随着电子商务的蓬勃发展,海量客户需求和高频率、多品种、小批量的订单特性为订单拣选业务带来巨大挑战。在物流智能化的趋势下,大量电商企业采用移动机器人拣货系统(Robotic Mobile Fulfillment System,RMFS)进行订单拣选。订单分配和...随着电子商务的蓬勃发展,海量客户需求和高频率、多品种、小批量的订单特性为订单拣选业务带来巨大挑战。在物流智能化的趋势下,大量电商企业采用移动机器人拣货系统(Robotic Mobile Fulfillment System,RMFS)进行订单拣选。订单分配和拣选路径规划是影响仓库订单拣选效率的关键决策。为了提高电商RMFS系统拣选效率,降低仓库运营成本,基于电商企业多订单、多货架、多拣选站下的拣选业务场景,以最小化机器人负载距离为目标,构建订单分配与路径规划联合优化模型,设计两阶段的A*算法和自适应大领域搜索算法(Adaptive Large Neighborhood Search,ALNS),在ALNS算法原有框架的基础上提出新的移除和修复算子以适应订单分配问题,并针对30个不同规模算例进行计算分析。计算结果表明,所提出的优化方法收敛快、性能稳定,能够有效缩短机器人行走距离,相比先到先拣选策略最大可缩短47.6%的机器人负载距离。同时,也可在更短时间内获得与CPLEX求解质量相近的解。尤其是当订单数量增长时,相比CPLEX具有突出时间优势,可以实现电商仓储资源的合理调度和配置,从而为电商企业仓储智能化提供有效决策指导。展开更多
在全球零售额和当天交货量不断增长的时代,实现订单的快速交付和优质分批是影响移动机器人履行系统(Robotic Mobile Fulfillment Systems,RMFS)拣选效率的关键因素.为构造高质量订单分配批次、提升RMFS系统拣选效率,提出融合大邻域搜索...在全球零售额和当天交货量不断增长的时代,实现订单的快速交付和优质分批是影响移动机器人履行系统(Robotic Mobile Fulfillment Systems,RMFS)拣选效率的关键因素.为构造高质量订单分配批次、提升RMFS系统拣选效率,提出融合大邻域搜索的改进差分进化算法(LNS_DE),引入大邻域搜索的破坏与修复思想及一批基于随机、基于最大代价贡献和基于集中批次的移除算子以及新的插入算子组件,以最小化订单总延迟时间为目标建立订单分批优化模型,并针对不同订单规模算例进行实验仿真.仿真结果表明,所提出的订单分批优化算法较差分进化算法(DE)相比求解质量更优,性能更稳定、收敛速度更快,尤其当订单数量增大时,LNS_DE算法解的平均值优化比例不断扩大,这为提高RMFS系统拣选效率,实现订单快速响应提供有效决策指导.展开更多
将大肠杆菌的rpoS和rmf基因突变型和野生型菌株分别培养在营养丰富的LB培养基和成分有限的EP培养基上。在相同条件下,进入稳定期后的突变型菌株的活细胞数低于野生菌株。采用 Western blot方法测定了不同基因产物在稳定期的变化。σ^(38...将大肠杆菌的rpoS和rmf基因突变型和野生型菌株分别培养在营养丰富的LB培养基和成分有限的EP培养基上。在相同条件下,进入稳定期后的突变型菌株的活细胞数低于野生菌株。采用 Western blot方法测定了不同基因产物在稳定期的变化。σ^(38)对RNA聚合酶核心酶亚单位结构基因 rpoA、rpoB、rpoC以及groEs和tufA基因的表达影响不大,能抑制crp和促进rmf的表达。RMF在营养丰富的条件下对rpoA、rpoD,groEl、rho、tufA和ompA基因的表达有促进作用,而在EP条件下的影响并不明显,对crp和rpoS的表达分别有抑制和促进作用。展开更多
Healthcare security and privacy breaches are occurring in the United States (US), and increased substantially during the pandemic. This paper reviews the National Institute of Standards and Technology (NIST) publicati...Healthcare security and privacy breaches are occurring in the United States (US), and increased substantially during the pandemic. This paper reviews the National Institute of Standards and Technology (NIST) publication base as an effective solution. The NIST Special Publication 800-66 Revision 1 was an essential standard in US healthcare, which was withdrawn in February 2024 and superseded by SP 800-66 Revision 2. This review investigates the academic papers concerning the application of the NIST SP 800-66 Revision 1 standard in the US healthcare literature. A systematic review method was used in this study to determine current knowledge gaps of the SP 800-66 Revision 1. Some limitations were employed in the search to enforce validity. A total of eleven articles were found eligible for the study. Consequently, this study suggests the necessity for additional academic papers pertaining to SP 800-66 Revision 2 in the US healthcare literature. In turn, it will enhance awareness of safeguarding electronic protected health information (ePHI), help to mitigate potential future risks, and eventually reduce breaches.展开更多
The relativistic mean-field （RMF） theory is used to calculate the properties of A =7-9 drip-line nuclei ^7Li, ^7;9Be, ^8;9B, and ^9C. Systematic deviations between experimental and theoretical binding energies are f...The relativistic mean-field （RMF） theory is used to calculate the properties of A =7-9 drip-line nuclei ^7Li, ^7;9Be, ^8;9B, and ^9C. Systematic deviations between experimental and theoretical binding energies are found. Possible reasons of these systematic deviations are discussed in terms of pairing energy. The root-mean-square （rms） radii of matter distributions for these nuclei agree with the experimental data quite well. The one-proton halo structure in ^8B is reproduced well, and the two-proton halo in ^9C is predicted. The calculations show that the RMF theory is valid in studying the properties of light drip-line nuclei.展开更多
文摘随着电子商务的蓬勃发展,海量客户需求和高频率、多品种、小批量的订单特性为订单拣选业务带来巨大挑战。在物流智能化的趋势下,大量电商企业采用移动机器人拣货系统(Robotic Mobile Fulfillment System,RMFS)进行订单拣选。订单分配和拣选路径规划是影响仓库订单拣选效率的关键决策。为了提高电商RMFS系统拣选效率,降低仓库运营成本,基于电商企业多订单、多货架、多拣选站下的拣选业务场景,以最小化机器人负载距离为目标,构建订单分配与路径规划联合优化模型,设计两阶段的A*算法和自适应大领域搜索算法(Adaptive Large Neighborhood Search,ALNS),在ALNS算法原有框架的基础上提出新的移除和修复算子以适应订单分配问题,并针对30个不同规模算例进行计算分析。计算结果表明,所提出的优化方法收敛快、性能稳定,能够有效缩短机器人行走距离,相比先到先拣选策略最大可缩短47.6%的机器人负载距离。同时,也可在更短时间内获得与CPLEX求解质量相近的解。尤其是当订单数量增长时,相比CPLEX具有突出时间优势,可以实现电商仓储资源的合理调度和配置,从而为电商企业仓储智能化提供有效决策指导。
文摘在全球零售额和当天交货量不断增长的时代,实现订单的快速交付和优质分批是影响移动机器人履行系统(Robotic Mobile Fulfillment Systems,RMFS)拣选效率的关键因素.为构造高质量订单分配批次、提升RMFS系统拣选效率,提出融合大邻域搜索的改进差分进化算法(LNS_DE),引入大邻域搜索的破坏与修复思想及一批基于随机、基于最大代价贡献和基于集中批次的移除算子以及新的插入算子组件,以最小化订单总延迟时间为目标建立订单分批优化模型,并针对不同订单规模算例进行实验仿真.仿真结果表明,所提出的订单分批优化算法较差分进化算法(DE)相比求解质量更优,性能更稳定、收敛速度更快,尤其当订单数量增大时,LNS_DE算法解的平均值优化比例不断扩大,这为提高RMFS系统拣选效率,实现订单快速响应提供有效决策指导.
文摘将大肠杆菌的rpoS和rmf基因突变型和野生型菌株分别培养在营养丰富的LB培养基和成分有限的EP培养基上。在相同条件下,进入稳定期后的突变型菌株的活细胞数低于野生菌株。采用 Western blot方法测定了不同基因产物在稳定期的变化。σ^(38)对RNA聚合酶核心酶亚单位结构基因 rpoA、rpoB、rpoC以及groEs和tufA基因的表达影响不大,能抑制crp和促进rmf的表达。RMF在营养丰富的条件下对rpoA、rpoD,groEl、rho、tufA和ompA基因的表达有促进作用,而在EP条件下的影响并不明显,对crp和rpoS的表达分别有抑制和促进作用。
文摘Healthcare security and privacy breaches are occurring in the United States (US), and increased substantially during the pandemic. This paper reviews the National Institute of Standards and Technology (NIST) publication base as an effective solution. The NIST Special Publication 800-66 Revision 1 was an essential standard in US healthcare, which was withdrawn in February 2024 and superseded by SP 800-66 Revision 2. This review investigates the academic papers concerning the application of the NIST SP 800-66 Revision 1 standard in the US healthcare literature. A systematic review method was used in this study to determine current knowledge gaps of the SP 800-66 Revision 1. Some limitations were employed in the search to enforce validity. A total of eleven articles were found eligible for the study. Consequently, this study suggests the necessity for additional academic papers pertaining to SP 800-66 Revision 2 in the US healthcare literature. In turn, it will enhance awareness of safeguarding electronic protected health information (ePHI), help to mitigate potential future risks, and eventually reduce breaches.
基金supported by the Knowledge Innovation Project of Chinese Academy of Sciences under Grant No.KJCX3-SYW-N2
文摘The relativistic mean-field （RMF） theory is used to calculate the properties of A =7-9 drip-line nuclei ^7Li, ^7;9Be, ^8;9B, and ^9C. Systematic deviations between experimental and theoretical binding energies are found. Possible reasons of these systematic deviations are discussed in terms of pairing energy. The root-mean-square （rms） radii of matter distributions for these nuclei agree with the experimental data quite well. The one-proton halo structure in ^8B is reproduced well, and the two-proton halo in ^9C is predicted. The calculations show that the RMF theory is valid in studying the properties of light drip-line nuclei.
