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송철구,윤종락 釜山水産大學校 1994 釜山水産大學 硏究報告 Vol.34 No.1
The formant frequency is a key signature of speech signal and it is a main parameter in speech recognition and synthesis. The object of this study is to characterize and to standardize the formant frequencies of Korean single vowels. The measured people groups consist of man, woman, boy and girl and each group size is 30 persons. The LPC(Linear Predictive Coding) autocorrelation technique is adopted to analyze the formant frequencies and the LPC order is 15 which could be optimum value to figure out the effects of the glottis and the radiation including the vocal tract. The mean values and standard deviation of 1st formant frequeney F1 to 5th formant frequency F5 are obtained and the F1-F2 scatter diagrams of four groups are also presented. The result is compared with Japanese vowel formant frequencies. the overall characteristics is similiar each other but the Korean F2 of vowel/우/is 200 ㎐ lower than that of Japanese. Another finding is that it is difficult to characterize the children's formant frequencies due to their large diversity.
BLDC 모터의 속도 제어를 위한 퍼지 가변 구조제어에 관한 연구
진광식,윤태성,박종락 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
This paper shows the efficiency of fuzzy integral variable structure controller(FIVSC) with sliding mode which outperforms a traditional variable structure controller(VSC). This approach of the FIVSC solves the chattering problem which has been occurred in VSC and is applied to brushless D.C. motor. The simulation results verify the efficiency of the FIVSC.
이홍영,정성환,윤정현,강희영,최종락 대한방사선 방어학회 1993 방사선방어학회지 Vol.18 No.2
중수로형 원자로에서 방출되는 사용후핵연료 다발을 안전하게 운반할 목적으로 CANDU 수송용기에 대한 방사선차폐해석을 수행하였다. 핵연료의 연소도는 7,800MWD/MTU, 냉각기간은 5년으로 하여 ORIGEN2 코드로 방사선원을 구하고 이것으로 핵연료 378다발을 운반할 수 있는 수송용기의 차폐체 두께변화에 따른 선량율 영향을 비교하였다. 계산은 ANISN과 DOT4.2 코드를 사용하였으며, 해석결과 최적의 차폐구조를 선정하였으며, 또한 IAEA 및 국내원자력법의 수송법규에 명시된 정상수송 및 가상사고조건에 따른 차폐해석을 수행하여 CANDU 수송용기의 안전성을 입증하였다. A shielding analysis of the shipping cask for transporting the CANDU spent fuel bundles has been studied. Radiation source term has been calculated on spent fuel with burnup of 7,800 MWD/MTU and 5 years cooling time by ORIGEN2 code. The shielding calculation for the cask capable of transporting 378 bundles of CANDU spent fuel has been made by use of 1-D ANISN and 2-D DOT 4.2 codes. As result of analysis, the optimum shield thickness of cask was obtained. And it is proved that the safety in radiation shielding under normal transport and hypothetical accident conditions is confirmed to satisfy the allowable values specified in IAEA Safety Series No. 6 and the Korean Atomic Law.
김기범,권대규,이삼철,김성종,정인수,오인혁,김기주,변윤섭,정경락 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.2
본 연구는 급성호흡부전환자를 치료하기 위하여 사용되고 있는 혈관 내 폐 보조장치의 기체전달을 향상시키기 위하여 중공사막에 진동기법을 사용하여 기체전달을 향상시키고자 시도하였다. 그리고 혈관 내 폐 보조장치를 정맥에 삽입하기 전, 혈관 내 폐 보조장치의 설계조건을 실험적 모델을 통하여 기체전달을 예측할 수 있는 예측식을 만들고자 하였다. 실험결과, 본 연구에서는 진동기법이 기체전달을 향상시키는데 효과적임을 확인할 수 있었다. 뿐만 아니라, 충진율과 가징 주파수의 함수관계를 이용하여 기체전달을 예측 할 수 있었다. 실험에 의하여 얻어진 결과는 예측식에 의하여 얻어진 결과와 유사한 결과를 얻었다. 그러므로 본 연구에서는 충진율과 가진 주파수의 함수를 이용하여 VIVLAD의 기체전달을 예측할 수 있었다. In this paper, we tried to improve gas exchange of the vibrating intravascular lung assist device(VIVLAD) using vibrating method in the hollow fiber membrane, for the patients suffering from acute respiratory distress syndrome(ARDS). And we tried to formularize prediction equations to make a prediction about gas transfer for designing intravenous artificial lung assist device, and designed modules under various conditions were studied through an experimental modeling before inserted the artificial lung assist device into as venous. As a result, we are convinced that vibration method is very useful for the has transfer increasing. Also, we can estimate the gas transfer as a function of the packing density and excited frequencies. The gas transfer obtained from the experiment was similar to that from the prediction equation, confirming the usefulness prediction equation. Therefore, we can estimate the gas transfer of the VIVLAD as a function of the packing density and excited frequencies.
Effective Detection Method of Unstable Acoustic Signature Generated from Ship Radiated Noise
Yoon, Jong-Rak,Ro, Yong-Ju The Acoustical Society of Korea 2001 韓國音響學會誌 Vol.20 No.e1
The unstable signature that is defined as frequency change with respect to the time or frequency modulation, is caused by the external loading variation in specific machinery component and Doppler shift etc. In this study, we analyze the generation mechanism of the unstable signature and apply the Extended Kalman filter (EKF) algorithm for its detection. The performance of Extended Kalman Filter is examined for numerical and measured signals and the results show its validity for unstable signature detection.