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에어 매트리스와 산소 포화도 측정기를 이용한 수면호흡장애 자동 검출 시스템 개발
정필수,박종욱,주은연,이경중,Jeong, Pil-Soo,Park, Jong-Uk,Joo, Eun-Youn,Lee, Kyoung-Joung 대한의용생체공학회 2017 의공학회지 Vol.38 No.4
The present study proposes a system that can detect sleep-disordered breathing automatically using an air mattress and oxygen saturation. A thin air mattress was fabricated to reduce discomfort during sleep, and respiration signals were acquired. The system was configured to be synchronized with a polysomnography to receive signals simultaneously with other bio-signals. The present study has been conducted with nine adult male and female patients with sleep-disordered breathing, and sleep-disordered breathing events have been detected by applying the signals acquired from the subjects to the rule-based detection algorithm. The sensitivity and positive predictive values were found to evaluate the performance of the system, which are 91.4% and 89.7% for all events, respectively. The comparison of apnea hypopnea index(AHI) between the polysomnography and the proposed method showed squared R-value of 0.9. This study presents the possibility of detecting sleep-disordered breathing at hospitals or homes using the proposed system.
정필수 ( Pil Soo Jeong ),박수진 ( Su Jin Park ),김은미 ( Eun Mi Kim ),박지영 ( Ji Young Park ),박유리 ( Yu Ri Park ),강대영 ( Dae Young Kang ),차현욱 ( Hyun Ouk Cha ),이경기 ( Kyoung Ki Lee ),김성희 ( Seong Hee Kim ),박최규 ( Choi 한국동물위생학회 2016 한국동물위생학회지 (KOJVS) Vol.39 No.2
In the study, we developed and evaluated a uracil N-glycosylase (UNG)-supplemented single-tube nested reverse transcription-polymerase chain reaction (UsnRT-PCR) assay that can carried out first-round RT-PCR and second-round nested PCR in a reaction tube without reaction tube opening and can simultaneously detect EU- and NA-PRRSV. The UsnRT-PCR confirmed to have a preventing ability of mis-amplification by contamination of pre-amplified PRRSV DNA from previous UsnRT-PCR. Primer specificities were evaluated with RNAs extracted from 8 viral strains and our results revealed that the primers had a high specificity for both genotypes of PRRSV. The sensitivity of the UsnRT-PCR was 0.1 TCID50/0.1 mL for EU- or NA-PRRSV, respectively, which is comparable to that of previously reported real time RT-PCR (RRT-PCR). Clinical evaluation on 110 field samples (60 sera and 50 lung tissues) by the UsnRT-PCR and the RRT-PCR showed that detection rates of the UsnRT-PCR was 70% (77/110), and was relatively higher than that of the RRT-PCR (69.1%, 76/110). The percent positive or negative agreement of the UsnRT-PCR compared to RRT-PCR was 96.1% (73/76) or 90.9% (30/33), showing that the test results of both assays may be different for some clinical samples. Therefore, it is recommend that diagnostic laboratory workers use the two diagnostic assays for the correct diagnosis for the relevant samples in the swine disease diagnostic laboratories. In conclusion, the UsnRT-PCR assay can be applied for the rapid, and reliable diagnosis of PRRSV without concerns about preamplified DNA carryover contamination that can occurred in PCR process in the swine disease diagnostic laboratories.
압전센서를 이용한 코골이와 심박 검출을 위한 자동 알고리즘
에르덴바야르,박종욱,정필수,이경중,Urtnasan, Erdenebayar,Park, Jong-Uk,Jeong, Pil-Soo,Lee, Kyoung-Joung 대한의용생체공학회 2015 의공학회지 Vol.36 No.5
In this paper, we proposed a novel method for automatic detection for snoring and heart beat using a single piezoelectric sensor. For this study multi-rate signal processing technique was applied to detect snoring and heart beat from the single source signal. The sound event duration and intensity features were used to snore detection and heart beat was found by autocorrelation. The performance of the proposed method was evaluated on clinical database, which is the nocturnal piezoelectric snoring data of 30 patients that suffered obstructive sleep apnea. The method achieved sensitivity of 88.6%, specificity of 96.1% with accuracy of 95.6% for snoring and sensitivity of 94.1% and positive predictive value of 87.6% for heart beat, respectively. These results suggest that the proposed method can be a useful tool in sleep monitoring and sleep disordered breathing diagnosis.
이영미(Youngmee Lee),정필연(Pil Yeon Jeong),성지은(Jee Eun Sung),심현섭(Hyun Sub Sim) 한국언어청각임상학회 2018 Communication Sciences and Disorders Vol.23 No.4
배경 및 목적: 본 연구에서는 혀 강도가 뇌성마비 아동의 자음 산출에 미치는 영향을 살펴봄으로써, 뇌성마비 아동의 말 평가와 재활 계획 수립에 유용한 정보를 제공하고자 한다. 방법: 본 연구에서는 검사 당시 연령이 5-15세인 뇌성마비 아동 20명을 대상으로 하였다. 대상 아동의 조음위치 및 조음방법에 따른 자음정확도는 아동용 발음평가를 이용하여 평가하였으며, 혀 강도는 Iowa Oral Performance Instrument (IOPI)를 사용하여 평가하였다. 결과: 혀 강도를 기준으로 뇌성마비 아동을 중앙치 반분법에 따라 고집단(10명)과 저집단(10명)으로 나누어서 Mann-Whitney U-test를 실시한 결과, 모든 조음위치와 조음방법에서 고집단의 자음정확도가 저집단에 비해 유의하게 높았다. 전체 뇌성마비 아동을 대상으로 혀 강도, 조음위치 및 조음방법에서의 자음정확도 간의 상관계수의 범위는 .549-.680이었으며(all p < .01), 뇌성마비 아동의 혀 강도는 단어 수준에서의 자음정확도를 유의하게 예측하는 변수로 나타났다(p < .05). 논의 및 결론: 혀 강도가 높은 뇌성마비 아동이 낮은 아동에 비해서 더 정확하게 자음을 산출할 수 있었으며, 뇌성마비 아동의 혀 강도는말 산출 능력을 예측할 수 있는 유의한 변수였다. Objectives: The aims of this study were to examine the tongue strength of children with cerebral palsy (CP) and to identify the relationship between tongue strength and speech production skills at word level in children with CP. Methods: Twenty children with CP participated in this study, and they ranged in age from 5 to 15 years. The children were median-split into two groups (children with higher tongue strength vs. children with lower tongue strength) based on maximal tongue strength. The maximal tongue strength was obtained using the Iowa Oral Performance Instrument. The speech production skills were measured using the Assessment of Phonology and Articulation for Children, and the percentage of consonants correct (PCC) of all children was calculated according to the place and manner of articulation. Results: Children with higher tongue strength obtained significantly higher PCC than children with lower tongue strength. The maximal tongue strength was significantly correlated with PCC of all places and manners of articulation (all p < .01). Maximal tongue strength was a significant predictor of speech production skills in children with CP. Conclusion: Children with higher tongue strength had significantly better speech production skills than children with lower tongue strength. Tongue strength was an important factor accounting for individual differences in speech production skills for children with CP. The results indicate that tongue strength may serve as a clinically critical index in predicting speech production skills in children with CP.