基于NIOSⅡ的数字电子钟设计与实现

以NiosⅡCyclone EP1C20F400C7开发板为硬件平台,利用Ouartus Ⅱ、SOPC Builder和NiosⅡIDE软件设计来实现一个基干SOPC的多功能数字电子钟,该电子钟系统由FPGA部分(包括NiosⅡCPU核、内部定时器、Avalon总线等)、存储器部分(包括SRAM、FLASH)和外围元件部分(按键、LCD显示器)三大部分构成,经过C语言编程使该电子钟具有能够在液晶屏上显示帮助信息,具有时间、日期、状态提示的功能,并可利用4个按键对时间(小时和分钟)、日期(年月日)进行设置(包括退出设置).经测试该电子钟具有较好的时间精度.     

基于SOPC的LED显示屏控制系统

系统地阐述了以Altera公司的Cycione芯片为核心的基于Nios Ⅱ软核的嵌入式16×16点阵的LED显示屏控制系统的设计方法;简要介绍了可编程片上系统(SOPC)技术的灵活性和优越性;详细介绍了Nios Ⅱ系统中PWM IP核和以太网控制模块等自定义模块的设计,结果表明采用SOPC的设计方法对LED显示屏性能有明显提高.     

新型嵌入式工业网络节点的设计

本文提出了一种适用于工业以太网控制系统的网络节点软、硬件设计方法。该方法选用Altera开发平台和新型的Nios Ⅱ系列CPU作为处理器来构建嵌入式工业以太网系统的节点；运行嵌入式实时操作系统μC／OS Ⅱ，可满足工业现场对实时性和可靠性的要求。     

基于EM78447单片机廉价电话计费器的研制

介绍采用EM78447单片机控制的电话计费器的电路结构与软件设计原理。经过实验，证明了该电话计费器可实现市话、长话的计时、计费功能，并且硬件成本低、功能强。     

80C196KC单片机在广播发射机中的应用

利用80C196KC单处机的独有特性,辅以外设电路,成功地实现了对发射机的各种参数的采集,实时监控,具有结构简单,抗干扰性强,便于维修等优点。     

基于SOPC的视频画面分割器的设计

研究一种基于SOPC技术的视频画面分割器的设计。该系统通过在FPGA芯片上配置NiosⅡ软核处理器和相关的接口模块来实现其主要的硬件电路,并结合系统的软件设计来控制多路高速多功能视频解码芯片ADV7181,实现对图像数据的高速采集、有效抽取及压缩、存储、画面数据合成及显示等功能。     

基于图形终端外接设备统一管理的研究

根据住房公积金行业图形终端外设种类多、难于管理的情况,利用远程桌面协议、套接字、驱动封装等技术设计图形终端外设管理系统,实现对图形终端外设集中管理。     

基于VHDL语言的出租车自动计费器的设计

随着出租车行业的发展,对出租车计费器的要求也越来越高.二十世纪后丰期,通过EDA技术对大规模可鳊程逻辑器件编程,产品得到了大力的发展,这种方法不仅成本低、周期短、可靠性高,而且可随时在系统中修改其逻辑功能.     

计算机功能互补系统

发明人王迪兴设计的计算机功能互补系统,一是作为并行多向立交总线,解决服务器或大数据库的并行存检或透明存储透明检索问题,及外设并行工作及实时交互作用的问题——具多功能一体化特征——统一并行运算、交换、控制功能,可用于多点并行检测或监控;二是作为联想存储器,解决机器智能低下问题。因这种存储器的存储单     

基于Multisim的出租车计费器仿真研究

建立了基于Multisim的出租车计费器仿真模型,给出了仿真结果。仿真和分析表明设计方案合理。教学实践证明,通过实施项目教学法,激发了学生的学习兴趣和学习热情,最大程度的发挥学生的主观能动性,从而达到提高教学质量的目的。     

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