Purpose： This research aims to identify product search tasks in online shopplng ana analyze the characteristics of consumer multi-tasking search sessions. Design/methodology/approach： The experimental dataset contai...Purpose： This research aims to identify product search tasks in online shopplng ana analyze the characteristics of consumer multi-tasking search sessions. Design/methodology/approach： The experimental dataset contains 8,949 queries of 582 users from 3,483 search sessions. A sequential comparison of the Jaccard similarity coefficient between two adjacent search queries and hierarchical clustering of queries is used to identify search tasks. Findings： （1） Users issued a similar number of queries （1.43 to 1.47） with similar lengths （7.3-7.6 characters） per task in mono-tasking and multi-tasking sessions, and （2） Users spent more time on average in sessions with more tasks, but spent less time for each task when the number of tasks increased in a session. Research limitations： The task identification method that relies only on query terms does not completely reflect the complex nature of consumer shopping behavior.Practical implications： These results provide an exploratory understanding of the relationships among multiple shopping tasks, and can be useful for product recommendation and shopping task prediction. Originality/value： The originality of this research is its use of query clustering with online shopping task identification and analysis, and the analysis of product search session characteristics.展开更多
1.教学目标(说明所选取的1个完整课时的具体教学目标,以及该目标与单元教学目标间的关系)选取课时Unit 5 Section A(3a-3c)The Difficult Search for American Products in the US 1.1教学目标本课时的主题是"The Difficult Search...1.教学目标(说明所选取的1个完整课时的具体教学目标,以及该目标与单元教学目标间的关系)选取课时Unit 5 Section A(3a-3c)The Difficult Search for American Products in the US 1.1教学目标本课时的主题是"The Difficult Search for American Products in the US",通过学习,学生能够:(1)(学习理解)通过阅读文章,获取篇章结构,理解含有被动语态的中国制造的语篇,提取关于中国制造的细节信息.梳理文中提到的代词指代.展开更多
The degradation of ethinylestradiol (EE, an orally bio-active estrogen) in an aqueous-methanolic solution using a Ti/TiO2 thin-film electrode and UV radiation (a photoelectrocatalytic system) was evaluated. Hence, HPL...The degradation of ethinylestradiol (EE, an orally bio-active estrogen) in an aqueous-methanolic solution using a Ti/TiO2 thin-film electrode and UV radiation (a photoelectrocatalytic system) was evaluated. Hence, HPLC/UV analysis shows that EE (at 0.34 mmol) is totally consumed after 30 minutes of exposure to the photoelectrocatalytic system in the presence of Na2SO4 (0.1 mol·L-1) and with an applied bias potential of +1.0 V versus the Ag/AgCl reference electrode. Moreover, monitoring by direct infusion electrospray ionization mass spectrometry (ESI-MS) and SPME-GC/ MS (solid phase microextraction coupled with gas chromatography-mass spectrometry) reveals that apparently no degradation products are formed under these conditions. Hence, this study demonstrates that the photoelectrocatalytic system can be efficiently used to promote the complete degradation (and likely mineralization) of this hormone under these conditions.展开更多
目的评估血液净化装置的体外循环血路临床使用中的不良事件及其可能原因,为临床安全用械提供建议。方法系统检索PubMed、Embase、Web of Science、Cochrane Library及SinoMed、CNKI、VIP、WanFang Data等中英文文献数据库,检索时限为201...目的评估血液净化装置的体外循环血路临床使用中的不良事件及其可能原因,为临床安全用械提供建议。方法系统检索PubMed、Embase、Web of Science、Cochrane Library及SinoMed、CNKI、VIP、WanFang Data等中英文文献数据库,检索时限为2010年1月1日—2025年7月25日,搜集血液净化装置的体外循环血路临床应用相关不良事件,总结不良事件类型与原因。基于同时期美国食品药品管理局的MAUDE数据库,运用报告比值比(ROR)法、贝叶斯置信度递进神经网络(BCPNN)法和伽马泊松分布缩减(GPS)法进行不良事件信号检测,进一步分析其风险特征。结果共纳入相关文献9篇。体外循环血路在临床使用中的主要风险为连接相关问题,具体包括连接故障、连接不紧密、密封性差、断开及配件脱落等。文献分析表明,产品质量问题是导致器械故障的首要原因,占总报告例次的46.6%;其次为操作技术因素。MAUDE数据库中检索到相关器械不良事件与患者不良事件记录分别为642条和523条;信号检测共发现13个阳性信号。结论体外循环血路在临床应用中主要面临连接类不良事件的风险,其发生主要与产品质量相关,操作技术也是重要影响因素。建议生产企业加强对连接部位的全流程质量控制,优化包装设计以减少运输中配件脱落,并增加使用前检查与紧固的明确警示。同时,临床医护人员应重视制定个体化治疗方案,持续提升专业操作技能,共同降低相关不良事件的发生风险。展开更多
This paper considers a scheduling problem in industrial make-and-pack batch production process. This process equips with sequence-dependent changeover time, multipurpose storage units with limited capacity, storage ti...This paper considers a scheduling problem in industrial make-and-pack batch production process. This process equips with sequence-dependent changeover time, multipurpose storage units with limited capacity, storage time, batch splitting, partial equipment connectivity and transfer time. The objective is to make a production plan to satisfy all constraints while meeting demand requirement of packed products from various product families. This problem is NP-hard and the problem size is exponentially large for a realistic-sized problem. Therefore,we propose a genetic algorithm to handle this problem. Solutions to the problems are represented by chromosomes of product family sequences. These sequences are decoded to assign the resource for producing packed products according to forward assignment strategy and resource selection rules. These techniques greatly reduce unnecessary search space and improve search speed. In addition, design of experiment is carefully utilized to determine appropriate parameter settings. Ant colony optimization and Tabu search are also implemented for comparison. At the end of each heuristics, local search is applied for the packed product sequence to improve makespan. In an experimental analysis, all heuristics show the capability to solve large instances within reasonable computational time. In all problem instances, genetic algorithm averagely outperforms ant colony optimization and Tabu search with slightly longer computational time.展开更多
基金supported by the National Science Foundation of China(NSFC)Grant(No.71373015)
文摘Purpose： This research aims to identify product search tasks in online shopplng ana analyze the characteristics of consumer multi-tasking search sessions. Design/methodology/approach： The experimental dataset contains 8,949 queries of 582 users from 3,483 search sessions. A sequential comparison of the Jaccard similarity coefficient between two adjacent search queries and hierarchical clustering of queries is used to identify search tasks. Findings： （1） Users issued a similar number of queries （1.43 to 1.47） with similar lengths （7.3-7.6 characters） per task in mono-tasking and multi-tasking sessions, and （2） Users spent more time on average in sessions with more tasks, but spent less time for each task when the number of tasks increased in a session. Research limitations： The task identification method that relies only on query terms does not completely reflect the complex nature of consumer shopping behavior.Practical implications： These results provide an exploratory understanding of the relationships among multiple shopping tasks, and can be useful for product recommendation and shopping task prediction. Originality/value： The originality of this research is its use of query clustering with online shopping task identification and analysis, and the analysis of product search session characteristics.
文摘1.教学目标(说明所选取的1个完整课时的具体教学目标,以及该目标与单元教学目标间的关系)选取课时Unit 5 Section A(3a-3c)The Difficult Search for American Products in the US 1.1教学目标本课时的主题是"The Difficult Search for American Products in the US",通过学习,学生能够:(1)(学习理解)通过阅读文章,获取篇章结构,理解含有被动语态的中国制造的语篇,提取关于中国制造的细节信息.梳理文中提到的代词指代.
文摘The degradation of ethinylestradiol (EE, an orally bio-active estrogen) in an aqueous-methanolic solution using a Ti/TiO2 thin-film electrode and UV radiation (a photoelectrocatalytic system) was evaluated. Hence, HPLC/UV analysis shows that EE (at 0.34 mmol) is totally consumed after 30 minutes of exposure to the photoelectrocatalytic system in the presence of Na2SO4 (0.1 mol·L-1) and with an applied bias potential of +1.0 V versus the Ag/AgCl reference electrode. Moreover, monitoring by direct infusion electrospray ionization mass spectrometry (ESI-MS) and SPME-GC/ MS (solid phase microextraction coupled with gas chromatography-mass spectrometry) reveals that apparently no degradation products are formed under these conditions. Hence, this study demonstrates that the photoelectrocatalytic system can be efficiently used to promote the complete degradation (and likely mineralization) of this hormone under these conditions.
文摘目的评估血液净化装置的体外循环血路临床使用中的不良事件及其可能原因,为临床安全用械提供建议。方法系统检索PubMed、Embase、Web of Science、Cochrane Library及SinoMed、CNKI、VIP、WanFang Data等中英文文献数据库,检索时限为2010年1月1日—2025年7月25日,搜集血液净化装置的体外循环血路临床应用相关不良事件,总结不良事件类型与原因。基于同时期美国食品药品管理局的MAUDE数据库,运用报告比值比(ROR)法、贝叶斯置信度递进神经网络(BCPNN)法和伽马泊松分布缩减(GPS)法进行不良事件信号检测,进一步分析其风险特征。结果共纳入相关文献9篇。体外循环血路在临床使用中的主要风险为连接相关问题,具体包括连接故障、连接不紧密、密封性差、断开及配件脱落等。文献分析表明,产品质量问题是导致器械故障的首要原因,占总报告例次的46.6%;其次为操作技术因素。MAUDE数据库中检索到相关器械不良事件与患者不良事件记录分别为642条和523条;信号检测共发现13个阳性信号。结论体外循环血路在临床应用中主要面临连接类不良事件的风险,其发生主要与产品质量相关,操作技术也是重要影响因素。建议生产企业加强对连接部位的全流程质量控制,优化包装设计以减少运输中配件脱落,并增加使用前检查与紧固的明确警示。同时,临床医护人员应重视制定个体化治疗方案,持续提升专业操作技能,共同降低相关不良事件的发生风险。
基金Thailand Research Fund (Grant #MRG5480176)National Research University Project of Thailand Office of Higher Education Commission
文摘This paper considers a scheduling problem in industrial make-and-pack batch production process. This process equips with sequence-dependent changeover time, multipurpose storage units with limited capacity, storage time, batch splitting, partial equipment connectivity and transfer time. The objective is to make a production plan to satisfy all constraints while meeting demand requirement of packed products from various product families. This problem is NP-hard and the problem size is exponentially large for a realistic-sized problem. Therefore,we propose a genetic algorithm to handle this problem. Solutions to the problems are represented by chromosomes of product family sequences. These sequences are decoded to assign the resource for producing packed products according to forward assignment strategy and resource selection rules. These techniques greatly reduce unnecessary search space and improve search speed. In addition, design of experiment is carefully utilized to determine appropriate parameter settings. Ant colony optimization and Tabu search are also implemented for comparison. At the end of each heuristics, local search is applied for the packed product sequence to improve makespan. In an experimental analysis, all heuristics show the capability to solve large instances within reasonable computational time. In all problem instances, genetic algorithm averagely outperforms ant colony optimization and Tabu search with slightly longer computational time.
