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안면근육 표면근전도 신호기반 특징 및 근육 선별을 통한 단모음인식
이병현(Byeong-Hyeon Lee),류재환(Jaehwan Ryu),이미란(Miran Lee),김상호(Sangho Kim),Md Zia Uddin,김덕환(Deok-Hwan Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
In this paper, we propose monophthong recognition method using feature and muscle selection based on facial surface EMG signals. We observed that EMG signal patterns may vary according to Korean monophthong pronunciation. The proposed method can recognize Korean monophthong and improve recognition accuracy by selecting muscle and feature rather than by using all of them. Experimental results show that the recognition accuracy of the proposed method using best muscle and best, second features set is better than that using all of muscles and features. The improved average accuracies are 29.13% in kNN, 34.52% in LDA.
저사이클 피로수명에 영향을 미치는 구상흑연주철의 흑연입자수의 영향
김민건(Kim Min Gun),이병현(Lee Byeong Hyeon),유병호(Yoo Byung Ho) 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.1
Low cycle fatigue life of spheroidal graphite cast iron is determined by the morphological parameters of internal graphite. The aim of this study is to clarify the effect of the number of nodular grain of spheroidal graphite cast iron on low cycle fatigue life. Two specimens that have identical average nodular grain size by changing nodular grain volume fraction and different number of nodular grain count was tested. In this paper, the parameter governing fatigue life through fatigue test, the number of nodular grain seriously affect fatigue life and nodular grain size is no longer governing parameter of it.
구상흑연주철의 저주기 피로수명에 미치는 흑연입자수의 영향
김민건(Min Gun Kim),이병현(Byeong Hyeon Lee) 대한금속재료학회 ( 구 대한금속학회 ) 2002 대한금속·재료학회지 Vol.40 No.9
The behavior of crack nucleation and propagation during low cycle fatigue of ductile the cast irons with different nodule counts and similar nodule size have been compared. In spite of similar nodule size, the fatigue life of ductile cast iron with lower nodule count was longer than that with higher one. This fact shows that not only the nodule size but also the nodule count is the factor governing the fatigue life. Meanwhile, the crack nucleation density of the former was notably increased in the early stage of stress cycling, but the increasing rate was diminished greatly in the middle one. Therefore, difference in fatigue life of these specimens could not be explained with the crack nucleation behaviors only. The difference in fatigue life of these specimens can be explained by the easiness of crack coalescence which depends upon the nodule count. Consequently, the effect of the nodule count on the fatigue life was significant because of the importance of crack coalescence and propagation.