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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 ),김홍삼 ( Kim Hong-sam ),윤기덕 ( Yoon Gi-deok ),경기원 ( Gyeong Gi-won ),김정남 ( Kim Jeong-nam ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표회 논문집 Vol.24 No.1
고속도로 교량의 콘크리트 단면 열화에 대한 조치로 단면복구공사를 실시하고 있다. 한해 400억 원의 예산이 투입되고 있는 콘크리트 구조물의 대표적인 보수공법이다. 그러나 단면복구공사의 증가와 함께 최근 보수부위에 대한 재손상사례가 늘어나고 있다. 재손상의 방지, 재보수주기 연장을 위해선 단면복구공사의 설계개념 재정립, 성능기반의 재료성능기준 마련, 시공지침 개선, 보수공사체계 마련 등이 필요하다. 본 연구에서는 단면복구공사 후 보수부위의 손상사례 및 원인에 대한 분석과 함께 보수주기를 연장할 수 방안을 위해 우리 공사에서 추진해야 할 세부과제들에 대해 검토하기로 한다.