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이철우 ( Rhee Chulwoo ),탁상우 ( Tak Sangwoo ),강인순 ( Kang Insoon ),엄유식 ( Eom Yu Sik ),이수진 ( Lee Su-jin ),윤창교 ( Yoon Changgyo ) 국군의무사령부 2015 대한군진의학학술지 Vol.46 No.1
Recent emerging infectious disease outbreaks at an unprecedented frequency have demonstrated their potential threats to Armed Forces in Republic of Korea. Beyond the pandemics and other emerging infectious disease, bioterrorism also remains as an enduring threat to the safety of military personnels. In order to better our force protection and early response to all hazards, Armed Forces Medical Command under Ministry of National Defense needs to expand their role in disease surveillance. Domestic approaches to enhance disease surveillance is mainly led by Korean Center for Disease Control and Prevention (KCDC). KCDC operates Notifiable Disease Reporting System as well as Emergency Room Syndromic Surveillance System and Infectious Disease Specialist Network. Armed Forces Medical Command also operates similar disease surveillance system as well. However periodic evaluation and methods for dissemination invites further improvements within military surveillance environment. By taking advantages of the current military information technologies and public health infrastructure as well as leveraging other civilian efforts, Armed Forces Medical Command can optimize their disease surveillance capabilities. Through these effort, public health preparedness and response of military will be greatly improved.
육상 탄성파자료에 대한 나머지 정적보정의 효과: 주행시간 분해기법과 겹쌓기제곱 최대화기법
사진현 ( Jinhyeon Sa ),우주환 ( Juhwan Woo ),이철우 ( Chulwoo Rhee ),김지수 ( Jisoo Kim ) 한국지구물리·물리탐사학회 2016 지구물리와 물리탐사 Vol.19 No.1
나머지 정적보정 기법중에서 가장 많이 쓰이는 주행시간 분해기법과 겹쌓기제곱 최대화기법의 적용성을 육상 탄성파자료에서 비교 검토하였다. 모든 발파점과 수신점에 대한 임의의 나머지 정적보정값(시간차이)과 무작위 잡음이 포함된 모델자료에서 겹쌓기제곱 최대화기법은 주행시간 분해기법에 비해 흐트러진 반사 이벤트를 정확히 정렬시키고 보정과정에서 출력된 발파점과 수신점의 정적보정 그래프가 입력된 값과 거의 같은 진폭으로 역전된다는 점에서 신호대잡음이 작은 자료의 반사면 향상에 보다 효과적이었다. 나머지 정적보정에 적합한 입력인자(최대허용 시간차이, 상관창, 반복횟수)들은 공통중간점 자료외에 공통발파점 겹쌓기자료와 공통수신점 겹쌓기자료에 대한 연속 테스트를 거쳐 효과적으로 진단할 수 있었다. 나머지 정적보정에 앞서 송수신점의 높이보정 및 풍화대 깊이보정을 실시하여 장파장 시간차이를 제거하고 진동수-파수 필터링, 예측곱풀기, 시간변화 빛띠흰색화로 잡음을 줄여 교차상관의 오차를 최소화시킨다. 또한 나머지 정적보정후 수직시간차 역보정을 거쳐 속도를 재분석하여 겹쌓기한 결과 저류층을 포함한 반사면들의 향상된 연속성 및 분해능을 확인할 수 있었다. Two representative residual static methods of traveltime decomposition and stack-power maximization are discussed in terms of application to land seismic data. For the model data with synthetic shot/receiver statics (time shift) applied and random noises added, continuities of reflection event are much improved by stack-power maximization method, resulting the derived time-shifts approximately equal to the synthetic statics. Optimal parameters (maximum allowable shift, correlation window, iteration number) for residual statics are effectively chosen with diagnostic displays of CSP (common shot point) stack and CRP (common receiver point) stack as well as CMP gather. In addition to removal of long-wavelength time shift by refraction statics, prior to residual statics, processing steps of f-k filter, predictive deconvolution and time variant spectral whitening are employed to attenuate noises and thereby to minimize the error during the correlation process. The reflectors including horizontal layer of reservoir are more clearly shown in the variable-density section through repicking the velocities after residual statics and inverse NMO correction.