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Mock-up 실험에 의한 CFT 충전용 초고강도 콘크리트 특성 평가에 관한 연구
김창율(Kim Chang-Yool),임남기(Lim Nam-Gi),조현준(Cho Hyun-Jun),정상진(Jung Sang-Jin),김성덕(Kim Seong-Deok),이영도(Lee Young-Do) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.9
The Concrete Filled Steel Tube (CFT) structure provides the advantages of steel and concrete, including excellent strain performance, low labor cost and short term of works, but has hardly been applied to actual structures in Korea. In the CFT structure, the concrete filling cannot be visually checked, and pores may exist under the diaphragm. Accordingly, it has problems in ensuring the quality and workability. Therefore, a test was conducted with the 80㎫ and 100㎫ ultra-high strength concrete cast to the 400×400㎜ steel tube via top casting method, and the following test results were obtained. The fluidity (690㎜ for 80㎫ and 685㎜ for 100㎫) and air volume (2.1% and 2.3%, respectively) met the desired values, and the settlement was below the desired standard of 2 ㎜. The strength achieved at the initial aging was more than 50% for each desired strength, and was the highest in the standard water curing. As for the core strength, the strength reinforcement was low at the center of the member with a diaphragm, and the strength was higher at the lower part than at the upper part. For each desired strength, the temperature difference between the surface and center was 10℃ or less, and the contraction was lower at 80㎫ than at 100㎫.
길경석,송재용,문승보,이경수,김창율,Song Jae-yong,Moon Seung-bo,kil Gyung-suk,Lee Gyung-soo,Kim Chang-yul 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.4
본 논문에서는 전력선 통신과 조광 기술을 기반으로 에너지 절약과 적정 조도의 제어가 가능한 조명제어 스위치의 개발에 대하여 기술하였다. 개발된 스위치는 범용의 마이크로프로세서와 주변 전자기술을 이용하며, 하나의 마이크로프로세서로 전력선 통신과 조광기능을 구현함으로서 저가격 상용화가 가능하였다. 캐리어 주파수는 전송 데이터 길이와 신호감쇄를 고려하여 250kHz로 설정하였다. 저압선로에서 시제작품에 대한 시험결과, 본 스위치는 전력선의 길이와 부하용량의 변동에 대해 강인하게 동작하는 것을 확인하였다. Lighting control switches based on the power line communication technology are developed and extended to incorporate dimming control to provide energy saving and appropriate illumination. The developed switch uses a general purpose microprocessor and associated electronics. Both the power line communication and the dimming function are implemented in one microprocessor, and it enables the low price commercialization. The frequency of the carrier was set at 250kHz considering the transmission data length and signal attenuation in power lines. Tests on prototypes in an low-voltage power lines have shown that the switches have a robust operation characteristics with the length of power lines and the variation of load capacities.
근거리 사진측량의 3차원 위치결정에 있어서 과대오차탐색에 관한 연구
고복영,김창율 부천대학 1993 論文集 Vol.14 No.-
In the adjustment of photogrammetric observations by least squares method, gross error are regarded as random error and are distributed evenly to all observations The object of the study are the detect gross error easily and to eliminate gross error, and by introducing of additional parameter upgrade the accuracy of bundle adjustment, this is accomplished in this paper by introducing a sequential data-snooping method. A theory of adjustment of observations which eliminates gross error is derived by algorithm of sequential data-snooping is applied to bundle adjustment which self calibration, as it is very effective to detect gross errors of observation values.