LSE method using the CHSS model

Testing the reliability at a nominal stress level may lead to extensive test time. Estimations of reliability parameters can be obtained faster thanks to step-stress accelerated life tests (ALT). Usually, a transfer functional defined among a given class of parametric functions is required, but Bagdonavi?ius and Nikulin showed that ALT tests are still possible without any assumption about this functional. When shape and scale parameters of the lifetime distribution change with the stress level, they suggested an ALT method using a model called CHanging Shape and Scale (CHSS). They estimated the lifetime parameters at the nominal stress with maximum likelihood estimation (MLE). However, this method usually requires an initialization of lifetime parameters, which may be difficult when no similar product has been tested before. This paper aims to face this issue by using an iterating least square estimation (LSE) method. It will enable one to initialize the optimization required to carry out the MLE and it will give estimations that can sometimes be better than those given by MLE.     

论反垄断法对因特网的规制

因特网虽然是一个虚拟的世界 ,但同样存在垄断问题。现存反垄断法应审慎干预 :在界定相关市场时要充分考虑这个产业的自身特点 ;在规制具体的垄断行为时 ,要有针对性 ,并着重解决本地接入、接入软件和域名等领域已存的具有严重危害性的垄断行为 ;电子商务世界的垄断问题更应引起我们的关注 ,努力为其创造一个良好的发展环境     

SOC芯片的Top-Down设计方法

基于单芯片系统是电子技术发展的主流,可改变传统的系统软、硬件设计方法,介绍了单芯片系统的支撑技术棗自顶向下设计方法的思想,讨论了其相关的信号处理系统设计自动化和软/硬件协同验证技术。结合GPRS终端数字基带处理器芯片设计,说明这一方法在单芯片设计中的应用。     

中国软件市场的细分与发展

软件产业是我国近些年发展最快的一个产业。深入分析细分软件市场的构成 ,不同细分软件市场的发展现状 ,以及未来发展的方向 ,对于加快我国软件产业的发展具有积极的现实意义     

试验机的增量式PID控制系统研制

本文介绍了利用增量式PID控制算法，采用MCS51单片机对试验机进行控制，使试验机达到恒加载速率、恒应力和恒应变等的要求。     

Linear Bayesian Inference for Accelerated Weibull Model

In this paper, we present a Bayesian approach for inference from accelerated life tests when the underlying life model is Weibull. Our approach is based on the General Linear Models framework of West, Harrison and Migon (1985). We discuss inference for the model and show that computable results can be obtained using linear Bayesian methods. We illustrate the usefulness of our approach by applying it to some actual data from accelerated life tests. This revised version was published online in July 2006 with corrections to the Cover Date.     

利用计算机提高专业课程实践教学环节成绩评定的科学性

文章对如何利用计算机技术提高工科专业毕业设计成绩评定的科学性、公正性进行了探讨.     

高等学校数学教学改革的研究

为了适应 2 1世纪我国社会主义建设对培养跨世纪高素质人才的需要 ,使高等教育的改革和发展能够适应面向 2 1世纪社会发展和经济建设的需求 ,对我院数学课程教学内容和教学方法的改革提出一些设想和措施并付诸实施 ,收到了良好的效果。     

High Stakes: Time Poverty,Testing, and the Children of the Working Poor

Sociological interest in the implementation of policy generally focuses on the ways a single stream of policy creates a set of measurable consequences either for parents or children. This article takes an ethnographic approach to the study of conflicting policy mandates that collide in the lives of families moving from welfare to work at the same time that schools are implementing high stakes tests and the end of social promotion. We show that these two policies make contradictory demands on parents, to the potential detriment of children. Ethnographic research reveals the ways in which multiple and incompatible forms of policy impact poor families, putting them in the unhappy position of choosing between economic stability or mobility and children's educational performance.     

基于虚拟技术链的软件协作开发模式研究

探讨了基于多赢模式的软件协同开发模式,提出了在特定技术环境下一些新的开发思路和概念、虚拟技术链的概念和模型,利用工程化的方式对软件开发的过程及效率进行职能分配、过程管理和控制,以期获得较好的开发效率。