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89 results on '"Kim, Min-Geun"'

20. Scheduling algorithms for remanufacturing systems with parallel flow-shop-type reprocessing lines.

Author

Kim, Min-Geun, Yu, Jae-Min, and Lee, Dong-Ho

Subjects
REMANUFACTURING, FLOW shop scheduling, HEURISTIC, RADIOACTIVE waste sites, PRODUCT recovery, PROFIT margins
Abstract

This study considers a scheduling problem for remanufacturing systems in which end-of-life products are separated into their major components at a disassembly workstation, each of them is reprocessed at its dedicated flow-shop-type reprocessing line with serial workstations, and finally, the reprocessed components, together with new components if required, are reassembled into remanufactured products at a reassembly workstation. Among various system configurations, we focus on the one with parallel flow-shop-type reprocessing lines since it is a typical remanufacturing configuration. The problem is to determine the sequence of products to be disassembled, the sequence of components to be reprocessed at each workstation of flow-shop-type reprocessing lines and the sequence of products to be reassembled for the objective of minimising the total flow time. An integer programming model is developed to represent the problem mathematically, and then, three types of heuristics, i.e. priority rule-based heuristic, Nawaz–Enscore–Ham-based heuristic and iterated greedy algorithm, are proposed due to the problem complexity. To show the performances of the heuristics, a series of computational experiments were done on various test instances, and the results are reported. [ABSTRACT FROM PUBLISHER]

Published
2015
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28. Level Set Based Shape Optimization of Linear Structures using Topological Derivatives

Author

Yoon Minho, Ha Seung-Hyun, Kim Min-Geun, and Cho Seonho

Subjects
Level set method, Level set, Topology optimization, Boundary (topology), Shape optimization, Topological derivative, Limit (mathematics), Descent direction, Topology, Mathematics
Abstract

Using a level set method and topological derivatives, a topological shape optimization method that is independent of an initial design is developed for linearly elastic structures. In the level set method, the initial domain is kept fixed and its boundary is represented by an implicit moving boundary embedded in the level set function, which facilitates to handle complicated topological shape changes. The “Hamilton-Jacobi(H-J)” equation and computationally robust numerical technique of “up-wind scheme” lead the initial implicit boundary to an optimal one according to the normal velocity field while minimizing the objective function of compliance and satisfying the constraint of allowable volume. Based on the asymptotic regularization concept, the topological derivative is considered as the limit of shape derivative as the radius of hole approaches to zero. The required velocity field to update the H-J equation is determined from the descent direction of Lagrangian derived from optimality conditions. It turns out that the initial holes are not required to get the optimal result since the developed method can create holes whenever and wherever necessary using indicators obtained from the topological derivatives. It is demonstrated that the proper choice of control parameters for nucleation is crucial for efficient optimization process.

Published
2014

35. Kidult Contents Development using Mobile Augmented Reality

Author

Song Eun Jee, Kim Young Mi, Kim Ji Hye, and Kim Min Geun

Subjects
Multidisciplinary, Development (topology), Multimedia, Computer science, Augmented reality, Convergence (relationship), computer.software_genre, computer
Abstract

Game-type kidult toys based on Augmented Reality (AR) have been introduced to the market and they have attracted much interest from users. It seems time to view this trend from various perspectives, not just that of games, and to try to discuss the issue in terms of convergence with other disciplines. The current paper aims to perform a comparative analysis of IT technology-based kidult toys and develop new kidult culture contents utilizing AR. The results of the present research are expected to help vitalize and expand the area of AR-based culture contents.

Published
2015

50. Level Set Based Shape Optimization of Geometrically Nonlinear Structures.

Author

Gladwell, G. M. L., Bendsøe, Martin Philip, Olhoff, Niels, Sigmund, Ole, Cho, Seonho, Ha, Seung-Hyun, and Kim, Min-Geun

Abstract

Using the level set method and topological derivatives, a topological shape optimization method that is independent of initial topology is developed for geometrically nonlinear structures in Total Lagrangian framework. In nonlinear topology optimization, response analysis may not converge due to relatively sparse material distribution driven by the conventional topology optimization such as homogenization and density methods. In the level set method, the initial domain is kept fixed and its boundary is represented by an implicit moving boundary embedded in the level set function, which facilitates to handle complicated topological shape changes. The “Hamilton-Jacobi” (H-J) equation and computationally robust numerical technique of “up-wind scheme” lead the initial implicit boundary to an optimal one according to the normal velocity field while both minimizing the objective function of instantaneous structural compliance and satisfying the required constraint of allowable material volume. In this paper, based on the obtained level set function, structural boundaries are actually represented in the response analysis. The developed method is able to create holes whenever and wherever necessary during the optimization and minimize the compliance through both shape and topological variations at the same time. The required velocity field in the initial domain to update the H-J equation is determined from the descent direction of Lagrangian derived from optimality conditions. The rest of velocity field is determined through a velocity extension method. Since the homogeneous material property and explicit boundary are utilized, the convergence difficulty is effectively prevented. [ABSTRACT FROM AUTHOR]

Published
2006
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