Since the existing single-layer networked control systems have some inherent limitations and cannot effectively handle the problems associated with unreliable networks, a novel two-layer networked learning control sys...Since the existing single-layer networked control systems have some inherent limitations and cannot effectively handle the problems associated with unreliable networks, a novel two-layer networked learning control system (NLCS) is proposed in this paper. Its lower layer has a number of local controllers that are operated independently, and its upper layer has a learning agent that communicates with the independent local controllers in the lower layer. To implement such a system, a packet-discard strategy is firstly developed to deal with network-induced delay and data packet loss. A cubic spline interpolator is then employed to compensate the lost data. Finally, the output of the learning agent based on a novel radial basis function neural network (RBFNN) is used to update the parameters of fuzzy controllers. A nonlinear heating, ventilation and air-conditioning (HVAC) system is used to demonstrate the feasibility and effectiveness of the proposed system.展开更多
Reduction of falls of elderly people has been an active research area for many years.Falls of older people can be signicantly reduced through the smart use of technologies.Such technologies can help older people to re...Reduction of falls of elderly people has been an active research area for many years.Falls of older people can be signicantly reduced through the smart use of technologies.Such technologies can help older people to regain mobility and reduce their reliance on community care services.Therefore,mobility aids,as one of the main components of these assistive technologies,are mainly discussed in this paper.Recent obstacle detection systems and mobility aids will be reviewed in this paper,where different features are explicitly addressed.展开更多
基金Supported by National Natural Science Foundation of China(60774059)Project of Science &Technology Commission of Shanghaiunicipality(061107031,06DZ22011,06ZR14131)+1 种基金the Sunlight Plan Following Project of Shanghai Municipal Education Commission and Shanghai Edu-ational Development Foundation(06GG10)Shanghai Leading Academic Disciplines(T0103)
文摘Since the existing single-layer networked control systems have some inherent limitations and cannot effectively handle the problems associated with unreliable networks, a novel two-layer networked learning control system (NLCS) is proposed in this paper. Its lower layer has a number of local controllers that are operated independently, and its upper layer has a learning agent that communicates with the independent local controllers in the lower layer. To implement such a system, a packet-discard strategy is firstly developed to deal with network-induced delay and data packet loss. A cubic spline interpolator is then employed to compensate the lost data. Finally, the output of the learning agent based on a novel radial basis function neural network (RBFNN) is used to update the parameters of fuzzy controllers. A nonlinear heating, ventilation and air-conditioning (HVAC) system is used to demonstrate the feasibility and effectiveness of the proposed system.
基金Supported by the National High Technology Research and Development Program of China （No. 2003AA421030） and the National Science Foundation of China （No. 60375026）.
基金Shanghai Leading Academic Disciplines under Grant T0103Project of Science & Technology Commission of Shanghai Municipality under Grant 061107031 and 06ZR14131
文摘Reduction of falls of elderly people has been an active research area for many years.Falls of older people can be signicantly reduced through the smart use of technologies.Such technologies can help older people to regain mobility and reduce their reliance on community care services.Therefore,mobility aids,as one of the main components of these assistive technologies,are mainly discussed in this paper.Recent obstacle detection systems and mobility aids will be reviewed in this paper,where different features are explicitly addressed.
