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Abstract An efficient global-local hybrid optimization method is developed combining a genetic algorithm (GA) as a global optimizer and a method of feasible direction (MFD) as a local optimizer. During the global iteration using GA, the design sensitivity information with respect to design variables is used to perform a what-if study for efficient crossover. After the final global iteration, a local optimization can be followed to further improve the solution obtained from GA. The developed global-local hybrid optimization method is applied to simple mathematical problems to compare the efficiency and accuracy of the proposed method with that of the conventional genetic algorithm. The objective function using the proposed method converges to the optimum much faster than the conventional GA. It is also able to find the global optimum very quickly even though the starting point is near a local minimum. The proposed method finds the known solution of the mathematical problems very quickly whereas the conventional GA sometimes fails to find the exact solution even though it requires more iteration. The application of the developed method is also extended to the practical engineering problems, which shows very good and efficient results.
Publication Date 2000-10-26

Kyu-Yeul Lee, Seon-Ho Cho, Myung-Il Roh, "An Efficient Global-Local Hybrid Optimization Method Using Design Sensitivity Analysis", Proceedings of OptiCon 2000, Newport Beach, USA, pp. 1-13, 2000.10.26-27

List of Articles
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15 International Conference Ji-Hyun Hwang, Young-Joo Ahn, Joon-Ho Min, Gwang-No Lee, Ho-Jin Jeong, Mung-Yu Kim, Hee-Chang Kim, Myung-Il Roh, Kyu-Yeul Lee, "Application of an Integrated Basic Process Engineering Solution to Generic LNG FPSO Topsides", Proceedings of ISOPE 2009 file 2009-06-21
14 International Conference Ji-Hyun Hwang, Ju-Hwan Cha, Seung-Ho Ham, Bo-Ram Kim, Myung-Il Roh, Kyu-Yeul Lee, "Establishment of Offshore Process FEED Method for Oil-Based FPSO Topsides Systems", Proceedings of ISOPE 2009, Osaka, Japan, pp. 144-150, 2009.06.21-26 file 2009-06-21
13 International Conference Ju-Hwan Cha, Seung-Ho Ham, Kyu-Yeul Lee, Myung-Il Roh, Kwang-Pil Park, Heung-Won Suh, "Discrete Event/Discrete Time Simulation of Block Erection by a Floating Crane based on Multibody System Dynamics", Proceedings of ISOPE 2009, Osaka, Japan file 2009-06-21
12 International Conference Ji-Hyun Hwang, Joon-Ho Min, Young-Joo Ahn, Hee-Chang Kim, Myung-Il Roh, Kyu-Yeul Lee, "Optimized Methodology to Build an Integrated Solution to Offshore Topside Process Engineering", Proceedings of ISOPE 2008, Vancouver, Canada, 2008.07.06-11 file 2008-07-06
11 International Conference Ju-Hwan Cha, Myung-Il Roh, Seung-Ho Ham, Kyu-Yeul Lee, Kwang Phil Park, Heung Won Suh, "Development of an Integrated Simulation Framework and Its Application to Shipbuilding Process Planning", Proceedings of ICCAS(International Conference on Computer Applications in Shipbuilding) 2007, Portsmouth, UK, pp. 283-290, 2007-09.18-20 file 2007-09-18
10 International Conference Kyu-Yeul Lee, Myung-Il Roh, Ju-Hwan Cha, "Development of a Non-linear Optimization Program and Its Applications to Shipbuilding", Proceedings of the 1st Mongolia-Korea Joint Workshop on CAD/CAM, Ulaanbaatar, Mongolia, pp. 1-5, 2007.07.08-10 file 2007-07-08
9 International Conference John-Kyu Hwang, Myung-Il Roh, Ji-Hyun Hwang and Ju-Hwan Cha, Kyu-Yeul Lee, "Overview on Detailed Design and Construction of 2,000,000BBLS FPSO", Proceedings of Design & Construction of FPU(Floating Production Units) 2007, Suntec, Singapore, pp. 1-6, 2007.04.03 file 2007-04-03
8 International Conference Myung-Il Roh, Kyu-Yeul Lee, Seong-Jin Yoo, "An Algorithm for Generating the Hull Structural Analysis Model Using the Seam Information of the Hull Structure", Proceedings of the 2nd PAAMES and AMEC 2006, Jeju, Korea, pp. 399-404, 2006.10.17-20 file 2006-10-17
7 International Conference Myung-Il Roh, Kyu-Yeul Lee, "Generation of Production Information for a Building Block and Simulation of the Block Erection for Computer-Aided Process Planning and Scheduling", Proceedings of IMDC(International Marine Design Conference) 2006, Michigan, USA, pp. 382-395, 2006.05.16-19 file 2006-05-16
6 International Conference Kyu-Yeul Lee, Myung-Il Roh, Sang-Uk Lee, Joong-Hyun Rhim, Seong-Chan Kang, Jong-Hyun Kim, Jeong-Youl Lee, "Development of a Hull Structural CAD System for an Initial Design Stage", Proceedings of PRADS 2004, Germany, pp. 98-105, 2004.09.12-17 file 2004-09-12
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