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Approximated Posterior Probability for Scoring Speech Recognition Confidence
김규홍,김회린,Kim Kyuhong,Kim Hoirin The Korean Society Of Phonetic Sciences And Speech 2004 말소리 Vol.52 No.-
This paper proposes a new confidence measure for utterance verification with posterior probability approximation. The proposed method approximates probabilistic likelihoods by using Viterbi search characteristics and a clustered phoneme confusion matrix. Our measure consists of the weighted linear combination of acoustic and phonetic confidence scores. The proposed algorithm shows better performance even with the reduced computational complexity than those utilizing conventional confidence measures.
팬터그래프 커버형상에 따른 HEMU-400X 항력의 실험적 분석
이영빈(Yeongbin Lee),곽민호(Minho Kwak),김규홍(Kyuhong Kim),이동호(Dongho Lee) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The aerodynamic drag characteristics of HEMU-400X which has been being developed for the maximum speed of 430km/h were analyzed experimentally as the variations of the pantograph cover configurations to reduce the acoustic noise and the aerodynamic drag of the pantograph system. The wind tunnel tests were performed with three pantograph cover models upon 1/20 scaled 5-car model of HEMU-400X. Two kinds of wedge shapes which induce up-flow in the vicinity of the pantograph and one cone shape which reduces the whole train drag were used in order to compare the aerodynamic characteristics as the pantograph cover shape changes. The each axial force of 5 each car was measured at a time with the test velocities 30 40 50 60m/s. Through the wind tunnel test the base drag forces of HEMU-400x model and the forces by the pantograph cover on the train model were investigated and the aerodynamic drag characteristics of the train model by the pantograph cover configurations were analyzed.