• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.11a
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• pp.246-247
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• 2005

본 연구에서는 활성탄소의 표면 작용기와 전해액, 결합제의 분해반응을 줄여서 내구성을 향상시키기 위해 $H_2$ 기체의 Spill-Over 현상을 이용하여 활성탄소 표면의 작용기를 치환시킨 시료를 사용하여 전극을 구성하였다. $H_2$기체로 활성탄소를 700$^{\circ}C$에서 열처리한 결과, 원소 분석기 (Elemental Analyzer)를 이용한 원소 분석 시에 산소의 비율이 1.4%로 활성탄소의 2.44%에 비해 감소함을 알 수 있었고, Carbon의 비율이 700$^{\circ}C$에서 94.3%로 증가함을 알 수 있었다. 또한, 활성탄소를 사용한 전극을 1.2M TEABF$_4$/Acetonitrile 전해액을 사용하여 커패시터를 구성 했을 때, 1kHz의 AC저항은 700$^{\circ}C$에서 열처리한 활성탄소가 0.58\Omega$로 활성탄소의 1.300에 비해 양호한 전기화학 특성을 나타내었다.

• Journal of the Korean Home Economics Association
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• v.11 no.2
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• pp.166-188
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• 1973

This thesis chiefly to investigate and study about the historic transition of the dress and ornament which is based on the costume of the folk dance. The folk dance is devide into the styled of the Court and common people I. Investigated and studied on the description of Hak-mu (the crane), Ryun-wha-dae (the lotus blossom) and chu-yong dance (a mask drama) which are the typical models among the folk dance on the view of the scale and history of playing. This research materials are made on abstract of Ak-Hak-Gyae-Bum (the pattern of the music which was compiled by Sung-hyun on the King of Sung-Jong of Yi-dynasdty) and selected from the conservation material and playing in the National Classical Music Bureau nowadays. I am sure the understanding the style of common people is to investigate and research the folk dance which is specified and conserved by cultural property control Bureau. Generally Bong-San mask dance is the typical mask drama on the view of the scale and transmitted, which occupies the wide range of the folk dance. So I selected it as the research material. I am interested in the historic origin and the structure of the dress and ormant conserved till the nowadays and so can catch the hidden conception about the colour and concern of religion in the Korean peculiar living consciousness. From this point, the study of the classical folk costume is activated in this part and I hope this poor article will become a small assistance for another study.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.19 no.8
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• pp.744-748
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• 2006

Emission characteristics of terbium-activated $InBO_3$ under cathode-ray(c.r.) and vacuum ultra violet(v.u.v.) irradiation have been investigated as a functions of norminal compositions and firing conditions. From the x-ray analysis, it was found that some of the synthesized samples contained excess $In_2O_3$ and the amount of the excess $In_2O_3$ varied with the norminal composition and heat treatment conditions. The samples with remanent excess $In_2O_3$ showed lower luminescence intensities than the ones free of excess $In_2O_3$. The phosphors of norminal composition of $InBO_3+10mol%B_2O_3:2mol%Tb$ synthesized at $1250^{\circ}C$ showed excellent CL and PL properties.

• Restorative Dentistry and Endodontics
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• v.26 no.5
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• pp.387-392
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• 2001

When cavity floor is near the pulp, polymerization of light-activated restorations results in temperature increase. This temperature increase cause by both the exothermic reaction process and the energy absorbed during irradiation. Therefore instating base is required. Most frequently used insulating base is glass ionmer. The purpose of this study was to evaluate intrapulpal temperature changes of glass ionomer according to various curing intensity and curing time. Caries and restoration-free mandibular molars extracted within three months were prepared Class I cavity of 3$\times$6mm with high speed handpiece. 1mm depth of dentin was evaluated with micrometer in mesial and distal pulp horns. Pulp chambers were filled with 37.0$\pm$0.1$^{\circ}C$ water to CEJ. Chromium-alumina thermocouple was placed in pulp horn for evaluating of temperature changes. glass ionomer material was placed in 2mm. total curing time was 40s: continuous 40s, intermittent 20s, intermittent 10s. Glass ionomer material was cured with 300mW/$\textrm{cm}^2$, 550mW/$\textrm{cm}^2$ light curing unit. The results were as follows : 1. Temperature in pulp increased as curing unit power is increased. 2. Temperature in pulp more increased continuous emission than intermittent emission.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.546-546
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• 2013

Zinc silicate ($Zn_2SiO_4$) has been identified as a suitable host material for a wide variety of luminescent activators, such as transition metal and rare earth elements. In particular, manganese-activated $Zn_2SiO_4$ exhibits highly efficient photoluminescenceand cathodoluminescence, which allows this material to be used in fluorescent lamps and display applications. In this study, we investigated the green and yellow luminescence from Mn-doped $Zn_2SiO_4$ thin films that were synthesized using radio frequency magnetron sputtering followed by annealing at $600{\sim}1,200^{\circ}C$ The refractive index of the $Zn_2SiO_4$: Mn films showed normal dispersion behavior. It was found that the $Zn_2SiO_4$: Mn films annealed at $800^{\circ}C$ ossessed a mixture of alpha and beta phases. The obtained photoluminescence spectrum consisted of two emission bands centered at 525 nm in the green range and 574 nm in the yellow range. The green luminescence originates from the divalent Mn ions in alpha phase of $Zn_2SiO_4$, while the yellow luminescence comes from the divalent Mn ions in beta phase. The films annealed at and above $900^{\circ}C$ xhibited only the alpha phase. The broad PL excitation band was observed ranging from 220 to 300 nm with a maximum at around 243 nm.

• Korean Journal of Human Ecology
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• v.20 no.6
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• pp.1135-1151
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• 2011

This study examined green consumption behavior according to the lifestyles of college students. The data were collected from 314 college students in Yeungnam region by a self-administered questionnaire. Frequencies, Cronbach's alpha, factor analysis, cluster analysis, chi-square tests, one-way analysis of variance, Duncan's multiple range tests, Pearson's correlation analysis, and multiple regression analyses were conducted by SPSS Windows V.18.0. According to the result of factor analysis, lifestyles were categorized into six factors: thrift-saving type, enthusiastic activity type, brand ostentation type, freedom-seeking type, material oriented type, and practice-seeking type. Cluster analysis showed respondents belonged to one of four groups: thrift practice group, indifference group, freedom-seeking group, and material ostentation group. The levels of green purchase behavior, green usage behavior and green disposal behavior of the respondents was not high. The thrift practice group showed higher levels of green purchase behavior, green usage behavior, and green disposal behavior. Finally, according to multiple regression analyses, environmental consciousness, knowledge about green consumption, lifestyle groups were the significant factors affecting green consumption behaviors. These results imply that green consumption education for college students should be activated to induce green life.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.28 no.12
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• pp.765-770
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• 2015

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.

• Environmental Engineering Research
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• v.22 no.2
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• pp.210-215
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• 2017

Produced water is the largest wastestream of oil and gas exploration. It consists of various organic and inorganic compounds that hinder its beneficial use. This study compared the treatment of produced water in a batch suspended and biofilm activated sludge process. The biofilm carrier material was made from Gardenia Carinata shell. COD, $NH_4{^+}-N$ and $NO_3-N$ removal was monitored in both the suspended (control) and floating carrier bioreactors. The results show a rapid reduction of produced water constituents in the floating carrier bioreactor. COD, $NH_4{^+}-N$ and $NO_3-N$ removal was in the range of 99%, 98% and 97% for the floating carrier bioreactor whereas it was 88%, 84% and 83% for the control bioreactor. The rapid reduction of COD, $NH_4{^+}-N$ and $NO_3-N$ clearly indicate that the floating carrier materials served as an attached growth medium for microorganisms, improved the breakdown of produced water constituents and reduced inhibition of microbial metabolic activities.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.06a
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• pp.326-326
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• 2008

일반적인 고상반응법을 이용하여 $Eu^{2+}$ 활성화 $\alpha$-sialon 황색 형광체를 합성한 후 구조 및 광학특성을 측정하였다. $Ca^{2+}$와 $Si^{4+}$ 이온의 비화학양론적 첨가에 따른 광학 특성 측정결과, 중심 발광 파장이 약 585 nm 인 높은 휘도의 황색형광체를 얻을 수 있었다. 본 연구에서는 $Ca^{2+}:Si^{4+}$ 첨가비에 따른 광학특성 변화를 관찰하였으며, 이를 바탕으로 구조 및 미세구조 변화에 대한 연구를 수행하였다. 20 mol%의 Al deficient 조성을 갖는 형광체의 광학특성 측정결과 화학양론조성에 비해 20% 이상의 휘도향상을 나타내었다. 이와 같은 결과로부터, 본 연구에서 제시된 Al deficient $\alpha$-sialon 황색 형광체는 자외선 및 청색 LED용 형광체로 적합할 것으로 판단된다.

• Korean Chemical Engineering Research
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• v.56 no.5
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• pp.694-704
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• 2018

Novel $SnO_2$ mixed biochar composite was prepared from banana peel developed as electrode material for supercapacitor using simple chemical co-precipitation method. The physiochemical and morphological properties of activated composite $SnO_2$ mixed biochar were investigated with XRD, FTIR, UV-vis, FESEM and HRTEM. The composite accounts for outstanding electrochemical behavior such as high specific capacitance, significant rate capability and leading to good cycle retention up to 3500 cycles when used as electrode material for supercapacitors. Highly permeable $SnO_2$ mixed biochar derived from banana peel exhibited maximum specific capacitance of $465F\;g^{-1}$ at a scan rate of $10mV\;s^{-1}$ by cyclic voltammetry (CV) and $476Fg^{-1}$ at current density of $0.15Ag^{-1}$ by charge discharge studies significantly higher about 47% than previously reported identical work on banana peel biochar.