Geun‐Hyo Kim

Pusan National University Hospital

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Development of a device for real‐time light‐guided vocal fold injection: A preliminary report

The Laryngoscope (2015)

Wonjae Cha Jung Hoon Ro Soo‐Geun Wang Jeon Yeob Jang Jae Keun Cho

Objectives/Hypothesis Vocal fold injection is a minimally invasive technique for various vocal fold pathologies. The shortcomings of the cricothyroid (CT) membrane approach are mainly related to invisibility of the injection needle. If localization of the needle tip can be improved during vocal fold injection with the CT approach, the current problems of the technique can be overcome. We have conceptualized real‐time light‐guided vocal fold injection that enables simultaneous injection under precise localization. In this study, we developed a device for real‐time light‐guided vocal fold injection and applied it in excised canine larynx. Study Design Animal model. Methods A single optic fiber was inserted in an unmodified 25‐gauge needle. A designated connector for the device was attached to the needle, the optic fiber, and the syringe. A laser diode module was used as the light source. An ex vivo canine larynx model was used to validate the device. Results The location of the needle tip was accurately indicated, and the depth from the mucosa could be estimated according to the brightness and size of the red light. The needle was inserted and could be localized in the canine vocal fold by the light of the device. Precise injection at the intended location was easily performed with no manipulation of the device or the needle. Conclusions Real‐time light‐guided vocal fold injection might be a feasible and promising technique for treatment of vocal fold pathology. It is expected that this technique can improve the precision of vocal fold injection and expand its indication in laryngology. Level of Evidence NA Laryngoscope , 126:936–940, 2016

Vocal fold paralysis

10.1002/lary.25661

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Citations (10)

Development of Ex-vivo Laryngeal Holder Device

Journal of Clinical Otolaryngology Head and Neck Surgery (2017)

Sung‐Chan Shin Eui‐Suk Sung Soo‐Geun Wang Hyun‐Keun Kwon Da‐Woon Jung

Objectives: It is important to observe vocal fold vibration in detail for phonatory research. Ex-vivo larynx is a representative universally used material for phonatory research. We developed a new ex-vivo larynx holder device to fix the larynx more easily and to provide vocal fold adduction effectively for ex-vivo larynx experiments. To evaluate the utility of this laryngeal holder device, we performed two-dimensional videokymography (2D VKG) Methods: We developed the new ex-vivo laryngeal holder device for mounting ex-vivo larynx. The 2D VKG was used to assess the vocal fold vibration of ex-vivo canine larynx fixed with our ex-vivo larynx holder device. Results: Our ex-vivo larynx holder device provided fixing the ex-vivo larynx more easily and fast without additional arytenoid approximation. With this ex-vivo laryngeal holder device, we could evaluate ex-vivo canine vocal fold vibration successfully using 2D VKG without additional arytenoid approximation and mucosal dehydration. Conclusions: This newly developed ex-vivo laryngeal holder device is expected to help the phonatory researchers to study vocal cord movement more easily. (J Clinical Otolaryngol 2017;28:219–224)

Ex vivo

Vocal folds

10.35420/jcohns.2017.28.2.219

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Usefulness of Direct Magnitude Estimation (DME) in Auditory Perceptual Assessments Measuring Dysphonia Severity

Journal of Voice (2022)

YeonWoo Lee HeeJune Park Lim Dong-Won Geun‐Hyo Kim

Auditory stimuli

Auditory perception

10.1016/j.jvoice.2022.09.001

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Citations (2)

The Usefulness of Multi Voice Evaluation for Measuring Voice Recovery After Endolaryngeal Phonomicrosurgery in Patients with Vocal Fold Polyps

Journal of Voice (2021)

YeonWoo Lee Hee J. Park In Ho Bae Soon-Bok Kwon Geun‐Hyo Kim

Voice analysis

Cepstrum

10.1016/j.jvoice.2021.06.025

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Citations (1)

Resonance Characteristics in Epiglottic Cyst: Formant Frequency, Vowel Space Area, Vowel Articulatory Index, and Formant Centralization Ratio

Journal of Voice (2021)

YeonWoo Lee Hee June Park In Ho Bae Geun‐Hyo Kim

Vocal tract

10.1016/j.jvoice.2021.09.008

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Citations (4)

Auditory-Perceptual and Acoustic Assessment in Measuring Dysphonia Severity of Vocal Fold Nodules

The Journal of the Korea Contents Association (2018)

Geun‐Hyo Kim Soon-Bok Kwon

10.5392/jkca.2018.18.01.108

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A Study of the Speech Characteristics of Elderly Speakers by Simultaneous Measuring Alternating DDK and Vowel Spaces

Journal of speech-language & hearing disorders (2022)

Dong-Won Lim Geun‐Hyo Kim Hee-June Park

목적 : 본 연구는 노년층을 대상으로 단모음, alternate motion rate (AMR), sequential motion rate (SMR), vowel space area (VSA)에 대한 상관성을 확인하고, 교호운동 과제에 모음공간특성 파악을 위한 모음을 조합하여 말 특성 및 운동 구어 능력과 명료도를 측정해보고, 노인을 대상으로 신속한 말 특성 및 운동 구어 능력과 명료도 측정에 도움을 주고자 한다.BR방법 : 연구 대상은 정상 노년층(65∼82세)과 청년층(21∼50세)으로 각 20명으로 하였다. 모음종류에 따른 AMR, SMR, 모음공간 특성에 차이가 있는지 비교하기 위하여 vowel space area (VSA), vowel articulatory index (VAI), formant centralization ratio (FCR), F₂ ratio값의 차이를 비교하였다.BR결과 : 다음의 결과에서 청년집단이 노인집단보다 유의하게 높았다. 1)AMR, 2)SMR: /papipu/, /tatitu/, /kakiku/, /patiku/, 3)VSA: 단모음, 4)VAI: 단모음, AMR: /pa/, /pi/, /pu/, SMR, 5)F₂ ratio: 단모음: /pi/, /pu/. 반면 FCR값은 VAI값과 반대로 청년집단이 노인집단보다 단모음, AMR: /pa/, /pi/, /pu/, SMR 과제에서 유의하게 낮게 측정되었다.BR결론 : 노년집단과 청년집단과의 교호운동 속도와 모음삼각도의 특성에 대하여 알아보고 그 수치를 비교하여 제시하였으므로, 추후 정상 노년층에 대한 비교 자료로 임상에서 활용될 수 있을 것으로 판단된다. 또한 동시 과제를 측정할 수 있는 소프트웨어가 개발된다면 임상현장에서 빠르게 명료도를 측정해 볼 수 있고 치료 전 · 후를 비교 해 볼 수 있을 것으로 사료 된다.

10.15724/jslhd.2022.31.4.027

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음성 떨림 측정을 위한 AVTI(Acoustic Voice Tremor index)의 개발과 검증

Phonetics and Speech Sciences (2024)

Geun‐Hyo Kim Yeon-Woo Lee

The aim of this study was to develop and validate the Acoustic Voice Tremor index (AVTI) for the acoustic measurement of voice tremor. A total of 71 normal adults and 41 patients with voice tremor participated in the study. Vowels /a/ were recorded for at least five seconds. Three seconds of vowel stable duration were edited to identify measures of 18 variables related to voice tremor using a Praat script. These variables and the overall severity (OS) of auditory-perceptual assessment were used to design the AVTI using linear regression analysis. The linear regression analysis identified four out of the 18 variables as significant, and a regression equation was constructed. Furthermore, internal and external validity studies demonstrated high correlations, with an average of over 0.8. The AVTI demonstrated a high correlation of 0.841 with OS. The AVTI was found to be capable of predicting voice tremor. Further studies should include a larger number of voice samples and a complementary Praat script for further analysis.

10.13064/ksss.2024.16.2.091

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Application of the New Version of the Acoustic Voice Quality Index with Korean Speakers

Eon'eo cheong'gag jang'ae yeon'gu/Communication sciences & disorders (2018)

Geun‐Hyo Kim Yeon-Yoo Lee In-Ho Bae Hee-June Park Soon-Bok Kwon

배경 및 목적 본 연구에서는 한국인 화자에서 정상음성과 병리적 음성을 정량화하는 Acoustic Voice Quality Index (AVQI)의 새로운 회귀식을 제시하여 기존의 회귀식(AVQIv2, AVQIv3)과 비교하고자 하였다. 또한 AVQI 측정치와 청지각적 평가 간의 상관관계도 알아보고, 정상과 병리적 음성을 감별할 수 있는 최적의 절사값 및 진단 예측력도 알아보았다. 방법 한국인 화자 2,369명으로부터 모음연장발성 /아/ 5초와 표준문단 '산책' 읽기를 통해서 녹음하였다. 모음의 안정구간 2초와 읽기샘플 25음절을 연결하여 Praat 스크립트를 적용하여 유성음 분절을 추출하고 AVQI를 측정하였다. 또한 음성장애의 중증도를 평가하기 위해서, 5명의 언어재활사가 두 가지 청지각적 평가(GRBAS의 Grade척도, CAPE-V의 overall severity 척도)를 사용하였다. ê²°ê³¼ 전체 AVQI 측정치는 AVQIv2, AVQIv4-K, AVQIv3 순으로 높았으며, AVQIv3는 나머지 AVQI 측정치들에 비해서 유의미하게 낮았다. 각 버전 모두 정상과 병리적 음성 집단 간에 유의미한 차이를 보였다. AVQI와 청지각적 평가 간에는 .82 이상의 높은 상관관계를 보였고, AVQIv4-K와 상관관계가 가장 높았다. ROC 분석을 통해서 모든 AVQI는 모두 .94 이상의 AUC, 9.5 이상의 LR(+), .2 이하의 LR(−)를 나타내었다. 논의 및 결론 AVQIv4-K는 기존 AVQI 버전에 상응하는 높은 수준의 진단적 성능을 가지는 것으로 여겨진다. Keywords: 음향학적 음성 질 지수, 음향학적 분석, 음성장애, 청지각적 평가, 프랏

10.12963/csd.18556

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Citations (1)

Comparison of Cepstral Analysis Based on Voiced-Segment Extraction and Voice Tasks for Discriminating Dysphonic and Normophonic Korean Speakers

Journal of Voice (2019)

Geun‐Hyo Kim In-Ho Bae HeeJune Park Yeon-Woo Lee

Cepstrum

Mel-frequency cepstrum

Predictability

10.1016/j.jvoice.2019.09.009

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Citations (12)