• Electrical & Electronic Materials
• /
• v.5 no.2
• /
• pp.166-174
• /
• 1992

본 논문에서는 열자격 전류 기법을 이용하여 폴리비닐덴 후로라이드필름에 대한 하전 입자의 거동 상황을 살펴보았는데 결과로 .betha.2, .betha.1, .alpha. 그리고 .alpha.'의 4개의 피크가 -35[.deg.C], -10[.deg.C], 60[.deg.C], 그리고 85[.deg.C]부근의 온도에서 관측되었다. 처음 .betha.2 피크와 .betha.1 피크에서의 온도는 항상 일정하였고 .alpha. 피크와 .alpha.'피크는 형성온도에 의존하였다. .betha.2 피크와 .betha.1 피크의 기원은 쌍극자의 기여로 .alpha. 피크는 결정질 영역의 얕게 트랩된 하전 입자의 탈트랩으로 그리고 .alpha.'피크는 형성온도에 따라 발생되는 Langmurian Model과 Henry Model에 의하여 나타났다. 이러한 해석을 위해 분리된 단일 완화곡선에 점근해법에 의한 수치해석 기법을 적용함으로서 사용시료의 제정수에 대한 계산을 보다 정확하게 구할수 있었으며 특히 적분항에 대한 계산오차가 감소함을 확인하였다.

• Electrical & Electronic Materials
• /
• v.7 no.5
• /
• pp.383-388
• /
• 1994

Deep levels in semi-insulating GaAs were observed by thermally stimulated current(TSC) measurement In the temperature ranges of 100-300K Tl(E$\_$c/-0.18eV), T2(E$\_$c/-0.20eV), T3(E$\_$c/-0.31eV), T4(E$\_$c/-0.40eV), and T5(E$\_$c/-O.43eV) traps have been observed. The TI, T2, and T5 traps seem to be related to the V$\_$As/, V$\_$Ga/-complex, and As$\_$Ga/$\^$++/ respectively. T4 trap is considered with respect to V$\_$Ga/-V$\_$As/ complex.

• Proceedings of the KIEE Conference
• /
• 2003.07c
• /
• pp.1481-1483
• /
• 2003

Molecular motions of polyaniline conducting blends were prepared. Surface resistance of its blends was investigated by a Surface Resistance Meter. DC electrical properties were investigated by Thermally Stimulated Currents(TSC) method and AC dielectric properties were investigated by Dielectric Thermal Analyzer (DETA) in the temperature range from $-50^{\circ}C$ to $120^{\circ}C$ at 1E0 Hz $^{\sim}$ 1E7 Hz for a comparative study of molecular relaxation. Using Scanning Electron Microscopy(SEM), relations of both microstructure and conduction behaviors was observed.

• Journal of the Korean Society of Safety
• /
• v.18 no.3
• /
• pp.60-63
• /
• 2003

For the increase the charge stability of teflon electrets for used at uncomfortable industrial circumstances with high temperature or humidity, We made an investigation into double layer effect of teflon electrets. Teflon AF film was spincoated on FEP film and then the charge storage property of AF/FEP dual film was investigated to be compared with FEP film. It was found that the AF/FEP dual film has higher surface potential than FEP film on the repeated charging and annealing process. It seems that AF/FEP dual film has higher thermal stability than FEP film through TSC measurement. If the investigations of the double layer effect of Teflon film carried out more closely with it's molecular structures and surface conditions, it may be effectively improved the stability of charge storage.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.6 no.6
• /
• pp.23-31
• /
• 1992

Charged particle in the polymers is supposed to affect the electrical conduction and to lead them th dielectrical breakdown finally. So we measured the space charge distribution made by application of high electric field and evaluated the polarity of the charged particle affected on electrical conduction and space charge formed in the insulating materials by using temperature gradient thermally stimulated current measurement method(TG-TSC measurement). As a result, in the cross-linked polyethylene, A-peak was caused from dipole polarization, C-peak was caused from ionic space charge polarization and D-peak was injected trap hole. Also we found it crossible the evaluated the polarity of injected trap carrier and electron(or hole) of carrier trap in the cross-lined polyethylene. We found that ${\gamma}$-ray irradiated low density polyethylene had a relation to the electronic trap and we also could get the value of electric field distribution in the samples of which evaluation was available.

• Journal of Korean Society of Environmental Engineers
• /
• v.32 no.11
• /
• pp.1001-1010
• /
• 2010

The purpose of this study is to investigate the concentration levels of particle materials ($PM_{10}$, asbestos), gas materials ($CO_2$, CO, $NO_2$, HCHO, Rn, VOCs) and total suspended colony (TSC), and the correlations among these materials in indoor air quality of 54 multiple-use facilities and 15 public-use facilities of Gwangju. The highest mean concentration of $PM_{10}$ was $69.2\;{\mu}g/m^3$ at indoor parking place, followed by childcare facilities, large commercial building and subway station building. The highest mean concentration of CO was 2.7 ppm at indoor parking place and that of $CO_2$ was 604.1 ppm at medical service facilities. The highest mean concentration of $NO_2$ was 0.036 ppm at indoor parking place. The geomean concentration of HCHO was $3.6\;{\mu}g/m^3$ in all facilities and the highest was $631.8\;{\mu}g/m^3$ at art gallery. The geomean concentration of VOCs (5 species) was $24.14\;{\mu}g/m^3$ in all facilities and toluene was the highest material of $15.30\;{\mu}g/m^3$, followed by xylene, ethylbenzene, benzene and styrene. The highest mean concentration of TSC was $625.3\;CFU/m^3$ at jjimjilbang, followed by childcare facilities, medical service facilities and large commercial building. The highest of asbestos was 0.0072 each/cc at childcare facilities and that of radon was 1.41 pCi/L at art gallery. PM10 showed positive correlations to TSC with $R^2\0.5332$ by lognormal equation at childcare facilities. CO2 showed positive correlations to CO at childcare facilities and indoor parking place. Lognormal equation fitted to the VOCs data more than normal equation in all facilities.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.22 no.3
• /
• pp.679-687
• /
• 2021

The purpose of the present study was to document the standardization and management process of interface terminology regarding the chief complaints, diagnoses, and procedures, including surgery in a four-hospital consortium. The process was proposed, discussed, modified, and finalized in 2016 by the Terminology Standardization Committee (TSC), consisting of personnel from four hospitals. A request regarding interface terminology was classified into one of four categories: 1) registration of a new term, 2) revision, 3) deleting an old term and registering a new term, and 4) deletion. A request was processed in the following order: 1) collecting testimonies from related departments and 2) voting by the TSC. At least five out of the seven possible members of the voting pool need to approve of it. Mapping to the reference terminology was performed by three independent medical information managers. All processes were performed online, and the voting and mapping results were collected automatically. This process made the decision-making process clear and fast. In addition, this made users receptive to the decision of the TSC. In the 16 months after the process was adopted, there were 126 new terms registered, 131 revisions, 40 deletions of an old term and the registration of a new term, and 1235 deletions.

• Journal of The Korean Society of Grassland and Forage Science
• /
• v.11 no.4
• /
• pp.203-208
• /
• 1991

This experiment was carried out to compare the effects of summer temperature and nitrogen application on carbohydrates and fiber contents in orchardrass stubble grown in the cool summer year, 1980 and in the hot summer year, 1984. For this study, the contents of carbohydrates, neutral detergent fiber (NDF), acid detergent fiber(ADF) and hemicellulose in orchardgrass stubble were investigated. 1. Total water soluble carbohydrates(TSC) in orchardrass stubble were accumulated during the period of cool season and were declined when the weather was hot and dry. The reserve level of those were decreased when a new leaf emerged after the start of plant growth and then were increased as the plant was in full flourish. 2. The reserve of carbohydrate content in orchardgrass stubble was about twice times higher in cool summer year than that in hot summer year, and the reserve rate of carbohydrates showed to be fast in cool summer year. When the nitrogen fertilizer applied, the content of TSC in orchardgrass stubble more lowered but not significantly different(p<0.05). 3. The contents of NDF, ADF and hemicellulose in orchardgrass stubble in cool summer year were not significantly different from those in hot summer year. These contents showed also no significant difference among different levels of nitrogen applications. 4. The relationship of carbohydrate, NDF, ADF and hemicelluose contents according to the levels of nitrogen applications were negatively correlated in cool summer year. But there was no consistency in hot summer year.

• Steel and Composite Structures
• /
• v.23 no.5
• /
• pp.557-570
• /
• 2017

In this study, the seismic performance levels of four bridges are determined using finite element modeling based on ambient vibration testing. The study includes finite element modeling, analytical modal analyses, ambient vibration testing and earthquake analyses of the bridges. For the purpose, four prestressed precast I beam bridges that were constructed for the Ankara-Sivas high speed railway line are selected for analytical and experimental studies. In the study, firstly a literature review related to the dynamic behavior of bridges especially precast beam bridges is given and then the formulation part related to ambient vibration testing and structural performance according to Turkish Seismic Code (2007) is presented. Next, 3D finite element models of the bridge are described and modeled using LARSA 4D software, and analytical dynamic characteristics are obtained. Then ambient vibration testing conducted on the bridges under natural excitations and experimental natural frequencies are estimated. Lastly, time history analyses of the bridges under the 1999 Kocaeli, 1992 Erzincan, and 1999 Duzce Earthquakes are performed and seismic performance levels according to TSC2007 are determined. The results show that the damage on the bridges is all under the minimum damage limit which is in the minimum damage region under all three earthquakes.

• KDI Journal of Economic Policy
• /
• v.15 no.3
• /
• pp.3-36
• /
• 1993

1990년대 중반기간(中盤期間)은 남한(南韓) 내부(內部)의 경제선진화(經濟先進化)와 정치(政治) 사회(社會)의 지속적(持續的) 발전여부(發展與否)가 판가름되는 중요한 시기이며, 민족(民族) 전체적(全體的)으로는 남북한간(南北韓間) 민족공동체(民族共同體)의 형성(形成)과 통일(統一)의 실현(實現) 가능성(可能性)이 결정되는 중요한 시기(時期)가 될 것이다. 따라서 민족경제공동체(民族經濟共同體) 형성(形成)을 위한 남한(南韓)의 확고한 대북한(對北韓) 경제정책(經濟政策) 수립(樹立)은 물론 남북한간(南北韓間)의 경제관계(經濟關係) 또한 단기적(短期的) 상업적(商業的) 이익(利益)보다는 장기적(長期的) 관점(觀點)에서 "통일한국(統一韓國)"의 국제경쟁력(國際競爭力)을 제고하고 통일민족(統一民族)의 경제적(經濟的) 복리(福利)를 극대화(極大化)하는 것이어야 한다. 본고(本稿)에서는 최근(最近) 북한(北韓)의 대서방(對西方) 외자유치노력(外資誘致努力) 및 무역확대정책(貿易擴大政策) 등 개방화(開放化) 정책(政策)의 현황(現況)과 문제점(問題點)을 검토한 후, 향후 "남북기본합의서(南北基本合意書)"의 내용(內容)이 구체적(具體的)으로 실현되고, 특히 남북한간(南北韓間) 직교역(直交易)이 정착될 경우 남북한간(南北韓間) 교역확대(交易擴大)와 합작투자(合作投資)를 비롯한 경협(經協)이 급전전될 것으로 예상되므로 남북한(南北韓)의 대(對)OECD 무역자료(貿易資料) 분석(分析)을 통혜 얻은 현시비교우위지수(顯示比較優位指數)(RCA)와 무역특화지수(貿易特化指數)(TSC)를 이용, 남북한간(南北韓間) 교역(交易) 및 경협(經協) 확대(擴大) 발전(發展)의 일환으로서 남북한간(南北韓間) 교역가능품목(交易可能品目) 및 경협유망분야(經協有望分野)를 선정 제시하였다.