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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>
간암 환자에서 간절제술 시행 후 초기 회복기간 중 이용할 수 있는 적합한 영양상태 평가 지표
김상화(Sang Hwa Kim),임진홍(Jin Hong Lim),김성훈(Sung Hoon Kim),이수지(Su Ji Lee),이호선(Ho Sun Lee),이재길(Jae Gill Lee),김충배(Choong Bae Kim),김경식(KyungSik Kim) 대한종양외과학회 2012 Korean Journal of Clinical Oncology Vol.8 No.2
목적 : 간절제술 후에는 간의 합성능력이 저하되고, 복수나 부종이 발생하게 된다. 본 연구에서는 이러한 상황에서 영양상태를 평가할 수 있는 적절한 지표를 검증하고자 하였다. 대상 및 방법 : 간세포암을 진단받고, 간절제술을 시행받은 65명의 환자를 대상으로 후향적으로 의무 기록을 분석하였다. 간절제 전 및 간절제 후 7일째 체중과 신체 체질량 지수, 혈액검사를 통해 영양 평가 지표를 측정하였다. 결과 : 65명의 환자중 남자는 52명, 여자는 13명으로 남녀 비는 4:1이었으며, 평균 연령은 56.2세였다. 수술 전 신체 체질량 지수는 저체중인 18.5 kg/m2 미만이 2명 (3.1%), 18.5-23kg/m2의 정상 범위가 22명(33.8%), 23-27.5 kg/m2의 과체중 상태가 19명(29.2%), 그리고 신체 체질량 지수 27.5 kg/m2 이상의 비만 상태가 22명(33.8%)였다. 수술 전 후의 영양 평가 항목의 변화를 살펴보면, 수술 후 림프구 수, 총 단백질량, 알부민, 혈액 요소 질소(BUN), 콜레스테롤, 프리알부민 수치가 유의하게 감소하였으며, 반면에 백혈구 세포수(5642±1831 vs. 7149±3069)와 CRP(2.98±4.78 vs. 25.69±22.23)는 눈에 띄게 증가하는 소견을 보였다(p=0.00, p=0.00). 수술 전과 후의 신체 체질량 지수와 체중은 통계학적으로 의미있는 변화는 보이지 않았다(p=1.91, p=8.23). 결론 : 간절제술 시행 후 영양 상태를 정확하게 평가하기 위해서, 염증 반응과 외부의 개입에 의한 영향 등을 고려하여, 쉽게 적용 할 수 있는 단일 영양 상태 평가 지표로는 프리알부민이 가장 적합할 것으로 사료된다. After hepatic resection, a synthetic liver function is often deteriorated, and ascites have been occasionally developed. Because of these limitations, this study is designed to validate the optimal nutritional index. We retrospectively reviewed medical records of sixty-five patients who underwent hepatectomy for hepatocellular carcinoma. Body weight, Body Mass Index (BMI) and laboratory parameters were compared at preoperative day and postoperative day 7. Patients consist of fifty-two males and thirteen females and average age is 56.2±9.9 years old. Forty-four patients had resected more than three segments, and twelve had resected 2 segments and nine had resected only one segment or received a wedge resection. According to preoperative BMI, there were two underweight (BMI < 18.5), twenty-two normal, nineteen overweight, and twenty-two obese (BMI>=27.5). After the surgery, lymphocyte count, total protein, albumin, BUN, Cholesterol, Prealbumin statistically significantly increased (p=0.00 & p=0.00). However, BMI and change in Body weight do not show statistically significant data (p=1.91, p=8.23). The degree of inflammation may have a significant influence in nutrition evaluation scale. Therefore, a new method of nutritional evaluation that can adjust degree of inflammation is needed to accurately evaluate the nutrition scale after hepatectomy.
Some coniferous fossil woods from the Cretaceous of Korea
Kyungsik Kim,Eun Kyoung Jeong,Mitsuo Suzuki,Min Huh,In Sung Paik 한국지질과학협의회 2002 Geosciences Journal Vol.6 No.2
Thirteen silicified fossil woods were collected fromthe Cretaceous deposits of Haenam Basin and islands of Gwanmaeand Byeongpung, Jeollanam-do as well as from the CretaceousDadaepo Formation, Busan, Korea. Anatomical features of all ofthese specimens showed that they were coniferous woods. On thebasis of the detailed anatomical features they were identified asDadoxylon byeongpungense sp. nov., Cupressinoxylon uhangriensesp. nov., Taxodioxylon cf. nihongii Nishida et H. Nishida, Taxodiox-ylon albertense (Penhallow) Shimakura, and Mesembrioxylon sp.All of them, except Mesembrioxylon, are described for the firsttime from the Korean Peninsula. It should be noted that no dicot-yledonous wood has been found from this study. Generally thesampled horizons are considered as Upper Cretaceous with dino-saur footprint fossils. In Japan, the Upper Cretaceous sedimentsbear abundant dicotyledonous fossils. Therefore further studiesshould be needed to clarify the age of these horizons and the veg-etation in the ancient world with dinosaur.
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.
Social Network Analysis of Research Keywords on the Leisure Industry in Korea
( Kyungsik Kim ),( Seungback Han ),( Yeonju Lee ),( Seungjin Han ),( Taehee Kang ) 아시아스포츠융합과학회 2020 Asia Pacific Journal of Applied Sport Sciences Vol.1 No.2
PURPOSE The purpose of this study was: (1) Firstly, do the keywords of the leisure industry research change by period? and (2) Secondly, what keywords symbolize the leisure industry research and how is the detailed research area organized? METHOD This study is conducted to search journal articles on Korea Citation Index(KCI) site to identify research trends related to leisure industry. To achieve this goal, we performed semantic network analysis on 1,069 papers of 328 Korean journals related the studies on leisure industry, which were published between 2002 and 2019. The Netminer was employed to conduct the semantic network analysis. RESULT Firstly, keywords such as sports, tourism, satisfaction, service, water, resource, and policy appeared to be important in the 2000s, while in the 2010s, keywords such as sports, tourism, brand, design, satisfaction, service, and market appeared to be important in the study of the leisure industry by period. Secondly, the co-occurrence word pairs appeared in the order of leisure-sport, leisure-marine, activity-leisure, industry-sport, quality-service, leisure-tourism, design-marine, and sport-tourism. Keywords with high centrality that appeared to be important included sports, tourism, brand, service, design, satisfaction, and culture. The areas of detailed research were found to be seven areas: sports and tourism, leisure and space, service and education, customer and satisfaction, marine and experience, industry and culture, and brand and design. CONCLUSION The semantic network was very useful for elucidating the academic characteristics by visualizing the research trend in the leisure industry in Korea.
‘Paldokangsan 3’ : a Walking Game for the Elderly Towards Good Memorization
KyungSik Kim,Yoonjung Lee,SeongSuk Oh 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.1
Old people are prone to get weak in their physical bodies as well as their memorizations. We have developed a serious game for the elderly named ‘Paldokangsan 3’ which is a walking game strengthening the ability of memorization with the interface of motion capture using Kinect. The experiments were done with 25 old people of more than 65 years old in ‘Cheonan’ city in Korea. Its effect analysis has showed possibilities of the improvement of memorization as well as improvement of concentration and vitality through this game. Also the French version of ‘Paldokangsan 3’ has been tested for 20 old people of more than 65 years old in France. There was no cultural conflict in France even though the street and characters were Korean with sounds in Korean.