基于WEB XML的XPATH查询新方法

XML与数据库的通信问题是XML研究领域中的一个重要问题。本文在总结多种映射方法的基础上，提出了一种方法将多个相似的XML文档进行解析，根据映射关系，生成统—模式，并分析归纳出一个集成的模式，然后创建一个数据库，提取XML文档数据。它主要解决了XML文档与数据库通信问题并通过实例论述了实现步骤及相关的关键技术，在实际项甚中充分发挥了数据库数据存储的优势和XML文件传输的高效性，其最大的特点就是不用考虑文档的模式信息（DTD，XML Schema）。     

基于面向对象XML文档存储策略的研究

随着Internet的快速发展,XML正在成为Internet上数据描述和交换的标准。通过对面向对象的XML文档的存储模式的研究,实现了面向对象XML文档的存储。该存储策略可以保存面向对象XML文档所具有的面向对象特征信息,以支持元素层次、重载、继承中止、多重继承和冲突处理机制。     

基于WEB XML到关系数据库的转换新方法

XML在关系数据库中的存储问题是XML研究领域中的一个重要问题.在总结多种映射方法的基础上,提出了一种新方法将多个相似的XML文档进行解析,根据映射关系,生成各自的关系模式,并分析归纳出一个集成的关系模式,然后创建一个关系数据库,并在映射关系的基础上提取并存储XML文档数据到关系数据库。此方法以较为简洁的结构保存了XML文档的数据信息,其最大的特点就是不用考虑文档的模式信息（DTD,XML Schema）。并通过一个具体的实验结果来说明这种方法的有效性。     

基于Oracle XML DB技术的XML数据存储研究

如何对XML文档进行有效管理与快速查询是当前学术界的研究热点,即所谓的XML数据库。对当前XML数据库的研究现状与发展趋势进行全面的论述与分析,以Oracle 10g数据库为例,简要介绍了Oracle XML DB技术,并以实例说明如何利用这种技术将XML和关系数据库联系起来,实现对XML文档的有效存储。     

论XML文档的索引结构设计

XML文档的置标语义信息舜口结构化特点，使检索更易于实现，且能改善检索时的查准率。本文利用二叉排序树为XML文档建立索引文件，给出了建立索引的数据结构舜口算法，并分析了二叉排序树索引在改善XML文档的数据更新，检索速度及查准率等方面的优势。     

数据映射技术在油田钻井资料汇交系统中的应用

企业原有的独立的系统软件和操作方式,在局部系统与中心系统之间形成了数据的异构性,数据映射技术能够很好的解决异构数据之间的转换,利用中间产生的XML文档作为交换标准,使用XML标记语言对不同的异构数据进行了统一的定制和描述,形成统一的XML映射文档,对已定制XML文档的提取,不同结构的数据描述成统一格式,最终达到从源数据库向目标数据库迁移的目的。     

XML文档与关系数据库数据映射互换研究

简要介绍了XML文档和关系数据库进行数据交换的必要性,并讨论了XML文档数据库和关系数据库之间进行数据相互转换的算法,并对计算机上机操作的实验流程进行了简要的描述。     

两种支持XML结构化连接算法的比较

XML文档的结构化连接问题是XML文档查询中的核心问题。XML文档的查询包括两类查询，一类是值的查询，一类是结构的查询。本文通过比较两种基于B 树和XR树的索引技术的XML文档结构化连接算法，说明基于XR树索引的结构化连接算法优于基于B 树索引的结构化连接算法。     

WWW中的XML数据管理研究

WWW中XML文档日益增多，为了实现Web上有效信息服务与信息管理，需要加强WWW中XML文档管理的研究。本文从XML的数据组织、XML的存贮、检索、显示四个方面探讨了如何对XML数据进行管理。     

对关系数据库与XML数据库的比较研究

作为当今比较流行的二大数据库,本文主要分析了XML数据库与关系数据库之间的关系,结合实例论述了XML文档的特点,并对XML文档内容到关系数据库的转换提出了一种可行的解决思路。     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.     

Prevalence of soft neurological signs in Chinese people

Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence     

Chinese Scientists Use Earth Observation Technologies to Study and Protect Wild Camels

<正>Chinese scientists plan to apply Earth Observation technologies to protect the critically endangered wild camels(Camelus ferus).With the help of remote sensing,satellite positioning,geographical information system and wireless sensors networks,they will be able to access the distribution and population of the wild camels and protect their habitats.The project will be carried out by the International Research Center for Wild Camel Conservation,which was jointly established earlier this year by the Institute of Remote Sensing and Digital Earth(RADI)of the Chinese     

More than Skin Deep – Understand Skin Biology by Means of Dermatogenomics

<正>The Paul Gerson Unna Research Group on Dermatogenomics was founded in October 2012 at the Partner Institute for Computational Biology.The ultimate goal of the group is to understand the biology of skin and skin appendages.