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소멸 필터 기반의 낮은 계수 한켈 행렬 기법을 이용한 B-mode 초음파 영상 복원 연구
윤여훈(Yeo Hun Yoon),예종철(Jong Chul Ye) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
Ultrasound image is one of the non-invasive imaging system. Ultrasound image is safe and real-time imaging system. So, it has huge rawdata. To overcome this weakness, we propose annihilating filter-based low-rank hankel matrix approach (ALOHA) without ant changes of hardwares or beamformer. We exploit temporal redundancy between adjacent temporl frames, and apply low-rank matrix completion algorithm. Reconstruction results which are made by real experiment data are shown without significant artifacts.
기질성 뇌증후군에서 Oxiracetam의 임상적 효과에 대한 이중맹검 대조연구
이병철(Byung Chul Lee),권기한(Ki Han Kwon),김상윤(Sang Yun Kim),송홍기(Hong Ki Song),김성민(Sung Min Kim),유경호(Kyung Ho Yoo),이현미(Hyun Mi Lee),강경수(Kyung Soo Kang),윤여훈(Yeo Hun Yoon) 대한약학회 1993 약학회지 Vol.37 No.5
Previous experimental and clinical investigations suggest a possible role of new nootropic drug, oxiracetam, in improving cognitive performances in patients affected by organic brain syndrome. In this study, that cognitive and behavioral effects of oxiracetam treatment in patients with clinical symptoms of organic brain syndrome were evaluated. Sixty-six patients were enrolled and assigned to either oxiracetam or placebo, according to a randomized, double-blind design between two patient-groups. Either oxiracetam or placebo was orally given bid for 8 weeks ; daily dose of oxiracetam was 1600mg. All the patients, enrolled in this study, were diagnosed as having mild to moderate cognitive dysfunction as defined by a baseline Mini Mental State Examination Korean version (MMSE-K) score between 14 and 25. The patients underwent, at baseline, 4 weeks and 8 weeks after, routine laboratory study (CBC, SMA12, U/A, EKG) and the following neuropsychological tests ; MMSE-K, modified Korean Wechsler Intelligence Scale(MKWIS), Nurses'' Observation Scale for Geriatric patients(NOSGER). Fifteen patients of whom were dropped out or excluded from the analysis because of poor compliance or violation of the protocol. Fiftyone patients (aged 54~78 years, male 25, female 26) were analyzed (vascular dementia, 30 ; senile dementia of Alzheimer type, 9 ; mixed type, 5 ; other cause, 7). Statistical analysis of the data demonstrated that the two groups were comparable at baseline. At the end of each study period the oxiracetam group scored significantly better on the majority of the tests evaluating cognitive function, psychometricity and the improvement rating scale of subjective symptoms than placebo group, in which worsening trends or no changes were seen on the whole. No side effects were noted during oxiracetam treatment. The present study, showing positive clinical findings after oxiracetam therapy, confirmed that this drug can be useful pharmacological treatment in organic brain syndrome.
SHS 공정에 의한 텅스텐 산화물로부터 고순도 텅스텐분말 제조
이승영,윤여훈,이종현,원창환 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.1
99% Pure tungsten powders were prepared by self-propagating high temperature synthesis (SHS) process from a mixture of ammonium paratungsten(APT) and Mg powders. The concurrently formed MgO in the product was leached with an HCI solution. The optimum molar ratio of APT to Mg is 1:46 and the compaction pressures range from 2000 to 4000 psi. The propagation velocity and combustion temperature increased, as the compact diameter increased. The weight change and elongation of the SHS product were affected by compaction pressure on the green pellet. The tungsten product had a purity of 99% and mean size of 2∼3 μm.