排序方式： 共有117条查询结果，搜索用时 343 毫秒
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This paper examines the factors affecting the performance of global query expansion based on term co-occurrence data and suggests a way to maximize the retrieval effectiveness. Major parameters to be optimized through experiments are term similarity measure and the weighting scheme of additional terms. The evaluation of four similarity measures tested in query expansion reveal that mutual information and Yule's Y, which emphasize low frequency terms, achieve better performance than cosine and Jaccard coefficients that have the reverse tendency. In the evaluation of three weighting schemes, similarity weight performs well only with short queries, whereas fixed weights of approximately 0.5 and similarity rank weights were effective with queries of any length. Furthermore, the optimal similarity rank weight achieving the best overall performance seems to be the least affected by test collections and the number of additional terms. For the efficiency of retrieval, the number of additional terms needs not exceed 70 in our test collections, but the optimal number may vary according to the characteristics of the similarity measure employed. 相似文献
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张扬汉 《喀什师范学院学报》2011,32(3):47-49
在描述Vague之间的相似度量与加权相似度量方法的基础上,提出了方案评价所采用的评价指标体系,形成了一套喷灌设计方案评价新方法.在园林喷灌设计方案评价中,Vague集之间的相似度量是评价设计方案接近期望方案（理想方案）的度量,相似度量值越大,设计方案接近期望方案越好.通过实例阐明Vague集之间的相似度量在喷灌设计方案评价中的可行性,方案评价取得了较为满意的结果. 相似文献
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分析了图书馆员工作的实际情况,建立了优秀图书馆员的评价指标体系.采用层次分析法（AHP）和逼近理想解排序法（TOPSIS）相结合,提出了一种优秀图书馆员评价与选择模型,并通过实例验证该方法的可行性. 相似文献
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为建立知识管理系统的自学习与自组织机制,本文将基于案例推理的技术思想引入知识管理自学习子系统,对知识管理自学习案例的平行结构体方面相似度进行系统而深入地研究。首先,论文对相关文献进行述评,阐明了本文研究的出发点,诠释了知识管理自学习案例平行结构体方面的内涵及其特征;继而,分七种情况深入讨论了平行结构体方面维度相似度的计算方法,并在此基础上提出了方面相似度的计算策略;最后,通过算例分析了相关技术策略与实施细节。 相似文献
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陈玉秀 《贵阳师范高等专科学校学报》2011,(2):99-101
隐喻是一种重要的认知模式,是从一个范畴域向另一个范畴域的结构映射。相似性是隐喻的基础,也是隐喻区别于其他相关语言用法的重要条件。隐喻相似性依赖于客观世界和主观认知之间的互相作用,是可以创造的。相似性实际上仅表现于两个事物之间某一个方面或某一个点,是潜在的,是人类在这两个具有差异性的事物中突显其相似面或相似点的结果。 相似文献
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徐健 《现代图书情报技术》2011,(9)
针对现有基于语境特征的术语相似度算法在语境模板生成和匹配过程中存在的不足,提出基于术语的句法依赖关系自动构造术语语境模板,进而通过语境模板匹配计算术语相似度的方法。该方法既能减少语境模板的生成和匹配困难,又将术语语境特征较好地保留在模板中。针对新方法提出具体的实现步骤,并选取基因工程领域实验数据对新方法和现有典型方法进行对比评测。实验证明,新方法在计算效果方面具有明显提升。 相似文献
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Eduardo N. Borges Moisés G. de Carvalho Renata Galante Marcos André Gonçalves Alberto H.F. Laender 《Information processing & management》2011
Digital libraries of scientific articles contain collections of digital objects that are usually described by bibliographic metadata records. These records can be acquired from different sources and be represented using several metadata standards. These metadata standards may be heterogeneous in both, content and structure. All of this implies that many records may be duplicated in the repository, thus affecting the quality of services, such as searching and browsing. In this article we present an approach that identifies duplicated bibliographic metadata records in an efficient and effective way. We propose similarity functions especially designed for the digital library domain and experimentally evaluate them. Our results show that the proposed functions improve the quality of metadata deduplication up to 188% compared to four different baselines. We also show that our approach achieves statistical equivalent results when compared to a state-of-the-art method for replica identification based on genetic programming, without the burden and cost of any training process. 相似文献
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针时“编译原理”课程教学中缺乏实践的问题,设计了一个实践强化的综合应用型教学案例。该案例以编译原理课程为中心,综合运用了多门计算机专业课程的相关知识,并具有相似性检测的功能,能对学生提交的程序设计类作业进行相似性检洲,以发现学生作业的原创性。学生通过对给出知识点的粗合和扩展,完成案例的设计和程序实现。弥补了课程教学中存在的不足,并具有一定的实用性。 相似文献