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RISS 인기검색어
- 검색키워드
- 저자 : Ynng, Yoon-Soo (검색결과 2 건)
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홍기환,이화욱,김진성,이은정,소상수,최동일,양윤수,Hong, Ki-Hwan,Lee, Hwa-Uk,Kim, Jin-Sung,Lee, Eun-Jung,So, Sang-Soo,Choi, Dong-Il,Ynng, Yoon-Soo 대한후두음성언어의학회 2006 대한후두음성언어의학회지 Vol.17 No.2
Background and Objectives : Voice onset time(VOT) is defined as the time interval from oral release of a stop consonant to the onset of glottal pulsing in the following vowel. VOT is a temporal characteristics of stop consonants that reflects the complex timing of glottal articulation relative to supraglottal articulation. Stop consonants are characterized by creation of a pressure difference across a complete occlusion in the vocal tract, followed by a sudden release 'burst' due to opening that occlusion. The objects of this study is to evaluate a usefulness of voice onset time in the assessment of voice disorderd patients. Subjects : Subjects were 20 adults with normal voice and with benign laryngeal disorders. Subjects with voice disorders represented the following vocal pathologies : vocal polyp, vocal nodule, Reinke's edema and unilateral vocal fold paralysis(UVFP). Control subjects were matched for age (21-40 yews old) and sex(male) with the voice disorders subjects and had normal vocal qualities with no history of voice disorders. Methods : Each voice-disordered and matched control subject read the test passages containing three types of Korean bilabial consonants. VOT measures were made for the initial $/p/p^h/\;and\;/p'/$. VOT was measured using acoustic waveform or wide band spectrogram. Results : For each voiceless stop consonants, there was a significant difference in VOT between the voice disordered and normal subjects. The mean VOTs of the lax stops in UVFP was significantly shorter than those of control subjects in the UVFP. The mean VOTs of the aspirated stops in the vocal polyp and nodule were longer than those of control subjects, but not significant. The mean VOTs of the glottalized in voice disordered groups were longer than those of control subjects, and significant statistically in the UVFP. Conclusions : VOT may be a clinically useful acoustic parameter in the assessment of voice disordered patients, especially in the unilateral vocal fold paralysis.
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DEA 용액으로부터 히드라진의 환원 반응에 의한 니켈 분말 제조
최은영,이윤복,윤석영,김광호,김진천,임영목,김형국,김양도,Choi, Eun-Young,Lee, Yoon-Bok,Yoon, Suk-Young,Kim, Kwang-Ho,Kim, Sin-Chun,Rhyim, Yaung-Mok,Kim, Hyong-Kuk,Kim, Ynng-Do 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.6
Nickel powders synthesized by the reduction of hydrazine of nickel salts fiom diethanolamine(DEA) solution, and investigated the morphological characteristics of nickel powders with the addition of hydrazine, reaction temperature, the composition of mixed solvents. The addition of hydrazine in DEA solution largely affected on size control of nickel powders. Under $N_2H_4/Ni^{2+}$ molar ratio= 1.5 and 2.0 conditions, spherical nickel powders in the submicron range obtained, owing to higher the reduction rate. An increase of temperature increased the size of nickel particles. At $220^{\circ}C$ for 40 min, the nickel powders composed of polyhedral particles with high crystalline in the submicron range. The mixed volume ratio of TEA to DEA affected on the increase of particle size and the inhibition of agglomerate between particles.
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