可调遥控电源开关的设计与实现     

姜海  张海英 《科技广场》2010,(9)

随着社会的发展,电子产品在人们的日常生活中得到越来越广泛的应用,并向以体积小、重量轻、效率高、稳定性强等为优点方向发展。电源技术尤其是数控电源技术是一门实践性很强的工程技术,服务于各行各业。本文介绍可调遥控电源开关的设计,该设计采用红外遥控系统,由红外遥控发射电路发射红外信号,通过红外遥控接收电路接收信号并进行解调,控制电源电路输出所需电压。  相似文献   

Assessing the impact of e-procurement on the structure of the buying centre     

M. José Garrido-Samaniego  A. María Gutiérrez-ArranzAuthor VitaeRebeca San José-CabezudoAuthor Vitae 《International Journal of Information Management》2010

The purpose of this research is to analyse empirically how the use of Internet at the various stages of e-procurement impacts the organisational structure of the buying centre in terms of size and composition for a capital good. In this high-risk situation organisational buyers typically undertake extensive, deliberate choice processes involving numerous sequential phases. Interdepartmental coordination is required to specify, amongst others, the most suitable type of equipment in terms of capability, maintainability or costs. Information and communication technologies have changed the way we interact and communicate at different levels, amongst individuals within a single organisation as well as amongst different organisations (for example, with suppliers). A survey was performed using a questionnaire sent to a sample of industrial firms from different sectors. Results show that the size and composition of the buying centre varies at the different stages of the e-procurement process and that the use of Internet leads to an increase in the number of functional areas that intervene in the buying centre. The aims and implications for managers and researchers are discussed.  相似文献   

近五年《大学图书情报学刊》载文引文统计分析     

高旭虹 《大学图书情报学刊》2006,24(1):89-91

文章运用文献计量学的方法,对2001-2005年2月<大学图书情报学刊>的载文、引文情况进行了统计分析,为该刊今后的发展提供参考数据.  相似文献   

对数据库引进工作的思考与实践     

张敏 《高校图书馆工作》2006,26(6):12-16

文章对图书馆引进数据库时需要考虑的因素、基本流程、需要注意的问题等进行了较为系统的阐述,并结合工作实践,简要介绍了暨南大学图书馆引进数据库工作的一些方式、方法.参考文献5.  相似文献   

电子资源绩效评估初探   总被引：8，自引：0，他引：8  

余海宪 《高校图书馆工作》2006,26(1):33-35

电子资源绩效评估是电子资源评估体系的重要组成部分.本文讨论了电子资源绩效评估的重要性,对各种评估方法及其局限性进行了讨论.最后对发展电子资源绩效评估提出了建议.参考文献5.  相似文献   

树立精品意识创办一流学报——办好《高等学校化学学报》的体会   总被引：24，自引：8，他引：16  

刘永新  向政 《编辑学报》2002,14(3):214-215

以详实的数据和资料系统、简明地总结了高等学校化学学报编辑部的办刊成果,介绍为创办一流学报所采取的一些可行措施.  相似文献   

视质量为生命求发展为动力——《武汉体育学院学报》2001年工作的回顾与展望     

康昌发  付志华  何永康 《武汉体育学院学报》2002,36(1):1-4

《武汉体育学院学报》2001年上了一个新台阶，进了一个新层次，取得了创刊以来的最好成绩。科学总结与分析了成功的经验，即正确的领导与决策是关键，编辑观念的转变是保障，狠抓学术质量和编辑出版质量是重心，追求发展是动力，并提出了改进《武汉体育学院学报》工作的设想和措施。  相似文献   

电子商务的特点浅析     

袁畅  潘纹  石兰东 《黄冈职业技术学院学报》2003,5(3):82-83

电子商务作为一种新生事物具有其鲜明特点。本文从运营环境、与传统交易比较两方面分析其特点。  相似文献   

Cheating in e-exams and paper exams: the perceptions of engineering students and teachers in Norway     

Aparna Chirumamilla  Guttorm Sindre  Anh Nguyen-Duc 《Assessment & Evaluation in Higher Education》2020,45(7):940-957

Abstract

A concern that has been raised with the transition from pen and paper examinations to electronic examinations is whether this will make cheating easier. This article investigates how teachers and students perceive the differences in ease of cheating during three types of written examination: paper exams, bring your own device e-exams and e-exams using university-owned devices. It also investigates perceptions about the effectiveness of some typical countermeasures towards cheating across these examination types. A mixed-method approach was used, combining questionnaires and interviews with students and teachers in the authors’ own university. A total of 212 students and 162 teachers participated in the questionnaire survey, and then, a more limited number were interviewed to get a deeper understanding of the results. Six-different cheating practices were considered – impersonation, forbidden aids, peeking, peer collaboration, outside assistance and student–staff collusion and seven different countermeasures were considered – proctors, biometry, mingling, shuffling, random drawing, sequencing and broadcasting. Both students and teachers perceived cheating as easier with e-exams, and especially with bring your own device. They also thought some countermeasures would be easier to implement with e-exams.  相似文献   

中小企业网上经营策略探析     

林翊 《福建师大福清分校学报》2004,(1):16-19

本文认为，在E时代的今天，我国中小企业必须充分认识到网上经营这一全新经营方式的优势，尽快展开网上经营以增强竞争力。对于中小企业如何展开网上经营。文章结合全国中小企业网上经营的现状深入分析了中小企业网上经营所必须面临的一系列的商业决策的转变，并在此基础上对中小企业网上经营策略做进一步考察，深化了对中小企业网上经营的认识。  相似文献