In this talk we discuss a tactical model recently available in warehouse literature. The model integrates the replenishment decision in inventory management, the allocation of products to warehousing systems and the assignment of products to storage locations in warehousing management.
Our aim is to show the models’ potentialities and weaknesses when applied to a wide variety of problems and to identify challenging research opportunities for developing global warehouse decision support models that fill the gap between researchers and warehouse practitioners

Carvalho, Sameiro

Geraldes, Carla A.S.

Pereira, Guilherme

English

Biblioteca Digital do IPB

MD-14 EURO 24 - Lisbon 20101 - Discrete location for bundled demand pointsAlfredo Marín, Departamento de Estadística e InvestigaciónOperativa, University of Murcia, Facultad de Matemáticas,Campus de Espinardo, 30100, Murcia, Spain, amarin@um.esWe consider a discrete location problem where the demand points are groupedand propose a formulation, an enforcement for it and an associated agrangianrelaxation, and then we build feasible solutions to the problem from the optimalsolutions to the relaxed subproblems. Valid inequalities for the formulation arealso identified and added to the set of relaxed constraints. This method pro-duces good feasible solutions and enables us to address large instances of theproblem. Computational experiments have been performed with benchmarkinstances from the literature on related problems.2 - Lower Bounds for a Capacitated Facility Location Prob-lem with Penalties and RevenuesMaria João Lopes, Departamento de Métodos Quantitativos,Lisbon University Institute(ISCTE - IUL); CIO, Av. das ForcasArmadas, 1649-026, Liboa, Portugal, mjfl@iscte.ptWe consider a variant of the Capacitated Facility Location Problem in whichthe demand of each costumer may not be entirely supplied. In this variant, theavailable supply is not enough to satisfy the total demand. A penalty is associ-ated with each unit left out. On the other hand, each costumer can be suppliedby more than one facility. Nevertheless, satisfying the demand of a costumerentirely by exactly one facility is aimed. If this condition is satisfied revenue isconsidered. We propose a formulation for this problem and valid inequalitiesto improve the lower bounds.3 - Assessing the accuracy for estimation of Origin-Destination matrices in the railways system contextEva Barrena, Applied Mathematics I, University of Sevilla, Avda.Reina Mercedes s/n, 41012, Sevilla, Spain, ebarrena@us.es, MaTeresa Cáceres, Francisco A. Ortega, Miguel Angel PozoThe estimation of a travel matrix Origin-Destination (O-D), updated with traf-fic counts from the transport network and from a previous O-D matrix, is aproblem that is of interest for researchers, due to the challenge linked to thecomplexity involved, as well as for transport companies interested in knowingthe behavior of their users via a more economical and efficient procedure thanthe ones based on surveys. The most representative estimation methods arebased on entropy maximization, statistical inference models and optimizationmethods, whose effective resolution applies iterative algorithms, heuristics andmetaheuristics.The objectives of this paper consist in the evaluation of the prospects of thisproblem for a specific company such as RENFE-Cercanías Madrid, as well asthe evaluation of possible methodologies to apply depending on their adequacyto the real context. This work has been partially supported by the the An-dalusian Government project Ref. P09-TEP-5022 and by the Spanish researchProject PT-2007-003-08CCPP (CEDEX).4 - On a common structure of the discrete optimizationwith orderingAntonio Manuel Rodriguez-Chia, Estadistica e IO, Universidadde Cádiz, Facultad de Ciencias, Pol. Rio San Pedro, 11510,Puerto Real (Cadiz), Cadiz, Spain,antonio.rodriguezchia@uca.es, Elena Fernandez, Justo PuertoThis paper studies discrete optimization problems with ordering requirements.These problems are formulated on general discrete sets in which there exists animplicit ordering on their elements together with a cost function that evaluateseach element of a given subset depending on its ordering relative to the remain-ing elements in the set. It is proven that ordered sequences over the originalset define an independence system. The simplest and its restriction to sets ofa fixed cardinality are studied. Ordering problems on the intersection of twoindependence systems are addressed. MD-14Monday, 14:00-15:202.2.15Pricing IssuesStream: Supply Chain Planning [c]Contributed sessionChair: Carla A. S. Geraldes, Department of Industrial Management,Polytechnic Institute of Bragança, Campus de Santa Apolónia,Apartado 134, 5301-857, Bragança, Portugal, carlag@ipb.pt1 - A New Multi-Objective Approach for Pricing and Distri-bution in a Supply ChainD. Shishebori, Industrial Engineering, Iran University of Scienceand Technology, Narmak, 1684613114, Tehran, Tehran, Iran,Islamic Republic Of, shishebori@in.iut.ac.ir, S.g.r. Jalali-Naini,M. Karimi-NasabIn this research a new multi-objective approach is proposed to determine dis-tribution policy for a wholesaler of supplementary nutrition to a set of localdistribution centers positioned around the wholesaler, geographically. Each olocal distribution center has its own stochastic demand over planning periods.Also the demand of each local distribution center in a planning period is consid-ered as a normal distribution function. There is a time series relation betweenthe mean of demand of each local distribution center in a period and previousperiods. The model illustrates the conflict of two objectives for the main part-ners of the problem: manager of the wholesaler aims at maximizing the totalprofit of the wholesaler, and local distribution centers desire to maximize theminimum service level received from the wholesaler. The approach optimizesselling price, carrying cost, batch size and services level of multi items for eachlocal distribution center in every planning period. Some of the theorems areproven about different characteristics of the proposed model and a new solu-tion method is proposed for obtaining a set of global Pareto-optimal solutionsof the problem. The solution method is proven to be able to find all globalPareto-optimal solutions of the problem in certain conditions. Finally the com-putational experiences of running the proposed approach in a real case studyare analyzed.2 - Determination of pre-order and after-order prices for acapacitated supply systemBisheng Du, Department of Business Studies, Aarhus School ofBusiness, Aarhus University, Fuglesangs Alle 4, DK-8210Aarhus V, 8210, Aarhus V, Aarhus, Denmark, bisd@asb.dk,Christian LarsenIn order to transfer some of the risk of having developed inadequate capacityto his buyers a supplier may be willing to offer his buyers to make pre-orders,issued before the capacity decision, in exchange for reduced prices comparedto the prices the buyers pay after having observed their demand. By use of anews-vendor model we develop the optimization problem for the single buyercase and investigate the optimal prices. In addition, we also investigate the caseof demand probability updating given the advance demand information.3 - Competitive Price-Matching Guarantees under DemandUncertainty and Customer Heterogeneity: Effects ofProduct Availability and Its VerificationArcan Nalca, School of Business, Queen’s University, Canada,arcan.nalca@business.queensu.ca, Tamer Boyaci, Saibal RayPrice-matching-guarantees (PMGs) are offers where firms promise to matchany lower price offered by competitors. Firms nowadays reserve the rightto verify the availability of the product at competitors’ and decline to matchthe price unless it is available. Focusing on these elements, we investigatethe effects of demand uncertainty and verification of availability in the contextof PMGs and show that verifying availability is a significant profit-enhancingmechanism for innovative products.4 - Integrated approaches to warehouse planning and op-erationsCarla A. S. Geraldes, Department of Industrial Management,Polytechnic Institute of Bragança, Campus de Santa Apolónia,Apartado 134, 5301-857, Bragança, Portugal, carlag@ipb.pt,Sameiro Carvalho, Guilherme PereiraIn this talk we discuss a tactical model recently available in warehouse liter-ature. The model integrates the replenishment decision in inventory manage-ment, the allocation of products to warehousing systems and the assignmentof products to storage locations in warehousing management. Our aim is toshow the models’ potentialities and weaknesses when applied to a wide varietyof problems and to identify challenging research opportunities for developingglobal warehouse decision support models that fill the gap between researchersand warehouse practitioners.72

Integrated approaches to warehouse planning and operations

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Integrated approaches to warehouse planning and operations

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