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최학선(Hark-Sun Choi) 한국해양공학회 1995 韓國海洋工學會誌 Vol.9 No.1
This paper presents a survey result on the ocean equipments used for the measurement of ocean environment. Worldwide past investments and future plans for the ocean developments are summerized. Emphasis is put on the domestic needs and cooperation for the development of measurement technology. Major technologies and their problems in the ocean measuring equipments are documented and compared. Considering the importance of sensing and communication in ocean, the applications of sonar, optics and microwave devices are intensively invesitigated and discussed.
崔學仙(Hark-Sun Choi) 한국해양공학회 1992 韓國海洋工學會誌 Vol.6 No.1
There has been an ever-increasing need for man to descend deeper in the ocean, for the sources of food, minerals, oil and etc. One of the major factors limiting the exploitation of subsea has been the materials problem of submersibles, especially the buoyancy material to be neutrally buoyant at great depth.<br/> A new man-made composit material called syntactic foam which consists of hollow microspheres embeded in resin matrix is studied in this paper. This material is compared to the other candidates, and its physical properties are measured and compared using two methods.
최학선(HARK-SUN CHOI),홍석원(SEOK-WON HONG),김진하(JIN-HA KIM),류재문(JAE-MOON LEW) 한국해양공학회 2004 韓國海洋工學會誌 Vol.18 No.4
Pneumatic damping through an orifice-type duct for an OWC-type wave energy device is studied experimentally. Forced oscillation tests are used to measure chamber pressure and velocity of air-flow through an orifice. Pneumatic damping coefficients are deducted from the experimental research, and the influence of frequency, heave amplitude, and orifice size are discussed. Finally, two formulas are proposed for the estimation of non-dimensional pneumatic damping coefficient by regression analysis. The proposed formula proves to be a reliable method for practical application.
김현주(Hyeon-Ju Kim),최학선(Hark-Sun Choi),김선경(Sun-Kyoung Kim) 한국해양공학회 1998 韓國海洋工學會誌 Vol.12 No.1
The purpose of this study is to analyze the amount of available wave power and its characteristics related to the development of a practical system for ocean wave energy conversion in Korean coastal waters. The analysis method of wave power was established through comparison between theory and numerical simulation of deep sea wave by Inverse Fourier Transform with random phase method. Based on the results of comparison, wave power was estimated by use of data set from observed offshore and coastal waves and hindcasted deep sea waves around the Korean peninsula. Annual mean wave power is estimated as about 1.8~7.0 ㎾ for every metre of wave frontage at East sea, 1.5~5.3 ㎾ at South sea and 1.0~4.1 ㎾ at West sea, respectively. Mean wave power along deep sea front of coastal waters of Korea amounts to about 4.7 GW. Regional distribution and seasonal variation of wave power were discussed to develop practical utilization system of wave power of not so high grade of available wave power.
강제동요시 OWC형 파력발전 공기챔버의 공기반력 실험연구
홍석원(SEOK-WON HONG),최학선(HARK-SUN CHOI),류재문(JAE-MOON LEW),김진하(JIN-HA KIM) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.3
The effect of frequency and amplitude of the OWC (Oscillating Water Column) motion on the nonlinear reaction forces in an air duct are studied experimentally. Experimental OWC model is idealized as a simple circular cylinder with an orifice type air duct located at the middle of the top rid. Reaction forces due to forced heave oscillation are measured and analyzed. By subtracting the effect of inertia forces and restoring forces, pneumatic damping force and added spring force are deduced. The effects of the frequency and amplitude of the heave motion are discussed. Also, the effects of solidity of the duct on the reaction forces are discussed.
홍기용(KEYYONG HONG),양찬규(CHAN-KYU YANG),최학선(HARK SUN CHOI) 한국해양공학회 2001 韓國海洋工學會誌 Vol.15 No.3
An experimental method to investigate the dynamic characteristics of buoys in extreme environmental condition is established. Because the buoy model requires a resonable size for accurate experiment, the test condition in model basin that satisfies the similarity law is hardly compatible with capability of test facilities. It is suggested that the linear wave component that is unable to satisfy similarity is separated with others. The model experiment is carried out with mitigated condition for the linear wave components while others including wave drift, current and wind are keeping the similarities. Then, the result can be extrapolated to give the dynamic behavior of buoys in extreme condition because linear wave component is solely responsible to oscillatory buoy motion and other environmental components are applied as a initial tension. The similarity for current and wind conditions is viewed as equivalence of restoring forces. The validity of proposed method is examined with different types of standard ocean buoys and it indicates that the linearity of measured characteristics is assured with a limitation of resonable distance between test and estimated wave conditions.