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민석기 ( Seok-ki Min ),오태웅 ( Taewoong Oh ),김상현 ( Sang Hyun Kim ),조진경 ( Jinkyung Cho ),정호연 ( Ho-yeon Chung ),박동호 ( Dong-ho Park ),김창선 ( Changsun Kim6 ) 한국운동생리학회(구 한국운동과학회) 2020 운동과학 Vol.29 No.1
PURPOSE: An increase in bone mineral density during adolescence increases resistance to fractures in older age. The Korean Society for Bone and Mineral Research and the Korean Society of Exercise Physiology developed exercise guidelines to increase the peak bone mass (PBM) in adolescents based on evidence through a systematic review of previous research. METHODS: Articles were selected using the systematic method, and the exercise guidelines were established by selecting key questions (KQs) and defining the effects of exercises based on evidence through a literature review for selecting the final exercise method. There were 9 KQs. An online search was conducted on articles published since 2000, and 93 articles were identified. RESULTS: An increase in PBM in adolescence was effective for preventing osteoporosis and fractures in older age. Exercise programs as part of vigorous physical activity (VPA) including resistance and impact exercise at least 5 to 6 months were effective for improving PBM in adolescents. It is recommended that resistance exercise is performed 10 to 12 rep·set<sup>-1</sup> 1-2 set·region<sup>-1</sup> and 3 days·week<sup>-1</sup> using the large muscles. For impact exercises such as jumping, it is recommended that the exercise is performed at least 50 jumps·min<sup>-1</sup>, 10 min·day<sup>-1</sup>, and 2 days·week<sup>-1</sup>. CONCLUSIONS: Exercise guidelines were successfully developed, and they recommend at least 5 to 6 months of VPA, which includes both resistance and impact exercises. With the development of exercise guidelines, the incidence of osteoporosis and fractures in the aging society can be reduced in the future, thus contributing to improved public health.
복강경 충수절제술시 함께 시행된 만성 담낭 병변의 동시절제
이안복(Anbok Lee),이정은(Jung Eun Lee),민석기(Seog Ki Min),염차경(Cha Kyung Yum),이현국(Hyeun-Kuk Lee),박재정(Jae Jung Park) 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.78 No.4
Purpose: Laparoscopic cholecystectomy (LC) for asymptomatic gallbladder disease has been increasing since 1990 due to the development of LC technique. Moreover, it might be considered when someone with asymptomatic gallbladder disease needs emergency operation due to acute abdomen such as acute appendicitis. The aim of this study is to identify the efficacy of concurrent laparoscopic appendectomy with cholecystectomy. Methods: From January 1997 to June 2009, 40 patients underwent laparoscopic appendectomy with cholecystectomy at Ewha Womans University Mokdong Hospital. 40 patients were enrolled in this study. We analyzed, retrospectively, clinical and diagnostic information, time and open conversion rate in operation, length of postoperation hospital stay, and complication rate. Results: The mean age was 44.53±15.34 and male to female ratio was 1 to 1.86. 5% of all patients underwent abdominal surgery and 20% of all patients had associated diseases. Most common associated symptoms and final diagnosis were right lower abdominal pain (72.5%) and simple gallbladder stone (62.5%). Mean operation time was 98.75±33.14 min. and there was no open conversion. Mean length of postoperation hospital stay was 5±2 days. There was one (2.5%) postoperative complication. Conclusion: Combined operation of laparoscopic cholecystectomy during laparoscopic appendectomy can be a good modality for patients with chronic gallbladder disease.
[I.T.S.부문] 유압 브레이크 시스템 모델링 및 실차실험을 통한 모델 검증
민석기(Sukki Min),이경수(Kyongsu Yi) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
In this paper we propose two brake models and present experimental results using a specially equipped test vehicle. Modeling of vehicle dynamics playa crucial role to develop vehicle speed and vehicle-to-vehicle distance control algorithm for stop-and-go cruise control system. Since evaluation of controllers on the test road is very expensive, a good model should make control problems explicit, provide sufficient fidelity for simulation and be simple enough to provide a basis for model based controllers. Hydraulic brake system has a lot of control problems such as nonlinearities, disturbances and uncertainties. In this study, hydraulic brake system is modeled from fundamental principles by assuming incompressible flow and another one represents simple 2nd -order filter from master cylinder to wheel caliper based on experimental results.
민석기 ( S. K. Min ),한호성 ( H. S. Han ),김영우 ( Y. W. Kim ),이선영 ( S. Y. Yi ),유권 ( K. Yu ),이남준 ( N. J. Yi ),김유진 ( E. G. Kim ),최용만 ( Y. M. Choi ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-
〈목적〉 총수 담관 결석의 치료 방법은 내시경적 괄약근 절개를 이용한 결석의 제거나 주된 치료방법이었으나 복강경 수술 방법이 등장하면서 담낭 절제를 포함하여 총수담관 결석을 동시에 치료하는 방법이 대안을 제시되고 있다. 환자의 상황에 따라 이들의 치료 방법이 갖는 장점과 단점을 고려하여 가장 적절한 치료 방법을 적용하는 것이 중요한 것이다, 연구의 목적은 총수 담관 결석의 치료 방법으로 복강경 수술의 적응증과 제한점을 제시하고자 하는 것이다. 〈방법〉
FSO 환경에서의 MIMO 와 SISO 의 outage probability 분석
민석기(Seokki Min),문형주(Hyung-Joo Moon),채찬병(Chan-Byoung Chae) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
본 논문에서는 무선 광통신(Free Space Optics) 환경에서 송수신기의 개수에 따른 outage probability 의 차이를 분석하였다. 송수신단 사이의 거리, 기상환경 그리고 신호종류를 달리하여 시뮬레이션을 진행했으며, 각 환경마다 링크의 outage probability 를 비교하였다. MIMO 무선 광통신이 가지는 이점과 이 이점들이 송수신단 사이의 신호 트래킹에 도움을 주는 이유를 제시하였다.
민석기(Sukki Min),이재관(Jaekwan Lee),김병수(Byoungsoo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The results that has discussed in this paper are related to the development of pre-Crash Safety System that is an application of Advanced Safety Vehicle (ASV) to enhance driving convenience and safety. Pre-Crash Safety System is all active safety system aimed to mainly prevent the occurrence of accident and finally reduce the damage of passenger caused by an avoidable collision. It is researched to predict an avoidable collision by sensor and actuate the motorized seat belt in order to improve initial restraint performance and optimize occupant position in advance of collision. Laser radar sensor is applied to achieve the clearance and relative velocity between front vehicle and subject vehicle. Stopping distance algorithm is used in this project to determine the event of collision warning.
민석기(Seokki Min),이창민(Changmin Lee),채찬병(Chan-Byoung Chae) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문에서는 혈관에 이물질이 쌓여 수축된 분자 통신 채널을 분석하였다. 장애물이 내부에 놓인 원통형의 채널환경을 가정하여 시뮬레이션을 진행했다. 분자의 전파는 중앙지점의 반지름, 장애물의 시작위치 등에 영향 받는 것을 확인할 수 있었으며, 이 결과를 통해 추후 연구에 대한 방향성을 제시하였다.