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This paper addresses the problem of how to rank retrieval systems without the need for human relevance judgments, which are very resource intensive to obtain. Using TREC 3, 6, 7 and 8 data, it is shown how the overlap structure between the search results of multiple systems can be used to infer relative performance differences. In particular, the overlap structures for random groupings of five systems are computed, so that each system is selected an equal number of times. It is shown that the average percentage of a system’s documents that are only found by it and no other systems is strongly and negatively correlated with its retrieval performance effectiveness, such as its mean average precision or precision at 1000. The presented method uses the degree of consensus or agreement a retrieval system can generate to infer its quality. This paper also addresses the question of how many documents in a ranked list need to be examined to be able to rank the systems. It is shown that the overlap structure of the top 50 documents can be used to rank the systems, often producing the best results. The presented method significantly improves upon previous attempts to rank retrieval systems without the need for human relevance judgments. This “structure of overlap” method can be of value to communities that need to identify the best experts or rank them, but do not have the resources to evaluate the experts’ recommendations, since it does not require knowledge about the domain being searched or the information being requested. 相似文献
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为了满足本科生毕业设计题目的双向选择性,解决人工分配与管理实现繁琐的难题,设计开发了基于Web的毕业设计双向选题系统。并基于B/S模式下的分布式结构,提出了切实可行的解决方案,按用户至上的原则,采用结构化、模块化、自顶向下地对系统进行设计的方法,实现了毕业设计题目网上的双向自动选择功能,提高了本科生毕业设计的信息化和网络化管理水平。应用结果表明系统运行安全可靠,功能齐全,可以满足高校本科生毕业设计选题的管理要求。 相似文献
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不同的产业集群发展状况不一致,企业在加入产业集群时,应该进行细致的分析。从生态学角度确定产业集群的7个数量特征,并运用因子分析方法建立企业选择产业集群的模型,最后根据不同因子的得分情况,选择了适合企业自身发展需要的产业集群。 相似文献
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中小企业技术来源的选择——基于浙江省中小企业的实证研究 总被引:3,自引:0,他引:3
提出一个技术来源选择的基本架构,描述技术来源选择、技术能力及技术类别间的相互影响关系。通过对浙江省148家中小企业的实证研究,表明技术能力和技术类别是影响技术来源选择的关键因素;企业内部自主研发要求企业具有相对较高水平的技术能力,而外部购买和联合研发则没有此要求;外部购买与技术类别密切相关而与企业的技术能力水平关系不大。 相似文献
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政策目标得以实现,需要一个与社会情境、制度系统与群体心理相契合的政策工具。政策工具的选择对于政策的平稳运行,以及政策的成本-收益分配具有重要作用。不同的政策工具选择模式会造成群体心理与行为的不同表现形式,如顺从与从众现象等。沮丧模式是政策工具选择失败带来的一种典型的群体心理行为的异常表现。 相似文献
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传统的大数据中价值信息提取方法采用基于模糊学习理论的数据融合处理方法,将预定学习序列输入神经网络,通过模糊启发,对预定序列进行多模型映射,此方法模型复杂,且启发率低。提出一种大数据子集特征遗忘启发的价值信息提取方法,对大数据进行非线性映射归一化,使每个子集实现并行运算,通过混沌方法提取子集特征,并建立混沌模型下的子集特征遗忘启发链,针对不同子集中的价值信息,依据遗忘启发链实现启发,提取价值信息。采用一组大数据下的伪随机价值信息进行提取测试,仿真实验表明,本文价值信息提取方法的提取率达到了98%,对于大数据下的价值信息提取具有很好的指导意义。 相似文献
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《International Journal of Information Management》2016,36(1):126-141
Workflow management systems coordinate and allocate work through the various stages of executing business processes. The benefits of such systems appear pervasive, but no hard data is available that confirms that their implementation improves organizational performance. In part, this is due to the difficulty of measuring the effects of enterprise-wide initiatives in general. In this paper, the results are presented of a longitudinal, multi-case study into the effectiveness of workflow management technology. The study builds on a novel methodology that combines field work and computer simulations. Through its application, the contribution of this technology to conduct business processes faster and with less effort could be quantitatively assessed. Surprisingly, only a fraction of the projects that were followed in this longitudinal study led to a fully operational implementation of a workflow management system at all. Even so, in most of the projects where such a system was introduced this resulted in substantial improvements. We present success and fail factors for the implementation of this technology within organizations, which we inferred from a follow-up analysis. The novel methodology presented in this paper is thought to be of value to track the performance effects of introducing other technologies or organization concepts as well. 相似文献
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本文阐述了Civil 3D及Map 3D在山区厂址选择工作中的优势,并结合工程实例,介绍了Civil 3D及Map 3D在厂址选择中的主要工作流程。 相似文献
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DSP Builder在通信仿真教学中的应用 总被引:1,自引:0,他引:1
文章介绍了Matlab/Simulink/DSP Builder软件的使用方法。结合2FSK数字调制系统的设计与仿真,阐述了DSP Builder在通信仿真教学中的应用。 相似文献
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In this paper, an efficient technique based on clonal selection algorithm (CLONALG) for linear antenna array pattern synthesis with null steering by controlling only the element excitation phases is presented. The CLONALG is an evolutionary computation method inspired by the clonal selection principle of human immune system. To show the versatility and flexibility of the proposed CLONALG, some examples of Chebyshev array pattern with the imposed single, multiple and broad nulls are given. The sensitivity of the nulling patterns due to small variations of the element phases is also investigated. 相似文献
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竞争与合作是企业知识联盟的最佳行为模式 总被引:7,自引:0,他引:7
本文论述了知识联盟的合作原理 ,用经济学的原理分析了知识联盟的竞争与合作 ,提出企业知识联盟的私人利益与共同利益的概念 ,私人利益与共同利益之比的大小决定了企业知识联盟的行为模式 ,竞争与合作是企业知识联盟的最佳行为模式 相似文献
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根据信号与系统课程特点以及教学过程中存在的问题,本文提出将仿真实验融入课程教学过程中;同时对教学内容如何借助仿真实验给出几点建议,并给出了具体仿真实例。通过改变教学方法多样性,加强学生对课程的理解与实际应用,提高学习的积极性,加强课堂效果。 相似文献