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레이저 유도 플라즈마 분광분석법을 적용한 금속표면의 부식 특성에 관한 연구
강동찬(Dongchan Kang),김주한(Joohan Kim) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.1
The corrosion of metal specimens was analyzed in this study using laser-induced breakdown spectroscopy. The samples used in the study were magnesium alloys and corrosion, and standard specimens were prepared and analyzed using surface and depth analysis. The spectral wavelengths used in the oxide layer analysis were 777.196 nm, 777.421 nm, and 777.543 nm. The spectral line of the surface corrosion was confirmed by experimentation, and surface micro morphology analysis was performed using an optical microscope. Approximately 100 μm corrosion depth was confirmed via laser irradiation in the depth direction. The results of laser-induced breakdown spectroscopy and the SEM-EDS analysis were compared and analyzed.
Dense Retrieval을 이용한 한국어 FAQ Retrieval
강동찬(Dong-Chan Kang),나승훈(Seung-Hoon Na),김태형(Tae-Hyeong Kim),최윤수(Yun-Su Choi),장두성(Du-Seong Chang) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.6
FAQ Retrieval은 유저 쿼리에 대응하는 (질문, 정답) 쌍들을 FAQ 컬렉션으로부터 검색결과로 가져오는 태스크이다. FAQ Retrieval에서의 검색 시스템은 유저 쿼리에 적절히 대응하기 위해 유저 쿼리와 컬렉션 내의 (질문, 답) 쌍 간에 존재하는 어휘적인 차이(Lexical gap)를 반영할 수 있어야 한다. 본 논문에서는 이 점을 고려하여 Dense retrieval를 한국어 FAQ retrieval태스크에 적용하여 성능을 평가하고, 기존의 키워드 기반 검색 엔진 적용 후 Reranking을 적용한 방식과 비교한다.
레이저 플라즈마 분광분석법을 이용한 표면처리 된 마그네슘 합금 표면의 경도 분석
강동찬(Dongchan Kang),김주한(Joohan Kim) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.6
The hardness of surface treated magnesium alloy was evaluated using laser induced breakdown spectroscopy. The surface of the specimen was hardened mechanically, and the hardness profiles were measured using a traditional measurement technique. A laser beam was irradiated to generate a plasma, and the peaks of the components of the specimen were analyzed. A wavelength of 333.66 nm and 293.65 nm were selected as the atomic and ionic peaks, respectively. The ratios of the ionic peak to the atomic peak were obtained so as to compare the hardness profile. As the depth increased, the ratio decreased. These results are in good agreement with the previous hardness measurement results. It can be considered that this technique could be applied for remote and time-efficient hardness measurement.