• Proceedings of the KSLP Conference
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• 1994.06b
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• pp.86-86
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• 1994

후두 전적출술 후 음성의 소실은 환자에게 정신적으로 많은 영향을 주기 때문에 음성의 회복은 환자의 재활에 중요한 부분으로 여러 가지 방법 이 고안되었으나 아직 만족할 만한 방법은 없다. 식도발성은 기구나 손을 사용할 필요가 없이 정상인과 같이 자연스럽게 말할 수 있어 가장 이상적인 음성재활 법이나, 습득하는데 오랜 시간과 노력이 필요할 뿐만 아니라 음성의 질이 나쁜 단점이 있다. 또한 현재까지 식도발성의 성공여부를 예측할 수 있는 방법이나 성공 율을 높일 수 있는 수술법 등에 대한 연구는 많았지만 음성재활을 위한 식도발성의 특성이나 언어의 명료도에 대한 연구는 부족하다. (중략)

• Proceedings of the KSLP Conference
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• 1999.11a
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• pp.183-183
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• 1999

배경 : 주로 palatal defect 환자들의 상악(maxilla)의 결손으로 인한 형태와 기능을 복구시키기 위한 보철적 재활(prosthetic rehabilitation)방법으로 쓰이는 obturator는 비음의 초래를 막고 vocal tract의 모양에 영향을 줄 수 있으나, palatal cancer 환자를 대상으로 말산출(speech production)에 관한 obturator 장착 효과에 대한보고는 거의 없다. 또한 모음은 자음에 비해 더 nasality에 영향을 주며 모음 삼각도의 면적크기가 말 명료도의 객관적인 측정치로 사용될 수 있다. 연구목적 : Palatal cancer 환자의 obturator 장착 전후 모음 산출 측정치를 통해 모음 삼각도의 크기를 비교함으로써, obturator 장착이 말 명료도 개선에 어느 정도의 효과를 주는지 보고자 하였다. (중략)

• The Journal of the Acoustical Society of Korea
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• v.26 no.5
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• pp.182-187
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• 2007

The present study was to investigate the speech intelligibility of esophageal speech, which is the way that the laryngectomized people who lost their voices by total laryngectomy can phonate by using the airstream driven into esophagus, not trachea. Three normal listeners transcribed the CVVand VCV syllables produced by 10 esophageal speakers. As a result, overall intelligibility of esophageal speech was 27%. Affricates showed the highest intelligibility, and fricatives, the lowest. In the aspect of the place of articulation, palatals were the most intelligble, and alveolars, the least. Most of the aspirated consonants showed a low intelligibility. The consonants in VCV syllables were more intelligible than the ones in CVV syllables. The low intelligibility of esophageal speakers is due to insufficient airflow intake into esophagus. Therefore, training to increase airflow intake, as well as correct articulation training, will improve their low intelligibility.

• Phonetics and Speech Sciences
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• v.12 no.3
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• pp.95-103
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• 2020

The current study aimed to identify the characteristics of speech rate and pause in children with spastic cerebral palsy (CP) and their relationships with speech intelligibility. In all, 26 children with CP, 4 with no speech motor involvement and age-appropriate language ability (NSMI-LCT), 6 with no speech motor involvement and impaired language ability (NSMI-LCI), 6 with speech motor involvement and age-appropriate language ability (SMI- LCT), and 10 with speech motor involvement and impaired language ability (SMI-LCI) participated in the study. Speech samples for the speech rate and pause analysis were extracted using a sentence repetition task. Acoustic analysis were made in Praat. First, it was found that regardless of the presence of language impairment, significant group differences between the NSMI and SMI groups were found in speech rate and articulation rate. Second, the SMI groups showed a higher ratio of pause time to sentence production time, more frequent pauses, and longer durations of pauses than the NSMI groups. Lastly, there were significant correlations among speech rate, articulation rate, and intelligibility. These findings suggest that slow speech rate is the main feature in SMI groups, and that both speech rate and articulation rate play important roles in the intelligibility of children with spastic CP.

• KIEAE Journal
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• v.7 no.3
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• pp.63-70
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• 2007

It is known that early reflections, their energy and delay times after the arrival of direct sound are important factors for speech intelligibility. In this basis, acoustical parameters like D50 and C80 had been proposed and are widely used for assessing the listening condition of rooms. These parameters are focused on the fraction of the early energy to the total, regardless of the spatial characteristics of the early reflections. This means that all the early reflections, arrived in certain time boundary. from front, behind, down and upside have the same impact on speech intelligibility. From the questionable simplicity, the influence of the direction of early reflections on speech intelligibility is examined in this study. A computer simulation speech intelligibility test, conducted for 22 university students, found that the reflection of vertical direction with method of the Paired comparison also the preference of 0.746 degree was visible an increase.

• Journal of the Korea Convergence Society
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• v.9 no.6
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• pp.125-132
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• 2018

This study was to investigate the speech sound production characteristics and evaluation aspects of preschool children through word test and connected speech test. For this, the authors conducted Assessment of Phonology and Articulation for Children(APAC) to 72 normal children(24 three-, four-, and five-year-olds each) and analyzed difference in percent of correct consonant(PCC) and intelligibility according to age and sex, correlation between PCC and intelligibility, and speech sound error patterns. PCC and intelligibility increased with age but there was no difference according to sex. The correlation was statistically significant in 5-year-old group. Speech sound error patterns were different in the two tests. This study showed that children's speech sound production varied according to language unit. Therefore, both types of tests should be done to grasp their speech sound production ability properly. This suggests that current standard to identify language impairment only by PCC of word level requires review and further studies.

• The Journal of the Acoustical Society of Korea
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• v.37 no.5
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• pp.363-368
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• 2018

Recently a slat type ceiling is widely used in various spaces, such as music performance spaces and concourse of airport and a general reception area of a building. However, it is hard to find a proper design guideline or material useful in designing such spaces, due to the lack of relevant researches on the effect of a slat ceiling on room acoustics. The present work investigated the effect of a slat type ceiling using a physical scale model method. A 1/20 scale model of a small shoe-box type music performance hall was built and a slat ceiling with different configurations was installed. 6 cases of different ceiling configurations were considered with the combination of 2 slat ceiling height cases and 3 distance cases between slats. The effect of a slat ceiling on the acoustics of a room was evaluated by measuring reverberance($T_{30}$), intelligibility and clarity($D_{50}$ and $C_{80}$), and loudness(G and $G_{80}$).

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.25 no.7
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• pp.462-469
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• 2015

This study was carried out to examine characteristics of various acoustic indicators evaluating speech intelligibility such as reverberation time(T₃₀), D₅₀, C₅₀ and speech transmission index(STI) in Korean elementary school classrooms. Results showed that mean T₃₀ at middle frequencies(500 Hz to 2000 Hz) measured in 9 classrooms was about 0.75 s, which exceeds a regulation specified on American National Standards(ANSI); 0.60 s. Mean D₅₀, C₅₀ and STI were 60 % to 66 %, +2 dB to +3 dB, and 0.65, respectively. The maximum difference in D₅₀ and C₅₀ according to different receiver points in a classroom was 13 % and 2.5 dB, while the maximum difference in T₃₀ was 0.03 s. Whereas STI measured in classrooms has relatively low correlation with other indicators, correlation between D₅₀ and C₅₀ was high, R²=.9964. In addition, T₃₀ and C₅₀ were fitted well as logarithmic regression curve with R²=.9610. It was +3.73 dB in C₅₀ and 68 % in D₅₀ which are the value corresponding to 0.60 s in T₃₀ on this curve.

• Phonetics and Speech Sciences
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• v.13 no.3
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• pp.79-90
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• 2021

This single-subject study examined the effects of repetitive speech training at the word and sentence levels using speech cues on the percentage of correct consonants (PCC) and speech intelligibility of children with cerebral palsy (CP). Three children aged between 5-8 years with a history of CP participated in the study. Thirty-minute intervention sessions were provided four times a week for four weeks. The intervention included repeated training of words and sentences containing target phonemes using two instructions of speech cues, "big mouse" and "strong voice". First, the children improved their average PCC and speech intelligibility, but an effect size analysis indicated that the effect was different for each child, and the effect size for speech intelligibility was higher than for PCC. Second, the intervention effect was generalized to untrained words and sentences. Third, the maintenance effects of PCC and speech intelligibility were very high. These findings suggests that repeated speech training using speech cues is an intervention technique that can help improve PCC and speech intelligibility in children with CP.

• 재활복지
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• v.20 no.3
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• pp.67-82
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• 2016

The purpose of this study was to investigate relation and effect of PCC(Percentage of Correct Consonant) and nasalance score on the speech intelligibility and acceptability in adults with dysarthria by reading task of standardized passage. Ten adults with dysarthria and sixteen normal adults were participated in this study. PCC and nasalance score were measured through reading task of standardized passage. And, speech intelligibility and acceptability were examined using visual analogue criteria. The result of the study was as follows. First, the nasalance score of adults with dysarthria group is significantly higher than normal adults group in reading sample by standardized passage. Second, the PCC, speech intelligibility and acceptability shows significant correlation. However, the nasalance score doesn't show significant corelation with speech intelligibility and acceptability. These results suggest that PCC is closely related to speech intelligibility and speech acceptability, but nasalance score is not related to speech intelligibility and speech acceptability.