智能手机风云演义

据说,谈到对手机的爱好问题,普通青年用iPhone,文艺青年用索尼爱立信,技术青年用黑莓,富二代青年用Vertu,白领青年用HTC,二逼青年用三星,外来工青年用摩托罗拉,学生青年用山寨,农民工青年用诺基亚……     

基于用例的需求建模方法

传统的软件需求规约是采用功能分解的方式来描述系统功能,而采用用例的方法进行需求获取和建模,是以用户为中心的建模方法.用例模型是由用例图和用例规约所组成的.用例图用来规定系统的行为,用例规约是用文档的形式对每个用例进行描述的.通过对银行系统进行基于用例的需求分析和建模,可以了解用例模型的益处.     

一个用例层次模型及工具开发

用例描述通常采用单一层次结构,不能充分实现用例描述的复用。文章在深入研究已有的用例描述方法的基础上,提出了一种用例描述层次模型。该模型将用例分为服务层、结构层和事件层三个抽象层次来描述,容易保证用例间的一致性,且可以灵活实现系统间、用例间和用例内部用例描述的重用。文章最后还讨论了有关工具的开发。     

一种测试用例库的建设方法研究与实践

在软件质量管理过程中,测试用例的设计起着至关重要的作用,用例的好坏直接决定着测试工作的结果和效率。基于此,进行新型测试用例库建设研究。在探究用例库的建设过程中,我们从用例标准、复用和维护三方面进行考虑。用例库要能实现用例的结构化管理,才能实现用例规范,从而便于管理、检索和复用;用例库必须为测试需求分析与用例设计过程提供便捷的方式来查找目标用例,以便直接复用或变更;用例的维护需要提炼用例中关键的信息做管理和维护。     

CSDN 9月文挡&论坛TOP 10

技术文档主题:对 UML 建模的几点体会作者:XiaoyshID:32231摘要:用例图和用例是两回事。用例图是描述用例和 actor 关系的图,用例之间的关系可通过不同的包组织来体现的,而用例间的使用、     

T出精彩--SONY VAIO T17C/S、T15C/T

用一上午调节心情,用一刻钟寻找流行,用三十秒邂逅缘分,用一小时熏陶气氛。本本时尚,时尚人生。     

为什么用例如此重要

为什么用例如此重要?一言以蔽之,这是因为:用例是一种普遍存在的客观现实。我觉得,与其说亚各申博士发明了用例,还不如说他早在20年前就发现了用例这种客观现实,并最终发明了用例表示和用例驱动软件过程的方法。     

软件开发中的用例分析技术

用例技术是通过用例、参与者与用例以及用例之间的关系来描绘系统外在需求的一种方法.作为UML(统一建模语言)的一种重要表示法,用例分析方法在软件开发过程中占据着重要的地位.正确使用用例分析方法有助于项目的需求分析、体系结构设计、进度安排、测试和验证.文中简要介绍了增量/迭代式软件过程,通过实例探讨了软件开发中如何使用用例分析技术,包括项目风险分析、确定系统边界、细化事件流、图形化用例以及用例归档技术,从而为获取用例模型提供了有效的方法和途径.     

用例分析技术在需求建模中的应用

用例分析技术通过用例、执行者以及用例之间的关系来描绘系统外在可见的需求情况。文中介绍了用例分析技术易于软件开发人员与用户之间开展沟通与交流的特点，阐明了用例分析技术有助于提高需求分析的效率和质量。通过高炉开炉装料系统的开发实践，从执行者、用例和用例规约三方面，探讨了用例分析技术的建模步骤，从而描述了一种使用用例分析技术开展需求建模的有效的实现方法。     

用例分析技术在需求建模中的应用

用例分析技术通过用例、执行者以及用例之间的关系来描绘系统外在可见的需求情况。文中介绍了用例分析技术易于软件开发人员与用户之间开展沟通与交流的特点,阐明了用例分析技术有助于提高需求分析的效率和质量。通过高炉开炉装料系统的开发实践,从执行者、用例和用例规约三方面,探讨了用例分析技术的建模步骤,从而描述了一种使用用例分析技术开展需求建模的有效的实现方法。     

How practice produces suboptimal heuristics that render backup instruments ineffective

The operation of machines typically requires attention to instruments that signal the state of the machine. One safeguard against primary instrument malfunction is to provide backup instruments, but this works only if the operators react to malfunction by switching attention to the backups. Little is known about the effect of negative outcomes or feedback on allocation of attention to backup instruments. Four experiments demonstrated that prior practice causes operators of a simulated machine to adapt to instrument malfunction by changing to a suboptimal decision rule rather than by reallocating attention to a different set of instruments. This fallacy appears linked to the operators' failures to notice feedback that they should switch during the simulations and operators' failures to correctly interpret outcome feedback following the simulations. The results raise theoretical questions and warn interface designers not to overrate backup instruments.     

How practice produces suboptimal heuristics that render backup instruments ineffective

The operation of machines typically requires attention to instruments that signal the state of the machine. One safeguard against primary instrument malfunction is to provide backup instruments, but this works only if the operators react to malfunction by switching attention to the backups. Little is known about the effect of negative outcomes or feedback on allocation of attention to backup instruments. Four experiments demonstrated that prior practice causes operators of a simulated machine to adapt to instrument malfunction by changing to a suboptimal decision rule rather than by reallocating attention to a different set of instruments. This fallacy appears linked to the operators' failures to notice feedback that they should switch during the simulations and operators' failures to correctly interpret outcome feedback following the simulations. The results raise theoretical questions and warn interface designers not to overrate backup instruments.     

Development of a strategic research plan for an academic department through the use of quality function deployment

Quality Function Deployment (QFD) is a popular approach for formalizing the process of listening to “the voice of the customer,” and assigning responsibilities to members of an organization in an effort to respond effectively to customer needs, QFD is being used by the Department of Industrial Engineering at Mississippi State University to help identify key customers for departmental research efforts, to identify and track the research needs of those customers, to fashion a comprehensive strategic plan for departmental research activities based on customer needs, to deploy various research functions and responsibilities to specific faculty members or groups, and to track research performance relative to goals. This approach appears to be an excellent means of formalizing the process of strategic research planning.     

Design, fabrication, and testing of silicon microgimbals forsuper-compact rigid disk drives

This paper documents results related to design optimization, fabrication process refinement, and micron-level static/dynamic testing of silicon micromachined microgimbals that have applications in super-compact computer disk drives as well as many other engineering applications of microstructures and microactuators requiring significant out-of-plane motions. The objective of the optimization effort is to increase the in-plane to out-of-plane stiffness ratio in order to maximize compliance and servo bandwidth and to increase the displacement to strain ratio to maximize the shock resistance of the microgimbals, while that of the process modification effort is to simplify in order to reduce manufacturing cost. The testing effort is to characterize both the static and dynamic performance using precision instrumentation in order to compare various prototype designs     

集群负载均衡--CSM的实现

对于现在的互联网络通信状况,负载均衡显示其越来越多的重要性,通常实现负载均衡是使用软件并结合相应的算法,该文所描述的是利用Cisco公司的CSM模块来实现安全可靠的负载均衡,CSM模块将客户机的请求分发到不同的虚拟服务器,配合Cisco MSFC模块并合理地进行DNS的配置,实现网络服务的负载均衡。简要介绍了CSM模块的工作原理,如何配置DNS,如何设置虚拟主服务器,以及如何对系统CSM模块进行设置做了描述。     

A self-adaptation scheme for workflow management in multi-agent systems

Business processes, operational environment, variability of resources and user needs may change from time to time. An effective workflow management software system must be able to accommodate these changes. The ability to dynamically adapt to changes is a key success factor for workflow management systems. Holonic multi-agent systems (HMS) provide a flexible and reconfigurable architecture to accommodate changes based on dynamic organization and collaboration of autonomous agents. Although HMS provides a potential architecture to accommodate changes, the dynamic organization formed in HMS poses a challenge in the development of a new software development methodology to dynamically compose the services and adapt to changes as needed. This motivates us to study and propose a methodology to design self-adaptive software systems based on the HMS architecture. In this paper, we formulate a workflow adaptation problem (WAP) and propose an interaction mechanism based on contract net protocol (CNP) to find a solution to WAP to compose the services based on HMS. The interaction mechanism relies on a service publication and discovery scheme to find a set of task agents and a set of actor agents to compose the required services in HMS. We propose a viable self-adaptation scheme to reconfigure the agents and the composed services based on cooperation of agents in HMS to accommodate the changes in workflow and capabilities of actors. We propose architecture for our design methodology and present an application scenario to illustrate our idea.     

The Content Control That Wasn't: Two Years of the Online Services Amendment

The stated aims of the Broadcasting Services Amendment (Online Services) Act were to provide a means for addressing complaints about Internet content, to restrict access to Internet content likely to cause offence to a reasonable adult and to protect children from exposure to Internet content unsuitable for them. However, two years after the Amendment took effect, it can be seen that while some marginal changes may have occurred, in reality the Act has failed to regulate or control Internet content or Australians' access to it. It may, however, have met other objectives attributed to the Government--for example, appeasing community concern by giving the appearance that action had been taken to control 'problematic' Internet content while not overly burdening the Australian Internet industry.     

Strategies for adding features to CAD models in order to optimize performance

This paper presents an approach which enables new parameters to be added to a CAD model for optimization purposes. It aims to remove a common roadblock to CAD based optimization, where the parameterization of the model does not offer the shape sufficient flexibility for a truly optimized shape to be created. A technique has been developed which uses adjoint based sensitivity maps to predict the sensitivity of performance to the addition to a model of four different feature types, allowing the feature providing the greatest benefit to be selected. The optimum position to add the feature is also discussed. It is anticipated that the approach could be used to iteratively add features to a model, providing greater flexibility to the shape of the model, and allowing the newly-added parameters to be used as design variables in a subsequent shape optimization.     

Product selection for promotion planning

This paper addresses a very important question—how to select the right products to promote in order to maximize promotional benefit. We set up a framework to incorporate promotion decisions into the data-mining process, formulate the profit maximization problem as an optimization problem, and propose a heuristic search solution to discover the right products to promote. Moreover, we are able to get access to real supermarket data and apply our solution to help achieve higher profits. Our experimental results on both synthetic data and real supermarket data demonstrate that our framework and method are highly effective and can potentially bring huge profit gains to a marketing campaign.     

卫星伪距定位精度模拟评估软件设计

基于研发人员进行嵌入式导航型用户设备的研究工作中,需要全面考虑各种因素对定位精度的影响,研究提高用户设备定位精度的方法。本文提出设计卫星伪距定位精度评估软件的方法,该软件具有对影响伪距定位精度的多种算法进行评估功能,还具有选取用户机软硬件设备、研究选星方法等功能,为研发人员提高伪距定位精度提供了一种有效的手段。