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신체활동과 스마트폰 사용 및 학업 문제 경험 간의 관계
유예원(Yu, Ye-Won),송윤경(Song, Yoon-kyung),유미성(Yu, Mi-Seong),전용관(Justin, Y. Jeon) 한국체육교육학회 2018 한국체육교육학회지 Vol.23 No.2
본 연구에서는 신체활동이 우리나라 청소년들에게 스마트폰으로 인한 학업 수행의 문제 경험과 어떤 상관성이 있는지 살펴보는데 목적이 있다. 본 연구에서는 2017년 ‘제13차 청소년건강행태온라인조사’(KYRBS)가 분석에 이용되었으며, 2017년 청소년건강행태온라인조사 대상자 62,276명 중, 만 15세에서 18세까지의 고등학교에 재학 중인 청소년 31,391명의 자료를 최종 분석에 사용하였다. 수집된 자료는 IBM SPSS statistics version 23 프로그램을 이용하여 복합표본 분석방법을 사용하였다. 빈도분석과 다중 로지스틱 회기분석을 실시하여 조정된 오즈비(Adjusted Odds Ratio)와 95% 신뢰구간을 산출하였다. 모든 통계분석의 유의확률은 p<.05로 하였다. 연구 결과 어떤 신체활동이든 일주일에 한번이상 하는 남학생은 스마트폰으로 인한 학업문제를 격을 확률이 12%, 여학생은 23% 줄어들었다. 결론적으로, 신체활동에 참여할수록 또 활발히 신체활동을 할수록 스마트폰으로 인한 학업문제를 경감시키는 상관성을 확인하였다. 따라서, 스마트폰으로 인한 학업문제를 완화시키기 위하여 청소년들에게 신체활동참여를 독려할 필요성이 있다. Purpose: The purpose of this study is to examine the association between participation in physical activity (PA) and experience of academic problems due to smartphone use among Korean adolescents. Methods: The data from 31,391 Korean adolescent (ages 15-18) who participated in the 2017 KYRBS(Korea Youth Risk Behavior Web-based survey) was analyzed. Descriptive statistics were calculated, and gender-stratified logistic regressions analysis were conducted to generate odds ratios (OR) and 95% confidence intervals (CI). Results: Compared with boys who did not participate in any PA, boys who participated in PA more than once a week were less likely to experience academic problems due to smartphone use (OR=0.87, 95% CI:0.77-0.98). Compared with girls who did not participate in any PA, girls who participated in PA more than once a week were less likely to experience academic problems due to smartphone use (OR=0.76, 95% CI:0.70-0.82), respectively Conclusion: Participating in PA was inversely associated with academic problems due to the use smartphone. The importance of PA participation for academic problems due to the use of smartphone was confirmed in our study.
Sunlight-Induced Self-Healing of a Microcapsule-Type Protective Coating
Song, Young-Kyu,Jo, Ye-Hyun,Lim, Ye-Ji,Cho, Sung-Youl,Yu, Hwan-Chul,Ryu, Byung-Cheol,Lee, Sang-In,Chung, Chan-Moon American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.4
<P>Photopolymerization behavior of a methacryloxypropyl-terminated polydimethylsiloxane (MAT-PDMS) healing agent was investigated in the presence of benzoin isobutyl ether (BIE) photoinitiator by Fourier transform infrared (FT-IR) spectroscopy. MAT-PDMS and BIE were microencapsulated with urea-formaldehyde polymer. The surface and shell morphology of the microcapsules was investigated by scanning electron microscopy (SEM). Mean diameter and size distribution of the microcapsules could be controlled by agitation rate. A coating matrix formulation was prepared by sol–gel reaction of tetraethyl orthosilicate (TEOS) in the presence of a polysiloxane and by subsequent addition of an adhesion promoter. The formulation and microcapsules were mixed to give a self-healing coating formulation, which was then sprayed to surface of cellulose-fiber-reinforced-cement (CRC) board or mortar. Contact angle measurements showed that both the polymerized MAT-PDMS and the prepared coating matrix are hydrophobic, and the coating matrix has good wettability with MAT-PDMS. It was confirmed by optical microscopy and SEM that, when the self-healing coating is damaged, the healing agent is released from ruptured microcapsules and fills the damaged region. The self-healing coating was evaluated as protective coating for mortar, and it was demonstrated by water permeability and chloride ion penetration tests that our system has sunlight-induced self-healing capability. Our self-healing coating is the first example of capsule-type photoinduced self-healing system, and offers the advantages of catalyst-free, environmentally friendly, inexpensive, practical healing.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-4/am302728m/production/images/medium/am-2012-02728m_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am302728m'>ACS Electronic Supporting Info</A></P>
Yu, Shin-Hye,Kwak, So-Hyung,Nguyen, Thi Thanh Hanh,Seo, Ye-Seul,Song, Chaeri,Mok, Il Kyoon,Kim, Doman Springer Netherlands 2018 Biotechnology letters Vol.40 No.2
<P><B>Objectives</B></P><P>To develop preventive canine oral health bio-materials consisting of probiotics and glucanase to reduce insoluble glucan and volatile sulfur compound formation.</P><P><B>Results</B></P><P>Co-cultivation of <I>Enterococcus faecium</I> T7 with <I>Streptococcus mutans</I> at inoculation ratio of 3:1 (v/v) resulted in 25% reduction in the growth of <I>Streptococcus mutans</I>. Amounts of soluble and insoluble glucans produced by <I>S. mutans</I> were decreased to 70 and 55%, respectively. Insoluble glucan was decreased from 0.6 µg/ml in <I>S. mutans</I> culture to 0.03 µg/ml in <I>S. mutans</I> co-cultivated with <I>E. faecium</I> T7 in the presence of <I>Lipomyces starkeyi</I> glucanase. Volatile sulfur compound, a main component of halitosis produced by <I>Fusobacteria nucleatum</I>, was decreased by co-cultivating <I>F. nucleatum</I> with <I>E. faecium.</I></P><P><B>Conclusion</B></P><P><I>E. faecium</I> and glucanase can be combined as potentially active ingredients of oral care products for pets by reducing plaque-forming bacteria growth and their by-products that cause cavity and periodontal disease.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (10.1007/s10529-017-2478-z) contains supplementary material, which is available to authorized users.</P>
Structural Analysis of Cu Binding Site in [Cu(I)·d(CpG)·d(CpG)−2H]−1 Complex
Yu-Jin Im,Sang-Mi Jung,Ye-Song Kang,김호태 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.4
The Cu cation binding sites of [Cu(I)·d(CpG)·d(CpG) – 2H]−1 complex have been investigated to explain the [Cu·DNA] biological activity caused by the Cu association to DNA. The structure of [Cu(I)·d(CpG)·d(CpG) – 2H]−1 complex was investigated by electrospray ionization mass spectrometry (ESI-MS). The fragmentation patterns of [Cu(I)·d(CpG)·d(CpG) – 2H]−1 complex were analyzed by MS/MS spectra. In the MS/MS spectra of [Cu(I)·d(CpG)·d(CpG) – 2H]−1 complex, three fragment ions were observed with the loss of d(CpG), {d(CpG) + Cyt}, and {d(CpG) + Cyt + dR}. The Cu cation binds to d(CpG) mainly by substituting the H+ of phosphate group. Simultaneously, the Cu cation prefers to bind to a guanine base rather than a cytosine base. Five possible geometries were considered in the attempt to optimize the [Cu(I)·d(CpG)·d(CpG) – 2H]−1 complex structure. The ab initio calculations were performed at B3LYP/6-31G(d) level.
Design and Optimization of Micro Gas Sensor
Yu Guangbin,Guan Yanqi,Zhang Hongquan,Song Ye 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.8
The ordinary gas sensor has low material utilization, high power consumption, temperature distribution uneven and poor consistency problems. Based on film processing technology, this paper designs a new structure of micro gas sensor. Triangle type design is first adopted in the structure, with platinum as the electrode material, ceramics substrate. Using ANSYS Workbench to analysis different size electrode and substrate that including the temperature field, stress field and the optimization design for substrate and electrode, the sensor can be uniform temperature distribution, stress of small and the effective control of power consumption, it is beneficial to improve the overall performance of the sensor. In addition, the sensor is tested to verify the accuracy of the finite element simulation.
Case Report : Pandemic Influenza (H1N1) and Mycobacterium tuberculosis Co-infection
( Ye Hyun Park ),( Bum Sik Chin ),( Sang Hoon Han ),( Yu Jung Yun ),( Young Ju Kim ),( Jun Yong Choi ),( Chang Oh Kim ),( Young Goo Song ),( June Myung Kim ) 대한결핵 및 호흡기학회 2014 Tuberculosis and Respiratory Diseases Vol.76 No.2
We hereby observe four co-infection cases of pandemic influenza H1N1 and Mycobacterium tuberculosis with various clinical presentations. It may be prudent to consider M. tuberculosis co-infections when patients with pandemic influenza reveal unusual clinical features that do not improve despite appropriate treatments against the influenza, especially in Korea, in the endemic areas of M. tuberculosis.
Anti-Biofilm Activity of Grapefruit Seed Extract against Staphylococcus aureus and Escherichia coli
( Ye Ji Song ),( Hwan Hee Yu ),( Yeon Jin Kim ),( Na-kyoung Lee ),( Hyun-dong Paik ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.8
Grapefruit seed extract (GSE) is a safe and effective preservative that is used widely in the food industry. However, there are few studies addressing the anti-biofilm effect of GSE. In this study, the anti-biofilm effect of GSE was investigated against biofilm-forming strains of Staphylococcus aureus and Escherichia coli. The GSE minimum inhibitory concentration (MIC) for S. aureus and E. coli were 25 μg/ml and 250 μg/ml, respectively. To investigate biofilm inhibition and degradation effect, crystal violet assay and stainless steel were used. Biofilm formation rates of four strains (S. aureus 7, S. aureus 8, E. coli ATCC 25922, and E. coli O157:H4 FRIK 125) were 55.8%, 70.2%, 55.4%, and 20.6% at 1/2 × MIC of GSE, respectively. The degradation effect of GSE on biofilms attached to stainless steel coupons was observed (≥ 1 log CFU/coupon) after exposure to concentrations above the MIC for all strains and 1/2 × MIC for S. aureus 7. In addition, the specific mechanisms of this anti-biofilm effect were investigated by evaluating hydrophobicity, auto-aggregation, exopolysaccharide (EPS) production rate, and motility. Significant changes in EPS production rate and motility were observed in both S. aureus and E. coli in the presence of GSE, while changes in hydrophobicity were observed only in E. coli. No relationship was seen between auto-aggregation and biofilm formation. Therefore, our results suggest that GSE might be used as an anti-biofilm agent that is effective against S. aureus and E. coli.