|Title:||An architecture for web-based distributed product data management|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Production management -- Data processing
Manufacturing processes -- Data processing
|Department:||Department of Industrial and Systems Engineering|
|Pages:||1 v. (various pagings) : ill. (some col.) ; 30 cm|
|Abstract:||Product data management (PDM) has been accepted as an important tool for the manufacturing industries. In recent years, more and more researches have been conducted in the development of PDM. Their research areas include system design, integration of object-oriented technology, data distribution, collaborative and distributed manufacturing working environment, security, and web-based integration. However, there are limitations on their researches. In particular, they cannot cater for PDM indistributed manufacturing environment. This thesis, thus, attempts to contribute a new PDM solution for the global manufacturing era. In system design, development and implementation, a formal specification is necessary. However, there is no formal representation model for PDM system, therefore a graphical representation model is constructed to express the various scenarios of interactions between users and the PDM system. State chart is then used to model the operations of PDM system. State chart model bridges the current gap between requirements, scenarios, and the initial design specifications of PDM system. After properly analyzing the PDM system, a new distributed PDM (DPDM) system is proposed. Both graphical representation and state chart models are constructed for the new DPDM system. New product data of DPDM and new system functions are then investigated to support product information flow in the new distributed environment. A popular Object Modeling Technique (OMT) is used to model the object characteristic domain of product data. The proposed product data model explains the relationship between the product data and the various activities in the new DPDM system. It presents a product data modeling framework for DPDM system. The DPDM product data model includes object model, functional model and dynamic model. Since the allocation of object in a distributed manufacturing environment is a critical issue, therefore object allocation objectives for DPDM are set to facilitate object distribution decision making. In addition, a comprehensive mathematical model is developed to minimize the DPDM system operation cost, response time, remote object request rate, and storage cost. Replication and migration techniques for product data object distribution in the new DPDM system are also discussed. Since there are limitations in existing PDM system for the contemporary distributed and collaborative environment, a categorized stratified workspace architecture is proposed. The categorized features of the stratified workspaces can bring major benefits to security and version management. In addition, how stratified workspace can improve and increase both local and remote data sharing when integrated with web technologies is discussed. In dealing with the tremendous amount of interactions between the DPDM system and the various users, the most importance is to ensure that all data are secured and all users are under controlled and managed. The prominent supporting features in DPDM system such as user organization, workspace and security are thus analyzed. A mixed approac haccess model for the system is proposed. In this model, the two main classical access control schemas, the Lampson's access matrix and the Bell-LaPadula's (BLP) security labels, are adapted for DPDM purpose. The implementation aspects of the new DPDM system are then highlighted. The limitations of the statechart modeling method, product data model, object-oriented technology, product data allocation, stratified workspace and system security in DPDM system are discussed. Future research directions are also proposed. Finally, the thesis is concluded by summarizing the achievements developed for the proposed DPDM system.|
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