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IV 천이금속 탄화물과 bcc Fe간 계면 에너지의 제일원리 연구
정순효,정우상,변지영,Chung Soon-Hyo,Jung Woo-Sang,Byun Ji-Young 한국재료학회 2005 한국재료학회지 Vol.15 No.9
This paper describes an ab Initio study on interface energies, misfit strain energies, and electron structures at coherent interfaces Fe(bcc structure)/MCs(NaCl structure M=Ti, Zr, Hf). The interface energies at relaxed interfaces Fe/TiC, Fe/ZrC and Fe/HfC were 0.263, 0.153 and $0.271 J/m^2$, respectively. It was understood that the dependence of interface energy on the type of carbide was closely related to changes of the binding energies between Fe, M and C atoms before and after formation of the interfaces Fe/MCs with the help of the DLP/NNBB (Discrete Lattice Plane/ Nearest Neighbour Broken Bond) model and data of the electron structures. The misfit strain energies in Fe/TiC, Fe/ZrC and Fe/HfC systems were 0.390, 1.692 and 1.408 eV per 16 atoms(Fe: 8 atoms and MC; 8 atoms). More misfit energy was generated as difference of lattice parameters between the bulk Fe and the bulk MCs increased.
IV족 천이금속 질화물과 bcc Fe간 계면 에너지의 제일원리 연구
정순효,정우상,변지영,Chung, Soon-Hyo,Jung, Woo-Sang,Byun, Ji-Young 한국재료학회 2006 한국재료학회지 Vol.16 No.8
The coherent interface energies and misfit strain energies of Fe/XN (X=Ti, Zr, Hf) systems were calculated by first principles method. The interface energies in Fe/TiN, Fe/ZrN and Fe/HfN systems were 0.343, 0.114, and 0.030 $J/m^2$, respectively. Influence of bond energy was estimated using the discrete lattice plane/nearest neighbor broken bond(DLP/NNBB) model. It was found that the dependence of interface energy on the type of nitride was closely related to changes of the bond energies between Fe, X and N atoms before and after formation of the Fe/XN interfaces. The misfit strain energies in Fe/TiN, Fe/ZrN, and Fe/HfN systems were 0.239, 1.229, and 0.955 eV per 16 atoms(Fe; 8 atoms and XN; 8 atoms). More misfit strain energy was generated as the difference of lattice parameters between the bulk Fe and the bulk XNs increased.
오영주,정순효,Oh Young-joo,Chung Soon-hyo 한국재료학회 2004 한국재료학회지 Vol.14 No.3
A numerical simulation based on the finite element method is used to investigate the effect of a reciprocal paddle on the uniformity of deposition rates at a patterned electrode. The calculated deposition rates agreed well with the measured values. The influences of the paddle velocity, the gap between cathodes and paddles, anode size and the distance between the anode and cathode have been studied. The optimum conditions on the paddle and geometric factors for electrodeposit uniformity could be obtained.
선형 이동 자기장을 사용한 원통형 전자기 펌프의 전자기력에 미치는 코일 모양의 영향
이경우(Kyung-Woo Yi),정순효(Soon-Hyo Chung),오영주(Yung-Ju Oh),조영환(Young-Whan Cho),심재동(Jae-Dong Shim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
A numerical simulation program based on the finite element method is developed for calculating electromagnetic field of the cylindrical electromagnetic pump. The calculated results by the developed program show that Lorentz forces show maximum peak at an optimum length (Lc) of the induction coil. The value of Lc depends on the radius of the molten metal when the skin depth is large. On the other hand, the value of Lc depends on the skin depth when it is small.
액체금속의 표면형상제어를 위한 고주파 유도코일 시스템에 대한 연구
오영주(Young-Joo Oh),강경하(Kyong-Ha Kang),정순효(Soon-Hyo Chung),심재동(Jae-dong Shim) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.6
This study is conducted to develop the high frequency inductor with ferro-yoke for the surface shape control. A 3-Dimensional simulation program based on the finite element method is developed for calculating electromagnetic field of the high frequency inductor. The validity of the program and the capability to control the liquid metal shape are confirmed by comparison between the results from calculation and those from measurement.
Parathion 중독으로 인한 근마비고 오인된 심한 기도폐쇄 : 1례 보고
정순효,정규섭,박정기,박영달 대한마취과학회 1969 Korean Journal of Anesthesiology Vol.2 No.1
A case of parathion poisoning has been reported; in which the symptoms of hypoxia resulted from partial airway obstruction, however this was mistaken for parathion poisoning, and the correct diagnosis was proved by removal of hard blood clot in the bronchial bifurcation. Conclusions were as follows: 1. Adquate administration of PAM and atropine presented impressive response of symptoms. 2. Careful and frequent removal of secretion might be the most important problem especially in this poisoning. 3. Massive administration of antibiotics could prevent pulmonary complications. 4. Pulmonary edema, the most common complication, was not present.
DC Arc로의 유동/열전달 해석 - 플라즈마 영역(1)
정순효,변지영,오영주 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.8
Both fluid flow in the plasma region and heat/momentum transfers from the plasma to the molten steel surface in a DC arc furnace were numerically analyzed by considering the shape change of a molten steel surface due to the high velocity plasma jet. Calculated plasma characteristics and heat and momentum transfers from the plasma to the molten steel were compared and discussed with previous results which had been calculated under the assumption of the flat surface of the molten steel. It was found that the formation of a groove enlarged the current flowing area on the melt surface. Although the heat transferred on the melt surface and current flowing area increased by the groove formation, the shear surface acting on the melt surface decreased. By increasing arc current, the radius and depth of grooves, the joule heat, the radiation loss, the heat and shear force transferred to the melt surface and groove area increased. By increasing arc length, the groove radius increased and the groove depth decreased, respectively. And the joule heat generated, the radiation loss and the heat transferred to the melt surface and the shear force acting on the melt surface decreased. But the heat transferred to the groove area and the shear force acting on the groove area decreased.