http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
동작 상상 EEG 분류를 위한 이중 filter-기반의 채널 선택
이다빛(David Lee),이희재(Hee Jae Lee),박상훈(Snag-Hoon Park),이상국(Sang-Goog Lee) Korean Institute of Information Scientists and Eng 2017 정보과학회논문지 Vol.44 No.9
Brain-computer interface (BCI) is a technology that controls computer and transmits intention by measuring and analyzing electroencephalogram (EEG) signals generated in multi-channel during mental work. At this time, optimal EEG channel selection is necessary not only for convenience and speed of BCI but also for improvement in accuracy. The optimal channel is obtained by removing duplicate(redundant) channels or noisy channels. This paper propose a dual filter-based channel selection method to select the optimal EEG channel. The proposed method first removes duplicate channels using Spearmans rank correlation to eliminate redundancy between channels. Then, using F score, the relevance between channels and class labels is obtained, and only the top m channels are then selected. The proposed method can provide good classification accuracy by using features obtained from channels that are associated with class labels and have no duplicates. The proposed channel selection method greatly reduces the number of channels required while improving the average classification accuracy.
펄스전류 활성 소결에 의해 제조된 나노크기의 TiAl계 금속간화합물의 미세구조와 기계적 특성에 미치는 고에너지 기계적 밀링시간의 영향
강덕수 ( Duck Soo Kang ),김지영 ( Ji Young Kim ),우기도 ( Kee Do Woo ),김상혁 ( Sang Hyuk Kim ),박상훈 ( Snag Hoon Park ),( De Liang Zhang ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.2
The aim of this study was to determine the effect of high-energy mechanical milling (HEMM) time and sintering temperature on microstructure and mechanical properties of the TiAl composite fabricated by pulse current activated sintering. TiAl intermetallic powders were milled by HEMM for 1h, 4h, and 8h respectively. Thermal analysis was used to observe the phase transformation of the milled TiAl powders. The sintering time decreased with increase of milling time. The hardness and fracture toughness of the sintered specimens also was improved with increasing milling time. The grain size of the sintered specimens which was milled for 4h was in the range of 50~100 nm.