An Effective Long String Searching Algorithm towards Component Security Testing

In the execution of method invocation sequences to test component security,abnormal or normal information is generated and recorded in a monitor log. By searching abnormal information from monitor log,the exceptions that the component has can be determined. To facilitate the searching process,string searching methods could be employed. However,current approaches are not effective enough to search long pattern string. In order to mine the specific information with less number of matches,we proposed an improved Sunday string searching algorithm in this paper. Unlike Sunday algorithm which does not make use of the already matched characters,the proposed approach presents two ideas — utilizing and recycling these characters. We take advantage of all matched characters in main string,if they are still in the matchable interval compared with pattern string,to increase the distance that pattern string moves backwards. Experimental analysis shows that,compared to Sunday algorithm,our method could greatly reduce the matching times,if the scale of character set constituting both main string and pattern string is small,or if the length of pattern string is long. Also,the proposed approach can improve the search effectiveness for abnormal information in component security testing.

A fault injection model-oriented testing strategy for component security

A fault injection model-oriented testing strategy was proposed for detecting component vulnerabilities.A fault injection model was defined,and the faults were injected into the tested component based on the fault injection model to trigger security exceptions.The testing process could be recorded by the monitoring mechanism of the strategy,and the monitoring information was written into the security log.The component vulnerabilities could be detected by the detecting algorithm through analyzing the security log.Lastly,some experiments were done in an integration testing platform to verify the applicability of the strategy.The experimental results show that the strategy is effective and operable.The detecting rate is more than 90%for vulnerability components.

Components Qualification for the Safe Operation of Nuclear Power Plants

AREVA operates a world-wide unique thermal hydraulic platform to ensure high safety standards in the nuclear industries. This platform is operated as an accredited test and inspection body according to ISO 17025 and 17020 to grant a high and independently confmned quality standard. The accreditation also ensures the independency of the organization and confidentiality to the individual stakeholders, for example research centers, utilities, components suppliers, engineering companies and vendors. Especially for nuclear power plants, it is very relevant to consider that reliability depends on the integrity of its components during its life time-from design through construction, operation and maintenance. For example, a typical NPP （nuclear power plant） has 1,000 to 2,000 large valves and 7,500 to 12,500 small valves, of which about 200 to 400 are designated Safety Class 1. The qualification of these Safety Class 1 components is relevant for reactor new builds but also for installed plants. This paper explains newly established qualification tasks, the corresponding testing infrastructure, and the state of the art of testing technology. By way of example, the paper describes the program and possible sequence of qualifying NPP safety-related components.

An Improved String-Searching Algorithm and Its Application in Component Security Testing

Mass monitor logs are produced during the process of component security testing. In order to mine the explicit and implicit security exception information of the tested component, the log should be searched for keyword strings. However, existing string-searching algorithms are not very efficient or appropriate for the operation of searching monitor logs during component security testing. For mining abnormal information effectively in monitor logs, an improved string-searching algorithm is proposed. The main idea of this algorithm is to search for the first occurrence of a character in the main string. The character should be different and farther from the last character in the pattern string. With this algorithm, the backward moving distance of the pattern string will be increased and the matching time will be optimized. In the end, we conduct an experimental study based on our approach, the results of which show that the proposed algorithm finds strings in monitor logs 11.5% more efficiently than existing approaches.

测试程序集组件化设计研究与实现

针对自动测试系统设计过程中,测试程序存在的开发效率低、语义不统一、维护难度大,对开发人员技术水平要求较高,阻碍自动测试系统整体开发速度及推广应用等问题,文中开展测试程序集组件化设计研究,并通过软件设计实现相关功能,改变测试程序集的设计方式。首先,构建测试程序集设计所需资源库,动态识别提取资源库相关信息,并结构化表达;其次,对测试程序集内容要素进行分类,结合UI设计开发对应的组件,组件关联资源库结构化信息,实现拖拽组件、组件内容参数化设置的非编码设计方式以及自动生成源代码;最后,采用Python脚本语言与PyQT界面设计工具,结合测试程序集设计流程,开发相应的软件功能,将测试程序集设计界面呈现给设计师。实际使用证明,测试程序集设计软件操作简单,自动生成的源代码可被自动测试系统软件平台执行,提高自动测试系统的开发效率。

通用化CNI模块测试设备的设计与实现

随着通信导航识别(CNI)系统模块化设计越来越成熟、越来越复杂,传统模块检测设备已不能满足当前CNI模块的快速、通用化的测试需求,该文提出了一种通用化CNI模块测试设备的设计及实现。针对CNI系统的五大类十三种模块(天线接口模块、功放模块、接收模块、发射模块和电源模块)的硬件接口、软件接口、射频接口、时序逻辑和工作流程的测试需求,该文进行了统一的梳理和整合,采用综合化和组件化的设计思想来对模块测试设备进行设计和实现。使用结果表明,该测试设备在单个测试人员操作的情况下与传统的模块测试设备进行比较,能够更加快速、准确地完成测试任务,具有操作简单、可移植性强、通用性好、集成度高的优点,同时,相比于使用传统模块测试设备,通用化模块测试设备测试时间减少了51.8%、设备体积减小了88%、设备成本降低了58%,具有很好的工程意义和推广前景。

Fiducial generalized p-values for testing zero-variance components in linear mixed-effects models

Linear mixed-effects models are widely used in analysis of longitudinal data. However, testing for zero-variance components of random effects has not been well-resolved in statistical literature, although some likelihood-based procedures have been proposed and studied. In this article, we propose a generalized p-value based method in coupling with fiducial inference to tackle this problem. The proposed method is also applied to test linearity of the nonparametric functions in additive models. We provide theoretical justifications and develop an implementation algorithm for the proposed method. We evaluate its finite-sample performance and compare it with that of the restricted likelihood ratio test via simulation experiments. We illustrate the proposed approach using an application from a nutritional study.

一种驻留于航电产品的通用测试软件架构设计

为提高航电测试软件的可移植性及复用能力,缩短软件开发周期,参照通用开放式软件架构FACE(Future Airborne Capability Environment)标准,基于将可移植组件通过标准接口快速接入通用软件框架的思想,设计了分层解耦的通用测试软件架构。将测试软件划分为平台适配组件、基础服务组件、测试指令通信组件以及测试用例组件。在此架构基础上,设计了统一的测试软件通信规约,定义了标准的接口规范。基于此架构开发的测试软件不仅可满足航电产品的测试需求,而且可以实现不同项目之间测试用例的快速接入和裁剪。所设计的通用测试软件架构改变了传统一型产品定制开发一个测试软件的现状,可满足航电测试软件通用性、易用性和可扩展性等要求,其在航电产品测试领域的推广可有效提高测试软件开发效率,减少人力资源成本。

Surface wave transducer for ultrasonic nondestructive testing of polymer components

In the point of application to ultrasonic nondestructive testing of surface stress and defect in polymer component, the oblique suxface wave transducer is investigated on its acoustic property and especially the mechanism of acoustic attenuation of acoustic entrant material inside the transducer. A new kind of room temperature vulcanized silicone elastomer as wedge material, in which ultrasound can propagate in very low speed with weak attenuation, is developed through a great deal of trials. The corresponding ultrasonic transducer is also designed for further researches and application to detect surface stress and surface crack in aerospace transparent component.

A Method of Minimum Reusability Estimation for Automated Software Testing

Through reusing software test components, automated software testing generally costs less than manual software testing. There has been much research on how to develop the reusable test components, but few fall on how to estimate the reusability of test conlponents for automated testing. The purpose of this paper is to present a method of minimum reusability estimation for automated testing based on the return on investment （ROI） model. Minimum reusability is a benchmark for the whole automated testing process. If the reusability in one test execution is less than the minimum reusability, some new strategies must be adopted ill the next test execution to increase the reusability. Only by this way, we can reduce unnecessary costs and finally get a return on the investment of automated testing.