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Streptococcus constellatus에 의한 경막 외 농양이 동반된 화농성 척추염 1예
안홍대,박재찬,서종구,김진용,김수연,박윤수,서일혜,조용균 대한감염학회 2008 감염과 화학요법 Vol.40 No.5
We report a case of vertebral osteomyelitis with epidural abscess caused by Streptococcus constellatus. The patient was present with fever, back pain, and dyspnea for 1 week. The patient was previously healthy and did not have any predisposing factor. After evaluation, the patient was diagnosed as Streptococcus constellatus vertebral osteomyelitis. He was successfully treated with surgical debridement and antibiotic therapy. To the best of our knowledge, this is the first case of S. constellatus vertebral osteomveltis with epidural abscess to be reported in Korea.
Streptococcus constellatus에 의한 경막 외 농양이 동반된 화농성 척추염 1예
안홍대,박재찬,서종구,김진용,김수연,박윤수,서일혜,조용균 대한감염학회 2008 Infection and Chemotherapy Vol.40 No.5
We report a case of vertebral osteomyelitis with epidural abscess caused by Streptococcus constellatus. The patient was present with fever, back pain, and dyspnea for 1 week. The patient was previously healthy and did not have any predisposing factor. After evaluation, the patient was diagnosed as Streptococcus constellatus vertebral osteomyelitis. He was successfully treated with surgical debridement and antibiotic therapy. To the best of our knowledge, this is the first case of S. constellatus vertebral osteomyeltis with epidural abscess to be reported in Korea.
OFDMA 시스템에서 지연 QoS를 지원하는 2-D 사용자 다중화 기법에 대한 높은 SNR영역에서의 성능 분석
안성우(Seongwoo Ahn),홍대식(Daesik Hong) 大韓電子工學會 2011 電子工學會論文誌-TC (Telecommunications) Vol.48 No.4
본 논문은 OFDMA 시스템에서 지연 QoS와 시스템 용량 간의 트레이드오프에 대해 2차원 자원할당 관점에서 살펴보고, 주파수 다이버시티와 시간축 사용자 다중화가 지연 QoS 성능에 미치는 영향을 분석하였다. 이를 바탕으로 지연 QoS가 시스템의 주파수 효율 (spectral efficiency)에 영향을 미치는 영향을 살펴보았다. 특히, 높은 SNR 영역에서 시간축 다중화도 (degree of multiplexing)에 따른 주파수 효율의 변화를 분석하여 효율적인 다중화 기법에 대한 방향을 제시하였다. 마지막으로 모의실험을 통하여 분석 결과를 검증하였으며, 최적의 다중화도를 이용할 때 상당한 성능이득을 얻을 수 있음을 확인하였다. In this paper, we study the throughput-delay tradeoff of OFDMA systems in context of 2-dimensional resource allocation, and analyze the effect of frequency diversity and user-multiplexing in time domain that has on delay QoS performance. Based on the analysis results, we investigate the impacts of delay QoS on spectral efficiency. In high SNR regime, the optimal DoM (degree of multiplexing) maximizing the spectral efficiency is identified. The results of the high SNR analysis can give us an intuition on an efficient resource allocation policy. Finally, through the simulation results, we verify that our approach with its optimal DoM yields substantial capacity gain.
저전력 무선통신 시스템에서 사용자 다중화가 지연 QoS 성능에 미치는 영향 분석
안성우(Seongwoo Ahn),홍대식(Daesik Hong) 大韓電子工學會 2011 電子工學會論文誌-TC (Telecommunications) Vol.48 No.4
본 논문은 지연 QoS (delay Quality of Service)에 대한 제약이 주어졌을 때의 시스템 용량을 정량화 할 수 있는 분석모델을 제시하고, 이를 바탕으로 다중사용자 저전력 무선통신 시스템에서 사용자 다중화가 지연 QoS에 미치는 영향을 분석하였다. 이를 위해, 한 프레임에서 스케줄 되는 사용자 수를 다중화도 (degree of multiplexing)이라 정의하고, 다중화도가 지연 서비스 품질과 시스템 용량 간의 관계에 미치는 영향을 분석하였다. 또한, 저전력 통신환경에서 에너지 효율성을 고려할 때 최적의 다중화도가 어떻게 변화하는지를 확인하였다. 마지막으로 모의실험을 통하여, 최적의 다중화도를 이용할 때 상당한 성능이득을 얻을 수 있음을 확인하였다. In this paper, we present the analytic model to quantify the system capacity with delay Quality of Service (QoS) constraints, and analyze the effect of user-multiplexing on the delay QoS performance in multiuser low-power wireless communication systems. For this purpose, we define the degree of multiplexing as the number of scheduled users to be served in a frame, and investigate the effect of degree of multiplexing (DoM) on the trade-off of throughput and delay QoS constraints. Through this analysis, we characterize the optimal DoM maximizing the energy efficiency in low-power communication environments. Finally, through the simulation results, we verify that our approach with its optimal DoM yields substantial capacity gain.
윤능기,윤형렬,서석권,이승훈,이무식,안은주,홍대용,이종영 啓明大學校 醫科大學 1992 계명의대학술지 Vol.11 No.1
To investigate low back pain in rural women, 452 housewives living in the rural areas of Kyungnam province were interviewed during August 1990, and 444 subjects completely done were used for analysis. Attack rate of low back pain during the previous six months was 50.2%. In logistic regression analysis,a history of back injury(odds ratio - 3.439) and presence of other mus-culoskeletal disorders(odds ratio=2.047)were sighificantly independent of attacks of low back pain(p<<0.001), but age and parity were not. Excluding those 70 years old and over or no parity , the frequency of parity showed a significantly independent effect as odds ratio of 1.199(p<0.01)
Spontaneous Healing of Gastric Perforation after Endoscopic Ligation for Gastric Varices
김정호,안홍대,권광안,김윤재,정준원,박동균,김주현 대한의학회 2013 Journal of Korean medical science Vol.28 No.4
Endoscopic variceal ligation (EVL) can be performed as an optional therapy for gastric variceal bleeding if endoscopic sclerotherapy (ES) is not readily available or if practitioners lack experience. EVL using an endoscopic pneumo-activated ligating device was performed on a 53-year-old male patient with liver cirrhosis who presented with hematemesis. Follow-up esophagogastroduodenoscopy (EGD) performed two days after the EVL showed gastric perforation at the EVL-procedure site on the gastric fundus. However, the patient refused emergency surgery, and therefore received only supportive management, including intravenous antibiotics. EGD 10 days later showed healing of the perforation site. This is the first report of a case of gastric variceal bleeding with development of a gastric perforation soon after EVL, which showed complete recovery with conservative therapy and without surgical intervention.
서종구,박재찬,안홍대,이서영,김진용,박윤수,조용균 대한감염학회 2008 Infection and Chemotherapy Vol.40 No.6
Klebsiella pneumoniae is a pathogen that causes a wide range of infections in human, and has a tendency to metastasize to multiple organs. We report two rare cases of K. pneumoniae infection that have spread to multiple organs without being accompanied by liver abscess. A 59-year-old man (case 1) was admitted due to left knee pain. Microbiologic and radiologic studies revealed bacteremia, septic arthritis, pneumonia, prostatitis, and endophthalmitis caused by K. pneumoniae. A 48-year-old man (case 2) was admitted due to febrile sensation. Microbiologic and radiologic studies revealed bacteremia, pneumonia, urinary tract infection, endophthalmitis, and cerebritis caused by K. pneumoniae. With appropriate use of effective antibiotics and therapeutic measures, the patients recovered but with some sequelae.