In this paper, the classical risk process perturbed by diffusion is generalized by allowing for “size fluctuation” and the ruin probability for this new model is discussed.
[Objective] The study aimed to assess the health state of rivers by using fuzzy matter-element model.[Method] Based on fuzzy matter-element analysis theory,the assessment model of river health was established,then a m...[Objective] The study aimed to assess the health state of rivers by using fuzzy matter-element model.[Method] Based on fuzzy matter-element analysis theory,the assessment model of river health was established,then a modified method to calculate the superior subordinate degree was put forward according to Hamming distance.Afterwards,a multi-level evaluation model,which contained the assessment indicators about hydrological features,ecological characteristics,environmental traits and service function,was set up based on this method above.Finally,the model was applied in the health assessment of Qinhuai River.[Result] The health state of Qinhuai River was at medium level.This assessment result was consistent with that of comprehensive index method,and it showed that the multi-level fuzzy matter-element model was effective in the assessment of river health.[Conclusion] The research provided an effective method to evaluate the state of river health.展开更多
This article discusses the problem of the detection of influential cases in nonlinear reproductive dispersion models (NRDM). A diagnostic based on case\|deletion approach in estimating equations is proposed. The relat...This article discusses the problem of the detection of influential cases in nonlinear reproductive dispersion models (NRDM). A diagnostic based on case\|deletion approach in estimating equations is proposed. The relationships between the generalized leverage defined by Wei et al. in 1998, statistical curvature, and the local influence of the response vector perturbations are investigated in NRDM. Two numerical examples are given to illustrate the results.展开更多
Difficulty in generalizing and lack of adapt ability are important factors that hamper a computer aided process planning (CAP P) system from being popular and practical. New manufacturing philosophies such as Concur...Difficulty in generalizing and lack of adapt ability are important factors that hamper a computer aided process planning (CAP P) system from being popular and practical. New manufacturing philosophies such as Concurrent Engineering require special characteristic of a CAPP system. Propose d in this paper is a CAPP framework system for Concurrent Engineering (CAPPFS C E) which can meet the requirements of Concurrent Engineering and whose informati on models, function models and decision logic can be customized by users to form various CAPP application systems. Its function requirements are discussed broadly. An architecture for CAPPFS CE is presented. It is based on abstract in formati on models (AIMs) and abstract function models (AFMs). The kernel is formed by cu stomization interpretation, internal process control and decision engine. A new information modeling and system development method, information element method ( IEM), is introduced to build up AIMs, decision engine, and AFMs and then realize a CAPPFS CE. THCAPP SHELL, a CAPPFS CE developed by IEM, is demonstrated. A CAPP system produced by customizing THCAPP SHELL for complex structural parts i n a concurrent engineering environment is shown.展开更多
文摘In this paper, the classical risk process perturbed by diffusion is generalized by allowing for “size fluctuation” and the ruin probability for this new model is discussed.
基金Supported by National Natural Science Foundation of China (50879018)Innovation Project of Jiangsu Province in 2008+1 种基金Special Fee for Scientific Research in Public Welfare Industry of Ministry of Water Resources (201001030)Special Fee of Key National Laboratories (1069-50987112)
文摘[Objective] The study aimed to assess the health state of rivers by using fuzzy matter-element model.[Method] Based on fuzzy matter-element analysis theory,the assessment model of river health was established,then a modified method to calculate the superior subordinate degree was put forward according to Hamming distance.Afterwards,a multi-level evaluation model,which contained the assessment indicators about hydrological features,ecological characteristics,environmental traits and service function,was set up based on this method above.Finally,the model was applied in the health assessment of Qinhuai River.[Result] The health state of Qinhuai River was at medium level.This assessment result was consistent with that of comprehensive index method,and it showed that the multi-level fuzzy matter-element model was effective in the assessment of river health.[Conclusion] The research provided an effective method to evaluate the state of river health.
文摘This article discusses the problem of the detection of influential cases in nonlinear reproductive dispersion models (NRDM). A diagnostic based on case\|deletion approach in estimating equations is proposed. The relationships between the generalized leverage defined by Wei et al. in 1998, statistical curvature, and the local influence of the response vector perturbations are investigated in NRDM. Two numerical examples are given to illustrate the results.
文摘Difficulty in generalizing and lack of adapt ability are important factors that hamper a computer aided process planning (CAP P) system from being popular and practical. New manufacturing philosophies such as Concurrent Engineering require special characteristic of a CAPP system. Propose d in this paper is a CAPP framework system for Concurrent Engineering (CAPPFS C E) which can meet the requirements of Concurrent Engineering and whose informati on models, function models and decision logic can be customized by users to form various CAPP application systems. Its function requirements are discussed broadly. An architecture for CAPPFS CE is presented. It is based on abstract in formati on models (AIMs) and abstract function models (AFMs). The kernel is formed by cu stomization interpretation, internal process control and decision engine. A new information modeling and system development method, information element method ( IEM), is introduced to build up AIMs, decision engine, and AFMs and then realize a CAPPFS CE. THCAPP SHELL, a CAPPFS CE developed by IEM, is demonstrated. A CAPP system produced by customizing THCAPP SHELL for complex structural parts i n a concurrent engineering environment is shown.
