Journal of the Operations Research Society of Japan

[title in Japanese]

Article type: Cover
2008 Volume 51 Issue 4 Pages Cover10-
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.Cover10

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[title in Japanese]

Article type: Appendix
2008 Volume 51 Issue 4 Pages App7-
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.App7

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NOTE ON THE CONTINUITY OF M-CONVEX AND L-CONVEX FUNCTIONS IN CONTINUOUS VARIABLES

Kazuo Murota, Akiyoshi Shioura

Article type: Article
2008 Volume 51 Issue 4 Pages 265-273
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.265

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M-convex and L-convex functions in continuous variables constitute subclasses of convex functions with nice combinatorial properties. In this note we give proofs of the fundamental facts that closed proper M-convex and L-convex functions are continuous on their effective domains.

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A GAME-THEORETIC APPROACH FOR DETERMINING THE ECONOMIC MANUFACTURING QUANTITY AND MUTUAL INSPECTION POLICY UNDER A QUALITY CONTRACT

Chih-Hsiung Wang

Article type: Article
2008 Volume 51 Issue 4 Pages 274-283
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.274

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In this study, we deal with the optimal mutual inspection policies (OMIP) for a manufacturer and its downstream member (buyer) under a quality contract subject to the probability of non-conforming for each unit is transparent between the manufacturer and buyer. A game-theoretic framework is developed for both parties to determine their OMIP. Main difference between this study and related previous works is that in this research the full inspection policy will never be optimal for the manufacturer when a quality contract is considered. Based on this OMIP, we show how the OMIP is incorporated into the determination of optimal production lot size. To achieve an economical production under the defined contract, tradeoffs between manufacturing cost, inventory holding cost and quality related cost must be analyzed. Some properties for the optimal lot size are obtained. Numerical examples are performed to illustrate the optimal production lot size and OMIP.

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ENHANCEMENT OF SCHEDULING RELIABILITY IN BUILDING PROJECT USING THEORY OF CONSTRAINT

Min-Lan Yang, Tsung-Chieh Tsai

Article type: Article
2008 Volume 51 Issue 4 Pages 284-298
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.284

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Most building projects neglect that despite minimizing the project duration, the uncertainty of constraints, such as the uncertainties of personnel, machine, or weather still jeopardizes the project scheduling reliability and influences the resources arrangement causing the project duration overrun. The contractor must combine the project scheduling with planning to reduce the uncertainty of the project activities and project duration. This study attempted to improve the relationship between activities, revise the uncertainty of activities, and reduce the uncertainty of schedule to enhance the reliability of building project scheduling by applying the concepts of Theory of Constraint (TOC). To demonstrate the effects on the reliability improvement in building project scheduling by the application of TOC, the authors take one high-rise building constructed in Taiwan as a case study to illustrate enhancement of scheduling reliability. The simulation results are compared to Program Evaluation and Review Technique (PERT) simulation. The comparisons illustrate that the DBR proposed model can enhance the reliability of schedule planning.

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AN EVALUATION METHOD FOR ENTERPRISE RESOURCE PLANNING SYSTEMS

Shin-Guang Chen, Yi-Kuei Lin

Article type: Article
2008 Volume 51 Issue 4 Pages 299-309
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.299

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An Enterprise Resource Planning (ERP) system is a complex network composed of various business processes. This paper proposes a method based on stochastic-flow network model to evaluate the performance of an ERP system depending upon the results of the ERP examination of the users involved. The nodes in the network denote the persons responsible for the business tasks during the processes. The arcs between nodes denote the process precedence relationships in the ERP system. When the process starts, the documents are initiated from the source node to its succeeding nodes. Finally, the documents are released in the destination node. Thus, the performance of an ERP system is related to the flow of the documents through the network. The failure of an ERP system is therefore described as in the condition that the flow of the system is under the acceptable level d. We propose a performance index, the probability of the maximal flow not less than d, to evaluate the performance of an ERP system. An algorithm is subsequently proposed to generate the performance index, which can be used to assess the system performance either before or after the system going live.

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A NOTE ON GLOBALLY CONVERGENT NEWTON METHOD FOR STRONGLY MONOTONE VARIATIONAL INEQUALITIES

Kouichi Taji

Article type: Article
2008 Volume 51 Issue 4 Pages 310-316
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.310

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Newton's method for solving variational inequalities is known to be locally quadratically convergent. By incorporating a line search strategy for the regularized gap function, Taji et al. (Mathematical Programming, 1993) have proposed a modification of a Newton's method which is globally convergent and whose rate of convergence is quadratic. But the quadratic convergence has been shown only under the assumptions that the constraint set is polyhedral convex and the strict complementarity condition holds at the solution. In this paper, we show that the quadratic rate of convergence is also achieved without both the polyhedral convex assumption and the strict complementarity condition. Moreover, the line search procedure is simplified.

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[title in Japanese]

Article type: Appendix
2008 Volume 51 Issue 4 Pages 318-319
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.318

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[title in Japanese]

Article type: Index
2008 Volume 51 Issue 4 Pages 320-321
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.320

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[title in Japanese]

Article type: Index
2008 Volume 51 Issue 4 Pages 322-324
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.322

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[title in Japanese]

Article type: Appendix
2008 Volume 51 Issue 4 Pages App8-
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.App8

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[title in Japanese]

Article type: Cover
2008 Volume 51 Issue 4 Pages Cover11-
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.Cover11

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[title in Japanese]

Article type: Cover
2008 Volume 51 Issue 4 Pages Cover12-
Published: 2008
Released on J-STAGE: June 27, 2017

DOIhttps://doi.org/10.15807/jorsj.51.Cover12

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