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Deposition of Epitaxial YBCO Films on $LaAlO_3$(100) Substrate by Spray Pyrolysis Method
김호진,주진호,홍석관,이선왕,임선원,이희균,홍계원,Kim Ho-Jin,Joo Jinho,Hong Suk-Kwan,Lee Sun-Wang,Lim Sun-Weon,Lee Hee-Gyoun,Hong Gye-Won The Korean Superconductivity Society 2005 Progress in superconductivity Vol.7 No.1
[ $YBa_{2}Cu_{3}O_y$ ] superconducting films were prepared on $LaAlO_3$(100) single crystal substrate by spray pyrolysis method. The precursor solution was prepared by dissolving nitrate powders in de-ionized water. Both of ultrasonic and concentric nebulizers were used in order to generate fine droplets of precursor solution. C-axis oriented films were obtained at deposition temperature of $750\~850^{\circ}C$ and working pressure of 100 Torr and 500 Torr. In case of ultrasonic nebulizer, films showed rough and porous surface morphology due to formation of enormous droplets, while smooth and dense films were obtained for concentric nebulizer. A transport $J_c$ value of $0.43\;MA/cm^2$ at 77 K and self field was achieved on $LaAlO_3$(100) single crystal substrate.
리튬 2차 전지용 LiCo<sub>1-X</sub>Mg<sub>x</sub>O<sub>2</sub>(x=0.03)의 결정구조, 전기전도도 및 전기화학적 특성
김호진,정우창,정연욱,이준형,김정주,Kim, Ho-Jin,Chung, Uoo-Chang,Jeong, Yeon-Uk,Lee, Joon-Hyung,Kim, Jeong-Joo 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.9
[ $LiCoO_{2}$ ] is the most common cathode electrode materials in Lithium-ion batteries. $LiCo_{0.97}Mg_{0.03}O_2$ was synthesized by the solid-state reaction method. We investigated crystal structures, electrical conductivities and electrochemical properties. The crystal structure of $LiCo_{0.97}Mg_{0.03}O_2$ was analyzed by X-ray powder diffraction and Rietveld refinement. The material showed a single phase of a layered structure with the space group R-3m. The lattice parameter(a, c) of $LiCo_{0.97}Mg_{0.03}O_2$ was larger than that of $LiCoO_2$. The electrical conductivity of sintered samples was measured by the Van der Pauw method. The electrical conductivities of $LiCoO_2$ and $LiCo_{0.97}Mg_{0.03}O_2$ were $2.11{\times}10^{-4}\;S/cm$ and $2.41{\times}10^{-1}\;S/cm$ at room temperature, respectively. On the basis of the Hall effect analysis, the increase in electrical conductivities of $LiCo_{0.97}Mg_{0.03}O_2$ is believed due to the increased carrier concentrations, while the carrier mobility was almost invariant. The electrochemical performance was investigated by coin cell test. $LiCo_{0.97}Mg_{0.03}O_2$ showed improved cycling performance as compared with $LiCoO_2$.
다양한 디바이스를 고려한 직업훈련관리 시스템 설계 및 구현
김호진,김창수,Kim, Ho-Jin,Kim, Chang-Soo 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.4
최근 웹에 접근할 수 있는 다양한 기기들의 출현은 웹 개발 분야에 많은 기술적 변화를 가져왔다. 그러나 아직도 일부 웹 사이트들은 여전히 PC 중심으로 운영되고 있고, 특히 직업훈련관리 시스템은 폐쇄적이고 지원 부족으로 PC만을 타깃으로 한 사용자 웹 인터페이스를 제공하고 있다. 본 논문에서는 직업훈련관리 시스템을 대상으로 다양한 디바이스에서 적용할 수 있는 기술과 메뉴구성으로 훈련생들이 보다 쉽게 접근할 수 있는 적용 기술을 제시하고, 구현된 시스템을 실제 현장에서 적용하여 효율성을 검증하였다. Recently, the emergence of a variety of devices to be able to access web have brought many technological changes in the field of web development. However some web sites are still operating with a focus on computers, especially exclusive and slow developing job training related web sites which utilize a User Interface that targets only PCs. In this paper, we propose the job training management system which has a menu configuration and functions to be applied to a variety of devices, and also an applicable technologies for training students to access more easily. Finally, we evaluated its efficiency by applying the implemented system in the actual field.
냉장고의 선형압축기 구동을 위한 단상 하프브리지 인버터 시스템에서 직류단 불평형 보상에 관한 연구
김호진(Ho-Jin Kim),김형진(Hyeong-Jin Kim),김동윤(Dong-Youn Kim),김장목(Jang-Mok Kim) 전력전자학회 2017 전력전자학회 논문지 Vol.22 No.3
This paper presents the control algorithm of a single-phase AC/DC/AC PWM converter for the linear compressor of a refrigerator. The AC/DC/AC converter consists of a full-bridge PWM converter for the control of the input power factor and a half-bridge PWM inverter for the control of the single-phase linear compressor. At the DC-link of this topology, two capacitors are connected in series. These DC-link voltages must be balanced for safe operation. Thus, a new control method of DC voltage balancing for the half-bridge PWM inverter is proposed. The balancing algorithm uses the Integral-Proportional controller and inserts the DC-offset current at the Proportional-Resonant current controller of the inverter to solve the DC-link unbalanced voltages between the two capacitors. The proposed algorithm can be easily implemented without much computation and additional hardware circuit. The usefulness of the proposed algorithm is verified through several experiments.
아질산칼슘과 탄산나노버블수를 사용한 모르타르의 성능 평가
김호진 ( Kim Ho-jin ),김진성 ( Kim Jin-sung ),최형길 ( Choi Hyeong-gil ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2
This study investigated the performance evaluation of polymer cement mortar for repairing concrete structures using calcium nitrite(Ca(NO<sub>2</sub>)<sub>2</sub>) and CO<sub>2</sub> nano-bubble mixing water to develop section-restoration methods for the repair and reinforcement of cracks. The evaluation items were strength and microstructure analysis at 28 days of age according to the change in the amount of calcium nitrite and the use of CO<sub>2</sub> nano-bubble water. As a result of the experiment, it was confirmed that the performance of polymer cement mortar for repairing concrete structures was improved by the generation of nitrite-based hydration products when calcium nitrite and CO<sub>2</sub> nano-bubble water were used.