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The Novel Hooked Kirschner Wire Technique for Ulna Coronoid Process Fractures
Seongwoo Jo,Dong-Ju Shin 대한정형외과학회 2023 Clinics in Orthopedic Surgery Vol.15 No.1
Background: The aim of this study was to introduce a novel technique to improve the ease of fixing of even small fragments of the coronoid process and report the clinical outcomes of this method. Methods: Forty-nine patients with ulnar coronoid process fractures fixed using the hooked Kirschner wire (K-wire) technique at our hospital from 2007 to 2019 were reviewed. Radiological features and fracture union were assessed using simple radiographs. Functional outcomes of the treated elbows were evaluated at the final follow-up visit using the Mayo Elbow Performance Score (MEPS). Results: All patients were examined at a mean follow-up of 17.7 months (range, 6–62 months). We observed bony union in patients at a mean of 10.9 weeks (range, 6–22 weeks). The mean flexion and extension ranges of the elbow were 132.0° (range, 106° –151°) and 4.5° (range, –20° to 30°), respectively. The mean pronation and supination ranges of the forearm were 81.1° (range, 60°–90°) and 88.3° (range, 60°–120°), respectively. The mean arc of the elbow was 127.4° (range, 78°–160°). All patients were evaluated using the MEPS at the final follow-up visit, with a mean score of 96.9 points (range, 80–100 points). One case of coronoid nonunion was observed and re-fixation was performed. One case of infection was observed and also treated with additional surgery. Three patients complained of ulnar nerve symptoms and 1 patient underwent surgical release for tardy ulnar nerve palsy. Conclusions: Despite its limitations, the hooked K-wire technique was a useful method for even smaller coronoid process fractures. K-wires were also a useful temporary intraoperative fixation method and could provide permanent fixation.
Jo, Min Cheol,Park, Jaeyeong,Sohn, Seok Su,Kim, Seongwoo,Oh, Jinkeun,Lee, Sunghak Elsevier Sequoia 2017 Materials science & engineering Structural materia Vol.707 No.-
<P><B>Abstract</B></P> <P>Hot press forming (HPF) steel sheets are austenitized, press-formed, and rapidly cooled to obtain a martensitic microstructure with an ultra-high strength. When they are insufficiently austenitized, their microstructures might contain a small amount of untransformed ferrite, which can deteriorate impact toughness as well as strength, but its causes and relevant fracture mechanisms have not been clearly verified yet. In this study, thus, 1.8-GPa-grade HPF sheets were austenitized at various temperature and time, and their tensile and Charpy impact test results were analyzed in relation with untransformed ferrite and its effect on fracture mechanisms. In the HPF sheets containing the untransformed ferrite, voids were formed mostly at ferrite/martensite interfaces, and were grown and propagated linearly to form a cleavage crack, whereas deformation bands were well developed without voids or cracks in the non-ferrite-containing sheets. The highly localized strains accommodated in the soft ferrite made ferrite/martensite interfaces or ferrite itself work as fracture initiation sites, which led to the brittle fracture and consequently to the deterioration of impact energy. This result can provide an important idea for optimization of austenitization conditions demanded for ultra-high strength and excellent impact toughness in HPF applications.</P>
남한 지역 고해상도 기후지도 작성을 위한 공간화 기법 연구
조아영 ( Ayeong Jo ),류지은 ( Jieun Ryu ),정혜인 ( Hyein Chung ),최유영 ( Yuyoung Choi ),전성우 ( Seongwoo Jeon ) 한국환경영향평가학회 2018 환경영향평가 Vol.27 No.5
본 연구의 목적은 다양한 지리통계학적 공간화 기법을 적용한 격자기후자료와 기상청에서 제공하는 국지예보모델(Local Data Assimilation and Prediction System, LDAPS) 격자기후자료를 비교 분석하여 남한 지역의 고해상도 격자기후지도 작성 방안을 모색하는 것이다. 2017년의 595개 기후관측자료 중, 80%의 지점자료를 이용하여 순간 온도와 1시간 누적강수량에 대한 격자기후자료를 생성하였고 나머지 117개의 지점자료를 검증에 이용하였다. ArcGIS10.3.1과 Python3.6.4을 이용하여 관측자료 및 DEM을 IDW, 공동크리깅, 크리깅에 적용한 후, 공간보간 결과를 3개 군집으로 나누어 검증하였으며 LDAPS 격자기후자료를 바탕으로 유역 별 패턴 비교를 수행하였다. 결과적으로 순간 온도의 공간화에는 고도를 부변수로 추가한 공동크리깅이, 1시간 누적강수량 공간화에는 IDW가 가장 적합하였다. The purpose of this study is to build a new dataset of spatially interpolated climate data of South Korea by performing various geo-statistical interpolation techniques for comparison with the LDAPS grid data of KMA. Among 595 observation data in 2017, 80 % of the total points and remaining 117 points were used for spatial mapping and quantification, respectively. IDW, cokriging, and kriging were performed via the ArcGIS10.3.1 software and Python3.6.4, and each result was then divided into three clusters and four watersheds for statistical verification. As a result, cokriging produced the most suitable grid climate data for instantaneous temperature. For 1-hr accumulated precipitation, IDW was most suitable for expressing local rainfall effects.
시스템 식별을 통한 TMD의 태풍거동 및 풍진동 저감성능 분석
최선영(Choi Sunyoung),조성우(Jo Seongwoo),김홍진(Kim Hongjin),황재승(Hwang Jea-Seung) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
The typhoon behavior and performance of a tuned mass damper (TMD) are presented based on the system identification and modal wind load estimation. The TMD is installed on a 39-story, 184.6m steel building located in Songdo, Incheon, and the monitoring system including an anemometer, accelerometers, and internet-based data logging system. The building had experienced a Typhoon ‘Gonpas’ on Sep. 2, 2010, and the peak wind speed measured by an anemometer installed on the roof floor was 49.7 ㎧. The coupled building-TMD modes and modal wind load are identified and the vibration reduction performance of the TMD is evaluated.
Cho, Sangeun,Lee, Seongwoo,Hou, Bo,Kim, Jongmin,Jo, Yongcheol,Woo, Hyeonseok,Pawar, Sambhaji M.,Inamdar, Akbar I.,Park, Youngsin,Cha, SeungNam,Kim, Hyungsang,Im, Hyunsik Pergamon Press 2018 Electrochimica Acta Vol. No.
<P><B>Abstract</B></P> <P>Mesoporous Ni-Co oxide (NCO) nanosheet electrodes are fabricated on Ni foam via an electrodeposition technique. Their bifunctional activities for electrochemical energy storage and electro-catalysis for water splitting in strong alkaline media are optimized by varying the ratio of concentrations of the Ni and Co precursors. The ratio-based changes vary the pore size of the NCO nanosheets between 92.5 and 200 nm, and structural analyses reveal that the electrode films have a spinel NiCo<SUB>2</SUB>O<SUB>4</SUB> structure. The obtained specific capacitance varies dramatically between 613 and 2704 Fg<SUP>−1</SUP> at 2 mA cm<SUP>−2</SUP>, with good capacity retention (80–90%) after 2000 cycles. The NCO nanosheet electrodes also exhibit a good oxygen evolution reaction at the surface. The lowest overpotential (315 mV at 10 mA cm<SUP>−2</SUP>) is obtained with a Tafel slope of 59 mV dec<SUP>−1</SUP>. The observed bifunctional activities of the new NCO nanosheet electrode are superior to those of nanostructured NCO electrodes prepared via hydrothermal and SILAR methods. The analyses regarding the electrochemically active surface area and electrochemical impedance spectroscopy, together with the observed electrochemical performance, reveal that the most-optimized Ni and Co composition produces the synergetic effects of an electrochemically active surface area and great stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mesoporous Ni-Co oxide (NCO) nanosheet electrodes are fabricated on Ni foam via an electrodeposition technique. </LI> <LI> Excellent specific capacitance and electrochemical stability are obtained. </LI> <LI> The overpotential of 315 mV at 10 mA cm<SUP>−2</SUP> is obtained with a Tafel slope of 59 mV dec<SUP>−1</SUP>. </LI> </UL> </P>
스마트시티에서 활용 가능한 LoRa기반 화재 대피 경로 안내 시스템
염진호(Jinho Yeom),조성우(Seongwoo Jo),양서린(Seorin Yang),김경백(Kyungbaek Kim) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.6
최근 국내에서 스마트시티 조성이 활성화됨에 따라 이에 적합한 LoRa 통신을 중심으로 연구를 진행하였다. 본 논문에서는 현재 사용 중인 수동형 대피체계의 한계를 보완하고자 화재 상황에 따른 방향 지시 서비스를 구현하였다. 저전력 장거리 통신이 가능한 LoRa 모듈을 이용해 통신망을 구축하였다. 화재 발생 시 CSI 카메라 모듈을 이용한 YOLO 객체 탐지와 온습도 센서를 통해 건물 내부의 혼잡도와 상황을 파악한다. 이러한 데이터를 바탕으로 총 대피시간을 단축시킬 수 있는 대피알고리즘에 적용해 최적의 대피 경로를 안내하는 화재 대피 경로 안내 시스템 개발을 제안한다.
The Prognostic Implication of Metabolic Syndrome in Patients with Heart Failure
윤현주,안영근,김계훈,박종춘,최동주,Seongwoo Han,전은석,조명찬,Jae-Joong Kim,Byung-Su Yoo,신미승,성인환,Seok-Min Kang,Yung-Jo Kim,Hyung Seop Kim,채성철,오병희,Myung-Mook Lee,유규형 대한심장학회 2013 Korean Circulation Journal Vol.43 No.2
Background and Objectives: Metabolic syndrome (MetS) increases the risk of heart failure (HF). The purpose of this study was to identi-fy the prevalence of MetS in patients with HF and determine the syndrome’s association with HF in clinical and laboratory parameters. Subjects and Methods: A total of 3200 HF patients (67.6±14.5 years) enrolled in a nationwide prospective Korea HF Registry between Jan. 2005 and Oct. 2009. Patients were divided into two groups according to the presence or absence of MetS at admission: group I (pres-ence, n=1141) and group II (absence, n=2059). Results: The prevalence of MetS was 35.7% across all subjects and was higher in females (56.0%). The levels of white blood cells, platelets,creatinine, glucose, and cholesterol were significantly higher in group I than in group II. Left ventricular dimension and volume was smaller and ejection fraction was higher in group I than in group II. An ischemic cause of HF was more frequent in group I. The rates of valvular and idiopathic cause were lower in group I than in group II. The rate of mortality was lower in group I than in group II (4.9% vs. 8.3%, p<0.001). Conclusion: Despite the increased cardiovascular risks in MetS, MetS was found to be associated with decreased mortality in HF.