Advanced traveler information systems （ATIS） can not only improve drivers＇ accessibility to the more accurate route travel time information, but also can improve drivers＇ adaptability to the stochastic network cap...Advanced traveler information systems （ATIS） can not only improve drivers＇ accessibility to the more accurate route travel time information, but also can improve drivers＇ adaptability to the stochastic network capacity degradations. In this paper, a mixed stochastic user equilibrium model was proposed to describe the interactive route choice behaviors between ATIS equipped and unequipped drivers on a degradable transport network. In the proposed model the information accessibility of equipped drivers was reflected by lower degree of uncertainty in their stochastic equilibrium flow distributions, and their behavioral adaptability was captured by multiple equilibrium behaviors over the stochastic network state set. The mixed equilibrium model was formulated as a fixed point problem defined in the mixed route flows, and its solution was achieved by executing an iterative algorithm. Numerical experiments were provided to verify the properties of the mixed network equilibrium model and the efficiency of the iterative algorithm.展开更多
To explore the influence of intelligent highways and advanced traveler information systems(ATIS)on path choice behavior,a day-to-day(DTD)traffic flow evolution model with information from intelligent highways and ATIS...To explore the influence of intelligent highways and advanced traveler information systems(ATIS)on path choice behavior,a day-to-day(DTD)traffic flow evolution model with information from intelligent highways and ATIS is proposed,whereby the network reliability and experiential learning theory are introduced into the decision process for the travelers’route choice.The intelligent highway serves all the travelers who drive on it,whereas ATIS serves vehicles equipped with information systems.Travelers who drive on intelligent highways or vehicles equipped with ATIS determine their trip routes based on real-time traffic information,whereas other travelers use both the road network conditions from the previous day and historical travel experience to choose a route.Both roadway capacity degradation and travel demand fluctuations are considered to demonstrate the uncertainties in the network.The theory of traffic network flow is developed to build a DTD model considering information from intelligent highway and ATIS.The fixed point theorem is adopted to investigate the equivalence,existence and stability of the proposed DTD model.Numerical examples illustrate that using a high confidence level and weight parameter for the traffic flow reduces the stability of the proposed model.The traffic flow reaches a steady state as travelers’routes shift with repetitive learning of road conditions.The proposed model can be used to formulate scientific traffic organization and diversion schemes during road expansion or reconstruction.展开更多
This paper describes the modeling and simulation of the protocol of CCSDS advanced orbiting systems (AOS). The network features modeled in the implementation of CCSDS AOS are to multiplex different kinds of sources in...This paper describes the modeling and simulation of the protocol of CCSDS advanced orbiting systems (AOS). The network features modeled in the implementation of CCSDS AOS are to multiplex different kinds of sources into virtual channel data units ( VCDUs) in the data processing module. The emphasis of this work is placed on the algorithm for com-mutating VCDUs into physical channels in the form of continuous data stream. The objectives of modeling CCSDS AOS protocol are to analyze the performance of this protocol when it is used to process various data.展开更多
根据3GPP对4G无线通信系统性能提出的要求,通过系统建模,设计并搭建了LTE-Advanced无线通信系统仿真平台.该仿真平台主要包括地理拓扑、Wrap-around,大/小尺度衰落,干扰计算,自适应调制编码,HARQ,分组调度等功能模块.在仿真平台的建模...根据3GPP对4G无线通信系统性能提出的要求,通过系统建模,设计并搭建了LTE-Advanced无线通信系统仿真平台.该仿真平台主要包括地理拓扑、Wrap-around,大/小尺度衰落,干扰计算,自适应调制编码,HARQ,分组调度等功能模块.在仿真平台的建模过程中,应用了蒙特卡洛思想,对系统性能进行多次随机独立采样,统计采样结果作为有效数据.在VISUAL STUDIO 2008环境下搭建了LTE-Ad-vanced系统级仿真平台,并通过比较轮询算法和正比公平算法评估了仿真平台的性能,仿真结果表明,该系统级仿真平台达到了3GPP对系统设计的要求,为LTE-Advanced的标准化工作奠定了基础.展开更多
考虑冷热电多种负荷需求响应(Demand response, DR),引入碳排放成本,并以日总成本最小为目标,构建了一个含先进绝热压缩空气储能(Advanced adiabatic compressed air energy storage, AA-CAES)的冷电热综合能源系统(Integrated cold-ele...考虑冷热电多种负荷需求响应(Demand response, DR),引入碳排放成本,并以日总成本最小为目标,构建了一个含先进绝热压缩空气储能(Advanced adiabatic compressed air energy storage, AA-CAES)的冷电热综合能源系统(Integrated cold-electricity-heat energy system, ICEHS)优化运行模型。首先,考虑冷热电3种负荷的需求响应,对AA-CAES产生的电能、热能和冷能进行建模。其次,对源荷不确定性采用拉丁超立方采样与K-means聚类相结合的方法进行处理。最后,以ICEHS购能成本、运维成本、需求响应成本、碳排放成本之和最小为目标函数进行研究。以一个典型的社区综合能源系统作为算例,设置4种典型场景对所提模型的有效性进行验证。结果表明:AA-CAES和DR能有效降低ICEHS成本和碳排放量。展开更多
基金Projects(51378119,51578150)supported by the National Natural Science Foundation of China
文摘Advanced traveler information systems （ATIS） can not only improve drivers＇ accessibility to the more accurate route travel time information, but also can improve drivers＇ adaptability to the stochastic network capacity degradations. In this paper, a mixed stochastic user equilibrium model was proposed to describe the interactive route choice behaviors between ATIS equipped and unequipped drivers on a degradable transport network. In the proposed model the information accessibility of equipped drivers was reflected by lower degree of uncertainty in their stochastic equilibrium flow distributions, and their behavioral adaptability was captured by multiple equilibrium behaviors over the stochastic network state set. The mixed equilibrium model was formulated as a fixed point problem defined in the mixed route flows, and its solution was achieved by executing an iterative algorithm. Numerical experiments were provided to verify the properties of the mixed network equilibrium model and the efficiency of the iterative algorithm.
基金Project(71801115)supported by the National Natural Science Foundation of ChinaProject(2021M691311)supported by the Postdoctoral Science Foundation of ChinaProject(111041000000180001210102)supported by the Central Public Interest Scientific Institution Basal Research Fund,China。
文摘To explore the influence of intelligent highways and advanced traveler information systems(ATIS)on path choice behavior,a day-to-day(DTD)traffic flow evolution model with information from intelligent highways and ATIS is proposed,whereby the network reliability and experiential learning theory are introduced into the decision process for the travelers’route choice.The intelligent highway serves all the travelers who drive on it,whereas ATIS serves vehicles equipped with information systems.Travelers who drive on intelligent highways or vehicles equipped with ATIS determine their trip routes based on real-time traffic information,whereas other travelers use both the road network conditions from the previous day and historical travel experience to choose a route.Both roadway capacity degradation and travel demand fluctuations are considered to demonstrate the uncertainties in the network.The theory of traffic network flow is developed to build a DTD model considering information from intelligent highway and ATIS.The fixed point theorem is adopted to investigate the equivalence,existence and stability of the proposed DTD model.Numerical examples illustrate that using a high confidence level and weight parameter for the traffic flow reduces the stability of the proposed model.The traffic flow reaches a steady state as travelers’routes shift with repetitive learning of road conditions.The proposed model can be used to formulate scientific traffic organization and diversion schemes during road expansion or reconstruction.
文摘This paper describes the modeling and simulation of the protocol of CCSDS advanced orbiting systems (AOS). The network features modeled in the implementation of CCSDS AOS are to multiplex different kinds of sources into virtual channel data units ( VCDUs) in the data processing module. The emphasis of this work is placed on the algorithm for com-mutating VCDUs into physical channels in the form of continuous data stream. The objectives of modeling CCSDS AOS protocol are to analyze the performance of this protocol when it is used to process various data.
文摘根据3GPP对4G无线通信系统性能提出的要求,通过系统建模,设计并搭建了LTE-Advanced无线通信系统仿真平台.该仿真平台主要包括地理拓扑、Wrap-around,大/小尺度衰落,干扰计算,自适应调制编码,HARQ,分组调度等功能模块.在仿真平台的建模过程中,应用了蒙特卡洛思想,对系统性能进行多次随机独立采样,统计采样结果作为有效数据.在VISUAL STUDIO 2008环境下搭建了LTE-Ad-vanced系统级仿真平台,并通过比较轮询算法和正比公平算法评估了仿真平台的性能,仿真结果表明,该系统级仿真平台达到了3GPP对系统设计的要求,为LTE-Advanced的标准化工作奠定了基础.
文摘考虑冷热电多种负荷需求响应(Demand response, DR),引入碳排放成本,并以日总成本最小为目标,构建了一个含先进绝热压缩空气储能(Advanced adiabatic compressed air energy storage, AA-CAES)的冷电热综合能源系统(Integrated cold-electricity-heat energy system, ICEHS)优化运行模型。首先,考虑冷热电3种负荷的需求响应,对AA-CAES产生的电能、热能和冷能进行建模。其次,对源荷不确定性采用拉丁超立方采样与K-means聚类相结合的方法进行处理。最后,以ICEHS购能成本、运维成本、需求响应成本、碳排放成本之和最小为目标函数进行研究。以一个典型的社区综合能源系统作为算例,设置4种典型场景对所提模型的有效性进行验证。结果表明:AA-CAES和DR能有效降低ICEHS成本和碳排放量。
