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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.
Ti 클래드 강판 제조를 위한 저항 seam 접합 공정의 열전달 수치 해석
정순효,도정만,변지영 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.2
The electrical and thermal fields during a resistance seam welding process for the production of titanium-clad steel plates were numerically analyzed using a finite volume method. Effect of welding parameters such as welding speed, electric current, heating/cooling period, electrode/plate contact area, water cooling intensity, and thermal conductivity of electrode, on temperatures at the bonding layer and titanium surface were studied. With the increase of the water cooling intensity, welding speed, electrode/plate contact area, and thermal conductivity of electrode, temperatures at the bonding layer and titanium surface decreased, but they increased with increasing the heating/cooling period and electric current. Strong cooling, low welding speed, and the use of high thermal-conductivity electrodes were advantageous in preventing oxidation of titanium surface.
Hyaluronidase, Dimethylsulfoxide, Actovegin이 白鼠 皮膚瓣 生存에 미치는 效果에 대한 實驗的 硏究
柳在萬,鄭淳孝 한양대학교 의과대학 1985 한양의대 학술지 Vol.5 No.1
Delay procedure has been used in reconstructive surgery for the prevention of flap necrosis and the augmentation of flap survival. Concerning the delay mechanism, numerous experiments have suggested various hypotheses. Recently, Finseth proposed a new vasodilatation hypotheses, based on the prolonged vascular smooth muscle relaxation in thepprecapillary arterioled to which several factors contribute such as sympathectomy, tissue ischemia and inflammatory reaction. Since then many authors attempted to improve flap survival with pharmacological treatment. The study was conducted to reveal the effect of hyaluronidase, Actovegin and dimethyl sulfoxide on the survival of the random pattern flap in experimental rats. The results were summarized as follows. 1. The mean length of the flap survival was 4.4Cm for the control and 6.7Cm for the flap treated with Dimethylsufoxide. 2. There was no significant difference between the DMSO-treated, Hyaluronidase treated and Actovegin treated animals.