정신병적 장애

박영민,Park, Yeong-Min 대한산업보건협회 2006 산업보건 Vol.224 No.-

20게이지와 23게이지 평면부 유리체절제술 후 각막지형도 변화의 비교

박영민,이지은,엄부섭.Young Min Park. MD. Ji Eun Lee. MD. Boo Sup Oum. MD 대한안과학회 2009 대한안과학회지 Vol.50 No.3

Purpose: To compare the changes in corneal topography between 23 gauge (G) pars plana vitrectomy (PPV) and 20 G PPV. Methods: Forty-three eyes of 42 patients who underwent PPV were divided into 2 groups: 20G PPV (Group I, n=18) and 23 G PPV (Group II, n=25). Both groups were followed up over 3 months postoperatively. ORBSCAN II was performed to compare the corneal topographic change of 20 G PPV and 23 G PPV. Results: In a 5 mm zone, significant postoperative change in the mean corneal surface cylinder was found between the 1st day and the 1st month in Group I, while no significant change was found in Group II. Postoperatively, the increase in the mean corneal surface cylinder in Group I was significantly higher than in Group II between the 1st day and the 1st month. Clinically significant astigmatism, induced by surgery, was found only in Group I one week after the operation. In a 3 mm zone, there was no significant change in the mean corneal surface cylinder in both groups postoperatively. The difference in the mean corneal surface cylinder between the 2 groups at the postoperative periods showed no significant change. Surgically induced astigmatism was significantly higher in Group I than in Group II between the 1st day and the 1st month postoperatively. Conclusions: PPV with the 23 G system is a sutureless transconjunctival surgery, which appears to be more effective due to insignificant corneal surface and astigmatic changes in the early postoperative period.

컬러패턴분류를 위한 히스토그램 매칭기법

박영민,윤영우,Park, Young-Min,Yoon, Young-Woo 한국정보처리학회 2006 정보처리학회논문지B Vol.13 No.7

Pattern recognition is the study of how machines can observe the environment, learn to distinguish patterns of interest from their background, and make sound and reasonable decisions about the categories of the patterns. Color image consists of various color patterns. And most pattern recognition methods use the information of color which has been trained and extract the feature of the color. This thesis extracts adaptively specific color feature from images with several limited colors. Because the number of the color patterns is limited, the distribution of the color in the image is similar. But, when there are some noises and distortions in the image, its distribution can be various. Therefore we cannot extract specific color regions in the standard image that is well expressed in special color patterns to extract, and special color regions of the image to test. We suggest new method to reduce the error of recognition by extracting the specific color feature adaptively for images with the low distortion, and six test images with some degree of noises and distortion. We consequently found that proposed method shouws more accurate results than those of statistical pattern recognition. 패턴인식은 주위 환경을 관찰하는 방법, 배경으로부터 관심있는 패턴을 구분하는 방법, 소리를 얻는 방법, 그리고 패턴 범주들 중에서 타당한 결정을 얻는 방법에 관한 연구이다. 패턴인식 시스템을 설계할 때 필수적으로 1) 데이터의 획득과 전처리, 2) 데이터의 표현, 3) 결정방법 선택과 같은 세 가지 사항을 고려해야한다. 그 이유는 영상을 획득하기 위한 센서의 선택, 전처리 기법, 표현 기법, 의사결정 모델에 따라 인식의 결과가 달라질 수 있기 때문이다. 컬러영상은 다양한 컬러 패턴으로 구성된다. 대부분의 패턴인식 방법은 훈련되어진 컬러정보를 사용하여 컬러의 특징을 추출한다. 본 논문은 몇 가지 제한된 컬러를 가진 영상으로부터 특정한 컬러 패턴을 적응적으로 추출한다. 컬러 패턴의 수가 한정되어 있기 때문에 영상에서 컬러의 분포가 유사하다. 그러나, 영상에 잡음이나 열화가 존재하면, 그 분포가 변화한다. 그러므로 이미 알고 있는 컬러정보를 가지고 특정한 컬러의 특징을 추출할 수 없다. 그래서 본 논문에서는 유사한 컬러 패턴을 가진 영상에 대하여 특정한 컬러의 특징을 적응적으로 추출함으로서 인식의 오류를 감소시킬 수 있는 새로운 방법을 제안한다. 제안한 방법을 실험하기 위하여 열화가 적은 표본영상을 사용하고, 잡음과 열화가 포함된 여섯 가지의 검사영상을 사용한다. 결론적으로 제안한 방법이 통계적인 패턴인식의 결과보다 정확한 결과를 보여준다.

청폐사간탕(淸肺瀉肝湯)이 급성기 중풍환자의 동맥경직도 및 맥압에 미치는 영향

박영민,홍진우,신원준,정동원,김석민,배형섭,김영석,문상관,정우상,조기호,Park, Young-Min,Hong, Jin-Woo,Shin, Won-Jun,Jeong, Dong-Won,Kim, Seok-Min,Bae, Hyung-Sup,Kim, Young-Suk,Moon, Sang-Kwan,Jung, Woo-Sang,Cho, Ki-Hoo 대한한방내과학회 2006 大韓韓方內科學會誌 Vol.27 No.2

Objectives : Arterial stiffness and pulse pressure are related to cardiovascular and cerebrovascular survival and longevity. This study is aimed at examining the effects of Chungpyesagan-tang on arterial stiffness and Pulse pressure in acute stroke Patients. Methods: The subject of this study was acute strike Patients within 1 week after ictus, with Cardio-ankle vascular index(CAVI) higher than 9.0. They were divided into two groups: A treatment group (n=44) and a control group(n=46). For two weeks, Chungpyesagan-tang was given to the former, other herbal medicines to the latter. used for stroke patients for the control group for 2 weeks. At the end of first and second week, CAVI, pulse Pressure, National Institute of Health stroke scale(NIHSS), Modified Barthel Index(MBI) were measured. Serum lipid Profile, aspartate transaminase(AST), alanine transaminase(ALT). blood urea nitrogen(BUN), creatinine were also measured at the end of the study. Results : After 2 weeks, CAVI and Pulse Pressure in Chungpyesagan-tane group were significantly tower than those in the control group(P<0.05). NIHSS and MBI were improved in both groups. But there was no significant difference between the treatment group and the control group in terms of the NIHSS and MBI. Conclusions : We suggest Chungpyesagan-tanghas desirable effects on arterial stiffness and Pulse Pressure of acute stroke patients. It can improve morbidity and mortality of patients on the basis of influencing vascular stiffness and increased pulse pressure.

동영상에서 물체의 추출과 배경영역의 상대적인 깊이 추정

박영민,장주석,Park Young-Min,Chang Chu-Seok 한국정보처리학회 2005 정보처리학회논문지B Vol.12 No.3

컴퓨터 비젼에 관한 고전적인 연구 주제들 중의 하나는 두 개 이상의 이미지로부터 3차원 형상을 재구성하는 3차원 변환에 관한 것이다. 본 논문은 단안 카메라로 촬영한 일반적인 2차원 영상물에서 능동적으로 움직이는 3차원 영상의 깊이 정보를 추출하는 문제를 다룬다. 연속하는 프레임들간의 영상 블록의 움직임을 평가하여 카메라의 회전과 배율효과를 보상하고 다음과 같은 두 개의 단계에 걸쳐 블록의 움직임을 추출한다. (i) 블록의 위치와 움직임을 이용하여 카메라의 이동과 초점거리에 대한 전역 파라메타를 계산한다. (ii) 전역 파라메타, 블록의 위치와 움직임을 이용하여 평균 영상 깊이에 대한 상대적인 블록의 깊이를 계산한다. 다양한 동영상을 대상으로 특이점인 경우와 그렇지 않은 경우를 실험하였다. 결과로 얻어지는 상대적인 깊이 정보와 객체는 인간이 판단하는 경우와 동일함을 보였다. One of the classic research problems in computer vision is that of stereo, i.e., the reconstruction of three dimensional shape from two or more images. This paper deals with the problem of extracting depth information of non-rigid dynamic 3D scenes from general 2D video sequences taken by monocular camera, such as movies, documentaries, and dramas. Depth of the blocks are extracted from the resultant block motions throughout following two steps: (i) calculation of global parameters concerned with camera translations and focal length using the locations of blocks and their motions, (ii) calculation of each block depth relative to average image depth using the global parameters and the location of the block and its motion, Both singular and non-singular cases are experimented with various video sequences. The resultant relative depths and ego-motion object shapes are virtually identical to human vision.

실리콘관 삽입술에서 관의 고정을 위한 실리콘 시트와 봉합사 사용의 임상적 효과 비교

박영민,구기홍,이지은,이종수,김윤경,Young Min Park,Gi Hong Koo,Ji-Eun Lee,Jong Soo Lee,Yoon Kyung Kim 대한안과학회 2009 대한안과학회지 Vol.50 No.2

Purpose: To compare the clinical outcome of silicone tube intubation according to the tie methods. Methods: Eighty-eight eyes of 87 patients who underwent silicone tube intubation were divided into two groups based on the tie method: a silicone silastic sheet group (Group 1, n=59) and a nylon 6-0 suture knot group (Group 2, n=29). The two groups were compared according to their success rates, recurrence rates and complications. Results: No significant difference was found in the success rate between the two groups (83.0% in Group 1 and 82.7% in Group 2). However, Group 2 showed a significantly higher rate of postoperative complications than Group 1. In Group 1, 5/59 (8.4%) eyes had ocular irritation, 2/59 (3.4%) eyes exhibited tube prolapse, conjunctivitis, corneal erosion, and dacryocystitis and 1/69 (1.6%) eyes had a punctal slit after intubation. In Group 2, 3/29 (10.3%) eyes had ocular irritation, 2/29 (6.9%) eyes exhibited tube prolapse, conjunctivitis, a punctal slit, and dacryocystitis, and 1/29 (3.4%) eyes showed corneal erosion, or a granuloma after intubation. A recurrence of symptomatic tearing was found in 6/59 (10%) eyes in Group 1 and 3/29 (10%) in Group 2. Conclusions: In silicone tube intubation of incomplete NLD obstruction, the usage of silicone silastic sheets to tie both ends of the silicone tube produced a lower complication rate and a higher success rate than that of the suture knot group. Lower tension on the nasolacrimal passage in the silicone silastic sheet group allows for a significantly lower rate of punctal slit development. Therefore, the method of using silicone silasitic sheets can be considered useful in the treatment of NLD obstruction.

수포성 각막병증의 공초점주사현미경 소견

박영민,권한조,이종수,Young Min Park,Han Jo Kwon,Jong Soo Lee 대한안과학회 2013 대한안과학회지 Vol.54 No.12

Purpose: To analyze the morphology and density of corneal tissue in patients with bullous keratopathy using in vivo confocal microscopy (IVCM).<br /> Case summary: Four eyes of 4 patients with clinically diagnosed bullous keratopathy were examined using IVCM. Cross-sectioned corneal images of the corneal epithelium, Bowman’s layer, stromal layer, Descemet’s membrane, and endothelium were evaluated. In bullous keratopathy patients, the outline of corneal epithelial wing cells was blurred. Several hyper-reflective whitish dots were found at the corneal epithelial level and a reduction in the density and thickness of the corneal nerves was observed. There was also a reduction in the density of the stromal keratocytes. The outline of the stromal keratocytes was blurred. Some keratocytes resembled myofibroblast. The hypo-reflective vertical strands were observed in the stroma adjacent to the Descemet’s membrane. Endothelium showed hyper-reflectivity with associated increased endothelial pleomorphism and polymegathism.<br /> Conclusions: In patients with bullous keratopathy, IVCM showed tissue edema in the corneal epithelium, stroma, and endothelium. Hyper-reflectivity appearances were noted due to the increase in the metabolic rate of the cells or extracellular matrix accumulation. Corneal endothelium showed morphological changes.<br /> J Korean Ophthalmol Soc 2013;54(12):1923-1928

SOC민간투자사업의 투자수익률에 관한 연구

박영민,김수용,김기영,Park Young-Min,Kim Soo-Yong,Kim Ki-Young 한국건설관리학회 2004 건설관리 : 한국건설관리학회 학회지 Vol.5 No.6

정부는 재정 부담을 완화하면서 인프라를 구축할 수 있는 SOC민간투자사업제도를 도입하여 적극 장려하고 있다. 민간투자사업의 비중은 2003년을 기준으로 전체 SOC투자 중 $11\%$에 이를 만큼 비중이 크게 성장 하였으며 이와 같은 성장세는 당분간 지속될 것으로 판단된다. 하지만 민간투자사업에 참여하고 있는 사업자를 살펴보면 시공수익을 기대하는 시공사들이 전체 투자자의 $80\%$이상을 차지하고 있고, 은행, 보험, 연 $\cdot$ 기금 등의 재무적 투자자는 $3\%$ 수준에 그치고 있는 실정으로 민간투자사업의 효율적인 운영에 장애가 되고 있다. 그러므로 향후 지속적인 민간투자사업의 발전을 위해서는 투자재원을 다변화해야 할 것으로 판단되며, 이를 위해서는 사회적으로 합의된 적정 수준의 투자수익률이 우선적으로 제시 되어야 할 것이다. 따라서 본 연구에서는 재무적 투자자의 참여 활성화를 위한 적정 수준의 투자수익률을 제시하기 위하여 민간투자사업의 수익률과 관련한 이론을 살펴보고, 다양한 분석 방법을 통하여 국내 상황에 맞는 SOC민간투자사업의 투자수익률 수준을 제시하였다. Present private infrastructure investment in SOC investment has increased up to $11\%$ compared to the year 2003 and it is expected to increase in the future. In spite of its rapid increasement we don't have definite standard or system on distinctly presented rate of return for domestic private infrastructure investment yet, and practical and scientific research is not sufficient, compared to its necessity and importance. Hence, in this study we tried to build theories systematically, which are related to rate of return of private infrastructure investment to promote SOC private infrastructure investment to last successfully and present the proper level of rate of return of private infrastructure we investment appropriate in domestic situations through diverse analysis. Therefore, to present reasonable rate of return, we used 5 methods: existing research analysis, case study, financial index analysis, analysis of investors rate of return, and analysis of rate of return in a real estate market. After comparing and analyzing these methods, Ive presented in the end the appropriate level of rate of return of private infrastructure investment, which can be applied in a domestic market.

수면, 자살, 세로토닌의 상호 관련성

박영민,Park, Young-Min 대한수면의학회 2013 수면·정신생리 Vol.20 No.1

One of hypothesis is that sleep loss related to a decrease in serotonergic activity plays a significant role in attempted suicide. A growing evidence suggests that central serotonergic activity plays a key role in the etiology of suicide. It has been reported that the cerebrospinal fluid (CSF) levels of 5-hydroxyindoleacetic acid (5-HIAA), the main metabolite of serotonin, were reduced in suicide attempters. In addition, there is evidence that tryptophan hydroxylase is associated with suicide. The association between sleep and suicide was also suggested by some researchers. Several recent studies have showed the association between sleep disturbance and suicide rates in patients with mental disorders and in a general population. In addition, it has been suggested that serotonin plays a role in maintaining arousal and regulating muscle tone and in regulating some of the phasic events of REM sleep. Especially, it is well-known that 5-HT2 receptors are related to slow wave sleep. In conclusion, it is clear that sleep, serotonin activity, and suicide are linked, although the direction of causation needs clarification. In future, large population-based cohort studies are needed to demonstrate the direction of causation in the relationships between sleep, serotonin activity, and suicide.

수면 관련 식이 장애

박영민,Park, Young-Min 대한수면의학회 2011 수면·정신생리 Vol.18 No.1

Sleep-related eating disorder (SRED) is a newly recognized parasomnia that describes a clinical condition of compulsive eating under an altered level of consciousness during sleep. Recently, it is increasingly recognized in clinical practice. The exact etiology of SRED is unclear, but it is assumed that SRED might share features of both sleepwalking and eating disorder. There have been also accumulating reports of SRED related to the administration of various psychotropic drugs, such as zolpidem, triazolam, olanzapine, and combinations of psychotropics. Especially, zolpidem in patients with underlying sleep disorders that cause frequent arousals, may cause or augment sleep related eating behavior. A thorough sleep history is essential to recognition and diagnosis of SRED. The timing, frequency, and description of food ingested during eating episodes should be elicited, and a history of concurrent psychiatric, medical, sleep disorders must also be sought and evaluated. Interestingly, dopaminergic agents as monotherapy were effective in some trials. Success with combinations of dopaminergic and opioid drugs, with the addition of sedatives, has also been reported in some case reports.