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SiC/Al<sub>2</sub>O<sub>3</sub>/Vinyl-Ester 복합재료의 강화재 입자가 기계적 특성 및 파괴거동에 미치는 영향
김다진솔 ( Da Jin Sol Kim ),윤유성 ( Yu Seong Yun ),권오헌 ( Oh Heon Kwon ) 한국안전학회 2017 한국안전학회지 Vol.32 No.3
Particle reinforced composites are materials that have enhanced physical properties by adding particle reinforcements to polymer materials and have been applied to a wide range of fields such as the aerospace, bio-technology and automative industry. In this study, particle reinforced composites were prepared by mixing SiC/Al<sub>2</sub>O<sub>3</sub> to the vinyl ester as the thermoset resin. The purpose of this study is to evaluate mechanical properties and fracture behavior by the tensile test and single edge notch specimen according to the addition ratio of reinforcement. Addition of 1 and 2 wt% of the particle reinforcement to the vinyl-ester resin was effective for the strength improvement. However, when it was more than 3 wt%, its strength was decreased. Also the highest elastic modulus obtained as 3.19 GPa was found at the 2 wt% addition of reinforcement. Futhermore the fracture toughness was evaluated by the energy release rate and the maximum critical energy release rate was obtained when 1 wt% reinforcement. The results show that the limit of adding of SiC/Al<sub>2</sub>O<sub>3</sub> for improvement of the mechanical and fracture performance is 2 wt% reinforcement particles.
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드론과 지상 LiDAR를 이용한 급경사지 재해위험성 평가·분석
김성삼(Kim, Seong Sam),김다진솔(Kim, DaJinSol),신동윤(Shin, Dong Yoon),노현주(Nho, Hyun Ju) 대한공간정보학회 2020 대한공간정보학회지 Vol.28 No.4
최근 기후변화로 인한 이상기후로 인해 홍수, 산사태, 토사 유출과 같은 자연재난의 피해가 급증하고 있다. 우리나라는 국토의 63% 이상이 산지라는 지형적 특성 때문에 사면 재해에 매우 취약해 여름철 집중호우로 많은 피해가 발생하고 있다. 본 논문은 드론맵핑과 지상 light detection and ranging(LiDAR) 측량을 활용한 급경사지 위험성 현장조사·평가 적용성에 관한 연구로서 이를 위해 소형 상업드론으로 대상 사면과 주변의 드론 영상을 취득하고 지상기준점 측량을 수행한 후 드론맵핑을 수행하였다. 또한, 급경사지 크랙 길이, 기반암 풍화상태 등 상세한 지질특성 자료 수집과 정량적인 위험도 정도를 판단하기 위하여 대상 사면을 대상으로 지상 LiDAR 측량을 병행하였다. 결론적으로 드론맵핑과 지상 LiDAR 측량성과를 활용하여 간이식 계측장비와 육안 현장조사에 의존하던 기존 방식에 비해 정량적이고 종합적으로 급경사지 재해위험성을 평가하는 개선방안을 제시하였다. With frequent abnormal weather cause by the recent climate change, the natural disaster-derived damages such as flooding and runoff water, landslide, and debris flow have been increased every year. Korea is known as to be very vulnerable with landslide disasters because more than 63% of the country is mountainous and it suffers from unpredictable localized heavy rainfalls during monsoon season. This paper presents the applicability for field survey and the risk assessment of steep slope using drone mapping and terrestrial LiDAR survey. For the purpose of this study, we firstly acquired the aerial imagery of steep slope site by small UAVs and conducted ground control points surveying using RTK-GNSS and then drone mapping process. In order to collect more detailed geological data and analyze quantitatively damage of steep slopes (crack length and bedrock weathering status etc.), we scanned steep slope area using terrestrial LiDAR system. In conclusion, we suggested an advanced approach for evaluate comprehensively and quantitatively the risk of steep slope with outputs of UAV photogrammetry and 3D point clouds derived from terrestrial LiDAR data, comparing with a conventional approach which depended on simple observation equipment and visual inspection.
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CFRP/GFRP 적층복합재의 두께가혼합모드 균열거동과 AE에 미치는 영향
윤유성 ( Yu Seong Yun ),김다진솔 ( Da Jin Sol Kim ),권오헌 ( Oh Heon Kwon ) 한국안전학회(구 한국산업안전학회) 2014 한국안전학회지 Vol.29 No.6
Recently many efforts and researches have been done to cope with industrial facilities that require a low energy machines due to the gradual depletion of the natural resources. The fiber-reinforced composite materials in general have good properties and have the proper mechanical properties according to the change of the ply sequences and fiber distribution types. However, in the fiber-reinforced composite material, there are several problems, including fiber breaking, peeling, layer lamination, fiber cracking that can not be seen from the metallic material. Particularly, the fracture and delamination are likely to be affected by the thickness of the stacking laminates when the bi-material laminated structure is subjected to a load of the mixed mode. In this study, we investigated the effect of the thickness ratio of the difference in the CFRP/GFRP bi-material laminate composites by measuring the cracking behavior and the AE characteristics in a mixed mode loading, which may be generated in the actual structure. The results show that the thickness of the CFRP becomes more thick, the mode I energy release rate becomes a larger, and also the influence of mode I is greater than that of mode II. In addition, A Eamplitude which shows the level of the damage in the structure was obtained the more damage in the CFRP with the thin thickness.
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김세준 ( Se-jun Kim ),최종필 ( Jong-pil Choi ),오동현 ( Dong-huyn Oh ),김다진솔 ( Da-jin-sol Kim ) 한국항행학회 2023 韓國航行學會論文誌 Vol.27 No.6
본 연구는 드론의 통신상태 안정화 및 통신거리 확장을 위하여 위성시스템을 활용한 안테나 트래커 시스템 개발을 제시한다. 지상국과 드론 간의 일반적인 고정형 안테나 방식에서 통신 이득을 최대화 하고자 드론과 지상국의 위치정보를 이용하여 자동으로 지상국의 안테나가 드론을 지속적으로 지향할 수 있는 트래커시스템을 개발하였다. 안테나 트래커를 활용하여 통신 상태 안정화를 개선하고 통신거리를 확장함으로써 드론산업 고도화를 가져올 수 있을 것으로 기대된다. This study proposes the development of an antenna tracker system using a satellite system to stabilize the communication status of drones and extend the communication distance. The location information of the drone and the ground station was used to maximize communication gain in the general fixed antenna method between the ground station and the drone. We developed a tracker system that can automatically and continuously aim the ground station's antenna at the drone. It is expected that the use of antenna trackers will improve the stabilization of communication conditions and expand the communication distance, thereby leading to the advancement of the drone industry.
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