静叶片钢冷轧变形的研究

本文对１Ｃｒ１１ＭｏＶ静叶片钢进行了冷轧变形的研究。确定了宽展面积与压缩面积的关系，各道次的宽展面积与压缩面积比值，宽展与压下量的关系，以及压下量沿轧件宽向的分布。为选择坯料外形和尺寸，孔型设计以及制定压下制度提供依据。     

回火温度对0．2C－14Co－12Ni－3Cr－1Mo钢组织与性能的影响

在４３０℃回火，板条间存在的渗碳体使０．２Ｃ－１４Ｃｏ－１２Ｎｉ－３Ｃｒ－１Ｍｏ钢的冲击韧性和断裂韧性出现最低值。４５０℃回火导致了硬化峰（σ＿ｂ≈２１０５ＭＰａ），主要是细小共格析出的碳化物所致。最佳的性能配合为拉森－米勒参数（ＬＭＰ）等于２８０００～２８３００时的回火温度。对应的回火温度为４８２℃。     

应用GMM的快速火焰检测

基于视频图像的火焰检测是火灾预防研究的重要内容。为提高检测效率,首先使用具有自适应背景变化的 高斯混合模型(GMM)来检测场景中的运动物体。然后针对运动物体,提取颜色特征和面积变化特征。最后,根据得 到的特征来识别场景中是否有火焰发生。该方法不仅可有效检测到视频中的火焰帧,还避免了非火焰场景中对计算时 间的浪费。     

Mean waiting time evaluation of packet switches for centrally controlled PBX''s

The performance analysis of packet switched networks usually does not account for the loss of transmission bandwidth caused by the switch processing time. In wide area networks, where transmission channels are of the order of 64 kbps or less, this is a valid approach since switch processing time is negligible compared to average transmission times for packets. However, in Local Area Networks (LANs), the transmission channels are usually of the order of 1 mbps or greater and thus when evaluating the performance of a LAN that is based on a packet switch, it is necessary to consider the effect of the switch processing time which is now comparable to that of the average packet's transmission time. This paper investigates the effect of this processing time on network performance, and an exhaustive cyclic queueing algorithm to minimise this effect on overall network performance is discussed. An approximate analytical technique for evaluating the performance of such a LAN is derived. This technique makes it possible to do interactive calculations which can be used in the provisioning and configuring of such networks.     

一种索引系统架构的优化策略研究

在局部索引架构下,应用搜索引擎优化算法会对索引系统的性能带来负面的影响。目前主要有两种索引架构：全局索引和局部索引,本文针对它们各自的优缺点,应用搜索引擎优化策略,提出综合使用两种索引架构：索引系统整体上采用局部索引架构,并对高频关键词对的postinglist交集采用全局索引架构的方式,可以很好的解决这个问题。     

车载CAN网络中直接NM逻辑环的实现

为实时监控车载网络中的节点,在使用控制器区域网络(CAN)总线的车载网络中,设计并实现一种基于OSEK/VDX规范直接网络管理(NM)的车载NM系统。由车载网关通过CAN总线收集各网络节点的故障信息,通过IPv6无线网络上传至远程故障诊断服务器,并将得到的故障处理信息下发至有关节点,实现车载CAN网络与远程故障诊断服务器的信息交互。测试结果表明,各网络节点上线后能快速建立稳定的逻辑环通信,并为远程故障诊断提供操作平台。     

2号高炉高冶强下的指标优化措施

在高冶强的生产状态下,高炉如何优化各项技术经济指标,降低其成本,从而提高产品竞争力,是现代高炉操作者积极探索的问题。梅钢2号高炉通过精料、优化操作、改进工艺措施等的实施,实现了高炉高冶强下的指标优化。     

Using multiple indexes for efficient subsequence matching in time-series databases

A time-series database is a set of data sequences, each of which is a list of changing values of an object in a given period of time. Subsequence matching is an operation that searches for such data subsequences whose changing patterns are similar to a query sequence in a time-series database. This paper addresses a performance issue of time-series subsequence matching. First, we quantitatively examine the performance degradation caused by the window size effect, and then show that the performance of subsequence matching with a single index is not satisfactory in real applications. We claim that index interpolation is a fairly effective tool to solve this problem. Index interpolation performs subsequence matching by selecting the most appropriate one from multiple indexes built on windows of their distinct sizes. For index interpolation, we need to decide the sizes of windows for multiple indexes to be built. In this paper, we solve the problem of selecting optimal window sizes from the perspective of physical database design. Given a set of pairs 〈length, frequency〉 of query sequences to be performed in a target application and a set of window sizes for building multiple indexes, we devise a formula that estimates the overall cost of all the subsequence matchings performed in a target application. By using this formula, we propose an algorithm that determines the optimal window sizes for maximizing the performance of entire subsequence matchings. We formally prove the optimality as well as the effectiveness of the algorithm. Finally, we show the superiority of our approach by performing extensive experiments with a real-life stock data set and a large volume of synthetic data sets.     

Coverage and connectivity issues in wireless sensor networks: A survey

Sensing coverage and network connectivity are two of the most fundamental problems in wireless sensor networks. Finding an optimal node deployment strategy that would minimize cost, reduce computation and communication overhead, be resilient to node failures, and provide a high degree of coverage with network connectivity is extremely challenging. Coverage and connectivity together can be treated as a measure of quality of service in a sensor network; it tells us how well each point in the region is covered and how accurate is the information gathered by the nodes. Therefore, maximizing coverage as well as maintaining network connectivity using the resource constrained nodes is a non-trivial problem. In this survey article, we present and compare several state-of-the-art algorithms and techniques that aim to address this coverage–connectivity issue.     

企业绩效管理在CIMS系统设计中的研究与应用

信息化是企业提升和保持竞争力的重要手段，但怎样才能与企业的各种价值活动真正地结合起来，为企业的生产和管理带来效益，这是所有企业一直非常关心的问题。针对石化炼化企业的生产、管理工作中的各种价值活动，引入企业绩效管理系统，使企业管理变革与CIMS系统相结合，探索企业战略信息系统建设的新途径和新方法，达到增强企业竞争力，促进企业赢利的目的。