To support modular fixture assembly design in virtual environment,a multi-view based modular fixture virtual assembly model is proposed.Instead of squeezing all assembly related information into a single model,three c...To support modular fixture assembly design in virtual environment,a multi-view based modular fixture virtual assembly model is proposed.Instead of squeezing all assembly related information into a single model,three complementary views of assembly model,element information,function and structure,and assembly relationship are proposed to be used.The first view contains the detailed element information,while the other two explicitly capture the hierarchical function relationships and mating relationships respectively.These views are complementary in the sense that each view only contains a specific aspect of assembly related information while together they include required assembly related information.The proposed assembly model is specialized to accommodate the features of modular fixture virtual assembly design and applied in our developed prototype system.展开更多
This paper is devoted to a study of geometric properties of AR(q) nonlinear regression models. We present geometric frameworks for regression parameter space and autoregression parameter space respectively based on th...This paper is devoted to a study of geometric properties of AR(q) nonlinear regression models. We present geometric frameworks for regression parameter space and autoregression parameter space respectively based on the weighted inner product by fisher information matrix. Several geometric properties related to statistical curvatures are given for the models. The results of this paper extended the work of Bates & Watts(1980,1988)[1.2] and Seber & Wild (1989)[3].展开更多
This research aimed to determine instruments for analysis of knowledge management in operators companies of metropolitan transport systems. How much the goal was an exploratory research, how much the procedure was a l...This research aimed to determine instruments for analysis of knowledge management in operators companies of metropolitan transport systems. How much the goal was an exploratory research, how much the procedure was a literature search, how much as nature was an applied research, and how much as approach was qualitative research？ The following instruments were identified and selected： （a） the methodology for the analysis of metropolitan transport systems; （b） the knowledge management maturity model （Siemens）; and （c） Documentation and Information Centre. The simulation, using the tools in the knowledge management to analyze the Company Metropolitan of S^io Paulo--METRO, identified the need for improvements in eight areas and the problems： （1） rethink the knowledge management area; （2） develop new knowledge management policies; （3） define responsibilities in knowledge management area; （4） implement new knowledge management processes; （5） explore new ways and structures of knowledge; （6） consider the internal and external actors in knowledge management actions; （7） expand the dissemination of the collaborative culture; and （8） integrate in the knowledge management area current and future initiatives. The analysis shows that the transposition of the current situation to the desired situation for the company can be obtained with the implementation of an Information and Documentation Centre. The conclusion is that this set of tools allows to characterize, evaluate, and model the knowledge management in this business.展开更多
CPS （cyber-physics system） engineering brings new revolutionary opportunities for multi-disciplinary and complex processes, like oil extraction from oil sands. Based on an established unified feature modeling scheme...CPS （cyber-physics system） engineering brings new revolutionary opportunities for multi-disciplinary and complex processes, like oil extraction from oil sands. Based on an established unified feature modeling scheme, a software modeling framework to simulate the process of SAGD （steam-assisted gravity drainage） is proposed. The main purpose of this work was to apply CPS in the complex production engineering informatics modeling as it applied to SAGD. Existing physics models and simulation algorithms for main SAGD phenomena were reviewed, and an integrated ontology model via a feature-based approach has been developed. Conservation laws were used as the governing principles, while the transport phenomena were modelled via the primary phenomenon features. The representation of typical data flows targeting to the functional simulation scenarios by applying the concept of phenomenon features was also done. The definition of this feature type represents a new expansion of the emerging unified feature scheme for engineering software modeling. Slotted liners were taken as the well-completion option and their design and specifications were included in the case study model. The unique representation of the planned software design is developed and expressed with graphical diagrams of the UML （unified modelling language） convention.展开更多
文摘To support modular fixture assembly design in virtual environment,a multi-view based modular fixture virtual assembly model is proposed.Instead of squeezing all assembly related information into a single model,three complementary views of assembly model,element information,function and structure,and assembly relationship are proposed to be used.The first view contains the detailed element information,while the other two explicitly capture the hierarchical function relationships and mating relationships respectively.These views are complementary in the sense that each view only contains a specific aspect of assembly related information while together they include required assembly related information.The proposed assembly model is specialized to accommodate the features of modular fixture virtual assembly design and applied in our developed prototype system.
基金Supported by the NSSFC(02BTJ001) Supported by the NSSFC(04BTJ002) Supported by the Grant for Post-Doctorial Fellows in Southeast University
文摘This paper is devoted to a study of geometric properties of AR(q) nonlinear regression models. We present geometric frameworks for regression parameter space and autoregression parameter space respectively based on the weighted inner product by fisher information matrix. Several geometric properties related to statistical curvatures are given for the models. The results of this paper extended the work of Bates & Watts(1980,1988)[1.2] and Seber & Wild (1989)[3].
文摘This research aimed to determine instruments for analysis of knowledge management in operators companies of metropolitan transport systems. How much the goal was an exploratory research, how much the procedure was a literature search, how much as nature was an applied research, and how much as approach was qualitative research？ The following instruments were identified and selected： （a） the methodology for the analysis of metropolitan transport systems; （b） the knowledge management maturity model （Siemens）; and （c） Documentation and Information Centre. The simulation, using the tools in the knowledge management to analyze the Company Metropolitan of S^io Paulo--METRO, identified the need for improvements in eight areas and the problems： （1） rethink the knowledge management area; （2） develop new knowledge management policies; （3） define responsibilities in knowledge management area; （4） implement new knowledge management processes; （5） explore new ways and structures of knowledge; （6） consider the internal and external actors in knowledge management actions; （7） expand the dissemination of the collaborative culture; and （8） integrate in the knowledge management area current and future initiatives. The analysis shows that the transposition of the current situation to the desired situation for the company can be obtained with the implementation of an Information and Documentation Centre. The conclusion is that this set of tools allows to characterize, evaluate, and model the knowledge management in this business.
文摘CPS （cyber-physics system） engineering brings new revolutionary opportunities for multi-disciplinary and complex processes, like oil extraction from oil sands. Based on an established unified feature modeling scheme, a software modeling framework to simulate the process of SAGD （steam-assisted gravity drainage） is proposed. The main purpose of this work was to apply CPS in the complex production engineering informatics modeling as it applied to SAGD. Existing physics models and simulation algorithms for main SAGD phenomena were reviewed, and an integrated ontology model via a feature-based approach has been developed. Conservation laws were used as the governing principles, while the transport phenomena were modelled via the primary phenomenon features. The representation of typical data flows targeting to the functional simulation scenarios by applying the concept of phenomenon features was also done. The definition of this feature type represents a new expansion of the emerging unified feature scheme for engineering software modeling. Slotted liners were taken as the well-completion option and their design and specifications were included in the case study model. The unique representation of the planned software design is developed and expressed with graphical diagrams of the UML （unified modelling language） convention.
