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基于凸情形下在线设备更新问题的竞争分析

系统工程理论与实践 2009年第11期29卷 145-151页

作者：辛春林陈剑刘天亮北京化工大学经济管理学院北京100029 清华大学经济管理学院北京100084

市场以在线的方式给出新设备,决策者必须决定是否更新现有的设备,并确定何时更新?即在已知现在和过去的设备信息和订单信息而对未来信息一无所知情况下,决策如何更新设备完成陆续达到的订单需求.优化目标是使设备更新投资成本与设备运... 详细信息

市场以在线的方式给出新设备,决策者必须决定是否更新现有的设备,并确定何时更新?即在已知现在和过去的设备信息和订单信息而对未来信息一无所知情况下,决策如何更新设备完成陆续达到的订单需求.优化目标是使设备更新投资成本与设备运行成本总和最小.首先讨论了离线设备更新问题,给出了两种算法并分析了算法复杂度.其后,讨论了凸情形下在线设备更新问题,给出了临界值策略,得出了竞争比为6,证明该策略要优于原有的策略.

关键词：在线问题设备更新竞争分析竞争比

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虚拟企业中核心能力的定性与定量识别

系统工程理论与实践 2002年第5期22卷 48-54页

作者：冯蔚东陈剑清华大学经济管理学院北京100084 清华大学现代管理研究中心北就100084

首先对企业核心能力的概念进行了辨析和界定 ,给出了一个识别核心能力的定性框架 .进一步地 ,根据虚拟企业组建过程的需要 ,提出了一个基于模糊聚类的伙伴企业核心能力的定量识别方法 .最后 ,给出了一个简化的仿真算例。

关键词：虚拟企业核心能力定性定量识别

Technical Notes:STUDIES ON THE VALUE OF SECONDARY MARKET TO THE SUPPLY CHAIN

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Systems Science and Systems Engineering 2003年第3期12卷 360-371页

作者： Ju-liang ZHANG jian chenDepartment of {2. Science and Engineering{3. of economics and {2. Tsinghua university, beijing 100084, China. Tsinghua university Department of Management Science and Engineering School of Economics and Management Beijing China (GRID:grid.12527.33) (ISNI:***)

This paper investigates the impact of a secondary market, where retailers can buy and sell excess inventories, on the supply chain. We develop a two-period model with a single manufacturer and two retailers. At the beginning of the first period the retailers order and receive products from the manufacturer, but at the beginning of the second period, they can trade surplus products between themselves in the secondary market. We investigate the impact of the correlated dependence of retailers' demand on both the quantity effect and the allocation effect under the secondary market. Lastly, we study potential strategies for the manufacturer to increase sales with the existence of the secondary market.

关键词： Supply chain secondary market exchanges market equilibrium

Research on the Technology of Virtual Data Private Network Based on 3. Network

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Research on the Technology of Virtual Data Private Network B...

基于Swarm的供应链多主体聚集模型及其仿真

2.10 The 3.d International Conference on Computational Intelligence and Industrial Application (PACIIA2.10)

作者： jian Shen 1 school of {2. and {3. beijing university of Posts and Telecommunications beijing ChinaShoulian Tang 2.school of {2. and {3. beijing university of Posts and Telecommunications beijing China Yonggang Wang 3.school of {2. and {3. beijing university of Posts and Telecommunications beijing China

During recent years,with the development of enterprises informatization,telecom operators are demanded to provide a more flexible network *** the development of 3. service,the technology of virtual data private network（short for VDPN in this paper） provided by telecom operators based on mobile network and fixed network has been accepted gradually by enterprise *** to the features of VDPN,this paper has designed the overall system structure of VDPN,illustrated two different modes of access,and provided a new mode of access by comparing the two modes *** new mode can enhance the operating efficiency and security of the virtual data private network.

关键词： Virtual Network APN VPDN 3.

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系统仿真学报 2004年第6期16卷 1308-1313页

作者：周庆陈剑清华大学经济管理学院北京100084

供应链是一类典型的复杂适应系统,本文采用一种高级Petri网方法建立基于多主体的供应链模型,着重论述通过子主体代换建立多主体聚集模型的方法与步骤,并给出多主体聚集模型实例。最后,建立了供应链配送渠道系统简化模型,设计了相应的仿... 详细信息

供应链是一类典型的复杂适应系统,本文采用一种高级Petri网方法建立基于多主体的供应链模型,着重论述通过子主体代换建立多主体聚集模型的方法与步骤,并给出多主体聚集模型实例。最后,建立了供应链配送渠道系统简化模型,设计了相应的仿真参数,通过Swarm仿真平台模拟了供应链配送渠道系统的动态组合行为,并对仿真结果进行了分析。

关键词：聚集模型多主体复杂适应系统供应链 Swarm仿真平台

FEEDBACK OF CONTRACTS EFFORTS IN THREE TIERS SUPPLY CHAINS

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FEEDBACK OF CONTRACTS EFFORTS IN THREE TIERS SUPPLY CHAINS

An Improved Distortion Operator for Insurance Risks

The Fourth International Conference on Systems Science and Systems Engineering(ICSSSE’03.

作者： Ding Ding school of economics and {2. Tsinghua {3. beijing 100084,P.R.China jian chen school of economics and {2. Tsinghua {3. beijing 100084,P.R.China

We address three tiers supply chains selling short-life cycle products which consisting of a supplier,a manufacturer (or distributor) and a retailer facing uncertain price-dependent *** first,the wholesale price from the supplier to the manufacturer is *** manufacturer chooses his sales price to the retailer and the retailer need to decide his order quantity and sales prices to the final ***,the manufacturer can introduce contracts to coordinate the two tiers supply chain contained himself and the retailer to improve their *** retailer will order more when the contract goes into ***,the supplier can sale more products (or components) and benefits from the external effort of the contracts in which he does not *** the business cycle repeated,the supplier will attempt to change his wholesale price to maximize his own profit,which contrary affects the contracts effort to the downstream *** phenomena are called feedback of contracts efforts in this paper,which is seldom studied in the former contracts literatures as most of them only consider two tiers supply *** develop models to analyze such feedback in this paper.

关键词： Supply Chain Contracts Coordination Feedback

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Systems Science and Systems Engineering 2002年第3期11卷 296-301页

作者： GAO jian-wei, QIU Wan-huaschool of {2. & {3., beijing university of Aeronautics and Astronautics, beijing 100083. China school of economics & {2. Beijing University of Aeronautics and Astronautics Beijing 100083 China

This paper reviews the distortion function approach developed in the actuarial literature for insurance risks. The main aim of this paper is to derive an extensive distortion operator, and to propose a new premium principle based on this extensive distortion operator. Furthermore, the non-robustness of general distortion operator is also discussed. Examples are provided using Bernoulli, Pareto, Lognormal and Gamma distribution assumptions.

关键词： proportional hazards transform distortion operator non-robustness

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新能源分布式发电系统的控制策略

太阳能学报 2006年第7期27卷 704-708页

作者：王健康龙云曹秉刚王昆清华大学汽车工程系汽车安全与节能国家重点实验室西安交通大学机械电子工程系天津职业大学经济与管理学院

针对新能源分布式发电系统提出了一种新的能量控制策略。基于飞轮储能系统里矢量控制的感应电机,建立了系统的数学模型。在系统里,采用模糊控制算法实现直流总线电压的自动调整,达到稳定系统的直流总线电压的目的。实验结果证明,在风力... 详细信息

针对新能源分布式发电系统提出了一种新的能量控制策略。基于飞轮储能系统里矢量控制的感应电机,建立了系统的数学模型。在系统里,采用模糊控制算法实现直流总线电压的自动调整,达到稳定系统的直流总线电压的目的。实验结果证明,在风力发电和飞轮储能联合系统的能量控制过程中使用模糊控制算法,实现了能量的快速存储和释放,起到了稳定系统电压的作用,取得了满意的控制效果。

关键词：新能源分布式发电模糊控制能量控制

Quantifying the impacts of COVID-19 on Sustainable Development Goals using machine learning models

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Fundamental Research 2024年第4期4卷 890-897页

作者： chenyang Shuai Bu Zhao Xi chen {2.guo Liu Chunmiao Zheng Shen Qu {2.-Ping Zou Ming xu school of management Science and Real Estate Chongqing UniversityChongqing 400044China bschool for Environment and Sustainability University of MichiganAnn ArborMI 489United Stats Michigan Institute for Computational Discovery&Engineering University of MichiganAnn ArborMI 48109United States College of economics and management Southwest UniversityChongqing 400044China Center for Systems Integration and Sustainability Department of Fisheries and WildlifeMichigan State UniversityEast LansingMI 48824United States Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China school of management and {2. Beijing Institute of TechnologyBeijing 100081China Center for Energy&Environmental Policy Research Beijing Institute of TechnologyBejing 100081China Key Laboratory of jiangxi Province for Persistent Plutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China Department of Civil and Environmental Engineering University of MichiganAnn ArborMI 48109United States

The COvID-19 pandemic has posed severe threats to global sustainable ***,a comprehensive quantitative assessment of the impacts of COVID-19 on Sustainable Development Goals(SDGs)is still *** research quantified the post-COVID-19 SDG progress from 2.2. to 2.2. using projected GDP growth and population and machine learning models including support vector machine,random forest,and extreme gradient *** results show that the overall SDG performance declined by 7.7%in 2.2. at the global scale,with 12.socioeconomic SDG performance decreasing by 3.0%-2..3.and 4 environmental SDG performance increasing by 1.6%-9.2..By 2.2.,the progress of 12.SDGs will lag behind for one to eight years compared to their pre-COVID-19 trajectories,while extra time will be gained for 4 environment-related ***,the pandemic will cause more impacts on countries in emerging markets and developing economies than those on advanced economies,and the latter will recover more quickly to be closer to their pre-covID-19 trajectories by ***-COVID-19 economic recovery should emphasize in areas that can help decouple economic growth from negative environmental *** results can help government and non-state stakeholders identify critical areas for targeted policy to resume and speed up the progress to achieve SDGs by 2.3..

关键词： Sustainable development goals COVID-19 Machine learning Global development Sustainable development assessment