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범용 유동해석 데이터 형식을 이용한 유동소음 수치해석 프로그램 개발
최익황(I. H. Choi),김연호(Y. H. Kim),김준희(J. H. Kim),임태균(T. G. Lim),전완호(W. H. Jeon) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Recently, the noise problem has been recognized as a serious problem in addition to pollution such as fine dust due to industrialization. In this paper numerical analysis methods using computational fluid dynamics (CFD) and computational aeroacoustics (CAA) was performed using the CFD general notation system (CGNS) and developed the S/W for visualizing the analyzed result of flow noise. The aerodynamic noise analysis S / W has been developed to deal larger models and larger grids.
김현기,김완호,서정환,홍기환,신효근,고도홍 한국음성과학회 1998 음성과학 Vol.3 No.-
Dysarthrias are a sort of neuromotor disorders because of the weakness of neuromotor controls. They are classified in six types on the basis of Mayo clinic research: flaccid, spastic, ataxic, hypokinetic, hypekinetic and mixed types. Five dysarthria types are investigated in this study. MRI, EMG, neuropathological tests are essential diagnostic processing. Visi-Pitch and Spectrgraphy, CSL are used for assessing dysarthria speech. Maximum phonation time, diadochokinetic rate, Voice Onset Time and substitution rate are the speech evaluation parameters. Maximum phonation time and diadochokinetic rates are the lowest in case of spastic and ataxic dysarthria. Spastic dysarthria shows the substituted glottalized consonants. However, flaccid, ataxic and hypokinetic dysarthrias show the substituted aspirated consonants. VOT is the longest for hypokinetic dysarthria and the shortest for ataxic dysarthria. Jitter shows higher percentage in comparison with control group. Speech evaluation using experimental phonetic instruments help create on international standardization of speech evaluation for speech disorders. Keywords: dysarthria, neuromotor, diadochokinetic rate, jitter, shimmer, VOT, formant