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김동진,김태형,김병민,최재찬,Kim, D.J,Kim, T.H,Kim, B.M,Choi, J.C 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.5
In practice, the design of forging processes is performed based on an experience-oriented technology, that is designer's experience and expensive trial and errors. Using the finite element simulation and the artificial neural network, we propose an optimal die geometry satisfying the design conditions of final product. A three-layer neural network is used and the back propagation algorithm is employed to train the network. An optimal die geometry that satisfied the same between inner extruded rib and outer extruded one is determined by applying the ability of function approximation of neural network. The neural networks may reduce the number of finite element simulation for determine the optimal die geometry of forging products and further they are usefully applied to physical modelling for the forging design.
2가 유로피움으로 활성화된 NaCaPO<sub>4</sub>의 합성과 광 특성
김동진,박인용,이종원,김규진,김병규,Kim, Dong-Jin,Park, In-Yong,Lee, Jong-Won,Kim, Kyu-Jin,Kim, Byoung-Gyu 한국재료학회 2006 한국재료학회지 Vol.16 No.10
In this study, divalent europium-activated $NaCaPO_4$ green phosphor powders were prepared by the chemical synthetic method followed by heat treatment in reduced atmosphere, and the crystal structures, morphologies and photoluminescent properties of the powders were investigated by x-ray powder diffraction, scanning electron microscope and spectrometer for the first time. The effects of Ca/P and Na/Ca mole ratios on the final products were also investigated. The influences of input amount change of europium as the activator on the light emission intensity were studied, and the resulting concentration quenching phenomenon was observed. The optimized synthesis conditions obtained in this study were Ca/P mole ratio 1.2, Na/Ca mole ratio 3.0 and 4 mole%Eu. The peak wavelength was 505 nm for all the samples. The result of excitation spectrum measurement indicated that the excitation efficiency was high for the long-wavelength UV region. It was thus concluded that the samples prepared in this study can be successfully applied for the light-emitting devices such as LED excited with long-wavelength UV light sources.
김동진,황성식,김정수,김홍표,Kim, Dong-Jin,Hwang, Seong Sik,Kim, Joung Soo,Kim, Hong Pyo 한국압력기기공학회 2009 한국압력기기공학회 논문집 Vol.5 No.2
Nuclear power plants (NPP) using Alloy 600 (Ni 75wt%, Cr 15wt%, Fe 10wt%) as a heat exchanger tube of the steam generator (SG) have experienced various corrosion problems by ageing such as pitting, intergranular attack (IGA) and stress corrosion cracking (SCC). In spite of much effort to reduce the material degradations, SCC is still one of important problems to overcome. Especially lead is known to be one of the most deleterious species in the secondary system that cause SCC of the alloy. Even Alloy 690 (Ni 60wt%, Cr 30wt%, Fe 10wt%) as an alternative of Alloy 600 because of outstanding superiority to SCC is also susceptible to leaded environment. An oxide on SG tubing materials such as Alloy 600 and Alloy 690 is formed and modified expanding to complex sludge throughout hideout return (HOR) of various impurities including Pb. Oxide formation and breakdown is requisite for SCC initiation and propagation. Therefore it is expected that an oxide property such as a passivity of an oxide formed on steam generator tubing materials is deeply related to PbSCC and an inhibitor to hinder oxide modification by lead efficiently can be found. In the present work, the SCC susceptibility obtained by using a slow strain rate test (SSRT) in aqueous solutions with and without lead was discussed in view of the oxide property. The oxides formed on Alloy 600 and Alloy 690 in aqueous solutions with and without lead were examined by using a transmission electron microscopy (TEM), an energy dispersive x-ray spectroscopy (EDXS), an x-ray photoelectron spectroscopy (XPS) and an electrochemical impedance spectroscopy (EIS).
속단의 dichloromethane 분획물이 마우스 두개골 세포의 분화에 미치는 영향
김동진,윤정호,정의원,유윤정,김윤철,유형근,김종관,최성호,Kim, Dong-Jin,Yun, Jeong-Ho,Jung, Ui-Won,Yoo, Yun-Jung,Kim, Yun-Chul,You, Hyung-Keun,Kim, Chong-Kwan,Choi, Sung-Ho 대한치주과학회 2004 Journal of Periodontal & Implant Science Vol.34 No.4
The purpose of this study was to evaluate the effects of DFPR on differentiation of mouse calvarial cell in vitro, to examine the possibility for periodontal regeneration. $10{\mu}g/ml$ of DFPR was used as experimental concentration. osteogenic medium only was assigned as control, Experimental 1 was supplemented with 10nM dexamethasone, Experimental 2 with $10{\mu}g/ml$ DFPR and Experimental 3 with l0nM dexamethasone + $10{\mu}g/ml$ DFPR. cellular activity was evaluated by MTT method at 8, 12, 16 days, expression of mRNA of ALP, osteopontin, osteocalcin, collagen type-l was detected by RT-PCR method at 4, 8, 12, 16 days of culture. extent of mineralization was observed by Von Kossa staining at 16 day of culture. The results are as follows 1)Any acceleration of differentiation was not observed at expression of differentiation marker, 2) Decrease in expression of extracelluar matrix and in bone nodule formation was observed The results suggested that DFPR have negative effect on the rate of differentiation on rat calvarial cell, decrease extracelluar matrix formation ,decrease bone nodule formation. Ongoing studies are necessary in order to determine effect of DFPR on periodontal regeneration.
People Inside - 송치용 한국가금수의사회 회장
김동진,Kim, Dong-Jin 대한양계협회 2022 월간 양계 Vol.54 No.9
지난 6월 한국가금수의사회(이하 가금수의사회)는 총회를 열고 9대 회장에 송치용 원장(보람동물병원)을 선출했다. 본고는 송 회장을 만나 가금수의사회 활동 현황과 향후 계획을 들어보았다.