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엘리베이터 조닝 계획(수직 구획)에 따른 고층 건물에서의 동절기 압력분포 특성 분석
조재훈,김초롱,김광우 대한건축학회 2007 대한건축학회논문집 Vol.23 No.5
This paper deals with the effect of elevator vertical zoning on pressure distribution caused by stack effect in high-rise buildings where the heights of passenger elevator shafts are the key parameter that affects the magnitude and distribution of stack pressure. First, survey was made to know the present status of elevator vertical zoning plan in high-rise residential buildings. As a result of the survey, two zone type that compart whole building into upper floors and lower floors was most common type and there were several cases according to the numbers and methods of vertical zoning. Next, using the CONTAMW, airflow simulations were performed to understand characteristics of pressure distribution of such cases: single zone type, two zone type one, and multi zone type elevator zoning. Sky lobby elevator system used in super high-rise buildings over 70th floors was also evaluated to investigate the potential problems.
폐쇄성수면무호흡 환자에서 Videofluoroscopy를 사용한 폐쇄부위 연구
조재훈,최혜랑,한규진,이지연,홍석찬,김진국 대한비과학회 2019 Journal of rhinology Vol.26 No.1
Background and Objectives: Upper airway obstruction can occur at the soft palate, tongue base, or epiglottis among obstructivesleep apnea (OSA) patients. Detection of these obstruction sites is very important for choosing a treatment modality forOSA. The purpose of this study was to evaluate the obstruction site of OSA patients and its association with mouth opening andhead position. Subjects and Method: Forty-eight consecutive patients with suspicion of OSA were enrolled and underwent videofluoroscopyto evaluate the obstruction site, as well as polysomnography. Obstruction site, mouth opening, and head position wereevaluated on videofluoroscopy, and their association was analyzed. Results: According to the videofluoroscopy, 47 (97.9%) of 48 patients showed an obstruction in the soft palate, while 24 (50.0%)were located in the tongue base and 14 (29.2%) in the epiglottis. Multiple obstructions were observed in many patients. Meanapnea-hypopnea index was higher among patients with tongue base obstruction (42.3±26.7) compared to those without obstruction(26.4±21.2, p=0.058). However, epiglottis obstruction did not influence apnea-hypopnea index. Mouth opening did notshow any association with tongue base obstruction (p=0.564), while head flexion was highly associated (p<0.001). Conclusion: Half of patients with OSA have tongue base obstruction, which worsens the apnea-hypopnea index. Head flexionis associated with tongue base obstruction, while mouth opening is not.
외골격 로봇의 동작인식을 위한 보행의 운동학적 요인을 이용한 보행유형 분류
조재훈,봉원우,김동현,최현기,Cho, Jaehoon,Bong, wonwoo,Kim, donghun,Choi, Hyeonki 대한의용생체공학회 2017 의공학회지 Vol.38 No.3
외골격 로봇은 군사, 산업 및 의료와 같은 다양한 분야에서 사용되도록 개발된 기술이다. 외골격 로봇은 착용자의 움직임을 감지하여 작동한다. 외골격 로봇이 착용자의 일상적인 행동을 인지함으로써 착용자를 신속하게 보조하고 시스템을 효율적으로 활용할 수 있다. 본 연구에서는 피실험자로부터 얻은 운동학적 데이터를 통해 LDA, QDA, kNN을 활용하여 보행유형을 분류한다. 보행은 주로 일상생활에서 수행되는 일반보행과 계단보행을 선정하였다. 피실험자에게 7개의 IMUs 센서를 정해진 위치에 부착하여 운동학적 요소를 측정 하였다. 결과적으로, LDA는 78.42%, QDA는 86.16%, kNN는 k값에 따라 87.10% ~ 94.49%의 정확도로 분류하였다. The exoskeleton robot is a technology developed to be used in various fields such as military, industry and medical treatment. The exoskeleton robot works by sensing the movement of the wearer. By recognizing the wearer's daily activities, the exoskeleton robot can assist the wearer quickly and efficiently utilize the system. In this study, LDA, QDA, and kNN are used to classify gait types through kinetic data obtained from subjects. Walking was selected from general walking and stair walking which are mainly performed in daily life. Seven IMUs sensors were attached to the subject at the predetermined positions to measure kinematic factors. As a result, LDA was classified as 78.42%, QDA as 86.16%, and kNN as 87.10% ~ 94.49% according to the value of k.
조재훈,최지호,Jeffrey D. Suh,류승호,조석현 대한이비인후과학회 2016 Clinical and Experimental Otorhinolaryngology Vol.9 No.1
Objectives. Obesity is considered to be one of the most important risk factors for obstructive sleep apnea (OSA) but less is known about the role of ethnicity in OSA. The purpose of this study was to investigate the interethnic difference of obesity-related phenotypes in OSA and to reveal the role of ethnicity in OSA. Methods. We searched MEDLINE, LILACS, Scopus, and the Cochrane Library using the key words “sleep apnea,” “body mass index,” “neck circumference,” “waist circumference,” “waist to hip ratio,” etc. Inclusion criteria were adults over 18 years of age, and studies that included polysomnography, obesity-related parameters, and a clear demarcation of ethnicity in the patient population. Included studies were reviewed by 2 independent reviewers. The following information was collected for controls and OSA: number, age, gender, country, ethnicity (Asian or Caucasian), study design, apnea-hypopnea index/respiratory disturbance index, body mass index (BMI), neck circumference (NC), waist circumference (WC), and/or waist to hip ratio (WHR). Results. A total of 8,312 publications were retrieved with a subsequent 19 manuscripts that met the selection criteria. A total of 2,966 patients were included for analysis. The main findings were as follows: There was no difference in BMI, WC, and WHR between patients with OSA and controls after accounting for publication bias; Patients with OSA have greater NC than controls (standard mean difference, 0.89; 95% confidence interval, 0.63 to 1.14); and There was no difference in NC between Asian and Caucasians patients (P=0.178). Conclusion. OSA might not be related with BMI, WC, and WHR. Only NC demonstrated a strong association with OSA, and this finding was not different between Asians and Caucasians.
조재훈 대한수면학회 2020 sleep medicine research Vol.11 No.2
Apnea and hypopnea are generally considered to be equivalent in calculating the apnea-hypopnea index (AHI) regardless of their kind and duration. However, we supposed that apnea and hypopnea could differ in their effects on arousal and oxygen desaturation, and that the duration of an occurrence of apnea or hypopnea could also be important. The following were analyzed for 182 cases of polysomnography in obstructive sleep apnea (OSA) patients. 1) We calculated the correlations between variables, such as AHI, arousal index, oxygen desaturation index (ODI), apnea index (AI), hypopnea index (HI), and mean apnea duration, using common statistical procedures. 2) We compared AHI, arousal index, and ODI in patients divided into short and long mean apnea-duration groups. We found that 1) AHI, arousal index, ODI, mean apnea duration, and AI were highly correlated with each other, but HI was not; and 2) arousal index and ODI were higher in the long mean apnea-duration group than in the short mean apnea-duration group. Hence apnea is more important for arousal and oxygen desaturation during sleep than is hypopnea. Longer apnea duration is associated with both more severe OSA and greater arousal and oxygen desaturation.