ITSS运维系列标准与ISO/IEC20000标准的关系

在详细介绍ITSS运维系列标准和ISO/IEC 20000系列标准的内容及各部分标准之间关系的基础上,对两类标准从主要内容、核心原理、适用范围、未来发展方向,以及区别和联系等方面进行了详细分析.两类标准均为面向服务的标准,从实施角度看,它们之间不是等同关系,而是互相促进的关系.     

大气边界层观测系统的故障分析与维护研究

介绍了大理国家气候观象台建设的大气边界层（PBL）观测系统,并对该系统自运行以来出现的故障进行分析和总结。试图提出一套适用于PBL观测系统特点的局部故障的分析方法,该方法可以有效提高判断仪器出现故障和数据出现异常的效率,保障数据采集的完整性、可靠性和准确性,可供维护PBL观测系统的工程技术人员参考和借鉴。     

基于UML的电脑连锁店维修管理系统的建模

电脑连锁店维修管理系统能实现连锁店的信息化管理,帮助企业将更多信息通过现代信息技术进行统计、分析,以指导企业各方面工作。在需求分析过程中,将整个系统分为采购管理模块、维修管理模块、库存管理模块、系统维护等八个模块,使用统一建模语言UML对系统进行面向对象的分析和建模,创建了系统的静态模型和部署模型。     

装备维修保障模式优化研究

针对装备保障和现代战争的特点,分析了传统维修保障模式的不足,有针对性地从保障人员队伍建设、保障设备配置,以及保障资料整理、备品备件的管理和保障运作流程等方面提出了一些优化思路、基本途径及优化后的效果,对提高保障效率、降低保障成本有参考意义。     

Research and Design of Network Management Construction Based on Mobile AGENT

The technical characters of mobile agent （MA） originated in the distributional artificial intelligence domain is introduced. A network management construction based on agent （NMCA） is then proposed. The NMCA structure features are elaborated in detail. A prototype design of NMCA is given by using the jKQML programming. The establishment of NMCA platform will be helpful to reduce the correspondence load of network management and improves the efficiency and the expansion ability of network management systems.     

Role of dual SiOx: H based buffer at the p/i interface on the performance of single junction microcrystalline solar cells

In p-i-n structure a-Si solar cell a buffer layer with proper characteristics plays important role in improving the p/i interface of the cell, reducing mismatch of band gaps and number of recombination centres. However for p-i-n structure microcrystalline ( µc-Si: H) cell which has much less light induced degradation than a-Si:H cell, not much work has been done on development of proper buffer layer and its application to µc-Si:H cell. In this paper we have reported the development of two intrinsic oxide based microcrystalline layer having different characteristics for use as buffer layers at the p/i interface of µc-Si:H cell. Previously SiO_x:H buffer layer has been used at the p/i interface which showed positive effects. To explore the possibility of improving the performance of p-i-n structure µc-Si:H cell further we have thought it interesting to use two buffer layers with different characteristics at the p/i interface. The two buffer layers have been characterized in detail and applied at the p/i interface of the µc-Si:H cell with positive effects on all the PV parameters mainly improves the open circuit voltage (V_oc) and enhances short circuit current (I_sc). The maximum initial efficiency obtained is 8.97% with dual buffer which is 6.7% higher than that obtained by using conventional single buffer layer at the p/i interface. Stabilized efficiency of the cell with dual buffer is found to be ~9.5% higher than that with single buffer after 600 h of light soakings.     

Adaptive ABR congestion control with active buffer control

ATM Forum has defined that the ABR service is designed mainly for data traffic. The design of a simple and efficient congestion control scheme is a problem that network managers have to face. In this paper, we propose a control scheme for ABR service for better scalability and response. The scheme uses both the load level and an increase in queue length to detect the presence of congestion. Continuous control functions are designed for the bandwidth allocation. A better buffer control is achieved by incorporating the percentage of buffer occupancy into the control function. All of the control functions are designed in such a way that they are sensitive to the change of the system states when they are far from the optimal level to get a fast response, but insensitive and change slowly when the states are close to the optimal level to keep the system around the steady state. Our simulation results show that the algorithm is fair to all the connections and it converges fast when the network's condition changes. Copyright © 2001 John Wiley & Sons, Ltd.     

基于ITIL框架的面向视听新媒体运行维护指标体系研究

视听新媒体运行维护指标体系作为视听新媒体系统的重要组成和支撑部分,对于提高视听新媒体运行维护管理水平具有重要意义。在当前条件下应不断完善。本文参考ITIL的成熟实践经验,结合视听新媒体的技术特性,系统论述了构建该体系的背景、思路、主要内容、注意事项,希望能给相关运维团队提供技术建议。     

基于状态评估的相控阵雷达T/R组件维修策略研究

针对大型相控阵雷达T/R组件数量庞大、故障频发,且故障类型与多种检测参数有关的特点,提出了一种基于状态评估的T/R组件维修策略。根据T/R组件各测试数据之间的关联规则,构建了T/R组件的综合状态量和单项状态量集;针对常权重系数不能准确反映T/R组件真实工作状态的问题,引入均衡函数,并计算出了各综合状态量的变权重系数,建立了一种较为准确、客观的大型相控阵雷达T/R组件状态评估方法;根据相控阵雷达的参数指标确定了T/R组件的维修阈值,最终对机内自检检测的故障T/R组件进行状态评估,并对评分低于60分的T/R组件进行换件维修。实例计算结果表明,该评估方法和维修策略具有较高的可行性,能够充分发挥T/R组件的剩余寿命价值,对提高装备的保障效能具有重要意义。     

基于免疫算法的装备维修人员调配方法

为提高维修人员维修工作安排合理性、时效性与人员作业量的均衡性,提出一种基于免疫算法的装备维 修人员调配方法。对装备大修过程中维修人员调配问题进行分析,利用矩阵寻址和均衡度评判,采用改进免疫算法 抗体的生成方式和评价标准,构建装备维修人员的调配优化方法,利用Matlab 编程计算调配结果,并通过Flexsim 软件仿真进行验证。仿真结果表明,该方法对装备维修效率的提高和人员作业量的均衡分配具有较好效果。