국내외 표준기상데이터와 표준 건물모델 현황 및 활용

서동현 한국건축친환경설비학회 2015 건축환경설비 Vol.9 No.3

건축과 데이터베이스

서동현 한국건축친환경설비학회 2015 건축환경설비 Vol.9 No.3

감천항 정온도 향상 대책에 관한 비교 연구

서동현,류청로,김헌태,윤한삼 해양환경안전학회 2012 해양환경안전학회 학술발표대회 논문집 Vol.2012 No.04

본 연구의 대상해역 부산 감천항은 지형적 특성과 1980년대 이후 항만 개발로 인해 긴 직사각형 모양의 전형적 장방형 항만이다. 외곽시설로는 1985년 및 1989년에 각각 동·서방파제 축조, 최근 남방파제 등 건설계획이 수립되었다. 이에 최근 동 시설 설치를 위해 설계·시공 일괄입찰 방식(Turn key, T/K)으로 4개 참여회사가 감천항의 정부의 평면배치계획을 바탕으로 제각각의 단면으로 수치·수리실험을 수행하여 정온도 향상 방안을 제시하였

에너지시뮬레이션: 어떤 표준기상데이터를 사용해야 할까?

서동현 한국태양에너지학회 2019 태양에너지 : 한국태양에너지학회지 Vol.17 No.1

Mid-Term Results of Minimally Invasive Direct Coronary Artery Bypass Grafting

서동현,김준성,박계현,임청,정수련,김동중 대한흉부외과학회 2018 Journal of Chest Surgery (J Chest Surg) Vol.51 No.1

Background: Minimally invasive direct coronary artery bypass grafting (MIDCAB) has the advantage of allowing arterial grafting on the left anterior descending artery without a sternotomy incision. We present our single-center clinical experience of 66 consecutive patients. Methods: All patients underwent MIDCAB through a left anterior small thoracotomy between August 2007 and July 2015. Preoperative, intraoperative, postoperative and follow-up data—including major adverse cardiovascular and cerebrovascular events (MACCE), graft patency, and the need for re-intervention—were collected. Results: The mean age of the patients was 69.4±11.1 years and 73% were male. There was no conversion to an on-pump procedure or a sternotomy incision. The 30-day mortality rate was 1.5%. There were no cases of stroke, although 2 patients had to be re-explored for bleeding, and 81.8% were extubated in the operating room or on the day of surgery. The median stay in t he i ntensive c are u nit and in t he h ospital were 1 .5 a nd 9.6 days, respectively. The median follow-up period was 11 months, with a 5-year overall survival rate of 85.3%±0.09% and a 5-year MACCE-free survival rate of 72.8%±0.1%. Of the 66 patients, 32 patients with 36 grafts underwent a postoperative graft patency study with computed tomography angiography or coronary angiography, and 88.9% of the grafts were patent at 9.7±10.8 months postoperatively. Conclusion: MIDCAB is a safe procedure with low postoperative morbidity and mortality and favorable mid-term MACCE-free survival.

Multiple Thymoma with Myasthenia Gravis

서동현,조석기 대한흉부외과학회 2017 Journal of Chest Surgery (J Chest Surg) Vol.50 No.1

The actual incidence of multiple thymoma is unknown and rarely reported because it remains controversial whether the cases represent a disease of multicentric origin or a disease resulting from intrathymic metastasis. In this case, a patient underwent total thymectomy for multiple thymoma with myasthenia gravis via bilateral video-assisted thoracic surgery. A well-encapsulated multinodular cystic mass, measuring 57 mm×50 mm×22 mm in the right lobe of the thymus, and a well-encapsulated mass, measuring 32 mm×15 mm×14 mm in the left lobe, were found. Both tumors were type B2 thymoma. Few cases of multiple thymoma with myasthenia gravis have ever been reported in the literature. We report a case of synchronous multiple thymoma associated with myasthenia gravis.

알칼리 활성화 모르타르의 메타카올린 치환율에 따른 특성

서동현,형원길,Seo, Dong-Hyeon,Hyung, Won-Gil 한국건축시공학회 2016 한국건축시공학회지 Vol.10 No.4

The aim of this study is to look into the metakaolin replacement ratio of blast furnace slag based alkali activated slag mortar and its mechanical characteristics according to changes in stimulant concentration. Metakaolin has high fineness, and therefore the fluidity becomes lower as the replacement ratio becomes higher. So in this study, a sufficient value of mixing water was provided to secure fluidity for the characteristic experiment, and a different W/B was derived for each specimen in order to make the fluidity identical. A characteristic experiment was conducted according to the mol concentration of NaOH, which was used as the mixing water that affects fluidity. Additionally, compressive strength measurement, observation of inner microstructure through SEM, acid resistance experiment, and neutralization resistance was conducted. The results of this study revealed that for a high concentration NaOH solution to have even fluidity, a high W/B is necessary, and the functions were enhanced, not degraded. 본 연구의 목적은 고로슬래그 베이스 AAS 모르타르의 메타카올린 치환율과 자극제 농도의 변화에 따른 역학적 특성과 내구성에 대하여 알아보는 것이다. 메타카올린은 분말도가 높아서 치환율이 높아질수록 유동성이 많이 저하되기 때문에 본 연구에서는 충분한 NaOH 수용액를 가하여 시공성을 확보한 상태에 실험을 진행하였다. 따라서 모든 시험체의 시공성을 동일하게 하는 각기 다른 Ws/B를 도출하였고, 이에 따라 시공성에 영향을 미치는 NaOH 수용액의 몰 농도별 특성에 대한 실험을 진행하였다. 또한 압축강도 측정실험, SEM을 통한 내부 미세구조 관찰, 내산성 실험 실험을 진행하였다. 본 연구 결과 메타카올린 치환율이 높은 배합은 Ww가 많이 필요로 하였지만, 그에 따른 성능 저하는 나타나지 않으며 오히려 우수한 역학적 내구적 성능을 보여주었다. 또한 [6M]보다 [8M]농도의 NaOH 자극제를 사용했을 때 메타카올린 치환 효과가 극대화 되었다.

사람 포즈 추정을 이용한 인터렉티브 메타버스 시스템

서동현,이정수,김준현,최현지,박경빈,이영문 제어로봇시스템학회 2022 제어로봇시스템학회 국내학술대회 논문집 Vol.2022 No.6

제조업에서의 용접⋅용단 작업 중 화재⋅폭발⋅질식 사망사고 특성

서동현,한우섭,이근원 한국안전학회 2019 한국안전학회지 Vol.34 No.3

Many accidents have been occurring during welding and flame cutting work related to maintenance and repair as the domestic manufacturing facilities gradually become decrepit. However, it is not easy to find the accurate statistics and analysis data on accidents occurring during welding or flame cutting operations related to maintenance and repair of machinery and equipment. Therefore, in this study, the fatal accident cases of fire/explosion and asphyxiation that occurred during the welding and flame cutting work in the manufacturing industry were collected and their characteristics were analyzed. Then, we tried to find the connection of the accidents according to the machinery/ equipment and the work content, and to provide the materials and measures that can be used to prevent the similar accidents. We collected 329 cases of the fatal accidents related to fire/explosion and leakage/contact of chemical substances in the domestic manufacturing industry during the last 10 years (2008 ∼ 2017). Among them, 72 accidents occurred during welding or flame cutting were extracted and the related reports were investigated whether they occurred during usual work or unusual work. Also, the machinery/equipment and the work content related to the accidents were classified and analyzed based on the criteria. The analysis results showed that 31 cases of the fire/explosion accidents occurred during usual work and 32 cases during unusual work, and it was found that 9 cases of asphyxiation death occurred during usual work. Then, from the analysis results, the connections of the machinery/equipment and the work contents related to the accidents were schematized into a accident tree.

무지 외반증 치료로 사용된 제1 중족골 근위 반월형 절골술 후 발생한 제1 중족골 족배측 각형성 정도

서동현,박용욱,김도영,이상수,서영진,박현철,강승완,Suh, Dong-Hyun,Park, Yong-Wook,Kim, Do-Young,Lee, Sang-Soo,Seo, Young-Jin,Park, Hyun-Chul,Kang, Seung-Wan 대한족부족관절학회 2004 대한족부족관절학회지 Vol.8 No.2

Purpose: We try to retrospectively evaluated the amount of dorsal angulation angle of the first metatarsal commonly occurring as the complication of proximal dome osteotomy for hallux valgus. Materials and Methods: Between January 2004 and March 2004, 34 patients who underwent proximal dome osteotomy for moderate to severe hallux valgus. Two of 34 patients were male, and thirty-two were female. The average age was 57.6 years. We measured and compared hallux valgus angle, 1st-2nd intermetatarsal angle, dorsal angulation angle of 1st metatarsal on preoperative, postoperative, postoperative 3 weeks', postoperative 3 months' X-ray. Results: Osteotomy sites were completely united on plane X-ray in all cases. The hallux valgus angle averaged $41.2^{\circ}$ ($30{\sim}60^{\circ}$) at preoperative, $4.3^{\circ}$ ($-10{\sim}20^{\circ}$) at postoperative, $5.5^{\circ}$ ($-1{\sim}20^{\circ}$) at 3 weeks after operation, $7.8^{\circ}$ ($-2{\sim}20^{\circ}$) at 3 months after operation. The 1st-2nd intermetatarsal angle averaged $17.1^{\circ}$ ($12{\sim}24^{\circ}$) at preoperative, $6.3^{\circ}$ ($0{\sim}13^{\circ}$) at postoperative, $7.2^{\circ}$ ($0{\sim}15^{\circ}$) at 3 weeks after operation, $8.7^{\circ}$ ($0{\sim}18^{\circ}$) at 3 months after operation. The dorsal angulation angle averaged $0.4^{\circ}$ ($0{\sim}3^{\circ}$) at postoperative, $1.6^{\circ}$ ($0{\sim}7^{\circ}$) at 3 weeks after operation, $2.1^{\circ}$ ($0{\sim}8^{\circ}$) at 3 months after operation. There were no statistically correlation between increase of dorsal angulation angle of the distal segment of the first metatarsal and increase of hallux valgus angle or 1st-2nd intermetatarsal angle. Conclusion: Our results shows that the dorsal angulation of distal fragment occurring after the proximal dome osteotomy in the treatment of hallux valgus may be minimized with meticulous surgery and patient's education.