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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.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.
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.
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.
해저케이블 보호설비의 설계를 위한 환산심해파고 산정기법 개발
강하늘(Haneul Kang),박주웅(Jooung Park),김정훈(Jeonghun Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 연구에서는 해저케이블 보호설비의 설계에 적용하기 위한 환산심해파고 산정기법으로 선형천수 변형계수를 반영하여 개선된 Goda 기법을 제시하였다. 또한, 제시된 기법을 바탕으로 기존의 Goda 기법과 국내 설계 관행 기법의 환산심해파고 계산 결과를 비교한 결과 각각 최대 20%, 40%의 차이를 보였다. 이를 통하여 천해역의 파고를 선형 파랑모델을 사용하여 산정한 경우, 환산심해파고는 선형천수변형을 반영한 Goda 기법을 적용하여 산정해야 할 것으로 판단된다.
강하늘(Haneul Kang),김현지(Hyunji Kim),김광수(Kwangsu Kim),임성훈,허선철(Sunchul Huh) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.7
Recently, as electronic devices and main boards have been miniaturized and increased in performance, the power density of emission has been rapidly increasing. In order to improve the heat dissipation performance of the electronic device, a heat conductive material having excellent internal heat dissipation performance is used. Accordingly, in this study, nickel nano thermal grease was prepared by mixing nickel nano powder used as a heat transfer medium with silicon oil. As a result, it improved by about 190% compared to silicone base oil.
성악가의 음성위생 습관과 한국어판 음성관련 삶의 질(K-VRQOL) 특성
강하늘(Kang, Haneul),김선희(Kim, Seonhee),유재연(Yoo, Jeayeon) 한국음성학회 2018 말소리와 음성과학 Vol.10 No.3
The purpose of this study was to investigate vocal hygiene habits and Korean Voice-Related Quality of Life (K-VRQOL) among classical singers. A total of 128 classical singers filled an online voice and K-VRQOL questionnaire, and the results were analyzed. In order to investigate the characteristics of K-VRQOL according to age groups, and the presence or absence of a history of voice problems, we conducted a two-way ANOVA. The results are as follows. Of the 128 classical singers, 28 (21.9%) with a history of voice problems said that excessive conversation, singing practice, and yelling were the causes of their voice problems. The symptoms of voice problems were fatigue, loss of range, hoarseness, and breathiness. In addition, classical singers were less likely to smoke, or to drink alcohol or caffeine. The K-VRQOL was highly correlated with all sub-domains. There was a statistically significant difference according to age groups (p<.05) and history of voice problems (p<.01). There was no correlation between age groups and history of voice problems. Voice management is important because classical singers can ruin their voice by speaking, and the risk of voice disorder is high. Voice problems affect quality of life. In future studies, it is necessary to obtain information on the subjective voice characteristics of classical singers by examining the relationship between their voice hygiene habits and VHI, SVHI, and K-VRQOL.