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한국전기전자재료학회> 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.)

전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) update

Journal of the Korean Institute of Electrical and Electronic Material Engineers

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수록범위 : 1권1호(1988)~34권6호(2021) |수록논문 수 : 4,586
전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.)
34권6호(2021년 11월) 수록논문
최근 권호 논문
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1제일원리 계산을 활용한 전기화학 촉매 연구

저자 : 김동연 ( Dong Yeon Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 393-400 (8 pages)

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As the recent climate problems are getting worse year after year, the demands for clean energy materials have highly increased in modern society. However, the candidate material classes for clean energy expand rapidly and the outcomes are too complex to be interpreted at laboratory scale (e.g., multicomponent materials). In order to overcome these issues, the firstprinciples calculations are becoming attractive in the field of material science. The calculations can be performed rapidly using virtual environments without physical limitations in a vast candidate pool, and theory can address the origin of activity through the calculations of electronic structure of materials, even if the structure of material is too complex. Therefore, in terms of the latest trends, we report academic progress related to the first-principles calculations for design of efficient electrocatalysts. The basic background for theory and specific research examples are reported together with the perspective on the design of novel materials using first-principles calculations.

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2자성 액추에이터 기반의 소프트 로봇

저자 : 노규령 ( Gyu-Lyeong Nor ) , 최문기 ( Moon Kee Choi )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 401-415 (15 pages)

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Soft robots are promising devices for applications in drug delivery, sensing, and manufacturing. Traditional hard robotics are manufactured with rigid materials and their degrees of motion are constrained by the orientation of the joints. In contrast to rigid counterpart, soft robotics, employing soft and stretchable materials that easily deforms in shape, can realize complex motions (i.e., locomotion, swimming, and grappling) with a simple structure, and easily adapt to dynamic environment. Among them, the magnetic actuators exhibit unique characteristics such as rapid and accurate motion control, biocompatibility, and facile remote controllability, which make them promising candidates for the next-generation soft robots. Especially, the magnetic actuators instantly response to the stimuli, and show no-hysteresis during the recovery process, essential for continuous motion control. Here, we present the state-of-the-art fabrication process of magnetically controllable nano-/micro-composites, magnetically aligning process of the composites, and 1-dimensional/multi-dimensional multimodal motion control for the next-generation soft actuators.

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3COMSOL Multiphysics를 활용한 캔틸레버 형태의 압전 에너지 하베스터 구조 해석 시뮬레이션

저자 : 곽민섭 ( Min Sub Kwak ) , 황건태 ( Geon-tae Hwang )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 416-425 (10 pages)

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In the 4th industrial age, electronic devices are becoming smaller and lighter with a low power consumption to overcome spatial limitation. The piezoelectric energy harvesters can convert mechanical kinetic energy into electric energy; thus, enabling the operation of small electronic devices. Recently, various piezoelectric harvesters have been reported and the electric output from these harvesters could be anticipated by theoretical analysis methods. For example, COMSOL Multiphysics software provides a theoretical simulation of piezoelectric effect with a combination of mechanical and electrical phenomena in the piezoelectric materials. This article introduces a brief modeling of piezoelectric harvester to investigate mechanical stress and electrical output of harvesting devices by the COMSOL Multiphysics software.

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4열경화성 에폭시를 이용한 가스 절연 개폐기용 절연 스페이서의 사출 성형 최적화 시뮬레이션

저자 : 배재성 ( Jaesung Bae ) , 이원창 ( Wonchang Lee ) , 지홍섭 ( Hongsub Jee ) , 홍병유 ( Byungyou Hong ) , 이재형 ( Jaehyeong Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 426-432 (7 pages)

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Injection molding is used in many industrial fields such as home appliances, vehicle parts, and electronic device parts because various resins can be molded, leading to mass production of complex shapes. Generally, the empirical prediction method is used to set the initial processing conditions of injection molding. However, this approach requires a lot of cost and its presented solution is not accurate. In this paper, injection molding was simulated through the MoldflowTM in order to manufacture the spacer for gas insulated switch. Through the simulation, the flow of the resin with respect to the diameter of the inlet was analyzed. It was found that the process was possible at a higher resin temperature as the diameter of the inlet increased. In addition, through thermal analysis during injection of the resin, it was confirmed that a stagnation phenomenon occurred at the insert portion during injection molding, and the temperature of the resin was higher than that of the mold. As in this paper, if the spacer is manufactured by optimizing the injection hole and the temperature of the injection process based on simulation, it is expected that the spacer can be manufactured with high productivity.

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5고출력 슁글드 모듈 제작을 위한 결정질 실리콘 태양전지 분할 셀의 전기적 특성

저자 : 노은빈 ( Eun Bin Noh ) , 배재성 ( Jae Sung Bae ) , 김정훈 ( Jung Hoon Kim ) , 유종현 ( Jong Hyun You ) , 이재형 ( Jaehyeong Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 433-437 (5 pages)

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As the demand for new and renewable energy increases due to the depletion of fossil fuels, solar power generation, a core energy source for new and renewable energy, requires research on solar modules for high output power generation. In this paper, the electrical characteristics of solar cell strip at the edge and in the center of single-crystal silicon having a semi-square shape were analyzed. The cell strip located in the center showed the efficiency increase by 0.26% compared to the cell strip at the edge of the solar cell. A shingled photovoltaic module was manufactured for each cell strip. As a result, the output power of the module using the cell strip located in the center was higher by 0.992%.

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6YBa2Cu3O7-y 초전도 벌크의 중성자 조사 효과

저자 : 이상헌 ( Sang Heon Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 438-441 (4 pages)

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The electrical characteristics of single-crystal composite superconductors produced by a melting process were studied by neutron irradiation. In order to improve the current characteristics of the YBa2Cu3O7-y superconductor, it is necessary to form an effective flux pinning center inside the superconductor. In this study, an increase in flux pinning was attempted through neutron irradiation onto YBa2Cu3O7-y superconductors. The neutron irradiation was performed at 30 MeV for 500 sec, The electrical properties of the superconductors were measured in a magnetic field of 5 Tesla at 50 K using a magnetic properties measurement system (MPMS). After neutron irradiation, the critical current density of the YBa2Cu3O7-y superconductor in a 1 Tesla magnetic field was 1×105 A/㎠. Once neutrons were irradiated at 30 MeV and 10 μA for 500 sec, the critical current density was observed to increase significantly. When neutrons are irradiated to a superconductor, micro-defects are created in the superconductor, and they act as flux pinning centers that hold the magnetic field generated when an electric current flows.

KCI등재

7전기열량소자용 Ag 첨가량에 따른 K(Ta,Nb)O3 세라믹스의 구조적·전기적 특성

저자 : 이민성 ( Min-sung Lee ) , 박병준 ( Byeong-Jun Park ) , 임정은 ( Jeong-Eun Lim ) , 이삼행 ( Sam-haeng Lee ) , 이명규 ( Myung-gyu Lee ) , 박주석 ( Joo-Seok Park ) , 이성갑 ( Sung-gap Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 442-448 (7 pages)

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In this work, the (K1-xAgx)(Ta0.8Nb0.2)O3 (x=0.1-0.4) ceramics were fabricated using mixed-oxide method, and their structural and electrical properties were measured. All specimens represented a pseudo cubic structure with the lattice constant of 0.3989 nm. When 0.4 mol of Ag was added, second phases induced from metallic Ag and K2(Ta,Nb)6O16 phase were observed. Dielectric constant and dielectric loss of K(Ta0.8Nb0.2)O3 specimen doped with 0.3 mol of Ag were 2,737 and 0.446, respectively. The curie temperature was about -5℃, which does not change with Ag addition. The remanent polarization began to decrease sharply around 12~15℃, and the temperature at which the remanent polarization began to decrease as the applied voltage increased shifted to the high temperature side. The electrocaloric effect (ΔT) and electrocaloric efficiency (ΔT/ΔE) of the (K0.7Ag0.3)(Ta0.8Nb0.2)O3 ceramics were 0.01024℃ and 0.01825 KmV-1, respectively.

KCI등재

8고출력 슁글드 태양광 모듈 제작을 위한 스트링 연결에 관한 연구

저자 : 김주휘 ( Juhwi Kim ) , 김정훈 ( Junghoon Kim ) , 정채환 ( Chaehwan Jeong ) , 최원용 ( Wonyoung Choi ) , 이재형 ( Jaehyeong Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 449-453 (5 pages)

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Interest and investment in renewable energy have increased worldwide, highlighting the need for renewable energy. Solar energy was the most promising energy of all renewable energy sources, and it has the highest investment value. Because photovoltaics require a certain amount of area for installation, high density and high output performance are required. Shingled module is a promising technology in that they are featured by higher density and higher output compared to the conventional modules. Shingled technology uses a laser scribing to divide solar cells that are to be bonded with electrically conductive adhesive (ECA) to produce and connect strings, which has a higher output in the same area than the conventional modules. In the process of producing solar modules, metal ribbons are used to interconnect cells, but they are also needed for string connections in shingled solar cells. Accordingly, in this study, we researched the interconnection that best suits the connector that joins the string to the string. The module outputs produced under the conditions of the string interconnection were compared and analyzed.

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9비카드뮴계 InZnP/ZnSe/ZnS 코어쉘 양자점의 발광 특성

저자 : 이영기 ( Young-ki Lee ) , 이민상 ( Min-Sang Lee ) , 이정미 ( Jeong-mi Lee ) , 원대희 ( Dae-Hee Won ) , 김종만 ( Jong-man Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 454-460 (7 pages)

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In this work, we synthesized alloy-core InZnP quantum dots, which are more efficient than single-core InP quantum dots, using a solution process method. The effect of synthesis conditions of alloy core on optical properties was investigated. We also investigated the conditions that make up the gradient shell to minimize defects caused by lattice mismatch between the InZnP core and ZnS is 7.7%. The stable synthesis temperature of the InZnP alloy core was 200℃. Quantum dots consisting of three layered ZnSe gradient shell and single layered ZnS exhibited the best optical property. The properties of quantum dots synthesized in 100 ml and in 2,000 ml flasks were almost equal.

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10열확산 프로세스에 의한 초전도 벌크 합성

저자 : 이상헌 ( Sang Heon Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 34권 6호 발행 연도 : 2021 페이지 : pp. 461-465 (5 pages)

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A diffusion heat treatment process for YBa2Cu3O7-y bulk superconductor in a Gd2O3 powder was attempted. As a result of measuring the critical temperature of the superconducting bulk, there was no change in the superconducting transition temperature as the Gd particles diffused into the YBa2Cu3O7-y lattice, resulting in dense microstructure. As a result of measuring the critical current, the critical current density (Jc) of the superconducting bulk having treated by the Gd thermal diffusion treatment at 0 T increased to 3×104 A/㎠ at 0 T, which was higher than that of the superconducting bulk without thermal diffusion treatment. The surface magnetic force of the superconducting bulk with Gd thermal diffusion treatment was observed at the center of the superconducting bulk with the maximum trapped magnetic force (Hmax) of 1.51 kG. This result means that the Gd thermal diffusion treatment contributes to improving the critical current density Jc of YBa2Cu3O7-y, and it is believed that Gd particles migrating into the superconducting bulk through thermal diffusion either fill the surface pores of YBa2Cu3O7-y superconductors or act as a flux pinning center.

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