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건설 프로젝트 자동화 기술개발 우선순위 도출을 위한 설문 분석
권우빈 ( Kwon¸ Woobin ),이창수 ( Lee¸ Changsu ),안희재 ( Ahn¸ Heejae ),김태훈 ( Kim¸ Taehoon ),조훈희 ( Cho¸ Hunhee ),강경인 ( Kang¸ Kyung-in ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
After the outbreak of COVID-19, the construction industry, which has more contact between workers than other industries, needs to improve its environment through the technology development for automation of construction projects. This study conducted 5-point scale surveys of 39 candidate technologies on 54 workers in construction- related industries to derive priorities for technology development to improve the construction environment. The result of this survey shows the top 10 candidate technology priorities, and this analysis can be used as basic data for setting the direction for future construction development.
Lifetime Assessment for Oil-Paper Insulation using Thermal and Electrical Multiple Degradation
Kim, Jeongtae,Kim, Woobin,Park, Hung-Sok,Kang, Ji-Won The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
In this paper, in order to investigate the lifetime of oil-paper insulation, specimens were artificially aged with thermal and electrical multiple stresses. Accelerated ageing factors and equivalent operating years for each aging temperatures were derived from results of tensile strengths for the aged paper specimens. Also, the evaluation for the multi-stress aged specimens were carried out through the measurement of impulse breakdown voltage at high temperature of $85^{\circ}C$. The lifetimes of the oil-paper insulations were calculated with the value of 66.7 for 1.0 mm thickness specimens and 69.7 for 1.25 mm thickness specimens throughout the analysis of impulse BD voltages using equivalent operating years, which means that dielectric strengths would not be severely decreased until the mechanical lifetime limit. Therefore, for the lifetime evaluation of the oil-paper insulation, thermal aging would be considered as a dominant factor whereas electrical degradation would be less effective.
Lifetime Assessment for Oil-Paper Insulation using Thermal and Electrical Multiple Degradation
Jeongtae Kim,Woobin Kim,Hung-Sok Park,Ji-Won Kang 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
In this paper, in order to investigate the lifetime of oil-paper insulation, specimens were artificially aged with thermal and electrical multiple stresses. Accelerated ageing factors and equivalent operating years for each aging temperatures were derived from results of tensile strengths for the aged paper specimens. Also, the evaluation for the multi-stress aged specimens were carried out through the measurement of impulse breakdown voltage at high temperature of 85℃. The lifetimes of the oil-paper insulations were calculated with the value of 66.7 for 1.0 mm thickness specimens and 69.7 for 1.25 mm thickness specimens throughout the analysis of impulse BD voltages using equivalent operating years, which means that dielectric strengths would not be severely decreased until the mechanical lifetime limit. Therefore, for the lifetime evaluation of the oil-paper insulation, thermal aging would be considered as a dominant factor whereas electrical degradation would be less effective.
Lee, Woobin,Kim, Jiwan,Kim, Yong-Hoon ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.723 No.-
<P><B>Abstract</B></P> <P>In this paper, we report high-mobility InO<SUB>x</SUB>/GaO<SUB>x</SUB> bilayer channel thin-film transistors (TFTs) fabricated using the persistent high-surface-energy characteristic of photochemically activated metal-oxide films. The photochemically-activated metal-oxide films exhibited persistent high surface-energy characteristics compared to a thermally annealed film, which enabled the facile vertical stacking of oxide films using a solution-based process. By using the photochemical activation process as an annealing method and by employing an InO<SUB>x</SUB>/GaO<SUB>x</SUB> bilayer channel structure, high-mobility oxide TFTs with saturation field-effect mobilities as high as 15.7 cm<SUP>2</SUP>/V-s were obtained with an average value of 11.2 ± 1.9 cm<SUP>2</SUP>/V-s. Various spectroscopic and surface analyses were performed to elucidate the persistent high surface-energy behavior and the dynamic changes in surface states.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Photochemically-activated oxide films exhibit persistent high surface-energy characteristics. </LI> <LI> High-mobility InO<SUB>x</SUB>/GaO<SUB>x</SUB> bilayer channel thin-film transistors are fabricated. </LI> <LI> The high surface-energy enabled facile stacking of oxide films using a solution process. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>