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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

  • : 한국전기전자재료학회
  • : 공학분야  >  전기공학
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  • : 월간
  • : 1226-7945
  • : 2288-3258
  • : 전기전자재료학회지(~1997)→전기전자재료학회논문지

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수록범위 : 1권1호(1988)~30권12호(2017) |수록논문 수 : 4,219
전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.)
30권12호(2017년) 수록논문
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1실란 및 분산제가 Epoxy와 연자성 금속 파우더 복합체의 Packing에 미치는 영향

저자 : 이창현 ( Chang Hyun Lee ) , 신효순 ( Hyo Soon Shin ) , 여동훈 ( Dong Hun Yeo ) , 남산 ( Sah

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 30권 12호 발행 연도 : 2017 페이지 : pp. 751-756 (6 pages)

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A molding-type power inductor is an inductor that uses a hybrid material that is prepared by mixing a ferrite metal powder coated with an insulating layer and an epoxy resin, which is injected into a coil-embedded mold and heated and cured. The fabrication of molding-type inductors requires various techniques such as for coil formation and insertion, improving the magnetic properties of soft magnetic metal powder, coating an insulating film on the magnetic powder surface, and increasing the packing density by well dispersing the powder in the epoxy resin. Among these aspects, researches on additives that can disperse the metal soft magnetic powder having the greatest performance in the epoxy resin with high charge have not been reported yet. In this study, we investigated the effect of silanes, KBM-303 and KBM-403, and a commercial dispersant on the dispersion of metal soft magnetic powders in epoxy resin. The sedimentation height and viscosity were measured, and it was confirmed that the silane KBM-303 was suitable for dispersion. For this silane, the packing density was as high as about 72.49%. Moreover, when 1.2 wt% of dispersant BYK-103 was added, the packing density was about 80.5%.

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The computational fourier-transform moire (CFTM) method has been briefly explained and this method was used to perform strain analysis of a misfit dislocation in a strained Si/Si0.55Ge0.45 layer. An essential advantage of the CFTM method is that it does not require unwrapping, such that errors due to improper unwrapping can be excluded. The analysis results revealed that the Si layer was grown with tensile stress on Si0.55Ge0.45 and lattice constant of the Si layer along the growth direction was 1.9% smaller than that of Si0.55Ge0.45. On the other hand, strain of the misfit dislocation in the strained Si/Si0.55Ge0.45 layer was maximum at the dislocation core due to an extra half-plane and the exx and eyy values were positive and negative, respectively, along the direction of a burgers vector.

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3Cr2O3-MgO-Y2O3 첨가에 따른 뮬라이트 세라믹스의 기계적 성질

저자 : 임진현 ( Jin-hyeon Lim ) , 김시연 ( Shi Yeon Kim ) , 여동훈 ( Dong-hun Yeo ) , 신효순 ( Hyo-

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 30권 12호 발행 연도 : 2017 페이지 : pp. 762-767 (6 pages)

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Mullite (3Al2O3·2SiO2) has emerged as a promising candidate for high-temperature structural materials due to its erosion resistance, chemical and thermal stabilities, relatively low thermal expansion coefficient, excellent thermal shock and creep resistances, and low dielectric constant. However, since the pure mullite sintering temperature is as high as 1,600~1,700℃, there is an increasing need for a sintering additive capable of improving the strength characteristics while lowering the sintering temperature. Herein we have tried to obtain the optimal sintering additive composition by adding MgO, Cr2O3, and Y2O3 to mullite, followed by sintering at 1,325~1,550℃ for 2 h. With additives of 2 wt% of MgO, 2 wt% of Cr2O3, 4 wt% of Y2O3, A density of 3.23 g/cm³ was obtained for the sintered body at 1,350℃ upon using 2 wt% MgO, 2 wt% Cr2O3, and 4 wt% Y2O3 as additives. The three-point flexural strength of that was 275 MPa and the coefficient of thermal expansion (CTE) was 4.15 ppm/℃.

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4PZT 라미네이트 Trapezoidal Piezoelectric Cantilever Generator의 모드(3-1, 3-3)별 에너지 하베스팅 특성 비교

저자 : 이민선 ( Min-seon Lee ) , 김창일 ( Chang-il Kim ) , 윤지선 ( Ji-sun Yun ) , 박운익 ( Woon-ik

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 30권 12호 발행 연도 : 2017 페이지 : pp. 768-775 (8 pages)

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Energy harvesting characteristics of trapezoidal piezoelectric cantilever generator, which has a lead zirconate titanate (PZT) laminate film, were compared by longitudinal (3-3) and transverse (3-1) modes. The PZT laminate film, fabricated by a conventional tape casting process, was cofired with Ag electrode at 850℃ for 2 h. A multi-layered Ag electrode by a planar pattern and an interdigitated pattern was applied to the PZT laminate to implement the 3-3 and 3-1 modes, respectively. The energy harvesting performance of the 3-3 mode trapezoidal piezoelectric cantilever generator was better than that of the 3-1 mode. An extremely high output power density of 26.7 mW/cm3 for the 3-3 mode was obtained at a resonant frequency of 145 Hz under a load resistance of 50 ㏀ and acceleration of 1.3 G, which is ~3-times higher than that for the 3-1 mode. Therefore, the 3-3 mode is considered significantly efficient for application to high-performance piezoelectric cantilever generator.

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5유한요소법에 의한 적층형 세라믹 히터의 전극 패턴 최적화

저자 : 한윤수 ( Yoonsoo Han ) , 김시연 ( Shi Yeon Kim ) , 여동훈 ( Dong-hun Yeo )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 30권 12호 발행 연도 : 2017 페이지 : pp. 776-781 (6 pages)

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In this study, we investigated the effect of electrode pattern design on the thermal shock resistance and temperature uniformity of a ceramic heater. A cordierite substrate with a low thermal expansion coefficient was fabricated by tape casting, and a tungsten electrode was printed and used as a heating element. The temperature distribution of the ceramic heater was calculated by a finite-element method (FEM) by considering various electrode patterns, and the tensile stress distribution due to the thermal stress was calculated. In the electrode pattern with a single-line width, the central part of the ceramic heater was heated to the maximum temperature, and the position of the ceramic heater having a double-line width was changed to the maximum temperature, depending on the position of the minimum line width pattern. The highest tensile stress was found along the edges of the ceramic heater. The temperature gradient at the edge determined the tensile stress intensity. The smallest tensile stress was observed for electrode pattern D, which was expected to be advantageous in resisting thermal shock failures in ceramic heaters.

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6연자성 복합체에서 파우더 크기 분포와 Epoxy Resin에 따른 Packing Density 변화

저자 : 이창현 ( Chang Hyun Lee ) , 오세문 ( Sea Moon Oh ) , 신효순 ( Hyo Soon Shin ) , 여동훈 ( Don

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 30권 12호 발행 연도 : 2017 페이지 : pp. 782-787 (6 pages)

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There is growing interest in power inductors in which metal soft magnetic powder and epoxy resin are combined. In this field, the process technology for increasing the packing density of magnetic particles in an injection molding process is very important. However, little research has been reported in this regard. In order to improve the packing density, we investigated and compared the sedimentation heights of pastes for three types of soft magnetic alloy powders as a function of the mixing ratios and the type of resin used. Experimental results showed that the packing density was the highest (71.74%) when the mixing ratio was 80:16:4 (Sendust:Fe-Si:CIP) according to the particle size using an SE-4125 resin. In addition, the packing density was found to be inversely related to the layer separation distance. As a result, it was confirmed that the dispersion of solid particles in the paste was important for curing; however, the duration of the curing process can greatly affect the packing density of the final composite.

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7플라즈마 용사된 Al2O3-TiO2 코팅의 전기적 특성

저자 : 박상준 ( Sang-jun Park ) , 이성민 ( Sung-min Lee )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 30권 12호 발행 연도 : 2017 페이지 : pp. 788-793 (6 pages)

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Electrical behaviors of plasma-sprayed Al2O3-TiO2 coatings have been investigated in terms of their TiO2 content. On increasing the TiO2 content from 6 to 30 wt%, the DC electrical conductivity increased by several orders of magnitude. From impedance spectroscopy analysis, the total conductivity of the grains and grain boundaries and their respective activation energies were determined without the electrode effects that could impede ionic transfer. An electron transference number was also estimated, ranging between 6.5% and 7.3% for 13 wt% TiO2 and between 0.4% and 0.7% for 30 wt% TiO2 in the coating. Because of the high electronic contribution to the total conductivity, the Al2O3-TiO2 coating could be a new candidate material to obtain superior electrical conductivity as well as corrosion and wear resistances.

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8기판 온도에 따른 ZnO:Ga 박막의 특성

저자 : 김정규 ( Jeong-gyoo Kim ) , 박기철 ( Ki-cheol Park )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 30권 12호 발행 연도 : 2017 페이지 : pp. 794-799 (6 pages)

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Ga-doped ZnO (GZO) films were deposited by an RF magnetron sputtering method on glass substrates using ZnO as a target containing 5 wt% Ga2O3 powder (for Ga doping). The structural, electrical, and optical properties of the GZO thin films were investigated as a function of the substrate temperatures. The deposition rate decreased with increasing substrate temperatures from room temperature to 350℃. The films showed typical orientation with the c-axis vertical to the glass substrates and the grain size increased up to a substrate temperature of 300℃ but decreased beyond 350℃. The resistivity of GZO thin films deposited at the substrate temperature of 300℃ was 7×10-4 Ωcm, and it showed a dependence on the carrier concentration and mobility. The optical transmittances of the films with thickness of 3,000 Å were above 80% in the visible region, regardless of the substrate temperatures.

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9불규칙 패턴 에칭에 의한 표면 형상 제어와 광학적 특성

저자 : 김성수 ( Sung Soo Kim ) , 이정우 ( Jeong Woo Lee ) , 전법주 ( Bup Ju Jeon )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 30권 12호 발행 연도 : 2017 페이지 : pp. 800-805 (6 pages)

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Randomly patterned and wet chemical etching processes were used to treat anti-glare of display cover glasses. The surface and optical properties of grain size and surface morphology controlled by randomly patterned etching and wet chemical solution etching were investigated. The surface morphology and roughness of the etched samples were examined using a spectrophotometer and a portable surface roughness (Ra) measuring instrument, respectively. The gloss caused by reflection from the glass surface was measured at 60° using a gloss meter. The surface of the sample etched by the doctor-blade process was more uniform than that obtained from a screen pattern etching process at gel state etching process of the first step. The surface roughness obtained from the randomly patterned etching process depended greatly on the mesh size, which in turn affected the grain size and pattern formation. The surface morphology and gloss obtained by the etching process in the second step depended primarily on the mesh size of the gel state etching process of the first step. In our experimental range, the gloss increased on decreasing the grain size at a lower mesh size for the first step process and for longer reaction times for the second step process.

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10SnO2 기반의 투명 UV 광 검출기

저자 : 이경남 ( Gyeong-nam Lee ) , 박왕희 ( Wang-hee Park ) , 김준동 ( Joondong Kim )

발행기관 : 한국전기전자재료학회 간행물 : 전기전자재료학회논문지(J. Korean Inst. Electr. Electron. Mater. Eng.) 30권 12호 발행 연도 : 2017 페이지 : pp. 806-811 (6 pages)

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An all-transparent ultraviolet (UV) photodetector was fabricated by structuring p-NiO/n-SnO2/ITO on a glass substrate. SnO2 is an important semiconductor material because of its large bandgap, high electron mobility, high transmittance (as high as 80% in the visible range), and high stability under UV light. For these reasons, SnO2 is suitable for a range of applications that involve UV light. In order to form a highly transparent p-n junction for UV detection, SnO2 was deposited onto a device containing NiO as a high-transparent metal conductive oxide for UV detection. We demonstrated that all-transparent UV photodetectors based on SnO2 could provide a definitive photocurrent density of 4 nA cm-2 at 0 V under UV light (365 nm) and a low saturation current density of 2.02 nA × cm-2. The device under UV light displayed fast photoresponse with times of 31.69 ms (rise-time) and 35.12 ms (fall-time) and a remarkable photoresponse ratio of 69.37. We analyzed the optical and electrical properties of the NiO/SnO2 device. We demonstrated that the excellent properties of SnO2 are valuable in transparent photoelectric device applications, which can suggest various routes for improving the performance of such devices.

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