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흰쥐 후지근 피판에서 허혈-재순환 손상시 pERK1/2 발현에 대한 ${\alpha}-lipoic$ Acid의 효과
송정훈,김민선,박병림,박한수,채정룡,이혜미,나영천,Song, Jeong-Hoon,Kim, Min-Sun,Park, Byung-Rim,Park, Han-Su,Chae, Jeong-Ryong,Lee, Hye-Me,Na, Young-Cheon 대한미세수술학회 2005 Archives of reconstructive microsurgery Vol.14 No.2
Purpose: This study was to evaluate the effect of ${\alpha}-lipoic$ acid, a potent free radical scavenger, on the expression of active form of extracellular signal-regulated kinase (pERK1/2) proteins from hindlimb muscles of rats following ischemia-reperfusion injury. Material and methods: 64 health, $280{\sim}350\;g$ weighted Sprague-Dawley male rats were used. In order to make a muscle flap, the gastrocnemius (GC) and soleus (SOL) muscles were dissected and elevated. The popliteal artery was occluded for 4hours and reperfused for 10 minutes, 30 minutes, 1 hour, 2 hours and 4 hours, respectively. Results: The ischemia by occlusion of the popliteal artery itself caused a minimal change in expression of phosphorylated form of proteins observed in hindlimb muscle. In contrast, after 4 hours of ischemia, immunoreactivity for pERK1/2 in the GC muscle showed dual peaks at 10 minutes and 4 hours after reperfusion. In ${\alpha}-lipoic$ acid treated group, the expression of pERK1/2 was increased significantly compared to I/R-only group. Conclusion: These results suggest that ${\alpha}-lipoic$ acid may protect I/R injury of the skeletal muscle through free radical scavening and activation of intracellular pERK1/2 expression.
송정훈,정의철,권성택,Song, Jeong-Hoon,Jeong, Eui-Cheol,Kwon, Sung-Tack 대한미세수술학회 2009 Archives of reconstructive microsurgery Vol.18 No.2
Purpose: Microsurgery is an essential technique in plastic and reconstructive surgery. However, microsurgical suturing and handling of the instrument are difficult for beginners, and who requires a steep learning curve. Therefore, methods for improving the technical skill are needed. The authors describe the value of a small stereoscopic microscope as a training tool. Materials and Methods: A small stereoscopic microscope was used to help improve the microsurgical skill. Monofilament 10-0 Nylon and a surgical rubber globe were used as a suture material and education material, respectively Result: Stereoscopic view of the operation field was obtained and basic microsurgical suture was possible. Conclusion: The stereoscopic microscope is an effective training tool for beginners of microsurgery with benefits in cost and usefulness in small place.
강화학습 기반 이동형 로봇 자율주행: 가변 HER 및 분리형 메모리 기술의 적용
송정훈(Jeong-Hoon Song),박민재(Minjae Park),권남규(Nam Kyu Kwon) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
In this paper, we propose a variable HER-based separated memory method for autonomous driving of a mobile robot based on reinforcement learning. The proposed dynamic HER technology is applied variably by stopping and proceeding after determining the level of policy establishment based on the reward received in the learning process. In order to verify the efficiency of the proposed method, the experimental results for separate and integrated data are compared and analyzed.
Yaw Rate 및 Side Slip Angle 추정을 위한 비선형 관측기 설계
송정훈(Jeong-Hoon Song) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.5
A non-linear vehicle model and an observer are designed to observe the yaw rate and the body side slip angle when a vehicle is turning maneuver in this study. The developed vehicle model is a full car model and has fourteen degree of freedom. A Luenberg observer is applied to develop the observer. The vehicle model is validated with a reference result and shows good accordance. The observer is tested on dry asphalt, wet asphalt and snow paved road. The results prove the performance of observer is robust and reliable.
영상에서 convolutional denoising autoencoder 모형을 이용한 영상복원
송정훈(Jung Hun Song),김정희(Jeong Hee Kim),임동훈(Dong Hoon Lim) 한국데이터정보과학회 2020 한국데이터정보과학회지 Vol.31 No.1
디지털 영상은 획득, 전송, 처리하는 과정에서 다양한 잡음 (noise)에 의해 훼손되어 이에 따른 영상 복원 (image restoration)의 필요성이 대두되고 있다. 지금까지 영상에서 잡음을 제거하는 방법은 특정분포 하에서 설계된 고유한 필터를 사용하였는데 이 경우 분포의 특성을 만족하지 않는 경우 성능이 현저히 떨어지는 영향이 있다. 본 논문에서는 딥러닝의 convolutional denoising autoencoder (CDAE) 모형을 이용하여 잡음을 제거하고자 한다. CDAE 모형은 CNN (convolutional neural network) 모형과 DAE (denoising autoencoder) 모형의 결합 형태로서 영상의 잡음 분포에 관계없이 적용 가능한 방법이다. 본 논문에서 제안된 CDAE 모형을 평가하기 위해 다양한 잡음 즉, 가우시안 잡음 (gaussian noise), 임펄스 잡음 (impulse noise) 그리고 스펙클 잡음 (speckle noise) 에 의해 훼손된 영상을 고려하였으며, 성능실험결과, CDAE 모형은 기존의 CNN 모형 및 전통적인 필터 즉, Mean 필터, Median 필터 그리고 Lee 필터 보다 좋은 복원 영상을 낳았고 또한, PSNR (peak signal-to-noise ratio)와 MAE (mean absolute error) 면에서 좋은 수치를 보였다. Digital images have been compromised by various noise in the process of acquisition, transmission and processing, resulting in the need for image restoration. Until now, methods of removing noise from images have used unique filters designed under certain distributions, which tend to be significantly less effective if the characteristics of the distribution are not met. In this paper, we are going to use the convolutional denoising autoencoder (CDAE) model of deep learning to eliminate noise. The CDAE model is a combination of the CNN (convolutional neural network) model and the DAE (denoising autoencoder) model, which is an applicable method regardless of the noise distribution of images. In order to evaluate the CDAE model proposed in this paper, we considered images damaged by various noises, Gaussian noise, impulse noise and speckle noise. We compared our CDAE model with CNN and traditional filters such as Mean filter, Median filter and Lee filter. Experimental results on several images show that the CDAE model yields significantly superior image quality and better PSNR (peak signal-to- noise ratio) and MAE (mean absolute error).
송정훈 ( Jung Hoon Song ),허진국 ( Jin Gook Huh ),김유선 ( You Sun Kim ),이진호 ( Jin Ho Lee ),장원철 ( Won Cheol Jang ),옥경선 ( Kyung Sun Ok ),류수형 ( Soo Hyung Ryu ),이정환 ( Jung Hwan Lee ),문정섭 ( Jeong Seop Moon ) 대한장연구학회 2008 Intestinal Research Vol.6 No.2
Background/Aims: Although colonic diverticular disease is less common in Koreans than in Western people, its incidence has been on the increase in Korea. We investigated the clinical characteristics and related complications of colonic diverticular disease in Koreans. Methods: We retrospectively reviewed the medical records of 9,006 patients who underwent colonoscopy at the Seoul Paik hospital between July 2002 and January 2008. Results: Of the 9,006 patients, there were 654 cases (7.3%) of colonic diverticulosis (472 men, 182 women). The mean age of the patients was 54.6±12.0 years. The right colon was involved in 535 cases, the left colon was involved in 86 cases and both the left and right colon was involved in 33 cases. Among the patients, a single diverticulum was seen in 253 cases and two or more diverticuli were seen in 401 cases. Related complications were diverticulitis (11 cases, 1.7%) and diverticular bleeding (3 cases, 0.5%). Conclusions: The incidence of colonic diverticular disease in Korea shows an increasing trend. Colonic diverticular lesions are frequently found in the right colon. (Intest Res 2008;6:110-115)