基于LDAP的WEB信息系统设计与研究

文章在讨论轻量级目录访问协议LDAP和JAVA技术的基础上，基于B／S模式，设计并实现了一个企业Web信息系统。该系统采用LDAP服务器存放信息，使得LDAP客户程序能快速地访问服务器上的各种信息资源，具有较好的可移植性、可扩充性和安全性。     

我国教育网站易访问性的现状及其设计

教育网站是网络教育的应用平台,教育网站的易访问性是不同学习者获取信息和达到同一学习目标的必要条件。本文介绍了教育网站易访问性和各类有特殊访问需求的学习者的关系,分析了我国教育网站易访问性的现状和主要问题,并探讨了如何改进教育网站易访问性的设计。     

中国人民大学书报资料中心《中小学各科教与学》全新改版

2001年4月，我随美国教育代表团访问中国。这次访问非常愉快。访问过程中，我对美中教育进行了比较。无论是学生与教师的比率、教育培训，还是校长选拔，美中两国都面临着许多挑战，我们都在为提高所有学生的教学质量而做着探索。我认为，美中教育在教育政策、教育实践、教育目标等方面，相同点大于不同点．美中教育的相同表现的三个方面：     

谈化学教学中的科学探究

科学探究既是新课改理念实施中的一种全新的学习方法,也是新课改下化学学习的重要内容,要求学生通过科学探究活动来掌握科学知识,接受科学过程和科学方法的训练,并在二者的相互作用中理解化学、理解科学,从而提高自身的科学素养。笔者结合新课改理念,谈谈化学教学中的科学探究。     

FARMER: A novel approach to file access correlation mining and evaluation reference model

File semantic has proven effective in optimizing large scale distributed file system. As a consequence of the elaborate and rich I/O interfaces between upper layer applications and file systems, file system can provide useful and insightful information about semantic. Hence, file semantic mining has become an increasingly important practice in both engineering and research community. Unfortunately, it is a challenge to exploit file semantic knowledge because a variety of factors could affect this information exploration process. Even worse, the challenges are exacerbated due to the intricate interdependency between these factors, and make it difficult to fully exploit the potentially important correlation among various semantic knowledges. This article proposes a file access correlation miming and evaluation reference (FARMER) model, where file is treated as a multivariate vector space, and each item within the vector corresponds a separate factor of the given file. The selection of factor depends on the application, examples of factors are file path, creator and executing program. If one particular factor occurs in both files, its value is non-zero. It is clear that the extent of inter-file relationships can be measured based on the likeness of their factor values in the semantic vectors. Benefit from this model, FARMER represents files as structured vectors of identifiers, and basic vector operations can be leveraged to quantify file correlation between two file vectors. FARMER model leverages linear regression model to estimate the strength of the relationship between file correlation and a set of influencing factors so that the “bad knowledge” can be filtered out. To demonstrate the ability of new FARMER model, FARMER is incorporated into a real large-scale object-based storage system as a case study to dynamically infer file correlations. In addition FARMER-enabled optimize service for metadata prefetching algorithm and object data layout algorithm is implemented. Experimental results show that is FARMER-enabled prefetching algorithm is shown to reduce the metadata operations latency by approximately 30%–40% when compared to a state-of-the-art metadata prefetching algorithm and a commonly used replacement policy.     

Area-time associated test cost model for SoC and lower bound of test time

A novel test access mechanism (TAM) architecture with multi test-channel (TC) based on IEEE Standard 1500 is proposed instead of the traditional sub-TAM structure. The cost model of an area-time associated test and the corresponding lower bound of system-on-chip (SoC) test time are established based on this TAM architecture. The model provides a more reliable method to control the SoC scheduling and reduces the complexity in related algorithm research. The result based on the area time associated test cost model has been validated using the ITC’02 test benchmark.     

汉语言远端教育文化圈:一个值得注意的远端教育文化构想

“汉语言远端教育文化圈”概念是一个基于“文化圈”理论的现实构想，其目的是利用现代信息技术和教育技术，使全球范围内每一个运用汉语言媒介进行远程学习的人，都能满足其接受高等教育的梦想。本文基于对“汉语言远端教育文化圈”两大结构层次：以汉语为母语的“华裔社会人群远端教育文化圈”和以汉语作为文化交流语言或对汉语有着深厚思想感情的非华裔人群的“非华裔社会人群远端教育文化圈”的文化背景，结构及其思想体系的剖析，对于“汉语言远端教育文化圈”内外的多种远端教育圈合作，尤其是远端教学资源建设的开发与共享合作，提出了极具建设性的构想和意见。     

基于VB 6.0的数据库访问技术对比分析

对几种基于VB 6.0中数据库访问的技术进行对比,分析说明了各种访问技术的特点,介绍了它们访问数据库的方法。     

恐龙多米访问多巴星

恐龙多米一直盼着到多巴星去，多巴星是他遥远的故土。几千万年前，一颗小行星砸到了多米的老家多巴星球，并引起了惊天动地的大爆炸。滚滚的烟尘罩住了整个星球。