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적분관측기를 이용한 선형시스템의 미지입력추정에 관한 연구
이명규(Myung-Kyu Lee) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.2
본 논문에서는 측정 잡음이 존재하는 선형시스템의 미지 입력 추정에 관하여 기술하였다. 적분관측기를 기초로 한 본 연구의 방법은 미지 입력을 정확히 추정해낼 수 있을 뿐만 아니라 추정 성능도 높일 수 있다. 시뮬레이션 결과와 기존 방법의 비교를 통해 본 연구 방법의 유용성을 입증할 수 있었다. This paper deals with the unknown input estimation for linear dynamic systems with sensor noise. The presented method based on the integral observer permits to achieve good convergence and exact estimation of unknown inputs. The validity of proposed method is established by comparison with simulation results and the existing methods.
이명규(Myung-Kyu Lee),박설현(Seul-Hyun Park) 한국화재소방학회 2021 한국화재소방학회논문지 Vol.35 No.6
화재 발생 시 열방출율은 가연물의 열분해율과 유효 연소열의 상관관계에 의해서 결정된다. 가연물의 열분해율을정확하게 결정하기 위해서는 반응열(heat of reaction)에 대한 이해가 중요하다. 하지만 목재와 같이 연소과정에서 탄화가 발생되는 경우 다단계 열분해 반응을 거치기 때문에 반응열을 정확하기 측정하기 어렵다. 본 연구에서는 가연물의 반응열 차이와 탄화도의 비율이 연소 시 발생하는 열방출율에 어떠한 영향을 미치는지 알아보기 위해 ISO5660-1 콘칼로리미터 실험을 수행하여 열방출율 측정하였고 fire dynamics simulator (FDS) 전산 해석을 통해 계산된값과 비교·분석하였다. 가연물로는 수분을 제거한 소나무과 상록수인 douglas-fir를 사용하였다. 콘칼로리미터 실험과FDS전산해석 결과를 바탕으로 반응열과 탄화도의 증가가 열방출율 감소와 직접적인 상관관계가 있음을 확인하였다. The heat release rate (HRR) of fires can be determined from the relationship between the thermal pyrolysis rate ofcombustibles and the effective heat of combustion. To accurately determine the thermal pyrolysis rate of combustibles, itis important to understand the heat of reaction of combustibles. However, this parameter is difficult to measure forcombustibles, such as wood, that produce charring during combustion because they undergo a multi-step pyrolysis reaction. In this study, the ISO 5660-1 standard method was used to perform cone calorimetry experiments to understand how theHRR is affected by the heat of reaction heat and charring properties of combustibles. To this end, the HRR calculated usingFDS computational analysis was compared to the measured value from the ISO 5660-1 cone calorimetry experiments. Adehydrated Douglas-fir, an evergreen tree of the pine family, was used as a combustible material. The cone calorimetryexperiment and FDS computational analysis results confirmed that increases in the heat of reaction and charring propertieswere directly correlated with the decrease in the HRR.
이명규(Myung Kyu Lee) 한국언어문화학회 2000 한국언어문화 Vol.18 No.-
This is a study of the histories and origins behind the names of the villages, plains, and mountains in Wolam-dong and Chopyong-dong. The research method employed for this study is two-pronged. One is to review some of old literature including <Yojidoseo>(1759), <Hoguchongsu>(1789), and <Choseonjijijaryo>(1919). The other is to study tomb stones and other stone monuments on the one hand and to interview natives of the places being studied about what know or heard from their ancestors concerning the names of their villages and the places nearby. The results, obtained by comparing the materials thus collected, reveal how some of the places were named what they are called now. The place name Wolam, for instance, is found to be derived from the name Wolgok, which in turn has its first syllable Wol coming from Wolbong-san, a mountain in the region, and its second syllable Gok coming from goljjagi meaning `valley`, which normally meant `village`. Studies of old place names, which reveal our ancestors` attitudes to naming and their belief about it, are meaningful in that they give help to examining our traditional culture.