网络门户网站登录技术研究

对Web服务中的个性化门户技术进行应用研究，重点讨论其中安全登录机制，研究了应用环境中所使用的单次登录技术，最终把登录技术与LDAP目录服务技术相结合使用，实现应用服务的安全管理。     

大数据量遥感影像的分条带镶嵌策略

在个人计算机条件下,海量遥感图像的镶嵌是一个难题。该文从计算机软件和硬件等多个方面,对问题进行深入分析,提出分条带镶嵌的策略,解决了海量遥感图像镶嵌难题。设计并实现软件系统,该软件在遥感图像处理工作中已得到运用,实践表明本文提出的海量遥感影像镶嵌策略能够在PC条件下,较好地完成海量影像快速显示和图像镶嵌。     

数字图像拼接方法研究进展

数字图像拼接是指将具有重叠区的多幅数字图像或多帧视频通过配准和融合获得单幅宽视场图像或者动态全景图.数字图像拼接方法主要包括图像配准算法和图像融合算法.根据待拼接图像和拼接图像的特点,介绍图像拼接的4种基本类型,说明图像拼接的研究意义,概述近年来图像拼接方法的研究状况,最后分析图像拼接方法的研究动向.     

Web表单数据加密和签名组件的设计与实现

在Web应用中，数据的交换主要通过Web页面中的FORM表单来实现。为了确保数据的安全，有必要在浏览器中对Web页面里的FORM表单数据进行加密和签名，在服务器端对数据解密和验证。为此笔者设计了一个对FORM数据进行加密和签名，解密和验证的组件，实现了对FORM数据的加解密、身份验证和数据完整性验证等功能。其优点是应用方便，甚少占用服务器资源。     

基于RSA算法的数字签名技术在电子商务中的应用

介绍数字签名在电子商务中的重要作用,探讨RSA算法的可行性和在数字签名中的应用,对RSA算法的安全性进行分析。     

Generation of sign Walsh spectra from disjoint cubes of Boolean functions

A new algorithm is given that converts a reduced representation of Boolean functions in the form of disjoint cubes to sign Walsh spectra. Since the known algorithms that generate sign Walsh spectra always start from the truth table of Boolean functions, the method presented computes faster with a smaller computer memory. The method is especially efficient for such Boolean functions that are described by only few disjoint cubes.     

Ursula Bellugi and Edward S. Klima.

Ursula Bellugi and Edward S. Klima are cited for their contributions to the neuropsychology of language. They have pursued over many years a program of rigorous behavioral research, guided by a commitment to the key theoretical issues of their field. Their systematic research into the normal structure and function of American Sign Language (ASL); their groundbreaking studies of ASL aphasia; and their ambitious, cross-disciplinary program of research into Williams syndrome will help determine how language relates, psychologically and neurologically, to general cognitive function. A biography and selected bibliography are provided for both Bellugi and Klima, as well as a discussion of the research they have conducted jointly. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于图像拼接的微表面三维测试系统开发

常用的干涉系统可测量较大区域但达不到足够的分辨率,干涉显微镜的测量可达较高的分辨率,但测量区域小.本文提出了一种将干涉显微技术和图像拼接结合的微表面三维测试系统.系统将Mirau显微干涉物镜与压电陶瓷传感器(PZT)结合起来实现相移干涉,从而获取被测件形貌的信息.同时采用精确定位电控平移系统精确定位,实现被测件表面的分区域扫描,并利用子区域图像的重叠区域进行拼接匹配.考虑不同重叠尺度对拼接效率以及拼接质量影响,设定不同比例的重叠区域进行对比实验.实验结果表明重叠区域在20%左右综合效果最好.     

A high-accuracy approximate adder with correct sign calculation

Conventional precise adders take long delay and large power consumption to obtain accurate results. Exploiting the error tolerance of some applications such as multimedia, image processing, and machine learning, a number of recent works proposed to design approximate adders that generate inaccurate results occasionally in exchange for reduction in delay and power consumption. However, most of the existing approximate adders have a large relative error. Besides, when applied to 2's complement signed addition, they sometimes generate a wrong sign bit. In this paper, we propose a novel approximate adder that exploits the generate signals for carry speculation. Furthermore, we introduce a low-overhead module to reduce the relative error and a sign correction module to fix the sign error. Compared to the conventional ripple carry adder and carry-lookahead adder, our adder with block size of 4 reduces power-delay product by 66% and 32%, respectively, for a 32-bit addition. Compared to the existing approximate adders, our adder significantly reduces the maximal relative error and ensures correct sign calculation with comparable area, delay, and power consumption. We further tested the performance of our adders with and without the sign error correction module in three real applications, mean filter, edge detection, and k-means clustering. The experimental results demonstrated the importance of reducing the relative error and ensuring the correct sign calculation for 2's complement signed additions. The outputs produced using our adder with the sign error correction module are very close to those produced using accurate adder.     

AutoCAD动态块在工程图样标注中的应用

应用AutoCAD2006动态块功能,创建了参数化动态块基准代号、粗糙度符号以及零部件序号;介绍了创建动态块以及保存和利用工具选项板管理动态块的具体方法;探讨了动态块的使用,并利用动作夹点对这3种动态块进行了模拟标注,实际操作表明参数化动态块的使用可以简化操作、提高绘图速度.