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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
Journal Basic Information
Journal DOI :
The Korean Institute of Electrical and Electronic Material Engineers
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Volume & Issues
Volume 20, Issue 12 - Dec 2007
Volume 20, Issue 11 - Nov 2007
Volume 20, Issue 10 - Oct 2007
Volume 20, Issue 9 - Sep 2007
Volume 20, Issue 8 - Aug 2007
Volume 20, Issue 7 - Jul 2007
Volume 20, Issue 6 - Jun 2007
Volume 20, Issue 5 - May 2007
Volume 20, Issue 4 - Apr 2007
Volume 20, Issue 3 - Mar 2007
Volume 20, Issue 2 - Feb 2007
Volume 20, Issue 1 - Jan 2007
Selecting the target year
Fabrication and Characterizations of Nickel Metal Mask with fine Pitch by Additive Process
Park, Eui-Cheol ; Lim, Jun-Hyung ; Kim, Kyu-Tae ; Park, Si-Hong ; Hwang, Soo-Min ; Shim, Jong-Hyun ; Jung, Seung-Boo ; Kim, Bong-Soo ; Joo, Jin-Ho ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 925~931
DOI : 10.4313/JKEM.2007.20.11.925
We successively fabricated the Ni metal mask by additive method and evaluated the effects of wetting agents addition on the microstructure, hardness, and friction coefficient. In the process, the additive patterns with fine hole and pitch were made by photolithography technique and subsequently Ni plate was electroformed on the patterns. We found that the microstructure and mechanical properties were significantly varied when the different combinations of the wetting agents were used. When the wetting agents of both SF-1 and SF-2 were added, the microstructure consisted of crystal and amorphous phases, the grain size reduced to 5-40 nm, the RMS value decreased to 11.4 nm and the wear resistance improved. In addition, the hardness was as high as 638 Hv which is higher than that of commercial stainless steel mask and this improvement is probably due to the presence of amorphous Phase and fine grain size. The improvement of the wear resistance can provide a higher reliability and a longer service life.
Properties of ZnO Thin Films Grown by Radio-frequency Magnetron Sputtering in terms of O
/Ar Mixture Flow Ratio
Cho, Shin-Ho ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 932~938
DOI : 10.4313/JKEM.2007.20.11.932
The structural, optical, and electrical properties of ZnO thin films grown on glass by radio-frequency (rf) magnetron sputtering were investigated. The mixture flow ratio of
to Ar, which was operated with sputtering gas, was chosen as a parameter for growing high-qualify ZnO thin films. The structural properties and surface morphologies of the thin films were characterized by the X-ray diffraction and the atomic force microscope, respectively. As for the optical properties of the films, the optical absorbance was measured in the wavelength range of 300-1100 nm by using UV-VIS spectrophotometer. The optical transmittance, absorption coefficient, and optical bandgap energy of ZnO thin films were calculated from the measured data. The crystallinity of the films was improved and the bandgap energy was increased from 3.08 eV to 3.23 eV as the oxygen flow ratio was increased from 0 % to 50 %. Furthermore, The ultraviolet and violet luminescences were observed by using photoluminescence spectroscopy. The hall mobility was decreased with the increase of oxygen flow ratio.
Hole Mobility Enhancement in (100)- and (110)-surface of Ultrathin-body(UTB) Silicon-on-insulator(SOI) Metal Oxide Semiconductors Field Effect Transistor
Kim, Kwan-Su ; Cho, Won-Ju ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 939~942
DOI : 10.4313/JKEM.2007.20.11.939
We investigated the characteristics of UTB-SOI pMOSFETs with SOI thickness(
) ranging from 10 nm to 1 nm and evaluated the dependence of electrical characteristics on the silicon surface orientation. As a result, it is found that the subthreshold characteristics of (100)-surface UTB-SOI pMOSFETs were superior to (110)-surface. However, the hole mobility of (110)-surface were larger than that of (100)-surface. Especially, the enhancement of effective hole mobility at the effective field of 0.1 MV/cm was observed from 3-nm to 5-nm SOI thickness range.
Influence of Hydrogen and Oxygen Plasma Treatment on the Structural Properties of Carbon Nanotubes
Lee, Jae-Hyeong ; Nah, Chang-Woon ; Park, Dae-Hee ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 943~947
DOI : 10.4313/JKEM.2007.20.11.943
The effect of hydrogen and oxygen plasma treatments on the structural properties of carbon nanotube(CNT) has been systematically investigated. As the plasma power was increased, nano particles were appeared at the surface of CNTs. At high plasma power(300 Watt), the structure of CNT was changed from nanotube type to nano particles. However, in case of hydrogen plasma treatment, there was no change in microstructure of CNT. From the Raman analysis, the crystallinity of CNT was deteriorated by the plasma treatment, regardless of gas types.
Electrical Properties of Thickness-Vibration-Mode Multilayer Piezoelectric Transformer using Low Temperature Sintering (Pb,Ca,Sr,)(Ti,Mn,Sb)O
Yoo, Ju-Hyun ; Yoo, Kyung-Jin ; Kim, Do-Hyung ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 948~952
DOI : 10.4313/JKEM.2007.20.11.948
In this study, a low temperature sintering multilayer piezoelectric transformer for a DC-DC converter was manufactured using
ceramics. Its electrical properties were investigated according to the variation in frequency and load resistance. The voltage step-up ratio of the multilayer piezoelectric transformer showed a maximum value at a resonant frequency of input part and increased with an increase of load resistance. The efficiency of the multilayer piezoelectric transformer showed the highest value at a load resistance of 17
. The output power was increased with increasing input voltage. Temperature increase of the multilayer piezoelectric transformer was increased with the increase of output power. At the load resistance of 17
, the multilayer piezoelectric transformer showed the temperature rises of about
at the output power of 18 W, and stable driving characteristics.
Electrical Properties of Multilayer Actuator Structured-ultrasonic Nozzle Driving System using a Resonant Inverter
Hwang, Lark-Hoon ; Kim, Hwa-Soo ; Kim, Kook-Jin ; Yoo, Ju-Hyun ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 953~958
DOI : 10.4313/JKEM.2007.20.11.953
In this paper, multilayer actuator structured-ultrasonic nozzle and resonant inverter driving circuit were manufactured, respectively. Its electrical properties were investigated. Multilayer actuator structured ultrasonic nozzle was fabricated using PMN-PNN-PZT ceramics showing excellent piezoelectric characteristics. In order to drive ultrasonic nozzle, resonant PWM inverter was used. The purpose of this study is to find the optimal driving condition of ultrasonic nozzle. Accordingly, electrical and temperature characteristic of multilayer ultrasonic driving system were investigated by experiments as a function of the series resonance inductance. The driving current of ultrasonic nozzle showed the maximum current of 27 mA. Also, the surface temperature of ceramic vibrator showed
at driving time for 20 min. The ultrasonic nozzle was stably operated in the case of driving for more than 20 min.
Partial Discharge Distribution Analysis on Interlace Defects of Cable Joint using K-means Clustering
Cho, Kyung-Soon ; Hong, Jin-Woong ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 959~964
DOI : 10.4313/JKEM.2007.20.11.959
To investigate the influence of partial discharge(PD) distribution characteristics due to various defects on the power cable joints interface, we used the K-means clustering method. As the result of PD number(n) distribution analyzing on
graph, the phase angle(
) of cluster centroid shifted to
increasing with applying voltage. It was confirmed that the PD quantify(q) and euclidean distance of centroid were increased with applying voltage from the centroid distribution analyzing of
plane. The dispersion degree was increased with calculated standard deviation of the
cluster centroid. The PD number and mean value on
graph were some different by electric field concentration with defect types.
Dependences of Various Substrate Temperature on the Structural and Electrical Properties of ZnO Thin Films deposited by RF Magnetron Sputtering
Oh, Su-Young ; Kim, Eung-Kwon ; Lee, Tae-Yong ; Kang, Hyun-Il ; Lee, Jong-Hwan ; Song, Joon-Tae ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 965~968
DOI : 10.4313/JKEM.2007.20.11.965
In this study we investigated the variation of the substrate temperatures using RF sputtering to identify the effect on the structure and electrical properties by c-axis orientation of ZnO thin film. ZnO thin films were prepared on Al/Si substrate. In our experimental results, ZnO thin film at
was well grown with (002) peak of ZnO thin film, the thin film showed the high resistivity with the value of
and the roughness with 27.06 nm. As increased the substrate temperatures, the grain size of ZnO thin films was increased. From these results, we could confirm the suitable substrate temperature of ZnO thin films for FBAR(film bulk acoustic resonator).
Electro-optical Simulation of Twist Nematic Liquid Crystal Displays considering Anchoring Energy
Jung, Jin-Taek ; Park, Woo-Sang ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 969~976
DOI : 10.4313/JKEM.2007.20.11.969
In this thesis, an anchoring energy in the upper and lower substrates of TFT-LCD cell has been modeled and applied in the numerical calculation of the molecular orientation of the TN-LCD. The molecular orientation of liquid crystals defined as tilt and twist angles was simulated using the Newton-Raphson method and the Gaussian integration method. From the results, the tilt and twist angles for the strong anchoring energy were proven to be coincide with those of the conventional results. on the other hand, for the weak anchoring energy, azimuth angles of the molecules were changed abruptly from
near the middle area of the cell due to the balance of the anchoring energy and the elastic energy of the liquid crystals.
A Study on the Realization of the High Efficiency LCD Photoresist Removal Technology
Son, Young-Su ; Ham, Sang-Yong ; Kim, Byoung-Inn ; Lee, Sung-Hwee ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 977~982
DOI : 10.4313/JKEM.2007.20.11.977
The realization of the photoresist(PR) removal method with vaporized water and ozone gas mixture has been studied for the LCD TFT array manufacturing. The developed PR stripper uses the water boundary layer control method based on the high concentration ozone production technology. We develop the prototype of PR stripper and experiment to find the optimal process parameter condition like as the ozone gas flow/concentration, process reaction time and thin boundary layer formation. As a results, we realize the LCD PR strip rate over the 0.4
and this PR removal rate is more than 5 times higher than the conventional immersion type ozonized water process.
New Edge Structure of a Pixel Electrode for Improving the Transmittance of the Fringe Field Switching(FFS) Mode LCD
Lee, Won-Jun ; Park, Woo-Sang ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 983~990
DOI : 10.4313/JKEM.2007.20.11.983
In this study, we propose a new pixel edge shape of the fringe field switching(FFS) mode which ensures more stable movement of liquid crystal molecules and higher transmittance at the edge part. the electro optical properties were calculated 3-dimensionally using by commercially available "Techwiz LCD". From the simulation results, we showed that the dynamic stability of liquid crystal molecules was obtained in a new pixel structure. We also revealed that the transmittance of the new pixel structure increased more than 6 % compared to that of the conventional pixel structure.
Design and Characteristics of Anti-reflection Coating using Multi-layer Thin Film on the Ferrule Facet
Ki, Hyun-Chul ; Yang, Mung-Hark ; Kim, Seon-Hoon ; Kim, Tea-Un ; Kim, Hwe-Jong ; Gu, Hal-Bon ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 991~994
DOI : 10.4313/JKEM.2007.20.11.991
In this paper, we have designed the anti-reflection(AR) coating for
nm wavelength range on the ferrule facet of optical connector. The low-temperature ion-assisted deposition was applied to AR coating on the ferrule facet in order to avoid damage of optical connector. We have measured the refractive index of coating film(
) using the ellipsometer and optimized the film thickness using the SEM and thickness measurement equipment. UV-VIS-NIR spectrophotometer is used to measure transmissivity of the AR coated ferrule facet. The refractive index of
, respectively, for
nm wavelength range. The transmissivity of the AR coated ferule facet is more than 99.8 % for
nm wavelength range and more than 99.5 % for
nm wavelength range. The return loss of the AR coated ferrule facet is 30.1 dB.
Characteristic Analysis of a Flux-Lock Type SFCL Considering Magnetization Characteristic of Iron Core
Lim, Sung-Hun ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 995~999
DOI : 10.4313/JKEM.2007.20.11.995
We investigated the characteristics of a flux-lock type superconducting fault current limiter(SFCL) considering magnetization characteristic of iron core. The flux-lock type SFCL, like other types of SFCLs using the iron core, undergoes the saturation of the iron core during the initial fault time. Therefore, if the design to prevent the saturation of the iron core is considered, the effective fault current limiting operation can be achieved. Through the analysis for its equivalent circuit including the magnetization characteristic of the iron core, the limiting impedance of the flux-lock type SFCL was drawn. The magnetization currents and the limited currents of SFCL, which were dependent on the winding direction and the turns` ratio between two coils, were investigated from the short circuit experiment. It was confirmed that their experimental results agreed with the analysis ones.
Effect of the Coaling and Annealing on Noncorrosive of Fuel Cell Separator
Kim, Gwi-Yeol ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 1000~1003
DOI : 10.4313/JKEM.2007.20.11.1000
The molten carbonate fuel cell has conspicuous feature and high potential in being used as an energy converter of various fuel to electricity and heat. However, the molten carbonate fuel cell which use strongly corrosive molten carbonate at
have many problem. One of the material problems is the severe corrosion of the metallic components, such as the separator. The effect of coating and annealing treatment on the corrosion for SUS 304 and SUS 430 which are the candidate materials for molten carbonate fuel cell hardware has been investigated in molten carbonate at
by using steady state polarization and electrochemical impedance spectroscopy method. It was found that the corrosion current of these SUS 304 and SUS 430 decreased with coating and annealing treatment.
Temperature Analysis of the De-icing System for Overhead Contact Wire
Ko, Byeong-Hun ; Park, Young ; Jung, Ho-Sung ; Kwon, Sam-Young ; Park, Hyun-June ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 1004~1008
DOI : 10.4313/JKEM.2007.20.11.1004
The ice coats are built on 25 kV overhead contact wire when the temperature is lower than
. It generates shockwaves at the mechanical interface of the collecting strips of the pantograph and the contact wire. The de-icing processes should be performed to avoid shockwaves which are generated by a pulsed high-voltage arc discharge. This paper presents temperature analysis of the de-icing effects which could be applied to the overhead contact wire of railways using Joule heat. The results show that 350 A is the proper current for
conductor according to environmental condition such as velocity of air stream, ambient temperature and moisture.
The Study on Aged Sleeves for Old Transmission Lines
Kim, Byung-Geol ; Kim, Shang-Shu ; Sohn, Hong-Kwan ; Park, In-Pyo ; Jang, Tae-In ; Kim, Jin-Han ;
Journal of the Korean Institute of Electrical and Electronic Material Engineers, volume 20, issue 11, 2007, Pages 1009~1014
DOI : 10.4313/JKEM.2007.20.11.1009
A detailed study on aged sleeves for old transmission lines was carried out to clarify the deterioration of sleeves and the condition of installation. A lot of removed aged sleeves from transmission lines were investigated. Many biased installed cases and corrosion of steel sleeve part were found. These defects can cause a serious accident such as blackout during operating. The temperature distribution within sleeve of ACSR conductor was precisely measured and examined, conducted as part of series of studies on large currents in transmission lines. According to measurements of the conductor temperature near a joint(sleeve and clamp), the electrical resistance of joint is lower than that of the same length conductor. The detailed results were presented in the text.