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유연한 중간저장탱크 사용이 가능한 공유된 중간 저장탱크 방안에서의 다품종 회분식 공정 생산계획
정재학,이인범,장근수,양대륙 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.2
회분식 다품종용 생산공정에서 mixed intermediate storage(MIS) 방안보다 더 효율적인 중간저장탱크 방안으로써 common intermediate storage(CIS) 방안을 제안한다. CIS 방안은 MIS 방안의 한 블록으로써 연구되어진 shared storage 시스템의 전 공정으로의 확장으로 볼 수 있으며, 장치 사이의 변화될 수 있는 저장탱크 방안을 표현해 줄 수도 있어 각 장치사이의 변화되는 저장탱크 방안에 유연하게 대처할 수도 있다. 또한 CIS 방안의 새롭고 간결한 완료시간 결정 알고리듬을 개발하였고, 이를 이용하여 CIS 방안에 대한 2가지 생산계획법을 적용해 보았다. 첫째 10개 이하의 제품의 문제만을 다룰 수 있지만 최적값을 항상 제공하는 combinatorial search 알고리듬이며, 둘째 항상 최적치를 얻지는 못하나 제품 11개 이상의 큰 문제에서 매우 효율적인 simulated annealing방법이다. 다품종 공정에서 각 생산 사이클에 따라 생산해야할 제품의 종류가 바뀌는 경우, 그에 따라 각 장치 사이에서 저장탱크사용 방안이 변화되는 경우가 있다. 이 때 CIS 방안과 적당한 on/off 밸브와 펌프 등을 이용해 변화하는 저장탱크 방안을 표현해 줄 수 있다. 또한 CIS 방안의 단점인 조업의 복잡성과 그에 따른 안전성문제를 극복하기 위한 safety interlock을 구성하였으며, 기초적인 회분식 다품종 생산공정의 자동화 모델의 한 부분을 제시하였다. In this study, we propose the common intermediate storage(CIS) policy which is more efficient than mixed intermediate storage(MIS) policy. The CIS policy is a form of shared storage system, which is extended to overall processes and can be applied to flexible inter-stage intermediate storage policies. Using this strategy, we developed a new completion time algorithm and applied it to two kinds of optimal or near optimal scheduling method; the combinatorial search and the simulated annealing method. We also extended the CIS policy for flexible operation of intermediate storage policy with proper on/off electronic valves and pumps. It thus can be accepted as a basic form of FMS(Flexible Manufacturing System) for operating various storage policies. Finally we suggested the PLC logic of safety interlock to complement the difficult application of CIS policy, i.e, complication of operation and safety, resulting in a part of basic batch process automation mode.
대장 및 소장 게실에서 표준 복강경수술과 수보조 복강경 수술의 비교
정재학,김창남,박진석,김종엽,조병선,이민구,최영진,강윤중,박주승 대한대장항문학회 2009 Annals of Coloproctolgy Vol.25 No.6
Purpose: In complicated diverticular disease, hand-assisted laparoscopic surgery (HALS) has been considered as a useful alternative treatment to standard laparoscopic surgery (SLS) and open surgery. As compared with standard laparoscopic surgery, HALS offers advantages such as tactile sense, better exposure, and shorter learning curve. Minimally invasive surgery is another advantage of HALS. The aim of this study was to compare SLS to HALS in patients with diverticular diseases of the small bowel and the colon. Methods: We retrospectively reviewed the records of 32 patients who had undergone SLS and HALS for diverticular disease between February 2002 and March 2009. Results: Of the 32 patients, 20 patients (62.5%) were in the SLS group, and 12 patients (37.5%) were in the HALS group. The mean maximal incision length was longer in the HALS group (SLS group vs. HALS group, 4.5 vs. 7.4 cm, P<0.001). However, the mean operating time, the time to flatus, the time to diet, the mean duration of narcotic analgesia, the length of hospital stay, and the postoperative complications were similar. There was no mortality in either group. Conclusion: The longest incision length for the HALS group was longer than that for the SLS group, but HALS could reduce the conversion rate and has the many advantages of minimally invasive surgery. For complicated diverticular disease, HALS may be considered as a useful alternative treatment. Purpose: In complicated diverticular disease, hand-assisted laparoscopic surgery (HALS) has been considered as a useful alternative treatment to standard laparoscopic surgery (SLS) and open surgery. As compared with standard laparoscopic surgery, HALS offers advantages such as tactile sense, better exposure, and shorter learning curve. Minimally invasive surgery is another advantage of HALS. The aim of this study was to compare SLS to HALS in patients with diverticular diseases of the small bowel and the colon. Methods: We retrospectively reviewed the records of 32 patients who had undergone SLS and HALS for diverticular disease between February 2002 and March 2009. Results: Of the 32 patients, 20 patients (62.5%) were in the SLS group, and 12 patients (37.5%) were in the HALS group. The mean maximal incision length was longer in the HALS group (SLS group vs. HALS group, 4.5 vs. 7.4 cm, P<0.001). However, the mean operating time, the time to flatus, the time to diet, the mean duration of narcotic analgesia, the length of hospital stay, and the postoperative complications were similar. There was no mortality in either group. Conclusion: The longest incision length for the HALS group was longer than that for the SLS group, but HALS could reduce the conversion rate and has the many advantages of minimally invasive surgery. For complicated diverticular disease, HALS may be considered as a useful alternative treatment.