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RFID 태그 추적을 위한 캐시 & 메인 메모리 기반의 색인 기법(CSTmr-tree)
홍진숙 ( Jin-suk Hong ),윤성대 ( Sung-dae Youn ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.1
주기억 색인 기법인 Tmr-트리가 R-트리에 비해서 삽입시간이 오래 걸린다는 단점이 있다. 본 논문은 L2 캐시를 최대한 활용하여 기존 Tmr-트리의 장점을 가지는 새로운 CSTmr-트리(Cache Sensitive Tmr-트리)구조를 제안하고, 이 구조에 삽입, 삭제 등의 알고리즘을 제안하였다. 제안한 구조와 알고리즘을 다른 인덱스 구조와 비교하여 CSTmr-트리의 우수성을 보인다.
권진(Kwon, Jin),정의봉(Jeong, Weui-Bong),홍진숙(Hong, Chin-Suk) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.10
Acoustic power transmission loss(TL) is an important performance of the muffler system. TL will be affected by the velocity of the fluid in duct since acoustic pressure varies according to the fluid velocity. In this paper, two kinds of fluid model, potential flow and turbulent flow, for the fluid flowing in simple expansion chamber are considered. The effects of their two fluid models in acoustic TL are investigated for the straight and L-shaped simple expansion chamber. In higher frequency range, the characteristics of TL of the two fluid models show different results. The variation of TL according to the fluid velocity is shown more distinctly when turbulence model is used. Turbulent flow model should be used to obtain better estimation of acoustic TL in higher frequency range.
가진력 규명을 통한 초고압 변압기의 구조진동 및 방사소음 예측
유석진(Yoo, Suk-Jin),정병규(Jung, Byung-Kyoo),정의봉(Jeong, Weui-Bong),홍진숙(Hong, Chinsuk),김태용(Kim, Tae-Yong) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.6
In order to predict structural vibration and radiated noise of high-voltage transformer in operation, it is necessary to precisely find the excitation force generated by the coils and core. However, finding the excitation force through experiments of high voltage transformer in operation is not possible. Therefore, this paper deals with identifying the excitation force by using the acceleration data measured through experiments and the transfer function estimated through finite element model. A method to predict structural vibration and radiated noise was also proposed. Three-phase windings and the core are the source of high-voltage transformer. The excitation forces were identified using the acceleration data and the transfer function of the surface of the tank. Structural vibration and radiated noise from the surface of the tank was predicted by using the identified excitation force. As a result of the interpretation of the experimental and computational analysis of structural vibration from the surface of the tank and radiated noise from the field point, the interpretation of the computational analysis showed relatively good accordance with the experiment.