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기관내 삽관에 의한 혈압과 심박수 변화에 대한 Urapidil 의 효과
양희성,신창규,김영추,전석봉,임준구 대한마취과학회 1996 Korean Journal of Anesthesiology Vol.31 No.4
Background: Urapidil is a new antihypertensive agent known to diminish total peripheral vascular resistance by postsynaptic a 1-adrenergic blockade and central sympatholytic activity. The purpose of this study was to determine its effectiveness and safety in preventing hemodynamic responses to endotracheal intubation under general anesthesia. Methods: Thirty normotensive, ASA physical status I patients for elective surgery were selected randomly. They were divided into three groups(Group 1: control group with saline, Group 2: urapidil 0.4 mg/kg, Group 3: urapidil 0.5 mg/kg, n=10 in each group). The drugs were injected 3 minutes before induction with thiopental sodium(4 mg/kg) and succinylcholine(1 mg/kg). Endotracheal intubation was performed 5 minutes after the drugs injection. After endotracheal intubation, vecuronium 0.1 mg/kg was injected and 50% nitrous oxide in oxygen and 2Vo1% enflurane were inhaled. We measured the blood pressure and the heart rate with noninvasive method at one minute interval for 5 minutes. Results: In group 3, no significant increase in systolic blood pressure after endotracheal intubation was noted(p$lt;0.05). Urapidil groups showed increase in heart rate at 1, 2 minutes after urapidil injection(p$lt;0.05) and did not blunt increase in heart rate after endotracheal intubation. The side effects of urapidil(hypotension, dizziness, headache and chest tightness) occured in a patient of group 3. Conclusions: We found that the blood pressure response was effectively controlled, but the change in heart rate was not controlled by urapidil 0.5 mg/kg injection before induction.
경계선 검출 성능에 영향을 주는 변수 변화에 따른 경계선 검출 알고리듬 성능의 정량적인 평가 방법
양희성,김유호,한정현,이은석,이준호 한국통신학회 2000 韓國通信學會論文誌 Vol.25 No.6
This research features a method that quantitatively evaluates the performance of edge detection algorithms. Contrary to conventional methods that evaluate the performance of edge detection as a function of the amount of noise added to he input image, the proposed method is capable of assessing the performance of edge detection algorithms based on chosen parameters that influence the performance of edge detection. We have proposed a quantitative measure, called average performance index, that compares the average performance of different edge detection algorithms. We have applied the method to the commonly used edge detectors, Sobel, LOG(Laplacian of Gaussian), and Canny edge detectors for noisy images that contain straight line edges and curved line edges. Two kinds of noises i.e, Gaussian and impulse noises, are used. Experimental results show that our method of quantitatively evaluating the performance of edge detection algorithms can facilitate the selection of the optimal dge detection algorithm for a given task.
경계선 검출 알고리듬의 검출 성능 평가를 위한 정량적인 측정 방법
양희성,김유호,이준호 成均館大學校 科學技術硏究所 2000 論文集 Vol.51 No.1
This research features a method that quantitatively evaluates the performance of edge detection algorithms. Contrary to conventional methods that evaluate the performance of edge detection as a function of the amount of noise added to the input image, the proposed method is capable of assessing the performance of edge detection algoritms based on chosen parameters that influence the performance of edge detection. We have proposed a quantative measure, called average performance index, that compares the average performance of different edge detection algorithms. We have applied the method to the commonly used edge detectors, Sobel, LOG(Laplacian of Gaussian), and Canny edge detectors for images that contain. straight line edges and curved line edges. Experimental results show that our method of quantitatively evaluating the performance of edge detection algorithms can facilitate the selection of the optimal edge detection algorithm for a given task.