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Hu, Cheng Low Steven H. Low Steven H. "Concurrent system design using Flow /." Diss., Pasadena, Calif. : Caltech, 2007. http://resolver.caltech.edu/CaltechETD:etd-05252007-140855.
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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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Zhu, Xun. "Static verification of concurrent system design." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18732.
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Elaborating a correct design of a concurrent system is extremely difficult. In part this is due to the infinite number of possible system runtime behaviors that result from the concurrent (or pseudo-concurrent) execution of interacting processes or threads. Data consistency, deadlock, starvation and fairness issues are the most well-known problems encountered in concurrent systems. Accurate concurrent system design verification approaches require an expensive system runtime behavior analysis and consequently result in prohibitively high development costs (i.e. for testing). In this thesis we try to address this problem by presenting several static approaches that can help the developer of a concurrent system during the design phase. In the first part of the thesis we present an approach that can analyze an existing concurrent system design to detect potential deadlock situations. This is done by mapping object interaction diagrams such as sequence diagrams to System Synchronization Hasse diagrams, which are then analyzed to detect deadlock cycles. Since the approach is static, it is overly pessimistic, meaning that it is possible that the algorithm detects a deadlock that, in reality, cannot occur. On the other hand, if the algorithm cannot detect any deadlocks, the developer can be sure that the design is deadlock-free. In the second part of the thesis we show how a concurrency-enriched specification can be transformed into a system application-level consistent design. The approach starts with concurrency-aware OCL-based operation schemas that describe all system functionality using pre-, rely-, and post-conditions. These schemas are then mapped to Rely diagrams. Based on the rely diagrams, sequence diagrams describing the concurrent system design are elaborated. The approach uses locks to ensure consistency and deadlock freedom. We then further show how these locks can be used to enforce certain fairness policies. The usefulness of our approach is demonstratedL'élaboration d'une bonne architecture dans un système concurrent est une tâche extrêmement difficile. Ceci s'explique par un nombre infini de combinaison de comportement d'exécution possible causé par l'interaction des processus exécutant de fac¸on concurrente (ou pseudoconcurrente). La consistance de donnée, l'interblocage, l'insuffisance de ressources et le partage juste des ressources sont les problhmes les mieux connus dans les environnements concurrents. La vérification exacte d'une architecture de système concurrent est une solution très dispendieuse, nécessitant des analyses de comportement d'exécution qui s'avère beaucoup trop coûteux. Cette thèse adresse ce problème en proposant plusieurs techniques statiques qui peuvent aider un développeur d'un système concurrent pendant la phase d'analyse. Dans la première partie de cette thèse, nous présentons une technique qui permet d'analyser l'architecture d'un système concurrent existant pour y découvrir des situations potentielles d'interblockage. Cette analyse nécessité le mappage de diagrammes d'interaction d'objet, tel que les diagrammes de séquence, à des diagrammes de Synchronisation de Systhme Hasse, qui peuvent être analysés à leur tour pour y découvrir des interblockages. Puisque la technique est statique, elle est sur-pessimiste. Donc, elle peut trouver des interblockages qui n'existe pas vraiment. Cependant, si aucun interblockage est trouvé, alors le programmes peut être assuré qu'aucun interblockage ne s'y trouve. Dans la deuxième section de la thèse, nous démontrons comment des spécifications munies d'information concurrent, peut être transformées en spécification sans problème d'interblockage. Cette technique débute avec des schémas opérationnels OCL munies d'information concurrent, qui décrivent toutes les fonctionnalités du système avec les préconditions, les poste-conditions et les conditions de dépendance. Ces schémas sont alors mappés à$
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Chun-Kit, Kwong. "A computer-aided concurrent design system." Thesis, University of Warwick, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263309.
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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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Smith, Nigel. "A concurrent approach to component layout." Thesis, University of Newcastle Upon Tyne, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285937.
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Tan, Ah Kat, and n/a. "Product information management in concurrent design systems." University of Canberra. Design and Architecture, 2003. http://erl.canberra.edu.au./public/adt-AUC20050707.092604.
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In this thesis, the management of product information in concurrent design
systems has been investigated with particular reference to product
development in small and medium enterprise (SME) industry and design
education at polytechnic level in Singapore. From a critical review of the
relevant literature on product design and development processes,
concurrent engineering, concurrent design systems, product data
management and related methods, it is found that there is a clear need for a
new design of a system for organizing and managing product information
in a concurrent design environment in the above contexts. This finding has
led to the development of a conceptual rationale, termed the Design Tensor
Method, and the design and development of an innovative product
information management system called PRIMAS. PRIMAS is a systematic
methodology for the classification, organization, integration,
communication, storage and management of product information in the
product development process. A software prototype based on PRIMAS has
been subsequently developed. PRIMAS along with its conceptual principles
have been applied and tested in a product design project in a tertiary
educational institution and in two significant industrial product
development projects based respectively in two SMEs. Positive evaluation
feedback on PRIMAS has been obtained in these studies. The product
development projects investigated with PRIMAS have also produced
outcomes that meet the original specified design requirements. The
findings from this research have led to the conclusion that PRIMAS is a
viable product information management system that can be used effectively
for managing product information in concurrent design projects in SME
industry and design education. Substantial PRIMAS databases of useful
product information have been compiled for the product development
projects investigated with PRIMAS. Finally, recommendations are made for
future research.
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Wang, Xiao Bing. "Concurrent design towards global textile/apparel development." Thesis, University of Leeds, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427041.
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Barker, Robin. "A knowledge-level model for concurrent design." Thesis, Sheffield Hallam University, 2002. http://shura.shu.ac.uk/19314/.
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The concurrent approach to engineering design, concurrent design, implies that expert knowledge regarding a number of different downstream life-cycle perspectives (such as assembly, manufacture, maintainability etc) should all be considered at the design stage of a product's life-cycle. Extensive and valuable work has been done in developing computer aids to both the design and concurrent design processes. However, a criticism of such tools is that their development has been driven by computational considerations and that the tools are not based on a generally accepted model of the design process. Different models of design have been developed that fall into a number of paradigms, including cognitive and knowledge-level models. However, while there is no generally accepted cognitive model describing the way designers and design teams think, the concept of the knowledge-level has enabled a more pragmatic approach to be taken to the development of models of problem-solving activity. Different researchers have developed knowledge-level models for the design process, particularly as part of the CommonKADS methodology (one of the principal knowledge-based system development methodologies currently in use). These design models have significantly extended design thinking in this area. However, the models do not explicitly support the concurrent design process. I have developed top-down knowledge-level models of the concurrent design process by analysis of published research and discussions with academics. However some researchers have criticised models for design that are not based on analysis of 'real-life' design. Hence I wished to validate my top-down models by analysing how concurrent design actually occurs in a real-life industrial setting. Analysing concurrent design activity is a complex process and there are no definitive methodological guidelines as to the 'right way' to do it. Therefore I have developed and utilised a novel method of knowledge elicitation and analysis to develop 'bottom-up' models for concurrent design. This is based on a number of different approaches and was done in collaboration with a number of different design teams and organisations who are engaged in the concurrent design of mechanically based products. My resulting knowledge-level models are an original contribution to knowledge. They suggest that the concurrent design process consists of a number of discrete sub-tasks of propose, critique and negotiate. These models have been instantiated as generic model templates, using the modelling formalisms specified by CommonYADS. These models have been implemented on a software tool, the CommonKADS workbench, in order to provide support for developers of computer-based systems for concurrent design.
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Rangarajan, Bharadwaj. "Robust concurrent design of automobile engine lubricated components." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/18897.
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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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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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Strand, Knut Arne. "Concurrent Design Approach to the Design of Customized Corporate E-Learning." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19719.
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Background: In today's knowledge-based economy corporations have an increasing need for employees with appropriate competencies, and customized e-learning can be a means to cover some of this need. Higher education institutions (HEIs) can take part in this market by offering e-learning-based training and education customized to the needs of the corporate clients. There is, however, a variety of needs that should be taken into account to form sustainable e-learning courses and related training services for the students, and this implies that it is challenging to design e-learning deliverables customized for corporate clients. To succeed in developing holistic e-learning designs which cover most relevant requirements, participants representing different roles such as customer representatives, domain experts, pedagogues, technical experts, economists and market people, students, and people from the administration should be present in the design phase. Furthermore, these stakeholders should utilize modern computersupported cooperation, while they strive to produce high quality results in a time and cost effective manner. Concurrent design is an approach used to solve complex and interdisciplinary design issues in which interactions between different disciplines is essential to achieve optimal and comprehensive solution. This thesis considers the use of a concurrent design approach, when customized e-learning deliverables are designed and developed for corporate clients. It is a paper-based thesis which includes six scientific and peer-reviewed papers, besides four secondary papers that are not included in their entirety but only where general information is described. Aim: The overall research aim was to contribute with basic motivation, implementation experience, and requirements for practical realization, regarding methodological approaches for concurrent design of e-learning deliverables for corporate clients. The following research questions were answered: 1. Why should HEIs apply a concurrent design approach when they aim to deliver e-learning to corporate clients? 2. How should a concurrent design approach for the development of customized e-learning for corporate clients be materialized? That is to say, how should this approach initially be described, and how should it eventually be tested and evaluated? 3. What are the key requirements for a concurrent design approach to the design of customized e-learning for corporate clients? Methods: This study was inspired by design-based research, and various research methods that were suitable to answer the research questions faced as the project progressed, were utilized. This includes literature reviews, questionnaires, interviews, design science, action research, besides qualitative data analysis and coding of collected data. Contributions: The main contribution of this thesis is the concurrent design inspired methodological approach to the design of new e-learning solutions for corporate clients, which are customized to the current context and the project in question. The following contributions were identified: 1. Detected motivation and conditions for applying a concurrent design approach to the design of customized e-learning for corporate clients. 2. The concurrent e-learning design method; which includes a description of processes, roles, models, tools, a concurrent design facility, and an appropriate infrastructure. 3. Experience from using action research as a means of introducing new artifacts at higher education institutions. 4. Requirements and guidelines for concurrent design of customized corporate e-learning; which includes 16 principles of concurrent e-learning design and some additional prescriptive approaches that should be considered for distributed workspaces. Conclusions: It is the e-learning design processes and the corporate use of e-learning provided by higher education institutions, that forms the basis for this doctoral project. In this context, a concurrent design approach to the design of customized corporate e-learning is materialized. To a large extent this also concerns computer-supported cooperative work on a more general level. This thesis is thus a contribution in instructional design, which also provides experience regarding how technological solutions should be used and what requirements shall apply to solutions that support computer-supported cooperation in interdisciplinary design processes.
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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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Fortgang, Joel D. "Concurrent design of input shaping and vibration absorbers." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17130.
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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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Wei, Yu-Feng 1970. "Concurrent design for optimal quality and cycle time." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8859.
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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.Includes bibliographical references (p. 113-116).
Product and manufacturing system design are the core issues in product development and dominate the profitability of a company. In order to assess and optimize the product and manufacturing system design, an objective evaluation framework is needed. Despite the many existing tools for product and manufacturing system design, there is a missing link between the product design and the production performances under system variability. The goal of the thesis is to explore and understand the interactions among part design and tolerancing, processes and system variability, and system control decision, then provide an integrated model to assess the total cost in a system. This model will be used to aid part design, tolerancing, batching, as well as strategy analysis in process improvement. A two-stage modeling approach is used to tackle the problem: quality prediction and production prediction. The quality prediction model projects the process variations into the output quality variations at each manufacturing stage, then predict the yield rate from the stochastic behavior of the variations and the tolerance. The production prediction model projects the demand rate and variability, processing times and variability, yield rates and batch-sizes into the manufacturing cycle time and inventories. After the performances are predicted through the previous two models, concurrent optimization of part design, tolerance, and batch-sizes are achieved by varying them to find the minimum cost. A case study at Boeing Tube shop is used to illustrate this approach. The result shows that the costless decisions in part design, tolerancing, and batch- sizes can significantly improve the system performance. In addition, conducting them separately or without using the system performance as the evaluation criteria may only lead to the local optima.
by Yu-Feng Wei.
Ph.D.
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Khan, Mahmood A. "A design environment for deadlock-free concurrent software." Thesis, Aston University, 1992. http://publications.aston.ac.uk/8099/.
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Using current software engineering technology, the robustness required for safety critical software is not assurable. However, different approaches are possible which can help to assure software robustness to some extent. For achieving high reliability software, methods should be adopted which avoid introducing faults (fault avoidance); then testing should be carried out to identify any faults which persist (error removal). Finally, techniques should be used which allow any undetected faults to be tolerated (fault tolerance). The verification of correctness in system design specification and performance analysis of the model, are the basic issues in concurrent systems. In this context, modeling distributed concurrent software is one of the most important activities in the software life cycle, and communication analysis is a primary consideration to achieve reliability and safety. By and large fault avoidance requires human analysis which is error prone; by reducing human involvement in the tedious aspect of modelling and analysis of the software it is hoped that fewer faults will persist into its implementation in the real-time environment. The Occam language supports concurrent programming and is a language where interprocess interaction takes place by communications. This may lead to deadlock due to communication failure. Proper systematic methods must be adopted in the design of concurrent software for distributed computing systems if the communication structure is to be free of pathologies, such as deadlock. Therefore, the objective of this thesis is to ensure that processes do not deadlock due to communication failure. A software tool was designed and used to facilitate the production of fault-tolerant software for distributed concurrent systems. Where Occam is used as a design language then state space methods, such as Petri-nets, can be used in analysis and simulation to determine the dynamic behaviour of the software, and to identify structures which may be prone to deadlock so that they may be eliminated from the design before the program is ever run. This design software tool consists of two parts. One takes an input program and translates it into a mathematical model (Petri-net), which is used for modeling and analysis of the concurrent software. The second part is the Petri-net simulator that takes the translated program as its input and starts simulation to generate the reachability tree. The tree identifies `deadlock potential' which the user can explore further.
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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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McManus, John William. "Design and analysis techniques for concurrent blackboard systems." W&M ScholarWorks, 1992. https://scholarworks.wm.edu/etd/1539623824.
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Blackboard systems are a natural progression of Artificial Intelligence based systems into a more powerful problem solving technique. They provide a way for several highly specialized knowledge sources to cooperate to solve large, complex problems. Blackboard systems incorporate the concepts developed by rule-based and expert systems programmers and include the ability to add conventionally coded knowledge sources. The small and specialized knowledge sources are easier to develop and test, and are hosted on hardware specifically suited to the task that they are solving.;Designing and developing blackboard systems is a difficult process. The designer is attempting to balance several conflicting goals and achieve a high degree of concurrent knowledge source execution while maintaining both knowledge and semantic consistency on the blackboard. Blackboard systems have not attained their apparent potential because no established tools or methods exist to guide in their construction or analyze their performance.;The Formal Model for Blackboard Systems was developed to provide a formal method for describing a blackboard system. The formal model outlines the basic components of a blackboard system, and how the components interact. A set of blackboard system design tools has been developed and validated for implementing systems that are expressed using the formal model. The tools are used to test and refine a proposed blackboard system design before the design is implemented. The set of blackboard system design tools consists of a Knowledge Source Organizer, a Knowledge Source Input/Output Connectivity Analyzer, and a validated Blackboard System Simulation Model. My preliminary research has shown that the level of independence and specialization of the knowledge sources directly affects the performance of blackboard systems. Using the design, simulation, and analysis tools I developed a concurrent object-oriented blackboard system that is faster, more efficient, and more powerful than existing systems. The use of the design and analysis tools provided the highly specialized and highly independent knowledge sources required for my concurrent blackboard system to achieve its design goals.
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Wiegmann, Dirk. "An activity-based cost model for design-concurrent calculation." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-03032009-040709/.
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Garufi, David (David J. ). "Error propagation in concurrent product development." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118550.
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Thesis: S.M. in Engineering and Management, Massachusetts Institute of Technology, System Design and Management Program, 2018.Cataloged from PDF version of thesis.
Includes bibliographical references (page 68).
System dynamics modelling is used to explore varying levels of concurrency in a typical design-build-produce project introducing a new product. Faster product life-cycles and demanding schedules have introduced the importance of beginning downstream work (build/manufacturing) while upstream work (design) is incomplete. Conceivably, this project concurrency improves project schedule and cost by forcing rework to be discovered and completed earlier in the project life. Depending on the type of project, some design errors may only be discoverable once the build phase has begun its work. Namely, systemic errors and assembly errors that cannot be easily discovered within the design phase. Pushing build activity earlier in the project allows the rework to be discovered earlier in the project, shortening the overall effort required to complete the project. A mathematical simulation, created using Vensim@ system modeling software, was created by James Lyneis to simulate two-phase rework cycles. The model was tuned to match data based on a disguised real project. Various start dates (as a function of project percentage complete) for downstream phases were explored to find optimal levels of concurrency. Project types were varied by exploring three levels of "rework discoverable within the design phase" to cover a range of project types. The simulation found that for virtually all project types, significant schedule and effort benefits can be gained by introducing the downstream phase as early as 30% to 40% into the project progress and ramping downstream effort over an extended period of time.
by David Garufi.
S.M. in Engineering and Management
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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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Williams, Christopher Bryant. "Platform design for customizable products and processes with non-uniform demand." Thesis, Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04082004-180453/unrestricted/williams%5fchristopher%5fb%5f200312%5fms.pdf.
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Zhang, Fengdong. "Distributed database and knowledge base modeling for concurrent design." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ65016.pdf.
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Athreya, Prahlad S. "The CAD query language towards design-concurrent cost estimation /." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1177523234.
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Martin, Jeremy Malcolm Randolph. "The design and construction of deadlock-free concurrent systems." Thesis, University of Buckingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601333.
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Throughout our lives we take for granted the safety of complex structures that surround us. We live and work in buildings with scant regard for the lethal currents of electricity and flammable gas coarsing through their veins. We cross high bridges with little fear of them crumbling into the depths below. We are secure in the knowledge that these objects have been constructed using sound engineering principles. Now, increasingly, we are putting OUT lives into the hands of complex computer programs. One could cite aircraft control systems, railway signalling systems, and medical databases as examples. But whereas the disciplines of electrical and mechanical engineering have long been well understood, software engineering is in its infancy. Unlike other fields, there is no generally accepted certification of competence for its practitioners. Formal scientific methods for reliable software production have been developed, but these tend to require a level of mathematical knowledge beyond that of most programmers. Engineers, in general, are usually more concerned with practical issues than with the underlying scientific theory of their particular discipline. They want to get on with the business of building powerful systems. They rely on scientists to provide them with safety rules which they can incorporate into their designs. For instance, a bridge designer needs to know certain formulae to calculate how wide to set the span of an arch - he does not need to know why the formulae work. Software engineering is in need of a battery of similar rules to provide a bridge between theory and practice. The demand for increasing amounts of computing power makes parallel programming very appealing. However additional dangers lurk in this exciting field. In this thesis we explore ways to circumvent one particularly dramatic problem - deadlock. This is a state where none of the constituent processes of a system can agree on how to proceed, so nothing ever happens. Clearly we would desire that any sensible system we construct could never arrive at such a state, but what can we do to ensure that this is indeed the case? We might think to use a computer to check every posssible state of the system. But, given that the number of states of a parallel system usually grows exponentially with the number of processes, we would most likely find the task too great.
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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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Lomax, Franklin Delano. "Application of Concurrent Development Practices to Petrochemical Equipment Design." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/26587.
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Principles of concurrent development are applied to the design of a small-scale device for converting natural gas or liquefied petroleum gas into hydrogen. The small hydrogen generator is intended for serial production for application in the production of industrial hydrogen, fueling stationary fuel cell power systems and refueling hydrogen-fueled fuel cell electric vehicles. The concurrent development process is contrasted with the traditional, linear development process for petrochemical systems and equipment, and the design is benchmarked against existing small hydrogen generators as well as industrial hydrogen production apparatus. A novel system and hardware design are described, and a single cycle of concurrent development is applied in the areas of catalyst development, thermodynamic optimization, and reactor modeling and design. The impact of applying concurrent development techniques is assessed through economic modeling, and directions for future development work are identified.Ph. D.
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Vigder, Mark (Mark Ronald) Carleton University Dissertation Engineering Electrical. "Applying formal techniques to the design of concurrent systems." Ottawa, 1992.
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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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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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Teoh, Ping Chow. "Failure modes and effects analysis for conceptual design." Thesis, Loughborough University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274905.
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Zheng, Tongsheng. "Concurrent solutions of large sparse linear systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0001/MQ42467.pdf.
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Eşit, Banu Ertok Özcan A. Can. "An Examination Of Design Processes Adopted By A Company Involved In Design-Based Manufacturing And Forming An Approach To An Optimum System: A Case Study In Teba-Günkol/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/endustriurunleritasarimi/T000353.pdf.
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Gayretli, Ahmet. "An expert system for supporting design consistency based on design for manufacturability." Thesis, De Montfort University, 1999. http://hdl.handle.net/2086/4211.
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Kamara, John Musa. "Client requirements processing for concurrent life-cycle design and construction." Thesis, Teesside University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365454.
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Raudberget, Dag. "Industrial Experiences of Set-based Concurrent Engineering- Effects, results and applications." Licentiate thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH. Forskningsmiljö Produktutveckling - Datorstödd konstruktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-20149.
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During product development, most of the customer value, as well as the cost and the quality of a product are defined. This key role of development in industry has led to an intense search for better ways to develop products, software, services and systems. One development methodology that has received positive attention is Set-Based Concurrent Engineering (SBCE). Some authors claim that SBCE and related practices from Lean Development are four times more productive than traditional development models. Unfortunately, SBCE is also described as hard to implement. This thesis presents the results of a three year research project aimed at implementing and describing the effects of Set-Based Concurrent Engineering in industry. The scope of the research is to use the principles of SBCE as a means to improve the productivity of industrial product development processes and its resulting products. The contribution of this work is a better understanding of Set-Based Concurrent Engineering and a support to implement its principles. The results show that SBCE gives positive effects on many aspects of product development performance and on the resulting products. The improvements are especially dominant on product performance, product cost and the level of innovation Moreover, a comparison between a Set-based decision process and a traditional matrix for design evaluation is presented, showing that these two approaches generate different results. The matrix evaluation promoted the development of new technology and the Set-based process promoted a thorough understanding of the important design parameters of the current designs. Finally, this work presents a structured design process and computer tool for implementing the principles of SBCE. The process was demonstrated by using information from an industrial development project, showing how the proposed process could implement the three principles of SBCE in a traditional Point-based development environment.
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Chae, Junjae. "Concurrent design of facility layout and flow-based department formation." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1606.
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The design of facility layout takes into account a number of issues including the formation of departments, the layout of these, the determination of the material handling methods to be used, etc. To achieve an efficient layout, these issues should be examined simultaneously. However, in practice, these problems are generally formulated and solved sequentially due to the complicated nature of the integrated problem. Specifically, there is close interaction between the formation of departments and layout of these departments. These problems are treated as separate problems that are solved sequentially. This procedure is mainly due to the complexity of each problem and the interrelationships between them. In this research, we take a first step toward integrating the flow-based department formation and departmental layout into comprehensive mathematical models and develop appropriate solution procedures. It is expected that these mathematical models and the solution procedures developed will generate more efficient manufacturing system designs, insights into the nature of the concurrent facility layout problem, and new research directions.
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Chang, Yong Jun. "Design of concurrent cooperative transmission systems on software-defined radios." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50360.
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Concurrent cooperative transmission (CCT) occurs when a collection of power-constrained single-antenna radios transmit simultaneously to form a distributed multi-input and multi-output (DMIMO) link. DMIMO can be a means for highly reliable and low-latency cooperative routing, when the MIMO channel is exploited for transmit and receive diversity; in this context, the range extension benefit is emphasized. Alternatively, DMIMO can be a means for high-throughput ad hoc networking, when the MIMO channel is used with spatial multiplexing. In both cases, concatenated DMIMO links are treated.
The key contribution of this dissertation is a method of pre-synchronization of distributed single-antenna transmitters to form a virtual antenna array, in the absence of a global clock, such as a global positioning system (GPS) receiver or a network time protocol (NTP) to provide reference signals for the synchronization. Instead, the reference for synchronization comes from a packet, transmitted by the previous virtual array and simultaneously received by all the cooperative transmitters for the next hop. The method is realized for two types of modulation: narrowband non-coherent binary frequency-shift keying (NCBFSK) and wideband orthogonal frequency division multiplexing (OFDM). The pre-synchronization algorithms for transmission are designed to minimize the root-mean-square (RMS) transmit time, sampling and carrier frequency error between cooperative transmitters, with low implementation complexity.
Since CCT is not supported by any existing standard or off-the-shelf radios, CT must be demonstrated by using software-defined radios (SDRs). Therefore, another contribution is a fully self-contained and real-time SDR testbed for CCT-based networking. The NCBFSK and OFDM systems have been designed and implemented in C++ and Python programming languages in the SDR testbed, providing practical performance of the CCT-based systems.
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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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Hughes, Andrew John. "DynamiTE : a 21st-century framework for concurrent component-based design." Thesis, University of Sheffield, 2010. http://etheses.whiterose.ac.uk/10653/.
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The free ride for software developers is over. In the past, computer programs have increased in performance simply by running on new hardware with ever increasing clock speeds. Now, however, this line of development has reached its end and chip designers are producing new processors, not with faster clocks, but with more cores. To take advantage of the speed increases offered by these new products, applications need to be redesigned with parallel processing firmly in mind. The problem is that mainstream designs are still inherently sequential. Concurrency tends to be an afterthought that may be useful to gain a performance boost, not an essential part of the design process. The current vogue for object-oriented designs tends to also have the side-effect of making them heavily data-oriented which doesn't scale well; each shared element of data has to be protected from simultaneous access, resulting in operations becoming sequential again. In addition, the usual methods for protecting data tend to be very low-level and error-prone. In this thesis, we introduce a new design method whereby applications are constructed from small sequential tasks connected by intercommunication primitives. Our approach is based on a two-stage process; first, the individual tasks are created as independent entities and tested with appropriate inputs, then secondly, the communication infrastructure between them is developed. We provide support for the latter via the DynamiTE framework, which allows the interactions to be defined using the terms of a process calculus. Depending on the developer's background, they can treat this as just another API, as a design pattern or as an algebraic expression which can be property checked for issues such as deadlocks. Either way, the communication layer can be developed, tested and evaluated separately from the tasks once it is known how the tasks will interface with one another. To supplement DynamiTE, we define our own process calculus, Nomadic Time, using a carefully chosen novel selection of constructs. Among the features of the calculus are the ability to perform communication both locally (one-to-one) and globally (one-to-many), and the flexibility to change the location of tasks during execution. Security is paramount to the design of Nomadic Time and migratory operations can be limited in two ways; by simple enumeration of possibilities or by the optional typing of constructs to allow restriction on a task-by-task basis. While it can't eradicate all the problems inherent in designing concurrent applications, DynamiTE can make things easier by reducing the dependency on shared resources and enhancing the reusability of concurrent components.
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Duke, Alistair K. "A telepresence environment for concurrent life-cycle design and construction." Thesis, Loughborough University, 2001. https://dspace.lboro.ac.uk/2134/34586.
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Construction projects normally involve transient 'virtual organisations', where a multidisciplinary project team works together on the design and construction of a facility. Many of these participants often work independently while taking decisions that inevitably affect others. The research described in the thesis involved examining the adoption of concurrent engineering (CE) principles by the construction industry as a way to reduce the problems posed by the fragmentation of the industry, and to enhance its competitiveness. An important aspect of concurrent engineering in construction is the need for effective communication of design information between all members of the project team and across all stages of the constructed facility's life-cycle. The thesis describes the development of a communications infrastructure for Concurrent Life-Cycle Design and Construction.
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Tyll, Jason Scott. "Concurrent Aerodynamic Shape / Cost Design Of Magnetic Levitation Vehicles Using Multidisciplinary Design Optimization Techniques." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/40514.
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A multidisciplinary design optimization (MDO) methodology is developed to link the aerodynamic shape design to the system costs for magnetically levitated (MAGLEV) vehicles. These railed vehicles can cruise at speeds approaching that of short haul aircraft and travel just inches from a guideway. They are slated for high speed intercity service of up to 500 miles in length and would compete with air shuttle services. The realization of this technology hinges upon economic viability which is the impetus for the design methodology presented here. This methodology involves models for the aerodynamics, structural weight, direct operating cost, acquisition cost, and life cycle cost and utilizes the DOT optimization software. Optimizations are performed using sequential quadratic programming for a 5 design variable problem. This problem is reformulated using 7 design variables to overcome problems due to non-smooth design space. The reformulation of the problem provides a smoother design space which is navigable by calculus based optimizers. The MDO methodology proves to be a useful tool for the design of MAGLEV vehicles. The optimizations show significant and sensible differences between designing for minimum life cycle cost and other figures of merit. The optimizations also show a need for a more sensitive acquisition cost model which is not based simply on weight engineering. As a part of the design methodology, a low-order aerodynamics model is developed for the prediction of 2-D, ground effect flow over bluff bodies. The model employs a continuous vortex sheet to model the solid surface, discrete vortices to model the shed wake, the Stratford Criterion to determine the location of the turbulent separation, and the vorticity conservation condition to determine the strength of the shed vorticity. The continuous vortex sheet better matches the mechanics of the flow than discrete singularities and therefore better predicts the ground effect flow. The predictions compare well with higher-order computational methods and experimental data. A 3-D extension to this model is investigated, although no 3-D design optimizations are performed.
NOTE: An updated copy of this ETD was added on 05/29/2013.Ph. D.
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Jefferies, A. S. "An incrementally compiled code approach to concurrent switch level logic simulation." Thesis, University of Kent, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374685.
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Ghiara, Karl J. Carleton University Dissertation Management Studies. "Skills, knowledge and training of design and manufacturing personnel in concurrent engineering teams." Ottawa, 1993.
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Arora, Aniket. "Concurrent consideration of product usability and functionality: Development of integrated design guidelines." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1289944199.
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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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Elsharnouby, Tamer Mahmoud. "SeSFJava a framework for design and assertion-testing of concurrent systems /." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/2968.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2005.Thesis research directed by: Computer Science. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.