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Selecting wood supply contracts under uncertainty using stochastic programming 用随机规划方法选择不确定条件下的木材供应合同
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-08-09 DOI: 10.1080/03155986.2020.1800975
Alireza Rahimi, M. Rönnqvist, L. Lebel, J. Audy
Abstract A large portion of expenses in the forest industries is associated with wood supply procurement. Numerous suppliers are involved and securing wood supply contracts with competitive prices is a constant challenge for procurement managers. A major difficulty is the procurement exposure to various sourcing risks including the start of the spring thaw, contract breach, or unreliability of suppliers. A procurement plan should anticipate random events and include measures that counter their negative impact. Recourse actions must be planned by considering volume uncertainty and wood price fluctuations. Relying on manual tools is hardly capable of considering all aspects of this problem. A stochastic programming approach is proposed to support the development of a procurement plan. In this model, several types of contracts including fixed, flexible and option contracts with different durations are included. The proposed selection of contracts from a stochastic programming model yields average optimality in the presence of plausible scenarios. The developed two-stage stochastic programming model decides on the selection of the optimal portfolio of contracts to minimize total procurement costs. Based on a case study in Quebec, an average saving of 4% was shown by using stochastic programming compared to the deterministic approach.
森林工业的大部分费用与木材供应采购有关。有许多供应商参与其中,以有竞争力的价格获得木材供应合同是采购经理面临的一个持续挑战。一个主要的困难是采购面临各种采购风险,包括春季解冻的开始、合同违约或供应商不可靠。采购计划应预见到随机事件,并包括抵消其负面影响的措施。在计划追索行动时,必须考虑到数量的不确定性和木材价格的波动。依靠手工工具很难考虑到这个问题的所有方面。提出了一种支持采购计划制定的随机规划方法。在该模型中,包含了不同期限的固定合同、弹性合同和期权合同。从一个随机规划模型中提出的契约选择在可能的情况下产生平均最优性。所建立的两阶段随机规划模型决定了以总采购成本最小为目标的最优合同组合的选择。根据魁北克的一个案例研究,与确定性方法相比,使用随机规划平均节省4%。
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引用次数: 1
Consumer returns in consignment contracts with inventory control and additive uncertainty 具有库存控制和附加不确定性的寄售合同中的消费者回报
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-08-04 DOI: 10.1080/03155986.2020.1796065
M. Bieniek
Abstract Consignment is a form of business arrangement, in which a vendor places goods at a retailer’s location without receiving payment until the products are sold. This paper examines consignment with consumer non-defective returns behaviour, where the upstream vendor makes a contract with the downstream retailer. The vendor decides what the consignment and refund prices are, and the retailer chooses the retail price. The vendor gets paid based on the sold units, salvages and returns. We analyze two contracts, called retailer and vendor managed consignment inventory (RMCI and VMCI, respectively), the only difference being that under RMCI, the retailer chooses the service level, and under VMCI, the vendor specifies it. We present precise solutions to VMCI for additive uncertainty and compare them to the multiplicative case. We prove that the vendor’s optimal return policy depends on a salvage value since if it is equal to zero, the vendor should not offer the return policy. We show that the channel may gain profit from the return policy for the positive salvage value. We demonstrate that the form of uncertainty and the presence of consumer returns considerably affect the solutions to the problems. As an extension, we give the results obtained under RMCI.
寄售是一种商业安排形式,在这种安排中,供应商将货物放在零售商的位置,直到产品销售出去才收到付款。本文研究了具有消费者无缺陷退货行为的寄售,其中上游供应商与下游零售商签订了合同。供应商决定寄售和退款价格,零售商选择零售价格。卖方根据售出的单位、打捞物和退货获得报酬。我们分析了两个契约,分别称为零售商和供应商管理的寄售库存(分别为RMCI和VMCI),唯一的区别是,在RMCI下,零售商选择服务水平,而在VMCI下,供应商指定服务水平。我们给出了加性不确定性的VMCI的精确解,并将其与乘法情况进行了比较。我们证明了供应商的最优退货策略依赖于残值,因为如果残值等于零,供应商不应该提供退货策略。我们表明,渠道可以从积极的残值退货政策中获得利润。我们证明了不确定性的形式和消费者退货的存在对问题的解决有很大的影响。作为推广,我们给出了在RMCI下得到的结果。
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引用次数: 1
Elective course assignment problem: a revenue management based approach 选修课作业问题:基于收益管理的方法
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-07-23 DOI: 10.1080/03155986.2020.1796064
Armagan Ozbilge, Aydin Ulucan, Kazim Baris Atici
Abstract The current paper aims to provide a novel approach for the assignment of students to elective courses using historical records of course capacities and student demand. With this aim, we establish a link between the course assignment problem and the airline seat allocation modeling of Revenue Management. An analogy is set up relying on the assumption that the students form distinct groups and intend to enroll in the elective courses with limited capacities, which is similar to different classes of customers to purchase tickets for the flights with limited capacities. We illustrate the proposed idea in a real-world case utilizing the historical demand and capacity data of a public university in which the senior students have priority in enrolling. The results of the proposed modeling can serve not only for capacity allocations to the courses but also offers suggestions to evaluate the potential capacity augmentation or reduction decisions.
摘要本论文旨在提供一种利用课程容量和学生需求的历史记录来分配学生选修课程的新方法。为此,我们建立了课程分配问题与收益管理的航空公司座位分配模型之间的联系。假设学生组成不同的群体,并打算选修有限容量的选修课,这类似于不同类别的客户购买有限容量航班的机票。我们利用一所公立大学的历史需求和容量数据,在一个现实世界的案例中说明了所提出的想法,其中高年级学生具有入学优先权。所建议的建模结果不仅可以为课程的容量分配提供服务,还可以为评估潜在的容量增加或减少决策提供建议。
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引用次数: 0
Joint pricing and lot sizing model with statistical inspection and stochastic lead time 具有统计检验和随机交货期的联合定价和批量模型
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-07-20 DOI: 10.1080/03155986.2020.1794227
Maryam Safarnezhad, M. Aminnayeri, R. G. Yaghin
Abstract In many real-world situations, there are a fraction of defective items in a received lot whose quality should be evaluated before storage. In this article, we address the joint ordering, pricing, and inspection planning problem for a retailer facing price-sensitive demand and stochastic supply lead-time. The fraction of nonconforming items in a received lot follows a beta distribution and the buyer considers different kinds of inspection policies that include no inspection, inspection and sampling. Moreover, a novel non-linear optimization model is developed in order to determine optimal ordering, pricing and inspection policies. An analytical solution procedure based on mathematical properties of the model is proposed to find optimal decision variables. Numerical studies are conducted in order to show the applicability of the developed model and effectiveness of the proposed algorithms.
在许多实际情况下,在收到的批次中有一小部分次品在入库前应进行质量评估。在这篇文章中,我们讨论了面对价格敏感需求和随机供应提前期的零售商的联合订货、定价和检验计划问题。收到的批次中不合格品的比例遵循beta分布,买方考虑不同的检验政策,包括不检验、检验和抽样。此外,为了确定最优的订货、定价和检验策略,建立了一种新的非线性优化模型。提出了一种基于模型数学性质的解析求解方法,以寻找最优决策变量。为了证明所建立模型的适用性和所提出算法的有效性,进行了数值研究。
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引用次数: 1
The changing landscape of supply chain networks: an empirical analysis of topological structure 供应链网络格局的变化:拓扑结构的实证分析
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-07-20 DOI: 10.1080/03155986.2020.1785263
P. Orenstein
Abstract Supply chain networks are complex and often proprietary, which implies that on the most part, the structure of a company’s supply chain is not well known nor accessible. This research investigates supply chain network topology, properties and supply network evolution using a data-driven approach. The key idea is to construct a sample set of data from a financial source and examine it in the context of supply network topology. This represents a new direction, since, while financial data has been applied by researchers to explore financial relationships in a supply chain, the application of this data source to determine the underlying topological characteristics is still in its infancy. As a starting point, we create a sample of supply networks from the retail industry sector (two from home improvement industry and one from the sporting goods industry). We expect that the retail industry will provide a rich and dynamic source of representative data for a typical supply chain network. We use the sample data sets to identify specific topological characteristics (for example, average degree, network diameter, average path length, and degree exponent) which help explain the evolution and dynamics of a modern supply network. Using these identified characteristics, our plan is to expand the selection to cover additional networks over a wider time-span in order to generalize the findings.
供应链网络是复杂的,通常是专有的,这意味着在大多数情况下,公司的供应链结构不是众所周知的,也不是很容易接近的。本研究使用数据驱动的方法研究供应链网络的拓扑结构、特性和供应网络的演变。关键思想是从财务来源构建一组样本数据,并在供应网络拓扑的背景下对其进行检查。这代表了一个新的方向,因为虽然研究人员已经应用财务数据来探索供应链中的财务关系,但应用该数据源来确定潜在的拓扑特征仍处于起步阶段。作为起点,我们创建了一个零售行业供应网络样本(两个来自家装行业,一个来自体育用品行业)。我们期望零售业能为典型的供应链网络提供丰富而动态的代表性数据来源。我们使用样本数据集来识别特定的拓扑特征(例如,平均度、网络直径、平均路径长度和度指数),这些特征有助于解释现代供应网络的演变和动态。利用这些已确定的特征,我们的计划是扩大选择范围,在更大的时间跨度内覆盖其他网络,以便概括研究结果。
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引用次数: 4
Asymmetric distance location model 不对称距离定位模型
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-07-16 DOI: 10.1080/03155986.2020.1789386
T. Drezner, Z. Drezner
Abstract In this note, we analyze location problems where the distance (time) to get to the destination by air is affected by winds. We propose two models: the asymmetric Weber location problem and the round-trip Weber location problem. The problems are analyzed and solved.
在这篇文章中,我们分析了由空气到达目的地的距离(时间)受风影响的定位问题。本文提出了两个模型:不对称韦伯定位问题和往返韦伯定位问题。对问题进行了分析和解决。
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引用次数: 5
A hybrid nested partitions and simulated annealing algorithm for dynamic facility layout problem: a robust optimization approach 动态设施布局问题的混合嵌套分区和模拟退火算法:一种鲁棒优化方法
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-07-06 DOI: 10.1080/03155986.2020.1788328
Leila Khajemahalle, S. Emami, R. N. Keshteli
Abstract The dynamic facility layout problem (DFLP) deals with the arrangement of facilities/departments in a factory for different periods so that the location of the facilities can be changed from one period to another one. Traditionally, this problem is formulated to minimize the sum of material handling and rearrangement costs in the planning horizon by assuming that all parameters are deterministic. In this paper, we assume that the material flow between departments and rearrangement costs are uncertain and, accordingly, develop the robust counterpart (RC) of the DFLP model. The model is computationally intractable; therefore, we propose a hybrid algorithm based on nested partitions (NP) and simulated annealing (SA) algorithms, namely NP-SA. Moreover, we develop a heuristic algorithm to compute the values of the additional variables used in the RC model. The numerical results indicate that the NP-SA algorithm is very effective in giving a good solution in a short time. Furthermore, a simulation study demonstrates that, on average, robust solutions are better than nominal solutions.
动态设施布局问题(DFLP)是指工厂内的设施/部门在不同时期的布置,使设施的位置在不同时期之间发生变化。传统上,该问题的表述是通过假设所有参数都是确定的,以最小化规划范围内的物料搬运和重排成本总和。在本文中,我们假设部门之间的物资流动和重排成本是不确定的,并据此开发了DFLP模型的鲁棒对应(RC)。该模型在计算上难以处理;因此,我们提出了一种基于嵌套分区(NP)和模拟退火(SA)算法的混合算法,即NP-SA。此外,我们开发了一种启发式算法来计算RC模型中使用的附加变量的值。数值结果表明,NP-SA算法能够在较短的时间内给出较好的解。此外,仿真研究表明,平均而言,鲁棒解优于标称解。
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引用次数: 2
Surplus dissipating equilibria in the dollar auction 美元拍卖中的盈余耗散均衡
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-07-02 DOI: 10.1080/03155986.2019.1629771
Fredrik Ødegaard, C. Zheng
Abstract We analyze symmetric subgame perfect equilibria of the dollar auction in its original format, without the modifications that the literature adopts to rule out overbidding in the game. The game has a continuum of subgame perfect equilibria, generating expected revenues that range from zero to the full value of the contested prize. Such multiplicity of equilibria suggests that the overbidding pattern often observed in experiments of this game might be symptoms of coordination failure among bidders, consistent with the rational choice paradigm with no need for behavioral or psychological explanations. The analysis is shown robust to extensions considering: (i) alternative tie-breaking rule that allows for multiple frontrunners, and (ii) preemptive bidding by the frontrunner.
摘要:本文分析了美元拍卖的对称子博弈完全均衡的原始形式,而不做文献中为排除超额竞价所做的修改。该博弈具有连续的子博弈完美均衡,产生的预期收益范围从零到争夺奖品的全部价值。这种多重均衡表明,在博弈实验中经常观察到的过高出价模式可能是竞标者之间协调失败的症状,与理性选择范式一致,不需要行为或心理解释。考虑到:(i)允许多个领跑者的替代打破规则,以及(ii)领跑者的抢先竞标,该分析对扩展具有鲁棒性。
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引用次数: 1
Optimum workforce scheduling for multiple security gates 多个安全闸门的最佳人力调度
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-07-02 DOI: 10.1080/03155986.2019.1629770
Hesham K. Alfares, A. Alzahrani
Abstract This article presents a two-stage workforce scheduling approach for security guards at motor traffic gates. In the first stage, staffing requirements are determined based on analyzing workload variations for each gate. In the second stage, an integer programming model is formulated to assign guards to different work shifts in order to satisfy the staffing requirements of each gate. The objective is to minimize the total labour cost of two categories of security employees: non-supervising (guards), and supervising (supervisors). The new model considers multiple employee types, multiple shifts, and multiple locations, where security employees are assigned to work groups. Moreover, to maximize flexibility, each employee can be assigned to work at different gates during different shifts. Compared to the currently used schedule, the model produced an optimum work schedule that reduced the workforce size by 23% and the labour cost by 26%. Computational experiments with 40 randomly generated test problems confirmed the high savings potential of the proposed scheduling approach.
摘要本文提出了一种两阶段机动交通大门保安人员调度方法。在第一阶段,根据分析每个登机口的工作量变化确定人员配置需求。第二阶段,建立了一个整数规划模型,将警卫分配到不同的班次,以满足每个门的人员配备需求。目标是尽量减少两类安全雇员的总劳动力成本:非监督(警卫)和监督(主管)。新模型考虑了多种员工类型、多个班次和多个地点,其中安全员工被分配到工作组。此外,为了最大限度地提高灵活性,每个员工可以在不同的班次被分配到不同的登机口工作。与目前使用的时间表相比,该模型产生的最佳工作时间表减少了23%的劳动力规模和26%的劳动力成本。40个随机生成的测试问题的计算实验证实了所提出的调度方法的高节省潜力。
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引用次数: 3
Online cash-back shopping with network externalities 网络外部性下的在线返现购物
IF 1.3 4区 计算机科学 Q4 COMPUTER SCIENCE, INFORMATION SYSTEMS Pub Date : 2020-06-09 DOI: 10.1080/03155986.2020.1774300
Chen Chen, Yongrui Duan
Abstract Along with the popularity of online shopping, the cash-back industry is witnessing dramatic development. Under this backdrop, retailers who sell products with network externalities make different decisions about affiliating with cash-back sites. In this paper, we set up a cash-back model considering network externalities. Our goal is to identify the condition under which it is profitable for retailers whose products exhibit network externalities to affiliate with a cash-back site and to find out the driving force of the profitability. We find that only when there are more low-type consumers than high-type consumers and the degree of network externalities is lower than a certain threshold is it profitable for such a retailer to affiliate with an independent cash-back site, because the cash-back rate is decreasing in the intensity of network externality. It is the price discriminative effect instead of the promotive effect that makes it profitable. We show that the double-marginalization problem between the retailer and an independent cash-back site leads to the cash-back paradox where all consumers pay more for the product in the presence of a cash-back channel. We also show that when the retailer affiliates with two cash-back sites, each site has the incentive to lower the cash-back rate to take advantage of network externalities, which makes the cash-back paradox more likely to happen and makes it less likely for a retailer to benefit from cash-back channels. Furthermore, we suggest the retailer establish his own cash-back channel. Our work provides implications for retailers as well as for cash-back sites and consumers.
随着网上购物的普及,现金返还行业得到了迅猛的发展。在这种背景下,销售具有网络外部性产品的零售商在与现金返还网站合作的问题上做出了不同的决定。在本文中,我们建立了一个考虑网络外部性的现金返还模型。我们的目标是确定在何种条件下,产品表现出网络外部性的零售商与现金返还网站相关联是有利可图的,并找出盈利能力的驱动力。我们发现,只有当低类型消费者比高类型消费者多,并且网络外部性程度低于一定阈值时,零售商才会与独立的现金返还网站合作是有利可图的,因为现金返还率随着网络外部性的强度而降低。是价格歧视效应而不是促销效应使其有利可图。我们证明了零售商和独立现金返还网站之间的双重边缘化问题导致现金返还悖论,即在存在现金返还渠道的情况下,所有消费者都为产品支付更多费用。我们还表明,当零售商与两个现金返还网站相关联时,每个网站都有动机降低现金返还率以利用网络外部性,这使得现金返还悖论更有可能发生,并使零售商更不可能从现金返还渠道中受益。此外,我们建议零售商建立自己的现金返还渠道。我们的研究为零售商、现金返还网站和消费者提供了启示。
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引用次数: 4
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