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제주마와 제주잡종마의 마학적 차이 : 3. 경주마 자원의 피부 두께
양정진,박용수,양재혁,Jeong Jin Yang,Yong Soo Park,Jae Hyuk Yang 국립한국농수산대학교 교육개발센터 2024 현장농업연구지 = Journal of practical agricultural resear Vol.25 No.4
Little research has been done on investigating the specific characteristics of Jeju Ponies (Korean native horse) and Jeju Pony crossbreds. The authors performed evaluation of skin thickness of the skin of these breeds (n=205) at Jeju Race Park as a way of find of hippological difference. Results of this study showed that the Jeju Pony's skin were thicker than the Jeju Pony crossbred. The male's skin were thicker than the female's skin in two breeds respectively. Especially, in the Jeju Pony show significant differences (P < 0.05). In Jeju Pony crossbreds, as the skin thickness were thinner with age increase. 2-year-old group's skin significantly thinner than 3 and over 4-year-old groups. However, the Jeju Pony's skin were not significantly different by age. In conclusion, the authors thought that causes of the difference of the breeds were origin and genetic differences among the horse and the pony. Furthermore, the modified umbilical herniorrhaphy with rubber rings must be used cautiously in the Jeju Pony. It should be taken into account the animals' skin thickness when the leather goods created by using their skin.
펄스 전착법을 이용한 전기분해용 망간 산화물 전극의 제조 및 특성
양정진,이미영,김정식,신현수,박수길,Yang, Jeong-Jin,Lee, Mi-Young,Kim, Jeong-Sik,Shin, Hyun-Soo,Park, Soo-Gil 한국전기화학회 2010 한국전기화학회지 Vol.13 No.2
망간 산화물이 전착된 전기분해용 전극의 전기화학적 특성을 조사하기 위해 펄스 전위차 방법을 이용하여 티타늄 망 표면에 망간 산화물을 전착하였다. 전착된 망간 산화물을 확인하기 위해 EDX 분석과 SEM 분석을 실시하였다. 또한 제조된 전극의 EIS 측정을 실시하여 전기화학적 특성을 관찰하였다. 티타늄 망에 펄스 1cycle의 인가 시간이 증가함에 따라 티타늄 망 표면에 형성되는 망간 입자 크기는 증가 하였으며, 10 ms의 펄스 인가 시간에서 응집이 발생하여 약 100 nm 크기의 망간 산화물 불균일 상이 형성되는 것을 SEM으로 관찰하였다. 다양한 조건으로 제조한 전극들은 EIS 측정을 통해 과전위 부근에서 나타나는 전자이동저항($R_{ct}$, Charge transfer resistance)을 평가하였고, Tafel plot을 이용하여 제조된 전극이 갖는 과전위를 계산하여 전기분해용 전극으로서의 가능성을 모색하였다. In order to investigate the electrochemical propertied of titanium electrode for electrolysis, manganese oxide was electrodeposited on surface of mesh titanium by pulse voltammetry. The morphological changes and impedance results of manganese oxide electrodeposited electrode were analyzed by SEM and EDX. The size of electrodeposited manganese oxide on mesh titanium was increased with first cycle pulse time increase, and approximately 100 non-uniform manganese oxide was grown at 10 ms pulse polarization time. Charge transfer resistance($R_{ct}$) of near the overpotential was analyzed by EIS measurement and the feasibility of prepared electrode was evaluated by the overpotential calculated from Tafel plots.
전기이중층 커패시터용 질소성 작용기를 이용한 개질 활성탄의 전기화학적 특성
양정진,최영주,김한주,육영재,박수길,Yang, Jeong-Jin,Choi, Young-Joo,Kim, Han-Joo,Yuk, Young-Jae,Park, Soo-Gil 한국전기화학회 2013 한국전기화학회지 Vol.16 No.2
전기이중층 커패시터용 활성탄의 정전 용량 향상을 위해 우레아를 이용해 활성탄 표면에 펩티드 결합을 유도하였다. 우레아 도입에 따른 활성탄은 소성과정을 거쳐 안정화되었으며, 전기화학적 특성을 순환전류 전압법을 이용하여 정전 용량을 관찰하고, 임피던스를 통해 저항 변화를 관찰하였으며, 충방전 평가를 통해 싸이클 성능을 관찰하였다. 결과적으로 질소성 작용기의 도입으로 정전 용량은 기존 탄소재에 비해 약 22.9%의 향상을 이루었으며, 저항 감소 및 우수한 싸이클 성능을 나타냄을 확인하였다. In order to improve capacitance of activated carbon for electric double layer capacitors, peptide bond was induced on the surface of the activated carbon by urea. Urea induced activated carbon has been stabilized through carbonization. Electrochemical characteristics was observed by cyclic voltammetry for specific capacitance, electrochemical impedance spectroscope for measuring resistance and charge-discharge for testing the cyclic ability. In the result, specific capacitance is increased about 22.9% than the activated carbon. And it shows excellent cycle performance and decreasing resistance with the introduction of nitrogen functional groups.
양정진,박수길,최종환,김한주,Masayuki Morita 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
The recent developments in lithium ion secondary batteries (LIBs) have been achieved by using selected carbon materials as the anode. Mesophase carbon microbead (MCMB) anode materials have stable Li intercalation and de-intercalation characteristics, making them a good anode material for use in LIBs. However, batteries with pure MCMB anodes are known to have a low power density. Multiwalled carbon nanotubes (MWNTs) are one of the most promising materials for improving a range of electrochemical energy conversion and storage devices because of their unique physical properties, including high electrical conductivity and superior chemical and mechanical stability. Therefore, in this study, MWNTs were deposited on the surface of MCMB anodes to improve their electrical conductivity. The anode materials were separately functionalized using carboxylic acid and amine groups to form MWNT-COOH and MCMB-NH2, respectively, providing them with surfaces of opposite charge. The surface morphology was assessed using scanning electron microscopy, and the electrochemical characteristics were analyzed by cyclic voltammetry and AC impedance measurements in a coin cell. The AC impedance and cyclic voltammetry measurements indicated that MCMBs with MWNTs deposited on their surfaces are promising electrode materials, providing high power density for LIBs.
교류전해에칭용 에틸렌글리콜의 알루미늄박판의 부식억제 효과
박성민, 양정진, 김홍일, 김한주, 김성한, 신진식, 박수길 충북대학교 건설기술연구소 2008 충북대학교 건설기술연구소 논문집 Vol.27 No.1
In this study, additions of aluminium foil eching characteristics were compared with sulfuric acid for capacitor. sulfuric acid and ethylene glycol is used as addition, characteristics of funtional group from addition were guessed by comparing of aluminium foil eching characteristics. When sulfuric acid was added in HCI etching solution, corrosion of aluminum metal was inhibited by the chemical adsorption of sulfate ion, when ethylen glycol was added in HCI etching solution, corrosion inhibited by the chemical adsorption of OH^ion.