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서경원(Kyong-Won Seo),백기현(Ki-Hyun Baek),김영진(Young-Jin Kim),곽도연(Do-Yeon Kwak) 한국콘크리트학회 2009 콘크리트학회지 Vol.21 No.1
본 연구에서는 초고강도 콘크리트의 자기수축 제어대책으로서 팽창재를 이용하는 경우의 적절한 첨가량 및 유효성에 대하여 확인하였고, 재팽창 현상에 대해서 검토하였다. 그 결과 물시벤트비가 극히 낮은 초고강도 콘크리트의 특성상 과첨가의 경우는 미반응의 팽창재가 잔존하고 재팽창 할 가능성이 있는 것으로 나타났으며 초고강도 콘크리트용의 팽창재로서는 가능한 미수화 팽창재가 잔존하지 않는 팽창재 즉 팽창성능을 충분히 가지면서 수화반응이 빠른 조강성의 비표면적이 큰 팽창재가 바람직한 것을 제안하고 있다.
C-축 배향된 ZnO 박막을 이용하여 제작한 압전형 마이크로 스피커의 특성 평가
이승환,서경원,유금표,권순용,Yi Seung-Hwan,Seo Kyong-Won,Ryu Kum-Pyo,Kweon Soon-Young 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.6
A micromachined piezoelectric microspeaker was fabricated with a highly c-axis oriented ZnO thin film on a silicon-nitride film having compressive residual stress. When it was measured 3 mm away from the microspeaker in open field, the largest sound pressure level produced by the fabricated microspeaker was about 91 dB at around 2.9 kHz for the applied voltage of $6\;V_{peak-to-peak}$. The key technologies to these successful results were as follows: (1) the usage of a wrinkled diaphragm caused by the high compressive residual stress of silicon-nitride thin film, (2) the usage of the highly c-axis oriented ZnO thin film.
터널 정보관리 시스템과 터널 붕락 예측 시스템 적용성 연구
마상준(Sang-Joon Ma),서경원(Kyong-Won Seo) 한국철도학회 2002 철도저널 Vol.5 No.2
For an efficient management and analysis of geological/geotechnical data obtained during site investigations or tunnel construction, Tunnel Information System(TIS) was developed in this study. TIS is running in GIS(Geographical Information System) which has a spatial data. TIS consists of two parts, the Tunnel Face Mapping System(FaceMap), to record a geological features by observations and measurements at the surface of the excavation, the Borehole Data Management System(BDMS), to store the different types of rock data related to boreholes. Using the database of collapsed tunnels, 20 in Korea and 84 in Europe and with an artificial neural network, an expert system was developed for inferring the tunnel collapse pattern and its volume. And by applying Geo-predict, the system developed, in tunnels under construction, observed data from the ○○tunnl site was compared and analyzed.
COVID-19에 따른 비대면 수업이 청소년의 건강관련체력 및 균형감각에 미치는 영향
이광진 ( Kwang-jin Lee ),서경원 ( Kyong-won Seo ),안근옥 ( Keun-ok An ) 한국운동생리학회(구 한국운동과학회) 2021 운동과학 Vol.30 No.2
PURPOSE: This study aimed to examine the effects of non-face-to-face learning on health-related physical fitness and balance in adolescents according to the coronavirus disease 2019 (COVID-19). METHODS: Twenty-nine middle-school students (14 girls and 15 boys) were enrolled. We measured the students’ health-related physical fitness (body composition, muscle strength, muscle endurance, flexibility, and cardiac endurance) and balance (static and dynamic) before and after 12 weeks of non-face-to-face learning without any exercise intervention. Cardiac endurance was measured using the Harvard step test. RESULTS: Body fat, muscle strength (hip flexion, hip extension, knee flexion, knee extension), and Y-balance test exhibited significant differences before and after non-face-to-face learning (p<.05). Body fat, muscle strength (hip flexion, hip extension), and Y-Balance test exhibited significant differences in the female group (p<.05). Hip extension muscle strength exhibited a significant difference in the male group (p<.05). Analysis of covariance showed that muscle strength (hip extension and knee extension) and Harvard step of the female group were significantly decreased compared to the male group (p<.05). CONCLUSIONS: Non-face-to-face classes according to COVID-19 had a negative effect on health-related physical fitness and balance in adolescents. Particularly, the muscle strength and cardiac endurance of female adolescents were lower than those of male adolescents.