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정도 부사를 이용한 텍스트 분류 작업에서의 데이터 증강에 관한 연구
김지환(Jihwan Kim),조원익(Wonik Cho),이동준(Dongjune Lee),김남수(Nam Soo Kim) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
본 논문은 상대적으로 적은 레이블 데이터가 주어진 환경에서 신경망의 과적합을 방지하기 위한 방법론 중 하나인 데이터 증강에 관한 연구이다. 주제 분류와 같은 텍스트 분류 작업에서는 문장의 정도성이라는 의미자질이 크게 영향을 끼치지 않을 것이라 가정하고, 7개의 정도 부사를 선정해 임의의 수의 부사를 문장 내 임의의 위치에 삽입하여 데이터 증강을 한 후, 신경망 출력의 정확도를 기존 데이터, 최신 데이터 증강 기법을 적용한 데이터를 이용한 정확도와 비교하는 것으로 정도 부사를 통한 데이터 증강의 효과를 검증하였다. 그 결과, 본 논문에서 제안하는 방법이 증강이 이루어지지 않은 경우와 최신 데이터 증강 기법을 적용한 경우보다 좋은 정확도를 보이는 것을 확인하였다.
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자동차부품 소재개발을 위한 티타늄 합금의 0.3Tm 크리프 거동
황경충(Kyungchoong Hwang),윤종호(Jongho Yoon),조원익(Wonik Cho) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Titanium alloy has widely been used as automotive part material because it has high specific strength and also is light, harmless to human body. But, we have little design data about the creep behaviors of the alloy. Therefore, in this study, every creep test under four constant stress conditions have been conducted for four temperature conditions around 0.3Tm. A series of creep tests had been performed to get the basic design data and life prediction of titanium products and we have gotten the following results. First, the stress exponents decreased as the quenching temperatures increase. Secondly, the creep activation energy gradually decreased as the stresses become bigger. Thirdly, the constant of Larson-Miller parameters on this alloy was estimated about 2.0. And last, the fractographs at the creep rupture showed the ductile fracture due to the intergranullar rupture and a few dimples.
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SM490B 용접부의 피로균열 성장 거동에 미치는 초고속 용사코팅 효과
윤명진(Myungjin Yoon),최성종(Sungjong choi),조원익(Wonik Cho) 한국자동차공학회 2005 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
High velocity oxygen-fuel thermal spray coating of the WC-Co cermet material is a well-established process for modifying the surface properties of the structural components exposed to the corrosive and wear attacks, and also these coating are well-known method to improve the fatigue strength of material. In this study. HVOF coated SM490B weldments are prepared to evaluation of the effect of coating on tension and fatigue crack growth behavior. The pre-crack of the fatigue crack growth test specimens machined at deposited material area, heat affected zone and boundary, respectively. Through these test, the following results are obtained: 1) Tensile strength is about 498 MPa, and fracture occurred on base metal area. 2) The fatigue crack of coated specimens propagated more rapidly than non-coated specimen in all specimens. 3) In the same coating thickness specimens, the specimens with pre-crack at boundary more rapidly propagated than the specimens with pre-crack at HAZ and deposited material area. These results can be used as basic data in a structural integrity evaluation of rolled SM490B weldments considering HVOF coating.
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SM490B 용접부의 피로균열 성장 거동에 미치는 초고속 용사코팅 효과
윤명진(Myungjin Yoon),최성종(Sungjong Choi),조원익(Wonik Cho) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.4
High velocity oxygen-fuel thermal spray coating of the WC-Co cermet material is a well-established process for modifying the surface properties of the structural components exposed to the corrosive and wear attacks, and also these coating are well-known method to improve the fatigue strength of material. In this study, HVOF coated SM490B are prepared to evaluation of the effect of coating on tension and fatigue crack growth behavior. The pre-crack of the fatigue crack growth test specimens machined at deposited material area, heat affected zone and boundary, respectively. Through these test, the following results are obtained: 1) Tensile strength was about 498 MPa, and fracture occurred on base metal area. 2) The fatigue crack of coated specimens propagated more rapidly than non-coated specimen in all specimens. 3) In the same coating thickness specimens, the specimens with pre-crack at boundary more rapidly propagated than the specimens with pre-crack at HAZ and deposited material area. These results can be used as basic data in a structural integrity evaluation of rolled SM490B weldments considering HVOF coating.
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