RAIRO - Operations Research

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Special issue - Fuzzy Data Envelopment Analysis: Recent Developments and Applications

Dynamic fuzzy data envelopment analysis models: Case of bus transport performance assessment

Received: 30 September 2016 / Revised: 30 June 2017 / Accepted: 07 September 2017
DOI: https://doi.org/10.1051/ro/2017064

ROADEF 2017

Fleet management for autonomous vehicles: Online PDP under special constraints

Received: 30 April 2017 / Revised: 15 March 2018 / Accepted: 30 May 2018
DOI: https://doi.org/10.1051/ro/2018042

Multi-item Optimal control problem with fuzzy costs and constraints using Fuzzy variational principle

Received: 11 October 2017 / Revised: 19 January 2019 / Accepted: 24 February 2019
DOI: https://doi.org/10.1051/ro/2019022

A self-adaptive biogeography based optimization algorithm for solving the set covering problem

Received: 29 April 2017 / Revised: 04 March 2019 / Accepted: 29 March 2019
DOI: https://doi.org/10.1051/ro/2019039

Special issue - Operations Research Applications in Industry

An Extended Approach for Manufacturing Strategy Process base on Organization Performance through Fuzzy QFD

Received: 17 March 2017 / Revised: 17 May 2018 / Accepted: 04 September 2018
DOI: https://doi.org/10.1051/ro/2018065

On the Problem of Minimizing the Cost with Optical Devices in Wavelength Division Multiplexing Optical Networks: complexity analysis, mathematical formulation and improved heuristics

Received: 28 June 2017 / Revised: 09 April 2018 / Accepted: 04 September 2018
DOI: https://doi.org/10.1051/ro/2018072

A new robust possibilistic programming model for reliable supply chain network design: A case study of lead-acid battery supply chain

Received: 26 March 2017 / Revised: 20 April 2018 / Accepted: 04 September 2018
DOI: https://doi.org/10.1051/ro/2018073

Cellular layout design using Tabu search, a case study

Received: 15 August 2017 / Revised: 05 March 2018 / Accepted: 08 September 2018
DOI: https://doi.org/10.1051/ro/2018077

    Fuzzy Data Envelopment Analysis: Recent Developments and Applications

    Fuzzy stochastic data envelopment analysis with application to NATO enlargement problem

    Received: 22 January 2017 / Revised: 04 April 2018 / Accepted: 04 September 2018
    DOI: https://doi.org/10.1051/ro/2018075

    A Fuzzy Multi-Objective Programming Approach to Develop a Green Closed-Loop Supply Chain Network Design Problem under Uncertainty: Modifications of Imperialist Competitive Algorithm

    Received: 28 October 2018 / Revised: 19 January 2019 / Accepted: 29 January 2019
    DOI: https://doi.org/10.1051/ro/2019018

      Optimal power consumption control of sensor node based on (N,D)-policy discrete-time queues

      Received: 19 October 2016 / Revised: 19 April 2017 / Accepted: 10 June 2017
      DOI: https://doi.org/10.1051/ro/2017048

      An inventory model of a three parameter Weibull distributed deteriorating item with variable demand dependent on price and frequency of advertisement under trade credit

      Received: 19 August 2016 / Revised: 23 May 2017 / Accepted: 10 June 2017
      DOI: https://doi.org/10.1051/ro/2017052

      Nonmonotone conic trust region method with line search technique for bound constrained optimization

      Received: 20 December 2016 / Revised: 12 June 2017 / Accepted: 24 June 2017
      DOI: https://doi.org/10.1051/ro/2017054

      Portfolio selection with robust estimators considering behavioral biases in a causal network

      Received: 25 July 2016 / Revised: 22 June 2017 / Accepted: 03 July 2017
      DOI: https://doi.org/10.1051/ro/2017056

      An adaptive nonmonotone trust region method based on a modified scalar approximation of the Hessian in the successive quadratic subproblems

      Received: 14 January 2017 / Revised: 24 May 2017 / Accepted: 23 July 2017
      DOI: https://doi.org/10.1051/ro/2017057

      A Newton method for capturing Pareto optimal solutions of fuzzy multiobjective optimization problems

      Received: 31 December 2016 / Revised: 28 June 2017 / Accepted: 23 July 2017
      DOI: https://doi.org/10.1051/ro/2017058

      Numerical solution for the performance characteristics of the M/M/C/K retrial queue with negative customers and exponential abandonments by using value extrapolation method

      Received: 22 October 2016 / Revised: 30 May 2017 / Accepted: 23 July 2017
      DOI: https://doi.org/10.1051/ro/2017059

      Optimal product quality and pricing strategy for a two-period closed-loop supply chain with retailer variable markup

      Received: 24 February 2017 / Revised: 08 August 2017 / Accepted: 07 September 2017
      DOI: https://doi.org/10.1051/ro/2017061

      Allocating hubs to nodes for minimizing the hubs processing resources: a case study.

      Received: 28 August 2016 / Revised: 03 March 2017 / Accepted: 07 September 2017
      DOI: https://doi.org/10.1051/ro/2017065

      Evaluation of a new decision-aid parameter for job shop scheduling under uncertainties

      Received: 20 July 2016 / Revised: 08 March 2017 / Accepted: 05 October 2017
      DOI: https://doi.org/10.1051/ro/2017073

      Suppliers Selection Problem with Quantity Discounts and Price Changes: a Heuristic Approach

      Received: 18 April 2017 / Revised: 05 October 2017 / Accepted: 08 October 2017
      DOI: https://doi.org/10.1051/ro/2017075

      The support unit location problem to road traffic surveys with multi-stages

      Received: 22 March 2017 / Revised: 10 October 2017 / Accepted: 30 October 2017
      DOI: https://doi.org/10.1051/ro/2017084

      Single-machine lot scheduling problem for deteriorating items with negative exponential deterioration rate

      Received: 27 September 2017 / Revised: 04 May 2018 / Accepted: 08 May 2018
      DOI: https://doi.org/10.1051/ro/2018037

      Coordinated decision-making on manufacturer's EPQ-based and buyer's period review inventory policies with stochastic price-sensitive demand: A credit option approach

      Received: 30 November 2017 / Revised: 29 April 2018 / Accepted: 21 May 2018
      DOI: https://doi.org/10.1051/ro/2018038

      Optimal dynamic pricing, preservation technology investment and periodic ordering policies for agricultural products

      Received: 30 October 2017 / Revised: 08 May 2018 / Accepted: 30 May 2018
      DOI: https://doi.org/10.1051/ro/2018040

      Influence of controllable lead time, premium price, and unequal shipments under environmental effects in a supply chain management

      Received: 10 June 2017 / Revised: 04 March 2018 / Accepted: 30 May 2018
      DOI: https://doi.org/10.1051/ro/2018041

      Signed double Roman $k$-domination in trees

      Received: 29 September 2017 / Revised: 02 May 2018 / Accepted: 30 May 2018
      DOI: https://doi.org/10.1051/ro/2018043

      A vendor managed inventory on consignment with penalty as a supply chain coordination arrangement

      Received: 10 April 2017 / Revised: 25 March 2018 / Accepted: 19 June 2018
      DOI: https://doi.org/10.1051/ro/2018049

      Mean-variance portfolio selection with an uncertain exit-time in a regime-switching market

      Received: 23 March 2017 / Revised: 02 May 2018 / Accepted: 19 June 2018
      DOI: https://doi.org/10.1051/ro/2018050

      DEA models for two decision makers with conflicts: the principal-agent problem

      Received: 21 November 2016 / Revised: 23 May 2018 / Accepted: 19 June 2018
      DOI: https://doi.org/10.1051/ro/2018052

      Two-period pricing strategies in a two-echelon supply chain with conspicuous consumption

      Received: 24 January 2018 / Revised: 08 June 2018 / Accepted: 27 June 2018
      DOI: https://doi.org/10.1051/ro/2018053

      Some results on the b-chromatic number in complementary prism graphs

      Received: 21 January 2018 / Revised: 31 May 2018 / Accepted: 27 June 2018
      DOI: https://doi.org/10.1051/ro/2018054

      STALLING FOR SOLVING SLOW SERVER PROBLEM

      Received: 19 November 2017 / Revised: 11 June 2018 / Accepted: 07 July 2018
      DOI: https://doi.org/10.1051/ro/2018056

      Analysis of a discrete-time repairable queue with disasters and working breakdowns

      Received: 06 November 2017 / Revised: 14 June 2018 / Accepted: 07 July 2018
      DOI: https://doi.org/10.1051/ro/2018057

      On multi-level multi-objective linear fractional programming problem with interval parameters

      Received: 09 November 2017 / Revised: 06 July 2018 / Accepted: 03 August 2018
      DOI: https://doi.org/10.1051/ro/2018063

      Optimal online algorithms for the portfolio selection problem, bi-directional trading and -search with interrelated prices

      Received: 25 June 2018 / Accepted: 04 September 2018
      DOI: https://doi.org/10.1051/ro/2018064

      A three-echelon supply chain model with price and two-level quality dependent demand

      Received: 08 February 2018 / Revised: 14 July 2018 / Accepted: 04 September 2018
      DOI: https://doi.org/10.1051/ro/2018066

      Equilibrium and incentives for supervisor-postgraduate collaborations: A game-theoretic approach

      Received: 29 January 2018 / Revised: 22 June 2018 / Accepted: 04 September 2018
      DOI: https://doi.org/10.1051/ro/2018067

      A mathematical formulation of time-cost and reliability optimisation for supply chain management in Research-Development projects

      Received: 16 November 2017 / Revised: 30 March 2018 / Accepted: 04 September 2018
      DOI: https://doi.org/10.1051/ro/2018068

      A rule-based heuristic algorithm for on-line order batching and scheduling in an order picking warehouse with multiple pickers

      Received: 13 November 2017 / Revised: 24 July 2018 / Accepted: 04 September 2018
      DOI: https://doi.org/10.1051/ro/2018069

      Closed form of the response function in FDH technologies: Theory, computation and application

      Received: 02 October 2017 / Revised: 01 July 2018 / Accepted: 04 September 2018
      DOI: https://doi.org/10.1051/ro/2018070

      An optimization technique for national income determination model with stability analysis of differential equation in discrete and continuous process under the uncertain environment

      Received: 16 September 2017 / Revised: 23 June 2018 / Accepted: 04 September 2018
      DOI: https://doi.org/10.1051/ro/2018071

      On the star forest polytope for trees and cycles

      Received: 01 June 2015 / Revised: 24 June 2018 / Accepted: 04 September 2018
      DOI: https://doi.org/10.1051/ro/2018076

      Analysis of state-dependent discrete-time queue with system disaster

      Received: 26 March 2017 / Revised: 25 January 2018 / Accepted: 08 September 2018
      DOI: https://doi.org/10.1051/ro/2018078

      Second-order sensitivity analysis for parametric equilibrium problems in set-valued optimization

      Received: 02 May 2018 / Revised: 30 July 2018 / Accepted: 19 September 2018
      DOI: https://doi.org/10.1051/ro/2018080

      A Linear Programming Based Approach for Composite-Action Markov Decision Processes

      Received: 12 December 2017 / Revised: 06 July 2018 / Accepted: 19 September 2018
      DOI: https://doi.org/10.1051/ro/2018081

      A COMPUTATIONALLY EFFICIENT ALGORITHM TO APPROXIMATE THE PARETO FRONT OF MULTI-OBJECTIVE LINEAR FRACTIONAL PROGRAMMING PROBLEM

      Received: 13 July 2017 / Revised: 14 March 2018 / Accepted: 19 September 2018
      DOI: https://doi.org/10.1051/ro/2018083

      Necessary and sufficient optimality conditions using convexifactors for mathematical programs with equilibrium constraints

      Received: 30 June 2017 / Revised: 18 April 2018 / Accepted: 19 September 2018
      DOI: https://doi.org/10.1051/ro/2018084

      Facet-inducing inequalities with acyclic supports for the caterpillar-packing polytope

      Received: 21 December 2017 / Revised: 11 August 2018 / Accepted: 21 September 2018
      DOI: https://doi.org/10.1051/ro/2018085

      Two phases inventory model with variable cycle length under discount policy

      Received: 16 September 2017 / Revised: 14 August 2018 / Accepted: 27 September 2018
      DOI: https://doi.org/10.1051/ro/2018086

      Optimizing vendor-managed inventory systems with limited storage capacity and partial backordering under stochastic demand

      Received: 06 December 2017 / Revised: 25 August 2018 / Accepted: 12 October 2018
      DOI: https://doi.org/10.1051/ro/2018090

      Cross-brand and cross-channel advertising strategies in a dual-channel supply chain

      Received: 08 February 2018 / Revised: 11 August 2018 / Accepted: 12 October 2018
      DOI: https://doi.org/10.1051/ro/2018091

        On an optimal replenishment policy for inventory models for non-instantaneous deteriorating items with stock dependent demand and partial backlogging

        Received: 05 April 2018 / Revised: 09 September 2018 / Accepted: 12 October 2018
        DOI: https://doi.org/10.1051/ro/2018092

        Two-warehouse inventory model for deteriorating items with partial backlogging and advance payment scheme

        Received: 11 May 2018 / Revised: 16 August 2018 / Accepted: 12 October 2018
        DOI: https://doi.org/10.1051/ro/2018093

        Governmental subsidy policies and supply chain decisions with carbon emission limit and consumer's environmental awareness

        Received: 03 January 2017 / Revised: 10 August 2018 / Accepted: 20 October 2018
        DOI: https://doi.org/10.1051/ro/2018094

        A hybrid algorithm Tabu Search - GRASP for wounded evacuation in disaster response.

        Received: 17 June 2018 / Revised: 06 September 2018 / Accepted: 20 October 2018
        DOI: https://doi.org/10.1051/ro/2018095

        Optimal Multi-Product Supplier Selection under Stochastic Demand with Service Level and Budget Constraints using Learning Vector Quantization Neural Network

        Received: 15 March 2018 / Revised: 27 August 2018 / Accepted: 20 October 2018
        DOI: https://doi.org/10.1051/ro/2018096

        A PTAS for single-machine scheduling with release dates and job delivery to minimize makespan

        Received: 29 December 2016 / Revised: 11 September 2017 / Accepted: 28 October 2018
        DOI: https://doi.org/10.1051/ro/2018097

        DEA based production planning considering technology heterogeneity with undesirable outputs

        Received: 04 August 2016 / Revised: 18 June 2018 / Accepted: 10 November 2018
        DOI: https://doi.org/10.1051/ro/2018098

        Replenishment of imperfect items in an EOQ inventory model with partial backordering

        Received: 18 May 2017 / Revised: 26 October 2018 / Accepted: 10 November 2018
        DOI: https://doi.org/10.1051/ro/2018099

        A generalized DEA model for inputs (outputs) estimation under inter-temporal dependence

        Received: 03 February 2018 / Revised: 19 September 2018 / Accepted: 10 November 2018
        DOI: https://doi.org/10.1051/ro/2018100

        Investment for process quality improvement and setup cost reduction in an imperfect production process with warranty policy and shortages

        Received: 17 March 2018 / Revised: 09 October 2018 / Accepted: 10 November 2018
        DOI: https://doi.org/10.1051/ro/2018101

        Inventory and pricing decisions for imperfect quality items with inspection errors, sales returns, and partial backorders under inflation

        Received: 12 April 2018 / Revised: 14 October 2018 / Accepted: 10 November 2018
        DOI: https://doi.org/10.1051/ro/2018102

        Preemptive multi-skilled resource constrained project scheduling problem with hard / soft interval due dates

        Received: 13 August 2017 / Revised: 25 September 2018 / Accepted: 13 November 2018
        DOI: https://doi.org/10.1051/ro/2018103

        Randomized Control of Arrivals in a finite-buffer GI/M/1 System with Starting Failures

        Received: 10 October 2017 / Revised: 21 September 2018 / Accepted: 13 November 2018
        DOI: https://doi.org/10.1051/ro/2018104

        A common-weight DEA model for multi-criteria ABC inventory classification with quantitative and qualitative criteria

        Received: 25 November 2017 / Revised: 29 September 2018 / Accepted: 13 November 2018
        DOI: https://doi.org/10.1051/ro/2018105

        Transient and steady-state analysis of a queuing system having customers' impatience with threshold

        Received: 04 May 2018 / Revised: 29 October 2018 / Accepted: 13 November 2018
        DOI: https://doi.org/10.1051/ro/2018106

        Customer relationship management and new product development in designing a robust supply chain

        Received: 08 February 2018 / Revised: 18 October 2018 / Accepted: 13 November 2018
        DOI: https://doi.org/10.1051/ro/2018107

        A bi-level multi-objective data envelopment analysis model for estimating profit and operational efficiency of bank branches

        Received: 26 July 2017 / Revised: 25 October 2018 / Accepted: 25 November 2018
        DOI: https://doi.org/10.1051/ro/2018108

        Modelling pricing, vertical co-op advertising and quality improvement in a non-cooperative three-echelon supply chain using game theory approach

        Received: 06 November 2017 / Revised: 29 May 2018 / Accepted: 25 November 2018
        DOI: https://doi.org/10.1051/ro/2018109

        A Markov decision model with dead ends for operating room planning considering dynamic patient priority

        Received: 15 March 2018 / Revised: 01 November 2018 / Accepted: 25 November 2018
        DOI: https://doi.org/10.1051/ro/2018110

        Advertising and pricing policies in a two-echelon supply chain with a capital-constrained retailer

        Received: 07 April 2018 / Revised: 25 October 2018 / Accepted: 25 November 2018
        DOI: https://doi.org/10.1051/ro/2018111

        A continuous approximation approach for supply network design considering radio frequency identification adoption

        Received: 22 April 2018 / Revised: 21 October 2018 / Accepted: 25 November 2018
        DOI: https://doi.org/10.1051/ro/2018112

        The effect of full or partial pricing integration on supply chain management

        Received: 08 May 2018 / Revised: 29 September 2018 / Accepted: 25 November 2018
        DOI: https://doi.org/10.1051/ro/2018113

        A comprehensive study of a backlogging EOQ model with nonlinear heptagonal dense fuzzy environment

        Received: 08 July 2018 / Revised: 11 November 2018 / Accepted: 25 November 2018
        DOI: https://doi.org/10.1051/ro/2018114

        An inertial modified algorithm for solving variational inequalities

        Received: 02 March 2018 / Revised: 26 November 2018 / Accepted: 02 December 2018
        DOI: https://doi.org/10.1051/ro/2018115

        Stochastic analysis of a preemptive retrial queue with orbital search and multiple vacations

        Received: 31 January 2015 / Revised: 17 September 2017 / Accepted: 09 December 2018
        DOI: https://doi.org/10.1051/ro/2018117

        Stochastic decomposition in retrial queueing inventory system

        Received: 06 September 2016 / Revised: 06 December 2018 / Accepted: 09 December 2018
        DOI: https://doi.org/10.1051/ro/2018118

        Global distribution center number of some graphs and an algorithm

        Received: 13 June 2018 / Revised: 25 October 2018 / Accepted: 09 December 2018
        DOI: https://doi.org/10.1051/ro/2018119

        A mathematical model on eco-friendly manufacturing system under probabilistic demand

        Received: 13 September 2018 / Revised: 15 November 2018 / Accepted: 09 December 2018
        DOI: https://doi.org/10.1051/ro/2018120

        On the Preconditioned Projective Iterative Methods for the Linear Complementarity Problem

        Received: 05 July 2018 / Revised: 17 December 2018 / Accepted: 31 December 2018
        DOI: https://doi.org/10.1051/ro/2019002

        Complexity of inheritance of F-convexity for restricted games induced by minimum partitions

        Received: 22 February 2018 / Revised: 02 November 2018 / Accepted: 31 December 2018
        DOI: https://doi.org/10.1051/ro/2019003

        Picture fuzzy multi-criteria group decision-making method to hotel building energy efficiency retrofit project selection

        Received: 12 April 2017 / Revised: 03 November 2018 / Accepted: 31 December 2018
        DOI: https://doi.org/10.1051/ro/2019004

        An efficient two-phase metaheuristic algorithm for The Time Dependent Traveling Salesman Problem

        Received: 28 February 2017 / Revised: 05 November 2018 / Accepted: 31 December 2018
        DOI: https://doi.org/10.1051/ro/2019006

        Z-equilibria in Bi-matrix Games with Uncertain payoffs

        Received: 09 October 2015 / Revised: 27 September 2018 / Accepted: 31 December 2018
        DOI: https://doi.org/10.1051/ro/2019007

        An M/G/1 retrial queue with single working vacation under Bernoulli schedule

        Received: 15 February 2016 / Revised: 03 January 2019 / Accepted: 05 January 2019
        DOI: https://doi.org/10.1051/ro/2019008

        The impact of oil price changes on efficiency of banks: An application in the Middle East oil exporting countries using SORM-DEA

        Received: 09 October 2017 / Revised: 08 December 2018 / Accepted: 05 January 2019
        DOI: https://doi.org/10.1051/ro/2019009

        A neoteric approach to geometric shipment policy in an integrated supply chain with setup cost reduction and freight cost using service level constraint

        Received: 22 March 2018 / Revised: 12 November 2018 / Accepted: 11 January 2019
        DOI: https://doi.org/10.1051/ro/2019011

        An innovative four-layer heuristic for scheduling multi-mode projects under multiple resource constrains

        Received: 19 February 2018 / Revised: 27 November 2018 / Accepted: 11 January 2019
        DOI: https://doi.org/10.1051/ro/2019012

        Making high school students aware of optimization through games and puzzles

        Received: 07 October 2018 / Revised: 19 January 2019 / Accepted: 22 January 2019
        DOI: https://doi.org/10.1051/ro/2019013

        Purchasing strategy and supply chain management, the Airbus productive system case

        Received: 04 February 2018 / Revised: 22 December 2018 / Accepted: 23 January 2019
        DOI: https://doi.org/10.1051/ro/2019014

        Impact of carbon emission on imperfect production inventory system with advance payment base free transportation

        Received: 26 September 2018 / Revised: 07 January 2019 / Accepted: 23 January 2019
        DOI: https://doi.org/10.1051/ro/2019015

        An exact approach for the multicommodity network optimization problem with a step cost function

        Received: 20 February 2018 / Revised: 07 January 2019 / Accepted: 22 January 2019
        DOI: https://doi.org/10.1051/ro/2019017

        An exact minimax penalty function approach to solve multitime variational problems

        Received: 03 July 2018 / Revised: 24 December 2018 / Accepted: 02 February 2019
        DOI: https://doi.org/10.1051/ro/2019019

        The analysis of a discrete time finite-buffer queue with working vacations under Markovian arrival process and PH-service time

        Received: 16 August 2015 / Revised: 05 February 2019 / Accepted: 05 February 2019
        DOI: https://doi.org/10.1051/ro/2019020

          General lot-sizing and scheduling for perishable food products

          Received: 08 June 2017 / Revised: 31 December 2018 / Accepted: 24 February 2019
          DOI: https://doi.org/10.1051/ro/2019021

            Comparisons of customer behavior in Markovian queues with vacation policies and geometric abandonments

            Received: 11 December 2017 / Revised: 26 January 2019 / Accepted: 24 February 2019
            DOI: https://doi.org/10.1051/ro/2019023

            Joint pricing, services and quality decisions in a dual-channel supply chain

            Received: 13 June 2018 / Revised: 14 January 2019 / Accepted: 24 February 2019
            DOI: https://doi.org/10.1051/ro/2019024

              A Hybrid Fix-and-Optimize Heuristic for Integrated Inventory-Transportation Problem in a Multi-region Multi-facility Supply Chain

              Received: 18 June 2018 / Revised: 08 December 2018 / Accepted: 24 February 2019
              DOI: https://doi.org/10.1051/ro/2019025

              Inventory management strategies for the Calabrian hospitals system

              Received: 29 June 2018 / Revised: 17 January 2019 / Accepted: 24 February 2019
              DOI: https://doi.org/10.1051/ro/2019026

              Supply chain encroachment with quality decision and different power structures

              Received: 22 October 2018 / Revised: 25 January 2019 / Accepted: 21 February 2019
              DOI: https://doi.org/10.1051/ro/2019027

              Variant impatient behavior of a Markovian queue with balking reserved idle time and working vacation

              Received: 11 November 2018 / Revised: 17 February 2019 / Accepted: 25 February 2019
              DOI: https://doi.org/10.1051/ro/2019028

              Integrated vendor-buyer strategies for imperfect production systems with maintenance and warranty policy

              Received: 08 August 2018 / Revised: 15 February 2019 / Accepted: 05 March 2019
              DOI: https://doi.org/10.1051/ro/2019029

              A vendor-buyer inventory model with lot-size and production rate dependent lead time under time value of money

              Received: 12 November 2018 / Revised: 06 March 2019 / Accepted: 06 March 2019
              DOI: https://doi.org/10.1051/ro/2019030

              Decision making and coordination of fresh agriculture product supply chain considering fairness concerns

              Received: 27 March 2018 / Revised: 25 December 2018 / Accepted: 14 March 2019
              DOI: https://doi.org/10.1051/ro/2019031

              Coordination of elderly healthcare service supply chain with information asymmetry: Designs of option contracts under different demand distribution statuses

              Received: 10 July 2018 / Revised: 29 January 2019 / Accepted: 14 March 2019
              DOI: https://doi.org/10.1051/ro/2019032

              New second-order radial epiderivatives and applications to optimality conditions

              Received: 23 July 2018 / Revised: 06 March 2019 / Accepted: 14 March 2019
              DOI: https://doi.org/10.1051/ro/2019033

              Enterprise learning performance evaluation in the process of cooperative innovation using three-parameter fuzzy linguistic Heronian mean operator

              Received: 05 January 2019 / Accepted: 14 March 2019
              DOI: https://doi.org/10.1051/ro/2019034

                Store-brand introduction and production arrangement in the presence of multiple retailers

                Received: 28 June 2017 / Revised: 18 February 2019 / Accepted: 14 March 2019
                DOI: https://doi.org/10.1051/ro/2019035

                Decision policies on players’ different risk combination under supplier encroachment

                Received: 18 November 2018 / Revised: 26 March 2019 / Accepted: 27 March 2019
                DOI: https://doi.org/10.1051/ro/2019038

                  Retailer's decision selection with dual supply uncertainties under different reliability levels of serving the market

                  Received: 10 April 2018 / Revised: 20 March 2019 / Accepted: 29 March 2019
                  DOI: https://doi.org/10.1051/ro/2019040

                  New proposals for modelling and solving the problem of covering solids using spheres of different radii

                  Received: 27 September 2017 / Revised: 01 January 2019 / Accepted: 07 April 2019
                  DOI: https://doi.org/10.1051/ro/2019041

                  Production inventory model for controllable deterioration rate with shortages

                  Received: 12 September 2017 / Revised: 19 February 2019 / Accepted: 20 April 2019
                  DOI: https://doi.org/10.1051/ro/2019042

                  A non-linear-threshold-accepting function based algorithm for the solution of economic dispatch problem

                  Received: 03 March 2018 / Revised: 08 April 2019 / Accepted: 20 April 2019
                  DOI: https://doi.org/10.1051/ro/2019043

                  Symmetric duality results for second -order nondifferentiable multiobjective programming problem

                  Received: 31 July 2018 / Revised: 25 February 2019 / Accepted: 20 April 2019
                  DOI: https://doi.org/10.1051/ro/2019044

                  A restart scheme for the Dai-Liao conjugate gradient method by ignoring a direction of maximum magnification by the search direction matrix

                  Received: 28 August 2018 / Revised: 05 April 2019 / Accepted: 20 April 2019
                  DOI: https://doi.org/10.1051/ro/2019045

                  Robust bi-level risk-based optimal scheduling of microgrid operation against uncertainty

                  Received: 04 September 2018 / Revised: 26 February 2019 / Accepted: 20 April 2019
                  DOI: https://doi.org/10.1051/ro/2019046

                  Optimal production lot size under backup agreement allowing substitute products

                  Received: 05 December 2018 / Revised: 19 April 2019 / Accepted: 27 April 2019
                  DOI: https://doi.org/10.1051/ro/2019047

                  Price strategies and salesforce compensation design with overconfident sales agent

                  Received: 24 June 2018 / Revised: 31 March 2019 / Accepted: 02 May 2019
                  DOI: https://doi.org/10.1051/ro/2019048

                  Global defensive k-alliances in directed graphs: combinatorial and computational issues

                  Received: 04 October 2018 / Revised: 05 April 2019 / Accepted: 02 May 2019
                  DOI: https://doi.org/10.1051/ro/2019049

                  Multi-choice and stochastic programming for transportation problem involved in supply of foods and medicines to hospitals with consideration of logistic distribution

                  Received: 28 December 2018 / Revised: 02 April 2019 / Accepted: 02 May 2019
                  DOI: https://doi.org/10.1051/ro/2019050

                  A novel approach to safety stock management in an integrated supply chain with controllable lead time and ordering cost reduction using present value

                  Received: 05 December 2017 / Revised: 27 February 2019 / Accepted: 07 May 2019
                  DOI: https://doi.org/10.1051/ro/2019051

                  An Optimistic-Pessimistic DEA Model Based on Game Cross Efficiency Approach

                  Received: 15 July 2018 / Revised: 10 March 2019 / Accepted: 07 May 2019
                  DOI: https://doi.org/10.1051/ro/2019052

                  Strategic sourcing under recall loss sharing and product quality investment

                  Received: 07 December 2018 / Revised: 18 April 2019 / Accepted: 07 May 2019
                  DOI: https://doi.org/10.1051/ro/2019053

                  Effect of inspection errors on imperfect production inventory model with warranty and price discount dependent demand rate

                  Received: 22 February 2019 / Revised: 16 April 2019 / Accepted: 06 May 2019
                  DOI: https://doi.org/10.1051/ro/2019054

                  The Karush-Kuhn-Tucker conditions for multiple objective fractional interval valued optimization problems

                  Received: 14 January 2019 / Revised: 10 May 2019 / Accepted: 10 May 2019
                  DOI: https://doi.org/10.1051/ro/2019055

                  Economic lot-size problem for a cleaner manufacturing system with warm-up period

                  Received: 11 February 2019 / Revised: 22 April 2019 / Accepted: 22 May 2019
                  DOI: https://doi.org/10.1051/ro/2019056