There has been lack of an efficient design and evaluation method for the multistage star switching(MSSS) architecture in which the ports' rates of each switching element(SE) are unequal.Thus,we identify and propos...There has been lack of an efficient design and evaluation method for the multistage star switching(MSSS) architecture in which the ports' rates of each switching element(SE) are unequal.Thus,we identify and propose a special MSSS(SMSSS) model for the first time,where all special SEs,known as basic switching modules(BSMs),are connected hierarchically into a tree profile.Unlike the existing investigations,each BSM in this model is characterized by one highrate port and several low-rate ports.This study focuses on the analysis,design and optimization of the SMSSS model.Moreover,we propose a novel BSM cost model which relates to its flux factor considered rarely in existing studies.Two examples are demonstrated to obtain the optimal structure parameters of the SMSSS system with a minimum overall cost.The comparison of the proposed SMSSS with similar fat tree structures indicates its relative advantages.展开更多
This paper deals with the use of optimal control techniques in large-scale water distribution networks. According to the network characteristics and actual state of the water supply system in China, the implicit model...This paper deals with the use of optimal control techniques in large-scale water distribution networks. According to the network characteristics and actual state of the water supply system in China, the implicit model, which may be solved by utilizing the hierarchical optimization method, is established. In special, based on the analyses of the water supply system containing variable-speed pumps, a software tool has been developed successfully. The application of this model to the city of Shenyang (China) is compared to experiential strategy. The results of this study show that the developed model is a very promising optimization method to control the large-scale water supply systems.展开更多
In order to solve the problem of weak power performance of vehicle equipped with continuously variable transmission(CVT) system working under transient operating conditions, a new CVT equipped with planetary gear mech...In order to solve the problem of weak power performance of vehicle equipped with continuously variable transmission(CVT) system working under transient operating conditions, a new CVT equipped with planetary gear mechanism and flywheel was researched, a design method of transmission parameter optimization was proposed, and the comprehensive matching control strategy was established for the new transmission system. Fuzzy controllers for throttle opening and CVT speed ratio were designed, and power performance and fuel economy of both vehicles respectively equipped with conventional CVT system and new transmission system wrere compared and analyzed by simulation. The results show that power performance and fuel economy of the vehicle equipped with new transmission system are better than that equipped with conventional CVT, thus the rationality of the parameter design method and control algorithm are verified.展开更多
The multi-stage supply chain optimization problem is an important subject for research. Syaxif et al. have studied the problem formulated by a 0-1 mixed integer linear programming model, and presented a st-GA （spanni...The multi-stage supply chain optimization problem is an important subject for research. Syaxif et al. have studied the problem formulated by a 0-1 mixed integer linear programming model, and presented a st-GA （spanning tree-based genetic algorithm） by using Priifer number representation as the solution method of the model. On the basis of the work done by Syarif et al., a rst-GA （revised st-GA ） to solve the multi-stage supply chain optimization problem, is presented in this paper by means of introducing new sym- metric encoding ＆ decoding procedures of Priifer number, and adopting new chromosome＇s decoding strategy, etc. To facilitate building related decision-making support system, a C language implementation method of the rst-GA is also presented in this paper. Numerical experiments have validated that the rst-GA has better performance than the st-GA.展开更多
基金supported by the National High-Tech Development Project (2012AA01A505)Key Issues of Terabit PTN Equipment R&D from the Ministry of Industry and Information Technology
文摘There has been lack of an efficient design and evaluation method for the multistage star switching(MSSS) architecture in which the ports' rates of each switching element(SE) are unequal.Thus,we identify and propose a special MSSS(SMSSS) model for the first time,where all special SEs,known as basic switching modules(BSMs),are connected hierarchically into a tree profile.Unlike the existing investigations,each BSM in this model is characterized by one highrate port and several low-rate ports.This study focuses on the analysis,design and optimization of the SMSSS model.Moreover,we propose a novel BSM cost model which relates to its flux factor considered rarely in existing studies.Two examples are demonstrated to obtain the optimal structure parameters of the SMSSS system with a minimum overall cost.The comparison of the proposed SMSSS with similar fat tree structures indicates its relative advantages.
基金This work has been partly funded by the National Natural Science Foundation of China(No.50078048).
文摘This paper deals with the use of optimal control techniques in large-scale water distribution networks. According to the network characteristics and actual state of the water supply system in China, the implicit model, which may be solved by utilizing the hierarchical optimization method, is established. In special, based on the analyses of the water supply system containing variable-speed pumps, a software tool has been developed successfully. The application of this model to the city of Shenyang (China) is compared to experiential strategy. The results of this study show that the developed model is a very promising optimization method to control the large-scale water supply systems.
基金Project(2011BA3019)supported by the Chongqing Natural Science Foundation,China
文摘In order to solve the problem of weak power performance of vehicle equipped with continuously variable transmission(CVT) system working under transient operating conditions, a new CVT equipped with planetary gear mechanism and flywheel was researched, a design method of transmission parameter optimization was proposed, and the comprehensive matching control strategy was established for the new transmission system. Fuzzy controllers for throttle opening and CVT speed ratio were designed, and power performance and fuel economy of both vehicles respectively equipped with conventional CVT system and new transmission system wrere compared and analyzed by simulation. The results show that power performance and fuel economy of the vehicle equipped with new transmission system are better than that equipped with conventional CVT, thus the rationality of the parameter design method and control algorithm are verified.
基金This work is supported by National Natural Science Foundation of China（70361002）, the Jiangxi Provincial Advanced Education Reform Project （GanJiaoGaoZi[2004] 100Hao）, the Project of Jiangxi Provincial Department of Education （GanJiaoJiZi[2007]10Hao）, and the Science Foundation of Nanchang University （04Z02914）.
文摘The multi-stage supply chain optimization problem is an important subject for research. Syaxif et al. have studied the problem formulated by a 0-1 mixed integer linear programming model, and presented a st-GA （spanning tree-based genetic algorithm） by using Priifer number representation as the solution method of the model. On the basis of the work done by Syarif et al., a rst-GA （revised st-GA ） to solve the multi-stage supply chain optimization problem, is presented in this paper by means of introducing new sym- metric encoding ＆ decoding procedures of Priifer number, and adopting new chromosome＇s decoding strategy, etc. To facilitate building related decision-making support system, a C language implementation method of the rst-GA is also presented in this paper. Numerical experiments have validated that the rst-GA has better performance than the st-GA.
