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이상봉(Lee, S.B.),인용석(Ihn, Y.S.),오동호(Oh, D.H.),김하용(Kim, H.Y.),이호성(Lee, H.S.),구자춘(Koo, J.C.) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.8
The unbalanced mass of a high precision rotor deteriorates mechanical performance of the rotor. The geometrical center of a rotor generally corresponds to the rotational axis of the rotor. However, this alignment carried out with a stationary rotor does not guarantee the dynamic rotor balance. There have been a number of schemes for the correction of the unbalance published for decades especially in the hard drive industry where the issues are directly affecting manufacturing costs and product performances. Realizing the significance of the problem, the present work tries to refine one of the methods that works by applying external impact during a rotor spins. A systematic way to apply the external impact to a rotating rotor has been introduced to minimize unbalance correction process time.
김태호 ( Tae-ho Kim ),장준혁 ( Joon-hyuk Chang ) 한국정보처리학회 2018 한국정보처리학회 학술대회논문집 Vol.25 No.1
본 논문에서는 오디오와 레이더 기반의 딥러닝을 활용한 환경 분류 기술을 제안한다. 제안된 환경 분류 기술은 오디오를 이용한 환경 분류 딥러닝 모델과 레이더를 이용한 딥러닝 모델을 앙상블로 결합하여 환경을 분류한다. 특히,오디오와 레이더 각 성능을 높이기 위해 별도의 모델이 제안된 딥러닝 환경분류 기법은 실내 환경 5 가지를 분류 하였으며,오디오 또는 레이더 단일 데이터를 활용한 환경분류에 비해 우수한 성능을 보였다.
1wt.% Bi 함유 무연황동의 인장강도와 내식특성에 대한 연구
주영석 ( Y S Joo ),이상봉 ( S B Lee ),김시영 ( S Y Kim ),주창식 ( C S Joo ),정병호 ( B H Jung ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.3
This study has been investigated for tensile properties with lead-free brass containing 1wt.% of Bi. And also characteristic of corrosion resistance was analyzed by polarization test. An increase of tempering temperature was found to tend to decrease tensile strength, and percentage of elongation was shown to be the lowest value at 300°C. On the other hand, the elongation was increased with an increase of tempering temperature after 300°C. The change of mechanical properties was closely related with the content and shape of acicular Witmanst?tten α formed at the interface of β phase as well as in β phase. Tensile strength had a tendency to be decreased with an increase of test temperature. The elongation was shown to be the lowest value at around 300°C, while it began to increase as test temperature rose after 300°C. It might be speculated that the reason that elongation was decreased was found to form bismuth film at the interface of α/β phase leading to be easily brittle when loaded by tensile stress. The lead-free brass containing 1wt.% of Bi had similar characteristic of corrosion resistance with a free-cutting brass with 3.4wt.% of Pb in spite of higher fraction of β phase.