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Yang, Myung,Kim, Dai-Hong,Kim, Won-Sik,Kang, Tae June,Lee, Byung Yang,Hong, Seunghun,Kim, Yong Hyup,Hong, Seong-Hyeon IOP Pub 2010 Nanotechnology Vol.21 No.21
<P>SnO<SUB>2</SUB> nanoparticle coated single wall nanotube (SWNT) network sensors were fabricated by forming a SWNT network on the Pt patterned SiO<SUB>2</SUB><I>/</I>Si substrate using a dip coating method and subsequently depositing SnO<SUB>2</SUB> nanoparticles on the SWNT network by rf magnetron sputtering. Their H<SUB>2</SUB> gas sensing properties were investigated. The SnO<SUB>2</SUB>–SWNT network sensors stably and reversibly responded to H<SUB>2</SUB> gas even at room temperature and could detect H<SUB>2</SUB> gas down to 100 ppm. In addition to the low temperature detection, a remarkable finding was that the gas sensing behavior of SnO<SUB>2</SUB>–SWNT network sensors was changed from p-type to n-type with increasing SnO<SUB>2</SUB> deposition time (i.e. surface coverage of SnO<SUB>2</SUB> on SWNT). A schematic model was proposed to explain the switching of sensing behavior depending on the surface coverage of SnO<SUB>2</SUB> nanoparticles on the SWNTs. </P>
Seonguk Hong,Seunghun Kim 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.7
Among fiber-reinforced composites, steel fiber has been widely-used for concrete infrastructure such as silos, tunnels, specifically aiming at reducing the weight of concrete and enhancing its strength by overcoming the brittleness. However, there is still little known about appropriate quality management and applicability assessment for steel fiber composites. This study fills this knowledge gap by testing the possibility of maintenance through steel fiber concrete thickness estimation and assessing the applicability of the quality management instrument. To this end, this study utilizes two different stress wave-driven non-destructive test methods: ultrasonic pulse velocity and impact-echo methods. The ultrasonic pulse velocity method was employed to estimate the compressive strength of steel fiber reinforced concrete, while the impact-echo method was applied to estimate the thickness of various steel fiber reinforced concrete members. As a quality management factor of concrete, correlations between steel fiber mixing ratios and compressive strengths were experimentally explored and validated by error ratios for twenty-four specimens. The reliability was relatively high overall. The average error rate of all the specimens with steel fiber mixing ratios of 0, 0.75 and 1% was 3.36%. Accordingly, the results prove the applicability of the non-destructive test methods for building quality management.
배승훈(Seunghun Bae),서정환(Jeonghwan Seo),홍승재(Seungjae Hong),김동환(Donghwan Kim),정동원(Dongwon Jeong) 한국정보기술학회 2018 Proceedings of KIIT Conference Vol.2018 No.11
논문에서는 공간의 제약성을 해결하기 위한 새로운 자전거 대여 시스템을 제안한다. 최근 급속한 경제 발전으로 인한 환경, 교통 문제를 해결할 수 있는 방안으로 자전거 대여 시스템에 관한 연구가 진행되고 있다. 하지만 현재 운용되고 있는 많은 자전거 대여 시스템들은 지정된 공간에서 대여 및 반납이 이루어져야 하는 공간의 제약성을 지니며 이로 인한 서비스 이용이 제한되는 문제점을 지닌다. 따라서 이 논문에서는 이러한 공간의 제약성을 해결하고 활용성을 높이기 위한 어느 공간에도 자유롭게 반납할 수 있는 시스템을 제안한다.
Seonguk Hong,Yongtaeg Lee,Seunghun Kim,Changsik Lee 대한건축학회 2016 Architectural research Vol.18 No.4
The structure must be periodically checked and measures must be taken to prevent deterioration in building construction. From this point of view, a nondestructive test is essential to estimate whether the construction of buildings is proper, and whether the dimension of depositing concrete is consistent and without damage. This study estimated the thickness of the concrete component of construction framework using the ultrasonic velocity method and the impact echo method, in order to investigate reliability of the estimation of the thickness of normal strength concrete and high strength concrete, leading to the following conclusions. In the estimation of the thickness of the concrete structures, specimens of normal strength of 24MPa and specimens of high strength of 40MPa demonstrated an average error rate of 5.1% and 2.2%, respectively. The impact-echo method, one of the non-destructive tests, is verified as an efficient diagnostic technique. With this information, we will determine specific standards for the maintenance of structures, and the re-creation of lost building blueprints.