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유효 구동력 개념을 이용한 고상 비정질화 반응의 예측에 관한 연구
곽준섭(J. S. Kwak),지응준(E. J. Chi),최정동(J. D. Choi),박상욱(S. W. Park),소명기(M. K. So),이성만(S. M. Lee),백홍구(H. K. Baik) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.1
이원계 박막확산쌍에서 열처리 방법에 의한 고상 비정질화 반응의 경향성을 예측하기 위하여 유효 구동력 개념을 제시하였다. 고상 비정질화 반응은 두 원소의 물리적 혼합물과 비정질상간의 최대 자유에너지차로 주어지는 열역학적 구동력(ΔG_(max))과 확산원소의 원자반경에 대한 기지의 유효 침입형자리 반경의 비로 주어지는 구조적 요소(R_(m/d))가 충족될 때 일어나는 빠른 확산에 의하여 발생된다고 고찰하고, 유효 구동력 기준을 이용하여 금속/금속계 뿐만아니라 금속/실리콘 계의 고상반응에 의한 비정질상 생성 경향성을 예측하고 실험결과들과 비교하여 잘 적용됨을 보였다. 또한, 유효 구동력 기준이 금속/실리콘 계에서 비정질상의 임계 성장두께 경향성의 예측에도 잘 적용됨을 보였다. It is proposed that formation and growth of amorphous interlayer through solid state amorphizing reaction can be predicted by the concept of effective driving force. The effective driving force consists of two factors; i) the thermodynamic driving force given by maximum free energy difference between physical mixture of binary elements and amorphous interlayer (ΔG_(max)) and ii) the structural factor given by a ratio between effective radius of interstitial site in host matrix and atomic radius of diffusing species (R_(m/d)). It is shown that the the criterion of effective driving force is successfully applied in the prediction of the formation of amorphous interlayer in metal/silicon systems as well as that of metal/metal systems from the comparison of experimental data. In addition, the concept of effective driving force can be well applied to predict the growth tendency of amorphous interlayer in metal/silicon systems.
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이성만,박용원,이종국,오상준,이홍섭,김창호 인제대학교 1993 仁濟醫學 Vol.14 No.3
600mOsm/kg의 저삼투질 농도를 가진 ioxaglate(Hexabrix 320)의 신독성 여부를 관찰한 결과 탈수 상태에서 2.0 ml/kg 이상을 사용하게 되면 신세뇨관 손상이 야기되는 것을 관찰할 수 있다. This study was aimed at checking whether tri-iodinated compounds with greater solubility and low osmolality, Na or meglumine ioxaglate(Hexabrix 320, Guerbet Lab., France) has nephrotoxicity. Subjects were 21 children admitted to our hospital for the evaluation of their congenital heart diseases. None of them had any evidence of renal dysfunction before the study. They were deviled into 2 groups, one was low-dose group(Hexabrix given, < 2.0ml/kg) and the other one was high-dose group(≥ 2.0ml/kg). Renal function studios including serum creatinine(Scr), fractional excretion of sodium(FENa) and urinary β2-microglobulin excretion(UBME, mg of β2-microglobulin per gm creatinine) were done before and after Hexabrix administration. Statistical analyses were done using paired t-test and Wilcoxon signed rank test. Results were as follows ; 1.There were no significant differences of Scr and FENa between before-and after-Hexabrix study. 2.There were significant differences of UBME before - and after- Hexabrix study. 3.Comparing 2 groups, high-dose and low-dose group, with regard to UBME, there was significant increase of UBM in high-dose group after Hexabrix study but not in low-dose group. 4.Uric acid and/or calcium oxalate crystaluria appeared after Hexabrix administration. In conclusion, we confirmed that Hexabrix 320 could induce renal injury, particularly proximal tubular dysfunction, in recommended dosages for cardiac evaluations and that was dose dependent.
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AISI 5160 스프링강에서 비금속 개재물과 수소의 상호작용에 의한 연구
이기영,이재영,이성만,이종람 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.11
The hydrogen Thermal Analysis experiments have been carried out for the identification of hydrogen trapping character by nonmetallic inclusions in AISI 5160 spring steel. It was found that oxide inclusions including Fe-oxide, Al₂O₃and SiO₂have a strong interaction with hydrogen relative to the other defects such as the cementite-ferrite interfaces and microvoids. Also, the trap activation energies of hydrogen for each inclusion were determined as follows. They are 50.6 kJ/mole and 69.5 kJ/mole for the Fe-oxides like Fe₃O₄, and Fe₂O₃, 86.2 kJ/mole for the Al₂O₃and 112.1 kJ/mole for the SiO₂respectively. The thermal analysis technique could be used to predict the fatigue properties of the steel by identifying the nonmetallic inclusions and determining the amount of them in the steel.
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