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생활 형태에 따른 뇌성마비 아동의 대동작 기능 평가 비교
고영건 ( Young-gun Ko ),오태영 ( Tae-young Oh ) 대한신경치료학회 2010 신경치료 Vol.14 No.1
The purpose of this study was to investigate difference of the gross motor function between cerebral palsy children who lived in sheltered house and those who lived home. Subject and Methods This study was a survey research Design. Participants were 19 children living G sheltered housing and 19 children living Seosan city, Dangjin province, and Yesan province. Data were collected from the 21th of February to the 11th of April, 2005. Data were analyzed by SPSS/WIN program. Results This study showed that there is significant difference of average age between sheltered group and home group. In the Gross Motor Function Measure (GMFM) result, there is significantly difference of item “B”(p<.05) .
초미세 결정립 Cu-3% Ag 합금의 기계적 물성과 전기 전도도
고영건(Y.G. Ko),이철원(C.W. Lee),남궁승(S. Namgung),신동혁(D.H. Shin) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
The paper deals with the mechanical and electrical responses of submicrocrystalline Cu-3% Ag alloy as a function of strain imposed by equal-channel angular pressing. When inducing the effective strain of 12, the initial grain size of~50 μm is evidently reduced within the range of 0.2-0.3 μm in size, having a reasonably equiaxed shape. The results of tension tests at room temperature exhibit that the tensile strength of the present alloy increases with increasing the amount of strain whereas losing electrical conductivity slightly. This phenomenon can be explained based on fine grained structure together with the non-equilibrium state of grain boundaries.
마이크로 아크 산화처리된 마그네슘 합금의 부식특성에 미치는 과망간산칼륨의 영향
고영건 ( Young Gun Ko ),이강민 ( Kang Min Lee ),신기룡 ( Ki Ryong Shin ),신동혁 ( Dong Hyuk Shin ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.8
The effect of potassium permanganate (KMnO4) in an electrolyte on the corrosion performance of magnesium alloy coated by micro-arc oxidation (MAO) has been investigated in this study. For this purpose, MAO coating was carried out on the present sample under AC condition in an alkaline silicate electrolyte with and without KMnO4. Irrespective of the addition of KMnO4, it was found from structural observation that the ceramic coating layers consisted of inner and outer layers. In the sample processed in the electrolyte with KMnO4, the outer layer became dense and even contained a number of Mn2O3 atoms, resulting in high corrosion resistance. Based on the results of a potentiodynamic polarization test, it was confirmed that the coating layer formed in the electrolyte with KMnO4 exhibited better corrosion resistance than that without KMnO4. The high corrosion resistance of the MAO-treated magnesium alloy was explained in relation to the equivalent circuit model.
고영건 ( Young Gun Ko ),이병욱 ( Byung Uk Lee ),신동혁 ( Dong Hyuk Shin ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.4
This work investigated the microstructure and mechanical properties of 6063 Al alloy fabricated by shear-drawing (SD) technique where shear and drawing strains were combined together within a predetermined die. To find the optimum condition for sound deformation, three different dies having different inner angle and diameter of the exit channel were prepared. After single deformation of the present sample, the sound deformation took place without an abrupt failure of the sample if the inner angle would be greater than 135˚ in this study, when the channel diameter of the SD die was reduced from 10 to 9 mm. Microstructural observation showed that the inner angle of 135˚ was found to be more effective than that of 150˚ in terms of the alignment of each grain to the shear direction imposed by SD method. In addition, the yield strength of the SD-deformed sample was twice higher than that of the initial counterpart while loosing ductility in tension.