Multi-product collaborative development is adopted widely in manufacturing enterprise, while the present multi-project planning models don＇t take techni- cal/data interactions of multiple products into account. To de...Multi-product collaborative development is adopted widely in manufacturing enterprise, while the present multi-project planning models don＇t take techni- cal/data interactions of multiple products into account. To decrease the influence of technical/data interactions on project progresses, the information flow scheduling models based on the extended DSM is presented. Firstly, infor- mation dependencies are divided into four types： series, parallel, coupling and similar. Secondly, different types of dependencies are expressed as DSM units, and the exten- ded DSM model is brought forward, described as a block matrix. Furthermore, the information flow scheduling methods is proposed, which involves four types of opera- tions, where partitioning and clustering algorithm are modified from DSM for ensuring progress of high-priority project, merging and converting is the specific computation of the extended DSM. Finally, the information flow scheduling of two machine tools development is analyzed with example, and different project priorities correspond to different task sequences and total coordination cost. The proposed methodology provides a detailed instruction for information flow scheduling in multi-product development, with specially concerning technical/data interactions.展开更多
A concurrent product development example is used in this paper to introduce a roadmap for integrated and concurrent product development. The roadmap covers the following steps: (1)enterprise problem specifying; (2)inf...A concurrent product development example is used in this paper to introduce a roadmap for integrated and concurrent product development. The roadmap covers the following steps: (1)enterprise problem specifying; (2)information integration modeling; (3)integrated products development team modeling; (4)product development process modeling; and (5) integrated information-process-organization modeling. They have been successfully applied in the major pilot project of "Concurrent Engineering" of the 863 Programme of China.展开更多
I read with interest the article entitled ＂Concurrent removal of intravitreal lens fragments afterphacoemulsification with pars plana vitrectomy prevents development of retinal detachment＂ by Chalam et al . In this ...I read with interest the article entitled ＂Concurrent removal of intravitreal lens fragments afterphacoemulsification with pars plana vitrectomy prevents development of retinal detachment＂ by Chalam et al . In this study, none of the patients developed retinal detachment （RD） during the one-year follow-up after concurrent removal lens fragments following phacoemulsification with pars plana vitrectomy （PPV）. The authors suggested that concurrent PPV for retained lens fragments after cataract surgery might prevent development of rhegmatogenous retinal detachment （RRD）, because early PPV prevents development of intraocular inflammation and inhibits vitreous contraction, a common cause of retinal tears and detachment.展开更多
Product development process management plays an important role in concurrent engineering (CE). The integration platform is a useful tool for effectively supporting the software development and integration. Based on th...Product development process management plays an important role in concurrent engineering (CE). The integration platform is a useful tool for effectively supporting the software development and integration. Based on the analysis of practical requirements for product development process management for CE, a CORBA-based integration platform of product development process management (IP-PDPM) is designed and developed. The design principles for IP-PDPM are described. The system architecture and functions of the platform are given, the key technologies for the implementation of IP-PDPM are presented, the application integration mechanism and its implementation techniques are also detailed.展开更多
Task decomposition is a kind of powerful technique increasingly being used within industry as a pathway for achieving product's developing success. In this paper, topology's concept in modern mathematics is us...Task decomposition is a kind of powerful technique increasingly being used within industry as a pathway for achieving product's developing success. In this paper, topology's concept in modern mathematics is used for task decomposition technique's deduction in product developing process. It puts fonvard the views of resolvability, measurability and connectivity of tasks and their practi-cal principles. Combined with an example of developing the typical mechanical product, it ex-plains the implementing method of task decomposition in Concurrent Engineering (CE).展开更多
This paper studies the scheduling of design projects in concurrent development process with uncertain number of feedback revisions. An optimization based methodology that combines heuristic algorithm, artificial intel...This paper studies the scheduling of design projects in concurrent development process with uncertain number of feedback revisions. An optimization based methodology that combines heuristic algorithm, artificial intelligence (fuzzy, genetic algorithm) and scheduling theory is developed. In the algorithm, weighting values of some key factors are defined by genetic algorithm. In addition, fuzzy logic is used to decide the ability coefficients of different roles taken by designers. Moreover, the process of pre-release and feedback revision is realized. Simulation example is a fraction of practical development project, and satisfied results are obtained.展开更多
Concurrent Engineering (CE) is an effective way for enterprises to reengineer the product development processes and to improve the product development abilities. In this paper, the existing status of product developme...Concurrent Engineering (CE) is an effective way for enterprises to reengineer the product development processes and to improve the product development abilities. In this paper, the existing status of product development in Chinese manufacturing industry is analyzed, and the requirements of manufacturing technology for them are investigated. An overview of our CE R&D work is introduced, including product modeling, DFA, DFM, QFD, PDM, and other enabling technologies. A case study of the CE pilot project is discussed. The industrial implementation and application in Chinese enterprises are summarized.展开更多
Software development process basically consists of phases, planned and executed in series: 1) feasibility study;2) requirements;3) design and 4) implementation, prior to production and maintenance. At the end of each ...Software development process basically consists of phases, planned and executed in series: 1) feasibility study;2) requirements;3) design and 4) implementation, prior to production and maintenance. At the end of each phase, there may be an official management decision (go/not go) depending upon cost, time or other reasons. Within each phase or across-phases, parallelism or concurrency can be achieved if modularity and/or independence of functionality exist(s). We propose a different approach to software development process that allows an improved parallel planning and execution of development effort beyond modularity and functionality independence. The goal is to shorten development time while possibly cutting cost and maintaining the same intended quality of performance. An example development is sketched.展开更多
Scheduling concurrent activities is of great significance to shorten development lead time and minimize the cost, a heuristic optimization scheduling approach therefore is proposed for concurrent product development p...Scheduling concurrent activities is of great significance to shorten development lead time and minimize the cost, a heuristic optimization scheduling approach therefore is proposed for concurrent product development process, in which some uncertain crucial parameters are determined by genetic algorithm (GA). To ensure the optimal concurrent scheduling and the effective utilization of resources along with the fluent delivery of information, some key factors such as time order, information, resources, lead time and overlapping time of activities are taken into account adequately, and the weights of these factors are fixed by GA. In addition, role allocation and feedback revision process are realized in optimization module. The simulation example is a part of a certain product development process, and the results show the feasibility of the algorithm.展开更多
基金Supported by National Natural Science Foundation of China(Grant Nos.51475077,51005038)Science and Technology Foundation of Liaoning China(Grant Nos.201301002,2014028012)
文摘Multi-product collaborative development is adopted widely in manufacturing enterprise, while the present multi-project planning models don＇t take techni- cal/data interactions of multiple products into account. To decrease the influence of technical/data interactions on project progresses, the information flow scheduling models based on the extended DSM is presented. Firstly, infor- mation dependencies are divided into four types： series, parallel, coupling and similar. Secondly, different types of dependencies are expressed as DSM units, and the exten- ded DSM model is brought forward, described as a block matrix. Furthermore, the information flow scheduling methods is proposed, which involves four types of opera- tions, where partitioning and clustering algorithm are modified from DSM for ensuring progress of high-priority project, merging and converting is the specific computation of the extended DSM. Finally, the information flow scheduling of two machine tools development is analyzed with example, and different project priorities correspond to different task sequences and total coordination cost. The proposed methodology provides a detailed instruction for information flow scheduling in multi-product development, with specially concerning technical/data interactions.
基金Supported by the High Technology Research and Development Programme of China
文摘A concurrent product development example is used in this paper to introduce a roadmap for integrated and concurrent product development. The roadmap covers the following steps: (1)enterprise problem specifying; (2)information integration modeling; (3)integrated products development team modeling; (4)product development process modeling; and (5) integrated information-process-organization modeling. They have been successfully applied in the major pilot project of "Concurrent Engineering" of the 863 Programme of China.
文摘I read with interest the article entitled ＂Concurrent removal of intravitreal lens fragments afterphacoemulsification with pars plana vitrectomy prevents development of retinal detachment＂ by Chalam et al . In this study, none of the patients developed retinal detachment （RD） during the one-year follow-up after concurrent removal lens fragments following phacoemulsification with pars plana vitrectomy （PPV）. The authors suggested that concurrent PPV for retained lens fragments after cataract surgery might prevent development of rhegmatogenous retinal detachment （RRD）, because early PPV prevents development of intraocular inflammation and inhibits vitreous contraction, a common cause of retinal tears and detachment.
文摘Product development process management plays an important role in concurrent engineering (CE). The integration platform is a useful tool for effectively supporting the software development and integration. Based on the analysis of practical requirements for product development process management for CE, a CORBA-based integration platform of product development process management (IP-PDPM) is designed and developed. The design principles for IP-PDPM are described. The system architecture and functions of the platform are given, the key technologies for the implementation of IP-PDPM are presented, the application integration mechanism and its implementation techniques are also detailed.
基金the State High-Tech Developmets Plan of Cina(No.863-511-9930-007)
文摘Task decomposition is a kind of powerful technique increasingly being used within industry as a pathway for achieving product's developing success. In this paper, topology's concept in modern mathematics is used for task decomposition technique's deduction in product developing process. It puts fonvard the views of resolvability, measurability and connectivity of tasks and their practi-cal principles. Combined with an example of developing the typical mechanical product, it ex-plains the implementing method of task decomposition in Concurrent Engineering (CE).
文摘This paper studies the scheduling of design projects in concurrent development process with uncertain number of feedback revisions. An optimization based methodology that combines heuristic algorithm, artificial intelligence (fuzzy, genetic algorithm) and scheduling theory is developed. In the algorithm, weighting values of some key factors are defined by genetic algorithm. In addition, fuzzy logic is used to decide the ability coefficients of different roles taken by designers. Moreover, the process of pre-release and feedback revision is realized. Simulation example is a fraction of practical development project, and satisfied results are obtained.
文摘Concurrent Engineering (CE) is an effective way for enterprises to reengineer the product development processes and to improve the product development abilities. In this paper, the existing status of product development in Chinese manufacturing industry is analyzed, and the requirements of manufacturing technology for them are investigated. An overview of our CE R&D work is introduced, including product modeling, DFA, DFM, QFD, PDM, and other enabling technologies. A case study of the CE pilot project is discussed. The industrial implementation and application in Chinese enterprises are summarized.
文摘Software development process basically consists of phases, planned and executed in series: 1) feasibility study;2) requirements;3) design and 4) implementation, prior to production and maintenance. At the end of each phase, there may be an official management decision (go/not go) depending upon cost, time or other reasons. Within each phase or across-phases, parallelism or concurrency can be achieved if modularity and/or independence of functionality exist(s). We propose a different approach to software development process that allows an improved parallel planning and execution of development effort beyond modularity and functionality independence. The goal is to shorten development time while possibly cutting cost and maintaining the same intended quality of performance. An example development is sketched.
文摘Scheduling concurrent activities is of great significance to shorten development lead time and minimize the cost, a heuristic optimization scheduling approach therefore is proposed for concurrent product development process, in which some uncertain crucial parameters are determined by genetic algorithm (GA). To ensure the optimal concurrent scheduling and the effective utilization of resources along with the fluent delivery of information, some key factors such as time order, information, resources, lead time and overlapping time of activities are taken into account adequately, and the weights of these factors are fixed by GA. In addition, role allocation and feedback revision process are realized in optimization module. The simulation example is a part of a certain product development process, and the results show the feasibility of the algorithm.
