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"Green Sea Ranger", an Oil-Spill Model for Korean Coastal Waters
Hong, Key-yong,Song, Mu-seok The Society of Naval Architects of Korea 1997 Journal of ship and ocean technology Vol.1 No.2
We reviewed various oil-spill models and condensed the integrated information into a prediction model, “Green Sea Ranger”which is applicable to Korean coastal area. The developed software consists of pre- and post-modules for environment setup and display of results and main module for the prediction of oil\`s fate. In the pre-module target areas can be selected from the included geographic information system and various environmental and optional numerical data for the prediction can be input through easy GUI or imported from the database we established. For the fate of the spilt oil we included effects of spreading, advection, evaporation, and emulsification. Preliminary numerical experiment has proved that the developed oil-spill prediction system can be easily utilized in on-site oil recovery operations which usually require a quick and reasonable prediction.
홍기용(Hong, Key-Yong),신승호(Shin, Seung-Ho),홍도천(Hong, Do-Chun) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Oscillating wave amplitude in a bottom-mounted owe chamber designed for wave energy converter is investigated by applying characteristic wave conditions in Korean coastal water. The effects of shape parameters of OWC chamber in a view of wave energy absorbing capability are analyzed. Both experimental and numerical approaches are adopted and their results are compared to optimize the shape parameters which can result in a maximum power production under given wave distribution. The experiment was carried out in a wave flume under 2-D assumption of OWC chamber. In numerical scheme, the potential problem inside the chamber is solved by use of the Green integral equation associated with the Rankine Green function, while outer problem with the Kelvin Green function taking account of fluctuating air pressure in the chamber. Air duct diameter, chamber width, and submerged depths of front skirt and back wall of chamber changes the magnitude and peak frequency of wave absorption significantly.
다방향 쇄파 발생 전후의 파랑 성분간 에너지 전이 및 소산
홍기용(KEY-YONG HONG),에스똘히오 메자(EUSTORGIO MEZA) 한국해양공학회 2003 韓國海洋工學會誌 Vol.17 No.6
Wave energy dissipation and energy transfer between wave components, during the directional wave breakings, are investigated. Directional incipient and plunging breakers were generated by focusing the multi-frequency and multi-directional wave components at a designed location, based on a constant wave amplitude and a constant wave steepness frequency spectrum. The time series of surface wave elevation was measured at 9 different locations around the wave focusing point, using a wave gauge array. In order to examine the variation of the directional spreading function, the horizontal velocity of fluid motion was also measured. By comparing energy spectrums, before and after the breaking the characteristics of energy dissipation and energy transfer, caused by wave breaking are investigated. Their dependencies on directionality, as well as frequency, are analyzed. The breakings significantly dissipate wave energy, through energy transfer, in the upper region of the peak-frequency band, while enhancing wave energy in the low-frequency band.
파력발전 적지 선정을 위한 제주 해역 파랑에너지 분포특성 연구
홍기용(KEY-YONG HONG),류황진(HWANG-JIN RYU),신승호(SEUNG-HO SHIN),홍석원(SEOK-WON HONG) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.6
Wave power distribution is investigated to determine the optimal sites for wave power generation at Jeju sea which has the highest wave energy density in the Korean coastal waters. The spatial and seasonal variation of wave power per unit length is calculated in the Jeju sea area based on the monthly mean wave data from 1979 to 2002 which is produced by the SWAN wave model simulation in prior research. The selected favorable locations for wave power generation are compared in terms of magnitude of wave energy density and distribution characteristics of wave parameters. The results suggest that Chagui-Do is the most optimal site for wave power generation in the Jeju sea. The seasonal distribution of wave energy density reveals that the highest wave energy density occurs in the northwest sea in the winter and it is dominated by wind waves, while the second highest one happens at south sea in the summer and it is dominated by a swell sea. The annual average of wave energy density shows that it gradually increases from east to west of the Jeju sea. At Chagui-Do, the energy density of the sea swell sea is relatively uniform while the energy density of the wind waves is variable and strong in the winter.
파랑-조류 상호작용에 의한 Freak Wave 발생기전 수치해석 기초연구
성홍근(Hong Gun Sung),홍기용(Key Yong Hong),홍사영(Sa Young Hong) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
In this paper, generation mechanisms of ocean freak waves are briefly introduced in the context of wave-current interaction phenomena. As an accurate and efficient numerical tool, the spectral method is presented with general features and specific treatment for the wave-current interaction problem. Accuracy and convergence of the developed spectral method is proved to be very promising. Due to the preliminary numerical results for a linear wave-maker problem, the numerical stability of the present method is reliable. It is therefore believed that the present numerical method seems to be very promising for the understanding and analysis of the freak wave generation mechanism due to wave-current interaction.
파랑집중에 의한 다방향 극한파 생성의 효율성에 관한 실험적 연구
홍기용(KEY-YONG HONG),류슈쉐(SHU-XUE LIU),양찬규(CHAN-KYU YANG) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.5
Extreme waves are generated in a model basin based on directional wave focusing. The targeted wave field is described by double summation method and it is applied to serpent-type wavemaker system. The extreme crest amplitude at a designed location is obtained by syncronizing the phases and focusing the directions of wave components. Two distinguished spectrums of constant wave amplitude and constant wave steepness are adapted to describe the frequency distribution of component waves. The surface profile of generated wave packets is measured by wave guage array and the effects of dominant spectral parameters governing extreme wave characteristics are investigated. It is found that frequency bandwidth, center frequency, shape of frequency spectrum and directional range play a significant role in the wave focusing. In particular, the directional effect significantly enhances the wave focusing efficinecy.
스펙트랄요소법(SEM)을 이용한 파랑-조류 상호작용 현상 수치해석 연구
성홍근(Hong Gun Sung),홍기용(Key Yong Hong),경조현(Jo Hyun Kyung),홍사영(Sa Young Hong) 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.3 No.1
본 논문에서는 Freak Wave의 생성원인에 대하여 간략히 논의하였으며, 이 중 파랑-조류 비선형 상호작용에 대한 이론 및 수치적 해석기법의 역사와 장단점 등을 기술한다. 본 연구에서는 파랑-조류 상호작용에 대한 수치모델링 및 해석 기법을 개발하고 있다. 개발 중인 수치해석 기법은 공간적으로 불균일한 조류와 파랑의 비선형 상호작용을 해석하기 위하여 Navier-Stokes 방정식을 이용하여 유동현상을 모델링하였으며, 이산화를 위하여 스펙트랄요소법(Spectral Element Method; SEM)을 이용하였다. 또한 자유표면의 운동을 효과적으로 기술하기 위하여 ALE(Arbitrary Lagrangian-Eulerian)기법을 사용하였다. 본 연구의 유동 모델과 수치해석기법의 과정과 특성, 그리고 장점 등에 대하여 논의하였으며, 초기적인 수치해석 결과를 제시하였다. 이를 바탕으로 개발된 수치해석기법의 정확성 및 수렴성을 확인할 수 있다. In this paper, generation mechanisms of ocean freak waves are briefly introduced in the context of wave-current interaction phenomena. The present model of the fluid motion is based on the Navier-Stokes equations incorporating velocity-pressure formulation because of need to model the nonlinear wave interaction with spatially non-uniform current field. In order to deal with the free surface motion, an Arbitrary Lagrangian-Eulerian (ALE) description is adopted. As on accurate and efficient numerical tool, the spectral element method is presented with general features and specific treatment for the wave-current interaction problem. As an intermediate stage of development, solution procedure and characteristic aspects of the present modeling and numerical method are addressed in detail, and preliminary numerical results prove its accuracy and convergence.
A prototype MR insertable brain PET using tileable GAPD arrays.
Hong, Key Jo,Choi, Yong,Jung, Jin Ho,Kang, Jihoon,Hu, Wei,Lim, Hyun Keong,Huh, Yoonsuk,Kim, Sangsu,Jung, Ji Woong,Kim, Kyu Bom,Song, Myung Sung,Park, Hyun-Wook The American Association of Physicists in Medicine 2013 Medical physics Vol.40 No.4
<P>The aim of this study was to develop a prototype magnetic resonance (MR)-compatible positron emission tomography (PET) that can be inserted into a MR imager and that allows simultaneous PET and MR imaging of the human brain. This paper reports the initial results of the authors' prototype brain PET system operating within a 3-T magnetic resonance imaging (MRI) system using newly developed Geiger-mode avalanche photodiode (GAPD)-based PET detectors, long flexible flat cables, position decoder circuit with high multiplexing ratio, and digital signal processing with field programmable gate array-based analog to digital converter boards.</P>
방사성동위원소 심혈관촬영술을 이용한 우 - 좌단락의 정량화에 관한 연구
홍창의,범희승,이명철,오연상,김병태,임상무,정준기,고창순,이영우,윤용수 대한핵의학회 1986 핵의학 분자영상 Vol.20 No.2
A noninvasive procedure for diagnosis and quantitation of right-to-ieft intracardiac shunts will enhance the management of patients with cyanotic congenital heart disease. This study describes an application of radionuclide (RN) angiocardiography for quantitation of right-to-left shunt amount. Gamma variate modei was fitted to radionuclide data recorded over the carotid artery. Data analysis was performed retrospectively in 35 patients who underwent cardiac catheterization within a week from the day of RN angiocardiography. Thirty one of the patient had right-to-left shunts and 4 of them had left-to-right shunts. Both the radionuclide and Fick measurements correlated well (r=0.93, 0.93, 0.89, p<0.01 in each measurements). Therefore, RN angiocardiography data may be used for accurate calculation of right-to-left shunts in cyanotic congenital heart disease patients.