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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.
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.
유한요소법을 이용한 type 4 수소저장용기용 고정 장치의 구조적 안전성 분석에 관한 연구
김건우(GUNWOO KIM),김혜원(HYEWON KIM),박한민(HANMIN PARK),이정호(JEONGHO LEE),유수진(SUJIN YOON),이한수(HANSU LEE),김종열(JOUNGLYUL KIM),이석진(SEOKJIN LEE),유계형(GYEHYOUNG YOO),윤영길(YOUNGGIL YOUN),김한상(HANSANG KIM) 한국수소및신에너지학회 2024 한국수소 및 신에너지학회논문집 Vol.35 No.2
The study involves a finite element analysis to evaluate the structural integrity of the neck mount block for a type 4 hydrogen storage vessel, with the aim of enhancing its strength and rigidity. The existing neck mount block consists of a fixed part and a sliding part, each comprising a body block for load support, a screw part for neck boss fixation, and bolts. To analyze the vulnerabilities of the neck mount block under bolt fastening and load conditions relative to vehicle travel directions, a structural analysis process was developed. Comparative analysis between the enhanced design and the existing model was performed, resulting in improved strength and rigidity. The objective is to provide guidance for the current product development and to offer fundamental data for the design and structural analysis of future development projects.