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This paper investigates two relatively new measures of retrieval effectiveness in relation to the problem of incomplete relevance data. The measures, Bpref and RankEff, which do not take into account documents that have not been relevance judged, are compared theoretically and experimentally. The experimental comparisons involve a third measure, the well-known mean uninterpolated average precision. The results indicate that RankEff is the most stable of the three measures when the amount of relevance data is reduced, with respect to system ranking and absolute values. In addition, RankEff has the lowest error-rate. 相似文献
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RSS: A framework enabling ranked search on the semantic web 总被引：1，自引：0，他引：1
The semantic web not only contains resources but also includes the heterogeneous relationships among them, which is sharply distinguished from the current web. As the growth of the semantic web, specialized search techniques are of significance. In this paper, we present RSS—a framework for enabling ranked semantic search on the semantic web. In this framework, the heterogeneity of relationships is fully exploited to determine the global importance of resources. In addition, the search results can be greatly expanded with entities most semantically related to the query, thus able to provide users with properly ordered semantic search results by combining global ranking values and the relevance between the resources and the query. The proposed semantic search model which supports inference is very different from traditional keyword-based search methods. Moreover, RSS also distinguishes from many current methods of accessing the semantic web data in that it applies novel ranking strategies to prevent returning search results in disorder. The experimental results show that the framework is feasible and can produce better ordering of semantic search results than directly applying the standard PageRank algorithm on the semantic web. 相似文献
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首先将广义准循环码的概念推广到环Z2k1+上,然后仿照Fq上广义准循环码的生成元的形式,给出了环Z2k1+上的1-生成元广义准循环码C的生成元的具体形式,最后通过给出C为Z2k1+自由模的充分条件,得出C为自由模时码C的维数及最小距离. 相似文献
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宋代的知县、县令,也有兼一县兵马的职责。朝官知县兼领一县兵马,被称为兵马都监;京官知县和幕职州县官县令兼领一县兵马,被称为兵马都监;畿县知县兼领一县兵马,称为签书兵马司公事。宋代知县、县令兼领兵马,一是镇压民间的反抗活动,二是抵制异族的进攻。宋代的知县、县令始于宋初;神宗革新,实行将兵法,专门别置教官训练军队,罢黜知县、县令兼领一县兵马之权;到南宋恢复知县、县令兼兵权,知县、县令带兵制几经变化…… 相似文献
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文章根据目前普通高校武术课程在教学过程中存在的问题和国家的相关政策要求,对普通高校武术段位制课程体系进行建构,达到弘扬武术文化、提高学生身体素质和促进普通高校武术课程教学改革的目的。 相似文献
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武术段位制实行18年以来,逐渐走入了中小学的体育教学中,段位制的引入为中小学武术教学指明了方向,加快了中华武术的传播,促进了武术的技术传播,传承了武术文化,弘扬了传统武德,也壮大了武术事业的发展。文章主要从这四个方面介绍武术段位制引入中小学教学对武术传播的影响。 相似文献
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《Journal of Informetrics》2014,8(2):340-348
In the present paper the Percentage Rank Position (PRP) index concluding from the principle of Similar Distribution of Information Impact in different fields of science (Vinkler, 2013), is suggested to assess journals in different research fields comparatively. The publications in the journals dedicated to a field are ranked by citation frequency, and the PRP-index of the papers in the elite set of the field is calculated. The PRP-index relates the citation rank number of the paper to the total number of papers in the corresponding set. The sum of the PRP-index of the elite papers in a journal, PRP(j,F) may represent the eminence of the journal in the field. The non-parametric and non-dimensional PRP(j,F) index of journals is believed to be comparable across fields. 相似文献
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本文随机选取南昌市7条公交线路对其服务质量满意度进行调查研究,运用独立样本Kruskal-Wallis检验方法判断公交服务质量的差异显著情况和计算服务质量的平均秩。研究结果表明:不同公交线路的服务质量满意度感知情况存在显著性差异,同时有无空调、停站数量、首末班时间安排、发车频率以及换乘便利情况均是影响乘客满意度的重要因素。通过实证分析,为进一步改善公交服务质量、提高乘客满意度提供理论依据。 相似文献
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蹇小平 《常熟理工学院学报》2002,16(4):14-16
在Hilbert空间H和K中，给出了B(H)到B(K)的保谱反乘法映射ф的形式为ф（T）=AT^*A^-1，其中A∈B(H，K)。 相似文献