C#中的泛型机制

泛型程序设计思想经常出现在软件理论研究和抽象算法的设计中,用于表示复杂结构和算法中具有共同性质的东西,常被人们看成是继面向对象程序设计思想之后的又一场新的软件设计思想的革命,掌握泛型开发方法和技术可以大大提高程序员的设计能力.C#是实现net技术的核心语言,支持泛型程序设计思想成为其主要的发展方面,在它推出的试用版本20(beta)中已经提供了泛型开发机制,本文将从语言机制的角度分析C#中采用的泛型程序设计技术,最后是对C#泛型机制特点的分析.     

3S技术背景下的飞行程序设计应用

随着计算机技术与地理信息技术的不断发展,在飞行程序设计的实施过程之中应用地理位置信息系统、全球定位系统以及遥感技术(简称3S)已经成为发展所需,而这一综合技术的使用,可以直观的呈现影响净空条件的机场地面障碍物的空间位置以及高程信息,直接关系到飞行程序设计的准确性和安全性。所以,本文就3S技术背景下的飞行程序设计应用进行探讨。     

面向对象的文献数据库设计

面向对象程序设计方法学是一种支持模块化程序和软件重用的实际可行的编程方法，把程序设计主要活动集中在建立对象和对象之间的联系(或通信)上，从而完成所需要的计算。一个面向对象程序就是相互联系(或通信)的对象集合。现实世界可以抽象为对象和对象相互的集合，面向对象程序设计方法学是一种更接近现实世界的、更自然的程序设计方法学。根据此思路可设计出一个实际可行的面向对象的文献数据库。     

Java程序设计的教学改革研究

Java是一门很优秀的编程语言,JAVA以其跨平台性和安全性而得到广泛应用。在当今,JAVA程序设计在几乎全部的大学计算机专业中都是开设了的。本人根据多年实际教学经验总结了以下几点对Java程序设计的教学改革研究的几点看法。     

计算机程序设计课程教学方法探讨

在计算机快速发展的今天,它己经成为每个学校的都具有的热门专业,而计算机程序设计是学习计算机的一个非常重要的而又必不可少的一门课程。下面根据自己在这一年来《C#程序设计》的教学经验来分析在程序设计教学过程中,怎样能让学生学好这门课程。主要是培养学生的主动性、以及教程序设计课程所要用的教学方法和考核方法。     

《高级语言程序设计(C)》课程网站的设计与实现

计算机网络技术的快速发展,为人们接受更多的信息和知识提供了更多便捷条件,人们可以充分利用互联网平台汲取更多信息,不断提升自我。高级语言程序设计(C)是理工科专业的基础课程之一,涉及到高级语言程序设计和移动学习等相关知识。课程网站的设计,不仅能够提高高级语言程序设计课程的效率,而且能够有效提高学生的知识层次和实践水平。本文拟从高级语言程序设计(C)课程网站建设的必要性出发,分析课程网站设计的特点和需要注意的问题,并为大家展现课程网站具体的实现方式,实现课程网站稳定可持续发展。     

计算思维导向下任务驱动型程序设计教学改革

计算思维是信息技术学科的核心素养之一,程序设计的任务是使用计算思维来分析和解决实际问题,而不仅仅是简单的编码。该文在计算思维导向的C语言程序设计教学过程中,提出任务驱动型和知识体系重构的教学方法,来培养学生灵活运用程序设计求解工程问题的能力。     

VB程序设计教学方法浅谈

传统程序设计一般采用模块化结构的思想,是一种面向过程的程序设计方法,就是做什么、怎么做的过程。而VB是面向对象的程序设计方法,是以事件驱动为目的的。本文通过分析Visual Basic程序设计课程的特点,对该课程教学思想、教学方法与教学过程方面作了一些探索和实践。     

VB制作图片浏览器

介绍了用Visual Basic编制的一个简单而又实用的小程序,该程序可以浏览多种格式的图像文件,并可以放大或缩小图像对VB程序设计感兴趣的人员有所帮助。     

基于西门子STEP7设计平台的程序设计

本文介绍的是作者在实际工作中使用西门子STEP7设计平台程序设计而总结出的相关经验,并介绍了PLC程序设计的基本设计方法,并将PLC程序设计的几种方法进行对比分析,总结出各个程序设计方法的优势与不足,并针对实际项目设计给出合理的程序结构,并希望通过此文使得相关从业人员或初学者对工业自动化领域的PLC程序设计有一定的了解和更深层的理解。     

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.     

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.     

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.     

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.     

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