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강희철,김철영 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-
This paper deals with the Ambient Vibration Test method to estimate dynamic characteristics of structures. The AVT is more effective than the FVT since it dose not need the control of traffic and the expensive exciting equipment for the large structures. The AVT has been used in other countries but there has been little number of applications in Korea. A simple beam modal test was performed in laboratory to find the difference in dynamic characteristics due to the change of support condition and the damage in member. The natural frequency showed a minor change in higher modes but there was a considerable change in mode shape even in lower modes. For this reason, when a dynamic testing is performed, the mode shape should be estimated as well as the natural frequency up to higher modes. Also, the possibility of applying AVT on the monitoring system was examined.
70MIPS 이내에서 동작하는 MPEG-2 AAC 부호화 칩 설계
강희철,박주성,정갑주,박종인,최병갑,김태훈,김승우,Kang Hee-Chul,Park Ju-Sung,Jung Kab-Ju,Park Jong-In,Choi Byung-Gab,Kim Tae-Hoon,Kim Sung-Woo 대한전자공학회 2005 電子工學會論文誌-SD (Semiconductor and devices) Vol.42 No.4
MPEG-2 오디오 압축방식인 AAC(Advanced Audio Coding) LC(Low Complexity) 스테레오 부호화기를 고속으로 구현할 수 있는 칩을 32비트 DSP 코어를 기반으로 설계하고 0.25um CMOS 기술을 이용하여 제작하였다. 계산량과 메모리 용량을 줄이기 위하여 알고리즘 구현방법 측면에서 최적화를 하였으며, FFT(Fast Fourier Transform)를 하드웨어로 구현하여 고속화하였다. 제작된 칩의 크기는 $7.20\times7.20 mm^2$ 이었으며 등가 게이트는 약 830,000 이었으며 70MIPS 이내에서 AAC 부호화를 할 수 있음을 확인하였다. A chip, which can fast encoder the audio data to AAC (Advanced Audio Coding) LC(Low Complexity) that is MPEG-2 audio standard, has been designed on the basis of a 32 bits DSP core and fabricated with 0.25um CMOS technology. At first, the various optimization methods for implementing the algerian are devised to reduce the memory size and calculation cycles. FFT(Fast Fourier Transform) hardware block is added to the DSP core to get the more reduction of the calculation cycles. The chips has the size of $7.20\times7.20 mm^2$ and about 830,000 equivalent gates, can carry out AAC encoding under 70MIPS(Million Instructions per Second).