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선형 추정 CDF를 이용한 이미지 콘트라스트 향상 기법
최인석(Choi I.S.),황보현(Hwang B.H.),조화현(Cho H.H.),최명렬(Choi M.R.) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅱ
본 논문에서는 영상의 누적분포함수(CDF : Cumulative Density Function)를 이용한 콘트라스트 향상 기법을 제안하였다. 제안된 알고리즘은 처리된 영상에 영향을 주지 않으면서 최대 콘트라스트를 얻을 수 있었다. 하드웨어의 복잡성을 감소하기 위하여 누적분포함수의 샘플값을 이용한 선형화 방법을 이용하였다. 제안한 방식의 알고리즘 검증을 위하여 C를 이용하였으며, 처리 결과와 원 영상의 화질 평가를 위하여 시각적 검증과 히스토그램 편차를 도입 하였다.
중등도 및 중증고혈압에서 Nifedipine 설하투여의 강압효과에 관한 연구
김영훈,서순규,최인석,김열홍,안희권,심완주,노영무 대한내과학회 1986 대한내과학회지 Vol.31 No.5
In order to assess the efficacy of sublingual nifedipine in the acute treatment of moderate to severe hypertension, a single blind test was done in 30 patients, 10 males and 20 females, aged 40 to 76 years, with moderate to severe hypertension. The patients with mean sitting blood pressure(BP) of more than J40 mmHg received sublingual placebo, and BP and pulse rate(PR) were measured in sitting position 10,20 and 30 minutes after the sublingual placebo was given. The patients with post-placebo 30 minutes sitting mean BP of less than 13pmmHg were excluded from the study. The placebo treatment period was followed by the administration of 10mg of sublingual nifedipine, and BP and PR were measured 10,20,30 and 45 minutes after nifedipine was given. BP decreased with placebo treatment(p$lt;0. 01 by paired t-test, preplacebo vs. post-placebo 30 minutes). With sublingual nifedipine BP started to fall in 10 minutes and reached the lowest levels in 30 or 45 minu1es. The systolic BP decreased from 198.0±21.4mmHg to 159±20.4mmHg, diastolic BP from 122.5±13.0 mmHg to 103.2±14.4 mmHg and mean from 147.7±13.4 mmHg to 121.7±14.8 mmHg 45minutes after nifedipine(p$lt;0.01 by paired t-test). The average fall in systolic BP/diastolic BP/mean BP 45 minutes after nifedipine was 39/19/26 mmHg(p$lt;0. 001, by paired t-test). The maximal fall in systolic BP correlated better with pretreatment value(r=0.42) than the maximal fall in diastolic pressure(r=0.21), PR increased from 79±12 to 87±11/minute with nifedipine(p$lt;0.001, by paired t-test). Side effects were mild facial flushing(16.7%) and palpitation (3.3%). The findings suggest that a dose of 10mg of sublingual nifedipine is a simple, effective and safe method for the acute treatment of moderate to severe hypertension and can be used as a non-injecting alternative agent for the treatment of hypertensive emergency.
김영훈,김진호,박영태,이창홍,최인석 대한내과학회 1986 대한내과학회지 Vol.31 No.4
Bicarbonate secretion by the stomach may play a role in gastric mucosal protection, but there is limited information on the amount of bicarbonate secretion. We have therefore examined bicarbonate secretion in 9 normal adults and in 9 patients with duodenal ulcer, using a recently validated method utilizing measurements of gastric juice volume, hydrogen ion concentration and osmolality of gastric juice and plasma. The results are as follows: 1) In 9 healthy subjects, basal gastric bicarbonate secretion rate was 1.5±0.2 mmol/hr(mean±1 SE). After pentagastrin injection(6 mg/kg), the gastric bicarbonate secretion rate increased to 2.5±0.7 mmol/hr but the difference was not significant. 2) In 9 patients with duodenal ulcer, basal gastric bicarbonate secretion rate and gastric bicarbonate secretion after pentagastrin injection were 1.9±0.4 mmol/hr respectively. The difference was not significant, either. 3) The gastric bicarbonate secretion rates were not significantly different in the two groups either basally or after pentagastrin injection.