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Kang, Haneul,Chun, Insik,Oh, Byungcheol The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.-
Many coastal engineering designs utilize empirical formulas containing the Equivalent Deep-water Wave Height (EDWH), which is normally given a priori. However, no studies have explicitly discussed a method for determining the EDWH and the resulting design wave heights (DEWH) under irregular wave conditions. Unfortunately, it has been the case in many design practices that the EDWH is incorrectly estimated by dividing the Shallow-water Wave Height (SWH) at the structural position with its corresponding shoaling coefficient of regular wave. The present study reexamines the relationship between the Shallow-water Wave Height (SWH) at the structural position and its corresponding EDWH. Then, a new procedure is proposed to facilitate the correct estimation of EDWH. In this procedure, the EDWH and DEWH are determined differently according to the wave propagation model used to estimate the SWH. For this, Goda's original method for nonlinear irregular wave deformation is extended to produce values for linear shoaling. Finally, exemplary calculations are performed to assess the possible errors caused by a misuse of the wave height calculation procedure. The relative errors with respect to the correct values could exceed 20%, potentially leading to a significant under-design of coastal or harbor structures in some cases.
Kang, Haneul,Chun, Insik,Oh, Byungcheol The Society of Naval Architects of Korea 2020 International Journal of Naval Architecture and Oc Vol.12 No.1
Many coastal engineering designs utilize empirical formulas containing the Equivalent Deep-water Wave Height (EDWH), which is normally given a priori. However, no studies have explicitly discussed a method for determining the EDWH and the resulting design wave heights (DEWH) under irregular wave conditions. Unfortunately, it has been the case in many design practices that the EDWH is incorrectly estimated by dividing the Shallow-water Wave Height (SWH) at the structural position with its corresponding shoaling coefficient of regular wave. The present study reexamines the relationship between the Shallow-water Wave Height (SWH) at the structural position and its corresponding EDWH. Then, a new procedure is proposed to facilitate the correct estimation of EDWH. In this procedure, the EDWH and DEWH are determined differently according to the wave propagation model used to estimate the SWH. For this, Goda's original method for nonlinear irregular wave deformation is extended to produce values for linear shoaling. Finally, exemplary calculations are performed to assess the possible errors caused by a misuse of the wave height calculation procedure. The relative errors with respect to the correct values could exceed 20%, potentially leading to a significant under-design of coastal or harbor structures in some cases.
강하늘(Kang, Hanuel),전인식(Chun, Insik),오병철(Oh, Byungcheol) 한국연안방재학회 2017 한국연안방재학회 학술발표대회 논문집 Vol.2017 No.-
최근 침식문제가 심각해지면서 연안관리의 중요성이 부각되고 있다. 본 연구에서는 기존의 개발사업지 중심의 접근방식에서 벗어나 사업지 인근 모래를 총량적으로 관리하기 위한 지역표사관리 체계에 대하여 알아보았으며, 강릉항 표사계에 적용하였다. 강릉항 표사계는 초분 광 자료와 수심 자료, 모래이동한계수심 등을 종합적으로 고려하여 주문진항부터 옥계항까지로 설정하였다. 해안선변형 예측 모델인 GenCade를 이용하여 강릉항 표사계에 대한 표사수 급 분석을 예시하였으며 최종적으로 관련 정보 일체를 열람할 수 있는 GIS기반 프레임을 구축 하였다.
강하늘(Kang, Haneul),전인식(Chun, Insik),오병철(Oh, Byungcheol) 한국연안방재학회 2018 한국연안방재학회 학술발표대회 논문집 Vol.2018 No.1
최근 해안 침식문제는 전 세계적으로 중요한 이슈가 되었으며, 이에 따라 해안선 변형을 모의할 수 있는 수치모델의 정확도 향상이 매우 중요하게 인지되고 있다. 본 연구에서는 가용한 34년의 자료를 이용하여 강릉항 인근 표사계에 대해 전반기 17년의 자료와 최적화 기법을 적용하여 파라미터를 보정하였으며, 후반기 17년의 자료를 이용하여 보정된 모델의 검증을 수행하였다. 그 결과, 최적화가 진행됨에 따라 오차가 감소함을 확인하였고, 최적화 알고리즘의 적용으로 인해 파라미터 보정의 정확도가 크게 향상되었음을 확인하였다.
Uplink MU-based channel access scheme for high-throughput of multiple users
Ku, Eunbi,Chung, Chulho,Kang, Byungcheol,Kim, Jaeseok IET 2017 Electronics letters Vol.53 No.10
<P>A new channel access scheme to improve the throughput in the medium access control layer is proposed to support the high data rate of multiple users. The proposed scheme is based on access point-coordinated multiuser transmission via the adoption of a trigger frame. The total throughput of the proposed scheme is improved by up to 30% compared with the uplink-multiuser channel access scheme based on the request to send/clear to send exchange. Moreover, as the number of stations increases, the degree of improvement in performance increases.</P>