基于组合加权评分的Item-based协同过滤算法   总被引：1，自引：0，他引：1  

马丽 《现代图书情报技术》2008,24(11):60-64

针对Item-based协同过滤算法中用户评分数据稀疏性严重影响推荐质量的问题,提出一种基于组合加权评分的Item-based协同过滤算法,以用户评分项并集作为用户相似性计算基础,并提出一种组合加权评分方法来对并集中的未评分项进行计算和填补,从而降低了数据稀疏性。实验结果表明该算法能有效提高推荐质量。  相似文献   

素质教育视域下的大学体育课程教学     

赵永寿 《搏击·武术科学》2011,8(2):115-116

培养具有高素质的复合型高等教育人才是学科发展和高等教育发展的必然要求。事实上,在培养具有知识面宽、综合创新能力强的复合型高等教育人才的过程中,大学体育课程教学可以发挥出重要的、独特的作用。  相似文献   

Relative age and birthplace effect in Japanese professional sports: a quantitative evaluation using a Bayesian hierarchical Poisson model     

Hideaki Ishigami 《Journal of sports sciences》2016,34(2):143-154

Relative age effect (RAE) in sports has been well documented. Recent studies investigate the effect of birthplace in addition to the RAE. The first objective of this study was to show the magnitude of the RAE in two major professional sports in Japan, baseball and soccer. Second, we examined the birthplace effect and compared its magnitude with that of the RAE. The effect sizes were estimated using a Bayesian hierarchical Poisson model with the number of players as dependent variable. The RAEs were 9.0% and 7.7% per month for soccer and baseball, respectively. These estimates imply that children born in the first month of a school year have about three times greater chance of becoming a professional player than those born in the last month of the year. Over half of the difference in likelihoods of becoming a professional player between birthplaces was accounted for by weather conditions, with the likelihood decreasing by 1% per snow day. An effect of population size was not detected in the data. By investigating different samples, we demonstrated that using quarterly data leads to underestimation and that the age range of sampled athletes should be set carefully.  相似文献   

无机物质数据库系统的研究与开发     

龙斌  黄春保  杨水彬  莫小曼  郝卫东 《郧阳师范高等专科学校学报》2005,25(3):71-73

无机物质数据库系统的开发过程.分为需求分析,流程分析,开发及运行环境选择,设计与实现四个步骤,该系统的运行情况证明使用该系统管理数据可显著提高生产率.  相似文献   

The Birthday Problem Revisited     

Jonny Griffiths 《Teaching Statistics》1999,21(3):78-80

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并列结构组成成分排序原则及原因初探     

张彦群  辛长顺 《天中学刊》2002,17(4):69-73

并列结构语序从纯语法上说其关系至关重要，是自由灵活的，但如果从语义和语用的角度看，又是相对固定的，排序时要受到多种原则的制约。汉语并列结构组成成分排序大致遵循如下原则：时空原则、感知原则、文化原则、语音原则、逻辑原则、语境原则、语言习惯等。这些排序原则是以认知心理、社会文化、语音特征、逻辑事理、约定俗成等多种因素为基础而形成的。  相似文献   

带干扰的多险种破产模型的研究     

周巧 《常熟理工学院学报》2011,25(2):28-31

对带随机干扰因素的多类索赔模型的破产问题进行了研究,得出轻尾随机变量的风险和过程Lundberg指数,应用鞅论方法,获得了多险种的破产概率公式.  相似文献   

基于复合协调度模型的创新主体协同机理研究     

张萌  戚湧 《科技管理研究》2020,40(18):8-14

创新主体协同对提高产业技术创新能力具有重要意义。本文基于复合协调度模型,利用高技术产业不同行业2013-2017年面板数据,对创新主体协同进行机理分析。研究发现,以企业为核心的产业技术内部创新主体与政府、高校、科研院所等外部创新主体协同度虽然增加,但整体水平不高,高技术产业不同行业创新主体协同度存在显著差异,高技术产业5大行业中电子及通讯设备制造业创新主体之间的协同度最高,航空、航天器及设备制造业创新主体协同度最低且增加的幅度也低于其他行业,最后针对存在的问题提出了相关对策建议。  相似文献   

Study on quality control method for compound Shanzha Granules     

付延伟  程艳芹 《科技风》2015,(9)

Objective:To establish the quality standard of Compound Shanzha Granules.Methods:Crataegi Fructus and Cassiae Semen were identified by TLC.The contents of Autrantio-obtusin and Chrysophanol in Cassiae Semen were determined by HPLC.Results:The relevant spots on TLC plates were clear by the blank reference.The contents showed good linearitis in the range of 0.0357~0.3570μg for Autrantio-obtusin and 0.0520~0.5200μg for Chrysophanol.Conclusions:The method are simple,accurate and reproducible.  相似文献   

复辞辞格形成的多样性     

马晓红 《毕节学院学报》2011,29(11):7-12

与其他辞格相比,复辞未得到应有的重视,但是自先秦开始到现在,这种辞格的应用一直非常广泛。多种修辞格如转类、拈连、对偶、同异、排比、双关、顶针、回文等均可以形成复辞,显示了复辞形成的独特性。  相似文献