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이일근,Lee, Il-Keun 대한수면의학회 2001 수면·정신생리 Vol.8 No.1
Independent Component Analysis (ICA) is a blind source separation method using unsupervised learning and mutual information theory created in the late eighties and developed in the nineties. It has already succeeded in separating eye movement artifacts from human scalp EEG recording. Several characteristic sleep waves such as sleep spindle, K-complex, and positive occipital sharp transient of sleep (POSTS) can be recorded during sleep EEG recording. They are used as stage determining factors of sleep staging and might be reflections of unknown neural sources during sleep. We applied the ICA method to sleep EEG for sleep waves separation. Eighteen channel scalp longitudinal bipolar montage was used for the EEG recording. With the sampling rate of 256Hz, digital EEG data were converted into 18 by n matrix which was used as a original data matrix X. Independent source matrix U (18 by n) was obtained by independent component analysis method ($U=W{\timex}X$, where W is an 18 by 18 matrix obtained by ICA procedures). ICA was applied to the original EEG containing sleep spindle, K-complex, and POSTS. Among the 18 independent components, those containing characteristic shape of sleep waves could be identified. Each independent component was reconstructed into original montage by the product of inverse matrix of W (inv(W)) and U. The reconstructed EEG might be a separation of sleep waves without other components of original EEG matrix X. This result (might) demonstrates that characteristic sleep waves may be separated from original EEG of unknown mixed neural origins by the Independent Component Analysis (ICA) method.
이일근 ( Lee Il-keun ),윤성환 ( Yoon Sung-hwan ) 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.26 No.2
고속도로 콘크리트 중앙분리대에 알칼리골재반응(Alkali-Silica Reaction, ASR)으로 망상균열의 형태로 손상이 나타나고 있다. 이러한 균열은 중앙분리대의 구조성능을 떨어뜨려 요구성능을 발휘하지 못하게 된다. 본 연구에서는 ASR로 열화된 콘크리트 중앙분리대의 유지관리사례를 소개하기로 한다. 우선 ASR로 인한 콘크리트의 상태를 조사하고 상태에 따라 보수방안을 제시하기 위해 ASR 열화진전 상태를 구분하였다. ASR 상태에 따라 구조성능 저하 모델을 정의하고 충돌해석으로 구조성능을 평가하였다. 마지막으로 구조성능평가 결과에 따라 유지관리방안을 제시하였다.