关于仿真模型验证

本文对国内外仿真模型的发展进行了述评,陈述了仿真模型验证的定义和有关概念,提出了模型验证的区间假设检验法,介绍了自相关函数检验法。     

2008年网络管理员上半年考试分析

网络管理员考试属于全国软件水平考试中初级级别的考试。本文根据2008年5月网络管理员考试试题的情况,分析了该考试上、下午试题的特点、难点和重点。     

软件测试模型的应用研究及改进

介绍了软件测试的几种模型,包括V模型、W模型、H模型、X模型,这些模型定义了测试活动的流程和方法,为测试管理工作提供了指导,并且指出了上述测试模型的长处和局限性。针对传统的模块任务分配方式的不足,对模块分配进行细化并结合X测试模型,根据实际开发情况对X测试模型进行了相应的调整和改进。     

基于Struts＋Hibernate架构的题库系统设计与实现

传统的基于B／S模式的题库系统开发具有页面代码冗余度高,功能模块可重用性低,维护困难等问题。给出题库系统的基本架构实现方案．提出采用Struts＋Hibernate框架的题库系统设计思想,根据Struts和Hibernate优势互补的特点,研究MVC模型和持久层的整合方法。以自动组卷模块的研究为例,验证系统各层内部的紧耦合,层层之间的松散耦合,实现系统的可重用性、灵活性以及增强系统的扩展性。     

C6711 DSP和PC的HPI-USB2.0通讯链路设计

随着性能指标的提高,嵌入式系统中DSP的测试工作也日趋复杂,需要以高速率低资源占用的接口和上位机通讯。HPI可在不影响DSP主程序运行的情况下发送数据,USB2.0则可以较高的速度将数据转发给PC,HPI-USB2.0通讯链路结合了两者的优点,以简洁的硬件和软件,很好地满足了DSP的测试需求。     

软件功能测试用例的设计过程及实践

该文介绍了软件功能测试用例的设计过程在RMDB系统中的实践,并对测试用例进行评审和追踪,从而提高功能测试用例的设计效率。     

基于模拟对象Mock Object的单元测试研究

在软件测试中,单元测试不仅能够优化软件系统设计,还大大简化了功能测试的测试量。但是在一些情况下进行单元测试比较困难,本文引入了模拟对象Mock Object的概念,利用Mock Object进行单位测试,解决了传统单元测试中存在的一些问题。     

基于指纹识别技术的考试系统扩展设计与构想

在现行的考试系统中,如何准确的确定考生的身份,而防止代考现象的出现,是长期困扰教育系统的一个问题。在以往的系统中,主要采用防伪性能更好的准考证,采用学生证或者身份证与准考证结合的办法。但是,证件上的照片往往与实际的人员相貌有出入。因此,这种办法并不能解决代考现象的出现。针对考生识别工作中存在的问题,本文介绍了基于指纹识别技术的考试系统的构想与设计过程。     

Dynamic duty cycle and adaptive contention window based QoS-MAC protocol for wireless multimedia sensor networks

Rapid penetration of small, customized wireless devices and enormous growth of wireless communication technologies has already set the stage for large-scale deployment of wireless sensor networks. While the need to minimize the energy consumption has driven significant researches in wireless sensor networks, offering some precise quality of service (QoS) for multimedia transmission over sensor networks has not received significant attention. However, the emerging new applications like video surveillance, telemedicine and traffic monitoring needs transmission of wireless multimedia over sensor networks. Naturally, offering some better QoS for wireless multimedia over sensor networks raises significant challenges. The network needs to cope up with battery-constraints, while providing improved QoS (end-to-end delay and bandwidth requirement). This calls for a suitable sensory MAC protocol capable of achieving application-specific QoS. In this paper, we have proposed a new QoS-based sensory MAC protocol, which not only adapts to application-oriented QoS, but also attempts to conserve energy without violating QoS-constraints. Performance modeling, analysis and simulation results demonstrate that the proposed protocol is capable of providing lower delay and better throughput, at the cost of reasonable energy consumption, in comparison to other existing sensory MAC protocols.     

Network effects as drivers of individual technology adoption: Analyzing adoption and diffusion of mobile communication services

Adoption research has largely ignored the dynamic impact of network effects on technology adoption and diffusion. For example, some technologies become more attractive the more social peers use them as well. But adoption at the same time increases the value for the peers and thereby their adoption decisions as well. Unfortunately, interdependencies like these make adoption and diffusion patterns very complex. Drawing on network effect theory, we develop an adoption and diffusion model that explicitly considers the role of direct and indirect network effects for individual technology adoption, using mobile commerce adoption as application example. By applying a simulation approach we can exemplify and analyze the fundamental adoption dynamics given rise to by network effects. We thereby propose a way of how to incorporate network effects into adoption research and disclose the role of the technology diffusion lifecycle for individual adoption.