多光谱扫描仪遥感测量海冰图象中亮度与厚度关系研究

本文利用海冰分类图象,以海冰厚度、波长和反射率之间建立的模型为理论基础,通过对海冰样区大量统计运算及各种回归结果的比较,导出了多光谱扫描仪3、4、5、6四个波段海冰亮度灰级与海冰厚度的关系式,利用这一关系式算出的海冰样区的冰厚分布数值图具有直观、定量的特点。     

水中碱度组成的分析

本文从理论和实践的结合上概述了工农业生产和科学研究中,水中常见的几种碱度的组成、分类和分析方法,并对水中几种碱度的组成与测定结果的关系进行了综合分析.     

互联电力系统潮流计算的电压叠加方法

本文提出一种基于分解一协调原理的互联电力系统潮流计算的电压叠加方法,它是按地理位置或运行区域自然分块的,可以实现按计划的子系统过剩功率、子系统间交换功率以及联络线功率控制的运行方式。本方法具有内存省、计算速度快和收敛性好的特点,是一种有效的实用方法。文中附有实际互联系统的143节点算例。     

Privacy preservation for data cubes

A range query finds the aggregated values over all selected cells of an online analytical processing (OLAP) data cube where the selection is specified by the ranges of contiguous values for each dimension. An important issue in reality is how to preserve the confidential information in individual data cells while still providing an accurate estimation of the original aggregated values for range queries. In this paper, we propose an effective solution, called the zero-sum method, to this problem. We derive theoretical formulas to analyse the performance of our method. Empirical experiments are also carried out by using analytical processing benchmark (APB) dataset from the OLAP Council. Various parameters, such as the privacy factor and the accuracy factor, have been considered and tested in the experiments. Finally, our experimental results show that there is a trade-off between privacy preservation and range query accuracy, and the zero-sum method has fulfilled three design goals: security, accuracy, and accessibility. Sam Y. Sung is an Associate Professor in the Department of Computer Science, School of Computing, National University of Singapore. He received a B.Sc. from the National Taiwan University in 1973, the M.Sc. and Ph.D. in computer science from the University of Minnesota in 1977 and 1983, respectively. He was with the University of Oklahoma and University of Memphis in the United States before joining the National University of Singapore. His research interests include information retrieval, data mining, pictorial databases and mobile computing. He has published more than 80 papers in various conferences and journals, including IEEE Transaction on Software Engineering, IEEE Transaction on Knowledge & Data Engineering, etc. Yao Liu received the B.E. degree in computer science and technology from Peking University in 1996 and the MS. degree from the Software Institute of the Chinese Science Academy in 1999. Currently, she is a Ph.D. candidate in the Department of Computer Science at the National University of Singapore. Her research interests include data warehousing, database security, data mining and high-speed networking. Hui Xiong received the B.E. degree in Automation from the University of Science and Technology of China, Hefei, China, in 1995, the M.S. degree in Computer Science from the National University of Singapore, Singapore, in 2000, and the Ph.D. degree in Computer Science from the University of Minnesota, Minneapolis, MN, USA, in 2005. He is currently an Assistant Professor of Computer Information Systems in the Management Science & Information Systems Department at Rutgers University, NJ, USA. His research interests include data mining, databases, and statistical computing with applications in bioinformatics, database security, and self-managing systems. He is a member of the IEEE Computer Society and the ACM. Peter A. Ng is currently the Chairperson and Professor of Computer Science at the University of Texas—Pan American. He received his Ph.D. from the University of Texas–Austin in 1974. Previously, he had served as the Vice President at the Fudan International Institute for Information Science and Technology, Shanghai, China, from 1999 to 2002, and the Executive Director for the Global e-Learning Project at the University of Nebraska at Omaha, 2000–2003. He was appointed as an Advisory Professor of Computer Science at Fudan University, Shanghai, China in 1999. His recent research focuses on document and information-based processing, retrieval and management. He has published many journal and conference articles in this area. He had served as the Editor-in-Chief for the Journal on Systems Integration (1991–2001) and as Advisory Editor for the Data and Knowledge Engineering Journal since 1989.     

基于虚拟仪器的铁轨损伤检测系统

本文介绍了铁质材料因裂纹或损伤而产生缺陷的定量检测原理。设计了基于虚拟仪器的铁轨损伤检测系统。详细介绍并分析了LabVIEW开发平台在数据采集和数据分析上的实现方法．实现了一台PC同时对多条铁轨进行损伤检测。并论证该方法的可行性与可靠性，得出了相关的结论。     

基于ARM的嵌入式一体化工业控制机硬件系统设计

介绍一种基于Atmel公司AT91M40800芯片的嵌入式一体化工业控制机硬件系统的设计。该系统提供了32位高速数据处理能力,并配有CPLD、LCD、PS/2键盘、CF卡、USB及串行接口等多项功能,并留有16路输入/输出扩展口,体积小巧,便于携带,操作方便,可通用于许多工业控制领域,特别是需要用步进电机控制二维和准三维运动控制的场合。     

基于CAN／LIN总线的汽车通信网络设计

随着人们对汽车各方面要求的不断提高，汽车上的电控系统数量越来越多，随之产生诸如电路复杂性增加、可靠性下降、生产成本增加等问题。为解决上述问题文中提出了一种基于CAN总线和LIN总线技术的现代汽车通信网络的低成本设计方案。设计中将CAN总线技术用于高速的驱动系统中，将LIN总线技术（其节点成本是CAN的1／3～1／2）用于低速的车身系统中，在器件选型上采用了PHILIPS和FREESCALE的典型汽车电子芯片，既实现了应有的网络控制功能，同时也降低了车辆电子系统的开发、生产和服务成本，具有较高的实用性。     

多线程同步机制在应用程序与驱动程序通信中的应用

本文对Windows NT操作系统的多线程同步机制和同步对象进行了分析,以其在检测仪和经纬仪同步通信程序开发中的应用为例,论述了如何通过共享事件来实现应用程序和设备驱动程序的同步通信,并给出了同步驱动程序的实现原理和具体编写步骤.     

全球互联网最新发展状况和趋势分析

截至2005年3月，全球互联网用户达8．9亿，普及率13．9％，在过去的5年增长146％，处于快速发展时期。各地区互联网用户数、普及率（互联网用户数占总人口的比例）及所占比例情况如表1所示。     

具有自动标定功能的发酵罐多点温度采集系统

为系统地研究发酵罐内的温度分布,开发啤酒、制药等行业所需的端面测温传感器,本文利用自制的测量多点温度的传感器,采用热电阻自动标定、曲线分段拟合非线性校正和热电阻矩阵网络等多种处理方法及微功耗的单片机技术,设计了一种新型的计算机多点温度采集系统。温度测量精度达0.1℃,完全满足系统精度要求。