대형 해상크레인의 구조 기본 설계

박찬후(CHAN-HU PARK),김병우(BYUNG-WOO-KIM),하문근(MUN-KEUN HA),전민성(MIN-SUNG CHUN) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.1

This paper describes basic structural design for the large floating crane barge of fixed undulation type. Structural analysis was performed separately after dividing the floating crane into two parts, The crane part was composed of jib boom, back stay and back tower and the barge part supported the crane part. The structural strength for jib boom structural members are in compliance with JIS B 8821 and scantling of all barge structural members are in compliance with the requirement of KR (Korean Register of Shipping) Steel Barges and Rules for Classification of Steel Ships. For the structural analysis of large floating crane, MSC/NASTRAN and MSC/PATRAN software were used.

아동청소년 바우처사업의 효과성 연구 : 12주 기초체력 중심으로

박찬후(Park, Chan-Hu),이영광(Lee, Young-Kwang),김종근(Kim, Jong-Geun) 계명대학교 사회과학연구소 2020 한국사회과학연구 Vol.39 No.1

본연구는 아동청소년 바우처사업의 효과성을 연구하고자 하며, 12주 기초체력을 중심으로 바우처집단과 일반집단을 비교 분석하는 것에 목적을 두었다. 이를 위해 D광역시 S구 소재의 L스포츠바우처사업 센터에서 참여아동청소년을 편의표본추출법을 사용하여 15명의 학생을 추출하였고, 바우처사업에 전혀 참여하지 않은 아동청소년을 별도로 15명의 학생을 추출하여 총 30명의 아동청소년을 비교 분석하였다. 연구의 목적을 달성하기 위하여 바우처집단(n=15), 일반집단(n=15)을 설정한 다음 12주간 바우처프로그램 유무를 통해 각각의 바우처집단과 일반집단을 통하여 집단 간의 차이점을 규명하였다. 이상과 같은 연구방법과 연구모형 검증을 기초로 하여 이 연구에서 도출된 결과는 다음과 같다. 첫째, 근지구력의 경우 바우처집단(-2.751, p<.05), 일반집단(-2.750, p<.05) 모두 사전사후검사에서 유의미한 차이가 나타났다. 둘째, 평형성의 경우 일반집단(-3.372, p<.01)에서만 사전사후검사에서 유의미한 차이가 나타났다. 셋째, 순발력의 경우 바우처집단(-2.746, p<.05)에서만 유의미한 차이가 나타났다. 넷째, 유연성의 경우 일반집단(-3.108, p<.01)에서만 사전사후검사에서 유의미한 차이가 나타났다. 다섯째, 민첩성의 경우 바우처집단(4.658, p<.001)에서만 사전사후검사에서 유의미한 차이가 나타났다. 여섯째, 근력의 경우 바우처집단(-2.574, p<.05), 일반집단(-4.826, p<.001) 모두 사전사후검사에서 유의미한 차이가 나타났다. 이상의 결과를 종합하면 아동청소년 바우처사업의 효과성에서 종합적으로 살펴보았을 때 근지구력, 순발력, 근력영역에서 바우처사업의 효과가 있는 것으로 나타났다. 결론적으로, 현 바우처사업의 프로그램은 아동청소년의 기초체력향상에 큰 도움이 되지 않고 있음을 의미한다. 바우처사업 뿐만 아니라 정부 정책 대다수가 성과 위주의 양적 사업을 권장하고 있다. 이에 대다수의 아동청소년들이 바우처사업에 참여할지는 모르겠으나, 성장기 아동청소년의 실질적인 체력요소에는 정책이 미치지 못하는 점을 헤아려 정책을 운영하길 고대한다. This study aims to study the effectiveness of child and youth voucher projects and to compare and analyze vouchers and general groups with 12-week fundamentals. To this end, 15 students were selected using the Convenience Sample Extraction Act for participating children at the L Sports voucher business center in S-gu, D-City. and 15 students were selected separately for non-participation in voucher projects, and a total of 30 children were compared and analyzed. In order to achieve the purpose of the study, the difference between groups was identified through the presence of the voucher program for 12 weeks after establishing voucher groups (n=15) and general groups (n=15). Based on the above-mentioned methods and verification of the study model, the results obtained from this study are as follows. First, for muscle endurance, the voucher group (-2.751, p<.05), General group (-2.750, p<.05) All pre-post examinations showed significant differences. Second, for equilibrium, general group (-3.372, p<.01) did the pre-post examination show a significant difference. Thirdly, for pure stroke, the voucher group (-2.746, p<.05) showed significant differences. Fourth, for flexibility, general group (-3.108, p<.01) did the pre-post examination show a significant difference. Fifth, for agility, the voucher group (4.658, p<.001) showed significant differences in pre-post examinations. Sixth, for muscle strength, the voucher group (-2.574, p<.05), General group (-4.826, p<.001) All pre-post examinations showed significant differences. When combined with the above results, a comprehensive review of the effectiveness of the voucher business for children and adolescents shows that the voucher business has an effect in the areas of muscle endurance, pureness and muscle strength. In conclusion, the current voucher program is not very helpful for improving the basic fitness of children and adolescents. Not only the voucher project but also the majority of government policies encourage performance-oriented quantitative projects. While it is not clear whether the majority of children will participate in the voucher business, we look forward to running the policy considering that the policy falls short of the actual physical factors of growing children.

하퇴삼두근 발달이 보행의 메카니즘에 미치는 영향

박찬후(Park, Chan-Hu),김종근(Kim, Jong-Geun) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.6

The purpose of this study is to determine how the overall factors of gait are affected by the development of the lower triceps. The subjects of the study were 10 adults in their 20s or older based in D, who had no physical diseases and no musculoskeletal problems, and compared and analyzed pedestrian variables by dividing them into upper and lower groups according to differences in lower limb muscle groups. The results of this study are as follows. First, the correlation between the quality of the lower extremity muscle and the gait mechanism showed no significant difference in other variants of gait, but a significant difference in right foot stride time (p<.05). Second, there was no significant difference in the correlation between muscle strain of the lower extremity and the gait mechanism, which is all related to gait. The above results showed that lower extremity muscle development affects walking in the same way as previous studies, but the results did not show significant differences, resulting in differences from previous studies. This can be inferred as a result of no significant difference in young age in their 20s as there has yet to be a near-decrease and the body is healthy. Muscular tension in the lower extremity muscles is also not associated with gait, and an important part of the gait mechanism is believed to affect muscle mass and other areas, regardless of muscle tension and stiffness. In future studies of gait mechanisms, it is hoped that research will continue to identify the impact of gait according to physical characteristics and explore the diversity of gait training through physical instrumentation.

인장계류식 해양구조물의 동적응답해석(Ⅱ)

구자삼(Ja-Sam Goo),박찬후(Chan-Hu Park),이창호(Chang-Ho Lee) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.1

A numerical procedure is described for predicting the motion and structural responses of tension leg platforms(TLPs) in waves. The developed numerical approach is based on a combination of a three dimensional source distribution method and the dynamic response analysis method, in which the superstructure of TLPs is assumed to be flexible instead of rigid. Restoring forces by hydrostatic pressure on the submerged surface of a TLP have been accurately calculated by excluding the assumption of the slender body theory. The hydrodynamic interactions among TLP members, such as columns and pontoons, and the structural damping are included in the motion and structural analysis. The equations of motion of a whole structure are formulated using element-fixed coordinate systems which have the orgin at the nodes of the each hull element and move parallel to a space-fixed coordinate system.<br/> Numerical results are compared with the experimental and numerical ones, which are obtained in the literature, concerning the motion and structural responses of a TLP in waves. The results of comparison confirmed the validity of the proposed approach.

배드민턴 경기 승패에 따른 혈중 젖산농도 및 스트레스 호르몬 분석

김상수(Kim, Sang-Su),박성빈(Park, Sung-Bin),박영호(Park, Young-Ho),이소정(Lee, So-Jung),김진환(Kim, Jin-Hwan),윤해철(Yoon, Hae-Chul),주석범(Ju, Suk-Bum),황병준(Hwang, Byung-Jun),박찬후(Park, Chan-Hu),윤성덕(Yoon, Sung-Duk) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.5

The following research was conducted in order to compare changes in blood lactate levels and stress hormones, such as cortisol, epinephrine, and norepinephrine, of twenty male university students who belonged to a badminton club and arrived at the following conclusions: 1. The changes in blood lactate levels did not show a significant difference in the subjects before or after a game, or between winning and losing groups. 2. The cortisol levels within the same group also did not show a significant change before or after the game; however, the losing group showed higher cortisol levels, and the winning group showed significantly higher levels of cortisol (p<.05). 3. There was no significant change in epinephrine levels between subjects in the same group; however, the losing group showed slightly lower epinephrine levels before the game and the winning showed slightly higher levels. There was, however, no significant difference between the two groups. 4. The change in norepinephrine levels in the winning group dropped after the game and increased in the losing group. But the change was not statistically significant. In conclusion, this research looked into the blood lactate and stress hormone levels of university badminton club students with less than one year of experience. According to the research, blood cortisol levels of the losing group was significantly higher than that of the winning group. The epinephrine and norepinephrine levels of the winning group"s participants dropped by a statistically insignificant amount after a game. These results are in contrast to existing research results. This can be attributed to anxiety factors before games and achievement factors such as winning. In order to better explain the changes in stress hormone levels due to winning or losing, further psychological and physiological research on various sporting mediums and skill levels need to be conducted.

해저 오염 퇴적층 복원 처리를 위한 BMP 패키지 기술 개발

배준홍(JUN-HONG BAE),하문근(MUN-GEUN HA),어경해(GYUNG-HAE AHO),김승혁(SEUNG-HYUK KIM),박찬후(CHAN-HU PARK),김병우(BYUNG-WOO KIM),구근회(KEUN-HOE KOO),윤철원(CHEOL-WON YOON) 한국해양공학회 2003 韓國海洋工學會誌 Vol.17 No.2

Soil, ground water, and sea bed are exposed to a continuous accumulation of polluted materials, causing serious environmental damage. It has been reported that such pollution causes a massive mortality of fish stock in rivers due to the resuspension of toxic chemicals, occurring during strong wind conditions. Therefore, it becomes apparent that there is an immediate demand for the restoration treatment of polluted river bed (or sea bed) sediment layers.<br/> Pollution levels of major rivers and ports, such as Paldang, Kyungan rivers, and Masan port, are becoming of great public concern, and are posing a serious environmental threat. In particular, the pollution of the Shi-hwa river has become a nation wide issue for the last few years. In spite of such public concern, the pollution levels of such rivers or ports are worsening everyday.<br/> In this study, an environmentally sound engineering package is introduced that helps to restore the polluted river bed or sea bed sediments. This engineering package consists of a suction facility, followed by a series of mechanical, chemical, and biological treatment units. The suction facility is designed to minimize secondary pollution that occurs from the resuspension of toxic materials during suction. The sea bed cleaning engineering package is designed to be installed on the top of a floating barge. Such a combination of environmental plant and shipbuilding technology provides a cost-effective solution, minimizing the cost involved in the transportation between suction and treatment facilities.