工程图学网络学习系统的设计与分析

针对目前工程图学教学和学习过程中存在的问题,提出了一种基于Web的工程图学网络学习系统的设计方案,并介绍其开发思路、开发方法和技术路线。该设计方案由前台浏览练习访问模块和后台数据库管理应用模块组成。这种设计方案把应用环境和开发环境分离开来为应用程序的开发和实现提供了很大的方便,同时这种开发模式逐渐成为必需的发展趋势。     

高校图书馆信息资源建设

本文从国内外信息资源建设现状的对比,剖析了我国图书馆电子信息资源建设的现状,阐述了应该通过网络系统环境建设、信息资源数据库的建设、人才队伍建设等几个方面的工作,才能做好高校图书馆电子信息资源建设。并提出了进一步完善电子信息资源服务的具体办法,以及建设中应注意的问题。     

PCS网络中一种改进的呼叫建立算法

PCS系统中,用户漫游到非归属VLR覆盖区被呼时,系统将产生大量信令开销和数据库访问开销。该文为移动用户被呼提出了一种改进的缓冲呼叫算法来降低网络信令开销与数据库访问负荷和呼叫建立时延,建立了一种模型来分析其相关性能。与传统呼叫算法相比,改进呼叫算法能极大降低系统开销,具有较强的可行性。     

用一个ASP页面实现对多个数据库查询

在网站后台数据库查询程序设计中,本文解决了三个关键问题:(1)在表单内插入一个名称为“Send”的隐藏字段,将表单网页和表单处理程序合并为一个ASP程序,从而避免了用户多次查询时在两个页面之间的频繁切换。(2)在函数调用时,通过变换参数的方法实现了对不同数据库的选择查询。(3)利用数组存储技术和循环控制结构,将多种查询结果组织在同一个页面之内,不仅方便了用户浏览,而且减少了网页维护的负担。     

基于C#应用的ADO.NET数据库访问技术

笔者在开发并研究基于C#应用的机场指挥系统中,面对大量、复杂数据库,如何利用ADO.NET数据库访问技术提高其访问效率是个重要技术难点。通过分析ADO.NET数据库访问技术的应用,促使C#应用能突破自身瓶颈,优化性能。     

数据挖掘中属性项压缩的统计方法研究

文章试图将统计思想与(Rough)粗糙集理论相结合,针对事务性数据库属性项压缩问题提出了一些行之有效的方法,即基于重要性的属性压缩、基于相依性的属性压缩、属性项的广义线形分析及压缩、基于多重相关性的属性项压缩,以此达到数据库压缩之目的。     

The German Administrative Record Census – An object identification problem

Summary: The next German census will be an Administrative Record Census. Data from several administrative registers about persons will be merged. Object identification has to be applied, since no unique identification number exists in the registers. We present a two–step procedure. We briefly discuss questions like correctness and completeness of the Administrative Record Census. Then we focus on the object identification problem, that can be perceived as a special classification problem. Pairs of records are to be classified as matched or not matched. To achieve computational efficiency a preselection technique of pairs is applied. Our approach is illustrated with a database containing a large set of consumer addresses.*This work was partially supported by the Berlin–Brandenburg Graduate School in Distributed Information Systems (DFG grant no. GRK 316). The authors thank Michael Fürnrohr for previewing the paper. We would like to thank also for the helpful comments of an anonymous reviewer.     

Not all computerized cheating tasks are equal: A comparison of computerized and non-computerized versions of a cheating task

Computerized versions of population inferred cheating tasks (C-PICT)—i.e., tasks in which dishonesty is statistically determined on the aggregate by comparing self-reported outcomes with a known probability distribution—have become increasingly popular. To this date no study has investigated whether non-computerized population inferred cheating tasks (PICT) and C-PICT as well as different implementations of C-PICT produce similar results. The current study tackles both issues via a well-powered pre-registered online experiment (N = 3,645) with four conditions. Participants played either a non-computerized coin toss task (CTT) (C1) or one of three computerized CTT: a computerized CTT provided via an external website (C2), a computerized CTT provided within the survey framework of the study in which participants were explicitly informed that the actual outcome of the CTT was not monitored (C3), or a computerized CTT provided within the survey framework of the study in which participants were explicitly informed that the actual outcome of the CTT was monitored (C4). A priori we expected the probability of dishonesty to be higher in C1 compared to C2, C3, and C4, as well as lower in C4 compared to C3 and C2. Results show that the probability of dishonesty is higher in C1 and C2 compared to C3 and C4. Conversely, no significant difference was observed between C1 and C2, nor between C3 and C4. Taken together, our results indicate that C-PICT produce results similar to PICT when they are provided via an external website, but not when they are implemented within the survey framework of the study.     

Business-centered versus socially responsible corporate diversity communication. An assessment of stakeholder (dis)agreement on Twitter

This study assessed the business-centered and CSR-centered diversity communication of five American corporations along with the ensuing responses on the microblogging platform Twitter, the present analysis contributes to the literature on online diversity communication and public relations. The results revealed that companies that had long-term consistency in approaching diversity as CSR received more agreeable responses than those that made swift changes in the aftermath of increased pressure from activist groups. In addition, companies that communicated to a greater degree about the impact of diversity on the bottom line engendered higher user agreement than those who discussed diversity primarily from a CSR perspective.The results shed light on the importance of message consistency throughout longer periods of time.     

网络新媒体语境下口语表达课程创新研究

网络新媒体具有不同于传统媒体的特点,在网络新媒体语境下,网络新媒体人的素养也应提高。要想培养出网络新媒体语境下的优秀人才,口语表达课程必须创新,加强语音的标准度和优美度训练,校企合作,为学生提供实践平台,还要对学生进行专项训练,提升学生的专业素养,应用立体化教材,使考试形式多样化。