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권유정 ( You Jung Kwon ),장창익 ( Chang Ik Zhang ),표희동 ( Hee Dong Pyo ),서영일 ( Young Il Seo ) 한국어업기술학회 2013 수산해양기술연구 Vol.49 No.1
It was compared the estimated parameters by the surplus production from three different models, i.e., three types (Schaefer, Gulland, and Schnute) of the traditional surplus production models, a stock production model incorporating covariates (ASPIC) model and a maximum entropy (ME) model. We also evaluated the performance of models in the estimation of their parameters. The maximum sustainable yield (MSY) of small yellow croaker (Pseudosciaena polyactis) in Korean waters ranged from 35,061 metric tons (mt) by Gulland model to 44,844 mt by ME model, and fishing effort at MSY (fMSY) ranged from 262,188 hauls by Schnute model to 355,200 hauls by ME model. The lowest root mean square error (RMSE) for small yellow croaker was obtained from the Gulland surplus production model, while the highest RMSE was from Schnute model. However, the highest coefficient of determination (R2) was from the ME model, but the ASPIC model yielded the lowest coefficient. On the other hand, the MSY of Kapenta (Limnothrissa miodon) ranged from 16,880 mt by ASPIC model to 25,373 mt by ME model, and fMSY, from 94,580 hauls by ASPIC model to 225,490 hauls by Schnute model. In this case, both the lowest root mean square error (RMSE) and the highest coefficient of determination (R2) were obtained from the ME model, which showed relatively better fits of data to the model, indicating that the ME model is statistically more stable and robust than other models. Moreover, the ME model could provide additional ecologically useful parameters such as, biomass at MSY (BMSY), carrying capacity of the population (), catchability coefficient () and the intrinsic rate of population growth ().
장순석,권유정,이제형,Jarng, Soon-Suck,Kwon, You-Jung,Lee, Je-Hyeong The Acoustical Society of Korea 2006 韓國音響學會誌 Vol.25 No.e1
Two twin microphones may produce particular patterns of binaural directivity by time delays between the twin microphones. The boundary element method (BEM) was used for the simulation of the sound pressure field around the KEMAR head model in order to quantify the acoustic head effect. The sound pressure onto the microphone was calculated by the BEM to an incident sound pressure. Then a planar directivity pattern was formed by four sound pressure signals from four microphones. The optimal binaural directivity pattern may be achieved by adjusting time delays at each frequency while maintaining the forward beam pattern is relatively bigger than the backward beam pattern. The simulation results were verified by the experimental measurement.
장순석,권유정,Jarng, Soon-Suck,Kwon, You-Jung 한국음향학회 2017 韓國音響學會誌 Vol.36 No.2
본 논문은 보청기의 지향성 알고리즘을 실시간으로 실현한 내용을 다루었다. 기존의 시간 영역에서의 시간 지연 기법에 의한 지향성 실현을 디지털 필터 방식으로 처리함으로써 시간 지연 적용이 불가능한 일반 DSP(Digital Signal Processing) 칩으로도 유사한 지향성 패턴을 가능하게 하였다. 시간 지연 기법과 디지털 필터 기법을 각각 Matlab(Matrix laboratory) 기반으로 비교 검증한 후에, 이를 CSR 8675 블루투스 DSP IC(Digital Signal Processing Integrated Circuit) 칩 펌웨어로 실현하고 검증해보였다. 스마트폰으로의 원격 무선 제어 기능으로 스마트 자향성 보청기의 사용자 접근 편의성을 강화시켰다. In this paper, the realization of a directional digital hearing aid was considered. Conventional time domain time delay method was replaced with digital filters in order to make any general-purposed DSP (Digital Signal Processing) chip to produce the similar directivity pattern. Both the time delay algorithm and the digital filter algorithm were initially evaluated by Matlab (Matrix laboratory) for comparison, and it was confirmed by CSR 8675 Bluetooth DSP IC (Digital Signal Processing Integrated Circuit) chip firmware realization. Some remote control features by a smart phone was added to the smart hearing aid for user interface easiness.