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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.
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.
원주민,홍영준,현대용,정형기,오성식,Hyung Yoon Kim,김용철,박혁진,김민철,조재영,이기홍,심두선,윤남식,윤현주,김계훈,박형욱,김주한,안영근,정명호,조정관,박종춘 전남대학교 의과학연구소 2018 전남의대학술지 Vol.54 No.3
We investigated predictors of major adverse cardiac events (MACE) with two years after medical treatment for lesions with angiographically intermediate lesions with intravascular ultrasound (IVUS) minimum lumen area (MLA) <4 mm2 in non-proximal epicardial coronary artery. We retrospectively enrolled 104 patients (57 males, 62±10 years) with angiographically intermediate lesions (diameter stenosis 30-70%) with IVUS MLA <4 mm2 in the non-proximal epicardial coronary artery with a reference lumen diameter between 2.25 and 3.0 mm. We evaluated the incidences of major adverse cardiovascular events (MACE including death, myocardial infarction, target lesion and target vessel revascularizations, and cerebrovascular accident) two years after medical therapy. During the two-year follow-up, 15 MACEs (14.4%) (including 1 death, 2 myocardial infarctions, 10 target vessel revascularizations, and 2 cerebrovascular accidents) occurred. Diabetes mellitus was more prevalent (46.7% vs. 18.0%, p=0.013) and statins were used less frequently in patients with MACE compared with those without MACE (40.0% vs. 71.9%, p=0.015). Independent predictors of MACEs with two years included diabetes mellitus (odds ratio [OR]=3.41; 95% CI=1.43-8.39, p=0.020) and non-statin therapy (OR=3.11; 95% CI=1.14-6.50, p=0.027). Long-term event rates are relatively low with only medical therapy without any intervention, so the cut-off of IVUS MLA 4 mm2 might be too large to be applied for defining significant stenosis. The predictors of long-term MACE were diabetes mellitus and statin therapy in patients with angiographically intermediate lesions in non-proximal epicardial coronary artery.