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황재연,윤혜경,김위경,조영아,이진성,윤종현,이연주,김경모 대한초음파의학회 2014 ULTRASONOGRAPHY Vol.33 No.3
Purpose: To assess the feasibility and effectiveness of transperineal ultrasonography (TPUS) forthe evaluation of perianal Crohn disease (PCD) in pediatric patients. Methods: Between September 2010 and August 2013, 64 TPUS examinations were performedin 43 patients (34 males and 9 females; mean age±standard deviation, 13.3±2.4 years; agerange, 6 to 17 years) to evaluate PCD. The pain severity, location, and activity of perianal fistula,the presence of an abscess, and anal canal hyperemia were retrospectively evaluated. Spearmanrank correlation analysis was performed to assess the relationship between the severity of thepain and the fistula activity, the presence of an abscess, and anal canal hyperemia. Results: All examinations were successfully performed. Thirty-nine examinations (60.9%) wereperformed without any pain experienced by the patient, 19 examinations (29.7%) with mildpain, five examinations (7.8%) with moderate pain, and one examination (1.6%) with severepain. The pain severity was correlated with the fistula activity (P<0.01). An anterior fistulalocation was more common than a posterior location. Active fistulas and abscesses wereidentified during 30 examinations (46.9%) and 12 examinations (18.8%), respectively. Analcanal hyperemia was identified in 31 examinations (48.4%). Conclusion: TPUS with a color Doppler study is useful for visualizing a perianal fistula or abscessand for assessing its inflammatory activity in pediatric Crohn patients.
황재연,조신형,박신형 대한교통학회 2023 대한교통학회 학술대회지 Vol.88 No.-
대중교통은 교통 혼잡과 대기 오염, 개인 차량에 대한 의존도를 낮추는 매우 훌륭한 교통 수단으로 자리 잡아왔다. 하지만 대중교통 시설은 경제성, 효율성을 중심으로 노선을 수립하여 지역적인 서비스 수준의 격차가 심화되고 있다. 본 연구에서는 지역간 발생하고 있는 대중교통의 불균형을 평가하기 위하여 대중교통과 택시를 활용한 대중교통 수단경쟁력을 분석하는 지표를 제안하고자 한다. 분석을 위해 스마트카드 데이터와 택시 데이터를 활용하였고, 분석 지표에는 대중교통의 이동성과 운행시간, 환승시간, 운행비율을 고려하여 산출하였다. 분석 결과로 일반적인 생각과 비슷하게 대중교통의 이동성보다 택시의 이동성이 높게 나왔으며, 거리가 멀어짐에 따라 대중교통의 수단경쟁력이 택시와 비슷해졌으며 비슷해졌으며, 이러한 결과값은 택시가 장거리 운행일수록 교통량의 영향을 더 많이 받으므로 추정할 수 있다.
스마트카드와 택시 데이터를 활용한 교통 이동성 지표 개발
황재연,박신형,조신형 한국도로학회 2023 한국도로학회논문집 Vol.25 No.2
PURPOSES : This study proposes an index for analyzing mobility based on smartcard and taxi data to evaluate imbalances in public transit. METHODS : The proposed mobility index is calculated based on the difference between the mobility indexes of public transit and taxis using the variables of the in-vehicle time, waiting time, and driving ratio. For a more detailed analysis, the distances are divided into short distances, medium distances, and long distances. RESULTS : Public transit mobility indexes are generally evenly distributed, but the taxi mobility indexes are located in the largest legend. When comparing the respective mobilities of public transit and taxis, many areas with a high mobility of taxis (similar to the distribution) exist, especially in the outskirts such as Dobong-gu, Nowon-gu, Gangdong-gu, Guro-gu, Geumcheon-gu, and Eunpyeong-gu. On average, the mobility of public transit according to the distance is smaller in a short distance and higher in a long distance. CONCLUSIONS : The results demonstrate the use of the proposed index for analyzing the basic statuses of complementary indexes for evaluating public transit imbalances. In the future, more detailed results (including socioeconomic variables corresponding to the grid areas) should be studied to identify the impacts of the mobility index.
황재연,정진원,조병수,조택연 대한건축학회 1999 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.19 No.1
The pattern of urban improvement blindly followed the logic of two-dimensional land utilization without being informed of the three-dimensional relationship between buildings and the urban external space, nor of the complexity of human behavior. As a result, the quality of both the urban external space has been severely compromised. The design proposed here is formulated though a definition the basic of the city as an organism. By means of the symbiosis theory which outline the basic order of the ecosystem including human beings, this design attempts to relate more closely buildings to the three-dimensional spaces. This design attempts to provide a way to recover the vitality of the city. This design of a shows the application of a computer program and the regular polyhedral transformation which is one of the organization principles in the realm of nature.
황재연,신지훈,김용희,이연주,송호영,김진형 대한영상의학회 2013 대한영상의학회지 Vol.68 No.6
Anterior mediastinal tracheostomy (AMT) is performed to establish an airway after resection of advanced tumors in the cervicothoracic region. We report a case of successful placement of a covered retrievable self-expandable nitinol stent for a stoma stricture that developed after AMT in a patient with adenoid cystic carcinoma of the trachea. Two stent placements and removals, at two and three months after their initial placement, were performed due to loosening of the stents. Although we did not achieve long-term results as the patient died of massive hemorrhage, the stent placement was both feasible and safe, thus suggesting that temporary stent placement may be a valuable option for treating stoma stricture occurring after AMT.