• 대한후두음성언어의학회지
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• 제16권1호
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• pp.5-9
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• 2005

Background and Objectives : Glottal area waveform(GAW) shows the plot of glottal area versus time through the 1 cycle. This study is designed to see how it can be applied to laryngeal patients. Material and Methods : A GAW analysis was peformed on 11 patients before and after surgery and 22 persons without laryngeal problems were recruited for control. Acoustic and aerodynamic analysis with VHI(voice handicap index) evaluation were performed. Results. Significant changes in baseline offset, gross closing rate and VHI were observed postoperatively. Other parameters were changed but insignificant. Conclusion : GAW maybe used to evaluate patient with voice problems.

• 대한후두음성언어의학회지
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• 제9권1호
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• pp.71-78
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• 1998

Type Ⅰ thyuroplasty in conjunction with arytenoid adduction is one of the excellent techniques in the treatment of unilateral vocal fold paralysis. But perioperative objective evaluation of the patients is difficult. With the development of the videostroboscopy and image analysis program, we could quantify the Glottal Area Waveform(GAW) in patients with unilateral vocal fold paralysis and investigated the relationship between the glottal area and aerodynamic and acoustic parameters. Eight female patients who were performed type Ⅰ thyroplasty in conjunction with arytenoid adduction and 5 females with normal vocal function were involved in this study. Preoperative and postoperative videostroboscopy and vocal function study wire performed. GAW was analysed quantitatively with image analysis program (Kay Stroboscope Image analysis, KSIP) Peak Glottal Area(PGA), Baseline Offset(BO), and Closing Phase(CP) were increased in patients with unilateral vocal fold paralysis and they were reduced after the operation. Mean flow Rate (MFR) was well correlated with the PGA in normal control group and unilateral vocal fold paralysis patients. Noise to harmonic ratio(NHR) was correlated with PGA only in preoperative unilateral vocal fold paralysis patients. In conclusion quantitative measurement of the GAW is useful method in evaluation of unilateral vocal f31d paralysis patients.

• 음성과학
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• 제10권1호
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• pp.15-25
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• 2003

A laryngograph was developed to measure the open and closed movements of vocal folds in our laboratory. This study attempted to evaluate its performance by comparing its glottal data with that of the original laryngograph. Ten normal Korean adults Participated in the experiment. Each subject produced a sustained vowel /a/ for about five seconds. This study compared f0 values, contact quotients of the duration of closed vocal folds over one glottal pulse, and area quotients of the closed over open vocal folds derived from glottal waves using both the original and new laryngographs. Results showed that the mean and standard deviation of the two laryngographs were almost comparable with a correlation coefficient 0.662 but minor systematic shift below those of the original laryngograph was observed. The absolute mean difference converged into 1 Hz, which indicates a possibility of adopting some threshold of rejecting inappropriate pitch values beyond a threshold value. The contact quotient of the normal subjects came out slightly over the 50% in a citation speech. Finally, the area quotient converged into 1. We will pursue further studies on the abnormal patients in the future.

• 대한후두음성언어의학회지
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• 제8권1호
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• pp.5-11
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• 1997

비디오스트로보스코피를 이용한 성대주기(glottal cycle)의 관찰은 질환의 감별 및 치료 전후의 결과를 비교하는데 중요한 정보를 제공하지만, 관찰자의 주관적 견해나 판단능력에 따라 결과의 판독에 많은 영향을 미칠 수 있다. 이에 비디오스트로보스코피 소견의 객관화를 위한 시도가 최근 보고되고 있으나 아직은 그 성과나 결과 등이 참고치로 활용하기에는 부족한 실정이다. 이에 저자들은 정상 성인을 대상으로 발성시의 주파수와 강도의 변화에 따른 glottal cycle의 변화를 정량화 함으로써 추후 연구나 임상적용 등의 기본자료로서 활용하고자 하였다. 정상성인 남녀 각 5명을 대상으로 평상시 대화수준, 고음, 큰 소리의 세 가지 조건에서, 지속적인 /이/ 발성을 후두비디오스트로보스코프를 이용하여 녹화한 뒤, image analysis 프로그램(KSIP, Kay Elemetrics Corp., NJ, USA)을 이용하여 glottal area waveform(GAW)과 amplitude/symmetry waveform(A/SW)을 구하였다. 네 개의 연속적인 glottal cycle의 GAW를 이용하여 peak glottal area, opening ＆ closing phase, open quotient, speed quotient, baseline offset 등의 평균값을 각각의 조건에서 비교하여 보았으며, A/SW를 이용하여 성대의 종축을 기준으로 3등분한 뒤 전, 후, 중간 부위에서 성대운동의 진폭과 그 움직임의 양상을 서로 비교하여 보았다. 발성의 조건에 따라 성대주기와 성대운동의 진폭과 그 양상이 달라짐을 객관적으로 판단할 수 있었으나, 이를 참고치나 기준치로 활용하기 위하여는 더 많은 수의 피검자를 대상으로, 발성의 조건을 체계적으로 변화시킨 연구가 뒷받침되어야 하리라고 사료되었다.