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항공기 충돌에 대한 사장교의 구조거동 평가: 수치해석적 접근
최근기,이정휘,정철헌,안동우,윤재용,Choi, Keunki,Lee, Jungwhee,Chung, Chul-Hun,An, Dongwoo,Yoon, Jaeyong 한국전산구조공학회 2021 한국전산구조공학회논문집 Vol.34 No.3
장교는 공공성이 매우 높은 사회기반시설물로 운용 중 안전성 확보가 필수적이며, 붕괴 또는 파손 시 신속한 대처가 필요하다. 사장교의 붕괴 또는 파손을 야기시킬 수 있는 원인은 크게 자연재난과 사회재난으로 분류할 수 있다. 이 중 사회재난에 속하는 충돌사고는 차량이 교량 하부구조인 교각에 충돌하는 사고, 항공기의 결함으로 인한 추락사고 등이 있을 것이며, 해상교량의 경우 주탑 하단에서의 선박 충돌사고가 있을 것이다. 본 연구에서는 수치해석적 접근법을 기반으로 항공기 충돌에 대한 사장교의 구조거동을 평가하는 절차를 제안하고, 충돌해석을 수행하여 절차의 타당성을 보였다. 제안된 절차에는 1) 적절한 항공기 충돌 시나리오 설정, 2) 사장교의 복잡한 거동 메커니즘을 고려한 구조 모델링, 3) 충돌해석을 통한 구조거동 평가가 포함된다. 해석 결과, 본 연구에서 설정한 시나리오는 대상 교량에 큰 영향을 미치지 못하는 것으로 나타났지만, 향후 다양한 시나리오를 통한 충돌해석을 수행한다면 교량에 심각한 손상을 일으키는 하중 위치 및 임계 하중 수준을 결정할 수 있을 것으로 판단한다. 본 연구에서 수행한 충돌해석 절차를 바탕으로 사장교에서 발생하는 항공기 충돌에 대한 간접적인 평가가 가능할 것으로 기대된다. Cable-stayed bridges are infrastructure facilities of a highly public nature; therefore, it is essential to ensure operational safety and prompt response in the event of a collapse or damage caused by natural and social disasters. Among social disasters, impact accidents can occur in bridges when a vehicle collides with a pier or when crashes occur due to aircraft defects. In the case of offshore bridges, ship collisions will occur at the bottom of the pylon. In this research, a procedure to evaluate the structural behavior of a cable-stayed bridge for aircraft impact is suggested based on a numerical analysis approach, and the feasibility of the procedure is demonstrated by performing an example assessment. The suggested procedure includes 1) setting up suitable aircraft impact hazard scenarios, 2) structural modeling considering the complex behavior mechanisms of cable-stayed bridges, and 3) structural behavior evaluation of cable-stayed bridges using numerical impact simulation. It was observed that the scenario set in this study did not significantly affect the target bridge. However, if impact analysis is performed through various scenarios in the future, the load position and critical load level to cause serious damage to the bridge could be identified. The scenario-based assessment process employed in this study is expected to facilitate the evaluation of bridge structures under aircraft impact in both existing bridges and future designs.
2019년 세계수영선수권대회 개최에 따른 지역주민인식 조사 연구
서영환(Sea, Young-Hwan),최근기(Choi, Keun-Ki),이경록(Lee, Kyong-Rok),이지은(Lee, Ji-Eun),오정준(Oh, Jeong-Jun),김공(Kim, Kong) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.3
This study, through the viewpoint that Gwangju Citizens had, analyzed regional inhabitant recognition in connection with 2019 World Swimming Championship opening and leaded to the conclusion as followings. As a result of analyzing regional inhabitant recognition in connection with 2019 World Swimming Championship opening, this study found out that it was classified with three types. Typel was analyzed to be ‘pursuit type of positive effect on society and economy’, type2 to be ‘pursuit type of negative effect on society and economy’, and type3 to be ‘pursuit type of two aspect (positive and negative) effect on society’. This study analyzed, centering on the common ground among three types. Conceming on regional inhabitants’ recognitions in connection with 2019 World Swimming Championship opening, this study found out that Gwangju citizens laid an emphasis on the recognition of economy, culture, and circumstance. But, they laid more emphasis on social aspect linked with World Swimming Championship. In common, they laid an emphasis on affirmative factor in the social aspect, but they didn’t recognize socially negative factors so much.
기혼 생활체육 참여자의 성(性) 욕구에 대한 대처행동 요인 분석
김현덕(Kim, Hyun-Duck),최근기(Choi, Keun-Ki),이지은(Lee, Ji-Eun),김공(Kim, Kong) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.2
This study analyzed countermeasure behavior factors against sexual desire through the view of married participants in sports-for-all and leaded to the conclusion as followings. First, this study analyzed countermeasure behavior factors against sexual desire through the view of married participants in sport-for-all and found three types; type1 and type2 was named ′indirect solution and control pursuit type′, and type3 was named ‘expression and control simultaneous-pursuit type′. Second, this study analyzed the difference among respective types. In type1 and type2, there was difference between the descriptions such as ′I dissolve sexual desire by sexual intercourse with spouses or opposite sex friend′ and ′I bring up pets or insects′; in type1 and type3, there was difference between the descriptions such as ′I dissolve sexual desire with liquor or tobacco′ and ′I dissolve sexual desire by sexual intercourse with spouses or opposite sex friend′; in type2 and type3 there was difference between the descriptions such as ′I cultivate my beauty′ and ′I dissolve sexual desire by sexual intercourse with spouses or opposite sex friend′. Third, this study analyzed common grounds among three types. As for sexual desire, married participants in sports-for-all was affirmative in controling countermeasure behaviors, but negative in expressive countermeasure behaviors.
이정기(Lee, Jeong-Gi),최근기(Choi, Keun-Ki),김공(Kim, Kong) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.1
The purpose of this study is to analyze the role of taekwondo as missions through taekwondo missionaries’ opinions. The conclusions of this study were as follows. First, according to the results of analyzing the role of taekwondo as missions through taekwondo missionaries’ opinions, there appeared a total of 3 types, which were named ‘the type of active publicity through diversifying taekwondo missions(I)’,‘the type of settlement through taekwondo missions’, and ‘the type of active publicity through diversifying taekwondo missions(Ⅱ)’. There were similarities in the factors which taekwondo missionaries pursue subjectively according to each type. Second, according to the results of analyzing the differences between types, in the differences between ‘the type of active publicity through diversifying taekwondo missions(I)’ as Type I and ‘the type of settlement through taekwondo missions’ as Type Ⅱ,‘overcoming social status and racial discrimination’ was a typical positive factor, whereas ‘promoting the exchange and amity between countries’ was a typical negative factor. In the differences between ‘the type of active publicity through diversifying taekwondo missions(I)’ as Type I and ‘the type of active publicity through diversifying taekwondo missions(Ⅱ)’ as Type Ⅲ, ‘building the mission network between countries and extending bases’ was a typical positive factor, whereas ‘communicating gospel easily because of being able to gather the general public together’ was a typical negative factor. In the differences between ‘the type of settlement through taekwondo missions’ as Type Ⅱ and ‘the type of active publicity through diversifying taekwondo missions’ (Ⅱ) as Type Ⅲ,‘promoting the exchange and amity between countries’ was a typical positive factor, whereas ‘overcoming social status and racial discrimination’ was a typical negative factor. Third, according to the results of analyzing the common factors between 3 types, positive consensus factors were ‘presenting the model of taekwondo mission professional ministry’ and ‘heightening and publicizing the images of our country and taekwondo’,whereas negative consensus factors were ‘being utilized as the cultural communication means’ and ‘developing churches in diverse countries and regions’.
서영환(Sea, Young-Hwan),최용민(Choi, Yong-Min),조선하(Jo, Sun-Ha),이지은(Lee, Ji-Eun),오정준(Oh, Jeong-Jun),최근기(Choi, Keun-Ki),김공(Kim, Kong) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.4
The purpose of this study is to develop local residents" expectation scale according to holding sports events. The conclusions of this study are as follows. This study classified local residents" expectation scale according to holding sports events into 3 sub-factors, including regional development, resident change, and sports utilization. First, regional development factor was composed of 7 items, including the expectation that the land mark of host regions will occur, the expectation that the economy of host regions will be activated, the expectation that the international exchange of host regions will be promoted, the expectation that economic growth and development will be promoted in host neighboring regions, the expectation that famous sites will occur and will be publicized in host regions, the expectation that host regions will be changed into sports mecca cities, and the expectation that host regions will be established as national main regions. Second, resident change factor was composed of 3 items, including the expectation that host local residents" harmony and integration will be performed, the expectation that host local residents" belonging sens will be inspired, and the expectation that host local residents" self-esteem will be inspired. Third, sports utilization factor was composed of 2 items, including the expectation that physical education-related facilities will be ensured and increased in host regions and the expectation that local residents" leisure and welfare facilities will be provided after holding.