为了解物流服务集成商(Logistics Service Integrator,LSI)通过物流服务供应链(Logistics Service Supply Chain,LSSC)获取资源的方法,根据获取资源类型的不同,将LSSC网络划分为社会关系网络、物流协作网络、物流创新网络、声誉网络、...为了解物流服务集成商(Logistics Service Integrator,LSI)通过物流服务供应链(Logistics Service Supply Chain,LSSC)获取资源的方法,根据获取资源类型的不同,将LSSC网络划分为社会关系网络、物流协作网络、物流创新网络、声誉网络、市场网络等5种子网络,运用实证方法对子网络间关系及各子网络对LSI绩效的影响进行检验.实证结果表明,物流创新网络和市场网络对LSI的绩效产生正向影响,声誉网络对LSI的绩效产生负向影响,社会关系网络和物流协作网络对LSI绩效的影响会通过他们对其他子网络的影响进行传递.各子网络之间存在相互重叠和影响:社会关系网络会影响市场网络和物流创新网络,物流协作网络会影响市场网络、声誉网络和物流创新网络,物流创新网络会影响声誉网络,声誉网络会影响市场网络.展开更多
A PI control strategy based on fuzzy set-point weighting following was proposed for the active damping control of a hydraulic crane boom system （HCBS）. Two valve-controlled PI controllers, which include a proportion...A PI control strategy based on fuzzy set-point weighting following was proposed for the active damping control of a hydraulic crane boom system （HCBS）. Two valve-controlled PI controllers, which include a proportional feedforward controller based on fuzzy set-point weighting following and a limited semi-integrator（LSI）, are designed respectively. LSI is used to limit output signal and to prevent wind up at the low frequency of the spectrum. By using a range camera and an electronic feedback control, the tip damping on the HCBS can be adjusted artificially. A collaborative control simulation technique of HOPSAN and MATLAB/SIMULINK is applied to the controller design. Simulation results show that the proposed PI control system has less overshoot as well as faster response. The tip damping on the HCBS during operation is improved.展开更多
文摘为了解物流服务集成商(Logistics Service Integrator,LSI)通过物流服务供应链(Logistics Service Supply Chain,LSSC)获取资源的方法,根据获取资源类型的不同,将LSSC网络划分为社会关系网络、物流协作网络、物流创新网络、声誉网络、市场网络等5种子网络,运用实证方法对子网络间关系及各子网络对LSI绩效的影响进行检验.实证结果表明,物流创新网络和市场网络对LSI的绩效产生正向影响,声誉网络对LSI的绩效产生负向影响,社会关系网络和物流协作网络对LSI绩效的影响会通过他们对其他子网络的影响进行传递.各子网络之间存在相互重叠和影响:社会关系网络会影响市场网络和物流创新网络,物流协作网络会影响市场网络、声誉网络和物流创新网络,物流创新网络会影响声誉网络,声誉网络会影响市场网络.
基金This work was supported by the Natural Science Foundation of Hunan Province(No.04JJ6033) and Scientific Research Fund of Hunan ProvincialEducation Department(No. 03C066).
文摘A PI control strategy based on fuzzy set-point weighting following was proposed for the active damping control of a hydraulic crane boom system （HCBS）. Two valve-controlled PI controllers, which include a proportional feedforward controller based on fuzzy set-point weighting following and a limited semi-integrator（LSI）, are designed respectively. LSI is used to limit output signal and to prevent wind up at the low frequency of the spectrum. By using a range camera and an electronic feedback control, the tip damping on the HCBS can be adjusted artificially. A collaborative control simulation technique of HOPSAN and MATLAB/SIMULINK is applied to the controller design. Simulation results show that the proposed PI control system has less overshoot as well as faster response. The tip damping on the HCBS during operation is improved.
