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Degree of Brain Connectivity Predicts Eye-Tracking Variability
서민아,Rachel A. Kolster,Sumit Niogi,Bruce D. McCandliss,Richard B. Ivry,Henning U. Voss,Ranjeeta Sarkar,Jamshid Ghajar 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
Mild traumatic brain injury (mTBI) is commonly associated with diffse axonal injury (DAI), as well as performance variability and attention and working memory deficits. A visual tracking task with concurrent working memory loading may induce differential effects on performance variability among mTBI patients with varying degrees of DAI and therefore different degrees of brain connectivity. Using a multi-linear regression technique, we examined correlations between white matter integrity as detected by magnetic resonance diffusion tensor imaging and eye tracking variability under a working memory load in mTBI patients. The impact of increased working memory load on tracking variability was correlated with the degree of white matter integrity. Our results suggest that eye tracking variability under working memory loading may be used to assess the degree of DAI in mTBI patients.
서민아,최귀선,이윤영,전재관 대한암학회 2013 Cancer Research and Treatment Vol.45 No.2
Purpose The Korean National Cancer Screening Survey (KNCSS), a nationwide, annual crosssectional survey, has been conducted since 2004. The current study was conducted in order to report on trends in cancer screening rates for five types of cancer (stomach,liver, colorectal, breast, and cervix uteri). Materials and Methods KNCSS data were collected between 2004 and 2012. The eligible study population included cancer-free men who were 40 years of age and older and women who were 30 years of age and older. The lifetime screening rate, screening rate with recommendation,and changes in annual rates were calculated. Results Lifetime screening rates and screening rates with recommendation for the five types of cancer rose steadily until 2010, showed a slight drop or were stable in 2011, and increased again in 2012. On average, screening rates with recommendation have shown annual increases of 4.3% (95% confidence interval [CI], 3.6 to 5.0%) for stomach cancer, 0.8% (95% CI, –0.5 to 2.1%) for liver cancer, 2.4% (95% CI, 1.3 to 3.5%)for colorectal cancer, 4.5% (95% CI, 3.9 to 5.1%) for breast cancer, and 1.3% (95%CI, 0.6 to 2.0%) for cervical cancer. Disparities in age groups and household incomes have been decreasing since 2004. Conclusion Cancer screening rates in Korea showed a significant increase from 2004 to 2012,and screening rates for gastric and breast cancer are now approaching 70%. The 10-Year Plan for Cancer Control target for screening rates was met or nearly met for all cancer types examined, with the exception of liver and colorectal cancer.
서민아,김호현,손명현,김규언,김창수,신동천 대한의학회 2011 Journal of Korean medical science Vol.26 No.3
The purpose of this study was to investigate the nationwide prevalence of childhood asthma, eczema and other allergic diseases in Korean school-age children (8-11 yr old) and to assess the difference between residential areas. Among 6,279 elementary schools, 427schools were randomly selected according to residential area (metropolitan, provincial,rural, and industrial area) by the cluster sampling method. Parents of students completed a modified Korean version of a questionnaire formulated by the International Study of Asthma and Allergies in Childhood (ISAAC). Among 50,200 subjects, 31,026 (61.8%)responded, and 30,893 (99.6%) were analyzed. The 12-month prevalence of wheeze,flexural rash, and allergic rhinitis symptoms were 4.8%, 15.3%, and 32.9%, respectively. The prevalence of diagnosis of allergic diseases in boys was higher than that in girls, with the exception of eczema. In both boys and girls, the difference of the prevalence of allergic diseases among industrial, metropolitan and provincial areas was not statistically significant, but the differences between rural area and other areas were significant. Our results support the importance of contextual effect associated with residential area as causative agents of allergic diseases among Korean school-age children.
Association Between Body Mass Index and Asthma Symptoms Among Korean Children: A Nation-Wide Study
서민아,김호현,최동필,김경원,손명현,하경화,황원주,김창수,김규언,신동천,박수경,강대희 대한의학회 2011 Journal of Korean medical science Vol.26 No.12
The purpose of this study was to investigate the association between body mass index (BMI)and the prevalence of wheeze using nation-wide cross-sectional study in Korean children. Total 50,200 children from 427 elementary schools were randomly selected according to residential areas (metropolitan, provincial, rural, and industrial areas) by the cluster sampling method. The International Study of Asthma and Allergies in Childhood (ISAAC)questionnaires were used to measure the prevalence of wheeze. Among 31,026respondents, 25,322 were analyzed. BMI was classified into quartiles based on BMI-forage percentile. In all residential areas, pets at home and visible mold or moisture were associated with an increased prevalence of wheeze in both genders. However, other living environment factors were not consistently associated among residential areas and gender. Among girls, lowest BMI was negatively associated with prevalence of wheeze and highest BMI was positively associated in all residential areas. In multilevel logistic regression analysis, environmental tobacco smoking exposure, pets at home, visible mold or moisture, and being in the lowest and highest BMI quartile were significantly associated with the prevalence of wheeze in both genders. BMI has become an important risk factor for asthma symptoms among Korean children.
Focusing of Terahertz Waves onto Micron-sized Slits Grown on ZnTe and GaP Substrates
서민아,H. R. Park,박두재,A. J. L. Adam,P. C. M. Planken,김대식 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
We report on terahertz focusing through rectangular slit apertures on thin metal film by using terahertz time domain spectroscopy both in the far- and in the near-field. Our experiments show that far-field perfect transmission is maintained in the rectangular slit array even as the aperture coverage decreases. Near-field imaging supports the field enhancement in the single rectangular aperture indeed occurring at a frequency equal to the fundamental shape resonance frequency.