浅谈吊顶工程施工的技术要求和方法

从吊顶工程的构造，分类上对其施工工艺的技术要求进行讨论分析。     

搜索引擎搜索结果中文网页分类系统

论文设计实现中文搜索网页分类系统，包括：关键字搜索结果网页类型判断方法，网页主题内容提取。对于不容易分类的网页，采用基于摘要的网页搜索结果聚类和基于学习的网页搜索结果分类器设计方法。最后，构造中文文本分类器，并编程实现，通过实例测试分类器性能。     

分支分类的一种计算方法——最大同步法

 本文讨论数量分支分类，提出一种构造演化树的实际计算方法，称为最大同步法。桔梗科6个种的数据作为例子进行说明，并对这种方法做简单的评论和比较。     

基于SVM的花岗岩薄片图像石英分割方法研究

花岗岩薄片不同矿物成分在图像中可能存在相同灰度分布甚至相似纹理。通过结合正交偏光镜镜下图片干涉色信息和单偏光镜图片信息分析,提高了花岗岩薄片石英分割的准确率。方法是从单偏光镜和正交偏光镜下图片中提取图像块的特征信息,运用支持向量机分类方法对图像块进行分类,在分类为石英的图像块中选取种子,再根据两张图片信息,用区域生长方法完成石英分割。该方法实现了自动化分割,分割准确率高,实验证明该方法切实可行。     

图片内容查询方法的历史与现状

通过基于图片内容查询方法的调查分析，讨论关于图片内容查询方面研究的过去与现状。     

基于支持向量机的图片验证码识别研究

从产品角度来看,图片验证码识别增加了时间成本和精力,因此有必要开发一个验证码图片识别系统改善工作效率。考虑到目前各种机器学习算法的优点,本文提出了基于v-支持向量分类的验证码图片识别算法,它不仅运用快速独立成分分析算法提取特征,并且利用文化算法最优化v-支持向量算法的模型核宽度和参数v。实验结果表明,数字验证码图片经过预处理后,每组图片的训练集的数字识别率为100%,而测试集的识别精度大约为99.8%。     

文本自动分类研究——基于径向基函数

目前的文本分类还是以人工分类为主,为了减少人工分类的不确定性和分类错误,将径向基函数(RBF)算法引入文本自动分类系统,实现文本的自动分类。实验结果表明,采用RBF构造的分类器在文本自动分类中具有较好的分类性能,其测试平均值(F1)比BP、kNN分类器的F1值都要高。     

VB图像处理实例之图片切割

本文讨论了VB中图片任意分割的三种实现方法,并提供其相应代码.     

基于主元分析构造强分类器的人脸检测算法

本文研究了基于特征脸的人脸检测算法,针对其分类能力差的特点,基于主元分析提取特征向量空间构造弱分类器,结合AdaBoost算法构造强分类器,提出了一种人脸检测算法。利用MIT+CMU人脸数据库测试该算法的性能,结果表明本算法在运行时间与检测正确率方面明显优于基于神经网路的算法和支持向量机算法。     

自动文本分类的可视化方法探讨

自动文本分类方法是文本分类中非常重要的一种分类方法，本文着重从模型与方法的角度进行探讨。首先给出了一个自动文本分类的形式化定义，然后提出了自动文本分类的流程模型。接着，对流程中的四个部分进行具体讨论。自动文本分类的应用非常广泛，为了叙述方便，以商务数据为例进行讨论，并且选择实例作为典型案例对自动文本分类后的可视化进行分析和具体研究。     

Low doses of a red wine ingredient figh diabetes in mice

Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said.     

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.     

Molecular motor assembly of a biomimetic system

Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction.     

To serve and promote science development via innovation

CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing.     

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.     

Tracing the origin and early radiation of birds——Paleornithologist ZHOU Zhonghe

With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants."     

The Information Environment and Universal Service

This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment.     

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.