Software Operational Profile Based Test Case Allocation Using Fuzzy Logic

Software operational profile (SOP) is used in software reliability prediction,software quality assessment,performance analysis of software,test case allocation,determination of"when to stop testing,"etc.Due to the limited data resources and large efforts required to collect and convert the gathered data into point estimates,reluctance is observed by the software professionals to develop the SOP.A framework is proposed to develop SOP using fuzzy logic,which requires usage data in the form of linguistics.The resulting profile is named fuzzy software operational profile (FSOP).Based on this work,this paper proposes a generalized approach for the allocation of test cases,in which occurrence probability of operations obtained from FSOP are combined with the criticality of the operations using fuzzy inference system (FIS).Traditional methods for the allocation of test cases do not consider the application in which software operates.This is intuitively incorrect.To solve this problem,allocation of test cases with respect to software application using the FIS model is also proposed in this paper.     

日本JCO临界事故的辐射监测

1999年 9月 3 0日 1 0 :3 5日本核燃料处理公司 ( JCO)的 3名工作人员在将约 1 6.6kg浓缩铀溶液直接倒入沉淀池内时引发临界事故。事故的核裂变总数为 2 .5× 1 0 1 8,释放出大量中子和 γ辐射 ,3名当事人都受到严重中子和 γ照射 ,表现出厌食、恶心、呕吐、腹泻等典型的急性辐射综合症。当天 1 5:0 0东海地方当局实施半径 3 50 m范围内 2 0 0人避迁撤离措施 ,1 0月 1日 6:0 0链式反应终止 ,1 0月 2日 1 8:3 0日本政府宣布解除对该地区的警戒。事故发生后日本有关部门和机构对事故处理、事故分析、应急监测、事故影响评价、公众沟通等方面做了大量工作。这次事故在国际核事故分级表上列为 4级 ,场外无明显放射性污染 ,临近公众受到轻微照射。本文介绍 JCO临界事故的事故序列、事故响应、事故监测和剂量估算。     

Identifying the critical risks in underground rail international construction joint ventures: Case study of Singapore

Since the 1980s, Singapore has experienced the widespread use of international construction joint ventures (ICJVs), which are associated with a variety of risks. This study aims to assess the risks associated with the underground rail ICJVs in Singapore. To achieve this objective, a comprehensive literature review was carried out and a questionnaire survey was conducted with 33 contractors. The survey results reported “disagreement on some conditions in contract” as the most critical risk. Although the risk criticalities of some risks significantly differed according to multiple company characteristics, there was strong agreement on the risk rankings. With the help of this study, ICJV partners can identify the most critical risks and thus develop mitigation measures. Also, the findings from this study provide a comprehensive picture of risks for the companies that intend to participate in ICJVs in Singapore.     

广州配电网故障停电事故的自组织临界特征

利用配电网可靠性的统计数据研究配电网停电事故的自组织临界(SOC)特性能为提高配电网运行水平、改善供电可靠性提供理论依据。因此,在广州市10 k V配电网可靠性统计数据的基础上,选取了故障停电事故的停电时户数和停电持续时间为分析对象;然后,利用最小二乘法,在双对数坐标系下,对分析对象的标度和频度的关系进行线性拟合,通过F检验,校核标度、频度的线性相关关系,初步验证了10 k V配电网故障停电事故的SOC特性;最后,给出了SOC特性对配电网运行的指导意义。     

蒙特卡罗临界计算粒子并行动态负载均衡调权算法研究

本文针对蒙特卡罗临界计算,提出了一种具有动态负载平衡能力的粒子权重调节算法。该算法在每次源迭代初始,将模拟粒子总权重均分到每个进程上,在保证每个进程本地权重恒定的前提下,分别调节不同进程的粒子出生权重,实现了源迭代过程中进程间计算的动态负载平衡。与Master Slave、Nearest Neighbor等算法进行比对,发现此算法加速效果更好。将此算法集成到JMCT程序中,通过BEAVRS基准题测试了并行效率,相对于128进程,4 800进程弱可扩和强可扩展并行效率分别可达92.54%和81.47%。     

临界实验装置水位外推达临界方法优化研究

带乏燃料的临界实验装置可用于开展乏燃料贮存相关的临界实验研究,考虑到其具有较高放射性,因此开展实验时最佳方法是水位外推达临界方法。目前该带乏燃料的临界实验装置尚未建成,遂使用与其堆芯结构、物理特性相似的铀棒栅轻水慢化临界实验装置开展水位外推达临界方法的模拟实验。在该实验中,由于水的屏蔽作用随水位上升不断加深导致无法得到正常的外推曲线。本文通过蒙特卡罗程序模拟外推过程,研究了中子源与探测器在不同的相对位置处中子计数率随水位变化的规律,给出了探测器与中子源的优化布置方案。此外,还提出一种以水位价值作为外推参数的外推方法,消除了水位高度外推时水位系数不均匀的影响,使得外推结果更准确。     

连通图临界度定义的注记

本文递归地定义了连通图的临界度,并证明了几个定理,揭示了连通图临界度的特殊性质,说明所给出的递归定义与常规定义之间的关系.     

5MW低功率堆物理启动

本文介绍5MW 低功率堆(5MW LPR)首次装料及首次临界试验。由于本堆使用有燃耗的燃料元件,铍作反射层,光激中子成为强的内中子源,其强度随着燃料元件装量的增加而增加。因此,装料时元件法外堆结果有较大的涨落,但整个装料过程是安全的。在次临界下,做了控制棒相对效率曲线,然后,提升控制棒,进行计数外推,达到首次临界。     

Objectivity Among Mentors.

After hearing two graduate students in experimental psychology extol learnedly a major theoretical position, the authors were disturbed by a phenomenon that has doubtlessly troubled other psychologists. They wonder why more or less equally intelligent and motivated students, though at different universities, adopt at least superficially but in most cases intrinsically different theoretical biases, each promoting and defending his own belief as though it were verily the most defensible and reasonable theoretical position? Are the various learning theories that different to justify enthusiastic and pious acceptance by comparably capable students? Do celebrated theorists promote their own views comprehensively and dramatically while presenting other views cursorily and sluggishly? Are graduate students really guileless and uncritical? They decry the failure in teaching objectivity in evaluating the numerous theories extant as a serious injustice to the student, who will probably be woefully lacking during later professional maturity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)