COVID-19, a contagious respiratory disease, presents immediate and unforeseen challenges to people worldwide. Moreover, its transmission rapidly extends globally due to its viral transmissibility, emergence of novel s...COVID-19, a contagious respiratory disease, presents immediate and unforeseen challenges to people worldwide. Moreover, its transmission rapidly extends globally due to its viral transmissibility, emergence of novel strains (variants), absence of immunity, and human unawareness. This framework introduces a revised epidemic model, drawing upon mathematical principles. This model incorporates a modified vaccination and lockdown approach to comprehensively depict an epidemics transmission, containment, and decision-making processes within a community. This study aims to provide policymakers with precise information on real-world situations to assist them in making informed decisions about the implementation of lockdown strategies, maintenance variables, and vaccine availability. The suggested model has conducted stability analysis, strength number analysis, and first and second-order derivative analysis of the Lyapunov function and has established the existence and uniqueness of solutions of the proposed models. We examine the combined effects of an effective vaccination campaign and non-pharmaceutical measures such as lockdowns and states of emergency. We rely on the results of this research to assist policymakers in various countries in eradicating the illness by developing more innovative measures to control the outbreak.展开更多
血液作为重要的资源,直接关系到患者生命健康和医疗业务活动连续性,鉴于其只能来自献血者的自愿捐赠,容易因外界各种因素影响而处于供应紧缺状态。本文作为介绍“英国血液紧缺应急计划”系列文章第一部分,旨在对英国应急管理体系,尤其...血液作为重要的资源,直接关系到患者生命健康和医疗业务活动连续性,鉴于其只能来自献血者的自愿捐赠,容易因外界各种因素影响而处于供应紧缺状态。本文作为介绍“英国血液紧缺应急计划”系列文章第一部分,旨在对英国应急管理体系,尤其是卫生应急管理的情况进行概述。本文阐述了英国的应急管理法规标准体系和机制体制、关于应急准备与实施指导意见的非法规性指导文件、以及负责应急协调与合作的跨部门多机构的地方韧性联席会议制度、英国政府能力建设、有关应急响应主体和应急指挥控制机制等内容;在此基础上,本文进一步详细介绍了英国卫生应急体系的法律基础和国家医疗服务体系(national health service,NHS)应急准备、韧性和响应(emergency preparedness,resilience and response,EPRR)核心标准体系,并列举了相应文件。展开更多
为解决电力短缺引发的无章程断电控电问题,凸显第三方监督机构在紧急需求响应中的实际价值,以供电短缺为背景建立了包含电力市场调度中心(power market scheduling center, PMSC)的电力市场交易机制。首先,设计了PMSC的实时控电策略,即...为解决电力短缺引发的无章程断电控电问题,凸显第三方监督机构在紧急需求响应中的实际价值,以供电短缺为背景建立了包含电力市场调度中心(power market scheduling center, PMSC)的电力市场交易机制。首先,设计了PMSC的实时控电策略,即通过设置各时段的控电额度对用户低于基准用电量的部分给予实时激励补贴,并提出了PMSC侧的福利模型。其次,基于前景理论,讨论了供电环境风险差异对用户用电主观偏好的影响,以此构建了含心理预期状态指标的用电效用量化模型。最后,建立了包含供需两侧及PMSC的社会福利最大化模型,利用拉格朗日对偶理论并根据设计的实现利益三方互动的分布式算法对该问题进行求解。仿真结果表明:相同供电环境下,用户心理预期的降低表现出用电量减少且效用增加;在此基础上提出的紧急需求响应模型能够在感知用户心理状态随供电环境的变化下提升缺电场景中用户侧的福利并维持一定的系统发电裕度,且实时激励价格和电价表现合理。该研究为电网在紧急情况下实现需求响应常态化运营提供了系统性的理论指导和切实可行的决策框架。展开更多
In this present paper, a deterministic lot size model is developed for deteriorating items with incremental quantity discounts. It is assumed that shortages are permitted to occur and fully backlogged. A simple solut...In this present paper, a deterministic lot size model is developed for deteriorating items with incremental quantity discounts. It is assumed that shortages are permitted to occur and fully backlogged. A simple solution procedure is shown for determining the optimal order lot size and the optimal order cycle. A numerical example is used to illustrate how the solution procedure works.展开更多
Solar energy, as a renewable resource, is an effective solution to the current global energy shortage problem. To actively respond to the call for "carbon peak" and "carbon neutrality", solar cell ...Solar energy, as a renewable resource, is an effective solution to the current global energy shortage problem. To actively respond to the call for "carbon peak" and "carbon neutrality", solar cell industry has experienced unprecedented development. The full utilization of solar energy resources remains an urgent issue to be addressed.展开更多
文摘COVID-19, a contagious respiratory disease, presents immediate and unforeseen challenges to people worldwide. Moreover, its transmission rapidly extends globally due to its viral transmissibility, emergence of novel strains (variants), absence of immunity, and human unawareness. This framework introduces a revised epidemic model, drawing upon mathematical principles. This model incorporates a modified vaccination and lockdown approach to comprehensively depict an epidemics transmission, containment, and decision-making processes within a community. This study aims to provide policymakers with precise information on real-world situations to assist them in making informed decisions about the implementation of lockdown strategies, maintenance variables, and vaccine availability. The suggested model has conducted stability analysis, strength number analysis, and first and second-order derivative analysis of the Lyapunov function and has established the existence and uniqueness of solutions of the proposed models. We examine the combined effects of an effective vaccination campaign and non-pharmaceutical measures such as lockdowns and states of emergency. We rely on the results of this research to assist policymakers in various countries in eradicating the illness by developing more innovative measures to control the outbreak.
文摘血液作为重要的资源,直接关系到患者生命健康和医疗业务活动连续性,鉴于其只能来自献血者的自愿捐赠,容易因外界各种因素影响而处于供应紧缺状态。本文作为介绍“英国血液紧缺应急计划”系列文章第一部分,旨在对英国应急管理体系,尤其是卫生应急管理的情况进行概述。本文阐述了英国的应急管理法规标准体系和机制体制、关于应急准备与实施指导意见的非法规性指导文件、以及负责应急协调与合作的跨部门多机构的地方韧性联席会议制度、英国政府能力建设、有关应急响应主体和应急指挥控制机制等内容;在此基础上,本文进一步详细介绍了英国卫生应急体系的法律基础和国家医疗服务体系(national health service,NHS)应急准备、韧性和响应(emergency preparedness,resilience and response,EPRR)核心标准体系,并列举了相应文件。
文摘为解决电力短缺引发的无章程断电控电问题,凸显第三方监督机构在紧急需求响应中的实际价值,以供电短缺为背景建立了包含电力市场调度中心(power market scheduling center, PMSC)的电力市场交易机制。首先,设计了PMSC的实时控电策略,即通过设置各时段的控电额度对用户低于基准用电量的部分给予实时激励补贴,并提出了PMSC侧的福利模型。其次,基于前景理论,讨论了供电环境风险差异对用户用电主观偏好的影响,以此构建了含心理预期状态指标的用电效用量化模型。最后,建立了包含供需两侧及PMSC的社会福利最大化模型,利用拉格朗日对偶理论并根据设计的实现利益三方互动的分布式算法对该问题进行求解。仿真结果表明:相同供电环境下,用户心理预期的降低表现出用电量减少且效用增加;在此基础上提出的紧急需求响应模型能够在感知用户心理状态随供电环境的变化下提升缺电场景中用户侧的福利并维持一定的系统发电裕度,且实时激励价格和电价表现合理。该研究为电网在紧急情况下实现需求响应常态化运营提供了系统性的理论指导和切实可行的决策框架。
文摘In this present paper, a deterministic lot size model is developed for deteriorating items with incremental quantity discounts. It is assumed that shortages are permitted to occur and fully backlogged. A simple solution procedure is shown for determining the optimal order lot size and the optimal order cycle. A numerical example is used to illustrate how the solution procedure works.
文摘Solar energy, as a renewable resource, is an effective solution to the current global energy shortage problem. To actively respond to the call for "carbon peak" and "carbon neutrality", solar cell industry has experienced unprecedented development. The full utilization of solar energy resources remains an urgent issue to be addressed.
