密立根油滴实验的计算机仿真系统

阐述了密立根油滴实验计算机仿真系统的模块结构、人机界面、传真原理及一些核心思路,该系统采用了基于Windows的32位打骂视化面向对象的编程环境DELPHI,简单实用,对于其它的实验系统的实现也具有一定的参考价值。     

Reusing Test Cases Based on the Function Point

Reusing test cases from existing test case library is quite common in the software testing field. Testing practice tells us that there is a strong relationship between the granularity of a function unit under testing and that of the test case. A function unit with small granularity usually results in the test cases with the same small granularity. Therefore a test case defined as the function point,i. e.,the smallest size function unit,was provided for the first time.Though test cases with smaller granularity usually have better reusability,the cost of accurately reusing and integrating such test cases is also higher. In order to balance the test case reusability and the cost of test case reuse,a novel test case reuse model based on the function point was proposed in this paper. In this model,a reusable test case for specification-based testing was defined and some reuse strategies and three formal reuse methods were given. Finally,the complete automatic software process was realized by a reusing generation tool. The new method has improved reuse accuracy,while greatly enhances the software productivity.     

面向应用领域的软件质量特性分析

随着信息技术的快速发展, 软件质量已经成为用户最为关心的问题. 但由于目前较难证明软件产品的正确性, 因此一直没有一个令人信服的软件质量评价方法. 特别是已有的软件质量评价方法基本上都采用同一种评价指标对不同领域的软件进行评价, 缺乏对不同领域软件的个性化评价指标. 针对不同领域的软件质量需求和应用, 提出了不同的软件质量评价指标, 为建立面向领域的软件产品基准体系提供依据, 以满足软件产业发展的需要.     

The Web Application Test Based on Page Coverage Criteria

Software testing coverage criteria play an important role in the whole testing process. The current coverage criteria for web applications are based on program or URL. They are not suitable for black-box test or intuitional to use. This paper defines a kind of test criteria based on page coverage sequences only navigated by web application, including Page_Single, Page_Post, Page_Pre, Page_Seq2, Page_SeqK. The test criteria based on page coverage sequences made by interactions between web application and browser are being under consideration after that. In order to avoid ambiguity of natural language, these coverage criteria are depicted using Z formal language. The empirical result shows that the criteria complement traditional coverage and fault detection capability criteria.     

面向互联网应用的云操作系统的架构设计

云计算的核心理念是按需提供IT服务, 这对基础设施提供商带来巨大的影响. 介绍以中小企业为主要服务群体的云操作系统INACloud的架构设计, 并且综合考虑实际运维问题、自主创新和开源软件等因素以及面向互联网应用动态多变的资源需求, 重点探讨调度策略、监控设计和计费管理等方面.     

浅谈桥头地基如何应用土工经编格栅

桥头路基的质量要求比较高,如果路基与桥涵建筑物沉降不均匀而出现沉降差(错台),使高速行驶的车辆通过时发生震动、颠簸、跳车、噪声增大等情况。桥头跳车问题不但对行车安全和速度造成危害,而且会严重影响车辆及桥梁的使用寿命。目前该问题已引起广泛的注意。本文以此为目的,分析了土工经编格栅在桥头路基中的应用。     

浅谈杂质土路基的加固处理

以某工程为例简要阐述了杂质土路基采取灌浆加固处理方案.     

一种面向互联网应用的多路实时流媒体同步合成方案

针对互联网流视频协作直播应用,以多路实时流媒体应用系统为背景,提出了一种基于RTMP(real-time messaging protocol)协议的多路音视频实时同步合成方案。首先,在采集端以同一基准为多个数据流添加自定义的时间戳;其次,基于阈值同步多路数据流,并实现基于时域的自适应加权平均多路音频混合和基于像素域的多画面合成,生成一路音频流和视频流;最后,将生成的音频流和视频流同步复用,推流直播。该方案无需全网同步时钟与反馈机制,算法复杂度低,并有效解决了直播中网络延迟、抖动、时钟偏移、数据丢失等问题。试验表明,其可满足多路实时流媒体网络直播中的同步、合成及实时性需求。