In this paper, the properties of distributed virtual environment (DVE) and the requirements on computer networks is briefly reviewed. A multicast protocol, called sender initiated grouping multicast protocol for DVE...In this paper, the properties of distributed virtual environment (DVE) and the requirements on computer networks is briefly reviewed. A multicast protocol, called sender initiated grouping multicast protocol for DVE (SIGMP), is proposed. This new multicast protocol is based on a novel concept, multicast group (MG), which divides all participants in a DVE system into groups, among which there is a multicast group trustee (MGT) node to manage the group. The protocol provides unreliable/reliable, totally ordered and multiple to multiple multicast transmission service for DVE systems without sacrificing the communication efficiency heavily. At the same time, reliable unicast and one to multiple multicast transmission services are also supported. The performance analysis of the new protocols is also presented. Based on SIGMP, a simple demonstration of DVE system is designed and implemented. This demo system is running on several SGI workstations connected by a FDDI and Ethernet network.展开更多
Virtual reality (VR) is a rapidly developing technology that has a wide spectrum of industrial and commercial applications. Networked (distributed or shared) virtual environments (VE) are of growing interest to modern...Virtual reality (VR) is a rapidly developing technology that has a wide spectrum of industrial and commercial applications. Networked (distributed or shared) virtual environments (VE) are of growing interest to modern manufacturing industry; a dominating use of networked virtual manufacturing environments (VMEs) is on-line visualisation and collaborative control of 3D information. This has to be supported by real-time data transfer. To meet a broad range of common requirements for Internet-based VE communications, particularly for virtual manufacturing and collaborative design and control, this paper presents a networked virtual environment system that is designed to support networked virtual design and manufacturing. The system is implemented with manufacturing message specification (MMS) standards so as to integrate a range of manufacturing services into networked VEs over the Internet.展开更多
温控负荷(thermostatically controlled loads,TCLs)集群作为一种灵活的可调度资源,已成为促进电网经济运行和帮助电网恢复稳定的有力手段之一。然而,由于温控负荷单体功率小、位置分散且参数各异,给调度带来了困难。为了灵活利用数量...温控负荷(thermostatically controlled loads,TCLs)集群作为一种灵活的可调度资源,已成为促进电网经济运行和帮助电网恢复稳定的有力手段之一。然而,由于温控负荷单体功率小、位置分散且参数各异,给调度带来了困难。为了灵活利用数量庞大的负荷侧资源进行负荷跟随控制,该文建立温控负荷的虚拟电池模型和负荷集群的聚合模型,并提出基于双层分布式通信网络的控制策略。上层利用分布式交替方向乘子法(alternating direction method of multipliers,ADMM)来解决不同负荷聚合器的最佳跟随功率问题,以确保跟随效益最优;下层提出基于快速分布式平均一致性算法的深度神经网络(deep neural networks,DNN)的方法,使得聚合器内部的所有温控负荷以相等的虚拟电池荷电状态(state of charge,SoC)快速共享上层得到的跟随功率,并有效减少了通信数据量。不同时间尺度的算例验证提出的控制策略能够实现快速的负荷跟随,并保证用户侧的效益。展开更多
文摘In this paper, the properties of distributed virtual environment (DVE) and the requirements on computer networks is briefly reviewed. A multicast protocol, called sender initiated grouping multicast protocol for DVE (SIGMP), is proposed. This new multicast protocol is based on a novel concept, multicast group (MG), which divides all participants in a DVE system into groups, among which there is a multicast group trustee (MGT) node to manage the group. The protocol provides unreliable/reliable, totally ordered and multiple to multiple multicast transmission service for DVE systems without sacrificing the communication efficiency heavily. At the same time, reliable unicast and one to multiple multicast transmission services are also supported. The performance analysis of the new protocols is also presented. Based on SIGMP, a simple demonstration of DVE system is designed and implemented. This demo system is running on several SGI workstations connected by a FDDI and Ethernet network.
文摘Virtual reality (VR) is a rapidly developing technology that has a wide spectrum of industrial and commercial applications. Networked (distributed or shared) virtual environments (VE) are of growing interest to modern manufacturing industry; a dominating use of networked virtual manufacturing environments (VMEs) is on-line visualisation and collaborative control of 3D information. This has to be supported by real-time data transfer. To meet a broad range of common requirements for Internet-based VE communications, particularly for virtual manufacturing and collaborative design and control, this paper presents a networked virtual environment system that is designed to support networked virtual design and manufacturing. The system is implemented with manufacturing message specification (MMS) standards so as to integrate a range of manufacturing services into networked VEs over the Internet.
文摘温控负荷(thermostatically controlled loads,TCLs)集群作为一种灵活的可调度资源,已成为促进电网经济运行和帮助电网恢复稳定的有力手段之一。然而,由于温控负荷单体功率小、位置分散且参数各异,给调度带来了困难。为了灵活利用数量庞大的负荷侧资源进行负荷跟随控制,该文建立温控负荷的虚拟电池模型和负荷集群的聚合模型,并提出基于双层分布式通信网络的控制策略。上层利用分布式交替方向乘子法(alternating direction method of multipliers,ADMM)来解决不同负荷聚合器的最佳跟随功率问题,以确保跟随效益最优;下层提出基于快速分布式平均一致性算法的深度神经网络(deep neural networks,DNN)的方法,使得聚合器内部的所有温控负荷以相等的虚拟电池荷电状态(state of charge,SoC)快速共享上层得到的跟随功率,并有效减少了通信数据量。不同时间尺度的算例验证提出的控制策略能够实现快速的负荷跟随,并保证用户侧的效益。
