Fabrications f Polymer Nanofibers by Electrospining Technique and its Application to Dye-Sensitized Solar Cells

김지언,이승엽,박성해,김미라,이진국 한국고분자학회 2007 한국고분자학회 학술대회 연구논문 초록집 Vol.2007 No.10

Experiences of Tracheal Procedure Assisted by Extracorporeal Membrane Oxygenator

김지언,정성호,마대성 대한흉부외과학회 2013 Journal of Chest Surgery Vol.46 No.1

We report on the application of a venovenous type extracorporeal membrane oxygenator (ECMO) in high-risk tracheal procedures in six cases consisting of five patients with tracheal stenosis. An ECMO should be helpful for preventing respiratory emergency during a tracheal procedure.

2018 International Investigative Dermatology 참관기

김지언 한국피부장벽학회 2018 한국피부장벽학회지 Vol.20 No.1

Gender-specific risk factors for suicidal ideation among adolescents in urban Paraguay during the COVID-19 pandemic: A baseline survey

김지언,남은우 한국보건교육건강증진학회 2024 보건교육건강증진학회지 Vol.41 No.2

. Objectives: This study aims to investigate the factors contributing to suicidal ideation among Paraguayan adolescents during the COVID-19 pandemic, focusing on sex differences. The study seeks to provide valuable insights for targeted suicide prevention education interventions tailored to adolescents’ needs. Methods: The study utilized stratified random sampling involving 12,146 adolescents aged 13-16 from 21 health promotion schools in Limpio, Paraguay. A total of 567 participants completed a survey through face-to-face interviews. Data analysis was conducted using binary logistic regression, with suicidal ideation in the past 12 months as the dependent variable, and socio-demographic, psychological, health behavior, violence, and supportive factors independent variables. Results: Overall, 17.6% of boys and 32.2% of girls reported experiencing suicidal ideation in the last 12 months. Factors such as depression and loneliness were significant factors of suicidal ideation among boys, while girls were significantly affected by their BMI, depression, loneliness, alcohol and drug use, bullying experiences, and parental understanding. Conclusion: While school health policies have traditionally focused on physical health, the COVID-19 pandemic underscores the importance of a comprehensive approach that addresses mental health as well. Developing intervention programs that encompass both mental and physical health and take into account cultural considerations can promote equity and prevent adolescent suicide.

내측측두엽 간질환자에서의 측위증후

김지언 啓明大學校 醫科大學 1997 계명의대학술지 Vol.16 No.4

저자는 약물에 반응하지 않는 내측측두엽간질로 진단받고 간질수술을 시행받은후 1년이상 추적관찰하여 간질발적빈도가 술전에 비해 90%이상 감소되었거나 또는 완전히 소실된 환자 35명을 대상으로 180회의 간질발작의 징후를 CCTV를 통한 비디오로 분석하여 다음과 같은 결론을 얻었다. 1. 간질유발병소를 추정하는데 가장 도움이 되는 측위증후는 병변과 동측의 자동증과 함께 반대편의 이긴장성자세가 관찰되는 경우(87%)였으며, 그 다음이 병변위치와 반대편의 이긴장성 자세가 단독으로 나타나는 경우(75%), 병변과 동측의 자동증만 나타나는 경우(70%)였다. 2. 두부회전은 처음부터 병변의 반대측으로 회전하는 경우보다 처음에는 동측으로 회전하였다가 다시 반대편으로 회전하는 경우가 더욱 측방성의 가치가 높았다. Various signs of lateralization have been described in temporal lobe epilepsy (TLE). They include unilateral automatism, unilateral dystonic posture, versive head and body turning, ictal speech and so on. Because their specificity is still unclear, they are used to a limited degree in lateralizing the side of ictal onset. We evaluate the value of lateralizing signs in patients with TLE. We analyzed semiology of 180 seizures in 35 TLE patients who were evaluated for epilepsy surgery at Dongsan Epilepsy Center between November, 1992 and October, 1995. All patients had received epilepsy surgery, and they were seizure free or exhibited aura only for at least 12 months following surgical resection. Unilateral dystonic posture alone was observed in 22 seizures [ipsilateral : 6(25%), contralateral: 16(75%)]. Unilateral hand automatism alone was observed in 33 seizures [ipsilateral: 23(70%), contralateral: 10(30%)]. Unilateral dystonic posture accompanied by automatism of the other side was observed in 56 seizures [ipsilateral automatism combined with contralateral dystonic posture : 48(87%), contralateral automatism combined with ipsilateral dystonic posture: 7(13%)]. Versive head turning was noticed in 35 enents [ipsilateral 4(11%), contralateral: 22(63%), initial ipsilateral to contralateral : 9(26%), initial contralateral to ipsilateral: 0]. We conclude that the most valuable lateralizing sign in TLE is contralateral dystonic posture accompanied by ipsilateral automatism, and ipsilateral hand automatism alone and contralateral dystonic posture alone are also significant.

Surgical Outcomes of Congenital Atrial Septal Defect Using da VinciTM Surgical Robot System

김지언,정성호,김관식,김준범,주석중,정철현,이재언 대한흉부외과학회 2013 Journal of Chest Surgery Vol.46 No.2

Background: Minimally invasive cardiac surgery has emerged as an alternative to conventional open surgery. This report reviews our experience with atrial septal defect using the da VinciTM surgical robot system. Materials and Methods: This retrospective study included 50 consecutive patients who underwent atrial septal defect repair using the da VinciTM surgical robot system between October 2007 and May 2011. Among these, 13 patients (26%) were approached through a totally endoscopic approach and the others by mini-thoracotomy. Nineteen patients had concomitant procedures including tricuspid annuloplasty (n=10), mitral valvuloplasty (n=9), and maze procedure (n=4). The mean follow-up duration was 16.9±10.4 months. Results: No remnant interatrial shunt was detected by intraoperative or postoperative echocardiography. The atrial septal defects were mainly repaired by Gore-Tex patch closure (80%). There was no operative mortality or serious surgical complications. The aortic cross clamping time and cardiopulmonary bypass time were 74.1±32.2 and 157.6±49.7 minutes, respectively. The postoperative hospital stay was 5.5±3.3 days. Conclusion: The atrial septal defect repair with concomitant procedures like mitral valve repair or tricuspid valve repair using the da VinciTM system is a feasible method. In addition, in selected patients, complete port access can be helpful for better cosmetic results and less musculoskeletal injury.

무지개 색의 특성과 복식으로 전달되는 이미지

김지언,김영인 한국복식학회 2004 服飾(복식) Vol.54 No.6

The rainbow has been considered as a perfect representative of color harmony in nature. In this study rainbow's colors include seven spectral colors and changeable colors according to observational angle. This study performed a bibliographical inquiry into rainbow colors and the survey research for classification of rainbow color images in fashion design. First, a bibliographical inquiry includes the definition of rainbow colors, physical formation principles of the rainbow, and its aesthetical attributes and symbolism. Second, this survey classifies rainbow color images in fashion design. The results of this study are as follows: 1. The rainbow was the religious and symbolic object before 17th century, and after that period, the rainbow became an aesthetical object. The main symbolic meanings are similar in eastern and western culture: temporary bridge between two world, divine nature, hope/beauty/richness, war/ death/flood/drought. 2. This survey shows that 6 main factors of rainbow color images in fashion design are 'vigorous', 'colorful'. 'fairy', 'fresh', 'mysterious', 'brilliant'. Rainbow color image in fashion design shows past and futuristic image at the same time. The purpose of this study is to systematized the images theoretical bases which are applied to color expression and of rainbow colors and to find out the development about rainbow theme by designers.

레이저 클리닝 기술을 통한 용접부 후처리시 용접부 형상에 따른 특성 연구

김지언,김평수,이종명,최한섭,김종도 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5

우수한 내식성으로 여러 산업군에서 사용되는 스테인리스 강재는 제품의 조립시 용접성 또한 양호한 재료로 알려져 있다. 하지만, 용접 공정 특히, 아크 용접 후에는 용접부의 실드가 충분하지 않을 경우 용접부 표면에 넓은 산화층이 형성된다. 이러한 산화층은 제품의 품질을 저하시킬 뿐만 아니라 후공정에 의한 작업시간이 증가하는 문제를 야기한다. 특히 최근 산업현장에서 용접부 후처리 과정에서 발생하는 2차 폐기물에 의한 환경오염 문제도 큰 이슈가 되고 있다. 이와 같은 문제를 해결하기 위하여 스테인리스강의 아크 용접부 표면에 친환경 레이저 클리닝 기술을 적용하고자 하였다. 대표적으로 맞대기 및 필릿 용접된 시험편을 제작하여 용접부 형상에 따른 레이저 클리닝 특성을 연구하였다. 결과적으로, 레이저 클리닝부의 재료학적 분석을 통해 용접부 표면의 불균일한 산화층이 효과적으로 제거되었음을 확인하였다.

영동대설 사례와 관련된 동해상의 현열속과 잠열속 분포 특성

김지언,권태영,이방용 한국해양과학기술원 2005 Ocean and Polar Research Vol.27 No.3

To investigate the air mass modification related with Yeongdong heavy snowfall events, we examined sensible and latent heat fluxes on the East Sea, the energy exchange between atmosphere and ocean in this study. Sensible and latent heats were calculated by a bulk aerodynamic method, in which NCEP/NCAR reanalysis data and NOAA/AVHRR weekly SST data with high resolution were used. Among winter precipitation events in the Yeongdong region, 19 heavy precipitation events (1995~2001) were selected and classified into three types (mountain, cold-coastal, and warm types). Mountain-type precipitation shows highly positive anomalies of sensible and latent heats over the southwestern part of the East Sea. When separating them into the two components due to variability of wind and temperature/specific humidity, it is shown that the wind components are dominant. Cold-coastal-type precipitation also shows strong positive anomalies of sensible and latent heats over the northern part and over the central-northern part of the East Sea, respectively. It is shown that the sensible heat anomalies are caused mostly by the decrease of surface air temperature. So it can be explained that cold-coastal-type precipitation is closely related with the air mass modification due to cold air advection over warm ocean surface. But in warm-type precipitation, negative anomalies are found in the sensible and latent heat distributions. From this result, it may be postulated that warm-type precipitation is affected by the internal process of the atmosphere rather than the atmosphere-ocean interaction.

수중음파 센서네트워크를 위한 계층별 프로토콜의 설계 및 성능 평가

김지언,윤남열,김영표,신수영,박수현,전준호,박성준,김상경,김창화,Kim, Ji-Eon,Yun, Nam-Yeol,Kim, Yung-Pyo,Shin, Soo-Young,Park, Soo-Hyun,Jeon, Jun-Ho,Park, Sung-Joon,Kim, Sang-Kyung,Kim, Chang-Hwa 한국시뮬레이션학회 2011 한국시뮬레이션학회 논문지 Vol.20 No.4

최근 수중 환경 모니터링 시스템에 대한 관심이 높아지면서 수중음파센서네트워크에 관련된 연구가 활발히 진행되고 있다. 수중음파센서네트워크는 수중환경 모니터링, 수중자원탐사, 해양 데이터 수집, 군사 목적 등 다양한 분야에 활용되고 있다. 이러한 다양한 분야에서 활용 가능한 수중음파센서네트워크의 활성화를 위해서는 PHY-MAC 프로토콜의 정의가 필수적이다. 하지만, 수중음파센서네트워크는 제한된 대역폭, 다중경로 및 페이딩현상, 지상 무선통신에 비해서 낮은 음파 속도로 인한 전송 지연시간 등 수중환경의 특수성에 고려해서 구현을 해야 한다. 본 논문에서는 수중환경과 관련된 제약사항을 고려하여 적응적인 PHY 프로토콜의 주파수, 네트워크 토폴로지, MAC 프로토콜, PHY-MAC 인터페이스, 데이터 프레임 포맷을 정의하고, 구현한 시스템의 구성에 대해서 설명하며, 수중환경에서의 실제 실험을 통한 데이터를 기반으로 성능 평가를 하였다.