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해수유동 수치모의를 활용한 조류에너지 잠재량 산정 연구
조철희(Chulhee Jo),이강희(Kanghee Lee),조봉근(Bongkun Cho),황수진(Sujin Hwang) 한국신재생에너지학회 2016 신재생에너지 Vol.12 No.S2
This paper describes the methodology and results of a tidal current resource assessment in Korea based on the mean surface velocities from tidal current observations and numerical simulations. The tidal current observation data from 1,938 measuring points was provided by the KHOA (Korea Hydrographic and Oceanographic Agency). A numerical simulation of ocean flow circulation in Korea was conducted to explore the detailed distribution of tidal currents in Incheon-Gyeonggi and Jeollanam-do where there are very high tidal energy potentials and suitable sites for tidal energy farm development. The theoretical tidal current potential was calculated using the API (Averaged Power Intercepted) method which is generally applied in wind power potential estimation in Korea. A numerical simulation of the flow circulation through narrow passages between the islands is very important for resource assessment study.
신영섭(Youngseop Shin),홍기용(Keyyong Hong),조철희(Chulhee Cho) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The impact forces of the highly nonlinear waves are one of the important factors in designing the ocean structures. The impact forces are very difficult to analyze numerically and experimentally because they are impulsive in magnitude and occur instantaneously. In this study, the numerical program based on N.S. equations are used to investigate the impact forces of steep waves where the waves are generated by the wave maker in the numerical wave basin. To validate the numerical code, waves of single frequency are generated and compared with the analytic solution. The arbitrary steep waves are generated by the superposition of each waves and the results are compared with experimental ones, and the acceptable agreements are found. The impact forces on vertical cylinder are simulated where the multiblock grid are applied to cover the complex geometries. The simulations are carried out with varying time steps and grid size near the vertical cylinder, but the incoming breaking waves near the vertical cylinder are not suitably formed, and the magnitudes of the forces show very low values. It is thought that the incoming breaking waves should be simulated near the vertical cylinder more accurately and the impact modeling of the duration time should be made to obtain more reasonable results.
Nickel 촉매를 사용한 Neopentyl Arenesulfonates와 Aryl Grignard Reagents의 C-C Cross-Coupling 반응
조철희,박광용 중앙대학교 미래신기술연구소 2001 미래신기술연구소 논문집 Vol.10 No.1
Biphenyl 유도체들은 천연물과 의약품 등에서 많이 발견되고 있는 구조로서 다양한 생물학적 활성을 갖고 있는 것으로 알려져 있다. 본 연구에서는 (dppf)NiCl_2 촉매를 사용하여 여러 가지 neopentyl arensulfonates 를 aryl Grignard 시약과 반응시킴으로써 다양한 biphenyl 유도체들을 우수한 수율로 합성하였다. Biphenyl derivatives, which are often found in natural products and pharmaceuticals, have been known to possess various biological activities. We synthesized a variety of biphenyls in good yields by the reaction of neopentyl arenesulfonate with aryl Grignard reagents in the presence of (dppf)NiCl_2 as a catalyst.