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Understanding smartphone usage in college classrooms: A long-term measurement study
Kim, Inyeop,Kim, Rihun,Kim, Heepyung,Kim, Duyeon,Han, Kyungsik,Lee, Paul H.,Mark, Gloria,Lee, Uichin Pergamon Press 2019 Computers & education Vol. No.
<P><B>Abstract</B></P> <P>Smartphone usage is widespread in college classrooms, but there is a lack of measurement studies. We conducted a 14-week measurement study in the wild with 84 first-year college students in Korea. We developed a data collection and processing tool for usage logging, mobility tracking, class evaluation, and class attendance detection. Using this dataset, we quantify students' smartphone usage patterns in the classrooms, ranging from simple use duration and frequency to temporal rhythms and interaction patterns. Furthermore, we identify the key predictors of students’ in-class smartphone use and their semester grades. Our results reveal that students use their phones for more than 25% of effective class duration, and phone distractions occur every 3–4 min for over a minute in duration. The key predictors of in-class smartphone use are daily usage habits and class characteristics, and in-class phone usage is negatively correlated with student grades.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Students used their phones for more than 20 min per class, which is over 25% of the effective class duration. </LI> <LI> Phone usage was prevalent throughout the class, and phone distractions happened in every 3–4 min for over a minute. </LI> <LI> Considerable underestimation of in-class phone usage was found: self-report: 8.25 vs. measurement: 12.28 </LI> <LI> Predictors of in-class usage were daily usage behaviors, class size, and lecture organization. </LI> <LI> Phone usage patterns such as daily and in-class use habits had a negative relationship with student grades. </LI> </UL> </P>
Expression of human peroxiredoxin isoforms in response to cervical carcinogenesis
Kim, Kiyoon,Yu, Miran,Han, Seulhee,Oh, Inkyung,Choi, Young-Jun,Kim, Sungsoo,Yoon, Kyungsik,Jung, Minhyung,Choe, Wonchae Spandidos Publications 2009 ONCOLOGY REPORTS Vol.21 No.6
<P>Despite considerable progress in understanding the function of peroxiredoxin (Prx) in cancer, its expression patterns have not been extensively studied in response to cervical carcinogenesis. We evaluated the expression of Prx isoforms in normal tissue, cervical intraepithelial neoplasia (CIN1, CIN2, and CIN3), and cervical cancer. We found strong pattern of increased Prx II and III immunostaining with increasing severity of the lesion. No difference in staining intensity by grade of lesion was observed for Prx I, and IV. Therefore, we conclude that Prx II and III are upregulated in response to the development of cervical cancer.</P>
Social and Policy Determinants of COVID-19 Infection Across 23 Countries: An Ecological Study
Kim, Kyungsik,Jeung, Young-Do,Choi, Jeoungbin,Park, Sue K. The Korean Society for Preventive Medicine 2022 예방의학회지 Vol.55 No.2
Objectives: This study aimed to identify the social and policy determinants of coronavirus disease 2019 (COVID-19) infection across 23 countries. Methods: COVID-19 indicators (incidence, mortality, and fatality) for each country were calculated by direct and indirect standardization. Multivariable regression analyses were used to identify the social and policy determinants of COVID-19 infection. Results: A higher number of doctors per population was related to lower incidence, mortality, and fatality rates of COVID-19 in 23 countries (β=-0.672, -0.445, and -0.564, respectively). The number of nurses/midwives per population was associated with lower mortality and fatality rates of COVID-19 in 23 countries (β=-0.215 and -0.372, respectively). Strengthening of policy restriction indicators, such as restrictions of public gatherings, was related to lower COVID-19 incidence (β=-0.423). A national Bacillus Calmette-Guérin vaccination policy conducted among special groups or in the past was associated with a higher incidence of COVID-19 in 23 countries (β=0.341). The proportion of the elderly population (aged over 70 years) was related to higher mortality and fatality rates (β=0.209 and 0.350, respectively), and income support was associated with mortality and fatality rates (β=-0.362 and -0.449, respectively). Conclusions: These findings do not imply causality because this was a country-based correlation study. However, COVID-19 transmission can be influenced by social and policy determinants such as integrated health systems and policy responses to COVID-19. Various social and policy determinants should be considered when planning responses to COVID-19.
Dynamical Mechanism in Korean Financial Market
Kyungsik Kim,J. S. Choi,Seong-Min Yoon,Yup Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.3
We study the herd behavior of returns on the Korean treasury bond (KTB203) in Korean futures exchange market. In our case, the probability distribution of returns for herding parameters scales as a power law R
Kim, Hee Soon,Park, Yong Myung,Kim, Byung Jun,Kim, Kyungsik Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.2
In this study, the bend-buckling strength of the web in longitudinally stiffened plate girder was numerically investigated. The buckling strength of the reinforced web was evaluated through an eigenvalue analysis of the hypothetical model, in which the top and bottom junctions of the web to the flanges were assumed as simple support conditions. Major parameters in the analysis include asymmetrical cross-sectional property, aspect ratio of the web, stiffener locations, and bending rigidity of the stiffeners. The numerical results showed that current AASHTO LRFD specifications (2014) provides the buckling strength from considerably safe side to slightly unsafe side depending on the location of the stiffeners. A modified equation for buckling coefficients was proposed to solve the shortcomings. The bending rigidity requirements of longitudinal stiffeners stipulated in AASHTO were also investigated. It is desirable to increase the rigidity of the stiffeners when the aspect ratio is less than 1.0.