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효율적인 음향 윈도우 설계를 위한 2차원 유한요소법 기반의 과도 해석
김유창(Kim, Y.C.),김석구(Kim, S.K.),윤석왕(Yoon, S.W.),이영관(Lee, Y.),조미숙(Cho, M.S.),신구균(Shin, Ku-Kyun),구자춘(Koo, J.C.) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.7
The efficiency of active sonar that is used underwater observation equipment is important for obtain the information of topography and trace for the objects. Sound wave transmitted from sonar are distorted by acoustic window which is to protect sonar. Making various sonar dome is impossible for experiment, because consumed unnecessary time and expense. So, the purpose of this study is to simulate and analyze the acoustic window propagated sound wave from sonar for designing model reduced insertion loss. Simulation is performed by transient analysis and fluid-structure interaction analysis. As a result, this study will give a opportunity for efficient design of sonar dome without high cost and time consumption.
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.
이남훈(Lee, Nam-Hun),권정민(Kwon, Jeong-Min),구자춘(Koo, J.C.) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.2
As functional requirement of massive digital information storage devices are on a trend for the higher data transfer rate and lower cost, many different technical efforts are being tested and implemented in the industry. FDB(fluid dynamic bearing) is one of the major breakthroughs in rotor design in terms of TMR(track misregistration) budget. Although FDB analysis based on Reynolds' equation is well established and popularly being used for FDB design especially for the estimation of bearing stiffness, there are obvious limitations in the approach due to the inherent assumptions. A generalized analysis tool employing the full Navier-Stokes equation and the energy balance is to be beneficial for detailed FDB design. In this publication, an efficient geometry modeling method is presented that provides fully integrated inputs for general FVM/FDM(finite volume method/ finite difference method) codes. By virtue of the flexibility of the presented method, many different detailed FDB design and analysis are carried over with ease.