한국인에 있어서 결절맥락막혈관병증의 역학과 임상소견

이지웅,김인택,Ji Woong Lee,In Taek Kim 대한안과학회 2007 대한안과학회지 Vol.48 No.1

Purpose: To investigate the incidence, demographic features and clinical characteristics of polypoidal choroidal vasculopathy (PCV) in Korean patients. Methods: We retrospectively reviewed the medical records of 413 patients (485 eyes) diagnosed with choroidal neovascularization in exudative age-related macular degeneration between June 2001 and September 2005. All patients underwent complete ophthalmologic examination, fluorescein and indocyanine green angiography, and optical coherence tomography. Results: Among a total of 485 eyes of 413 patients, 80 eyes of 66 patients (16.5%) were diagnosed with PCV. Men were predominantly affected (80.3%), and most patients were elderly with a mean age of 68.3 years (range, 50~93 years) and unilaterally involved (78.8%). The polypoidal lesions in PCV tended to be located in the macula area (62.5%). With respect to vascular network, fine vascular networks were observed in 51 eyes (63.7%) and large lesions were present in 16 eyes (20.0%). Clusters of grape-like polypoidal lesions (60%) were more common than solitary aneurysmal dilations (35.0%). Branching choroidal vessels were present in 67 eyes (83.7%) and absent in 13 eyes (16.3%). Optical coherence tomographic images of polypoidal lesions in 53 eyes showed uneven surfaces with more sharply peaked shapes different from those seen in the serous pigment epithelial detachment in age-related macular degeneration and central serous chorioretinopathy. Conclusions: The incidence of PCV in Korean patients was relatively high among various ethnic groups. Although the demographic and clinical features of PCV in Korea differed from Caucasian patients, they were similar to Japanese and Chinese patients.

소아 신장이식 후 성장에 대한 평가

이지웅,김정수,김양욱,김영훈,윤영철,정우영,Lee, Ji-Woong,Kim, Jung-Soo,Kim, Yang-Wook,Kim, Young-Hoon,Yoon, Young-Chul,Chung, Woo-Yeong 대한소아신장학회 2006 Childhood kidney diseases Vol.10 No.2

Purpose : We aim to identify the clinical and demographic characteristics in children who underwent renal transplantation(RTx) and to evaluate the influence on growth of RTx in children. Methods : We reviewed 17 medical records of chronic renal failure patients who underwent RTx from April 1992 and June 2004 at Busan Paik Hospital. Age and sex distribution, cause of disease, donor analysis, patient and graft survival rate, and the status of growth after RTx were analysed by retrospective study. Results : Eighteen RTx were performed in 17 patients(8 boys, 9 girls). The mean age at the time of RTx was $15.8{\pm}3.5$ years and the mean duration of dialysis therapy before RTx was $22.4{\pm}18.0$ months. The 1 year and 5 year patient survival rate were each 100%, and the 1 year and 5 year graft survival rate were 88%, 36% respectively. The most common cause of graft failure was chronic rejection. The mean final height of male patients was $162.8{\pm}10.0$ cm(143.0-172.5 cm) and of female patients was $154.5{\pm}12.1$ cm(135.8-160.0 cm). The mean height standard deviation score(Ht SDS) increased after RTx from -1.95 to -1.53 but the increment rate was not statistically significant. Similar changes were noted in individual patient analysis. Also there was no significant difference between the living-related donors and cadaveric donors. Conclusion : Our data shows that even successful RTx rarely results in full growth rehabilitation. To overcome retarded growth in children with chronic renal failure, appropriate combined management of metabolic and nutritional problems, correction of anemia, proper use of recombinant growth hormone therapy, early renal transplantation and shortening of the duration of dialysis would be necessary.

경결막무봉합유리체절제술 후 발생한 안내염 1예

이지웅,김동주,신재필,김시열,Ji Woong Lee,M,D,Dong Ju Kim,M,D,Jae Pil Shin,M,D,Si Yeol Kim,M,D 대한안과학회 2007 대한안과학회지 Vol.48 No.1

Purpose: To report a case of endophthalmitis after 25-gauge transconjunctival sutureless vitrectomy. Methods: A 60-year-old male patient underwent 25-gauge transconjunctival sutureless vitrectomy through the epiretinal membrane. He was diagnosed as endophthalmitis on 7th postoperative day. Immediate vitrectomy and intravitreal antibiotics injection was done. Results: Coagulase-negative staphylococcus was identified in vitreous culture and incarcerated vitreous through the previous unsutured sclerotomies were found. During vitrectomy, we found generalized retinal necrosis and vascular occlusion with retinal hemorrhage, cheese like thick membrane firmly adherent to the retina due to inflammatory response. The organism was sensitive to antibiotics administered. After treatment, inflammatory response was controlled and the retina became stable but the visual outcome was poor. Conclusions: Vitreous incarceration through unsutured sclerotomy may occur after 25-gauge transconjunctival sutureless vitrectomy. This can be a possible conduit for bacteria in the eye and be a cause of endophthalmitis. Sutureless sclerotomy should be carefully monitered and managed postoperatively.

초로기와 노년기 입원환자에 대한 정신건강의학과 자문의 특성

이지웅,전진숙,김강률,김현석,오병훈,Lee, Ji Woong,Cheon, Jin Sook,Kim, Kang Ryul,Kim, Hyun Seuk,Oh, Byoung Hoon 한국정신신체의학회 2013 정신신체의학 Vol.21 No.2

연구목적 타과 입원 중 정신건강의학과에 자문 의뢰된 초로기와 노년기 환자의 특징에는 어떠한 차이가 있는지 알아보기 위하여 연구를 실시하였다. 방 법 일 대학병원 정신건강의학과에 자문 의뢰된 타과 입원환자 중 50세부터 64세 범위의 초로기 환자(N=162)와 65세 이상의 노년기 환자(N=171)의 자문기록지를 비교분석하였다. 결 과 1) 정신건강의학과 자문의 주소는 초로기에 신체증상, 불안, 수면장애 순, 노년기에 인지저하, 의식혼탁, 우울한 기분 순으로 많았다. 2) 자문 결과에 의한 정신의학적 진단명은 초로기에 섬망, 기분장애, 물질사용장애순, 노년기에 섬망, 기분장애, 주요 신경인지장애 순으로 많았다. 3) 신체질환 치료제의 수는 초로기보다 노년기에 더 많았다. 결 론 정신건강의학과 자문의 특성은 초로기와 노년기 환자에서 차이가 있었으므로, 노인정신의학 자문 활동에 있어서 더욱 세분화된 노인 연령층별 접근이 필요하다고 제시된다. Objectives: The aim of this study was to know differences of characteristics between presenile and senile patients who were consulted to the department of psychiatry during medical-surgical admission. Methods: The demographic and clinical data obtained from the medical records of psychiatric consultation in the presenile inpatients with age 50 to 64 years(N=162) and those of the senile inpatients with age over 65 years(N=171) were reviewed and compared. Results: 1) The most common chief complaints for psychiatric consultation in presenile patients were somatic symptoms, anxiety and sleep disturbance in order, while cognitive decline, clouded consciousness and depressed mood were most common in senile patients with statistical significance. 2) The most frequent psychiatric diagnoses after consultation in presenile patients were delirium, mood disorder and substance use disorder in order, while delirium, mood disorder and major neurocognitive disorder were most frequent in senile patients with statistical significance. 3) There were no significant difference in numbers of physical illnesses, while numbers of therapeutic drugs for them were more in senile patients. Conclusions : Our study found significant differences between presenile and senile patients on psychiatric symptoms and diagnoses in geropsychiatric consultation. Therefore, more subdivided age-specific approach seems to be needed for the geropsychiatric consultation activities.

고온에 노출된 철근콘크리트 기둥의 거동 해석

이지웅(Lee, Ji-Woong),홍성걸(Hong, Sung-Gul) 한국콘크리트학회 2003 한국콘크리트학회 학술대회 논문집 Vol.2003 No.11

안전관리체계(SMS)기반의 철도종합안전심사 방안에 관한 연구

이지웅(Lee Ji Woong),이종석(Lee Jong Seock),박홍규(Park Hong Kyu),김만웅(Kim Mhan Woong) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.10

상품 리뷰 분석을 위한 텍스트 마이닝 기법의 비교

이지웅 ( Ji-woong Lee ),진영택 ( Young-taek Jin ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.2

오늘날 정보화 시대에서는 온라인 쇼핑의 상품리뷰 등 대용량의 텍스트 문서가 존재하며 제품에 대한 정서적인 의견뿐만 아니라 제품 선호도 및 상품 비교와 같은 유용한 정보를 제공한다. 본 논문에서는 사용자가 작성한 상품 리뷰로부터 제품의 특성을 비교하는 비교의견을 추출하기 위해 적용한 다양한 텍스트 마이닝 기법의 비교 결과를 제시한다.

웨이블릿 변환을 이용한 적응형 코드북 탐색시간의 개선

이지웅(Ji-Woong Lee),나훈(Hoon Na),정대권(Dae-Gwon Jeong) 한국통신학회 1999 한국통신학회 학술대회논문집 Vol.1999 No.11

CELP 부호화기의 코드북 탐색 시간 개선

이지웅(Ji Woong Lee),나훈(Hoon Na),정대권(Dae Gwon Jeong) 한국항행학회 2000 韓國航行學會論文誌 Vol.4 No.1

This paper proposes a reduction scherme for codebook search time in the adaptive codebook using wavelet transformed coefficients. In a CELP coder, pitch estimation with a combined open loop and closed loop search in adaptive codebook needs a lengthy search. More precisely, the pitch search using autocorrelation function over all possible ranges has been shown inefficient compared to the consuming time. In this paper, we propose a new adaptive codebook search algorithm which ensures the same position for the pitch with maximum wavelet coefficient over various scaling factors in Dyadic wavelet transform. A new adaptive codebook search algorithm reduces 25% conventional search time with almost the same quality of speech.

해외 정량적 위험도관리모델의 국내 적용성 검토

이지웅(Lee Ji Woong),김만웅(Kim Mhan Woong),장윤석(Chang Yun Suk) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월

As the risk assessment of railway is now regarded as the important issue in Korea, every railway operator and facilities manager should perform the risk assessment when they start to manufacture and/or construct the railway system. In 2001, RSSB in UK developed the Safety Risk Model(SRM) which could quantify the total risk of UK mainline railway and also provided the risk profile and the result of risk model to the stakeholders to reduce their own risk. SRM provides a structured representation of the causes and consequences of potential accidents arising from railway operations and maintenance. This paper analyses the structure of SRM, risk assessment process & results, and the method of using the SRM output for train operator. We suggest the details of considerations when the domestic train operator try to perform the quantitative risk assessment and make the risk model.