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투수층에 적용 가능한 흐름함수방식의 확장형 완경사방정식의 개발
김건우,Kim, Gunwoo 해양환경안전학회 2016 海洋環境安全學會誌 Vol.22 No.6
본 연구에서는 유한한 깊이의 투수층에 의한 파랑 감쇠 현상을 흐름함수에 대한 확장형 완경사방정식을 사용하여 해석하였다. 에너지 감쇠율을 흐름함수에 대한 완경사방정식에 고려할 수 있도록 감쇠항을 제시하였다. 수치실험 시 계산영역에서 반사된 파가 경계에서 재반사되는 문제를 극복하기 위해서, 델타함수 형태의 원천함수를 유도하여 계산영역 내에서 조파하였다. 경사면 위의 파랑의 반사율 측정 실험을 다양한 주기에 대해서 수행하였다. 투수성이 있는 수중둔덕에 대해서, 수치실험 결과는 해석해인 적분방정식의 결과와 대체로 잘 일치하였다. 그러나, 투수계수가 크고 파장이 길수록 본 연구의 결과가 상대적으로 높은 투과율을 보였다. In this study, wave damping due to a permeable bed of finite depth was modelled using a complementary mild-slope equation for stream function. The energy dissipating term in the mild-slope equation was presented in terms of stream function. In order to prevent re-reflection of reflected waves along the outer boundary, a delta-function-shaped source function was derived to generate a wave in a computational domain. Numerical experiments were conducted to measure the reflection coefficient of waves over a planar slope for various incident wave periods. The numerical result of the proposed model was compared with that of an integral equation method, showing good agreement in general. However, the proposed model showed relatively higher transmission rate for the larger permeability and the longer wavelength.
한반도 영향태풍 분석을 위한 태풍유형지수 활용 및 사례분석
김건우,정우식,Kim, Gunwoo,Jung, Woo-Sik 한국환경과학회 2021 한국환경과학회지 Vol.30 No.7
This study aimed to classify typhoons using a more objective index based on strong winds and precipitation data from 1904 to 2019 obtained from the Automated Surface Observing System. The Typhoon Type Index (TTI) was calculated by classifying wind speed and precipitation of each typhoon, thereby revealing the rate and characteristics of the wind-type and rain-type typhoons. In addition, the top 10 typhoons for property damage were analyzed by dividing them into three types according to the typhoon course. The analysis showed that typhoons of type 1, heading north to the west coast, were most clearly affected by the wind. In addition, the impact of the wind was reduced and the impact of rain increased in the order of typhoon type 2 that landed on the southern coast and type 6 that affected the Korean Peninsula through China.
오디오 어플리케이션 개발을 위한 MOST NetServices API에 관한 연구
김건우(Gunwoo Kim),박평선(Pyungsun Park),정재일(Jaeil Jung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Recently, the increasing consumer demand for various multimedia applications in vehicle, MOST (Media Oriented Systems Transport) technology has been extensively applied. MOST are optimized for in-vehicle multimedia services. In particular, multimedia stream data transmission such as audio and video in a MOST network technology is a key application areas. In this paper, for the design and implementation of audio stream application, as a first step , the main functions of NetServices API and management procedure of synchronous channels were analyzed in terms of application layer.
PAB Folding 방법에 따른 PAB 전개 성능 연구
김건우(Gunwoo Kim),고민석(Minseok Koh),조병룡(Byoungryong Cho) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Many safety researchers have tried to control airbag deployment shape by changing bag folding pattern and tether location or adjusting tether length. Changing bag folding pattern of above methods has advantages in the aspect that there is no additional cost and it is not affected by airbag shape changes due to design change. Airbag folding patterns have an effect on not only airbag inflation characteristics but also OOP injury performance. In particular, airbag inflation characteristics such as bag internal pressure and airbag deployment shape play an important role in controlling dummy kinematics during vehicle crash and reducing OOP occupant injury.<br/> In this study, passenger airbag deployment performances according to four kinds of folding patters are investigated. Bag internal pressure, airbag burst distance and angle, airbag deployment trajectory, and bag eccentricity were measured to research passenger airbag deployment performance.