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김성구(Sung Ku Kim) 전남대학교 종교문화연구소 2012 종교문화학보 Vol.9 No.-
The purpose of this article is to interpret scientifically the Buddhist view of reality in order to understand Buddhism with scientific concept and language. For this purpose, we first explain why the concept of Nothingness is important for the establishment of world peace. Nothingness is logically induced from the law of ‘dependent co-arising’ which is the most important concept of Buddhism. and We claim that the law of ‘dependent co-arising’ imply duality of things. Thus Nothingness is associated with tendency of escape from state of emptiness. This means Nothingness imply the duality of emptiness and ‘tendency of escape from state of emptiness’. We compare the duality of Nothingness with the wave-particle duality and the important concepts of quantum theory which is foundation of modern physics. We also discuss the possibility that the Buddhist view of reality can be supported from EPR paradox and Bell's theorem which is the important concept of quantum theory.
비정상 충류화염편 모델을 이용한 비예혼합 난류화염 해석
김성구(Seong Ku Kim),강성모(Sung Mo Kang),서보선(Bo Sun Seo),김용모(Yong Mo KIm) 한국분무공학회 2001 한국액체미립화학회지 Vol.6 No.3
The present study is focused on modeling the transient behavior of the local flame structure which is especially important for slow reaction processes, such as NOx formation in the radiating flame field. The unsteady flamelet model recently developed has been applied to analyze a steady, turbulent jet flame. Numerical results are compared with experimental data and numerical results of the conventional steady flamelet model. The numerical result reveals that the unsteady flamelet model correctly predicts the nonequilibrium effect upsteam and the subsequent decay of the superequilibrium radical concentrations further downstream.
x-cut $LiNbO_3$ 광도파로 제작 및 Ti 두께에 따른 Near-field 특성 변 화
김성구,윤형도,윤대원,한상필,김창민,박계춘,이진,유용택,Kim, Seong-Ku,Yoon, Hyung-Do,Yoon, Dae-Won,Han, Sang-Pill,Kim, Chang-Min,Park, Gye-Chun,Lee, Jin,Yoo, Yong-Taek 한국전기전자재료학회 1998 전기전자재료학회논문지 Vol.11 No.2
The optical near-field patterns, propagation loss and mode sizes of x-cut $Ti:LiNbO_3$ optical waveguide which was fabricated by Ti-diffusion varying with Ti strip thickness in wet oxygen atmosphere were discussed at optical wavelength 1550nm. As Ti thickness increased from $760{\AA}$, the insertion loss of waveguide was decreased. But at Ti thickness $1500{\AA}$, mode sizes are widely broadened. The Ti thickness of below $1100{\AA}$ and above $1500{\AA}$ showed negative effects to propagation loss and fiber coupling. The best Ti thickness for fabricating low propagation loss and good fiber coupling was inferred to be between $1100{\AA}-1500{\AA}$ in our conditions. And for Ti thickness $1150{\AA}$, its propagation loss, horizontal/vertical mode sizes were showed 1.61 dB/cm, $11.9/8.9{\mu}m$ for TM, 0.22 dB/cm, $12.0/9.1{\mu}m$ for TE respectively.
액체추진제 로켓 엔진 연소장치 개발에 있어서의 전산유체역학 응용
조미옥(Miok Joh),김성구(Seong-Ku Kim),한상훈(Sang Hoon Han),최환석(Hwan Seok Choi) 한국항공우주연구원 2014 항공우주기술 Vol.13 No.2
본 연구에서는 액체산소/케로신 추진 로켓 엔진 연소장치의 국내 개발에 있어서의 전산유체역학 응용 사례를 간략히 소개하였다. 추진제 공급부에 대한 다차원 유동 해석을 통해 유동 균일성을 확인하고 및 압력 손실을 예측할 수 있으며, 개념 설계 단계에서 추진제 매니폴드 형상 설계안을 비교/선택할 수 있다. 다분야 연소/냉각 성능 통합 해석을 통해 로켓 엔진 연소기의 연료 막냉각 및 열차폐 코팅 조건 등 연소/냉각 성능 관련 설계 문제 해결에 필요한 주요 정보를 도출할 수 있다. 향후 분사면 근처에서의 추진제 혼합 및 연소 특성을 파악할 수 있는 해석 모델/기법을 개발할 필요가 있다. This study provides a brief introduction to application of the computational fluid dynamics to domestic development of combustion devices for liquid-propellant rocket engines. Multi-dimensional flow analysis can provide information on the flow uniformity and pressure loss inside the propellent manifold, from which the design selection can be performed during the conceptual design phase. Multi-disciplinary performance analysis of the thurst chamber can also provide key information on performance-related design issues such as fuel film cooling and thermal barrier coating conditions. Further efforts should be made to develop numerical models to resolve the mixing and combustion characteristics of LOX/kerosene near the injection face plate.