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초정밀가공기를 이용한 Zerodur의 연삭 특성에 관한 연구
김주환,김건희,한정열,김석환,원종호 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
We explored a new rough grinding technique on optics materials such as Zerodur. The facility used is a NANOFORM-600 diamond turning machine with a custom grinding module and a range of diamond resin bond wheel. The grinding parameters such as workpiece rotation speed, depth of cut and feed rate were altered while grinding the workpiece surfaces of 20mm in diameter. Surface roughness is measured by Form Talysurf series2. Our target is to define grinding conditions producing the surface roughness better than 0.02μm Ra and the form accuracy of around 0.2μm PV.
췌장암 환자에서 알코올 내장신경 신경파괴블럭 후 발생한 간염
이상은,최석환,김영환,임세훈,이정한,이근무,정순호,최영균,김영재,신치만 인제대학교 2008 仁濟醫學 Vol.29 No.-
Splanchnic neurolytic block(SNB) with alcohol improves the management of pancreatic cancer pain. Adverse effects of alcohol SNB which include regional pain, hypotension, diarrhea, and acute alcohol intoxication are common, but acute hepatitis caused by alcohol neurolytic block is rare. A 63-year-old patient with pancreatic head cancer and liver metastasis had complete pain relief after both retrocrural tansdiscal SNB with 100% alcohol 10 ml. But, 1 day later, liver function test showed a high elevation in the aspartate aminotransferase (AST, 2182 IU/L) and alanine aminotransferase (ALT, 1807 IU/L). The patient had slight jaundice, general weakness, chilling, nausea and vomiting after SNB. Both AST and ALT decreased to 46 and 119 IU/L within 10 days with only supportive therapy. But, 19 days later, the patient died due to pneumonia. Our case illustrates the importance of clinical surveillance especially in patient with hepatic disease after alcohol SNB.
Oxygen Refining of Molten High - Carbon Ferromanganese
HAN, Jeong Whan,You, Byung Don,Park, Kab Yong,Pak, Jong Jin 대한금속재료학회(대한금속학회) 1999 METALS AND MATERIALS International Vol.5 No.4
The effects of the oxygen/argon mixing ratio and temperature on the decarburization behaviour of high-carbon ferromanganese melts were investigated. The decarburization reaction was promoted and the oxidation reaction of manganese diminished by increasing temperature and decreasing the oxygen/argon mixing ratio. However, the carbon content in the melt appeared to increase during blowing at low temperatures and high oxygen/ argon mixing ratios because of faster manganese oxidation. An empirical equation was derived to predict the utilization ratio of oxygen for decarburization. The lower oxygen/argon mixing ratio and higher melt temperature were found to be essential in enhancing the efficiency of decarburization and suppressing the oxidation of manganese in the early stage of oxygen/argon refining of high-carbon ferromanganese melts.
HAN, Jeong Whan,Yoon, U Sok 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.2
A numerical analysis of fluid flow in a mini-mill continuous casting tundish has been carried out. The major concern has been focussed on validating the possibility of the use of an FC (Flow Control) pad under the ladle shroud in the tundish. For this purpose, steady state modeling to find flow patterns and non-steady state approaches calculating residence time distribution (RTD) curves for different tundish configurations have been chosen in the present study. Both calculated flow fields and predictions of tracer dispersion have been compared with the results of water model experiments.
HAN, Jeong Whan,Heo, Seung Hwan,Kim, Ik Bum 대한금속재료학회(대한금속학회) 2000 METALS AND MATERIALS International Vol.6 No.5
In order to investigate high temperature oxidation behavior, isothermal oxidation experiments for Ti-45at.%Al-1.6at.%Mn intermetallics prepared by both reactive sintering and melting were carried out in both oxygen and air environments at temperatures of 900, 1000 and 1100℃. In the oxygen environment, reactive sintered Ti-45at.%Al-1.6at.%Mn was found to have excellent oxidation resistance due to the formation of a continuous A1~0, layer at temperatures up to 1100℃; however, when melted it showed very poor oxidation resistance at and above 1000℃. Weight gains of the melted specimen after 12 hours, especially at the temperature of 1000℃ and 1100℃, were nearly 12 times that of the reactive sintered one. 1n air, the reactive-sintered intermetallics showed a poorer oxidation resistance than did that in the oxygen environment. Especially, the weight gains in air were 6 times larger than the weight gains in oxygen when oxidized at 1100℃ for 12 hours.