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항공기 대기자료 시스템의 방빙 소요전력량 산정을 위한 다물리 전산해석
조현승(H. Jo),정호진(H. Jeong),구민아(M. Koo),이혁진(H.J. Lee),이학진(H. Lee),명노신(R.S. Myong) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.4
Aircraft air data systems provide important information necessary for the operation and control of aircraft, such as speed, altitude, and temperature. Air data probes are mainly located in front of aircraft or outside such as nose and wing and are directly affected by icing. Therefore, it is important to design an anti-icing system to prevent icing in the air data probe. Compared to costly icing tests, icing and anti-icing simulations using computational fluid dynamics are very effective. In this study, the most critical icing condition was selected by performing ice accretion simulations for various icing conditions experienced by the aircraft air data system. In addition, the amount of power required for anti-icing was calculated under various icing conditions through multiphysics computational simulation, and the tendency of the amount of power required was analyzed.
Si(5 5 12)-2×1 표면에 벤젠과 피리딘의 결합구조
장상훈(S. H. Jang),오승철(S. Oh),한재량(J. R. Hahn),정호진(H. Jeong),정석민(S. Jeong) 한국진공학회(ASCT) 2006 Applied Science and Convergence Technology Vol.15 No.1
Si(5 5 12)-2×1 표면에 벤젠과 피리딘의 흡착구조를 80 K 온도에서 주사 터널링 현미경과 density functional theory 계산 방법으로 연구했다. 벤젠 분자는 기울어진 butterfly 형태로 Si(5 5 12)-2×1의 D2, D3 유닛에 두 개의 adatom과 강하게 결합된다. 흡착 벤젠 분자에 두개의 C=C 이중 결합이 있으며 탄소와 Si adatom 사이에 di-σ 결합이 있다. 피리딘 분자는 Si-N dative 결합 또는 di-σ 형태로 D2와 D3 유닛의 adatom과 결합을 한다. 질소 원자의 홀전자쌍에 의해 결합된 dative 결합은 수직 형태의 구조를 띠며 di-σ 결합보다 더 안정한 것으로 나타났다. Di-σ 결합은 Si-C2와 Si-C5 또는 Si-N1와 Si-C4으로 형성된다. We investigated the adsorption of benzene and pyridine on Si(5 5 12) -(2x1) at 80 K by using variable-low temperature scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. The benzene molecule most strongly binds to two adatoms on the D3 and D2 units in a tilted butterfly configuration, which consists of di-σ bonds between C atoms and Si adatoms and two C=C double bonds in the benzene molecule. Pyridine molecules interact with adatom(s) on the D2 and D3 units through both Si-N dative bonding and di-σ bonds. The dative bonding through the lone pair electrons of N atom produces a vertical configuration (pyridine-like), which is more stable than di-σ bonds. Di-σ bonds can be formed either through Si-N1 and Si-C4 or Si-C2 and Si-C5.