共查询到20条相似文献，搜索用时 78 毫秒
1.
《科技通报》2015,(10)
在云计算模型下进行软件可靠度衡量可以提高软件的扩展能力,增强软件的可靠性,延长软件寿命。传统的软件可靠度衡量算法采用重复博弈调度算法,不能有效实现软件可靠性的非线性动态权衡。提出一种基于云模型三元组特征分析的软件可靠度非线性动态衡量算法。构建软件衡量顺序、衡量时间和衡量目标矩阵,每一行元素都是一个软件的可靠性衡量逆向云发生器数据,根据变异概率,计算云模型下软件可靠度衡量过程中的变异点,得到软件可靠性动态衡量的输出,采用模糊数学和概率统计理论,描述云模型的定量特性,得到期望、熵、超熵三个动态属性,称为软件可靠度云的数字特征。通过计算大量的样本进行抽样统计,判断可靠度空间格点是否有链节点,在云模型下,得到可靠性合并云综合度量云输出。仿真结果表明,该模型实现软件可靠度非线性动态衡量,生成的云模型能更进一步反映度量的真实性,解决了可信软件可靠性定性评估的问题。 相似文献
2.
针对复杂网络环境下软件质量测评技术的特点,基于最新计算机网络软件质量管理理论,提出MOOD度量方法对软件质量进行体系测评,定义了六指标体系算法作为软件评估度量体系,首次对Mc-Call模型、Boehm模型和ISO/IEC 9126模型3种典型的计算机软件质量优化模型进行系统结构拓扑和测评误差分析,并提出采用WAF尺度因子对结果拓扑进行评价。仿真结果表明,3种优化模型误差率都得到有效降低,趋于0.01,比传统度量方法误差降低23%。研究成果为软件质量管理提供了有效的理论依据。 相似文献
3.
软件规模及其复杂性的不断增大,致使传统的度量方法不能满足开发人员对软件质量的控制;为了解决这个问题,开发人员需要有新的方法来测量软件的复杂度,从而控制软件质量,优化软件结构。复杂网络的研究为软件开发人员在系统层面上度量软件的复杂性提供了新的认识和理论支持;讨论了基于复杂网络的软件静态结构和动态结构的复杂性度量方法及其对当今大规模软件开发的指导意义;给出了一个软件结构复杂性度量的研究工具。 相似文献
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基于Reboot构件质量和软件质量标准ISO/IEC 9126:《软件工程产品质量》,探讨了软件构件的质量度量问题,提出了较完整的软件构件质量模型,为度量软件质量提供了新的方法,重点探讨如何将构件的检索与构件复用相结合。 相似文献
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基于Reboot构件质量和软件质量标准ISO/IEC 9126：《软件工程产品质量》,探讨了软件构件的质量度量问题,提出了较完整的软件构件质量模型,为度量软件质量提供了新的方法,重点探讨如何将构件的检索与构件复用相结合。 相似文献
7.
《科技通报》2015,(12)
对软件可靠度的控制设计可以提高软件的可移植性和稳定性,软件的可靠度因素受到多维非线性参量因素的限制,难以对软件可靠度控制模型进行有效的数学建模,传统的控制方法采用非线性动态衡量算法实现软件可靠度控制,控制算法的渐进收敛性不好,不能准确实现软件可靠性的动态评估。提出一种基于Leslie-Gower模型的软件可靠度二维渐进控制模型。构建了软件可靠度控制的Les-lie-Gower模型,分析软件可靠度控制的参量,基于遗传适应度博弈算法,在Leslie-Gower模型下,实现对软件可靠度的二维渐进控制算法控制,提高了软件可靠度的控制收敛性能。仿真结果表明,该算法能有效提高软件的执行和移植效率,可靠度控制的收敛性和鲁棒性较好。 相似文献
8.
软件错误早期预测能够对软件质量控制起到很好的指导作用,同时也降低了软件的开发代价。目前虽然有很多进行软件错误早期预测的研究和方法,但都具有一定的片面性。提出利用需求度量结合静态代码度量的混合度量方法对软件错误进行早期预测,通过NASA的3个数据集进行了测试,并对不同的度量方法在该数据集上产生的结果进行了比较。 相似文献
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软件度量是软件质量与控制的基础。自20世纪70年代以来,软件度量方法的研究得到了长足的发展,本文分析了软件度量理论的发展及其在先进国家的研究现状,对软件度量方法工具以及相关的研究进展给出了一个比较全面的阐述。 相似文献
10.
针对复杂网络环境不同网络交易的特点,提出了采用变权重云模型网络拓扑理论对网上交易信任度及信任度变化量化评估方法。首先构建了基于云模型的信任度评估模型的总体结构,研究标准信任云生成器网络拓扑算法,通过调整网络拓扑权重向量,提出使用标准信任云生成器系统迭代的信息相似度为定量评估参数,设置信任云信息点的响应的频率计数器从而有效降低迭代算法的运算成本,构建标准信任云逆向生成器对网上交易信息进行完整逆向跟踪评价体系。结合淘宝网真实数据进行实验仿真,仿真结果表明该算法能更真实定量地反映商家信任度,有效降低复杂虚拟的网络交易所带来的交易风险,一定程度上完善了信任度评估机制。 相似文献
11.
Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
12.
A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
13.
Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
16.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献
17.
Milton Mueller 《The Information Society》2001,17(3):151-163
Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP. 相似文献
18.
Prof. Raymond C.K. Chen a neuropsychologist with the CAS Institute of Psychology has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.…… 《中国科学院院刊(英文版)》2008,22(1):15-15
Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology. 相似文献
19.
Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
20.
《中国科学院院刊(英文版)》2014,(3)
<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence 相似文献