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Study on Agent Incentives for Resource Sharing on P2P Networks P2P网络中资源共享的代理激励研究
Pub Date : 2021-07-16 DOI: 10.1142/S0217595921500317
Yukun Cheng, Xiaotie Deng, Yuhao Li
There have recently been extensive studies on proportional response protocol, which is motivated by the successful BitTorrent system for file sharing over a P2P network. The proportional response protocol has been proved to be strategy-proof against weight cheating attacks and edge cheating attacks, in order to allocate a single type of resource on P2P networks. This strategy-proof property holds due to an elegant combinatorial structure: the bottleneck decomposition of the underlying network structure, and the utility function, defined as the total resources that one agent receives from its neighbors. However, Sybil attacks, under which an agent may form several fictitious players and split its resource among them, have been shown as a more difficult attack to defend against, and thus a strategic agent playing Sybil attacks may result in personal gain. Previous efforts have been made to show that an agent may generate a gain, but with limited gains by Sybil attacks on several special networks, including trees, cliques, and rings. This paper is the first to study the agent’s incentives by adopting a Sybil attack on general networks. The main contribution is to prove that any agent cannot obtain more than three times as much as the revenue when it plays honestly.
由于BitTorrent系统在P2P网络上文件共享的成功,近年来对比例响应协议进行了广泛的研究。为了在P2P网络上分配单一类型的资源,比例响应协议已被证明是抗权重欺骗攻击和边缘欺骗攻击的策略证明。这种不受策略影响的特性是由于一种优雅的组合结构:底层网络结构的瓶颈分解和效用函数,效用函数定义为一个代理从其邻居那里接收到的总资源。然而,Sybil攻击是一种更难以防御的攻击,在这种攻击下,一个代理可能会组建几个虚拟的参与者,并在他们之间分配资源,因此一个战略代理进行Sybil攻击可能会带来个人利益。以前的研究已经表明,一个代理可能会产生增益,但在Sybil攻击几个特殊网络(包括树、集团和环)时,增益有限。本文首次在一般网络中采用Sybil攻击来研究agent的激励。主要的贡献是证明任何经纪人在诚实的情况下都不能获得超过三倍的收入。
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引用次数: 0
How to Escape Supply Chain Dilemmas? Manufacturer Encroachment and Supplier Cost-Reduction Investment 如何摆脱供应链困境?制造商侵占与供应商成本降低投资
Pub Date : 2021-07-07 DOI: 10.1142/S0217595921400303
Qijun Wang, J. Nie, S. Xia
Component suppliers and manufacturers in a supply chain have long faced different dilemmas. The component supplier intends to adopt new technologies to reduce production costs, but the new technologies usually require significant investment costs. The encroachment into retailing can bring more revenue to manufacturers, but the significant costs of establishing and maintaining direct channels and the potential conflicting interests with the retailer might discourage the manufacturer’s encroachment. This study aims to address these dilemmas facing the component supplier and manufacturer by investigating an interesting scenario in which they both can obtain benefits. Within the given context, the manufacturer’s encroachment increases the order of the components, which motivates the supplier to make more technological investments to reduce production costs. The reduction of component costs enables suppliers and manufacturers to reduce the wholesale prices of components and final products. In this case, the manufacturer’s encroachment can benefit both the manufacturer and the retailer. This study is one of the first to investigate how the interaction between the manufacturer and supplier helps solve their respective dilemmas and provide benefits to the whole supply chain. Additionally, we extend the literature on manufacturer encroachment on retailers by considering supplier investment in cost-reduction production.
长期以来,供应链中的零部件供应商和制造商一直面临着不同的困境。元器件供应商有意采用新技术来降低生产成本,但新技术通常需要大量的投资成本。对零售业的入侵可以给制造商带来更多的收入,但是建立和维持直接渠道的巨大成本以及与零售商潜在的利益冲突可能会阻碍制造商的入侵。本研究旨在通过调查一个有趣的场景来解决组件供应商和制造商面临的这些困境,在这个场景中,他们都可以获得利益。在给定的环境下,制造商的入侵增加了零部件的顺序,这促使供应商进行更多的技术投资以降低生产成本。零部件成本的降低使供应商和制造商能够降低零部件和最终产品的批发价格。在这种情况下,制造商的侵犯对制造商和零售商都有利。本研究是第一个研究制造商和供应商之间的互动如何帮助解决各自的困境,并为整个供应链提供利益的研究之一。此外,我们通过考虑供应商在降低成本生产中的投资来扩展制造商对零售商的侵占。
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引用次数: 0
Two-Stage Heuristic Algorithm Proposal for Urban E-Commerce Deliveries 城市电子商务配送的两阶段启发式算法建议
Pub Date : 2021-07-06 DOI: 10.1142/s0217595921500342
M. Karaoğlu, G. Kara
In today’s intensive competition conditions, it is an inevitable necessity for the companies operating in the e-commerce sector to manage their physical distribution processes efficiently and effectively. The most important step in e-commerce logistics processes is the last step delivery operations in the city. In order for these operations to be carried out quickly and efficiently, delivery vehicles and personnel must be optimally led. These problems, referred to as vehicle routing problem (VRP) in the literature, include determining the least cost routes that vehicles will cover to meet customer needs. In this study, the urban delivery problems of the enterprises operating in the online retail sector are examined. In line with these problems, VRP for urban e-commerce deliveries has been modified; open, multi-depot, distribution aggregation, time-window VRP is discussed. A mathematical model for the modified VRP has been developed and a new heuristic algorithm consisting of two stages has been developed for large-scale problems. The developed algorithm was tested on three different cases. The results are compared with the solution of the nearest neighbor method and the performance of the proposed algorithm is presented.
在当今激烈的竞争条件下,对电子商务领域的公司进行高效有效的物流管理是必然的需要。电子商务物流过程中最重要的一步是在城市的最后一步交付操作。为了使这些行动迅速有效地进行,必须对运送车辆和人员进行最佳的领导。这些问题在文献中被称为车辆路线问题(VRP),包括确定车辆将覆盖的最低成本路线以满足客户需求。本研究考察了网络零售企业的城市配送问题。针对这些问题,对城市电商配送VRP进行了修改;讨论了开放式、多仓库、分布聚合、时间窗VRP。建立了改进VRP的数学模型,并提出了一种针对大规模问题的两阶段启发式算法。开发的算法在三种不同的情况下进行了测试。将结果与最近邻法的解进行了比较,并给出了该算法的性能。
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引用次数: 2
A Bicriteria Approach for Saving a Path Maximizing Dynamic Contraflow 一种保存路径的双准则方法最大化动态逆向流
Pub Date : 2021-06-28 DOI: 10.1142/S0217595921500275
H. Nath, S. Dempe, T. N. Dhamala
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引用次数: 2
Parallel Machine Scheduling with Due Date-to-Deadline Window, Order Sharing and Time Value of Money 并行机器调度与截止日期窗口,订单共享和时间价值的钱
Pub Date : 2021-06-28 DOI: 10.1142/S021759592150024X
Yin-Feng Xu, Rongteng Zhi, Feifeng Zheng, Ming Liu
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引用次数: 1
An Efficient Elite-Based Simulation-Optimization Approach for Stochastic Resource Allocation Problems in Manufacturing and Service Systems 制造与服务系统随机资源分配问题的高效精英仿真优化方法
Pub Date : 2021-06-21 DOI: 10.1142/S0217595921500305
Chun-Chih Chiu, James T. Lin
Stochastic resource allocation problems (SRAPs) involve determining the optimal configuration of a limited resource to achieve an objective function under given constraints and random effects in manufacturing systems (MSs) and service systems (SSs). The problems are traditionally solved by determining the optimal solution. It is generally preferable to determine as many global optima as possible, or at least a small set of diverse but good candidates, to help the decision-maker rapidly adopt alternative solutions from the set if one solution is unsuitable. However, many local or global optima occur in SRAPs in MSs and SSs due to the interaction between random system factors, such as processing time uncertainty and machine failure rates. Thus, enhancing the searching efficiency of algorithms for SRAPs is a challenge. This study proposes an efficient simulation–optimization approach, called elite-based particle swarm optimization (EPSO), using an optimal replication allocation strategy (ORAS) (i.e., EPSO[Formula: see text], to address three types of SRAPs from the literature. Three simulation models were constructed to evaluate the system performance under random factors. We developed a novel EPSO to explore and exploit the solution space. We created an elite group (EG) that includes multiple solutions, and each solution of the EG has a statistically nonsignificant difference from the current optimal solution. The new feature of EPSO updates the velocity and position of the particles in the design space based on multiple global optima from the EG to enhance diversity and prevent premature convergence. We propose an ORAS to allocate a limited number of replications to each solution. Three numerical experiments were performed to verify the effectiveness and efficiency of EPSO[Formula: see text] compared with other simulation–optimization approaches, namely particle swarm optimization (PSO) and the genetic algorithm (GA) with both optimal computing budget allocation (OCBA) and the ORAS. The experimental results reveal that the solution quality of EPSO improved compared with that of PSO and GA, and the ORAS provides a more efficient allocation of the number of replications compared with the OCBA in the three experiments. Finally, the proposed approach also provides an elite set at the end of the algorithm, instead of a single optimal solution, to support decision-making.
在制造系统和服务系统中,随机资源分配问题涉及在给定约束和随机效应下确定有限资源的最佳配置以实现目标函数的问题。传统上通过确定最优解来解决这些问题。通常最好确定尽可能多的全局最优,或者至少确定一组多样但良好的候选,以便在一个解决方案不合适的情况下帮助决策者迅速从一组解决方案中采用替代解决方案。然而,由于随机系统因素(如加工时间不确定性和机器故障率)之间的相互作用,在MSs和SSs中的srap中会出现许多局部或全局最优。因此,提高srap算法的搜索效率是一个挑战。本研究提出了一种高效的模拟优化方法,称为基于精英的粒子群优化(EPSO),该方法使用最优复制分配策略(ORAS)(即EPSO[公式:见文本])来解决文献中的三种类型的srap。建立了三个仿真模型来评估系统在随机因素下的性能。我们开发了一种新颖的EPSO来探索和利用解决方案空间。我们创建了一个包含多个解的精英组(EG), EG的每个解与当前最优解的差异在统计上不显著。EPSO的新特性是基于EG的多个全局最优来更新粒子在设计空间中的速度和位置,以增强多样性和防止过早收敛。我们建议使用ORAS为每个解决方案分配有限数量的副本。通过三个数值实验验证了EPSO[公式:见文本]与其他模拟优化方法(即粒子群优化(PSO)和遗传算法(GA)同时具有最优计算预算分配(OCBA)和ORAS)的有效性和效率。实验结果表明,与PSO和GA相比,EPSO的溶液质量有所提高,ORAS在三个实验中比OCBA更有效地分配了重复数。最后,该方法还在算法的最后提供了一个精英集,而不是单一的最优解,以支持决策。
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引用次数: 2
Efficiency Loss and Coordination in the Online Shopping Supply Chain with Competitive Shipping Companies 竞争航运公司网络购物供应链的效率损失与协调
Pub Date : 2021-06-21 DOI: 10.1142/S0217595921500251
Yihong Hu, Q. Qiang
This paper studies efficiency loss and coordination mechanism in a supply chain with one online retailer and multiple competitive shipping companies in the presence of congestion effects. We build a three-level game between customers, shipping companies and the retailer. The equilibrium market structure is determined. The optimal volume–investment ratio for each shipping company is the same for both centralized and decentralized supply chains, and it is dependent on the delivery time function, independent of competitors’ decisions. The efficiency loss of the decentralized supply chain with one retailer and one shipping company is found to be 1/4, independent of the delivery time function and the demand function. The loss is reduced when competition is introduced into shipping companies and an upper bound of efficiency loss with multiple homogeneous shipping companies is derived. Revenue-sharing contracts may be designed to allow the decentralized supply chain to perform as well as a centralized one. The necessity of coordination is reduced when competition is introduced and the number of competitive companies increases. Finally, we extend the model to consider heterogeneous shipping companies and find that the disparity between shipping companies increases the efficiency loss because in the decentralized supply chain less efficient shipping companies also provide service. This research explicates the relationship options between e-commerce retailers and shipping companies, providing managerial insights for industry practitioners.
本文研究了一个网络零售商和多个竞争航运公司存在拥塞效应的供应链的效率损失和协调机制。我们在顾客、运输公司和零售商之间建立了一个三级游戏。确定了均衡市场结构。对于集中式和分散式供应链,每个航运公司的最优体积投资比是相同的,并且它依赖于交货时间函数,独立于竞争对手的决策。发现一个零售商和一个运输公司的分散供应链的效率损失为1/4,与交货时间函数和需求函数无关。在航运公司中引入竞争可以减少损失,并推导出多个同质航运公司时效率损失的上界。收入共享合同可以设计成允许分散的供应链像集中的供应链一样运行。引入竞争,竞争企业增多,协调的必要性就会降低。最后,我们将模型扩展到考虑异构航运公司,发现航运公司之间的差异增加了效率损失,因为在分散的供应链中,效率较低的航运公司也提供服务。本研究阐明了电子商务零售商与航运公司之间的关系选择,为行业从业者提供管理见解。
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引用次数: 2
Demand Information Sharing in the Presence of B2B Spot Market B2B现货市场下的需求信息共享
Pub Date : 2021-06-21 DOI: 10.1142/s0217595921500329
Shanshan Ma, Liyan Wang
Companies have started to use a business-to-business (B2B) spot market in combination with their traditional long-term procurement contracts to procure intermediate goods. This study investigates whether or not the market players should share their demand forecast information with one another in a supplier — manufacturer supply chain and assess the benefits of sharing information in the presence of the B2B spot market. First, the supplier and manufacturer make forecast on the demand, and during this period they select an information-sharing arrangement, that is, whether to share information or not. Then, the supplier sets the wholesale price and the manufacturer submits an order after observing the wholesale price. Both the supplier and manufacturer can trade their intermediate goods in a B2B spot market. We find that the manufacturer can infer the supplier’s demand forecast from the wholesale price in the non-information-sharing case, but the supplier cannot enjoy such an advantage. We also find that information sharing benefits both the supplier and the manufacturer, if and only if demand and spot price are positively correlated and the supplier’s expectation of the manufacturer’s forecast is medium. By contrast, obtaining more demand forecast information can hurt supply chain players. Information sharing benefits the manufacturer but hurts the supplier when the supplier’s expectation of the manufacturer’s forecast is high. However, when the supplier’s expectation of the manufacturer’s forecast is low, information sharing benefits the supplier but hurts the manufacturer.
企业已经开始利用企业对企业(B2B)现货市场,结合传统的长期采购合同来采购中间产品。本研究探讨在供应商-制造商的供应链中,市场参与者是否应该彼此分享他们的需求预测信息,并评估在B2B现货市场存在的情况下共享信息的好处。首先,供应商和制造商对需求进行预测,并在此期间选择信息共享安排,即是否共享信息。然后,供应商设定批发价格,制造商在观察批发价格后提交订单。供应商和制造商都可以在B2B现货市场上交易他们的中间产品。我们发现,在非信息共享情况下,制造商可以从批发价格中推断出供应商的需求预测,但供应商不能享有这种优势。我们还发现,当且仅当需求和现货价格呈正相关且供应商对制造商预测的期望为中等时,信息共享对供应商和制造商都有利。相比之下,获得更多的需求预测信息可能会损害供应链参与者。当供应商对制造商预测的期望过高时,信息共享对制造商有利,但对供应商不利。然而,当供应商对制造商预测的期望较低时,信息共享对供应商有利,但对制造商不利。
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引用次数: 1
Fritz John Optimality Conditions for Interval-Valued Multi-Objective Functions Using gH-Symmetrical Derivative h -对称导数下区间值多目标函数的Fritz John最优性条件
Pub Date : 2021-06-16 DOI: 10.1142/S0217595921500299
Sachin Rastogi, Akhlad Iqbal, Sanjeev Rajan
In this paper, we introduce the concept and applications of gH-symmetrical derivative for interval-valued multi-objective functions, which is the generalization of generalized Hukuhara derivative (gH-derivative). By a suitable example it has been shown that gH-symmetrically derivative is an extension of gH-derivative. Furthermore, we apply this new derivative to investigate the Fritz John type optimality conditions for interval-valued multiobjective programming problems. We use LR type of order relation in this context.
本文介绍了区间值多目标函数的h -对称导数的概念及其应用,它是广义Hukuhara导数(gh -导数)的推广。通过一个适当的例子证明了h -对称导数是h -导数的推广。进一步,我们应用这个新导数研究了区间值多目标规划问题的Fritz John型最优性条件。在这种情况下,我们使用LR类型的顺序关系。
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引用次数: 1
The Incentive Study in the Blockchain Era: A Two-Period Strategic Inventory Game 区块链时代的激励研究:一个两期战略库存博弈
Pub Date : 2021-06-16 DOI: 10.1142/S0217595921400248
Jianheng Zhou, Qingying Li
In this paper, we conduct an incentive study on the adoption of the blockchain technology in a two-period model with retailer’s use of strategic inventory. Without the adoption of the blockchain technology, the retailer has private information regarding the market size. We investigate the retailer’s voluntary signaling decisions via his pricing and strategic inventory decisions. We determine the retailer’s equilibrium price and the manufacturer’s optimal wholesale price. Both separating and pooling equilibria are discussed, and the unique lexicographically maximum sequential equilibrium is identified. With the adoption of the blockchain technology, there is no information asymmetric between the supply chain members. We find that the manufacturer has the incentive to adopt the blockchain technology when the demand uncertainty is moderate to high, and the retailer has the incentive to adopt the blockchain technology when the demand uncertainty is low or high. When the manufacturer and the retailer have a misalignment in the adoption of the technology, a central planner can help to achieve coordination.
在本文中,我们对零售商使用战略库存的两期模型中采用区块链技术进行了激励研究。在没有采用区块链技术的情况下,零售商拥有有关市场规模的私人信息。我们通过零售商的定价和战略库存决策来研究其自愿信号决策。我们确定零售商的均衡价格和制造商的最优批发价格。讨论了分离均衡和池化均衡,并确定了唯一的字典最大序贯均衡。采用区块链技术,供应链成员之间不存在信息不对称。我们发现,当需求不确定性为中高时,制造商有采用区块链技术的动机,当需求不确定性为低或高时,零售商有采用区块链技术的动机。当制造商和零售商在采用技术方面出现偏差时,中央计划器可以帮助实现协调。
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引用次数: 0
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Asia Pac. J. Oper. Res.
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