for concurrent engineering." Thesis, Durham University, 2002. http://etheses.dur.ac.uk/4144/.
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In today's consumer and economic climate, manufacturers are finding it increasingly difficult to produce finished products with increased functionality whilst fulfilling the aesthetic requirements of the consumer. To remain competitive, manufacturers must always look for ways to meet the faster, better, and cheaper mantra of today's economy. The ability for any industry to mirror the ideal world, where the design, manufacturing, and assembly process of a product would be perfected before it is put mto production, will undoubtedly save a great deal of time and money. This thesis introduces the concept of aggregate assembly process planning for the conceptual stages of design, with the aim of providing the methodology behind such an environment. The methodology is based on an aggregate product model and a connectivity model. Together, they encompass all the requirements needed to fully describe a product in terms of its assembly processes, providing a suitable means for generating assembly sequences. Two general-purpose heuristics methods namely, simulated annealing and genetic algorithms are used for the optimisation of assembly sequences generated, and the loading of the optimal assembly sequences on to workstations, generating an optimal assembly process plan for any given product. The main novelty of this work is in the mapping of the optimisation methods to the issue of assembly sequence generation and line balancing. This includes the formulation of the objective functions for optimismg assembly sequences and resource loading. Also novel to this work is the derivation of standard part assembly methodologies, used to establish and estimate functional tunes for standard assembly operations. The method is demonstrated using CAPABLEAssembly; a suite of interlinked modules that generates a pool of optimised assembly process plans using the concepts above. A total of nine industrial products have been modelled, four of which are the conceptual product models. The process plans generated to date have been tested on industrial assembly lines and in some cases yield an increase in the production rate.
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McCord, Kent R. (Kent Richard). "Managing the integration problem in concurrent engineering." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/37504.
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Hanneghan, Martin. "An architecture to support virtual Concurrent Engineering." Thesis, Liverpool John Moores University, 1998. http://researchonline.ljmu.ac.uk/4902/.
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Sio, Sei Hoi. "Concurrent engineering in modern mold design and production." Thesis, University of Macau, 2001. http://umaclib3.umac.mo/record=b1446138.
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Altenhof, Jeffrey L. "Computer-aided concurrent engineering in refrigeration system design." Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-01262010-020010/.
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Bhuiyan, Farina. "Dynamic models of concurrent engineering processes and performance." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38153.
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Mathematical and stochastic computer models were built to simulate concurrent engineering processes (CE) in order to study how different process mechanisms contribute to new product development (NPD) performance. Micro-models of various phenomena which occur in concurrent engineering processes, such as functional participation, overlapping, decision-making, rework, and learning, were included, and their effects on the overall NPD process were related to process span time and effort. The study focused on determining under what conditions CE processes are more favorable than sequential processes, in terms of expected payoff, span time, and effort, as dependent variables of functional participation and overlapping, and the corresponding trade-offs between more upfront effort versus span time reduction.
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Evbuomwan, Nosayaba Francis Osa. "Design function deployment : a concurrent engineering design system." Thesis, City University London, 1994. http://openaccess.city.ac.uk/7540/.
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The current state of activities in the design and manufacturing industry is marked by the various CAD/CAM/CAE systems which exist as islands of automation, and are used by engineers and designers in a non-integrated and ill-structured way. Thus the design problem is examined from separate and different perspectives, rather than as a whole. The goal of this research, is to develop a comprehensive, integrated and generic design system, that will ensure the realisation of concurrent engineering in practice. To this end, Design Function Deployment (DFD) has been developed. DFD enables the capture of customers' requirements, the establishment of design specifications and constraints in a solution neutral form, the generation of conceptual designs (architectures), the development of detailed designs layouts), the selection of materials and associated manufacturing processes and the development of suitable production plans. The generated design solutions are optimised against a composite set of multi-criteria (attributes) in a concurrent manner for key factors such as performance, robustness and cost as well as other life cycle issues (manufacture, assembly, serviceability, reliability, environment, etc) in order to choose the most satisfying design. DFD provides a recipe of design methods to support the designer or design team at any stage of the design process. The optimisation process involves the use of these supporting design tools (methods) encapsulated within it. DFD also provides an integrated product modelling environment which integrates both textual and geometric design information, and enables the capture of other design information related to design intent, rationale and history. The research that led to the evolution and development of DFD involved (a) a detailed investigation and research on Quality Function Deployment, QFD, a technique well suited for capturing and translating customer requirements into design specifications, (b) an extensive review of design philosophies, models, methods and systems and (c) an extensive investigation into concurrent engineering. The findings of this research has led to the development of the structure of the DFD system, which incorporates (1) a prescriptive design model, (2) a suite of design methods and (3) supporting knowledge/rulebases and databases, which are used for the generation of the design solution space and the optimal selection of the most satisfying design for subsequent implementation.
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Dick, Jochen Helmut. "Cost modelling and concurrent engineering for testable design." Thesis, Brunel University, 1993. http://bura.brunel.ac.uk/handle/2438/5284.
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As integrated circuits and printed circuit boards increase in complexity, testing becomes a major cost factor of the design and production of the complex devices. Testability has to be considered during the design of complex electronic systems, and automatic test systems have to be used in order to facilitate the test. This fact is now widely accepted in industry. Both design for testability and the usage of automatic test systems aim at reducing the cost of production testing or, sometimes, making it possible at all. Many design for testability methods and test systems are available which can be configured into a production test strategy, in order to achieve high quality of the final product. The designer has to select from the various options for creating a test strategy, by maximising the quality and minimising the total cost for the electronic system. This thesis presents a methodology for test strategy generation which is based on consideration of the economics during the life cycle of the electronic system. This methodology is a concurrent engineering approach which takes into account all effects of a test strategy on the electronic system during its life cycle by evaluating its related cost. This objective methodology is used in an original test strategy planning advisory system, which allows for test strategy planning for VLSI circuits as well as for digital electronic systems. The cost models which are used for evaluating the economics of test strategies are described in detail and the test strategy planning system is presented. A methodology for making decisions which are based on estimated costing data is presented. Results of using the cost models and the test strategy planning system for evaluating the economics of test strategies for selected industrial designs are presented.
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Ogawa, Akira S. M. Massachusetts Institute of Technology. "Concurrent engineering for mission design in different cultures." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43175.
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Thesis (S.M.)--Massachusetts Institute of Technology, System Design and Management Program, 2008.Includes bibliographical references (p. 95-96).
The satellite is a highly complex system due to the tight physical constraints, high reliability requirements, and the scale of the product. Except for some commercial missions, most of the satellites are designed from concept to optimally achieve their missions. Historically, the multidisciplinary team spent several months or even a year to finish the concept design. As the information technology revolution occurred in 1990's, Integrated Concurrent Engineering (ICE) was invented to reduce cycle time and reduce resources but with higher quality. It is a new method of real-time team collaboration based on the quantitative computer-based calculations. It was introduced with significant success by JPL/NASA and The Aerospace Corporation. Some organizations followed in using ICE and also confirmed that the design period was reduced from months to weeks. Despite the remarkable successes of the ICE application in the United States and Europe, it is neither used nor well known in other parts of the world. The Japanese organizations, for instance, provide complex products and show their presence world wide, but there is no report of an organization utilizing the ICE approach. They applied the concurrent engineering in manufacturing long ago. It is unclear what brought this situation. The ICE approach has been well examined from the systems engineering perspective but not from the cultural aspect. This thesis analyzes the ICE approach to identify the key factors for successful implementation and operation from both systems engineering and cultural perspectives through the case studies of a implementation failure in a Japanese organization and some successes in Euro-American organizations. Then, the author proposes several ways for successful implementation in the Japanese organization and proposes how the ICE should be approached and be utilized to leverage the design capability of the organization.
by Akira Ogawa.
S.M.
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Häkkinen, Markus. "Viktiga faktorer produktutveckling enligt set based concurrent engineering." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-12104.
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Oftast har produktutveckling samma generella tillvägagångssätt: En specifikation för en ny produkt lämnas från en marknadsföringsavdelning till en produktutvecklingsavdelning. Produktutvecklare tar sedan fram koncept som utvecklas till prototyper för att sedan tillverkas och säljas. Tillvägagångssättet skiljer sig vanligtvis genom att olika modeller som exempelvis Lean product development eller integrerad produktutveckling används i processen. Delen av Lean product development (LPD) som används vid konceptutveckling kallas set based concurrent engineering (SBCE) och dessa begrepp är relativt nya i Sverige. Vad krävs för att arbeta med set based concurrent engineering på ett framgångsrikt sätt? Går det att identifiera viktiga faktorer vid produktutveckling med SBCE hos företag? En litteraturstudie som resulterade i en lista med fem potentiellt viktiga faktorer vid produktutveckling med SBCE gjordes inför en kvalitativ studie av fem företag. Semistrukturerade intervjuer utfördes på Husqvarna, Saab, Furhoffs, Ericsson Radio och GKN Aerospace för att samla in empiri inför analys. I analysen jämfördes företagens sätt att produktutveckla med listan som togs fram i litteraturstudien. Slutsats av studien var att några viktiga faktorer för att lyckas med produktutveckling enligt SBCE är: Bred lösningsrymd, Kunskapsbaserat bortval av koncept, Återvinning av kunskap, Tekniskt kunnig projektledning, Tvärfunktionella arbetsgrupper. Dessutom framkom att en investering i rätt ledarskap kan vara en viktig faktor vid implementering av SBCE då företagets ledning måste ha förståelse för arbetsmodellen om SBCE ska kunna resultera i en positiv effekt.Product development usually has the same general approach: A specification for a new product is provided to the product development department from the marketing department. Product developers then generate concepts which are developed into prototypes before the products are manufactured and sold. The procedure usually differs by the use of different models such as Lean product development or integrated product development in the process. The part of Lean product development (LPD) that is used when developing concepts is called set based concurrent engineering (SBCE) and these are new concepts in Sweden. What is required to work with set based concurrent engineering in a successful manner? Is it possible to identify important factors when developing products using SBCE in companies? A literature study which resulted in a list with five potentially important factors when developing products using SBCE was created before a qualitative study was conducted at five companies. Semi structured interviews were conducted at Husqvarna, Saab, Furhoffs, Ericsson Radio and GKN Aerospace to gather data for an analysis. In the analysis, comparisons were made between the companies’ way of developing products with the list that was created in the end of the literature study. A conclusion of the study was a number of important factors when developing products using SBCE could be: Wide solution space, Knowledge based screening of concepts, Recycling of knowledge, Technically competent project management, Cross functional teams. The study also showed that an investment in the right type of leadership could potentially be an important factor when implementing SBCE since the company management need to understand the working model if SBCE is going to have a positive effect.
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Zhuang, Ruiqiang. "Conflict detection in Web based concurrent engineering design." [Florida] : State University System of Florida, 1999. http://etd.fcla.edu/etd/uf/1999/amp7641/zhuang.pdf.
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Thesis (M.S.)--University of Florida, 1999.Title from first page of PDF file. Document formatted into pages; contains vi, 55 p.; also contains graphics. Vita. Includes bibliographical references (p. 52-54).
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Blechinger, Juliane [Verfasser]. "Ein Metadatenrepositorium zum Datenqualitätsmonitoring im Concurrent Engineering / Juliane Blechinger." Aachen : Shaker, 2012. http://d-nb.info/1067736484/34.
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Huang, Enzhen. "A simulation research framework for concurrent engineering project management." Thesis, Montana State University, 2005. http://etd.lib.montana.edu/etd/gsetd/2005/huang/HuangE0505.pdf.
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In concurrent engineering, project tasks usually are interdependent among each other. Iterations, which are required for the interdependent tasks, make traditional PERT/CPM not applicable for the estimation of the project completion time. In addition, carrying out a large scaled project in a dynamic environment has to deal with various factors throughout the entire project life cycle. When estimating the project completion time, previous research often focused on one subject of interests and assumed the other factors causing little effects on the overall project duration. The objective of this thesis is to develop a simulation research framework to help estimate the project completion time and analyze the major factors that affect the estimation for complex concurrent engineering projects. The framework consists of three major components: 1) Data Collection, where the needed data for simulation are prepared including project task structure, task relations, and quantified team member characteristics; 2) Simulation, where tasks are dynamically assigned to the appropriate members/engineers according to each member\'s knowledge level to the task, teamwork capability, work schedule availability, and learning curve improvement; and 3) Data Analysis, where significant factors to the project completion time are studied by the ANOVA analysis based on the simulation results. According to the findings from the ANOVA, heuristic rules are developed to improve the performance of task-member assignments. The effectiveness of the research framework, the simulation model and the heuristics is demonstrated by an illustrative example.
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Karlsson, Mårten. "Green concurrent engineering : a model for DFE management programs /." Lund : International Institute for Industrial Environmental Economics (Internationella miljöinstitutet), Univ, 2001.
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Liu, Yun 1969. "A study of key mechanisms for concurrent engineering processes /." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83872.
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Previous studies (Bhuiyan, 2001; Bhuiyan et al., 2003; Jaafar, 2001) used stochastic computer models to study concurrent engineering (CE) processes. This thesis used the same models, but modified the two main mechanisms used in CE, that is, functional interaction and overlap, in order to better understand how they contribute to process performance, i.e., how they affect product development effort and span time. The present study used more realistic development processes over previous research in addition to using the same uncertainty conditions, rework, learning, and communication techniques. Simulation results of the updated models were discussed in comparison to the baseline models in terms of effort versus span time and effort distribution during the process versus span time.Research outcomes indicated that the use of CE was beneficial as long as the uncertainty of information during product development was moderate to low. When uncertainty was high, sequential engineering was best. Several cases were demonstrated.
The distribution of effort during product development was studied and it showed that processes should be designed to avert rework due to design versions (complete redesign of the product) and should emphasize churn (redesign in small steps during teamwork).
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Abdalla, Hassan Shafik. "Development of a design for manufacture concurrent engineering system." Thesis, De Montfort University, 1995. http://hdl.handle.net/2086/4253.
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Lettice, Fiona E. "Concurrent engineering : a team-based approach to rapid implementation." Thesis, Cranfield University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283251.
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Bradley, Hugh D. "Aggregate process planning and manufacturing assessment for concurrent engineering." Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4719/.
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The introduction of concurrent engineering has led to a need to perform product development tasks with reduced information detail. Decisions taken during the early design stages will have the greatest influence on the cost of manufacture. The manufacturing requirements for alternative design options should therefore be considered at this time. Existing tools for product manufacture assessment are either too detailed, requiring the results of detailed design information, or too abstract, unable to consider small changes in design configuration. There is a need for an intermediate level of assessment which will make use of additional design detail where available, whilst allowing assessment of early designs. This thesis develops the concept of aggregate process planning as a methodology for supporting concurrent engineering. A methodology for performing aggregate process planning of early product designs is presented. Process and resources alternatives are identified for each feature of the component and production plans are generated from these options. Alternative production plans are assessed in terms of cost, quality and production time. A computer based system (CESS, Concurrent Engineering Support System) has been developed to implement the proposed methodology. The system employs object oriented modelling techniques to represent designs, manufacturing resources and process planning knowledge. A product model suitable for the representation of component designs at varying levels of detail is presented. An aggregate process planning functionality has been developed to allow the generation of sets of alternative plans for a component in a given factory. Manufacturing cost is calculated from the cost of processing, set-ups, transport, material and quality. Processing times are calculated using process specific methods which are based on standard cutting data. Process quality cost is estimated from a statistical analysis of historical SPC data stored for similar operations performed in the factory, where available. The aggregate process planning functionality has been tested with example component designs drawn from industry.
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Tan, Yong Chai. "Multi expert concurrent engineering system to assist a designer." Thesis, University of Portsmouth, 2007. https://researchportal.port.ac.uk/portal/en/theses/multi-expert-concurrent-engineering-system-to-assist-a-designer(85cad085-5cc1-4f6d-8859-21b074704aa7).html.
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This dissertation describes a new Concurrent Engineering system with distributed intelligence to demonstrate the use of a Virtual Round Table to assist a designer in the early design stages of a spot welding application. This Computer Aided Process Planning system is called a Multi Expert System. The first system consisted of four expert systems: Computer Aided Design Expert, Material Expert, Spot Welding Expert and Production Expert. A limitation of existing systems was that they were designed to model the product and process design as a whole, which made the system inflexible for expansion when new processes needed to be included. The new system described in this dissertation overcame this problem by modelling product and process design using a natural approach for capturing intelligence from different processes. The new approach categorised the product and process design processes into separate individual experts. Intelligence and knowledge from each process was captured and embedded within the individual expert that represented the process. A virtual round table for design was created. This approach enabled greater flexibility in terms of modifiability, upgradeability, extendibility and reusability. To demonstrate this new approach, a new CAD Expert was created. The expert was used to interpret drawing files from CAD software. A new simple and efficient method to detect overlaps that used an entities comparison technique is presented. The material selection process was modelled with a Material Expert. A new property weighting method was formulated and successfully tested to improve the materials selected. A Spot Welding Expert was created to help designers in spot welding tasks. A new method for spot welding knowledge acquisition and representation is presented. The new method used a novel "Expandable Knowledge Base" that allowed knowledge to be expanded over time and experience. In addition, this technique enabled a suggestion or an estimated answer to be calculated from existing knowledge even if the specific knowledge required was not available. Spot welding locations were then determined. The manufacturing process was integrated with the new system as a Production Expert. Fanuc S-700 robot programs were automatically generated for spot welding tasks. The time and cost needed to perform a task was calculated and the programs were used to drive a Fanuc S-700 robot. Finally, to prove the flexibility of the system, a new virtual round table for a spray painting application was created. This work was an extension of research by Sanders(1994) and Tewkesbury (1994) on design using distributed intelligence within Advanced Production Machinery and Rasol (2000) on automatic systems for simple spot welding tasks.
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Victor, Sundar K. "Negotiation Between Distributed Agents in a Concurrent Engineering System." Digital WPI, 1999. https://digitalcommons.wpi.edu/etd-theses/1083.
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"Current approaches to design are often serial and iterative in nature, leading to poor quality of design and reduced productivity. Complex artifacts are designed by groups of experts, each with his/her own area of expertise. Hence design can be modeled as a cooperative multi-agent problem-solving task, where different agents possess different expertise and evaluation criteria. New techniques for Concurrent Design, which emphasize parallel interaction among design experts involved, are needed. During this concurrent design process, disagreements may arise among the expert agents as the design is being produced. The process by which these differences are resolve to arrive at a common set of design decisions is called Negotiation. The main issues associated with the negotiation process are, whether negotiation should be centralized or distributed, the language of communication and the negotiation strategy. The goals of this thesis are to study the work done by various researchers in this field, to do a comarative analysis of their work and to design and implement an approach to handle negotiation between expert agents in an existing Concurrent Engineering Design System."
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Wardell, Eric Joseph. "Concurrent Engineering through Parallelization of the Design-Analysis Process." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5281.
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The disconnect between the way CAD and analysis applications handle model geometry has long been a hindrance to engineering design. Current industry practices often utilize outdated forms of geometry transfer between these different engineering software applications such as neutral file formats and direct translations. Not only to these current practices slow the engineering design process but they also hinder the integration of design and analysis programs.This thesis proposes a new, multi-user, integrated design-analysis architecture which allows auxiliary functions such as analysis and computer-aided manufacturing to be better connected with the computer-aided design. It is hypothesized that this new architecture will reduce the time of design-analysis iterations and create more parallelization between CAD and auxiliary programs. A prototype of the proposed architecture was constructed and then tested to evaluate the hypotheses, from which it was discovered that the proposed architecture does indeed reduce the time of iterations in the design-analysis cycle and allows for the parallelization of some design and analysis tasks.
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Kopinsky, Justin. "Relaxed concurrent ordering structures." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118089.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 131-137).
Efficient implementations of concurrent ordering structures, including stacks, queues, and priority queues, have long been elusive due to an inherent bottleneck on the 'head' element. We argue that classical semantics which are easy to support in sequential settings are stronger than necessary for concurrent applications, and instead define new semantics for implementing relaxed ordering structures: relaxed structures need only return elements which are probabilistically near the head element. This thesis demonstrates the effectiveness of relaxed semantics by formally defining a notion of k-relaxation which imposes behavior 'similar' to that of a structure which returns one of the k elements nearest the head uniformly at random. This behavior is encapsulated by two probabilistic criteria: error boundedness-a bound on the distance of a returned element from the head--and fairness--a bound on the number of operations an element has to wait before being returned by some thread. We design, analyze, and implement k-relaxed algorithms in this model, showing both that they achieve good values of k in theory and that they exhibit empirically good performance on applications such as Single-Source Shortest Paths. Finally, we introduce a general framework for using relaxed structures to schedule and execute a wide class of problems which can be formulated as a series of task executions with dependencies between tasks. Our framework provides a case study demonstrating that applications can use our model of relaxed data structures to prove that the extra work induced by reordering tasks is low in the settings that we consider. Empirically, our benchmarks show that the low overhead is more than offset by increased throughput, resulting in improved performance on tasks such as Maximal Independent Set compared to an exact scheduler.
by Justin Kopinsky.
Ph. D.
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Harding, Jennifer A. "A knowledge representation model to support concurrent engineering team working." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/7054.
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This thesis demonstrates that a knowledge representation model can provide considerable support to concurrent engineering teams, by providing a sound basis for creation of necessary software applications. This is achieved by demonstrating that use of the knowledge representation model facilitates the capture, interpretation and implementation of important aspects of the multiple, diverse types of expertise which are essential to the successful working of concurrent engineering project teams. The varieties of expertise which can be modelled as instances of the knowledge representation model range from specialist applications, which support particular aspects of design, by assisting human designers with highly focused skills and knowledge sets, to applications which specialise in management or coordination of team activities. It is shown that both these types of expertise are essential for effective working of a concurrent engineering team. Examination of the requirements of concurrent engineering team working indicate that no single artificial intelligence paradigm can provide a satisfactory basis for the whole range of possible solutions which may be provided by intelligent software applications. Hence techniques, architectures and environments to support design and development of hybrid software expertise are required, and the knowledge representation model introduced in this research is such an architecture. The versatility of the knowledge representation model is demonstrated through the design and implementation of a variety of software applications.
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Loureiro, Geilson. "A systems engineering and concurrent engineering framework for the integrated development of complex products." Thesis, Loughborough University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250969.
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Balbontin-Posadas, Alejandro. "CETGI : an assessment tool for global concurrent engineering : executive summary." Thesis, University of Warwick, 2000. http://wrap.warwick.ac.uk/4505/.
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Industrial globalisation and the increased complexity of products promote new product development (NPD) by distributed teams. These teams facilitate the transfer of designs to manufacturing facilities, the adaptation of products to local markets and the access to engineering design talents. However, there are many industrial experiences of under performing distributed teams, such as the development of the Ford Mondeo which ran a year late and cost £4 billion. This Engineering Doctorate project CETGI (Concurrent Engineering and Teamwork across Global Industries) aimed to investigate and advise companies on the enabling practices of global concurrent engineering (GCE). An assessment tool for GCE was developed, embedding its enabling practices in a knowledge base and providing structured advice to manufacturing companies of electro-mechanical products. Preliminary investigation was conducted towards the development of the CETGI tool: literature review on GCE; a benchmark study of nine current concurrent engineering assessment tools; a comparative analysis of NPD practices in the UK and the USA; a survey of NPD practices of global companies developing products in the UK; and thirteen case studies of GCE projects. The CETGI tool was then developed, consisting of an assessment process involving multifunctional teams and executives. CETGI is different to previous tools because of its knowledge base of GCE practices and its three analytical algorithms: the first, aggregates the individual answers; the second, provides a customised list of prioritised actions; and the third, generates maturity charts, providing a performance perspective and supporting benchmarking. Another novel feature of CETGI is the Internet enabled software application that supports its assessment process. The latter software is a multi-participant decision-making support system. The CETGI tool has been applied to three first tier supplier companies, two from the automotive industry and one from the transport industry aimed at fine-tuning and validating the tool. The work focused on evaluating the reliability of the questionnaire (constructed on the knowledge base) and establishing the validity and the industrial usefulness of the CETGI tool. On average, the NPD executives considered 90% of the suggested actions appropriate, selected 70% of the actions for implementation and implemented 51% of the selected actions (based on a post-assessment review at one company). The actions were estimated to reduce time-to-market and product-unit costs by the NPD executives and they rated CETGI highest in terms of promoting global product development, followed by providing an overall picture of the current product development process. Further research opportunities have been identified such as using the CETGI tool to assess other business areas apart from GCE. This would require investigating best practices in these areas and embedding the results in specific knowledge bases. The assessment method, the structure of the knowledge base and the analytical algorithms would remain the same.
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Honoré, Francis. "A concurrent video compression system." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/37997.
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Shelly, Jacinda R. (Jacinda Rene). "Concurrent gate-level circuit simulation." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61576.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 42).
In the last several years, parallel computing on multicore processors has transformed from a niche discipline relegated primarily to scientific computing into a standard component of highperformance personal computers. At the same time, simulating processors prior to manufacture has become increasingly time-consuming due to the increasing number of gates on a single chip. However, writing parallel programs in a way that significantly improves performance can be a difficult task. In this thesis, I outline principles that must be considered when running good gate-level circuit simulations in parallel. I also analyze a test circuit's performance in order to quantitatively demonstrate the benefit of considering these principles in advance of running simulations.
by Jacinda R. Shelly.
M.Eng.
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Fenwick, John William 1977. "Collaborative concurrent mapping and localization." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8575.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.Includes bibliographical references.
Autonomous vehicles require the ability to build maps of an unknown environment while concurrently using these maps for navigation. Current algorithms for this concurrent mapping and localization (CML) problem have been implemented for single vehicles, but do not account for extra positional information available when multiple vehicles operate simultaneously. Multiple vehicles have the potential to map an environment more quickly and robustly than a single vehicle. This thesis presents a collaborative CML algorithm that merges sensor and navigation information from multiple autonomous vehicles. The algorithm presented is based on stochastic estimation and uses a feature-based approach to extract landmarks from the environment. The theoretical framework for the collaborative CML algorithm is presented, and a convergence theorem central to the cooperative CML problem is proved for the first time. This theorem quantifies the performance gains of collaboration, allowing for determination of the number of cooperating vehicles required to accomplish a task. A simulated implementation of the collaborative CML algorithm demonstrates substantial performance improvement over non-cooperative CML.
by John William Fenwick.
S.M.
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Sky, Ron W. E. "Modeling and implementing concurrent engineering in a virtual collaborative environment." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ39886.pdf.
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Aganovic, Dario. "On Manufacturing System Development in the Context of Concurrent Engineering." Doctoral thesis, Stockholm, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3807.
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Khalfan, Malik Mansoor Ali. "Benchmarking and readiness assessment for concurrent engineering in construction (BEACON)." Thesis, Loughborough University, 2001. https://dspace.lboro.ac.uk/2134/6925.
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In the increasingly competitive business environment reduced project cost, improved time-to-market, better quality products, and customer involvement are becoming the key success factors for any product development process. Many organisations within different industries are now focusing on Concurrent Engineering (CE) to bring improvements to their product development process in order to keep pace with the competitive environment. The adoption of CE has shown positive effects on project quality, cost, lead time, schedule, and customer satisfaction. For a targeted and effective implementation, it is recommended to carry out a readiness assessment of an organisation prior to the adoption of CE. This thesis discusses the adoption of CE within the construction industry, reviews existing CE readinessa ssessmentto ols used in other industry sectors,a nd assessesth eir applicability to construction. It then presentsa new developedC E readinessa ssessmentto ol for construction called the 'BEACON Model', its associated questionnaire, and an associated software. Description and results of CE readiness assessment case studies, which were conducted within five sectors of the construction industry, are then presented. At the end of the thesis, CE implementation strategiesa nd considerationsa re presentedb asedo n the assessmenrte sults, followed by conclusions, recommendations and future work. The most important conclusion, which could be drawn from the research, is that the construction industry as a whole still needs improvements in most of the critical areas identified by the BEACON Model in order to adopt CE effectively.
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Mohamad, Mohamad I. "The application of concurrent engineering philosophy to the construction industry." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/7026.
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The research explores the rationale of applying Concurrent Engineering (CE) philosophy to the construction industry. CE was considered based on its successful implementation in other industries. In the manufacturing industry it is used to overcome problems similar in nature to those of the construction industry, resulting from the practice of the traditional 'over the wall' processes in product design and manufacturing (construction). During the initial stage, the research evaluated current problems faced by the industry, such as the high degree of fragmentation of industry structure and work processes, adversarial elationships among project participants' lack of communication, etc., and its effort to achieve improvement. The research also investigated the theoretical background of CE philosophy, its application in other industries especially in manufacturing, the rationale for its application to construction, and current practices within the construction industry similar to those encompassed within the CE philosophy. CE consists of several basic principles, of which the teamwork was the main focus of this research and is used as the main strategy to achieve CE implementation for construction industry. By using both quantitative and qualitative evaluation, the research determined that there was no evidence to support that CE has been practised in construction as a complete process, as it has in other industries. The research also established a number of factors that support and inhibit collaborative teamwork in construction, and rank them according to their relative importance. The rankings indicate the priorities for the industry in order to achieve collaborative working, which is critical to CE implementation. The main output of the research was the establishment of 'guidelines' for implementing a Cross Functional Project Team (CFPT), i.e. the cross functional teamwork concept based on CE principles, forming the main strategy to implement CE in construction. The 'guidelines' were developed based on the consensus opinion of industry experts using the Delphi study technique. The findings from case studies were used to validate these 'guidelines'. The research also developed a tool known as the Matrix Measurement Guidelines - 'Toward CE in Construction' (MMG-TCEiC) to help the industry to map the process toward achieving a collaborative teamwork concept based on CE environments within construction projects.
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Sweitzer, Timothy J. (Timothy James) 1972. "A simulation-based concurrent engineering approach for assembly system design." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/82902.
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Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; in conjunction with the Leaders for Manufacturing Program at MIT, 2002.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 81-82).
by Timothy J. Sweitzer.
S.M.
M.B.A.
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Cerqueira, Christopher Shneider. "Tangible collaboration applied into space systems concurrent engineering concept studies." Instituto Nacional de Pesquisas Espaciais (INPE), 2018. http://urlib.net/sid.inpe.br/mtc-m21b/2018/02.21.22.30.
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A primeira fase de desenvolvimento de uma Missão Espacial consiste dos Estudos Conceituais de Sistemas Espaciais, na qual os conceitos do sistema são definidos, como um conjunto de Soluções de Sistemas viáveis para atender às necessidades da missão. Hoje em dia, esta fase envolve as práticas de Engenharia de Sistemas (System Engineering - SE) e Engenharia Simultânea (Concurrent Engineering - CE), que respectivamente: (i) organiza a metodologia de investigação e documentação de sistemas e (ii) agiliza o processo em paralelização de estudos das disciplinas e sucessões de sessões de convergência (CE Sessions). As sessões para os Estudos Conceituais de Sistemas Espaciais são atividades altamente interativas, que requerem: (i) especialistas de uma determinada disciplina (térmica, operacional, elétrica, etc.) para descreverem ao grupo de especialistas seus modelos com as Soluções dos Elemento do Sistema, mostrando suas partes e parâmetros necessários, e (ii) instalações para realizar as atividades durante as sessões, acelerando o trabalho para as soluções dos conceitos dos sistemas. Ou abordagens centradas no documento ou nas centradas no modelo, as colaborações de modelos ocorrem por: projeção dos modelos, dentro de uma ordem sequencial, e de acordo com o número do projetores, que mostram os modelos da disciplina. A virtualização da informação diminuiu a colaboração física usando artefatos, dando preferência às colaborações de metáforas apenas virtuais, deixando de lado, por exemplo, uma pessoa que reúne dois peões físicos significa que uma nova representação foi obtida, estas representações foram substituídas por arrastar e soltar de ramos de informação em interface usuário gráficas. Este trabalho propõe e demonstra a viabilidade de utilizar Interfaces Tangíveis construídas com artefatos eletrônicos físicos e Realidade Aumentada Espacial para reintroduzir interações físicas colaborativas nas sessões de Engenharia Simultânea. Foi definido um vocabulário de interação tangível para uso de artefatos reais capazes de controlar os dados dos modelos. Em um aspecto pragmático na engenharia, esta tese traz para o espaço de trabalho de design as ferramentas cognitivas.The first development phase of a Space Mission consists of the Space System Concept Studies, in which system concepts are broadly defined, as a set of feasible System Conceptual Solutions to accomplish the mission needs. Nowadays, this phase involves the practices of System Engineering (SE) and Concurrent Engineering (CE), which respectively: (i) organizes the systems investigation/documentation methodology, and (ii) speed-up the process into parallelization of disciplines studies and successions of convergence sessions (CE Sessions). The CE Sessions for Space System Concept Studies are highly interactive activities, which require: (i) specialists of a given discipline (thermal, operation, electrical, etc.) to describe to the team their System Element solution models, showing its parts and required parameters, and (ii) facilities to handle the CE activities streamlining the work toward the System Concept Solutions. Either in document-centric or model-centric approaches, the model collaborations occur by: projection of the models, within a sequential order, and accordingly to the number of the projectors, which shows the disciplines models. This virtualization of information undermined the physical collaboration through artefacts, in preference to virtual-only metaphor collaborations, where, for instance, a person bringing together two physical peons means that a new representation is obtained, was replaced by drag-n-drop tree branches in Graphical User Interface (GUI). This thesis proposes and demonstrates the viability to use Tangible User Interfaces (TUI) constructed with physical electronic artefacts and Spatial Augmented Reality to reintroduce tangible collaboration into CE Session. A tangible interaction vocabulary was defined in order to use real artefacts to control CE data. In a pragmatic aspect for the Space Engineering sector, this thesis brings cognitive aid tools back to the design workspace.
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Andersson, Rickard. "Set Based Concurrent Engineering : En undersökning för Scania CV AB." Thesis, KTH, Maskinkonstruktion (Inst.), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-100687.
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This Master thesis has been carried out at Scania CV AB in Södertälje, in collaboration with KTH, The Royal Institute of Technology, Stockholm. The focus of this Master thesis is Set Based Concurrent Engineering (SBCE), with the purpose of answering the questions: what is SBCE, how does it work, and for what purposes is it applied. It was early established that SBCE is often included as a part of Lean product development, which in its turn is often related to Toyota’s way of working. The SBCE method includes working with multiple solutions in parallel, eliminating weak alternatives throughout the whole process. In opposite to a conventional product development process, where it is common one at an early stage tries to identify and choose the most promising alternative. Despite the appearance of SBCE as a resource consuming method, figures from Toyota indicates the opposite, that SBCE is in fact a very effective way of working compared to other more traditional methods. The process of this Master thesis was divided into three phases. An extensive information gathering part was carried out with the purpose of compiling available material about SBCE. Subsequently, an overview of the present work procedures at Scania was gathered, but no signs of SBCE were found. Based on the theory and the empirical results, an extensive discussion is presented. This constitutes the base for two presentations produced: one summarizing to be presented at KTH, and one extended version to be used as education material about SBCE at Scania. These are however not presented in this report. Consequently the main purpose of this Master thesis has then been to compile and present available material about SBCE. Conclusions for this thesis are thereby mostly drawn from available literature. It was established that major differences between SBCE and traditional product development exist. It was however not possible to decide how important SBCE alone has been for the success of Toyota. It was also concluded, based on the literature, that SBCE may work both as a system for minimizing risks as well as maximizing knowledge in product development. But SBCE should however, for maximizing its potential, be accompanied and supported by a few other systems and tools.Detta examensarbete är utfört i samarbete med Scania CV AB i Södertälje och Kungliga Tekniska Högskolan, Stockholm. Examensarbetet handlar om Set Based Concurrent Engineering (SBCE), med ett övergripande syfte att besvara följande frågor: vad SBCE är för något, hur det fungerar och vad det kan användas till. Inledningsvis konstaterades att SBCE många gånger innefattas som ett delmoment inom Lean Produktutveckling, vilket i sin tur ofta kopplas samman med Toyotas arbetssätt. Arbetsmetoden för SBCE fokuserar på att undersöka och utveckla fler lösningar parallellt och eliminera svaga alternativ efter hand, till skillnad från traditionell produktutveckling som tidigt väljer det mest lovande alternativet. Trots att SBCE vid en första introduktion kan verka väldigt resurskrävande, tyder siffror från Toyota på det motsatta, att SBCE faktiskt är en effektivare metod än många traditionella angreppssätt. Examensarbetet har delats in i tre faser. Dels har en omfattande informationssökning genomförts, med syfte att sammanställa tillgängligt material om SBCE. Därefter har en nulägesanalys av Scanias arbetssätt genomförts, vilken dock inte fann några spår av SBCE. Tillsammans har den insamlade teorin och empirin sammanställts och diskuterats, för att sedan utgöra grund för två presentationer. En sammanfattande presentation för KTH, samt ett omfattande utbildningsmaterial för internt användande på Scania, vilket således inte inkluderats i denna rapport. Ett ytterligare övergripande mål fanns: att utföra examensarbetet med ett SBCE angreppssätt, samt reflektera över huruvida angreppssättet är lämpligt för liknande examensarbeten. Tyngdpunkten på detta examensarbete har dock varit att sammanställa och presentera tillgängligt material kring SBCE. Slutsatserna för examensarbetet utgår från litteraturens beskrivning. Det konstaterades att väsentliga skillnader mellan SBCE och traditionell produktutveckling fanns, men hur stor betydelse SBCE har i praktiken för Toyotas framgångar är svårare att bedöma. Det ansågs också att SBCE i teorin kan fungera som både ett riskreducerande och kunskapsbyggande system för produktutveckling, men att SBCE för maximal potential bör kompletteras och stödjas med ett antal andra metoder, system och verktyg.
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Marchese, Mecklenburg Mario. "Hydrodynamic study of a downwards concurrent bubble column." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61167.
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The hydrodynamics of the downwards concurrent flotation column (CDFC) of the Jameson design has been studied. The effect of operating variables on the gas holdup in two- and three-phase mixtures was measured. To measure gas holdup, the isolating technique, conductivity and pressure techniques were employed. Gas fractions between 10 and 65% were achieved. These high holdups are a consequence of bubbles being forced downwards against their buoyancy. The high gas fraction may account for the fast flotation claimed for this cell.The conductivity technique using Maxwell's equation gave a maximum error of 6%, in both two- and three-phase systems (considering the water-solids mixture as one phase).
The drift flux model was applied to try to correlate the data. Both two- and three-phase systems showed consistent trends. The model was used to estimate bubble size. In the Richardson and Zaki equation the m factor was in the range 2.9 to 3.1. A dimensionless drift flux was defined assuming $m=3$ which fitted the data. For three-phase systems, however, the results predicted a trend in bubble size that seemed opposite to observation. (Abstract shortened by UMI.)
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Coker, Jason George. "A simulation-based analysis of concurrent engineering applications in the architecture, engineering and construction industry." Connect to online resource, 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1447657.
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Ayers, Christopher Lee. "Concurrent processing of finite element calculations." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/13072.
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AbulHassan, Hisham S. "A framework for applying concurrent engineering principles to the construction industry." Full text available online (restricted access), 2001. http://images.lib.monash.edu.au/ts/theses/AbulHassan.pdf.
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Kumpf, Eric Paul Rutter Russell. "Visual rhetoric, concurrent discourses, and the design of student engineering documents." Normal, Ill. Illinois State University, 2001. http://wwwlib.umi.com/cr/ilstu/fullcit?p3064495.
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Thesis (Ph. D.)--Illinois State University, 2001.Title from title page screen, viewed March 23, 2006. Dissertation Committee: Dissertation Committee: Russell Rutter (chair), James Kalmbach, Kenneth Lindblom. Includes bibliographical references (leaves 167-171) and abstract. Also available in print.
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Musgrave, Kenneth C. "A multi-disciplinary, concurrent engineering, product development model for industrial design." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/22380.
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