http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
반도체 생산라인에서 SA를 이용한 최적 WIP수준과 버퍼사이즈 결정
정재환,장세인,이종환,Jeong, Jaehwan,Jang, Sein,Lee, Jonghwan 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.3
The domestic semiconductor industry can produce various products that will satisfy customer needs by diversifying assembly parts and increasing compatibility between them. It is necessary to improve the production line as a method to reduce the work-in-process inventory (WIP) in the assembly line, the idle time of the worker, and the idle time of the process. The improvement of the production line is to balance the capabilities of each process as a whole, and to determine the timing of product input or the order of the work process so that the time required between each process is balanced. The purpose of this study is to find the optimal WIP and buffer size through SA (Simulated Annealing) that minimizes lead time while matching the number of two parts in a parallel assembly line with bottleneck process. The WIP level and buffer size obtained by the SA algorithm were applied to the CONWIP and DBR systems, which are the existing production systems, and the simulation was performed by applying them to the new hybrid production system. Here, the Hybrid method is a combination of CONWIP and DBR methods, and it is a production system created by setting new rules. As a result of the Simulation, the result values were derived based on three criteria: lead time, production volume, and work-in-process inventory. Finally, the effect of the hybrid production method was verified through comparative analysis of the result values.
허강철 ( Kangcheol Huh ),장세인 ( Sein Jang ),장경수 ( Kyungsu Jang ) 국군의무사령부 2013 대한군진의학학술지 Vol.44 No.1
This study is designed to evaluate the corrective lens use by Air Force aviators. 781 aviators with having placed orders for aviators spectacles between 2006 and 2012 were retrospectively reviewed. Currently 34% of all aviators require corrective spectacles use to perform flight duties and of which 90% uses soft Contact lenses simultaneously. Refractive errors of ROKAF aviators are characterized by low levels of myopia or hyperopia. However the compatibility of spectacles and Contact lenses remains an important consideration while flight duties. Thus Refractive surgery was approved for aviators in 2007 can reduce the number of aviators that must rely on spectacles while flight duties.