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  • Consumer returns in consignment contracts with inventory control and additive uncertainty
    Infor (IF 0.972) Pub Date : 2020-08-04
    Milena Bieniek

    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

    更新日期:2020-08-04
  • Elective course assignment problem: a revenue management based approach
    Infor (IF 0.972) Pub Date : 2020-07-23
    Armagan Ozbilge; Aydin Ulucan; Kazim Baris Atici

    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

    更新日期:2020-07-23
  • The changing landscape of supply chain networks: an empirical analysis of topological structure
    Infor (IF 0.972) Pub Date : 2020-07-20
    Penina Orenstein

    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

    更新日期:2020-07-20
  • Joint pricing and lot sizing model with statistical inspection and stochastic lead time
    Infor (IF 0.972) Pub Date : 2020-07-20
    Maryam Safarnezhad; M. Aminnayeri; R. Ghasemy Yaghin

    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

    更新日期:2020-07-20
  • Asymmetric distance location model
    Infor (IF 0.972) Pub Date : 2020-07-16
    Tammy Drezner; Zvi Drezner

    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.

    更新日期:2020-07-16
  • Estimation of fuzzy portfolio efficiency via an improved DEA approach
    Infor (IF 0.972) Pub Date : 2020-05-14
    Helu Xiao; Tiantian Ren; Teng Ren

    DEA (Data Envelopment Analysis) is a nonparametric approach that has been used to estimate fuzzy portfolio efficiency. In this paper, we propose an approach under the fuzzy theory framework that can both improve the DEA frontier and suggest a replicable benchmark for investors. We first construct an improved DEA model using the proposed approach and then investigate the relationships among the evaluation

    更新日期:2020-07-06
  • A hybrid nested partitions and simulated annealing algorithm for dynamic facility layout problem: a robust optimization approach
    Infor (IF 0.972) Pub Date : 2020-07-06
    Leila Khajemahalle; Saeed Emami; Ramezan Nemati Keshteli

    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

    更新日期:2020-07-06
  • Online cash-back shopping with network externalities
    Infor (IF 0.972) Pub Date : 2020-06-09
    Chen Chen; Yongrui Duan

    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

    更新日期:2020-06-09
  • The impact of platform fee scheme on manufacturer-E-tailer co-operative advertising: A game-theoretic analytical study
    Infor (IF 0.972) Pub Date : 2020-06-02
    Junbin Wang; Xiaojun Fan; Nianqi Deng

    This study analyzes how the new online platform-selling format affects the optimal co-operative advertising choices of both the manufacturer and the e-commerce platform (e-tailer), and explores the effects of the e-tailer’s contractual forms and commission fees on these choices. In the model, the manufacturer can decide its advertising expenditure as well as the level of participation in the e-tailer’s

    更新日期:2020-06-02
  • Manufacturer rebate in green supply chain with information asymmetry
    Infor (IF 0.972) Pub Date : 2020-05-19
    Zhibing Lin

    In this article, we study the influences of manufacturer rebate on the outcomes of the channel members in a green supply chain, where the retailer has private information about market demand. We find that, (1) manufacturer rebate is good for the channel members, however, the manufacturer takes a lower share of the incremental profit than the retailer; (2) the value of manufacturer rebate for the channel

    更新日期:2020-05-19
  • Generalization bounds for regularized portfolio selection with market side information
    Infor (IF 0.972) Pub Date : 2020-05-13
    Thierry Bazier-Matte; Erick Delage

    Drawing on statistical learning theory, we derive out-of-sample and optimality guarantees about the investment strategy obtained from a regularized portfolio optimization model which attempts to exploit side information about the financial market in order to reach an optimal risk-return tradeoff. This side information might include for instance recent stock returns, volatility indexes, financial news

    更新日期:2020-05-13
  • Strategy analysis of the producer considering product design and collection effort under take-back legislation
    Infor (IF 0.972) Pub Date : 2020-05-07
    Bangyi Li; Yuyu Chen; Guoqing Zhang; Qingguo Bai

    To reduce the environmental pollution of Waste Electrical and Electronic Equipment (WEEE), the government has promulgated take-back legislation. For the producer, he should consider collection effort and remanufacturing design response to collection goal and remanufacturing goal. In this article, we develop two models: (1) model only with remanufacturing design and (2) model with both collection effort

    更新日期:2020-05-07
  • Preface to the special issue of INFOR on “continuous optimization and applications in machine learning and data analytics”
    Infor (IF 0.972) Pub Date : 2020-04-24
    Miguel Anjos; Fabian Bastin; Sébastien Le Digabel; Andrea Lodi

    (2020). Preface to the special issue of INFOR on “continuous optimization and applications in machine learning and data analytics”. INFOR: Information Systems and Operational Research: Vol. 58, Special Issue on 'Continuous Optimization and Applications in Machine Learning and Data Analytics', pp. 167-167.

    更新日期:2020-04-24
  • Product diversification decisions considering quality reliability and self-competition in a global supply chain
    Infor (IF 0.972) Pub Date : 2020-04-16
    Baozhuang Niu; Dilang Wu; Zihao Mu

    Sourcing overseas enables customers to experience high-quality products, especially for those in the developing countries/regions. This induces many brand-owners to decide product diversification by selling both imported products (high quality reliability) and local products (low quality reliability), although product self-competition occurs and may result in system profit loss. In this paper, we consider

    更新日期:2020-04-16
  • Closed loop supply chain network design under uncertain price-sensitive demand and return
    Infor (IF 0.972) Pub Date : 2020-04-16
    Amir Farshbaf-Geranmayeh; Alireza Taheri-Moghadam; S. Ali Torabi

    In this paper, a closed-loop supply chain network design problem is developed. In the proposed model, expected returned products is estimated as a function of return price and if the amount of returned products is less than the expected amount, decision makers have some choices such as more advertising, incentives (extra cost) for returning more products. Different quality levels are considered for

    更新日期:2020-04-16
  • Performance balancing size-interval routing policies
    Infor (IF 0.972) Pub Date : 2020-03-31
    Josu Doncel

    We study a parallel-queue system with Poisson arrivals, in which a dispatcher sends the incoming traffic to K queues using Size Interval Task Assignment (SITA) policy that aims to equalize the performance of all queues. We study existence and uniqueness of the allocation thresholds for a large set of performance functions of the queues. We also provide a family of performance functions of the queues

    更新日期:2020-03-31
  • An efficient heuristic method for joint optimization of train scheduling and stop planning on double-track railway systems
    Infor (IF 0.972) Pub Date : 2020-03-30
    Morteza Boroun; Somayeh Ramezani; Nazanin Vasheghani Farahani; Erfan Hassannayebi; Saina Abolmaali; Masoud Shakibayifar

    In this study, a new mathematical programming approach for solving the joint timetabling and train stop planning problem in a railway line with double-track segments is proposed. This research aims to design an optimized train timetable subject to the station-capacity and time-dependent dwell time constraints. The objective function is to maximize the railway infrastructure capacity by minimizing the

    更新日期:2020-03-30
  • Upgrade strategies in the two-sided market: Updated strategy vs. derived strategy
    Infor (IF 0.972) Pub Date : 2020-03-24
    Jiping Gao; Gongbing Bi; Wuyi Ye

    Product innovation and service upgrades are effective measures for firms to improve their competitiveness. Considering the upgrading of the installed customers (IU), the upgrade strategy of a platform firm usually follows two principles, namely, the derived principle (i.e., the basic product still operates when the new derived product is released) or updated principle (i.e., the basic product stops

    更新日期:2020-03-24
  • Global optimization for mixed categorical-continuous variables based on Gaussian process models with a randomized categorical space exploration step
    Infor (IF 0.972) Pub Date : 2020-03-19
    Miguel Munoz Zuniga; Delphine Sinoquet

    Real industrial studies often give rise to complex optimization problems involving mixed variables and time consuming simulators. To deal with these difficulties we propose the use of a Gaussian process regression surrogate with a suitable kernel able to capture simultaneously the output correlations with respect to continuous and categorical/discrete inputs without relaxation of the categorical variables

    更新日期:2020-03-19
  • A survey of nonlinear robust optimization
    Infor (IF 0.972) Pub Date : 2020-03-17
    Sven Leyffer; Matt Menickelly; Todd Munson; Charlie Vanaret; Stefan M. Wild

    Abstract Robust optimization (RO) has attracted much attention from the optimization community over the past decade. RO is dedicated to solving optimization problems subject to uncertainty: design constraints must be satisfied for all the values of the uncertain parameters within a given uncertainty set. Uncertainty sets may be modeled as deterministic sets (boxes, polyhedra, ellipsoids), in which

    更新日期:2020-03-17
  • A workforce planning and allocation model for the outbound baggage loading area at Santiago International Airport
    Infor (IF 0.972) Pub Date : 2020-03-16
    Juan Pablo Cavada; Cristián E. Cortés; Pablo A. Rey

    A methodology is presented that determines the staff requirements for a baggage handling operation at an international airport facing high demand. It consists of two sequentially solved integer linear programming models. The first model determines the handler requirement using historical demand data and incorporates the operation’s spatial constraints. The second model, taking as input the results

    更新日期:2020-03-16
  • Balancing herding and congestion in service systems: a queueing perspective
    Infor (IF 0.972) Pub Date : 2020-03-16
    Hao Zhang; Qi-Ming He; Xiaobo Zhao

    In service industries such as restaurants and tourism, empirical findings show that uninformed customers may consider queues as a signal of service quality and choose to join a longer queue. Service managers become aware of this phenomenon and stimulate customer purchase by maintaining a queue. In this paper, we explore issues related to the balance between herding and congestion for service systems

    更新日期:2020-03-16
  • A simulated annealing for a daily operating room scheduling problem under constraints of uncertainty and setup
    Infor (IF 0.972) Pub Date : 2020-03-16
    Mohamed Amine Abdeljaouad; Zied Bahroun; Nour El Houda Saadani; Belhassen Zouari

    This article addresses the daily scheduling of surgeries in an operating theatre. The problem consists of a set of surgical operations that have to be scheduled in identical operating rooms. The operations have uncertain durations, require setup activities before and after the surgical act and are assigned to surgeons who have to perform the surgical part. The objective is to find the best sequence

    更新日期:2020-03-16
  • K-best feasible clusters - ranking optimal solutions from an infeasible LP
    Infor (IF 0.972) Pub Date : 2020-03-04
    Paula Alexandra Amaral; Pedro Barahona

    Analysing conflicts in large optimization problems is an intricate and difficult task. In this paper we present a tool for infeasible LP, to guide the decision maker towards an adequate strategy for dealing with the infeasibility. We propose a mathematical formulation for the ranking of the optimal values and solutions among all feasible subsets of constraints, that is, to find (feasible) clusters

    更新日期:2020-03-04
  • Incentives for Optimal Multi-level Allocation of HIV Prevention Resources.
    Infor (IF 0.972) Pub Date : 2011-11-01
    Monali M Malvankar,Gregory S Zaric

    HIV/AIDS prevention funds are often allocated at multiple levels of decision-making. Optimal allocation of HIV prevention funds maximizes the number of HIV infections averted. However, decision makers often allocate using simple heuristics such as proportional allocation. We evaluate the impact of using incentives to encourage optimal allocation in a two-level decision-making process. We model an incentive

    更新日期:2019-11-01
  • Correction
    Infor (IF 0.972) Pub Date : 2019-07-30

    (2020). Correction. INFOR: Information Systems and Operational Research: Vol. 58, Special Issue on 'Continuous Optimization and Applications in Machine Learning and Data Analytics', pp. 424-424.

    更新日期:2019-07-30
  • Preserving cost and revenue efficiency through inverse data envelopment analysis models
    Infor (IF 0.972) Pub Date : 2019-07-30
    Khosro Soleimani-Chamkhorami; Farhad Hosseinzadeh Lotfi; Gholam Reza Jahanshahloo; Mohsen Rostamy-Malkhalifeh

    Data envelopment analysis (DEA) models are applied in commercial firms to evaluate their technical, cost and revenue efficiencies. The new models introduced here are based on inverse DEA for preserving cost/revenue efficiency. The commercial institution management seeks to minimize the input costs for a given level of outputs or maximize the revenue of outputs for a specified level of inputs. It is

    更新日期:2019-07-30
  • A Unified Efficient Implementation of Trust-region Type Algorithms for Unconstrained Optimization
    Infor (IF 0.972) Pub Date : 2019-07-29
    Jean-Pierre Dussault

    Adaptive cubic regularization (ARC) and trust-region (TR) methods use modified linear systems to compute their steps. The modified systems consist in adding some multiple of the identity matrix (or a well-chosen positive definite matrix) to the Hessian to obtain a sufficiently positive definite linear system, the so called shifted system. This type of system was first proposed by Levenberg and Marquardt

    更新日期:2019-07-29
  • The lower-class waiting time distribution in the delayed accumulating priority queue
    Infor (IF 0.972) Pub Date : 2019-07-24
    Maryam Mojalal; David A. Stanford; Richard J. Caron

    Abstract The Accumulating Priority Queue model, in which customers accumulate priority as a linear function of their time in the queue, was first introduced by Kleinrock in 1964 under another name. All publications addressing the APQ since then have assumed that customers start accumulating priority credits upon arrival. The model we present herein, called the Delayed Accumulating Priority Queue, entails

    更新日期:2019-07-24
  • Correction
    Infor (IF 0.972) Pub Date : 2019-07-18

    (2019). Correction. INFOR: Information Systems and Operational Research. Ahead of Print.

    更新日期:2019-07-18
  • Multiobjective artificial fish swarm algorithm for multiple sequence alignment
    Infor (IF 0.972) Pub Date : 2019-07-02
    Ali Dabba; Abdelkamel Tari; Djaafar Zouache

    Multiple sequence alignment (MSA) represents a basic task for many bioinformatics applications. MSA allows finding common conserved regions among various sequences of proteins or DNA. However, to find the optimal multiple sequence alignment, it is necessary to design an efficient exploration approach that could explore a huge number of possible multiple sequence alignments. As well as, it is required

    更新日期:2019-07-02
  • Surplus dissipating equilibria in the dollar auction
    Infor (IF 0.972) Pub Date : 2019-06-28
    Fredrik Ødegaard; Charles Z. Zheng

    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

    更新日期:2019-06-28
  • Optimum workforce scheduling for multiple security gates
    Infor (IF 0.972) Pub Date : 2019-06-24
    Hesham K. Alfares; Abdulaziz S. Alzahrani

    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

    更新日期:2019-06-24
  • Least squares policy iteration with instrumental variables vs. direct policy search: comparison against optimal benchmarks using energy storage
    Infor (IF 0.972) Pub Date : 2019-06-19
    Somayeh Moazeni; Warren R. Scott; Warren B. Powell

    This article studies least-squares approximate policy iteration (API) methods with parametrized value-function approximation. We study several variations of the policy evaluation phase, namely, Bellman error minimization, Bellman error minimization with instrumental variables, projected Bellman error minimization, and projected Bellman error minimization with instrumental variables. For a general discrete-time

    更新日期:2019-06-19
  • Using discrete event simulation to fit probability distributions for autocorrelated service times
    Infor (IF 0.972) Pub Date : 2019-06-18
    Mojtaba Araghi; Barış Balcıog˜lu

    In the literature, it has been shown that autocorrelation in service times has a dramatic impact on performance measures in delay systems. Although some studies deal with systems having autocorrelated service times, a general renewal approximation methodology that can incorporate this information in analytical models has not been previously proposed. In this paper, we develop a discrete event simulation

    更新日期:2019-06-18
  • Simulated co-location of patients admitted to an inpatient internal medicine teaching unit: potential impacts on efficiency and physician-nurse collaboration
    Infor (IF 0.972) Pub Date : 2019-06-18
    Blair L. Bilodeau; David A. Stanford; Mark Goldszmidt; Andrew Appleton

    Effective communication between nurses and physician teams on the internal medicine unit is crucial for high quality, safe, and efficient patient care. In our hospital of interest, a large academic health sciences centre, the physical layout of the unit, current admission process, and the presence of three separate physician teams contribute to uneven workload and communication barriers. We address

    更新日期:2019-06-18
  • DEA model considering outputs with stochastic noise and a heavy-tailed (stable) distribution
    Infor (IF 0.972) Pub Date : 2019-06-14
    Hassan Naseri; S. Esmaeil Najafi; Abbas Saghaei

    Data envelopment analysis (DEA) is a nonparametric data-based approach that is used to evaluate the performance of a set of homogeneous units; hence, inputs and outputs play a crucial role in this evaluation. In many technologies, the inputs and outputs are so volatile and complex that even other stochastic events can have an influence in the measurement accuracy. A suitable estimation method can be

    更新日期:2019-06-14
  • An algorithmic framework for the optimization of computationally expensive bi-fidelity black-box problems
    Infor (IF 0.972) Pub Date : 2019-06-07
    Juliane Müller

    We introduce an algorithm for the optimization of problems whose objective functions are evaluated by computationally expensive black-box simulations and for which an analytic description of the objective and its derivatives are not available. We consider the case where two levels of simulation model fidelity are available, namely a high fidelity model that is computationally very expensive to evaluate

    更新日期:2019-06-07
  • An improved tabu search algorithm for the petrol-station replenishment problem with adjustable demands
    Infor (IF 0.972) Pub Date : 2019-05-31
    Abdelaziz Benantar; Rachid Ouafi; Jaouad Boukachour

    This paper discusses the petrol-station replenishment problem with adjustable demands (PSRP-AD). This problem originates from a practical application of fuel delivery, where the main objective is to satisfy all petrol-station demands at a minimal cost. However, the problem includes tanks with adjustable loads while respecting the agreement made between the company and the customers. This agreement

    更新日期:2019-05-31
  • On the identification of the optimal partition for semidefinite optimization
    Infor (IF 0.972) Pub Date : 2019-03-05
    Ali Mohammad-Nezhad; Tamás Terlaky

    The concept of the optimal partition was originally introduced for linear optimization and linear complementarity problems and subsequently extended to semidefinite optimization. For linear optimization and sufficient linear complementarity problems, from a central solution sufficiently close to the optimal set, the optimal partition and a maximally complementary optimal solution can be identified

    更新日期:2019-03-05
  • Generalized maximum-entropy sampling
    Infor (IF 0.972) Pub Date : 2019-02-21
    Jon Lee; Joy Lind

    We introduce the generalized constrained maximum-entropy sampling problem (GCMESP) as a common generalization of the ordinary constrained maximum-entropy sampling problem (CMESP) and the constrained D-optimality problem (CDOPTP). Exact algorithms for both CMESP and CDOPTP are based on branch-and-bound methods. We extend a spectral upper-bounding method for the CMESP to the GCMESP.

    更新日期:2019-02-21
  • A regularized interior-point method for constrained linear least squares
    Infor (IF 0.972) Pub Date : 2019-02-19
    Mohsen Dehghani; Andrew Lambe; Dominique Orban

    We propose an infeasible interior-point algorithm for constrained linear least-squares problems based on the primal-dual regularization of convex programs of Friedlander and Orban. Regularization allows us to dispense with the assumption that the active gradients are linearly independent. At each iteration, a linear system with a symmetric quasi-definite (SQD) matrix is solved. This matrix is shown

    更新日期:2019-02-19
  • Algorithmic determination of immobile indices in convex SIP problems with polyhedral index sets
    Infor (IF 0.972) Pub Date : 2019-01-17
    O. I. Kostyukova; T. V. Tchemisova

    The concepts of immobile indices and their immobility orders are objective and important characteristics of feasible sets of semi-infinite programming (SIP) problems. They can be used for the formulation of new efficient optimality conditions without constraint qualifications. Given a class of convex SIP problems with polyhedral index sets, we describe and justify a finite constructive algorithm (algorithm

    更新日期:2019-01-17
  • Design of a quality control network for an international food company
    Infor (IF 0.972) Pub Date : 2019-01-07
    Simone Voldrich; Philippe Wieser; Nicolas Zufferey

    In this article, the design of a quality control network is considered in an entire supply chain, in the context of an international food and beverage company, denoted as ABC. For each possible control point of the network, two decisions have to be made: (1) establish a monitoring activity or not; (2) if a monitoring activity is placed, determine its acceptance level with a well-adjusted sampling plan

    更新日期:2019-01-07
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