共查询到19条相似文献，搜索用时 453 毫秒
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吴英毅 《中国科学院研究生院学报》2008,25(5):585-591
HCMU是一种在Riemann面上带奇点的extremal度量．在面积和Calabi能量有界的情况下, HCMU的Gauss曲率是Riemann面上的连续函数．本文得到一个在球面上没有Gauss曲率鞍点的HCMU的明显表达式,并进一步证明了在球面或环面上HCMU的Gauss曲率光滑的充要条件是度量的所有奇点的角度都是整数． 相似文献
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Unit是c#中的一种结构类型,也是c#中的-种度量类型,该文从两个方面详细介绍了unit结构的使用,一个是通过new关键字使用Unit结构,另一个是使用Unit静态方法设置. 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
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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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在经典的欧氏空间的条件下构造微分结构,运用Rademacher定理是一个很好的方法。如何在一般的度量空间建立微分结构,是人们关注的问题。本文研究了对度量空间的Lipschitz函数进行微分,研究这个函数类在局部的微分结构,自然的定义了一个Sobolev空间。对在度量空间上建立微分结构有一定的帮助。 相似文献
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给出C-{0,1}上Poincaré度量边界估计的一个新方法.该方法简单、直接,不涉及Ahlfors关于超双曲度量的Schwarz引理,也不涉及调和分析和模函数的内容. 相似文献
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IT治理的研究已从定性层面的研究逐渐进入到定量层面的研究阶段,IT治理的定量评价需要可操作的度量模型进行支持.企业通过IT过程来管理、组织企业中的IT资源以及IT活动.本文提出基于IT过程来构建企业IT治理的度量模型.针对IT过程比较复杂、过程信息模糊等难题,本文将COBIT的IT过程模型和软件工程学中的GQM度量模型相结合,针对企业IT治理评价中的度量需求,加以改进,提出了一种由绩效目标和控制目标共同驱动的ITG-PCGQIM度量模型,并给出了该模型的形式化描述和在该模型基础上开发的度量支持系统. 相似文献
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随着各种各样移动设备的普及,轨迹隐私保护问题变得日益严峻,作为轨迹隐私保护的一个方向,国内外开始慢慢建立起一些较为成熟的度量机制,常见的有基于k-匿名保护机制的隐私度量方法、基于跟踪的度量方法、针对特定匿名系统的轨迹隐私度量方法等。文章在现有研究的基础上构建了了一种基于假数据轨迹隐私保护技术的隐私度量标准,从发布假轨迹上点之间的关联性、发布数据所包含信息的精确度以及攻击者所拥有背景知识多少三个方面进行轨迹隐私保护度的全面度量。 相似文献
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Mehmet Ozen 《Journal of The Franklin Institute》2007,344(5):790-799
We investigate the structure of codes over Galois rings with respect to the Rosenbloom-Tsfasman (shortly RT) metric. We define a standard form generator matrix and show how we can determine the minimum distance of a code by taking advantage of its standard form. We compute the RT-weights of a linear code given with a generator matrix in standard form. We define maximum distance rank (shortly MDR) codes with respect to this metric and give the weights of the codewords of an MDR code. Finally, we give a decoding technique for codes over Galois rings with respect to the RT metric. 相似文献
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In collaborative filtering recommender systems recommendations can be made to groups of users. There are four basic stages in the collaborative filtering algorithms where the group’s users’ data can be aggregated to the data of the group of users: similarity metric, establishing the neighborhood, prediction phase, determination of recommended items. In this paper we perform aggregation experiments in each of the four stages and two fundamental conclusions are reached: (1) the system accuracy does not vary significantly according to the stage where the aggregation is performed, (2) the system performance improves notably when the aggregation is performed in an earlier stage of the collaborative filtering process. This paper provides a group recommendation similarity metric and demonstrates the convenience of tackling the aggregation of the group’s users in the actual similarity metric of the collaborative filtering process. 相似文献
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Puja kumari Jha Nirupama Sharma Juhee Chandra Rachna Agarwal 《Indian journal of clinical biochemistry : IJCB》2021,36(3):337
Variability in analytical performance of some analyte indicated the need of evaluation of quality plan of our laboratory. We tried to put the same degree of effort into our quality metrics as we put into the laboratory processes themselves. Application of six sigma methodologies improve the quality by focusing on the root causes of the problems in performance and analyzing by flowcharts, fishbone diagrams and other quality tools. Sigma metric was calculated for laboratory parameters for a period of 8 months during 2018–19. The analytes with poor sigma metric were free Thyroxine (FT3, FT4), Sodium, Calcium and Magnesium. Sigma metric of free Thyroxine (FT3, FT4), Sodium, Calcium and Magnesium were below 3. A road map for process improvement was designed with DMAIC (Define-Measure-Analyze-Improve-Control) model to solve the issue. Possible causes for low analytical performance of the particular analytes were depicted in Fishbone diagram. The Fishbone analysis identified the water quality issues with electrolyte analysis while high ambient temperature was culprit for poor assay performance of free Thyroxine. Sigma metric of the analytical performance was assessed once again after root cause analysis. Sigmametric showed marked improvement in control phase. Identification of problems led to reduction in non value added work leading to adequate resource utilization by addressing the priority issue. Therefore, DMAIC tool with Fish bone model analysis can be recommended as a well suited method for troubleshooting in poor performance of laboratory parameter. 相似文献
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利用变分法导出量子力学系统中一类最优控制问题的方程组，并使用具有最优搜索步长的开关变尺度法对最优控制问题进行数值迭代求解，最后在自旋1/2粒子上进行了系统仿真实验，验证了本文方法的有效性，同时对性能指标中参数的不同选择对整个最优控制效果影响的一般规律进行了分析。 相似文献
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科学数据使用统计是科学数据使用计量的重要构成,是科研学术评价的重要参考依据。对比三类数据使用计量的效果及应用难度,文章认为使用统计计量有良好的可信度和可操作性。在梳理研究现状基础上,文章分析数据使用统计的利益相关方,结合数据自身特点,总结流程,并重点阐述数据收集、规范、清洗、报告等关键流程问题,最后提出思考与建议。 相似文献
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英国公布的首份年度创新报告反映出英国在建设创新国家战略的实施过程中已初步确立了国家创新表现的测度体系.年度创新报告的公布可以看成是英国政府在国家层面上对创新战略管理的"创新".本文通过对英国年度创新报告的分析,探讨了英国创新测度体系的形成、内容和测度指标的相关情况并结合我国建设创新型国家战略实施过程的实际情况,就开展创新型国家建设进程监测与评价,建立我国创新测度体系并开展标准的创新普查活动提出了相关建议. 相似文献
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《Information processing & management》2023,60(1):103109
With an increase in the number of data instances, data processing operations (e.g. clustering) requires an increasing amount of computational resources, and it is often the case that for considerably large datasets such operations cannot be executed on a single workstation. This requires the use of a server computer for carrying out the operations. However, to ensure privacy of the shared data, a privacy preserving data processing workflow involves applying an encoding transformation on the set of data points prior to applying the computation. This encoding should ideally cater to two objectives—first, it should be difficult to reconstruct the data, second, the results of the operation executed on the encoded space should be as close as possible to the results of the same operation executed on the original data. While standard encoding mechanisms, such as locality sensitive hashing, caters to the first objective, the second objective may not always be adequately satisfied.In this paper, we specifically focus on ‘clustering’ as the data processing operation. We apply a deep metric learning approach to learn a parameterized encoding transformation function with an objective to maximize the alignment of the clusters in the encoded space to those in the original data. We conduct experimentation on four standard benchmark datasets, particularly MNIST, Fashion-MNIST (each dataset contains 70K grayscale images), CIFAR-10 consisting of 60K color images and 20-Newsgroups containing 18K news articles. Our experiments demonstrate that the proposed method yields better clusters in comparison to approaches where the encoding process is agnostic of the clustering objective. 相似文献
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首先简单介绍了对于有理数域上光滑射影曲线的Beilinson猜想,然后应用椭圆簇的知识指出了存在于费玛曲线K2群中的一个元素,最后在费玛曲线X3这个特殊情形下,将其L-函数与Eisenstein-Kronecker-Lerch级数明确地联系起来,从而验证了其L-函数满足的函数方程,以及它能在复平面上解析延拓的事实. 相似文献
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本文以ISIWebofScience数据平台中所收录的竞争情报研究文献作为分析样本,利用CiteSpace知识计量工具,绘制了国际竞争情报研究的科学知识图谱——知识演化图,通过对竞争情报研究的历史脉络和研究热点的分析,发现国际竞争情报研究内容广泛、方法新颖、紧跟时代,并以网络竞争情报、跨国企业竞争情报与竞争情报系统为主要研究对象。 相似文献