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주파수 가변 고속 디지털 MRI 모뎀 RF부 설계와 구현
김용철,박현대,김대진 전남대학교 전자통신기술연구소 2001 전자통신기술논문지 Vol.4 No.1
In this paper, we designed and made RF block of variable frequency digital modem for high speed MIRI system that can support not only multi-nuclei system but also any magnetic intensity(1.0T~3.0T). We executed simulation of fixed frequency digital modem using fixed band pass filter(BPF), variable frequency digital modem using variable band pass filter(tunable filter). Based on these simulations, variable band pass filter(tunable filter) named Micropole is ordered and manufactured. We designed and made RF block of variable frequency digital modem for high speed MRI system using variable band pass filter(tunable filter). And then we tested this board using PC and function generator and observed the output spectrum using spectrum analyzer. These spectrums are very clear and wide bandwidth about 500KHz and the level of main spectrum is 60~70dB more than harmonics or spurious. This difference of level is available for MRI system.
임베디드 리눅스 기반의 DTV 트랜스포트 스트림 저장/재생 시스템 설계 및 구현
박현대,장용석,최효정,김대진 전남대학교 전자통신기술연구소 2002 전자통신기술논문지 Vol.5 No.1
The embedded system requests for its device of control in the age of the digital broadcasting nowadays. Digital broadcasting equipments for transceiver digital broadcasting divided ATSC and DVB, Also, interface standards are made of SMPTE 310M, SPI, ASI and so on. In this paper, we are designed and implemented digital TV data recording/replay system for Transport Stream Converter's performance of the improvement. Based on the Intel StrongARM processor(SA-1110_, embedded linux, and IDE HDD.