排序方式: 共有69条查询结果,搜索用时 234 毫秒
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一种基于数据流分析的程序定义域自动确定方法 总被引:3,自引:1,他引:2
程序定义域的确定有利于指导测试用例的选取,虽然程序规范规定了输入变量的定义域,但程序实现本身也定义了其定义域,如果二者不能完全重合,那么某些软件故障就可诊断出来,文中提出玫种基于数据流分析的程序定义域自动确定方法,通过对原程序进行数据流分析和相关性分析,求取输入变量的定义域,采用程序抽取的程序定义域自动确定方法,通过对源程序进行数据流分析和相关性分析,求取输入变量的定义域,采用程序抽取技术,将与输入变量无关的语句和函数剔除,简化了源程序,提高了分析效率,采用动态模拟技术,实现了特殊情形下输入变量定义域的确定,实验证明,该方法是行之有效的。 相似文献
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With the popularization of network applications and multiprocessor systems,dependability of systems has drawn considerable attention.This paper presents a new technique of node grouping for system-level fault diagnosis to simplify the complexity of large system diagnosis.The technique transforms a complicated system to a group network,where each group may consist of many nodes that are either fault-free or faulty.It is proven that the transformation leads to a unique group network to ease system diagnosis.Then it studies systematically one-step t-faults diagnosis problem based on node groupling by means of the concept of independent point sets and gives a simple sufficient and necessary condition.The paper presents a diagnosis procedure for t-diagnosable systems.furthermore,an efficient probabilistic diagnosis algorithm for practical applications is proposed based on the belief that most of the nodes in a system are fault-free.The result of software simulation shows that the probabilistic diagnoisis provides high probability of correct diagnosis and low diagnosis cost,is suitable for systems of any kind of topology. 相似文献
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IS-P2P:一种基于索引的结构化P2P网络模型 总被引:20,自引:0,他引:20
在分析无结构与有结构P2P网络结构的基础上,提出了一种新的基于索引的有结构P2P网络模型IS-P2P(Index-based Structured P2P Networks).IS-P2P网络采用两层混合结构,上层由比较稳定的索引节点组成有结构索引网络,使用文档路由搜索机制,提供资源的发布和查找功能.下层由普通节点组成分布式网络.IS-P2P模型充分利用P2P网络中节点的性能差异,具有高效的查找性能,且能适应P2P网络高度动态性.进一步计算IS-P2P模型中索引网络路由性能、查询处理速度、索引节点索引数据库大小以及索引节点转发查询消息代价表明,IS-P2P具有良好的性能. 相似文献
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基于谓词切片的字符串测试数据自动生成 总被引:3,自引:0,他引:3
字符串谓词使用相当普遍,如何实现字符串测试数据的自动生成是一个有待解决的问题,针对字符串谓词,讨论了路径Path上给定谓词的谓词切片的动态生成算法,以及基于谓词切片的字符串测试数据自动生成方法,并给出了字符串间距离的定义,利用程序DUC(Definithon-Use-Control)表达式,构造谓词的谓词切片,对任意的输入,通过执行谓词切片,获取谓词中变量的当前值,进而对谓词中变量的每一字符进行分支函数极小化,动态生成给定字符串谓词边界的ON-OFF测试点,实验表明,该方法是行之有效的。 相似文献
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The monotonic increasing relationship between average powers of CMOS VLSI circuits with and without delay and its applications 总被引:4,自引:0,他引:4
The authors theoretically describe the monotonic increasing relationship between average powers of a CMOS VLSI circuit with and without delay. The power of an ideal circuit without delay, which can be fast computed, has been used as the evaluation criterion for the power of a practical circuit with delay, which needs more computing time, in such fields as fast estimation for the average power and the maximum power, and fast optimization for the low test power. The authors propose a novel simulation approach that uses delay-free power to compact a long input vector pair sequence into a short sequence and then, uses the compacted one to fast simulate the average (or maximum) power for a CMOS circuit. In comparison with the traditional simulation approach that uses an un-compacted input sequence to simulate the average (or maximum) power, experiment results demonstrate that in the field of fast estimation for the average power, the present approach can be 6-10 times faster without significant loss in accur 相似文献
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长期的流量测量数据非常珍贵,因为通过对这些长期的流量数据进行分析,不但能发现Internet和运行于其上的各种网络应用如何在演变,更重要的是还可发现其中不变的规律。提出了网络监测平台的流量数据多级存储系统设计,并根据高速网络流量的重尾分布特性,采用合理的流数据存储策略,可大幅度减少要存储的数据量,同时又保留了必要的网络信息,适应于不同精度的测量需求并兼顾了成本、性能和效率。 相似文献
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序言微电子技术是计算机技术发展的基础。集成电路的测试是微电子技术的重要组成部分,主要用于三方面: 1.设计验证。设计一个复杂的电路固然困难,验证你的设计是否正确无误也是很困难的。制造样机,作试验的办法,既费钱,又费时,对大规模集成电路的设计,用这种办法是不可想像的。用计算机模拟的办法,虽然现在还在用,但常被认为不是最有效的。如果不做设计验证就投产,一旦设计有错误,就会造成极大的浪费。 2.产品检验。生产集成电路的厂家必须 相似文献