ANALYSIS BY SYNTHESIS FOR ESTIMATION OF DOSE CALCULATION WITH gMOCREN AND GEANT4 IN MEDICAL IMAGE

JEONGOK LEE,JEONGKU KANG,JHINKEE KIM,BUGIL KIM,DONGHYEOK JEONG 대한방사선방어학회 2012 방사선방어학회지 Vol.37 No.3

우리나라 유아들의 시력이상 현황과 그 원인

이은희,이경민,이미선,엄기두,공정옥,민경복,백도명,박강원 서울대학교 보건대학원 2001 서울大學校 保健環境硏究所論叢 Vol.11 No.1

Visual acuity impairment among children can lead to learning and behavioral disabilities. This study was carried out to describe the prevalence and risk factors of visual acuity impairment in Korean preschool children. Subject of this study was aged 4-6 children (n=2179) attending nursery and day-care centers of one district of Seoul City. The children were examined with Standard Visual Chart with diagrams familiar to children. If the visual acuity was equal to or less than 0.6, then it was described as impaired visual acuity. Age and sex were examined as for their associations with impaired visual acuity together with indicators of physical developments such as height, weight, and hemoglobin concentration. Based on the multiple logistic regression using SAS v 8.02, age and low birth weight were significant risk factors for impaired visual acuity, while other factors including parent's smoking history, housing environment, breast feeding history or diet habit were not. The results of this study indicate the importance of fetal environment/experiences in preventing impaired visual acuity. Possible role of incubators for low birth weight babies should also be considered.

수증기 개질 반응로에 대한 열유동 해석

한정옥(Jeongok Han),이중성(Joongseong Lee),이영철(Yeongcheol Lee),홍성호(Seongho Hong),홍성국(Sungkook Hong),동상근(Sangkeun Dong) 한국가스학회 2013 한국가스학회지 Vol.17 No.2

수증기 개질 반응로 설계를 위해 수증기 개질 반응로에 대한 열유동 해석을 수행하였다. 6개의 이중관형 개질기 튜브들과 1개의 버너로 구성된 반응로에 대해 개질반응과 열유동 해석을 연계하여 수치계산을 수행하였다. 버너 형상 변화에 따른 반응로 내에서의 유동구조를 계산하여 버너 형상을 선택하였다. 개질반응 통합해석 결과, 반응로 상하단내에서 온도구배가 크게 나타났으며 개질기 튜브 내의 조성 변화도 반응로 온도분포의 영향을 받는것으로 나타났다. 또한, 운전조건인 SCR 및 GHSV 변동에 따른 개질 반응특성이 변화함을 확인할 수 있었다. A numerical study on the heat and fluid flow has carried out for the design of the steam reforming reactor which consists of six reforming tubes and one burner. Reforming reaction calculation is coupled with the heat and fluid flow one. The burner type in the reforming reactor is chosen through the fluid flow calculation according to different type of burner structure. It is shown that the significant temperature gradient exists in the reforming reactor, affecting the component variation along the length of reforming tube. The component ratio of reforming gas is changed by the variation of SCR and GHSV.

Sex Differences in Lower Urinary Tract Symptoms in Older Korean Adults Living in Rural Areas: Prevalence, Quality of Life, and Associated Factors

Park, Jeongok,Kim, Eun Sook,Lee, Young Joo,Lee, Hyo Serk,Seo, Ju Tae Korean Continence Society 2018 International Neurourology Journal Vol.22 No.3

<P><B>Purpose</B></P><P>Urinary incontinence (UI) is associated with nursing home admission, functional decline, and risk of death among community-dwelling older adults. Little information, however, is available on sex differences in lower urinary tract symptoms (LUTS) in older Korean adults exclusively living in rural areas. This study examined sex-related differences in LUTS, factors associated with UI in older adults living in rural areas, and health-related quality of life (HRQoL) in incontinent older adults.</P><P><B>Methods</B></P><P>This was a cross-sectional study in which face-to-face interviews were conducted at 15 rural community-health centres. A total of 323 older adults aged ≥65 years from rural areas of Korea participated. LUTS prevalence was evaluated and HRQoL was measured using the King’s Health Questionnaire. The chi-square test and t -test were used to examine sex differences in characteristics, LUTS, and HRQoL. Multivariable logistic regression was used to identify risk factors associated with UI.</P><P><B>Results</B></P><P>Nocturia was the most prevalent symptom, affecting 87% of men and 86% of women. Women (53%) had significantly more UI of any kind than did men (35%) (P=0.007). Urgency UI was the most frequent type of UI in men, whereas stress UI was the most frequent in women. Regarding HRQoL, men had significantly higher scores in the domains of sleep/energy disturbances (P=0.032) than did women, and women reported greater effects from the severity of incontinence (P=0.001) than did men. Arthritis was the only factor associated with UI in men (odds ratio [OR], 6.88; 95% confidence interval [CI], 1.46–32.36). However, women with diabetes mellitus were less likely to have UI than those without (OR, 0.43; 95% CI, 0.23–0.82).</P><P><B>Conclusions</B></P><P>LUTS were found to be highly prevalent in community-dwelling older Korean adults in rural areas. Interventions to improve sleep and to reduce UI severity are needed for incontinent men and women, respectively.</P>

Sex Differences in Factors Associated with Falls in Community-Dwelling Older Adults: Using the 2017 National Survey of Older Koreans

Minyoung Lee,Jeongok Park,Sue Kim,Kyung Hee Lee,Gi Wook Ryu 한국간호과학회 2021 한국간호과학회 학술대회 Vol.2021 No.10

Aims: Falls in older adults are a major public health issue, and it results in hospital admission, frailty, disability, burden of treatment, depression, and death. Previous studies have identified falls-related risk factors such as sensory limitations, cognitive impairment, frailty, comorbidities, and physical function. Although these risk factors vary between men and women, especially in older adults, only a few studies have been conducted to investigate the association between sex difference and falls. This study aimed to identify sex differences in the factors associated with falls in community-dwelling older adults in South Korea. Methods: This study was a secondary data analysis using the dataset from the 2017 National Survey of Older Koreans. A total of 10,236 elderly adults aged 65 years and above were enrolled. We excluded 63 who were “unmatched” for falls. Data on frailty, instrumental activities of daily living (IADL); activities of daily living (ADL); depressive symptoms; cognitive functions; chronic health problems; and socio-demographic characteristics were collected. The data were analyzed with descriptive statistics, t-test, Chi-square test, and logistic regressions. Results: This study comprised 4,109 (40.1%) men and 6,127 (59.9%) women, with the majority aged 65 to 74 years (52.1%). In total, 1,619 (15.8%) participants experienced at least one fall in the past year. In men, the factors significantly associated with falls were middle school education (OR=1.471; CI=95% 1.096~1.972), frailty (OR=1.546; CI=95% 1.076~2.220), mild depression (OR=2.205; CI=95% 1.611~3.017), and osteoporosis (OR=3.326; CI=95% 1.958~5.652). In women, the factors significantly associated with falls were living alone (OR=1.331; CI=95% 1.116~1.589), IADL (OR=1.081; CI=95% 1.039~1.126), mild depression (OR=1.944; CI=95% 1.612~2.344), severe depression (OR=1.346; CI=95% 1.113~1.627), osteoporosis (OR=1.303; CI=95% 1.118~1.591), and arthritis (OR=1.158; CI=95% 1.008~1.331). Conclusions: Developing fall prevention programs should consider sex-related differences especially among community-dwelling elderly individuals.

수소스테이션용 제어로직 및 시뮬레이터 개발

이영철(Lee, Youngchul),이중성(Lee, Joongseong),한정옥(Han, Jeongok),홍성호(Hong, Seongho) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11

수소경제사회를 위한 수소인프라 구축에서 가장 중요한 부분이 현지설치형 수소스테이션이라고 하겠다. 이러한 수소스테이션은 일본, 미국, 유럽 등 선진각국에서 2015년에 상용화를 계획한 수소연료전지자동차의 보급에 필요불가결한 설비이므로 이들 지역을 중심으로 수요가 발생할 것으로 보인다. 선진국에서는 수소연료전지자동차의 경우 상용화가 이루어지면 2020년경 그 비율은 전체 자동차의 약 5% 수준을 점유할 것으로 보고 있다. 현재 국내에서도 정부주관으로 2015년부터 보급 목표로 수소연료전지차 모니터링연구가 수행되고 있다. 이에 따라 이미 외국 설비를 중심으로 수소스테이션 실증연구가 이루어졌으며, 각 기업체 및 연구기관에서 개질기, 고압압축기, 디스펜서 등 많은 요소기술 개발에 박차를 가하고 있으며, 이 결과로 향후 수소스테이션 국산화에 많은 기여를 할 것으로 사료된다. 아울러 이번 연구는 수소스테이션의 핵심부분인 수소스테이션용 제어로직을 개발하고 시뮬레이터를 제작한 결과에 대해 발표하고자 한다.

아로마 피부마사지의 통증감소 효과에 관한 연구

이정옥(Lee Jeongok),윤기선(Yun, giseon) 한국여가복지학회 2020 여가복지경영연구(여가복지) Vol.1 No.2

최근 어깨통증과 관련된 경부통증환자들이 늘어나고 있으며, 허리통증과 관련된 극소통증환자가 늘어나고 있는 가운데, 병원약물치료를 원하지 않는 사람들이 늘어나고 있는 가운데 피부관리 샵에서도 아로마를 이용하여 피부마사지를 받거나 아로마향을 흡입하는 경우가 빈번해지고 있다. 이에 본 연구에서 경부통증환자와 극소통증환자를 대상으로 실험군고 비교군으로 나누어 통증감소 효과를 분석하였다. 첫째, 경부통증환자는 아로마오일 피부마사지를 받으면 통증은 사전보다 평균=6.100만큼 감소하는 것으로 분석되었다. 둘째, 경부통증환자는 아로마 향 흡입과 아로마오일 피부마사지를 받으면 통증은 사전보다 평균 =5.767만큼 감소하는 것으로 분석되었다. 셋째, 극소통증환자는 아로마오일 피부마사지를 받으면 통증은 사전보다 평균=3.867만큼 감소하는 것으로 분석되었다. 넷째, 극소통증환자는 아로마 향 흡입과 아로마오일 피부마사지를 받으면 통증은 사전보다 평균 =4.767만큼 감소하는 것으로 분석되었다. 이를 종합하면 경부통증환자는 아로마 향 흡입과 아로마오일 피부마사지를 동시에 하는 것보다 아로마오일 피부마사지 만 받는 것이 더 효과적인 것으로 분석되었다. In recent years, the number of patients with neck pain related to shoulder pain is increasing, and the number of patients with very small pain related to back pain is increasing, and the number of people who do not want hospital drug treatment is increasing. Inhalation is becoming more frequent. Therefore, in this study, the pain reduction effect was analyzed by dividing into an experimental group and a comparison group for cervical pain patients and very small pain patients. First, it was analyzed that in patients with cervical pain, when receiving aroma oil skin massage, the pain decreased by an average = 6.10 than before. Second, it was analyzed that the pain decreased by an average of 5.6767 compared to before in the case of cervical pain inhalation and aroma oil skin massage. Third, it was analyzed that the pain decreased by an average of 3.867 than before in the case of acute pain patients receiving aroma oil skin massage. Fourth, it was analyzed that the pain decreased by an average of 4.767 than before in the case of very pain patients who received aroma fragrance inhalation and aroma oil skin massage. Taken together, it was analyzed that patients with cervical pain were more effective in receiving only aroma oil skin massage than inhaling aroma scent and using aroma oil skin massage at the same time.

수소-압축천연가스(HCNG) 자동차 국내외 개발동향 및 향후과제

이영철(Lee, Youngchul),한정옥(Han, Jeongok),이중성(Lee, Joongseong),채정민(Chae, Jeongmin),홍성호(Hong, Seongho) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06

수소경제로 가는 길목에서의 압축천연가스에 수소를 첨가한 수소-압축천연가스(HCNG)는 자동차 연료로서의 뛰어난 효과로 인해 미국, 캐나다, 유럽 등에서는 강화되고 있는 자동차의 배출가스 규제에 대해 만족할 수 있는 차세대 천연가스 자동차의 대안으로서 관련 기술개발과 실증사업에 주력하고 있다. 향후 수소시대의 도래에 즈음하여 HCNG의 사용은 수소사용에 대한 인식 향상과 아울러 수소사용을 안정적으로 공급할 수 있는 토대를 마련하고 수소제조 등 여러 분야에서 기술개발을 할 수 있는 부가적인 효과가 있다고 하겠다. 따라서 최근 국내에서 시내버스와 청소차등에서 천연가스 차량의 보급이 확대되고 있고, 충전소도 점차 확대되고 있는 상황에서 HCNG 연료의 적용가능성을 확인하기 위한 연구가 진행되고 있다. 본 논문에서는 선진국과 국내의 기술개발 현황을 소개하고 향후 우리에게 필요한 과제가 무엇인지를 생각해보는 기회를 갖고자 하였다.

시각장애인을 위한 IoT 접목의 음성인식을 이용한 딥 러닝 웨어러블 디바이스

이정옥(Jeongok Lee),김경수(KyoungSoo Kim),민병인(Byungin Min),김동섭(Dongseob Kim),박민성(Minseong Park),황규하(Gyuha Hwang),김용태(YongTae Kim),남지승(Jiseung Nam) 한국정보기술학회 2023 한국정보기술학회논문지 Vol.21 No.4

천연가스 차량에서의 CNG 대비 LNG의 이점

이중성(Joongseong Lee),한정옥(Jeongok Han),이영철(Youngchul Lee),채정민(Jeongmin Chae),홍성호(Seongho Hong) 한국가스학회 2009 한국가스학회 학술대회논문집 Vol.2009 No.10