Resource allocation for multi-tier web appli- cations in virtualization environments is one of the most important problems in autonomous computing. On one hand, the more resources that are provisioned to a multi- tier...Resource allocation for multi-tier web appli- cations in virtualization environments is one of the most important problems in autonomous computing. On one hand, the more resources that are provisioned to a multi- tier web application, the easier it is to meet service level objectives （SLO）. On the other hand, the virtual machine which hosts the multi-tier web application needs to be consolidated as much as possible in order to maintain high resource utilization. This paper presents an adaptive resource controller which consists of a feedback utiliza- tion controller and an auto-regressive and moving average model （ARMA）-based model estimator. It can meet application-level quality of service （QoS） goals while achieving high resource utilization. To evaluate the proposed controllers, simulations are performed on a testbed simulating a virtual data center using Xen virtual machines. Experimental results indicate that the control- lers can improve CPU utilization and make the best trade- off between resource utilization and performance for multi-tier web applications.展开更多
目的:借助CiteSpace分析近15年(2010年至2024年)非酒精性脂肪性肝病(NAFLD)的中医药治疗研究现状与发展趋势,为后续研究提供参考。方法:检索2010年1月1日至2024年10月31日收录至Web of Science Core Collection的有关中医药治疗NAFLD的...目的:借助CiteSpace分析近15年(2010年至2024年)非酒精性脂肪性肝病(NAFLD)的中医药治疗研究现状与发展趋势,为后续研究提供参考。方法:检索2010年1月1日至2024年10月31日收录至Web of Science Core Collection的有关中医药治疗NAFLD的相关文献,对发文量、作者、国家及机构、关键词、共被引用等进行可视化分析。结果:共纳入文献367篇,发文量整体呈上升趋势,发文量最多的作者是来自中国的Ji,发文量排名前3的国家是中国、韩国、美国,发文量最多的机构是上海中医药大学,关键词共现分析和聚类分析显示目前研究热点主要为中医药治疗NAFLD的机制研究与数据挖掘。结论:对中医药治疗NAFLD的热度持续增长,多靶点治疗、数据挖掘、高质量的临床RCT试验等具有较好的发展潜力,加强国际间的合作交流有助于进一步挖掘中医药的潜力,推动中医药国际化的进程。展开更多
Energy access remains a critical challenge in rural South Sudan,with communities heavily relying on expensive and unfriendly environmental energy sources such as diesel generators and biomass.This study addresses the ...Energy access remains a critical challenge in rural South Sudan,with communities heavily relying on expensive and unfriendly environmental energy sources such as diesel generators and biomass.This study addresses the predicament by evaluating the feasibility of renewable energy-based decentralized electrification in the selected village ofDoleibHill,UpperNile,South Sudan.Using a demand assessment and theMulti-Tier Framework(MTF)approach,it categorizes households,public facilities,private sector,Non-GovernmentalOrganizations(NGOs)and business energy needs and designs an optimized hybrid energy system incorporating solar Photovoltaic(PV),wind turbines,batteries,and a generator.The proposed system,simulated in Hybrid Optimization Model Electric Renewable(HOMER)Pro,demonstrates strong economic viability,with a present worth of$292,145,an annual worth of$22,854,a return on investment(ROI)of 36.5%,and an internal rate of return(IRR)of 42.1%.The simple payback period is 2.31 years,and the discounted payback period is 2.62 years.The system achieves a levelized cost of energy(LCOE)of$0.276/kWh and significantly reduces dependence on diesel,producing 798,800 kWh annually fromwind energy.This research provides a replicable model for cost-effective,sustainable rural electrification,offering valuable insights for policymakers and energy planners seeking to expand electricity access in off-grid communities.展开更多
This article proposes a multi-tiered fault detection system for series-connected lithium-ion battery modules.Improper use of batteries can lead to electrolyte decomposition,resulting in the formation of lithium dendri...This article proposes a multi-tiered fault detection system for series-connected lithium-ion battery modules.Improper use of batteries can lead to electrolyte decomposition,resulting in the formation of lithium dendrites.These dendrites may pierce the separator,leading to the failure of the insulation layer between electrodes and causing micro short circuits.When a micro short circuit occurs,the electrolyte typically undergoes exothermic reactions,leading to thermal runaway and posing a safety risk to users.Relying solely on temperature-based judgment mechanisms within the battery management system often results in delayed intervention.To address this issue,the article develops a multi-tiered fault detection algorithm for series-connected lithium-ion batteries.This algorithm can effectively diagnose micro short circuits,aging,and normal batteries using minimal battery data,thereby improving diagnostic accuracy and enhancing the flexibility of fault detection.Simulations and experiments conducted under various levels of micro short circuits validate the effectiveness of the algorithm,demonstrating its ability to distinguish between short-circuited,aged,and normal batteries under different conditions.This technology can be applied to electric vehicles and energy storage systems,enabling early warnings to ensure safety and prevent thermal runaway.展开更多
目的基于Web of Science核心合集数据库,对近十年糖尿病健康相关生命质量文献的研究现状、热点和前沿进行可视化分析,为未来糖尿病患者的健康相关生命质量研究提供参考。方法检索Web of Science核心合集数据库中与糖尿病健康相关生命质...目的基于Web of Science核心合集数据库,对近十年糖尿病健康相关生命质量文献的研究现状、热点和前沿进行可视化分析,为未来糖尿病患者的健康相关生命质量研究提供参考。方法检索Web of Science核心合集数据库中与糖尿病健康相关生命质量有关的原创性研究论文和综述,检索日期为2014年1月1日—2024年12月31日,使用文献计量学方法和CiteSpace 6.3.R1软件对文献的作者、发文国家/地区、机构、关键词等方面进行可视化分析。结果共纳入866篇文献。国内外关于糖尿病健康相关生命质量的发文量逐年递增,研究热点主要聚焦在糖尿病健康相关生命质量研究的护理和患者的心理状态,近期的热点和未来研究趋势为关注患者的社会支持、心理健康和低血糖症状等。结论我国研究者对糖尿病健康相关生命质量的关注范围不断扩大,但是国家及地区间合作、核心作者群等与国外相比仍存在差距。未来仍需要开展多中心、跨地区合作的高质量研究,关注患者的心理健康及预防并发症的护理模式,以提高糖尿病患者的健康相关生命质量。展开更多
文摘Resource allocation for multi-tier web appli- cations in virtualization environments is one of the most important problems in autonomous computing. On one hand, the more resources that are provisioned to a multi- tier web application, the easier it is to meet service level objectives （SLO）. On the other hand, the virtual machine which hosts the multi-tier web application needs to be consolidated as much as possible in order to maintain high resource utilization. This paper presents an adaptive resource controller which consists of a feedback utiliza- tion controller and an auto-regressive and moving average model （ARMA）-based model estimator. It can meet application-level quality of service （QoS） goals while achieving high resource utilization. To evaluate the proposed controllers, simulations are performed on a testbed simulating a virtual data center using Xen virtual machines. Experimental results indicate that the control- lers can improve CPU utilization and make the best trade- off between resource utilization and performance for multi-tier web applications.
文摘目的:借助CiteSpace分析近15年(2010年至2024年)非酒精性脂肪性肝病(NAFLD)的中医药治疗研究现状与发展趋势,为后续研究提供参考。方法:检索2010年1月1日至2024年10月31日收录至Web of Science Core Collection的有关中医药治疗NAFLD的相关文献,对发文量、作者、国家及机构、关键词、共被引用等进行可视化分析。结果:共纳入文献367篇,发文量整体呈上升趋势,发文量最多的作者是来自中国的Ji,发文量排名前3的国家是中国、韩国、美国,发文量最多的机构是上海中医药大学,关键词共现分析和聚类分析显示目前研究热点主要为中医药治疗NAFLD的机制研究与数据挖掘。结论:对中医药治疗NAFLD的热度持续增长,多靶点治疗、数据挖掘、高质量的临床RCT试验等具有较好的发展潜力,加强国际间的合作交流有助于进一步挖掘中医药的潜力,推动中医药国际化的进程。
文摘Energy access remains a critical challenge in rural South Sudan,with communities heavily relying on expensive and unfriendly environmental energy sources such as diesel generators and biomass.This study addresses the predicament by evaluating the feasibility of renewable energy-based decentralized electrification in the selected village ofDoleibHill,UpperNile,South Sudan.Using a demand assessment and theMulti-Tier Framework(MTF)approach,it categorizes households,public facilities,private sector,Non-GovernmentalOrganizations(NGOs)and business energy needs and designs an optimized hybrid energy system incorporating solar Photovoltaic(PV),wind turbines,batteries,and a generator.The proposed system,simulated in Hybrid Optimization Model Electric Renewable(HOMER)Pro,demonstrates strong economic viability,with a present worth of$292,145,an annual worth of$22,854,a return on investment(ROI)of 36.5%,and an internal rate of return(IRR)of 42.1%.The simple payback period is 2.31 years,and the discounted payback period is 2.62 years.The system achieves a levelized cost of energy(LCOE)of$0.276/kWh and significantly reduces dependence on diesel,producing 798,800 kWh annually fromwind energy.This research provides a replicable model for cost-effective,sustainable rural electrification,offering valuable insights for policymakers and energy planners seeking to expand electricity access in off-grid communities.
文摘This article proposes a multi-tiered fault detection system for series-connected lithium-ion battery modules.Improper use of batteries can lead to electrolyte decomposition,resulting in the formation of lithium dendrites.These dendrites may pierce the separator,leading to the failure of the insulation layer between electrodes and causing micro short circuits.When a micro short circuit occurs,the electrolyte typically undergoes exothermic reactions,leading to thermal runaway and posing a safety risk to users.Relying solely on temperature-based judgment mechanisms within the battery management system often results in delayed intervention.To address this issue,the article develops a multi-tiered fault detection algorithm for series-connected lithium-ion batteries.This algorithm can effectively diagnose micro short circuits,aging,and normal batteries using minimal battery data,thereby improving diagnostic accuracy and enhancing the flexibility of fault detection.Simulations and experiments conducted under various levels of micro short circuits validate the effectiveness of the algorithm,demonstrating its ability to distinguish between short-circuited,aged,and normal batteries under different conditions.This technology can be applied to electric vehicles and energy storage systems,enabling early warnings to ensure safety and prevent thermal runaway.
文摘目的基于Web of Science核心合集数据库,对近十年糖尿病健康相关生命质量文献的研究现状、热点和前沿进行可视化分析,为未来糖尿病患者的健康相关生命质量研究提供参考。方法检索Web of Science核心合集数据库中与糖尿病健康相关生命质量有关的原创性研究论文和综述,检索日期为2014年1月1日—2024年12月31日,使用文献计量学方法和CiteSpace 6.3.R1软件对文献的作者、发文国家/地区、机构、关键词等方面进行可视化分析。结果共纳入866篇文献。国内外关于糖尿病健康相关生命质量的发文量逐年递增,研究热点主要聚焦在糖尿病健康相关生命质量研究的护理和患者的心理状态,近期的热点和未来研究趋势为关注患者的社会支持、心理健康和低血糖症状等。结论我国研究者对糖尿病健康相关生命质量的关注范围不断扩大,但是国家及地区间合作、核心作者群等与国外相比仍存在差距。未来仍需要开展多中心、跨地区合作的高质量研究,关注患者的心理健康及预防并发症的护理模式,以提高糖尿病患者的健康相关生命质量。
