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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Electrical and Electronic Material Engineers
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Journal DOI :
The Korean Institute of Electrical and Electronic Material Engineers
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Volume & Issues
Volume 28, Issue 12 - Dec 2015
Volume 28, Issue 11 - Nov 2015
Volume 28, Issue 10 - Oct 2015
Volume 28, Issue 9 - Sep 2015
Volume 28, Issue 8 - Aug 2015
Volume 28, Issue 7 - Jul 2015
Volume 28, Issue 6 - Jun 2015
Volume 28, Issue 5 - May 2015
Volume 28, Issue 4 - Apr 2015
Volume 28, Issue 3 - Mar 2015
Volume 28, Issue 2 - Feb 2015
Volume 28, Issue 1 - Jan 2015
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Technology Development Trends of Self-Powered Next Generation Smart Windows
Pyun, Sun Ho ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 753~764
DOI : 10.4313/JKEM.2015.28.12.753
Among several types of energy saving smart window technologies, the leader, the dynamic EC (electrochromic) window one needs integrated PV (photovoltaics), to minimize expensive electrical wiring as well as to obviate the need for external energy. Self-powered smart windows were reviewed according to PV types used. DSSCs (dye sensitized solar cells) were found to be compatible with EC cells, to have several categories of next generation smart windows such as PECCs (photoelectrochromic cells), PVCCs (photovoltachromic cells), EC polymer PECCs. In addition silicon solar cells and third generation solar cells were investigated. They are summarized in a table showing their advantages and disadvantages respectively for a fast comparison. The strategy to expedite the commercialization of these next generation smart windows includes developing retrofit smart window coverings for use on flexible polymer substrates adhered to the inside surface of a window and easily replaced after use for upto 10 years.
State of the Art and Research Trends on Electrode Materials of Thermal Batteries
Kang, Seung-Ho ; Park, Byung-Jun ; Im, Chae-Nam ; Cho, Sung-Baek ; Cheong, Hae-Won ; Yi, Junsin ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 765~770
DOI : 10.4313/JKEM.2015.28.12.765
Thermal batteries are heat-activated primary reserve power sources that use inorganic salt as electrolytes and specially designed to meet extremely long or environmentally severe storage requirements. They are primarily used to deliver high power for relatively short periods in such applications as fuzes, missiles, ordnance and other military applications. In this paper, we describe a general overview and research trends on electrode materials for thermal batteries.
Design and Fabrication of Micro Patterns on Flexible Copper Clad Laminate (FCCL) Using Imprinting Process
Min, Chul Hong ; Kim, Tae Seon ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 771~775
DOI : 10.4313/JKEM.2015.28.12.771
In this paper, we designed and fabricated low cost imprinting process for micro patterning on FCCL (flexible copper clad laminate). Compared to conventional imprinting process, developed fabrication method processing imprint and UV photolithography step simultaneously and it does not require resin etch process and it can also reduce the fabrication cost and processing time. Based on proposed method, patterns with
linewidth are fabricated on
FCCL. Compared to conventional methods using LDI (laser direct imaging) equipment that showed minimum line with
, proposed method shows comparable pattern resolution with very competitive price and shorter processing time. In terms of mass production, it can be applied to fabrication of large-area low cost applications including FPCB.
Effect of the Control of Bowing in Free-standing GaN by Mechanical Polishing
Gim, Jinwon ; Son, Hoki ; Lim, Tae-Young ; Lee, Mijai ; Kim, Jin-Ho ; Jeon, Dae-Woo ; Hwang, Jonghee ; Jung, Jung-Young ; Oh, Hae-Kon ; Kim, Jin-Hun ; Choi, YoungJun ; Lee, Hae-Yong ; Yoon, Dae-Ho ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 776~780
DOI : 10.4313/JKEM.2015.28.12.776
In this paper, we have studied the effect of mechanical polishing to Ga-polar face for reducing the wafer bowing and strain in free-standing GaN. After the mechanical polishing to Ga-polar face, the bowing of the free-standing GaN substrate significantly decreased with increasing the size of diamond slurry, and eventually changed the bowing direction from concave to convex. Furthermore, the full width at half maximum (FWHM) of high-resolution X-ray diffraction (HR-XRD) were decreased, especially the FWHM of (1 0 2) reflection for
size of diamond slurry was significantly decreased from 630 to 203 arcsec. In the case, we confirmed that the compressive strain in Ga-polar face was fully released by Raman measurement.
The Effect of Packing Density on the Warpage Behavior of Ni-Zn-Cu Ferrite Sheets
Kim, Shi Yeon ; Yeo, Dong-Hun ; Shin, Hyo-Soon ; Song, Woo Chang ; Yoon, Ho Gyu ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 781~786
DOI : 10.4313/JKEM.2015.28.12.781
It is necessary for ferrite sheets to be fabricated with high packing density for excellent electrical properties and high strength. In this study, the relationship between the warpage and the packing density of ferrite green sheet, was investigated with amount variation of organic additives. With 0.4 wt% of dispersant, the packing density was about 48% and warpage appeared 0.5~1.3 mm high. With 1.4 wt% of dispersant, the packing density increased up to 57% and warpage appeared 0.8~2.1 mm high. With high packing density, warpage appeared along the edges of specimen, while with low packing density, deformation appeared over whole specimen inhomogeneously. It is thought that inhomogeneous deformation after sintering came from the inhomogeneity in green sheet prepared with badly dispersed slurry. With good homogeneity in green sheet from well-dispersed slurry, isotropic shrinkage is thought to have occurred along the distance from center to edges of specimen during sintering.
An Analysis of the Growing Orientation of PMN-PT Single Crystal Using the Laue Back-Reflection Method
Joh, Cheeyoung ; Seo, Hee-Seon ; Kwon, Byung-Jin ; Lee, Won-Ok ; Lee, Sang-Goo ; Kim, Min-Chan ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 787~791
DOI : 10.4313/JKEM.2015.28.12.787
In this paper, the growing orientation of PMN-PT single crystal is analyzed using the Laue-Back Reflection Method. Two kinds of PMN-PT single crystals are grown using the Bridgman growing method in the  and  directions and their the Laue photographs are simulated assuming cubic crystal systems. From the comparison between simulation and test results, it can be concluded that the single crystals are grown in the desired crystal orientations.
Optimization of Slurry Preparation Process for Soft Magnetic Green Sheet
Oh, Sea Moon ; Lee, Chang Hyun ; Shin, Hyo Soon ; Yeo, Dong Hun ; Kim, Jin Ho ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 792~796
DOI : 10.4313/JKEM.2015.28.12.792
With high integration of electronic components, power inductors are also miniaturized. Recently, thick film processes for small size power inductors were developed and commercialized. However, the thick film process to prepare soft magnetic green sheets was not reported enough. In this study, we used Fe-Si magnetic and CIP (carbonyl iron powders) as starting materials to lead to a bimodal particle size distribution in the sheet. We proposed a newly developed 'Modified slurry preparation process' to get well dispersed condition even at high solid contents. Using the new process, it was possible to prepare a well dispersed slurry over 70 vol% of solid. BYK-103 was better than BYK-111 as dispersant in this slurry and the optimum amount was 0.6 wt%. The optimized slurry was formed into a sheet by tape casting process and then the sheet was laminated. We conformed that small size powder, large size powder, and epoxy resin were well dispersed in the green sheet.
Chitin Nanofibers Characterization for Flexible/Transparent Films
Hwang, Joong-Kook ; Seo, Eung-soo ; Chang, Sang-Mok ; Shin, Hoon-Kyu ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 797~801
DOI : 10.4313/JKEM.2015.28.12.797
In this study ensuring a filming technology is attempted through dispersion technologies and mixing polymer scaffolds in order to produce films based on the nanowaires obtained from chitin. In addition this study proposes technologies in measuring and improving characteristics of films produced using nanowires and for applying electric conductivity to the films as a chemical and physical manner. Also, a possibility in applications of mass productive films or substrates to producing flexible and transparent films is proposed. In the experiment implemented in this study, it is verified that developments of high strength, high transparency, and high flexibility films can be developed through combining it with producing flexible and transparent films.
Development of Piezoelectric Level Switch for High Temperature
Kim, Na-Ri ; Lee, Young-Jin ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 802~807
DOI : 10.4313/JKEM.2015.28.12.802
This paper describes the development of a piezoelectric level switch, which aims to effectively monitor the level status in high ambient temperatures. In order to adjust the impedance near the resonant frequency and temperature characteristics, the effect of the case and backing layer materials on its performance was analyzed using the finite element method (FEM). The suggested prototype new level switch has three heat-sink plates attached to SUS bar of 230 mm long, and case of PEEK which contains PZT sensing part. To illustrate the validity of this level switch, 10 samples are prepared and investigated the sensing performance through the high and low temperature ambient.
ITO Nanowires-embedded Transparent Metal-oxide Semiconductor Photoelectric Devices
Kim, Hyunki ; Kim, Hong-Sik ; Patel, Malkeshkumar ; Kim, Joondong ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 808~812
DOI : 10.4313/JKEM.2015.28.12.808
Highly optical transparent photoelectric devices were realized by using a transparent metal-oxide semiconductor heterojunction of p-type NiO and n-type ZnO. A functional template of ITO nanowires (NWs) was applied to this transparent heterojunction device to enlarge the light-reactive surface. The ITO NWs/n-ZnO/p-NiO heterojunction device provided a significant high rectification ratio of 275 with a considerably low reverse saturation current of 0.2 nA. The optical transparency was about 80% for visible wavelengths, however showed an excellent blocking UV light. The nanostructured transparent heterojunction devices were applied for UV photodetectors to show ultra fast photoresponses with a rise time of 8.3 mS and a fall time of 20 ms, respectively. We suggest this transparent and super-performing UV responser can practically applied in transparent electronics and smart window applications.
Commercialization & Process Optimization of Protective Film on Nano Silver Transparent Conductive Substrate by Means of Large Scale Roll-to-Roll Coating and Experimental Design
Park, Kwang-Min ; Lee, Ji-Hoon ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 813~820
DOI : 10.4313/JKEM.2015.28.12.813
We have studied commercialization and process optimization of protective film on transparent conductive coated substrate, nano silver on flexible PET (poly ethylene terephthalate), by means of roll-to-roll micro-gravure coater. Nanosilver on flexible PET substrate is potential materials to replace ITO (indium tin oxide). Protective film is most important to maintain unique silver pattern on top of transparent PET. PSA pressure sensitive adhesives) was developed solely for nano silver on PET and protective film was successfully laminated. We have optimized all process conditions such as coating thickness, line speed and aging time & temperature via experimental design. Transparent conductive film and its protective film developed in this research are commercially available at this moment.
Fabrication of Single Layer Anti-reflection Thin Film by Sol-gel Method
Park, Jong-Guk ; Jeon, Dae-Woo ; Lee, Mi-Jai ; Lim, Tea-Young ; Hwang, Jonghee ; Bae, Dong-Sik ; Kim, Jin-Ho ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 821~825
DOI : 10.4313/JKEM.2015.28.12.821
Anti-reflective (AR) thin film was fabricated on a glass substrate by sol-gel method. The coating solution was synthesized with TEOS (tetraethlyorthosilicate) and poly ethylene glycol (PEG, 4.0 wt%). As the withdrawal speed of coating was changed from 0.1 mm/sec to 0.3 mm/sec, the thickness and refractive index of prepared thin films were changed. The reflectance and transmittance of coating glass fabricated by the withdrawal speed of 0.1 mm/sec were 0.62% and 95.0% in visible light range. The refractive index and thickness of single layer thin film were n= 1.29 and ca. 99.0 nm.
Fabrication of Transparent Conducting Thin Film with High Hardness by Wet Process
Park, Jong-Guk ; Jeon, Dae-Woo ; Lee, Mi-Jai ; Lim, Tea-Young ; Hwang, Jonghee ; Kim, Jin-Ho ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 826~830
DOI : 10.4313/JKEM.2015.28.12.826
Transparent Ag nanowire conducting thin films with high surface hardness were fabricated by bar coating method. When coating speed was changed from 35 mm/sec to 50 mm/sec, the transmittance of coated glass increased from 65.3% to 80.8% in visible light range and the surface resistance was changed from
. The surface hardness and adhesion of thin film were 5H and 5B.
Partial Discharge Characteristics of Metallic Particles Under HVDC in SF
Kim, Sun-Jae ; Jo, Hyang-Eun ; Wang, Guoming ; Yun, Min-Young ; Kil, Gyung-Suk ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 831~836
DOI : 10.4313/JKEM.2015.28.12.831
This paper dealt with the PD (partial discharge) characteristics produced by metallic particles presented in a gas insulated switchgear. Four types of metallic particles such as a ball, a trapezoid, a rectangle, and a twist were fabricated and placed in a PD cell filled with
gas. PD pulses were detected through a
non-inductive resistor. Calibration was carried out according to IEC 60270 and the sensitivity was calculated as 4 mV/pC. Apparent charge, pulse count, DIV (discharge inception voltage), DEV (discharge extinction voltage), and TRPD (time resolved partial discharge) were analyzed. Among the metallic particle types, the twist frequently occurred PD pulse at the lowest DIV, while the rectangle showed the highest. DEV of the twist was about 2 times lower than that for the rectangle. Kurtosis of ball clustered at high value, and skewness of other three metallic particles distributed at low value. TRPD showed different distribution by metallic particle types.
A Study on Electrostatic Electrification Relaxation Properties of Glass Filament for Insulation
Lee, Sung Ill ; Lee, Won Jae ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 837~842
DOI : 10.4313/JKEM.2015.28.12.837
In this study, the characteristics of electrostatic attenuation in plain shape glass filament sample (0.29 mm thickness, cross section of
) for insulator has been measured at temperature of
, humidity of 50%~90%. The results of this study are as follows. In case of samples that the cross section is
at humidity of 50%~90%, it found that the electrification voltage of electrostatic increased with increasing temperature, with a return to decrease at
. In case of samples that the cross section is
at temperature of
, it found that the electrification voltage of electrostatic decreased with increasing humidity. In case of the sample at temperature of
and humidity of 65%, 75%, it found that the electrification voltage of electrostatic increased with increasing cross section. In case of the sample at humidity of 65% and cross section of
, the time that it takes to reduce electrification voltage of electrostatic in half decreased to 0.912s, 0.736s, 0.673s with increasing temperature to
Reliability Evaluation on PTC Heater Using Accelerated Life Test and Failure Analysis
Choi, Hyoung-Seuk ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 843~846
DOI : 10.4313/JKEM.2015.28.12.843
In this paper, the failure mechanism of PTC heater were examined closely by failure analysis and based on it, accelerated life test were conducted. Finally, life distribution and acceleration model were established. The failure mechanism of PTC heater such as crack, increase of resistance due to heating were identified. Two acceleration factors such as temperature, humidity were chosen with two levels each and accelerated life test were done. Life distribution were identified as Weibull distribution with shape parameter 5.4 and Temperature-Humidity model was fitted as an acceleration model.
The Effects of Al-substitution on Thermoelectric and Charge Transport Properties of BiCuOSe Compounds
An, Tae-Ho ; Lim, Young Soo ; Seo, Won-Seon ; Park, Cheol-Hee ; Park, Chan ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 847~851
DOI : 10.4313/JKEM.2015.28.12.847
The effects of Al-substitution on thermoelectric and charge transport properties of BiCuOSe compounds were investigated. The compounds were prepared by a solid-state reaction and consolidated by SPS (spark plasma sintering). In spite of the increase in the hole concentration with increasing Al amounts in BiCuOSe compound, the electrical conductivity at room temperature was kept constant due to the reduction of mobility. However, electrical conductivities of Al-substituted BiCuOSe compounds at elevated temperature (> 600 K) were higher than those of BiCuOSe, and this result was discussed in terms of it's the band gap energy. The Seebeck coefficient was drastically reduced when Al was substituted in Bi site, which indicated that the electronic structure was influenced by the Al-substitution into Bi-site.
Effect of High-Energy Ball Milling on Thermoelectric Transport Properties in CoSb
Nam, Woo Hyun ; Meang, Eun-Ji ; Lim, Young Soo ; Lee, Soonil ; Seo, Won-Seon ; Lee, Jeong Yong ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 28, issue 12, 2015, Pages 852~856
DOI : 10.4313/JKEM.2015.28.12.852
In this study, we investigate the effect of high-energy ball milling on thermoelectric transport properties in double-filled
powders are milled using high-energy ball milling for different periods of time (0, 5, 10, and 20 min), and the milled powders are consolidated into bulk samples by spark plasma sintering. Microstructure analysis shows that the high-energy ball milled bulk samples are composed of nano- and micro-grains. Because the filling fractions are reduced in the bulk samples due to the kinetic energy of the high-energy ball milling, the carrier concentration of the bulk samples decreases with the ball milling time. Furthermore, the mobility of the bulk samples also decreases with the ball milling time due to enhanced grain boundary scattering of electrons. Reduction of electrical conductivity by ball milling has a decisive effect on thermoelectric transport in the bulk samples, power factor decreases with the ball milling time.