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손권익(Sohn Kwon lk),최승국(Choi Seoung Kug) 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.1
The determination of lot sizes in prevailing inventory problems has been made with constant safety stock over the planning horizon. But, it is more profitable to accommodate the safety stock to dynamically fluctuation demands. The objective of this paper is to study the method to determaine the dynamic safety stock and lot sizing rules depending on the actual customer demands. The last period or highly fluctuation period during the consumption of a lot is the most critical one to stock-out. It means that such periods must be given more attentions. Some dynamic methods to control safety stock are proposed with viewpoints of the time, quantity, and time-quantity. Simulation results show that lot sizing methods with dynamic safely stock reduce about 10% of average total cost compared to those with constant safety stock.
수치모형실험을 통한 콘크리트 구조물의 결함탐지에 관한 연구
김용인(Kim Yong In),변중무(Byun Joong Moo),손권익(Sohn Kwon lk),서백수(Suh Baek Soo) 강원대학교 산업기술연구소 2004 産業技術硏究 Vol.24 No.1
In this study, First, the results of travel-time inversion (first arrival inversion using the travel-time of the first arrival) were compared with those of full-wave inversion for numerical data. Numerical experiments to find key parameters other than initial velocity model showed that the frequency of source has a great effect on the result of full-wave inversion. Finally, this research presented the corrected full-wave inversion applying the correction term to the final result of full-wave inversion. The corrected full-wave inversion depicted cavities inside concretes even when the inversion started with 20% error in an initial velocity model for cavities. However, full-wave inversion did not reveal cavities.