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수평가진을 받는 직사각형 용기 내 2차 유동의 실험적/수치해석적 연구
변민수,서용권,Byun, Min-Soo,Suh, Yong-Kweon 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.7
Analysis of two-dimensional secondary flows given by an oscillatory motion of a liquid with a free surface in a rectangular container subject to a linear reciprocating force is performed by numerical and experimental methods. FVM is used for the numerical computation of the two-dimensional flows. We considered the effects of the free-surface properties such as the surface tension and the dilatational viscosity. The boundary-layer analysis as well as an experiment is used in establishing the free surface properties. The secondary flow patterns are visualized by a laser sheet. It is shown that the secondary flow patterns predicted by the numerical methods are in good agreement with the experimental results.
변민수(Min-Soo Byun),서용권(Yong-Kweon Suh),하종률(Jong-Yul Ha) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
EGR system reduces the NOx as the mixed gas included in the recirculated exhaust gas decreases combustion temperature. The temperature of recirculated exhaust gas is controlled with the EGR cooler in the EGR system. In this study, we studied cooling effect of the EGR cooler with different a cross-section shapes of tubes and the number of tubes. The results show that the cross-section shapes of tubes and the number of tubes slightly influence the temperature drop of the recirculated exhaust gas.
직선왕복운동하는 직사각형 용기내의 정상 유동에 관한 실험 및 수치해석
변민수(Min Soo Byun),서용권(Yong Kweon Suh) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
Analysis of two-dimensional unsteady flows with a free surface in a rectangular container subject to a linear reciprocating force is performed by numerical and experimental methods. FVM is used for the numerical computation of the two-dimensional flows. We consider the surface tension as well as the viscous/elastic properties of the free surface. One-dimensional analysis as well as experiment is used in establishing the free surface properties. The steady recirculatory flow is visualized by a laser sheet. It is shown that the one-dimensional analysis provides useful informations associated with the free surface properties.
허민정,변민수,김성년,김의태,장준환,권준수,Huh, Min Jung,Byun, Min Soo,Kim, Sung Nyun,Kim, Euitae,Jang, Joon Hwan,Kwon, Jun Soo 대한불안의학회 2012 대한불안의학회지 Vol.8 No.2
Objective : The aim of this study is to evaluate the five-factor model of personality in patients with obsessive-compulsive disorder (OCD) related to obsessive-compulsive symptom severity and the distinct symptom subgroups. Methods : We recruited 95 patients with OCD and 116 normal controls in the study. We used the short version of Revised NEO Personality Inventory and the Yale-Brown Obsessive Compulsive Scale (Y-BOCS) for the assessment. Results : Patients with OCD showed significantly higher scores in neuroticism than normal controls. On multiple linear regression analysis, we found that agreeableness and conscientiousness were associated with the total Y-BOCS scores. On subscale analysis, agreeableness and neuroticism were associated with the obsession subscale scores and only conscientiousness was associated with the compulsion subscale scores. Furthermore, we found that patients who have contamination/cleaning or symmetry/ordering/counting/arranging as a main symptom presentation had significantly higher mean scores in conscientiousness than patients who have harm due to injury/violence/aggression as a main symptom presentation. Conclusion : In this study, we found that specific personality factors are associated with the obsessive-compulsive symptom severity. In addition, this is the first study to investigate the relationship between the personality factors in the five-factor model and the distinct symptom subgroups in OCD.
알츠하이머병 치매에서 대뇌 아밀로이드 축적 여부에 따른 임상적 특성의 차이
전소연(So Yeon Jeon),변민수(Min Soo Byun,),이다현(Dahyun Yi),이준호(Jun Ho Lee),최영민(Young Min Choe),김현정(Hyun Jung Kim),백혜원(Hyewon Baek),이준영(Jun Young Lee),이동우(Dong Woo Lee),한나영(Na Young Han),이승훈(Seung Hoon Lee),고 대한노인정신의학회 2016 노인정신의학 Vol.20 No.2
Objective:The present study investigated the clinical characteristics of Alzheimer’s disease (AD) dementia with low brain amyloid-beta (Aβ-AD) burden comparing with AD dementia with high amyloid-beta burden (Aβ+AD). We also developed a prediction model for the amyloid positivity on 11 C-labelled Pittsburgh Compound B (PiB) positron emission tomography (PET) with distinct clinical variables in AD dementia patients. Methods:Fifty-nine clinically defined AD dementia individuals, who participated in the Korean Brain Aging Study for Early diagnosis and prediction of AD (KBASE) study, were included. All the subjects received comprehensive clinical evaluations and PiB-PET. Based on cerebral PiB retention, all subjects were divided into Aβ+AD (n=47) and Aβ-AD (n=12) subgroups. To develop a prediction model for amyloid positivity, stepwise multiple logistic regression analysis was conducted. Results:When compared to Aβ+AD, Aβ-AD showed older age, later age-at-onset, and lower education. In regard of risk factors for dementia, Aβ-AD had higher frequency of hypertension and diabetes mellitus as well as lower frequency of apolipoprotein E (APOE) ε4 allele. Although there was no between group difference in Clinical Dementia Rating (CDR) or CDR sumof-boxes scores, mini-mental state examination and constructional recall scores were higher for Aβ-AD than Aβ+AD. The final amyloid positivity prediction model included APOE4 genotype, hypertension, and diabetes mellitus. Conclusion:The findings from this study indicated that clinically diagnosed AD dementia may have high possibility of not being pathological AD if they have older age and higher vascular risks, and did not have APOE4 genotype.
홍성희(Sung-Hee Hong),변민수(Min-Soo Byun) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
Air side heat transfer and pressure drop for air-cooled heat exchanger with 14mm outer diameter of tube were measured for various fin types - plain fin, wavy fin and slit fin. Experiments were done with dry surface condition and the same fin pitch for 2.3mm. The results show that heat transfer for slit fin type Ale is excellent among the others.
이준호(Jun Ho Lee),최영민(Young Min Choe),변민수(Min Soo Byun),최효정(Hyo Jung Choi),백혜원(Hyewon Baek),손보경(Bo Kyung Sohn),이동영(Dong Young Lee) 대한노인정신의학회 2014 노인정신의학 Vol.18 No.2
Objective:The aims of this study were to investigate the prevalence of co-morbid depression and related factors of depression in mild cognitive impairment (MCI) patients. Methods:Nine hundred and six MCI individuals were included in this study. Depression was defined as major and minor depressive disorder according to the Diagnostic and Statistical Manual of Mental Disorders, fourth edition (DSM-IV). Depression-related demographic and clinical factors were also explored through multivariate logistic regression analysis. Results:In MCI patients, the prevalence of depression as defined according to the DSM-IV diagnostic criteria was 1.8% for major depressive disorder, 11.4% for minor depressive disorder, and overall 13.2% for both. Multivariate logistic regression showed that increased prevalence of overall depression was associated with female gender and non-amnestic subtype of MCI. Conclusion:Our findings based on a large number of MCI subjects who visited memory clinic indicated that more than ten percent of MCI patients have comorbid depression. In addition, female and non-amnestic subtype of MCI patients seems to be more vulnerable to depression.