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OUTSOURCE TO AN OEM OR AN ODM？ PROFITABILITY AND SUSTAINABILITY ANALYSIS OF A FASHION SUPPLY CHAIN

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Journal of Systems Science and Systems Engineering 2018年第4期27卷 399-416页

作者： baozhuang niu Yaoqi Liu Lei Chen Ping Ji School of Business Administration South China University of Technology Guangzhou 510640 China Department of Industrial and Systems Engineering the Hong Kong Polytechnic University Kowloon Hong Kong China

Consider a fashion supply chain comprising a supplier, a contract manufacturer and a fashion brand, we examine the fashion brand＇s profit performances when the contract manufacturer is either an OEM （having no design capability） or an ODM （having design capability）. Regarding OEM, the fashion brand designs the products, outsources the manufacturing function, and has the option of outsourcing procurement function. Regarding ODM, the fashion brand buys unlabeled products from the ODM, which is charge of designing and manufacturing. In this case, buy-back contract is widely adopted so as to share the risk of demand uncertainty between the ODM and the fashion brand. We solve the wholesale pricing problems via sequential/simultaneous optimization, and derive the buy-back price via generalize Nash bargaining. We find that, fashion brand prefers contracting with an ODM when its bargaining power in buy-back negotiation is larger than a threshold, although the fashion brand＇s order size under ODM is always larger than that under OEM. Interestingly, we find that the buy-back price is decreasing in the fashion brand＇s bargaining power. We further analyze the supply chain sustainability in both ODM and OEM scenarios, fmding that the supply chain might achieve both environmental sustainability and economic sustainability in OEM scenario when the fashion brand＇s bargaining power in buy-back negotiation is small.

关键词： Outsourcing buy-back contract fashion supply chain Nash bargaining

产品与物流服务双维竞争下品牌商的跨境包邮策略研究

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系统工程理论与实践 2022年第4期42卷 1013-1025页

作者：牛保庄陈凌云李启洋华南理工大学工商管理学院广州510641

在跨境电商中,包邮服务连同产品价格对消费者购买决策产生共同影响.当品牌商提供包邮时,它将一并承担跨境运费和进口关税;否则,这些费用将由消费者支付.基于此,本文考虑产品和物流服务双维竞争,针对同一跨境电商平台中品牌商A和B的包邮... 详细信息

在跨境电商中,包邮服务连同产品价格对消费者购买决策产生共同影响.当品牌商提供包邮时,它将一并承担跨境运费和进口关税;否则,这些费用将由消费者支付.基于此,本文考虑产品和物流服务双维竞争,针对同一跨境电商平台中品牌商A和B的包邮(F)或不包邮(N)决策,构建了四种策略组合下的模型,探讨品牌商的包邮策略选择问题.对比不同策略组合下的均衡结果,发现物流服务费用差异及产品差异对品牌商的决策起决定性作用.当产品差异较大时,品牌商A和B之间将出现(N,N)、(N,F)、(F,F)三种均衡策略,具体均衡策略的出现由消费者直接承担的物流服务费用决定.反之,当产品差异较小时,二者的均衡策略为(N,N)、(F,F).本文还发现关税税率的变化将会显著影响各种均衡策略形成的可能性,关税税率提高驱使品牌商选择趋同的包邮策略,即(N,N)、(F,F)更可能出现.这体现出跨境场景中关税对企业决策的独特作用.

关键词：双维竞争进口关税跨境包邮均衡策略

考虑供应中断的关键进口零部件本土替代及采购策略调整

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系统工程理论与实践 2022年第11期42卷 2881-2890页

作者：牛保庄许浩涛李启洋沈子凡华南理工大学工商管理学院广州510641

全球供应链体系下,愈加复杂的经济和政治形势增加了芯片等关键零部件出现供应中断的可能性.如何通过本土替代和供应链结构调整应对不确定性,增强供应链稳健性,已成为重要研究问题.本文抓住供应链结构调整的关键因素,构建了由跨境供应商... 详细信息

全球供应链体系下,愈加复杂的经济和政治形势增加了芯片等关键零部件出现供应中断的可能性.如何通过本土替代和供应链结构调整应对不确定性,增强供应链稳健性,已成为重要研究问题.本文抓住供应链结构调整的关键因素,构建了由跨境供应商、本土供应商、两个相互竞争的品牌商组成的博弈模型,研究存在跨境供应中断可能性时,中国品牌商是否有动机与本土供应商合作,采取双源采购策略保障供应稳定.结果表明,订单分配比例和跨境供应中断概率会显著影响中国品牌商的采购策略偏好.当订单分配比例较均匀时,订单分散性诱使上游供应商制定更高的批发价格,从而增加了中国品牌商的采购成本,此时单源采购策略较优.进一步研究发现,其他供应链成员是否偏好中国品牌商的双源采购主要与跨境中断概率有关.

关键词：供应中断供应链稳健性渠道结构调整采购策略

Design and Verification of Parallel Hip Exoskeleton Considering Output Torque Anisotropy

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Journal of Bionic Engineering 2024年第3期21卷 1305-1320页

作者： Jilong Xu Yunzhan niu Fucai Liu Engineering Research Center of the Ministry of Education for Intelligent Control System and Intelligent Equipment Yanshan UniversityQinhuangdao066004China Key Laboratory of Industrial Computer Control Engineering of Heibei Province Yanshan UniversityQinhuangdao066004China College of Mechanical Engineering Yanshan UniversityQinhuangdao066004China

In rehabilitation training,it is crucial to consider the compatibility between exoskeletons and human legs in ***,most exoskeletons today adopt an anthropomorphic serial structure,which results in rotational centers that are not precisely aligned with the center of the hip *** address this issue,we introduce a novel exoskeleton called the Parallel Hip Exoskeleton(PH-Exo)in this ***-Exo is meticulously designed based on the anisotropic law of output *** the friction of the drive components,a dynamic model of the human-machine complex is *** analysis demonstrates that PH-Exo not only exhibits outstanding torque performance but also achieves high controllability in both flexion/extension and adduction/abduction ***,a robust controller is designed to address model uncertainty,friction,and external *** experiments indicate that under the control of the robust controller,each motor achieves excellent tracking performance.

关键词： Hip exoskeleton Parallel mechanism Misalignment Anisotropy Output torque

An Asynchronous Variational Integrator for Contact Problems Involving Elastoplastic Solids

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Acta Mechanica Solida Sinica 2024年第2期37卷 305-315页

作者： Zongwu niu Zixiao Wang Yongxing Shen University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai200240China School of Agriculture and Biology Shanghai Jiao Tong UniversityShanghai200240China Department of Biostatistics Johns Hopkins Bloomberg School of Public HealthBaltimoreMaryland21205USA

Simulations of contact problems involving at least one plastic solid may be costly due to their strong nonlinearity and requirements of *** this work,we develop an explicit asynchronous variational integrator(AVI)for inelastic non-frictional contact problems involving a plastic *** AVI assigns each element in the mesh an independent time step and updates the solution at the elements and nodes *** asynchrony makes the AVI highly efficient in solving such bi-material *** advantage of the AVI,the constitutive update is locally performed in one element at a time,and contact constraints are also enforced on only one *** time step of the contact element is subdivided into multiple segments,and the fields are updated *** a contact event,only one element involving a few degrees of freedom is considered,leading to high *** proposed formulation is first verified with a pure elastodynamics benchmark and further applied to a contact problem involving an elastoplastic solid with non-associative volumetric *** numerical results indicate that the AVI exhibits excellent energy behaviors and has high computational efficiency.

关键词： Asynchronous variational integrator Plasticity Contact Computational efficiency Finite element method

Vascularization ability of glioma stem cells in different three-dimensional microenvironments

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Regenerative Biomaterials 2024年第1期3卷 34-43页

作者： Xuanzhi Wang Tao Xu Chaoshi niu Department of Neurosurgery The First Affliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefeiAnhui230036China Department of Neurosurgery Sichuan Provincial People's HospitalUniversity of Electronic Science and Technology of ChinaChengdu 610072People's Republic of China Center for Bio-intelligent Manufacturing and Living Matter Bioprinting Research Institute of Tsinghua University in ShenzhenTsinghua UniversityShenzhen 518057People's Republicof China

Glioblastoma(GBM)is among the most common and aggressive adult central nervous system *** prominent charac-teristic of GBM is the presence of abnormal microvessels.A significant correlation between angiogenesis and prognosis has been *** reconstructing this neovascula-rization and tumor microenvironment through personalized in vitro disease models presents a significant ***,it is crucial to develop new anti-angiogenic therapies for *** this study,3D bioprinted glioma stem cell(GSC)-laden hydrogel scaffolds,hybrid Gsc hydrogels and ceil-free hydrogel scaffolds were manufactured to investigate the vas-cularization ability of GsCs in varying 3D microenvironments.

关键词： 3D bioprinting xenograft tumors GSC-laden hydrogel scaffold glioblastoma angiogenesis

An integrative mathematical model of microwave ion thruster for mHz-frequency thrust noise analysis

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Chinese Journal of Aeronautics 2024年第4期37卷 121-136页

作者： Xiang niu Hui LIU Daren YU Plasma Propulsion Laboratory Harbin Institute of TechnologyHarbin 150001China

Many high-precision space missions need thrusters to produce thrust with low noise to compensate for disturbances and ensure satellite platform stability. Microwave ion thruster is characterized with a wide thrust range and potential for these missions. A cost-effective and accurate mathematical model is crucial for mHz-frequency thrust noise analysis and feedback controller design. The Particle-In-Cell(PIC) and global models are two common simulation tools. The PIC model is characterized with high accuracy but huge computation cost, which is difficult to analyze long-time performance characteristics. Now, the global model is only used for the discharge chamber with low accuracy and cannot reflect ion extraction properties. In this paper, an integrative mathematical model is built for a 1-cm microwave ion thruster and can reflect ion beamlet divergence and impingement on the Accelerator Grid(AG). Simulation results show good agreement with experiments at 0.06 sccm. However, the model demonstrates worse consistency with experiments when the flux increases to 0.1 sccm, which may be because the influence of neutral gas on the Electron Cyclotron Resonance(ECR) is not considered in the model. A long-time(1000 s) simulation is conducted with this model under 35 μN. It takes 3 hrs, and the thrust noise reaches 1 μN/Hz^(0.5) at 1 mHz.

关键词： Electric propulsion Microwave ion thruster Integrative model Sheath property Ion beamlet divergence Thrust noise Plasma

Event-triggered sliding mode control of linear repetitive processes and its application in metal rolling process

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Science China(Information Sciences) 2024年第3期67卷 167-181页

作者： Xinyu LV Yugang niu James LAM Key Laboratory of Smart Manufacturing in Energy Chemical Process (East China University of Science and Technology) Ministry of Education Department of Mechanical Engineering The University of Hong Kong

This paper investigates the design problem of a sliding mode controller for linear repetitive processes(LRPs) with a finite pass length on each pass. Under limited communication resources, an eventtriggered mechanism is implemented from the sensors to the controller, whose triggered sequence is consistent with the evolution direction of LRPs. To periodically orchestrate communication between the controller and actuator, a round-robin scheduling mechanism is established based on the pass length. A sliding function involving the state and pass profile is constructed, and the sliding mode controller is designed using triggered states and pass profile signals. Feasible controller gains are attained to ensure the stability of the resultant closed-loop system. Finally, the proposed strategy is implemented for a multi-roll metal rolling process.

关键词： event-triggered mechanism linear repetitive processes metal rolling process round-robin scheduling sliding mode control

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Bilayer solid-electrolyte interphase structure enables a 440 Wh kg^(-1) lithium metal pouch cell to achieve 130 cycles

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Science China Chemistry 2024年第3期67卷 751-752页

作者： Xiong Liu Chaojiang niu School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Lithium(Li) metal has been considered one of the most promising anodes due to its high theoretical capacity, lightweight and low electrochemical potential. The cell-level energy density of rechargeable lithium metal batteries(LMBs) is expected to surpass 500 Wh kg^(-1) after replacing the graphite anode in lithium-ion batteries [1].

关键词： lithium electrolyte layer