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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.
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.
시간종속적 하이퍼미디어 시스템을 위한 SGML DTD 의 설계
김호진(Kim Ho Jin),이수진(Lee Soo Jin),최윤철(Choy Yoon Chul) 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.10
Up to the present, numerous standard models have been presented for modeling hypermedia system and these have been used in designing hypermedia systems. However, each of the models and hypermedia systems present a different methods for information representation and storage. This causes a difficulty in document exchange and presentation between different systems. Also, it has many restriction in controlling user interaction and representing time-dependent multimedia objects. In this paper, a time-dependent hypermedia system is modeled. This system can efficiently represent time-dependent multimedia objects and provides time-dependent links between multimedia objects in different information space through user interaction. Also, an SGML DTD(Document Type Definition) for hypermedia system is designed. In designing of DTD, the main focus is scheduling mechanism for synchronization of multimedia objects and description of various node type. Also modular design is applied to facilitate the understanding of the structure and concept of DTD for the users.
매칭 회로와 구형 Stub를 이용한 Flexible T-DMB 안테나 구현에 관한 연구
김호진(Ho-Jin Kim),이선현(Seon-Hyeon Lee),이영훈(Young-Hun Lee),이상석(Sang-Seok Lee) 한국전자파학회 2011 한국전자파학회논문지 Vol.22 No.2
본 논문에서는, Glass 안테나의 특성과 휴대성 및 제작상의 장점이 있는 다이폴 형태의 Flexible T-DMB 안테나를 제안하였다. 차량의 전면 유리 최외각에 위치하는 안테나를 구현하기 위하여 차체의 영향에 따른 안테나의 특성과 안테나의 부착 위치에 따라 달라지는 안테나 특성을 고려하여 급전 선로 사이에 매칭 회로를 추가하여 안테나의 입력 정합 특성을 높였다. 차량의 전면 유리에서의 실험 결과, T-DMB(174~216 ㎒) 대역에서 안테나의 입력 반사 손실은 ?6 ㏈ 이하를 기준으로 모두 만족하였으며, 위치 변화에도 T-DMB 대역을 만족하였다. In this paper, we proposed flexible T-DMB dipole-shaped antenna that has strength of glass antenna and also has portability and ease of production. The input impedance of antenna according to vehicle body-effect was considered in order to install the antenna on the top of the front window. Installation position of on-glass antennas are changeable defends on driver, so we proposed Interdigital capacitor in feeding point to achieve matching characteristic with no position limit. The measurement result showed good return loss characteristic-below ?6 ㏈ in the T-DMB frequency band and maintained fixed resonant frequency.
수장선상 황색종을 동반한 제 III형 과지질단백혈증 환자 1예
김호진 ( Ho-jin Kim ),서정완 ( Jeong-wan Seo ),김태훈 ( Tae-hoon Kim ),최승환 ( Seung-hwan Choi ),김기호 ( Ki-ho Kim ) 대한피부과학회 2018 대한피부과학회지 Vol.56 No.3
Xanthomas are localized lipid deposits within organs that may manifest as papules, plaques, or nodules in skin. They are commonly associated with all types of hyperlipidemia. Xanthoma striatum palmare characterized by xanthomas of the palmar creases is a rare but important diagnostic physical sign of dysbetalipoproteinemia, also known as type III hyperlipoproteinemia. Type III hyperlipoproteinemia is characterized by the early onset of cardiovascular disease and peripheral vascular disease. We describe herein the case of a 51-year-old female patient affected by xanthoma striatum palmare associated with elevated plasma levels of triglycerides and cholesterol and a lipoprotein electrophoresis pattern consistent with type III hyperlipoproteinemia. (Korean J Dermatol 2018;56(3):187∼191)