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양승부,최교창,이상진,정영진,임한혁,한효상,황인철,조환성 순천향의학연구소 2005 Journal of Soonchunhyang Medical Science Vol.11 No.1
Objective : Our purpose of this study is to evaluate the effectiveness of the transcatheter arterial embolization for the management of abnormal uterine bleeding. Materials and Methods : 14 patients with massive or recurrent uterine bleeding underwent percutaneous transcatheter arterial embolization between February 2003 and September 2004. We reviewed 14 cases of uterine artery or internal iliac artery embolization using gelfoam or PVA particles. Results : Good management of uterine bleeding was achieved in 13 of 14(93%) cases. The cause of abnormal uterine bleeding was myoma(5 case), post D & E bleeding(3), acquired vascular malformation(3), pseudoaneurysm(1), adenomyosis(1), and endometrial hyperplasia(1). Conclusion : Transcatheter artery embolization is an effective and life-saving procedure in massive or recurrent uterine bleeding. Early diagnosis and prompt transcatheter arterial embolization is a useful mangement of uterine bleeding.
Comparison of Different Microanastomosis Training Models : Model Accuracy and Practicality
Hwang, Gyo-Jun,Oh, Chang-Wan,Park, Sukh-Que,Sheen, Seung-Hun,Bang, Jae-Seung,Kang, Hyun-Seung The Korean Neurosurgical Society 2010 Journal of Korean neurosurgical society Vol.47 No.4
Objective : The authors evaluated the accuracies and ease of use of several commonly used microanastomosis training models (synthetic tube, chicken wing, and living rat model). Methods : A survey was conducted among neurosurgeons and neurosurgery residents at a workshop held in 2009 at the authors' institute. Questions addressed model accuracy (similarity to real vessels and actual procedures) and practicality (availability of materials and ease of application in daily practice). Answers to each question were rated using a 5-point scale. Participants were also asked what types of training methods they would chose to improve their skills and to introduce the topic to other neurosurgeons or neurosurgery residents. Results : Of the 24 participants, 20 (83.3%) responded to the survey. The living rat model was favored for model accuracy (p<0.001; synthetic tube $-0.95{\pm}0.686$, chicken wing, $0.15{\pm}0.587$, and rat, $1.75{\pm}0.444$) and the chicken wing model for practicality (p<0.001; synthetic tube $-1.55{\pm}0.605$, chicken wing, $1.80{\pm}0.523$, and rat,$1.30{\pm}0.923$). All (100%) chose the living rat model for improving their skills, and for introducing the subject to other neurosurgeons or neurosurgery residents, the chicken wing and living rat models were selected by 18 (90%) and 20 (100%), respectively. Conclusion : Of 3 methods examined, the chicken wing model was found to be the most practical, but the living rat model was found to represent reality the best. We recommend the chicken wing model to train surgeons who have mastered basic techniques, and the living rat model for experienced surgeons to maintain skill levels.
S-187 Prognostic value of Neutrophil to Lymphocyte Ratio in Patients with STEMI
( Moon-seung Soh ),( Jin-sun Park ),( Kyoung-woo Seo ),( Hyoung-mo Yang ),( Hong-seok Lim ),( Byoung-joo Choi ),( So-yeon Choi ),( Myeong-ho Yoon ),( Gyo-seung Hwang ),( Seung-jea Tahk ),( Joon-han Sh 대한내과학회 2016 대한내과학회 추계학술대회 Vol.2016 No.1
Background:?The ratio between the absolute number of neutrophils and the number of lymphocytes (NLR) has recently emerged as a potential new biomarker predicting worse clinical conditions ranging from infectious disease to cardiovascular disease. Prognostic significance of NLR in patients with ST-elevation myocardial infarction (STEMI) is not established. This study aimed to investigate prognostic impact of NLR in patients with STEMI.?Methods:?We analyzed the data and clinical outcomes of 30-day survivors with STEMI who received successful coronary intervention from 2003 to 2005. NLR was computed from the absolute values of neutrophils and lymphocytes from the complete blood count at admission. Occurrence of major adverse cardiovascular events (MACE; death, recurrent MI, target vessel revascularization (TVR)) within 10 years was evaluated.?Results:?We enrolled 326 patients and mean follow-up duration was 68±36 months. The mean NLR was 4.7±5.2. Among all patients, all-cause mortality occurred in 46 patients (14%). Initial NLR was higher in patients who experienced all-cause mortality (6.39±8.9 vs. 4.2±3.1, p=0.004) In a multivariate regression model, the higher NLR was independently associated with increased risk for all-cause mortality (OR, 1.085; 95% CI, 1.002-1.174, p=0.044, Table 1).?Conclusions:?Increased NLR was associated increased rate of all-cause mortality in 30-day survivors after index STEMI, who received successful coronary intervention.
Surgical Obliteration in Superior Petrosal Sinus Dural Arteriovenous Fistula
Hwang, Gyo-Jun,Kang, Hyun-Seung,Oh, Chang-Wan,Kwon, O-Ki The Korean Neurosurgical Society 2011 Journal of Korean neurosurgical society Vol.49 No.4
Superior petrosal sinus (SPS) dural arteriovenous fistula (DAVF) is one of tentorial DAVFs with significant morbidity, which usually drains into the petrosal vein and its tributaries. Unless there is a connection with venous sinus, surgical obliteration is required. We present two cases of SPS DAVF which were successfully treated with the presigmold retrolabyrinthine approach.
Hwang, Seung-Jae,Kim, Sang-Gon,Kim, Cheol-Won,Lee, Yung-Gyo The Korean Society for Aeronautical and Space Scie 2016 International Journal of Aeronautical and Space Sc Vol.17 No.1
Korea Aerospace Research Institute (KARI) is developing an electric-driven HALE UAV in order to secure system and operational technologies since 2010. Based on the flight tests and design experiences of the previously developed electric-driven UAVs, KARI has designed EAV-3, a solar-powered HALE UAV. EAV-3 weighs 53kg, the structure weight is 22kg, and features a flexible wing of 19.5m in span with the aspect ratio of 17.4. Designing the main wing and empennage of the EAV-3 the amount of the bending due to the flexible wing, 404mm at 1-G flight condition based on T-800 composite material, and side wind effects due to low cruise speed, $V_{cr}=6m/sec$, are carefully considered. Also, unlike the general aircraft there is no center of gravity shift during the flight because of the EAV-3 is the solar-electric driven UAV. Thus, static margin cuts down to 28.4% and center of gravity moves back to 31% of the Mean Aerodynamic Chord (MAC) comparing with the previously designed the EAV-2 and EAV-2H/2H+ to upgrade the flight performance of the EAV-3.
Seung-Jae Hwang,Sang-Gon Kim,Cheol-Won Kim,Yung-Gyo Lee 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.1
Korea Aerospace Research Institute (KARI) is developing an electric-driven HALE UAV in order to secure system and operational technologies since 2010. Based on the flight tests and design experiences of the previously developed electricdriven UAVs, KARI has designed EAV-3, a solar-powered HALE UAV. EAV-3 weighs 53kg, the structure weight is 22kg, and features a flexible wing of 19.5m in span with the aspect ratio of 17.4. Designing the main wing and empennage of the EAV-3 the amount of the bending due to the flexible wing, 404mm at 1-G flight condition based on T-800 composite material, and side wind effects due to low cruise speed, Vcr = 6m/sec, are carefully considered. Also, unlike the general aircraft there is no center of gravity shift during the flight because of the EAV-3 is the solar-electric driven UAV. Thus, static margin cuts down to 28.4% and center of gravity moves back to 31% of the Mean Aerodynamic Chord (MAC) comparing with the previously designed the EAV-2 and EAV-2H/2H+ to upgrade the flight performance of the EAV-3.
황승재(Hwang, Seung-Jae),조주영(Jo, Ju-Young),이융교(Lee, Yung-Gyo) 한국항공우주연구원 2021 항공우주산업기술동향 Vol.19 No.2
성층권 태양광 무인기는 고도 18km~20km 비관제 공역에서 수십일~수년 동안 운영이 가능하다 하여 고고도 장기체공기(HALE UAV, High Altitude Long Endurance Unmanned Aerial Vehicle) 또는, 영상관측 및 통신중계와 같은 인공위성과 유사한 임무 수행이 가능하다 하여 고고도 유사위성(HAPS, High Altitude Psedudo Satellite)으로 불린다. 성층권 태양광 무인기는 미국, 유럽, 일본 등과 같은 선진국에서 민간업체 위주로 개발 경쟁 중인 분야로 주로 LTE/5G 통신중계에 활용하고자 한다. 우리나라는 정부출연연구기관 주도로 개발 중인 분야로 기상관측, 산 불감시, 불법어로 감시 등 실시간 국가재난시스템 구축을 목표로 연구 중이다. 성층권 하부공간을 활용하는 성층권 태양광 무인기는 개발에 성공할 경우 신산업 창출이 가능한 연구 분야이다. Stratosphere Solar-powered Unmanned Aerial Vehicle(UAV) can operate days and years at the Class G Airway between the altitude 59,000~65,600ft. That is why it is named High Altitude Long Endurance(HALE) UAV. Also, it is called High Altitude Pseudo Satellite (HAPS) because HAPS can perform a similar mission with a satellite like surveillance and communication relay. Stratosphere Solar-powered UAV is essentially developed by private companies in the advanced countries like USA, EURO and Japan for the LTE/5G’s platform. However, government owned research institutions leading the field in South Korea are fundamentally developing HALE UAV to build a real-time national disaster warning system. If HALE UAV is successfully developed, a new market will be launched with utilizing the bottom space of the stratosphere.
추교승 ( Gyo-seung Choo ),심재훈 ( Jae-hoon Sim ),문영수 ( Young-soo Mun ),서지원 ( Ji-won Seo ),황인극 ( In-keuk Hwang ) 대한설비관리학회 2017 대한설비관리학회지 Vol.22 No.3
Industry 4.0 and the Industrial Internet of Things (IIoT) has become one of the most talked about industrial business concepts in recent years. One important effect of Industry 4.0 is the fact that due to using control automation many work pieces can be produced cost-effectively not just in large quantities, but also in much smaller lots. Especially, Smart manufacturing realizes the promise and potential of Industry 4.0. The research aims to present intelligent smart factory propulsion models in small and medium-sized businesses for the fourth industrial revolution, not the smart ones.