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带负项值的on-shelf效用项集并行挖掘算法
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作者 陈丽娟 谢伙生 《计算机与现代化》 2018年第4期13-16,21,共5页
为了提高带负项值的on-shelf效用项集挖掘算法的挖掘效率,提出带负项值的on-shelf效用项集并行挖掘算法DTP-Houn,算法基于MapReduce框架,充分利用其on-shelf时间段因素,将原始事务数据库按照时间段进行分片。算法将挖掘过程转化为MapRed... 为了提高带负项值的on-shelf效用项集挖掘算法的挖掘效率,提出带负项值的on-shelf效用项集并行挖掘算法DTP-Houn,算法基于MapReduce框架,充分利用其on-shelf时间段因素,将原始事务数据库按照时间段进行分片。算法将挖掘过程转化为MapReduce工作,Map阶段在分片数据库中挖掘候选项集,Reduce阶段并行计算候选项集的on-shelf效用值。实验结果表明,算法取得了较高的挖掘效率。 展开更多
关键词 效用项集挖掘 on-shelf时间段 MAPREDUCE 负项值
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先天性髋关节脱位髋臼覆盖重建术式的选择 被引量:2
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作者 孙磊 宁志杰 +4 位作者 廖可国 田敏 李雷 骆刚 常辉 《中国矫形外科杂志》 CAS CSCD 1998年第4期297-299,共3页
自1994年12月,我科对38例52髋先天性髋关节脱位术前不牵引,一期综合手术矫正全部畸形。手术中依据股骨头与髋臼的病理改变,本组52髋中,34髋行Salter骨盆截骨,15髋行髋臼加盖,3髋行Pemberton截骨... 自1994年12月,我科对38例52髋先天性髋关节脱位术前不牵引,一期综合手术矫正全部畸形。手术中依据股骨头与髋臼的病理改变,本组52髋中,34髋行Salter骨盆截骨,15髋行髋臼加盖,3髋行Pemberton截骨。本组52髋术后均获得满意复位,髋臼覆盖明显改善。其中30例41髋随访8~30个月,按Muler和Seddon的标准,优28髋,良10髋,可3髋。由于每例先天性髋关节脱位的病理改变有所不同,对其髋臼覆盖重建方式应根据具体情况灵活选择。 展开更多
关键词 先天性 髋关节脱位 髋臼成形 骨盆截骨 髋臼加盖
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藏借阅一体化开架管理的探讨 被引量:14
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作者 陈莺 《遵义师范学院学报》 2002年第2期89-90,105,共3页
本文论述了现代化的图书馆应采用藏借阅一体化的开架管理模式 ,以体现“藏以致用”的原则 。
关键词 藏借阅一体化 开架管理
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A Quarterly High RFM Mining Algorithm for Big Data Management
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作者 Cuiwei Peng Jiahui Chen +1 位作者 Shicheng Wan Guotao Xu 《Computers, Materials & Continua》 SCIE EI 2024年第9期4341-4360,共20页
In today’s highly competitive retail industry,offline stores face increasing pressure on profitability.They hope to improve their ability in shelf management with the help of big data technology.For this,on-shelf ava... In today’s highly competitive retail industry,offline stores face increasing pressure on profitability.They hope to improve their ability in shelf management with the help of big data technology.For this,on-shelf availability is an essential indicator of shelf data management and closely relates to customer purchase behavior.RFM(recency,frequency,andmonetary)patternmining is a powerful tool to evaluate the value of customer behavior.However,the existing RFM patternmining algorithms do not consider the quarterly nature of goods,resulting in unreasonable shelf availability and difficulty in profit-making.To solve this problem,we propose a quarterly RFM mining algorithmfor On-shelf products named OS-RFM.Our algorithmmines the high recency,high frequency,and high monetary patterns and considers the period of the on-shelf goods in quarterly units.We conducted experiments using two real datasets for numerical and graphical analysis to prove the algorithm’s effectiveness.Compared with the state-of-the-art RFM mining algorithm,our algorithm can identify more patterns and performs well in terms of precision,recall,and F1-score,with the recall rate nearing 100%.Also,the novel algorithm operates with significantly shorter running times and more stable memory usage than existing mining algorithms.Additionally,we analyze the sales trends of products in different quarters and seasonal variations.The analysis assists businesses in maintaining reasonable on-shelf availability and achieving greater profitability. 展开更多
关键词 Data mining recency pattern high-utility itemset RFM pattern mining on-shelf management
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