Parallel Sessions

Parallel Sessions : RD07 Contributed Session

OR Methodologies Room: M31

Chair: Esma Gel Arizona State University

: RD09

1 : Optimizing a Linear Function over the Integer Efficient Set. Djamal Chaabane, USTHB; Abbas, Moncef.

Chair: Sanghyeok Seo Korea University

In this communication a method for optimizing a linear function over the integer pareto-optimal set without having to determine all integer efficient solutions is presented. A linear objective function is to be optimized over the integer efficient set. The method is mainly based on a simple selection technique that improves the linear objective value at each iteration. The optimal solution is reached without having to enumerate all the efficient solutions using simple simplex procedure

1 : A Framework for Modeling Coordination Mechanisms in Complex Supply Chains. Pankaj Chandra, Indian Institute of Management Ahmedabad; Tirupati, Devanath.

2 : Benders and Lagrangean Relaxation Decomposition to Solve a Hydrothermal Coordination Problem with Binary Variables. Santiago Cerisola, Universidad Pontificia Comillas; Ramos, Andres.

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Finally, the procedure is tested.

Stochastic models resolutions usually rely on the application of a decomposition method that makes the underlying problem suitable to be solved via the application of a L-Shaped type algorithm. Convexity of the recourse function is an important assumption to guarantee algorithm well behaviour. When binary variables are introduced within the model, this convexity property is lost and nonlinear duality is applied with the purpose of convexifying the recourse function. On the paper it is presented recent experiments about the combination of the Benders decomposition algorithm and Lagrangean relaxation to solve the deterministic equivalent of a stochastic medium term hydrothermal model. 3 : Reliability Analysis of MEMS Switches for High Power Applications. Esma Gel, Arizona State University; Hubele, Norma; Heydt, Gerald; Karady, George. We perform the failure analysis of a matrix configuration of switches in series and parallel using a Markov Chain. The concept is to use lower voltage and current-rating MEMS switches in series and parallel to attain the higher ratings needed in power engineering applications. In particular, we consider switch failure probabilities that depend on the voltage and current, and are interested in questions such as the expected lifetime of a given configuration and maintenance options. Representative results are illustrated and applications for urban and military ship power distribution systems are suggested. 4 : Resource Investment Problem with Discounted Cash Flows. Amir Abbas Najafi, Sharif University of Technology; Akhavan Niaki, Seyed Taghi. The vast majority of the project scheduling methodologies in literature has been developed with the objective of minimizing the project duration. In doing so, the financial aspects of project management are largely ignored. In this paper, we focused on project scheduling with the objective of maximizing the net present value. At first, we review the literature of this filed, then we introduce a new problem, named Resourse Investment Problem with Discounted Cash Flows (RIPDCF). The mathematical formulation is presented, and proved that the problem is NP-hard. Then we offer a heuristic procedure to solve RIPDCF.

Contributed Session

Supply Chain Management - C6 Room: L15

We develop models to analyze some coordination mechanisms used in industry. The motivation for this work comes from practices of AMUL for managing the supply chain of the dairy industry in India. The chain linking thousands of producers of milk and millions of consumers is large and complex and a variety of coordinating mechanisms are used for coordination. These include price driven mechanisms, coordination of product allocations and production plans, and managing inventory in the chain. The objective of this research is to develop a framework for analyzing alternate coordination mechanisms to obtain insights for management of such supply chains. 2 : An Empirical Study on the Effect of Supply Chain Structure and Direction to Business Performance. Chang Juck Suh, Sogang University; Kim, Heetak; Kim, Jae Hwan; Kwon, Yeong Hoon. This research addresses the effective policy designing the SC(supply chain) to enhance the business performance. The research model includes SC structure, identified by the type of SC and the level of locational dispersion of SC, and direction. This paper studies the effect of SC structure and direction to business performance empirically. The data set was obtained from 129 venture manufacturing firms which had the characteristics of both supplier and purchaser. The results showed that the SC pursuing a higher externality had higher financial performances. And it was found that the firms well aligned with environment and strategy had high performances. 3 : Negotiation Mechanism for Information Revealing in Supply Chain with Asymmetric Information. Sanghyeok Seo, Korea University; Kim, Sung-Shick; Kang, Yong-Ha. For supply chains, a negotiation mechanism that induces revealing of the others’ private information is investigated. The purpose of developing such mechanism is to make a contract that satisfies each node in supply chains. In supply chains, it is common that one node lacks some important information that at least one of the other nodes possesses. Activities such as accepting or rejecting of a contract and making or canceling a proposal could make your private information more public. Each node learns something whenever the others do something. Under the mechanism all nodes keep improving their own strategies as time advances.

: RD10 Contributed Session Chair: Müjde Erol Genevois Galatasaray University

Supply Chain Management - C7 Room: L19