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손종인,이학용,손현승,서태일,윤길상 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
Micro end-milling has been becoming an important machining process to manufacture a number of small products such as micro-devices, bio-chips, micro-patterns and so on. Despite the importance of micro end-milling, many related researches have given grand efforts to micro end-milling phenomenon, for example, micro end-milling mechanism, cutting force modeling and machinability. This paper strongly concerned actual problem, micro tool deflection, which causes excessive machining errors on the workpiece. To research this problem, we measured cutting forces in micro end-milling processes. And then we measured about cutting profile for that processes. At last we make a comparison between tool deflection due to cutting force and measurement of cutting profile.
The Effects of Monetary Policy on Individual Welfares
Sung Jin Kang,Yong Woon Chung,Sang Hak Sohn 한국경제연구학회 2013 Korea and the World Economy Vol.14 No.1
Monetary policy affects heterogeneously the individual welfare even though its main goals such as income growth and economic stability are well accomplished. This is because macroeconomic policy has different impact on individuals according to their income and other characteristics. Accordingly, monetary policy changes the status of income distribution and poverty. By using Panel System GMM estimation for household and province-level data of Korea from 1997 to 2007, this study investigates short and long-term effects of monetary policy on income distribution as well as poverty. The estimation results are as follows. First, real interest rate and poverty are positively correlated while real interest rate does not have significant effects on income distribution. Second, income growth reduces poverty and improves income distribution. Third, inflation reduces poverty while inflation improves income distribution in the short-term but has no significant effects on income distribution in the long-term. Fourth, long-term effects of monetary policy on poverty gap are greater than short-term effects by 60%. And long-term effects of monetary policy on poverty severity are larger than short-term effects by 53%. But for the Gini coefficient, effects of monetary policy do not last long because the coefficient’s auto-correlation term is not significant.
Combination of Vitamin C and Rutin on Neuropathy and Lung Damage of Diabetes Mellitus Rats
Sohn, Uy-Dong,Je, Hyun-Dong,Shin, Chang-Yell,Park, Sun-Young,Yim, Sung-Hyuk,Kum, Chan,Huh, In-Hoi,Kim, Jin -Hak The Pharmaceutical Society of Korea 2002 Archives of Pharmacal Research Vol.25 No.2
We investigated the role of vitamin C or rutin on neuropathy and lung damage of diabetic mellitus(DM) rats. Norepinephrine content was significantly decreased in sciatic nerves of DM rats compared with non-DM controls but vitamin C had no effect on decreases of norepinephrine. 2,4-dinitrophenylhydrazine (DNPH) incorporation, which is biomarker of protein oxidation, was increased in sciatic nerve of DM rats as compared with normal control. However, vitamin C had no effects on increases of DNPH incorporation . We measured the content of conjugated dienes (CD) as a biomarker of lipid oxidation in sciatic nerve. CD was increased in DM as compared with normal control, Vitamin C or rutin had no effects on increases of CD. However, Rutin plus vitamin C significantly decreased the content of CD as compared with CIM rats. In lung of DM rats, DNPH incorporation or CD was increased as compared with normal control. Vitamin C or Rutin had no effects on increases of CD However, Rutin plus vitamin C significantly decreased the content of DNPH incorporation or CD in lung tissue. Vitamin C caused marked pathological changes such as the increases of parenchyma and the thickening of alveolar septa in the lung of DM. Rutin had protective effects on the pathological changes in the lung of DM rats. In conclusion, Vitamin C had no effects on oxidative parameter, such as DNPH incorporation or CD, and on the decreases of norepinephrine content in DM rats. Vitamin C caused the marked pathological changes in the lung of DM rats but rutin had protective efforts against the pathological changes.
Enzyme Activities and Compounds Related to Self-Defense in UV-Challenged Leaves of Rice
Hak-Yoon Kim,Dong-Hyun Shin,Dae-Seung Sohn,In-Jung Lee,Kil-Ung Kim,Sang-Chul Lee,Hyung-Jin Jeong,Moon-Soo Cho 韓國作物學會 2001 Korean journal of crop science Vol.46 No.1
The induction of enzymes and the accumulation of their end products associated with self-defense mechanism in rice were investigated. When rice leaves were irradiated with UV light, activities of diterpene cyclase, phenylalanine ammonia-lyase (PAL), and cinnamic acid 4-hydroxylase (CA4H) were induced and rice phytoalexin, momilactone A was accumulated. The content of p-coumaric acid in rice leaves was closely correlated with self-defense or allelopathic potential against barnyardgrass. UV-challenged rice leaves gave rise to the inhibition of barnyardgrass growth