西门子全集成自动化理念初探

系统阐述了全集成自动化理念的内涵，指出其特点在于统一的数据管理、统一的编程组态、统一的通讯以及无与伦比的开放性，其中采用WINCC与STEP7两个软件进行了说明，井提出全集成自动化应用将是今后自动化技术发展应用的方向。     

Solving the small sample size problem in face recognition using generalized discriminant analysis

The goal of face recognition is to distinguish persons via their facial images. Each person's images form a cluster, and a new image is recognized by assigning it to the correct cluster. Since the images are very high-dimensional, it is necessary to reduce their dimension. Linear discriminant analysis (LDA) has been shown to be effective at dimension reduction while preserving the cluster structure of the data. It is classically defined as an optimization problem involving covariance matrices that represent the scatter within and between clusters. The requirement that one of these matrices be nonsingular restricts its application to datasets in which the dimension of the data does not exceed the sample size. For face recognition, however, the dimension typically exceeds the number of images in the database, resulting in what is referred to as the small sample size problem. Recently, the applicability of LDA has been extended by using the generalized singular value decomposition (GSVD) to circumvent the nonsingularity requirement, thus making LDA directly applicable to face recognition data. Our experiments confirm that LDA/GSVD solves the small sample size problem very effectively as compared with other current methods.     

Optimal and self‐tuning fusion Kalman filters for discrete‐time stochastic singular systems

Based on the optimal fusion estimation algorithm weighted by scalars in the linear minimum variance sense, a distributed optimal fusion Kalman filter weighted by scalars is presented for discrete‐time stochastic singular systems with multiple sensors and correlated noises. A cross‐covariance matrix of filtering errors between any two sensors is derived. When the noise statistical information is unknown, a distributed identification approach is presented based on correlation functions and the weighted average method. Further, a distributed self‐tuning fusion filter is given, which includes two stage fusions where the first‐stage fusion is used to identify the noise covariance and the second‐stage fusion is used to obtain the fusion state filter. A simulation verifies the effectiveness of the proposed algorithm. Copyright © 2008 John Wiley & Sons, Ltd.     

防治水泥稳定碎石基层沥青路面裂缝的措施浅析

水泥稳定碎石基层沥青路面裂缝产生的原因复杂 ,但非荷载型裂缝更为主要。防治水泥稳定碎石基层沥青路面的裂缝应该从设计和施工两方面考虑 ,其中由结构、材料组成设计 ,以及施工工艺出发控制水泥稳定碎石基层本身的收缩也是一项重要措施。     

MPEG-2视频编码标准及CLM4400视频编码芯片简介

本文通过MPEG-2和MPEG-1在视频方面的比较，简略地介绍了MPEG-2视频标准，并附带介绍了C-CUBE公司的MPEG-2视频编码芯片CLM4400的功能和应用前景。     

FIDIC合同条件下的索赔

从FIDIC合同条件来讲,索赔是合同双方均等的权利,既可以是承包商向业主索赔,也可以是业主向承包商索赔。实际工作中,由于业主向承包商索赔的频率大大低于承包商向业主索赔的频率,习惯上业主总是着     

夏热冬暖地区住宅平面设计与空调能耗关系分析

夏季住宅空调能耗已成为目前广州地区电力过荷的一个主要原因，而目前建筑师对住宅设计中的空调能耗因素并未有深入的考虑。本文就广州地区中高层住宅标准层平面设计中的朝向、形状、大小及层高与空调能耗关系进行了相关的分析，适用于夏热冬暖地区。     

高效铣环在胜科1井事故处理中的应用

胜科1井是中国石化的一口重点科学探井,在钻至井深5001m时因井眼缩径发生了卡钻事故。由于井底存在直翼扩大器、PDC钻头等含有硬质合金的落鱼,普通铣鞋无法完成套铣打捞作业,为此,专门设计了一种高效铣环。该铣环的切削元件选用了一种硬度达93.2 HRA的钛合金,经铣槽镶焊在本体上;本体选用了40CrNiMo厚壁管材,并进行了调质处理;连接螺纹选用了双级梯形同步螺纹。在胜科1井的应用表明：切削元件的强度满足了切削扩大器切削翼和PDC钻头胎体的需要,其齿形、布齿方向和出刃高度设计合理,提高了切削速度;本体性能高,切削元件焊接性能较好;双级梯形同步螺纹有效增加了连接部位的强度,具有较高的上扣扭矩,承受冲击载荷能力强。高效铣环在该井的成功应用,为今后同类型井的事故处理提供了借鉴。     

大变量逻辑函数最佳覆盖问题研究

逻辑函数的最佳覆盖，一直是逻辑综合领域的关键环节。尤其是大变量逻辑函数最佳覆盖，对复杂的逻辑综合更为重要，但也更加困难。本文在对逻辑覆盖算法研究的基础上，提出了适合大变量逻辑函数最佳覆盖的Beister改进算法。经过大量算题的测试表明，改进的列覆盖算法在时间复杂度和选择效果方面均优于Beister算法。     

十年风雨十年情

十年，在人类历史的长河中只是短短的一瞬，而对于普通人的一生来说，十年却意味着青春的大半光阴。从20世纪的1995年到今天，十年如一日。他一步一个脚印，把美好的青春奉献给了日新月异的数据通信事业。他叫汤昕，现任乐清电信局数据维护支撑室主任。