• Proceedings of the KIEE Conference
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• 1998.07d
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• pp.1355-1357
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• 1998

TFT의 게이트 절연막으로 사용되는 절연체는 우수한 절연특성과 낮은 계면포획전하밀도($D_{it}$)를 요구한다. 이에 본 연구에서는 우수한 절연특성을 가지며, 격자상수가 Si과 유사한 $CaF_2$의 증착 특성을 연구하였다. 진공증착법을 이용하여 p형 Si(100) 기판위에 $CaF_2$의 기판온도, 두께를 변화시켜 전기적, 구조적 특성을 평가하였다. 또한 Si 기판에 방향에 따른 박막의 특성을 조사하였다. 구조적 특성분석으로부터 Si(100) 기판의 경우 $CaF_2$는 (200)방향으로 주도적인 성장을 하였으며 기판온도를 상승시킴에 따라 (220)방향으로도 성장을 하는 것으로 나타났다. 열처리 전후의 구조적 특성은 SEM을 통해서 확인 할 수 있었다. 열처리 전후의 특성 변화로부터 저온($100^{\circ}C$이하)에서는 기판과의 성장방향과 동일하였으며 고온($200^{\circ}C$이상)에서는 기판방향과는 다른 방향 성장 결과를 얻었다. 전기적 특성평가를 위하여 C-V 특성을 평가하였다. C-V 특성으로부터 Si(100) 기판의 온도가 $100^{\circ}C$, $1455\AA$ 두께로 증착한$CaF_2$ 박막의 $D_{it}$는 $1.8{\times}10^{11}cm^{-1}eV^{-1}$로 낮은 값을 가지 고 있었으며 0.1MV/cm에서 누설전류밀도가 $10^{-8}A/cm^2$ 이었다.

• Applied Chemistry for Engineering
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• v.19 no.4
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• pp.357-365
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• 2008

Hydrogen energy becomes more attractive in that it can resolve the exhaustion of fossil fuels and their environmental problems. Until now, water electrolysis has been a interesting technique to produce hydrogen from non-fossil fuels. In principle, water electrolysis is an environmentally friendly technique to split water into hydrogen and oxygen, so that it can be utilized without any limitation of resources. Herein, we introduce basic understanding and three types of water electrolysis. Furthermore, the research trend and patent analysis will be followed along with an outlook.

• Food Science of Animal Resources
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• v.22 no.3
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• pp.234-239
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• 2002

The use of electrical stimulation in the red meat processing has been inconsistent and the mechanism(s) associated with the improvement of meat quality in electrically stimulated carcass has been disputed. This may reflect an incomplete knowledge of how to optimise the technology and also mirrors the existence of unknown factors. Although it is well established that the stimulation treatment increases the rate of post-mortem glycolysis, other biochemical and biophysical effects have been implicated with the use of this technology. The classical view that stimulation prevents muscle from shortening excessively during rigor development has been expanded to include the possibility that it also results in physical disruption of muscle structure and early 'turn-on' of tenderizing process. However, the interaction of these effects with the acceleration of the rate of proteolysis through activation of the calpain pretense system has not been comprehensively unravelled. This mini-review attempts to examine the current theories about the effect of stimulation on post-mortem muscle.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.6
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• pp.85-88
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• 2009

This paper shows a reasonable power density, that was made by the systematic and statistical way considering actual conditions, such as investigated power consumption capacity for the year and peak power, contract power for the last 5 years of each customer for 23 general customers all data obtained by AMR. In this dissertation, it is necessary to analyze the key features from the investigated data. It made an analysis of the feature parameters, such as average, standard deviation, median, maximum, minimun and load factor.

• Fire Science and Engineering
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• v.23 no.3
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• pp.17-22
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• 2009

Epoxy powder is being in use for insulation materials widely. Especially, in cause of coating insulation can be caused electrical fire and explosion by Joul's heat. This study has been compared and examined around breakdown, arc discharge, and V-t about insulation of Epoxy powder. Also, it has been researched about insulation which is cause of electrical fire and its basic data. According to temperature change, sample KS was stable before the Tg to be about $8{\sim}10%$ decrease in the breakdown test. In case of V-t and arc discharge, it had been kept up suitable characteristic. Also, in case of electrical characteristic, sample KS has excellent capacity.

• Journal of the Korea Society of Computer and Information
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• v.24 no.10
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• pp.159-165
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• 2019

About 58% of fires are electric fires. In this study, we analyzed the factors of fire caused by electricity and studied the system that can prevent fire in advance. In order to prevent disasters, basically, various electrical IoT sensors are needed to detect fire signs. Each of these sensors continuously receives a lot of situation information and sends it to the main system. The collected big data continuously checks whether the disaster is over the threshold that can cause disaster through pattern analysis, and can check whether there is any problem by comparing the data. In the event of a threshold, alarms are signaled and problems are reported. This prevents fire by preventing electrical problems such as overcurrent and leakage current.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.35 no.1
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• pp.32-36
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• 2022

AGZO thin films were deposited on glass substrates using RF magnetron sputtering system under Ar flow rates, and their structural, electrical, and optical properties were analyzed systematically. As a result of the XRD pattern, the peak of the (002) (2θ≈33.7˚) orientation was observed, and it was found to have a hexagonal wurtzite structure. The sheet resistance of Ar 5 sccm was 3.073×10² Ω/sq and showed the best electrical properties because of the improvement of mobility due to the increase of the grain size and the variation of RMS roughness. In addition, the average transmittance was more than 90% for all samples, which demonstrated good optical properties. It is expected that the TCO characteristics can be improved by controlling Ar flow rates, and this will increase the efficiency of photoelectronic devices such as OLED and solar cells.

• Progress in Superconductivity and Cryogenics
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• v.10 no.1
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• pp.52-56
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• 2008

According to the improvement of HTS conductor, HTS tapes which have the high current capacity have been recently researched in several nations. For large power application, AC loss is the most important issue in the development of AC superconducting power devices because it is closely related to the system operation efficiency. In 1st generation wire of HTS conductor, BSCCO, AC loss is too large to use for power application. Also, It is well known in recently years that YBCO CC, the 2nd generation wire, has also too much AC loss to apply to AC power devices. There are many trials to develop the new HTS wire having the low AC loss around the world. In this research, we present the measurment result of magnetization losses in SmBCO coated conductors. We measured the magnetization loss generated by perpendicularly exposed external magnetic field and compared with the analytic value of the strip model. Also, we presented the results compared with measured magnetization loss of an YBCO coated conductor.

• Progress in Superconductivity and Cryogenics
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• v.10 no.1
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• pp.42-47
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• 2008

In this paper, the fault current limiting characteristics for the superconducting fault current limiter(SFCL) using magnetic coupling between two coils were investigated. The SFCL consists of a high-$T_c$ superconducting(HTSC) element and two coils. This SFCL has different characteristics that depend on the connection form, the winding direction and the inductance ratio of two coils. The impedance and the operational current of the SFCL can be adjusted higher or lower than the resistance and the critical current of HTSC element. Therefore, the SFCL can change the amplitude of the limited fault current. To confirm it, the HTSC element was modeled and the fault current limiting characteristics of the SFCL were analysed through computer simulation. It was obtained from the analysis that the connection form and the winding direction of two coils of the SFCL were the important design parameters.

• Progress in Superconductivity and Cryogenics
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• v.11 no.1
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• pp.16-19
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• 2009

Recently, for improvement of the magnetic field of high temperature superconductor (HTS) apparatus, many studies investigating on operating in the range of $20{\sim}65K$ with liquid helium or the conducting method using cryocooler is actively reviewed. Also, the cooling method using solid nitrogen as cryogen is being suggested. Since the nitrogen has very large specific heat in solid state, it is expected that it can enable long time operation without a continuous supply of cooling energy. However, there is still insufficient data on the characteristics of solid nitrogen such as thermodynamic properties and liquid-solid phase change. Especially, there was almost no study done on the electrical insulation properties of solid nitrogen so far. In this study, solid nitrogen to find the electrical characteristics was made by using cryocooler and cryostat, and investigated the flashover discharge and breakdown. The results of this study will be useful as a basic data for electrical insulation design of the HTS system using solid nitrogen as cryogen.