성대주입술을 결합한 음성치료의 효과 연구

안철민,정화원,신정은,Ahn, Cheol Min,Jung, Hwa Won,Shin, Jung Eun 대한후두음성언어의학회 2017 대한후두음성언어의학회지 Vol.28 No.1

Background and Objectives : Though voice therapy is proven to be effective in academia, treatment results and satisfaction level are inconsistent in clinics. The inconsistency may rise from diverse vocal cords misuse patterns in patient population as they suffer from different diseases or have bad phonation habits. In order to overcome the limitation, we uniformized patients' vocal cords with injection laryngoplasty prior to voice therapy. The efficacy of voice therapy and consistency in treatment results after injection laryngoplasty were assessed. Materials and Methods : Patients diagnosed with vocal nodules were either treated with injection laryngoplasty followed by voice therapy (combined treatment group) or voice therapy only (voice therapy group). Each group consisted of 15 patients. Acoustic measures (jitter, shimmer, NHR), aerodynamic measures (MPT, Psub, MAFR), and subjective auditory conscious measures (K-VHI, K-VRQOL) between two groups were analyzed. Results : After treatments, both groups improved in terms of acoustic, aerodynamic, and subjective auditory conscious measures compared to pre-treatment. Combined treatment group had statistically significantly greater improvement in shimmer, P in K-VHI, and PF in K-VRQOL compared to voice therapy group. Conclusion : Injection laryngoplasty treatment prior to voice therapy synergizes in treating patients compared to voice therapy only.

전치 증폭기 공유 기법을 이용한 8-bit 10-MSample/s Folding & Interpolation ADC

안철민,김영식,Ahn, Cheol-Min,Kim, Young-Sik 한국전기전자학회 2013 전기전자학회논문지 Vol.17 No.3

본 논문에서는 8bit 10Ms/s CMOS Folding and Interpolation ADC를 제안한다. 회로에 사용한 구조는 FR(Folding Rate)이 3, NFB(Number of Folding Block)가 4, IR(Interpolation rate)이 8이며, 제안된 전치 증폭기(Preamplifier) 공유 기법을 회로에 사용하여 같은 구조에서 요구하는 전치 증폭기 수를 절반으로 줄여서 전력소모와 유효면적을 줄이도록 설계하였다. 제안된 ADC는 0.35[um] CMOS 디지털 공정을 사용하여 제작하였고, 유효칩 면적은 3.8[$mm^2$] ($1.8[mm]{\times}2.11[mm]$) 이고, 3.3[V], 샘플링 주파수 10[MHz]에서 20[mA]의 DC 전류소모를 나타내었다. INL은 -0.57, +0.61 [LSB], DNL은 -0.4, +0.51 [LSB]으로 측정되었고, 주파수 100[kHz] 정현파 입력신호에서 SFDR은 48.9[dB], SNDR은 47.9[dB](ENOB 7.6b)로 측정되었다. In this paper, a 8bit 10Ms/s CMOS Folding and Interpolation analog-to-digital convertor is proposed. The architecture of the proposed ADC is based on a Folding & Interpolation using FR(Folding Rate)=8, NFB(Number of Folding Block)=4, IR(Interpolation Rate)=8. The proposed ADC adopts a preamplifier sharing method to decrease the number of preamplifier by half comparing to the conventional ones. This chip has been fabricated with a 0.35[um] CMOS technology. The effective chip area is $1.8[mm]{\times}2.11[mm]$ and it consumes 20[mA] at 3.3 power supply with 10[MHz] clock. The INL is -0.57, +0.61 [LSB] and DNL is -0.4, +0.51 [LSB]. The SFDR is 48.9[dB] and SNDR is 47.9[dB](ENOB 7.6b) when the input frequency is 100[kHz] at 10[MHz] conversion rate.

성대내낭종에서 성대내바늘기법의 효과

안철민,Ahn, Cheol Min 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.1

Background and Objectives : Surgery is considered the primary treatment for intracordal cyst. However, patients who had undergone surgery are still subject to recurrence and continued voice changes. Intracordal cysts naturally disappear in some patient population. Cyst does not always recur in patients who had received partial surgical removal, too. Contradicting results raises a question whether complete surgical removal of intracordal cyst is necessary and demonstrate need for better treatment. Herein, the author proposes novel surgical method technique intralaryngeal needle technique (INT), a technique using surgical needle for not only injection but also for aspiration and excision of cyst. This study aims to examine the potential of intralaryngeal needle technique in treating intracordal cysts. Materials and Methods : Surgical procedures were done on in-patients diagnosed with intracordal cyst. 23 patients received follow-up screening after the surgery for one year. Patients' subjective satisfaction levels, acoustic measures, aerodynamic measures, laryngeal stroboscopic results were compared before and after the treatment. Results : Overall patients were satisfied with novel surgical excision method. In terms of aerodynamic measures, maximum phonation time, mean air flow rate improved after the surgery. In terms of acoustic measures, Jitter, Shimmer, NHR, and voice pitch changes after the treatment showed statistically significant differences. Laryngeal stroboscopy results showed significant decreases in cyst sizes. Post-surgery patients had improved mucosal waves and amplitudes values. Conclusion : The results show the validity of intralaryngeal needle technique in reducing intracordal cyst size by excision, aspiration, and injection. The author believes this novel technique can be used as an alternative surgical method for intracordal cysts.

찬바람이 부는 계절 걱정되는 호흡기질환 A to Z

안철민,An, Cheol-Min 대한결핵협회 2007 보건세계 Vol.55 No.11

말더듬에서 언제 보툴리늄독소주입술이 효과적인가에 관한 연구

안철민,Ahn, Cheol Min 대한후두음성언어의학회 2015 대한후두음성언어의학회지 Vol.26 No.1

Background and Objectives:Laryngeal hyperkinetic movements of stuttering patients is similar to that of adductor spasmodic dysphonia. There has been studies on implementing botulinium toxin injections to treat stuttering. However, the opinions on the bouolinium toxin injection's effects on stuttering patients vary. In this study authors aim to figure out when the botulinium toxin injection improves stuttering patients. Materials and Methods:Stuttering patients who could receive botulinium toxin injection participated in this study. Age differences, gender differences, electroglottogrphic test, aerodynamic test in botulinium toxin injection treatment of stuttering were analyzed. Results:The botulinium toxin injection had statistically significant impact on patients who showed low mean air flow rate during aerodynamic study. Conclusion:The botulinium toxin injection could reduce stuttering of patients with low mean air flow rate in aerodynamic study.

음성장애환자의 음성치료 후 만족도 연구

안철민,신익서,신정은,Ahn, Cheol Min,Shin, Ik Seo,Shin, Jeong Eun 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.1

Background and Objectives : Voice therapy is proven to be effective, but patients are reluctant to receive the therapy when physicians recommend it. This phenomenon may due to patients'lack of trust in or low satisfaction level of the therapy. This study aimed to evaluate patients'satisfaction level after voice therapy and identify factors that could increase the satisfaction. Materials and Methods : First, the fraction of patients who were recommended voice therapy ahead and completed it was studied, and survey was conducted on those who finished ten voice therapy sessions. The patients'1) satisfaction level during the therapy, 2) satisfaction level about physician's explanation about the therapy, 3) willingness to recommend, 4) satisfaction level about the results were assessed, and was correlated with overall satisfaction level. In each category, patients' gender-, age-, and disease type-related differences were analyzed. Results : Patients under 19 years old were most satisfied during the voice therapy; patients above 40 years old showed statistically significantly higher satisfaction level regarding satisfaction with physician explanation about treatments and with treatment results compared to other ages groups. Patients above 40 also showed the highest willingness to recommend. 26.5% of patients either refused to or discontinued voice therapy. 84.3% were satisfied with treatment results. Considering variabilities among factors, patients'satisfaction with physician explanation about treatment and willingness to recommend had positive correlation. Conclusion : Though 26.3% of patients received voice therapy when physicians recommended, patients who completed the therapy were overall satisfied.

호흡곤란을 동반하는 과민성 후두 증후군

안철민,Ahn, Cheol Min 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.1

An irritable larynx syndrome is characterized by a sudden episodic dyspnea and dysphonia that is difficult to diagnose, and patients are often treated unnecessarily and/or too much. A correct diagnosis can be made by monitoring the larynx closing in the reversed direction during inhalation and posterior chink with videolaryngoscopy and by measuring a decrease in air flow volume during inhalation with a lung function test. Patients can be effectively treated with thorough differential diagnosis. Medications targeting precipitating factors, physical therapy sessions to improve abnormal larynx movement, counseling to reduce patients'anxiety rising from dyspnea, and etc. can effectively alleviate symptoms.

폐결핵, 누구냐 넌?

안철민,An, Cheol-Min 대한결핵협회 2007 보건세계 Vol.54 No.5

기관지내 발생한 신경초종 2예

안철민 ( An Cheol Min ),이흥범 ( Lee Heung Beom ),이용철 ( Lee Yong Cheol ),이양근 ( Lee Yang Geun ) 대한결핵 및 호흡기학회 2000 Tuberculosis and Respiratory Diseases Vol.49 No.2

제5차 대한간학회 춘계학술대회 초록집 : 혈청 NAD glycohydrolase 활성도-진행성 간질환의 생화학적 표지자

안철민 ( An Cheol Min ),김대곤 ( Kim Dae Gon ),안득수 ( An Deug Su ),한명관 ( Han Myeong Gwan ),김우현 ( Kim U Hyeon ) 대한간학회 1999 Clinical and Molecular Hepatology(대한간학회지) Vol.5 No.1(S)