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지하구조물에 있어서 강아치 지보공의 비파괴 응력계측에 관한 기초적 연구
곽기봉(Ki-Bong Kwak),이재호(Jae-Ho Lee),아쿠타가와 신니치(Akutagawa Shinichi),김영수(Young-Su Kim),권외덕(Wea-Dock Kwon) 한국토목섬유학회 2009 한국토목섬유학회 학술발표회 Vol.2009 No.11
본 연구에서는 새로운 비파괴 응력계측수법으로 주목을 받고 있는 자기이방성센서 측정 장치를 이용하여 터널굴착에 따른 강아치 지보공의 응력거동을 분석해 보았다. 자기이방성센서 응력측정방법은 철 등의 강자성체의 자기특성이 변형에 의존하는 것을 이용하여 강재표면의 절대응력을 구하는 방법이다. 본 연구에서는 자기이방성 응력측정법에 의한 계측과 변위계측 결과를 이용하여 단층부근을 지나가는 지반과 지보구조물의 변형과 응력 거동의 특성을 규명해보았다.
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유지형,곽기봉,김대성 한국도로학회 2015 한국도로학회논문집 Vol.17 No.6
PURPOSES: This study intends to develop an inorganic soil pavement material using industrial by-products and to evaluate its applicability as a road pavement material. METHODS: In this study, a compressive strength experiment was conducted based on the NaOH solution molarity and water glass content to understand the strength properties of the soil pavement material according to the mixing ratio of alkali activator. In addition, the strength characteristic of the inorganic soil pavement material was analyzed based on the binder content. The performance of the soil pavement was evaluated by conducing an accelerated pavement test and a falling weight deflectometer (FWD) test. RESULTS: As a result of the soil pavement material test based on the mixture ratio of alkali activator, it was identified that the activator that mixed a 10 M NaOH solution to water glass in a 5:5 ratio is appropriate. As a result of the inorganic soil pavement materials test based on the binder content, the strength development increased sharply when the amount of added binder was over 300 kg; this level of binder content satisfied 28 days of 18 MPa of compression strength, which is the standard for existing soil pavement design. According to the measured results of the FWD test, the dynamic k-value did not show a significant difference before or after the accelerated pavement testing. Furthermore, the effective modulus decreased by approximately 50%, compared with the initial effective modulus for pedestrian pavement. CONCLUSIONS: Based on these results, inorganic soil pavement can be applied by changing the mixture proportions according to the use of the pavement, and can be utilized as road pavement from light load roads to access roads.
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자기력을 이용한 비접촉 6자유도 미소위치결정 기구의 개발-설계, 모델링 및 제어-
최기봉,박기환,김수현,곽윤근,Choi, Kee-Bong,Park, Kyi-Hwan,Kim, Soo-Hyun,Kwak, Yoon-Keun 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.4
A magnetically levitated micro-positioner is implemented to avoid mechanical friction and increase precision. Since magnetic levitation system is inherently unstable, most concern is focused on a magnetic circuit design to increase the system dynamic stability. For this, the proposed levitation system is constructed by using an antagonistic structure which permits a simple design and robust stability. From the dynamic equations of motion, it is verified that the proposed magnetically levitated system is decoupled in 6 degree-of-freedom motion. Experimental results are presented in terms of time response and accuracy.
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