WINDOWS系统的维护技术概述

介绍了瑞星杀毒软件在实际应用中遇到问题的一些解决方法。说明了使用GHOST技术进行操作系统的备份和快速恢复的操作步骤与方法,指出运用WINDOWS维护技术可以延长操作系统的维护周期,提高工作效率。     

自由软件运动对软件私权体制的实践批判

风靡全球的自由软件运动并不是一种单纯的技术运动或经营模式创新，而是在提倡和实践着一种新型的社会交往方式，意味着一种值得追求的社会理想。它与现行的软件私权体制及其意识形态发生着冲突。理查德·斯多尔曼深刻地批判了私权软件体制，这种批判不仅是理论上的，更是通过自由软件运动的实际发展现实地展开的。分析斯多尔曼定义的“私权软件体制”的含义、本质及其对社会的危害，并把斯多尔曼的思想与当代信息化的资本主义的现状进行初步的比较，对于我们深入研究自由软件运动有重要意义。     

我国中小软件企业发展中的问题与建议

中国软件产业基本上是由中小软件企业构成的。发展中国软件产业,要高度重视中小软件企业的生存与发展。就软件企业内部来说,要抓技术创新,要积极开拓国内外软件市场;同时,在宏观政策上,应给予它宽松的外部环境。着重分析了我国中小软件企业的现状及其存在的主要问题,同时提出了加强技术创新等建议。     

《动物分类》CAI课件的设计与开发

本文记述了《动物分类》CAI课件的设计与开发,着重探讨了建构主义学习理论、Internet资源在中的应用以及CAI课件稿本的编写。     

普通高校本科软件工程专业知识结构的探讨

通过对国内外软件人才培养计划的分析,结合我国软件人才的培养目标,在总结自身情况的基础上,提出了普通高校软件工程专业本科毕业生应具备的本科知识结构,并对其实现途径进行探讨。     

Optimum release time of a software under periodic debugging schedule

In this paper, we study the problem of finding the optimal release time of a software meant to be marketed over a finite time horizon. The optimal design scheme considers reduction of the whole cost, achievement of a specified reliability with some high probability, or a combination of the both. We assume that the software is debugged periodically and the bug detection rates in the pre-release and post-release periods are different. We derive the optimal solution in each case. We also demonstrate the utility of the results through simulations, leading to different types of graphs showing the relationship between the target reliability, specified budget and the optimal number of additional debugging periods.     

Software reliability assessment using accelerated testing methods

The use of operational profiles and usage-based testing has received considerable attention recently in the software engineering literature. Testing under the actual operational profile can, however, be expensive, time consuming or even infeasible in situations where the performance of a system is dominated by infrequent but highly critical events. We consider a real application that deals with telecommunications network restoration after network failure caused by cuts in fibre optic cables. We use this application to demonstrate the usefulness of traditional accelerated testing methods to test and estimate software reliability. These methods, which have been extensively used in hardware reliability, have an important role to play in software reliability assessment as well.     

Discussion

A number of studies have investigated the numerical reliability of the GAUSS Mathematical and Statistical System by Aptech Inc. Those studies identified several critical accuracy errors for different computational methods. We conducted comprehensive tests of this widely used package on estimation, statistical distributions, and random number generation and found that GAUSS 8.0 still has serious problems, especially with statistical distributions and random number generation.     

The development of preventive methods in child welfare

Past approaches, current trends and future directions in primary preventive social work are reviewed with an emphasis on child abuse and neglect. An historical analysis reveals the bases for current methods of dealing with social problems. In describing current practices, several models for the delivery of human services are defined. This review concludes with an overview of recent research on primary prevention in social welfare.     

The Economics of Public Beta Testing

A growing number of software firms now rely on public beta testing to improve the quality of their products before commercial release. While the benefits resulting from improved software reliability are well recognized, some important market‐related benefits have not been studied. Through word‐of‐mouth, public beta testers can accelerate the diffusion of a software product after its release. Additionally, because of network effects, public beta testers can increase users’ valuation of a product. In this study, we consider both reliability‐related and market‐related benefits, and develop models to determine the optimal number of public beta testers and the optimal duration of testing. Our analyses show that public beta testing can be profitable even if word‐of‐mouth and network effects are the only benefits. Furthermore, when both benefits are considered, there is significant “economies of scope”—the net profit increases at a faster rate when both word‐of‐mouth and network effects are significant than when only one benefit is present. Finally, our sensitivity analyses demonstrate that public beta testing remains highly valuable to software firms over a wide range of testing and market conditions. In particular, firms will realize greater profits when recruiting public beta testers who are interested in the software but unable to afford it.