Realizing the potential of empowerment: the impact of a feedback intervention on the performance of complex technology

An empowerment initiative involving enhanced fault-management responsibility for operators of complex technology had not led to expected increases in performance, and investigations suggested that this was due to a lack of appropriate feedback. Thus, a feedback intervention was designed to provide specific, timely feedback on operator-correctable faults. It was hypothesized that the intervention would increase operator self-reliance in operating complex technology and promote system performance. Moreover, given the feedback was continuous from the point of intervention, it was predicted that gains would increase over time. Time series analysis of data on engineer call-outs (self-reliance) and machine utilization (performance) showed clear positive effects of the feedback intervention, with call-outs also showing progressive improvement. Selfreport data showed no change over time in motivation, but an increase in knowledge dissemination and a reduction in the likelihood of making expensive mistakes. There were no detrimental effects on operator well being. Implications for theory and practice in the management of complex technology are discussed.     

华东电网CPS考核标准运行分析

介绍了华东电网目前频率质量控制的现状和考核标准,结合实际运行数据分析了现行考核标准CPS在实际运行中所表现出的约束效力和其有待改进之处,由分析结果提出了对考核标准的改进方法和今后电网的频率质量控制手段.     

自组织网中的动态路由算法性能仿真研究

以仿真为主要手段研究了自组织网中基于AODV的路由算法的性能 ,比较了采用全网泛洪方式和限制泛洪半径方式下的网络性能。改进了现有调度策略 ,并仿真了其对端到端时延的影响。仿真结果表明 ,采用限制泛洪半径方式的网络性能明显好于全网泛洪方式 ,而改进型调度策略也能够进一步有效提高网络性能     

On the effects of the packet size distribution on the packet loss process

Real-time multimedia applications have to use forward error correction (FEC) anderror concealment techniques to cope with losses in today’s best-effort Internet. The efficiency of these solutions is known however to depend on the correlation between losses in the media stream. In this paper we investigate how the packet size distribution affects the packet loss process, that is, the distribution of the number of lost packets in a block, the related FEC performance and the average loss run length. We present mathematical models for the loss process of the MMPP+M/D/1/K and the MMPP+M/M/1/K queues; we validate the models via simulations, and compare the results to simulation results with an MPEG-4 coded video trace. We conclude that the deterministic packet size distribution (PSD) not only results in lower stationary loss probability than the exponential one, but also gives a less correlated loss process, both at a particular average link load and at a particular stationary loss probability as seen by the media stream.Our results show that for applications that can only measure the packet loss probability, the effects of the PSD on FEC performance are higher in access networks, where a single multimedia stream might affect the multiplexing behavior. Our results show that the effects of the PSD on FEC performance are higher in access networks, where a single multimedia stream might affect the multiplexing behavior and thus can improve the queuing performance by decreasing the variance of its PSD.     

SQL Server透明数据加密方法分析

本文介绍了透明数据加密方法的理论知识和实现方法,分析了该加密方法的缺点和限制,并为方法的使用给出了一些建议.     

Power-conserving routing of ad hoc mobile wireless networks based on entropy-constrained algorithms

This paper presents an approach to power-conserving routing of ad hoc mobile wireless networks. This approach relies on entropy-constrained routing algorithms, which were developed by utilizing the information-theoretic concept of the entropy to gradually reduce the uncertainty associated with route discovery through a deterministic annealing process. Entropy-constrained routing algorithms were tested using a single performance metric related to the distance between the nodes and to the power consumption associated with packet transmission. This paper also expands the versatility of entropy-constrained routing algorithms by making them capable of discovering routes based on multiple performance metrics. In this study, the second performance metric employed for route discovery relied on the power availability in the nodes of the network. The proposed routing approach was evaluated in terms of the power consumption associated with the routing of packets over an ad hoc mobile network in a variety of operating conditions.     

分布式紧耦合虚拟专用网可靠性计算方法

为了评估构建在互联网络基础上,具有多个服务质量约束要求的分布式紧耦合虚拟专用网可靠性能,该文提出一套可靠性指标计算方法。首先,在赋有权值参数的互联网络中,计算出所有满足约束条件的分布式紧耦合节点之间路由。然后,根据这些路由建立满足服务质量要求的网络邻接矩阵,对邻接矩阵进行分解与整合等变换,求得满足约束条件的不交化网络状态集。最后,根据不交化网络状态集得到可靠性指标的计算式,进而完成可靠性指标计算。由于所有过程都实现了代数化或逻辑代数化计算,所以易于计算机编程实现。论述了算法关键环节的正确性。通过算例、实验以及与传统算法结果比较等方式,说明新算法能够非常贴切地反映出分布式紧耦合虚拟专用网的可靠性。     

用扫屏放气性能表征彩显管真空质量的测试方法及其应用研究

简介了测试扫屏放气性能的原理、装置、方法、数据处理过程与误差分析.应用研究表明,寿命初期(25 h内)的扫屏放气性能就能表征彩显管的真空质量,用它可判断或比较制屏工艺与材料(包括排气工艺与设备)的优劣,预估因真空因素导致失效的整管寿命水平.这种快速信息反馈方法,比"加速寿试"更能及时地反映工艺或材料变更对成品管带来的影响.     

管内材料高温放气性能的测试及应用研究

管内材料放气性能的优劣直接影响着整管的性能和寿命.本文简介了测试管内材料高温放气性能的原理、装置和方法.文中列举的几项应用实例表明,本项测试结果对产品质量控制、工艺技术改进和材料进厂检验及国产化攻关都具有指导意义.     

建立统计宏模型的新方法

本文介绍一个新的建立统计宏模型的系统，它采用新的方法，得到简化的二次多项式，这种形式便于优化处理，适用于容差设计。