http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Yoosik Youn (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Characteristics of sludge hydrolysis by ultrasound and thermal pretreatment at low temperature
김동진,Yoosik Youn 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.9
Ultrasonic treatment and thermal treatment at low temperature were employed together to analyze and compare the effect of temperature on ultrasonic sludge hydrolysis. Waste activated sludge was more susceptible to ultrasound than anaerobic sludge and primary sludge. In ultrasonic treatment of waste activated sludge for 1 hour, △SCOD/(−△VSS) ratio decreased from 2.40 to 0.44, indicating that high COD components were solubilized faster than the low COD components. Ultrasonic treatment increased the temperature significantly and the heat effect on sludge hydrolysis was not negligible. Primary sludge was more susceptible to heat than waste activated sludge. A sequential treatment of heat and ultrasound of primary sludge showed that hydrolysis efficiency was more affected by the ultrasonic power than the temperature and the time duration. In case of waste activated sludge, the overall hydrolysis efficiency increased with the temperature up to 50 ℃, and it remained almost constant at higher temperature. From the results the contribution of shear force by cavitation bubbles decreased at higher temperature. The effects of shear and heat in ultrasonic sludge treatment need to be analyzed separately for the optimum sludge pretreatment.
-
농촌 노인의 스트레스와 주관적 구강건조감의 관련성: 예비조사
조민정 ( Min-jeong Cho ),이은 ( Eun Lee ),염유식 ( Yoosik Youm ),김현창 ( Hyeon Chang Kim ),정은경 ( Eun-kyung Jung ),김진경 ( Jin-kyung Kim ),송근배 ( Keun-bae Song ),최연희 ( Youn-hee Choi ) 대한예방치과·구강보건학회 2017 大韓口腔保健學會誌 Vol.41 No.4
Objectives: Stress is a psychological reaction to stimuli such as anxiety or threat felt by a person either physically or mentally when placed in a difficult situation. Although a relationship between stress and dry mouth has been reported, it remains understudied. The purpose of this study was to investigate the as sociation between stress and subjective dry mouth among the elderly living in a rural region. Methods: A total of 214 people aged ≥60 years living in a rural area were recruited with an informed consent for a cross-sectional analysis. Information about stress and subjective dry mouth was obtained by an interview survey with a constructed questionnaire. Data on other potential confounding factors (in cluding oral factors) such as socio-demographic data, health-related behaviors, the number of remaining teeth, and subjective chewing ability were also gathered at the same time. Logistic regression models were used to analyze the relationship of stress and dry mouth using SPSS. Results: The Crude odds ratio (OR) of stress awareness affecting subjective dry mouth was 2.59 (95% confidence interval: 1.43-4.68). After adjusting for sex, education, income, smoking, and alcohol intake, the adjusted OR was 2.52 (95% confidence interval: 1.30-4.87) which was statistically significant. Conclusions: Elderly people who were stressed had an approximately 2-fold increase in experiencing subjective dry mouth when compared to their stress-free counterparts.
-
박태준 ( Taejun Park ),허효진 ( Hyojin Heo ),조민정 ( Min-jeong Cho ),김현창 ( Hyeon Chang Kim ),염유식 ( Yoosik Youm ),송근배 ( Keun-bae Song ),최연희 ( Youn-hee Choi ) 대한예방치과·구강보건학회 2021 大韓口腔保健學會誌 Vol.45 No.2
Objectives: With the surge in the elderly population, a growing interest in the prevention and treat ment of geriatric diseases has been observed, along with awareness of the severity of problems associated with dementia, a cognitive impairment. The purpose of this study was to investigate the correlation between chewing ability and cognitive function among elderly people residing in a rural area. Methods: A total of 162 elderly individuals, aged between 65 and 97 years, were surveyed. Trained examiners conducted interviews and assessments of chewing ability, on the basis of the num ber of remaining teeth, denture status, masticatory performance evaluating gum, ShadeEye-NCC measuring overall change in color of the gum (ΔE), and T-Scan<sup>®</sup>III analyzing distribution of occlu sion patterns. Cognitive function was assessed using the Korean version of the Mini-Mental State Examination-Dementia Screening (MMSE-DS) tool. Results: Participants with a low score in the MMSE-DS were found to have distinguishably lower denture need, smaller number of remaining teeth, and lesser color change in the masticatory per formance evaluating gum. In the cognitive impairment group, a tendency of having unilateral and anterior occlusion led to occlusal discomfort and chewing difficulties. Conclusions: The study highlights important associations between chewing ability and cognitive function. The finding corroborates that tooth loss may be a predictive risk factor for cognitive im pairment.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
