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손권익(Sohn, Kwon-Ik) 강원대학교 산업기술연구소 2016 産業技術硏究 Vol.36 No.1
This paper presents EMQ models in which some proportion of defective items are produced and some of them are converted to good items through rework process and items not converted are disposed. Numerical models are developed for three cases of disposal and optimal solution of each model is derived. In the first model, if a defective item is found during the production process, only re-workable items are stored and reworked after normal production is finished. Not re-workable items are disposed immediately during normal production. The second model deals with the case where all defective items are stored and items to be disposed are determined in rework process. In the third model, an additional inspection process exists before rework to determine rework or disposal. Numerical examples are presented to validate the proposed models.
칸반시스템에서 수요와 도착간격 변동에 따른 컨테이너 크기에 관한 시뮬레이션 연구
손권익,함성호,Sohn, Kwon-Ik,Ham, Sung-Ho 강원대학교 산업기술연구소 1999 産業技術硏究 Vol.19 No.-
The purpose of this paper is to study the effects of container size with multi-stage and multi-item on average inventory and customer service level in Kanban systems. We use the different distributions of demand and interarrival time for each item to show that we had better to change the container size depending on different type of item for this simulation study. The small lot size can be used for container size of a single item if there is no setup time. The container size should be identical with average order size as setup time increases. The fill rate increases if the container size is large with multi-item. However, it is difficult to establish the effective container size because the effects of the container size on the order queue time are not clear. It is suitable to use the average order size as the container size for each item if the variance of demand and interarrival time of each item is relatively small. It is effective to sue the average container size if the variance of them is relatively large.
노후된 콘크리트 구조물의 안전도 평가를 위한 초음파기법의 주파수 및 시간영역 해석에 관한 연구
서백수(Backsoo Suh),손권익(Kwon-Ik Sohn) 한국암반공학회 2005 터널과지하공간 Vol.15 No.5
콘크리트 비파괴 검사를 위하여 배면공동모형과 교량공동모형에 대하여 시간영역 탐사와 주파수영역 탐사를 실시하였다. 시간영역 탐사는 초동주시 역산법을 이용하여 토모그래피를 작성하여 공동의 여부를 해석하였다. 주파수영역 탐사는 시간영역 기록을 푸리에 변환에 의한 주파수영역에서의 최대 주파수를 분석하여 해석하였다. For non-destructive testing of concrete structures, time and frequency domain method were applied to detect cavity in underground model and pier model. To interpret the measured data, time domain method made use of tomography which was completed with first arrivaltime and inversion method. In this steady, frequency domain method using Fourier transform was tried. Maximum frequency in the frequency domain was analyzed to calculate location of cavity.
서백수 ( Baek Soo Suh ),손권익 ( Kwon Ik Sohn ) 대한지질공학회 2007 지질공학 Vol.17 No.4
터널탐사의 탄성파 자료처리 기법에는 주시 토모그램 방법이 많이 이용되어 왔다. 현장자료는 이론 자료와는 달리 파동원과 수신기의 거리 증가에 따른 도착 시간의 차이가 작기 때문에, 피킹과 같은 작은 오차에도 계산 결과는 큰 오류를 범할 수 있다. 본 연구에서는 이러한 문제점을 극복할 수 있는 진폭법과 오차 토모그램 방법을 시도하였으며, 앞으로 현장 자료 처리에 많은 도움을 줄 수 있을 것이다. Traveltime tomogram is generally used for interpretation of seismic tunnel data. In the field data, the first arrival traveltime is less dispersive with increasing source-receiver seperation compared to theoretical model data. So the result of calculation can be serious despite of small errors such as traveltime picking. In this study, amplitude method and error tomogram method are tried to overcome these problems. This method will help the interpretation of the data from the underground tunnel.
손권익,이정민 江原大學校 産業技術硏究所 2001 産業技術硏究 Vol.21 No.B
Distribution System is considered as the most important part of SCM when the satisfaction of customer demand is considered. This paper focus on the backorder policies for stockout which is occurred in each regional distribution center of two-echelon distribution system facing stochastic demand process. Four concepts for the efficient system operation are suggested. First, at least 30% reduction of stockout is achieved by introduction of 50/25 allocation policy to distribution system. Second, transportation cost and lead-time of backorder are decreased by allowance of internal supply between regional distribution centers. Third, the frequency of emergency supply is minimized by application of Ship-up-to- expected-demand backorder policies. Finally we suggest several effective rules to select multi-internal suppliers. Simulation tests show the efficiency of our backorder policies and enhancement of customer service level.
손권익,최승국 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A
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.
유한 대수의 다종 수송수단을 고려한 동적 생산-수송 모형
손권익 江原大學校 産業技術硏究所 2009 産業技術硏究 Vol.29 No.A
This study deals with the single-product production and transportation model with dynamic demand over finite time horizon, in which the optimal production(order) quantities, transportation modes and the number of each vehicles are determined simultaneously. The finite number of identical vehicles with capacity constraint is given to each mode. Production and transportation costs are assumed to be concave function for generality. For a relevant mathematical model formulated, the theorems and properties are discussed to present the efficient algorithm. A numerical example is solved to illustrate the algorithm developed.