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Collaborative filtering(CF) has been widely applied to recommender systems,since it can assist users to discover their favorite items.Similarity measurement that measures the similarity between two users or items is critical to CF.However,traditional similarity measurement approaches for memory-based CF can be strongly improved.In this paper,we propose a novel similarity measurement,named Jaccard Uniform Operator Distance(JacUOD),to effectively measure the similarity.Our JacUOD approach aims at unifying similarity comparison for vectors in different multidimensional vector spaces.Compared with traditional similarity measurement approaches,JacUOD properly handles dimension-number difference for different vector spaces.We conduct experiments based on the well-known MovieLens datasets,and take user-based CF as an example to show the effectiveness of our approach.The experimental results show that our JacUOD approach achieves better prediction accuracy than traditional similarity measurement approaches. 相似文献
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阐述了用微程序设计思想进行SCADA系统设计的方法,着重叙述了在非多任务操作系统环境下,其设计方法和原理以及微程序设计方法在实际系统中的实现和使用情况。 相似文献
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针对我国农村偏远地区经济基础薄弱,人们环保意识淡薄,居民生活污水乱排放等特点,文章介绍了一种源于日本的一体化污水处理装置净化槽,对其工艺原理、处理流程、处理特点及其使用情况和相应的法律法规体系及今后在中国发展推广中遇到的问题和对策做了简要阐述。 相似文献
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[目的]研究倾斜土槽装置适宜的污水流量负荷.[方法]以5层倾斜土槽组合装置填充蜂窝煤渣和砂壤土,采用连续进水方式对人工配制的生活污水进行3种不同污水流量(100、200和300 L/d)对污染物指标去除效果的试验研究.[结果]3种污水流量处理对BOD<,5>COD、TP、TN等水质指标的平均去除率差异均不显著,但以100 L/d污水流量处理下污染物的去除率相对较大;倾斜土槽装置对BOD<,5>、COD的去除率大都在87.8%-90.2%.对TP的去除率在98.4%-98.7%,TN的去除率也在72.0%~74.05%范围内.[结论]不同污水流量下倾斜土槽装置对生活污水的净化效果良好. 相似文献