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홍석우(S. W. Hong),박명철(M. C. Park),김성근(S. G. Kim) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
한국원자력연구원 조사 후 연료시험시설(PIEF)에는 핵연료 연구개발 지원, 성능평가 및 손상 원인 규명 등 핵연료의 건전성을 평가할 목적으로 운영되는 시설이다. 이러한 목적으로 수차례에 걸쳐 집합체를 포함해 총 1,699 봉의 사용 후 핵연료를 운반하여 시설 내 저장 수조에 안전하게 보관하고 있으며, 이들 중 일부를 다양한 파괴 및 비파괴시험을 수행한 후, 시편과 절편 형태로 보관 중이다. 최근의 집합체는 상단고정체를 고정할 때 볼트 또는 Bulge Joint 방식을 활용하지만, 과거 고리 1 호기의 집합체는 용접방식으로 상단고정체를 고정하였다. 따라서 핵연료봉을 인출하기 위해서는 상단고정체와 안내관 사이를 절단해야 했으며, 이로 인해 상단고정체가 해체된 상태의 집합체를 컨테이너에 담아 수조에 보관하고 있다. 상단고정체가 없는 집합체는 취급성이 상실되어 컨테이너에서 꺼낼 수 없는 상태이므로 향후 집합체 운반을 위해서는 취급성을 복원하여야 한다. 때문에 앵커볼트 방식의 집합체 복원 부품을 개발하였다. 본 논문에서는 개발한 안내관 앵커볼트를 모사안내관에 적용해 체결력을 평가하였다. 요구되는 최소 하중 이상의 체결력이 나타나는 것을 확인한 후, 실제 사용후핵연료 집합체의 안내관 절편에 개발된 앵커볼트를 적용하여 체결력 시험을 수행하였다. 그 결과, 1 개의 앵커볼트가 400 kg 이상의 하중에도 슬립이 발생하지 않았다. 총 8 개의 앵커볼트를 상단 고정체 해체집합체에 적용할 계획인데, 단순 계산상 3.2 톤 이상의 하중을 버틸 수 있으므로, 600 kg 내외의 집합체 무게를 문제없이 지지할 수 있을 것으로 판단된다.
손상 상태에서의 반잠수식 해양구조물의 운동 응답 및 표류력에 관한 연구
박노식(R. S. Park),김성근(S. C. Kim),김종현(J. H. Kim) 한국해양공학회 1988 韓國海洋工學會誌 Vol.2 No.2
For the purposes of drilling oil field and extracting oil deep water in more rough weather, the size of drilling rigs has been much increased.<br/> In the case of semi-submersible drilling rigs, which are operating under environmental loads such as those due to wave, wind and current etc., the motion responses and drift forces of the drilling rigs must be estimated.<br/> In this paper, the three dimensional source distribution method is used and we assume 10 deg, heeling and trimming condition of the drilling rig (SR-192). Also, the effects of the hydrodynamic forces which include the drift forces for field method, and the motion responses are studied with changing the incident wave direction in the assumed inclining condition. The theory and numerical codes used in this thesis appeared to be very useful for the preliminary design of drilling rigs.
鄭民煥,李錫南,朴昌植,丁小鳳,金成根 경희대학교 체육과학연구소 1978 體育學論文集 Vol.6 No.-
In the result of the research on the interests to the physical strength code system of boy high school (Comparison) of advancing to higher education and nonadvancing to higher education), it was possible to deduce the following conclusion and the suggestions from the theoretical background and the assumptions mentioned above forwarded by this research. 1. The understanding in the system of P.S.C. in inefficient. 2. The system failed to provide to one's strengh buiding 3. The training for P.S.C. is always not practiced consistently but being exercised on the immediate of inspection. 4. The understanding on the itemized purpose of its inspection is relatively low. 5. The inspection has something to do with the entrance examination and conderned because of the directive score points. 6. The inspection system failed to show a fairness and a lot of contradictions have been pointed out in the course of its execution. 7. In a comparison of advancing to higher education and nonadvanoing to higher education, the latter has not considered a special necessity. 8. The relative importance for the entrance examination by current inspection of P.S. has shown as fitted one. 9. It is not well comed to practice only in the training of P.S.C. at the assigned time to P.S. From the above conclusion, the following suggestions are required. 1. It is required that the system of P.S.C. is to be equally alotted to the all physical curriculum so that the guidance with the possitive plans be undertaken in the ordinal time. 2. It should not be limited of the system of P.S.C. in reflecting to the result of entrance examination for the boys of advancing to higher educations, and but considered in the dimension of national aspects, and the systematic backing policy enabling to exercise with a interest to the system of P.S.C even for the group of non-advancing for higher education be necessary. 3. A objectivity making the inspection thorough and correct in the course of execution, of the system of P.S.C. is required. 4. The fairness of inspection should be maintained by a sufficient training in advance for the staffs of the physical strength inspection and the inconsistencies should be developed. 5. The items of sport(Swiming, physical exercise, shooting etc.) beside the items of current P.S. inspection is recommended to be added. In the end, by strengthening the grade of current P.S. inspection, it is necessary to let people know that it Is very hard to get a special grade without a consistent effort in ordinary day.
윤문철,조현덕,김성근,김영국,조희근 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.4
In this study, the static and dynamic characteristics of turning process was modelled and the analytic realization of regen-erative chatter mechanism was discussed. In this regard, we have discussed on the comparative assessment of recursive time series modeling algorithms that can represent the machining process and detect the abnormal machining behaviors in precision turning operation. In this study, simulation and experimental work were performed to show the malfunction behaviors. For this purpose, new Recursive Extended Instrument Variable Method(REIVM) was adopted for the on-line system identification and monitoring of machining process. Also, we can apply REIVM algorithm in real process for the detection of chatter frequency and dynamic property and analyze the stability lobe of the system by changing a parameter of cutting dynamics in regenerative chatter mechanics, if it is stable or unstable. Also, The stability lobe of chatter was analysed.