视频编码新标准H.264中抗误码技术的研究

介绍了视频编码新标准———H .2 6 4中采用的几种抗误码技术 ,基于这些技术 ,新标准确保了压缩视频流在接收端的恢复质量。     

棉/氨纶弹力织物低温一浴法染色

通过一种新型染色助剂的应用，有效地降低了氨纶分散染料的染色温度，使棉/氨纶弹力织物能在较低的温度下实行散／活性一浴法同色性染色，获得满意的染色效果。     

Design of a 2-DOF-PID controller using an improved sine–cosine algorithm for load frequency control of a three-area system with nonlinearities

This paper proposes an improved sine–cosine algorithm (ISCA) based 2-DOF-PID controller for load frequency control. A three-area test system is built for study, while some physical constraints (nonlinearities) are considered for the investigation of a realistic power system. The proposed method is used as the parameter optimizer of the LFC controller in different scenarios. The 2-DOF-PID controllers are used because of their capability of fast disturbance rejection without significant increase of overshoot in set-point tracking. The 2-DOF-PID controllers’ efficacy is observed by examining the responses with the outcomes obtained with PID and FOPID controllers. The simulation results with the suggested scheme are correlated with some of the existing algorithms, such as SCA, SSA, ALO, and PSO in three different scenarios, i.e., a disturbance in two areas, in three areas, and in the presence of physical constraints. In addition, the study is extended to a four-area power system. Statistical analysis is performed using the Wilcoxon Sign Rank Test (WSRT) on 20 independent runs. This confirms the supremacy of the proposed method.     

基于RPR的高生存性网络

弹性分组环(RPR)技术定义了一种新型的媒体接入控制(MAC)层协议,采用了共享介质传输和空间复用协议以及低于50 ms的故障恢复保护的弹性机制,支持服务等级协定(SLA,Service Level Agreement),即插即用,基于MAC的高速交换,可承载具有突发性的IP业务,同时支持传统的语音传送,是未来城域网技术的重要发展方向.光纤技术的飞速发展使得RPR不再仅仅局限于城域网,还可以用于广域网.文章在基于RPR的低于50 ms的故障恢复保护的基础上,提出了具有高生存性的解决方案.     

弹性文件系统在电力信息系统的应用研究

信息技术和网络技术在电力工业中得到广泛应用的同时也带来了负面影响。文章介绍了电力信息系统安全的现状,在总结现有网络安全措施的基础上提出采用基于分片–冗余–分散(Fragmentation-Redundancy-Scattering,FRS)技术的弹性文件保护模型实现电力信息网络的容入侵,论述了相关技术及各个功能模块。最后将弹性文件模型应用于电力调度自动化系统中,并对该模型进行了分析和评价。     

未来光传送网核心技术展望

介绍光传送网技术的发展历程和现状，简述光传送网技术发展的一些观点，展望未来光传送网发展的核心技术。     

RPR在浙江江山供电局的应用

弹性分组环(RPR)是一种新的MAC层协议,是为优化数据包的传输而提出的技术,融合了现有以太网和SDH的技术优势,十分适合宽带接入网建设。文章以江山供电局兴建的RPR网络为议题,在介绍了美国络明公司RPR系统(本网主要设备)可提供的EPL、TPL、TLS等多个网络应用服务之后,着重讨论了江山供电局是如何根据RPR的不同业务目标,灵活选择上述不同的服务内容,构建数据网络;以及如何根据市场的发展变化,优化完善这些运行业务的。     

电力通信系统中的SDH自愈环组网及其应用探讨

SDH环形网络因其具有自愈能力的优点,常常用于电力系统中继网和重要的长途骨干网的建设,因而如何更好地解决环网的安全性问题则至关重要。文章简要介绍了基于SDH传输机制的自愈环保护系统,包括基本概念、工作原理、性能比较以及应用范围。具体阐述了SDH自愈环组网应用中存在的一些实际问题,并探讨了相应的技术措施和解决方法。     

弹性分组环业务队长的分析

弹性分组环(ResilientPacketRing,RPR)是刚被IEEE802.17标准化,主要用于城域网的新型MAC层协议,也是宽带IP光城域网技术的重要发展方向。RPR在结构上从属寄存器插入环,其缓存大小的设置对性能的影响很大。目前RPR缓存大小的设置主要借鉴Ethernet、ATM等其它网络的实际应用时经验或仿真结果,尚缺乏理论方面的研究。基于排队论,该文对RPR各缓存里业务的队长及其和吞吐量、节点数目的关系进行研究。所得结果和IEEE802.17所推荐的数值相近;同时还得到一个结论并值得关注:和目前RPR资料文献里的结论不同,理论推导结果表明,队长基本都不是随节点数目成线性关系的。     

Experimental validation of a resilient monitoring and control system

Complex, high performance, engineering systems have to be closely monitored and controlled to ensure safe operation and protect public from potential hazards. One of the main challenges in designing monitoring and control algorithms for these systems is that sensors and actuators may be malfunctioning due to malicious or natural causes. To address this challenge, this paper addresses a resilient monitoring and control (ReMAC) system by expanding previously developed resilient condition assessment monitoring systems and Kalman filter-based diagnostic methods and integrating them with a supervisory controller developed here. While the monitoring and diagnostic algorithms assess plant cyber and physical health conditions, the supervisory controller selects, from a set of candidates, the best controller based on the current plant health assessments. To experimentally demonstrate its enhanced performance, the developed ReMAC system is then used for monitoring and control of a chemical reactor with a water cooling system in a hardware-in-the-loop setting, where the reactor is computer simulated and the water cooling system is implemented by a machine condition monitoring testbed at Idaho National Laboratory. Results show that the ReMAC system is able to make correct plant health assessments despite sensor malfunctioning due to cyber attacks and make decisions that achieve best control actions despite possible actuator malfunctioning. Monitoring challenges caused by mismatches between assumed system component models and actual measurements are also identified for future work.