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도로 융설체 개발을 위한 탄소나노튜브-시멘트 복합체 특성에 관한 실험적 연구
허진녕,박범진,김태형 한국도로학회 2013 한국도로학회논문집 Vol.15 No.2
PURPOSES : This study aims to review the possibility of developing a road snow-melting system that can prevent slip accidents by maintaining a constant temperature of the winter roads and enhance performance of structures, including improvement of compressive strength by mixing carbon nanotube (hereafter referred to as CNT) with cement paste, the basic material. METHODS: To achieve the above purpose, an experiment was conducted by mixing power-type CNT and wrap-type CNT up to cement paste formulation by weight of 0.0wt%~4.1wt% in accordance with “KS L ISO 679(of cement strength test method)”, and compressive strength was measured at 28 days of curing. In addition, the volume resistivity of the specimen was measured to test thermal and electrical characteristics, and the rate of temperature changes in specimen surface by power consumption was measured by passing electricity through the cross-sections of the specimen. Meanwhile, the criteria for checking the performance as a road snow-melting system was determined as volume resistivity of 100Ω·cm or less. RESULTS : A comparative analysis between specimen with 0wt% CNT content in plain status and specimen containing various types of CNTs was carried out. From its results, it was found that compressive strength increased approximately 19%, showing the highest rate when 0.2wt% of wrap-type CNT was contained, but volume resistivity of 100Ω·cm or less appeared only in specimens containing more than 0.2wt% CNT. In addition, it was observed that the surface temperature increased by 4.62℃ per minute on average in specimens containing 3.2wt% CNT. CONCLUSIONS : In this study, CNT was examined as an underlying material for a road snow-melting system, and the possibility of developing the road now-melting system was reviewed by conducting various experiments using CNT-Cement composites. From the experimental results, the specimens were found to have a superior performance when compared to the existing road snow-melting systems that place the heat transfer medium such as copper on the road. However, satisfactory strength performance were not obtained from the specimen containing CNT(2.0% or more) that functions as a heating element, which leads to the need for reviewing methods to increase the strength by using plasticizer or admixture.
딥러닝 모델을 활용한 포트홀 검출 및 성능 개선을 위한 전처리 방법론 연구
허진녕,이영인,김하영 한국지식정보기술학회 2023 한국지식정보기술학회 논문지 Vol.18 No.5
In recent years, the number of potholes has been increasing due to the high frequency of heavy rainfall. In addition, road surface damage is inevitable due to the aging of roads, and damaged roads (potholes and cracks) interfere with drivers' driving, causing various safety accidents. To efficiently solve this problem, various road damage detection studies have been conducted using artificial neural networks. However, previous studies have been limited by a lack of understanding of potholes. Furthermore, the need for research is growing as the number of risk factors that can cause potholes is rapidly increasing. To overcome the limitations of previous studies, this study proposes an image preprocessing technique that can effectively reflect the characteristics of potholes and an optimal structure for pothole detection based on EfficientDet. The proposed preprocessing technique combines two algorithms, CLAHE and Sobel Edge detection, to identify and learn potholes in road surface images by maximizing the boundaries of potholes through contour detection and contrast thresholding for the entire image, rather than solely relying on contrast. In addition, we designed the optimal number of BiFPN layers for the pothole dataset so that the module can clearly detect potholes. The methodology proposed in this study was applied to EfficientDet and YOLO v5 models to experimentally prove the feasibility of the methodology.
일본의 집단적자위권 논의에 관한 연구 -일본의 對美 동맹정책 변화를 중심으로-
허진녕 ( Jin Nyeong Heo ) 한일군사문화학회 2014 한일군사문화연구 Vol.17 No.-
일본은 집단적자위권의 “가지고 있지만, 사용할 수 없다”는 기존 입장을 “가지고 있고, 사용할 수 있다”로 변경을 추진하고 있다. 일본의 집단적자위권 행사는 동맹국 미국에 대한 강력한 군사적 지원을 약속하는 對美 동맹정책의 ‘발전적 보상정책’을 의미하며, 이는 미일동맹의 편무성을 극복하여 동맹국 미국과 대등한 관계로 방위협력을 구축한다는 일본의 의도를 엿볼 수 있다. 일본의 對美 동맹정책은 동맹국 미국에 대해 ‘명분형’ ‘실리형’ ‘수습형’ ‘발전형’ 등 다양한 보상 형태로 진행되었으며, 이러한 집단적자위권 행사 추진노력은 안보환경 변화에 대한 아베의 과욕적 인식과 실천적 의지를 바탕으로, 1970년대 일본이 데탕트의 국제환경 및 미국의 세계전략 변화 속에 추구하였던 적극적 보상 형태의 ‘발전형 보상정책’과 유사한 모습을 취하고 있다. 즉, 일본은 적극적인 위기인식과 보상 형태로 국·내의 법적 한계를 뛰어 넘어서라도 새로운 조약이나 협정을 만들어 미일동맹을 한 단계 더 안정적이고 성숙한 상태로 발전시키려 하고 있다. 하지만 일본의 집단적자위권 행사 논의는 평화헌법의 정신을 견지하면서 지역의 평화와 안정에 기여하고 과거 역사로부터 기인한 주변국들의 의구심과 우려를 해소하는 방향으로 투명하게 이루어져야 한다. 동맹국 미국도 한국을 포함한 주변국들의 우려를 야기하지 않게 투명하게 진행될 수 있도록 일본을 유인해야 할 것이다. It is that Japan is trying to switch Japan`s right of collective self-defense from "Japan has that, but can`t use" to "Japan has that, and can use." Useing right of collective self-defense means that promise powerful military support toward the U.S. which is ``type of developing compensation policy,`` it overcomes the U.S.-Japan`s imbalance. We can get a sense development of defense cooperation with balancing relationship in the U.S. However it`s not easy to take step of pushing ahead right of collective self-defense. The opposition partis including the ruling party are remaining cautious about altering constitution interpretation, and the Japanese not responded positively to the Japanese government suggestion. The argument of Japan`s right of collective self-defense should be transparently maded toward resolving surrounding nations concern and suspicion with sticking spirit of the Constitution`s Article 9. If the progress of Japan`s right of collective self-defense is going well, we eagerly expected to restrict the minimum required within the U.S.-Japan alliance`s framework.