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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.
김호진(Ho-Jin Kim),이선현(Seon-Hyeon Lee),이영훈(Young-Hun Lee),이상석(Sang-Seok Lee) 한국전자파학회 2011 한국전자파학회논문지 Vol.22 No.9
본 논문에서는 Flexible-PCB에 제작된 안테나를 구부렸을 때의 특성 변화를 살펴보았다. Polyimide로 이루어진 Flexible-PCB는 유전율 3.5, 두께 0.125 mm를 가진다. 제안된 안테나는 Bluetooth 대역을 만족하는 기본적인 장방형 루프 안테나와 입력부에 Inverted-L 형태의 스터브를 추가한 안테나이다. 제안된 두 가지 안테나 모델에 대하여 8가지 조건의 bending 변화를 통해 bending 정도에 따른 입력 정합 특성과 방사 형태를 비교하였다. In this paper, we studied characteristics of the bent antenna febricated on Flexible-PCB. Flexible-PCB consisting of a polyimide has dielectric constant 3.5, thickness 0.125 mm. Proposed antennas which operates at Bluetooth band are a rectangular loop antenna and a loop antenna with inverted-L type stub. We compared the input matching and radiation characteristics of the proposed antennas under eight kinds of bending conditions.