Many high performance database servers are becoming idle with the tax data being integrated to country tax data centers. We make use of the idle servers to set up a provincial tax Grid based on open Grid service archi...Many high performance database servers are becoming idle with the tax data being integrated to country tax data centers. We make use of the idle servers to set up a provincial tax Grid based on open Grid service architecture （OGSA）. We put forward practical methods to integrate databases, to define and create basic modular Grid services and apply agent to manage Grid services. This technical innovation scheme is of a service-oriented architecture （SOA） and succeeds in averting resources waste. Tests proved that it greatly improves the quality of tax services.展开更多
Maximum power point tracking(MPPT)systems are being developed to produce switching pulses with proper duty ratios for power switches to exert photovoltaic(PV)panels under maximum instantaneous generated power,usually ...Maximum power point tracking(MPPT)systems are being developed to produce switching pulses with proper duty ratios for power switches to exert photovoltaic(PV)panels under maximum instantaneous generated power,usually through a traditional DC-DC boost converter.The fundamental issue,particularly for micro-grid and small-scale green DC or AC energy applications,is that the voltage supplied by the MPPT boost converter is insufficient.In order to increase resulting MPP voltage,this research proposes a new high-voltage gain DC-DC boost converter for a cascade connection with an MPPT boost converter.Input side of the proposed converter employs a switched-inductor cell to reduce input current source ripples which is a critical problem in PV systems for high-reliability applications.Additionally,a switched-capacitor cell is used at the converter’s output side to boost voltage gain and reduce voltage stress across converter’s power switches,which is a crucial factor for longer life of PV panel and proposed converter components,particularly semiconductor devices.Performance of the converter is assessed while taking into account variations in irradiation and temperature brought on by changing weather conditions.A prototype converter at a laboratory scale is utilized and examined.Outcomes of hardware tests support the findings of theoretical and simulation studies.展开更多
In the past decade,several efforts around the world were started with the goal of introducing "smart metering" capabilities into the power grid.These efforts have spurred renewed interest in the design of ne...In the past decade,several efforts around the world were started with the goal of introducing "smart metering" capabilities into the power grid.These efforts have spurred renewed interest in the design of next generation Narrowband Power Line Communications(NB-PLC) transceivers.In the past few years,ITU-T and IEEE have standardized a family of next generation OFDM-based NB-PLC transceivers some of which are today being considered for massive deployments in Europe and Asia.This paper addresses the important role that PLC has not only for smart metering but also for many other Smart Grid applications,and also gives an overview of the main differences between these next generation NB-PLC standards.展开更多
Traffic information processing is very complicated because of dynamic, cooperative and distributed features. This paper describes the prototype system version 2.0 of Urban Traffic Information Service Application Grid ...Traffic information processing is very complicated because of dynamic, cooperative and distributed features. This paper describes the prototype system version 2.0 of Urban Traffic Information Service Application Grid (UTISAG), which is based on the previous version. In this version, a new architecture and more enhanced services are introduced, The. remarkable characteristic of the new system is providing dynamic information services for travelers by grid technology. Therefore, the key research includes integrating large multi-source traffic data, forecasting route status, simulating regional traffic flow parallelly, and implementing optimum dynamic travel scheme based on massive GPS data.展开更多
基金Supported by the National Natural Science Foun-dation of China (60425206)
文摘Many high performance database servers are becoming idle with the tax data being integrated to country tax data centers. We make use of the idle servers to set up a provincial tax Grid based on open Grid service architecture （OGSA）. We put forward practical methods to integrate databases, to define and create basic modular Grid services and apply agent to manage Grid services. This technical innovation scheme is of a service-oriented architecture （SOA） and succeeds in averting resources waste. Tests proved that it greatly improves the quality of tax services.
文摘Maximum power point tracking(MPPT)systems are being developed to produce switching pulses with proper duty ratios for power switches to exert photovoltaic(PV)panels under maximum instantaneous generated power,usually through a traditional DC-DC boost converter.The fundamental issue,particularly for micro-grid and small-scale green DC or AC energy applications,is that the voltage supplied by the MPPT boost converter is insufficient.In order to increase resulting MPP voltage,this research proposes a new high-voltage gain DC-DC boost converter for a cascade connection with an MPPT boost converter.Input side of the proposed converter employs a switched-inductor cell to reduce input current source ripples which is a critical problem in PV systems for high-reliability applications.Additionally,a switched-capacitor cell is used at the converter’s output side to boost voltage gain and reduce voltage stress across converter’s power switches,which is a crucial factor for longer life of PV panel and proposed converter components,particularly semiconductor devices.Performance of the converter is assessed while taking into account variations in irradiation and temperature brought on by changing weather conditions.A prototype converter at a laboratory scale is utilized and examined.Outcomes of hardware tests support the findings of theoretical and simulation studies.
文摘In the past decade,several efforts around the world were started with the goal of introducing "smart metering" capabilities into the power grid.These efforts have spurred renewed interest in the design of next generation Narrowband Power Line Communications(NB-PLC) transceivers.In the past few years,ITU-T and IEEE have standardized a family of next generation OFDM-based NB-PLC transceivers some of which are today being considered for massive deployments in Europe and Asia.This paper addresses the important role that PLC has not only for smart metering but also for many other Smart Grid applications,and also gives an overview of the main differences between these next generation NB-PLC standards.
文摘Traffic information processing is very complicated because of dynamic, cooperative and distributed features. This paper describes the prototype system version 2.0 of Urban Traffic Information Service Application Grid (UTISAG), which is based on the previous version. In this version, a new architecture and more enhanced services are introduced, The. remarkable characteristic of the new system is providing dynamic information services for travelers by grid technology. Therefore, the key research includes integrating large multi-source traffic data, forecasting route status, simulating regional traffic flow parallelly, and implementing optimum dynamic travel scheme based on massive GPS data.
