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The model for calculating the firm power of cascade hydropower stations is a large scale maxmin model, an efficient algorithm named effective calculating period algorithm (MM-NC-A) for simplifying the calculation of it is presented in this paper. The calculation results show that the proposed algorithm is very practical and efficient. 梯级水电站群长序列保证出力优化计算模型是一个大规模maxmin模型.本文针对梯级水电站群的特点给出一个行之有效的简化算法──有效计算期算法(MM—NC—A).计算结果表明该算法有效. The preventive maintenance support system for equipment based on reliability that distributed C/S structure was used is composed of user layer, application layer, and support layer. It includes corrective maintenance, periodic maintenance and preventive maintenance. The system knowledge base includes seven rule bases of reliability, maintainability, economy, testability, supportability, maintenance policy and control. When static and dynamic parameters were inputted, run reasoning and computing system to define... The preventive maintenance support system for equipment based on reliability that distributed C/S structure was used is composed of user layer, application layer, and support layer. It includes corrective maintenance, periodic maintenance and preventive maintenance. The system knowledge base includes seven rule bases of reliability, maintainability, economy, testability, supportability, maintenance policy and control. When static and dynamic parameters were inputted, run reasoning and computing system to define maintenance mode and type. And then use relational rules to compute reasonable maintenance period. 基于可靠性的装备预防性雏修支持系统采用C/S分布式结构,由用户、应用和支撑三层组成,包括事后维修、定时和视情况预防性维修。系统知识库包括可靠性、维修性、经济性、测试性、维修间隔期算法、维修方案及控制等规则库。输入静动态参数后进行预处理,调用推理计算系统,确定维修方式和类型,调用有关的规则,算出合理的维修间隔期。 Information collection is an important function of network management systems but traditional methods have some limitations in CORBA/SNMP gateway.The paper presents an efficient information collection policy(EICP) that includes a subscription competition algorithm,a deadline algorithm,and a self adaptive refresh algorithm.The system reduces network flow and response time by dynamically organizing the managed objects(MO) information tree,adaptively refreshing with the statistical collection frequency,and defining... Information collection is an important function of network management systems but traditional methods have some limitations in CORBA/SNMP gateway.The paper presents an efficient information collection policy(EICP) that includes a subscription competition algorithm,a deadline algorithm,and a self adaptive refresh algorithm.The system reduces network flow and response time by dynamically organizing the managed objects(MO) information tree,adaptively refreshing with the statistical collection frequency,and defining the validity with deadline.This paper demonstrates the system feasibility and efficiency with analyses and simulations. 信息采集是网络管理的一项重要职能。然而,CORBA/SNMP网关的传统方法存在着能动性差等效率低下的弊端。针对这一问题,提出一种高效信息采集策略(EICP),详细阐述了其核心算法——预约竞争算法、截止期算法、自适应更新算法等。EICP通过动态地组织和管理被管对象信息树资源,根据统计意义上的访问频率进行自适应地更新和预读取,以截止期定界被管对象信息的有效性,来达到减少网络流量和缩短响应时间的目的。给出了相应的数学分析和仿真结果,从理论上对EICP的可行性和高效性予以验证。
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