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김형래,양훈기,양성현,강봉순,Kim, Hyeong-Rae,Yang, Hoon-Gee,Yang, Seong-Hyeon,Kang, Bong-Soon 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.2
본 논문에서는 시간 영역 기반의 비동기 IR-UWB 거리추정 시스템을 제안한다. 제안하는 시스템은 시간 영역에 서 고속으로 샘플링된 IR-UWB 신호에 대해서 FIR 필터를 이용해 코릴레이션 연산을 하여 피크를 검출한다. 코릴레이션 과정에 의해 신호성분이 단계적으로 커지지만 잡음환경에서의 성공적인 동작을 위해서 본 연구에서는 윈도우를 이용해서 잡음레벨을 추정한다. 주파수 영역 기반의 방식과의 비교 관점에서 시스템 구조 및 동작과정을 설명하고 시뮬레이션에 의해 제시된 시스템이 주파수 영역 기반의 시스템과 유사하게 우수한 성능을 나타냄을 보인다. This paper presents a time-domain based asynchronous IR-UWB ranging system. This system accomplishes the ranging by detecting peaks from the outputs of a correlator implemented by a FIR filter. To discriminate the peaks due to a signal component, we use windowing for the correlated data within which the data are sorted in amplitude-ascending order and the noise level is calculated. Comparing with the recently presented frequency-domain based ranging system, we show the system structure and explain how it operates for ranging. Moreover, through the simulations, the proposed system is compared with the frequency-domain based system in terms of performance.
김형래 ( Hyeong Rae Kim ),임은화 ( Eun Wha Lim ),이 영 ( Young Lee ),서영준 ( Young Joon Seo ),이증훈 ( Jeung Hoon Lee ),임 명 ( Myung Im ) 대한피부과학회 2014 大韓皮膚科學會誌 Vol.52 No.1
Aseptic subcutaneous abscesses are characterized by deep, round lesions histologically consisting of neutrophils, without evidence of microorganisms on culture. Although these are sometimes reported in healthy individuals, most are reported in patients with inflammatory bowel disease, including Crohn's disease and ulcerative colitis. A 79-year-old man without underlying disease presented with multiple skin-colored nodules and masses on his face and extremities 4 years ago. All of the microbiology studies for bacteria and fungi were negative and he did not respond to antibiotics. However, the lesions improved markedly after systemic prednisolone treatment. We diagnosed his lesions as aseptic subcutaneous abscesses. Further studies to evaluate inflammatory bowel disease were negative. Here, we report a case of multiple aseptic subcutaneous abscesses without an underlying disease. (Korean J Dermatol 2014;52(1):44∼47)