Hyukjin Choi's scientific contributions

... In Korea, the effects of infragravity waves are known to be less apparent as in some countries that have coasts directly facing oceans. On the east coast of Korea, however, the influence of infragravity waves is not negligible [7][8][9] especially when severe storm waves are prevailing. ...

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On the Separation Period Discriminating Gravity and Infragravity Waves off Gyeongpo Beach, Korea

... (Hong et al., 2007;Park et al., 2014;Kim et al., 2016;Lee et al., 2018;Park et al., 2018;Cho and Kim, 2020 , 2006;Kermanpur et al., 2008;Kuroiwa et al., 2010;Najafi-Jilani et al., 2014;Abbasi et al., 2018;Tajabadi et al., 2018;Ghanbari and Heidarnejad, 2020(1)(3) 여기서, x i 는 데카르트 좌표에서 i = 1, 2는 x, z에 대응하며, u i 는 i 방향의 유속성분(u, w),u i x i -------= Q Du i Dt --------=  1  --- p x i -------+ 2 D ij x j ---------- 2 3 ------ Q x i -------g i u j  j2 + F i  i t -------+  u i  i   x i ----------------=  i Q    i, k =  1  s   i, k +  2  w   i, k +  3  a   i, k  i, k =  1  s   i, k +  2  w   i, k +  3  a   i, k f t ----+ u f x -----+ w f z -----= 0여기서, X = (x  x i ), Z = (z  z k )이며, C l , m 은 다항식의 계수로 격자점 (i, k)와 인접한 격자점에서의 함수 f(x, z)와 함수의 공 간기울기 g(x, z)로부터 결정할 수 있다.(8) ...

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Development of Simplified Immersed Boundary Method for Analysis of Movable Structures

... Many studies have been conducted using different power laws due to the impact of seabed surface roughness, such as the 1/7th power law, 1/10th power law, and logarithm power law (Harrison et al., 2010). Tidal flow characteristics at Uldolmok Strait were investigated by Ko et al. (2017). The tidal current data were measured using an Acoustic Doppler Current Profiler (model: WHWS ADCP 600 kHz). ...

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Energy capture evaluation of tidal current turbines arrays in Uldolmok strait, South Korea

... Stansell et al. (2002) [5] and Mazeika and Draudviliene (2010) [6] investigated wave height variation patterns across observation time intervals using the wave-train analysis approach. Nishi et al. (1997) [7] and Choi et al. (2017) [8] derived wave parameters through a wave-train analysis method employing the zero-crossing technique. However, when employing the wave-train analysis method for wave height estimation, there is a possibility of underestimation compared to the spectrum analysis method, primarily because the observation interval often deviates from successive waveform peak and trough points [9]. ...

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Optimal Smoothing of the Wind–Wave Spectrum Based on the Confidence-Interval Trade-Off

... Therefore, we refer to the data on the waves of Gangneung, which is closest to Mukho. The waves propagated in seven directions of N, NNE, NE, ENE, E, ESE and SE, and the direction with a highest rate of appearance accounted for 22% of the total waves in the NE direction (Jeong et al., 2016). ...

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A CASE STUDY ON HARBOR OSCILLATIONS BY INFRAGRAVITY WAVES