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Seongwon Park,Kwangsu Cho,Bong Gyou Lee 보안공학연구지원센터 2014 International Journal of Multimedia and Ubiquitous Vol.9 No.11
Users of smartphone-based Instant Messenger such as Whatsapp, wechet, LINE and KAKAO TALK are rapidly increasing. LINE acquired more than 50 million members by December 2012 just 1 year after its release, and as of April 2014, the number of LINE mobile instant messenger users was 400 million Users. Given the rarity of research on the use of instant messengers in smartphones, this study analyzed factors affecting user satisfaction by conducting a survey on 220 users of mobile instant messengers in smartphones. The survey results showed that self-disclosure, flow, and social presence significantly affected user satisfaction. This study will benefit researchers and contribute to industries that possess interest in factors affecting user satisfaction regarding the use of smartphone applications and mobile messengers.
Ock, Kwangsu,Jeon, Won Il,Ganbold, ErdeneOchir,Kim, Mira,Park, Jinho,Seo, Ji Hye,Cho, Keunchang,Joo, Sang-Woo,Lee, So Yeong American ChemicalSociety 2012 ANALYTICAL CHEMISTRY - Vol.84 No.5
<P>We investigated <I>in vitro</I> and <I>in vivo</I> glutathione (GSH)-induced intracellular thiopurineanticancer drugrelease on gold nanoparticle (Au NP) surfaces by means of label-freeconfocal Raman spectroscopy. Direct monitoring of GSH-triggered releaseof 6-mercaptopurine (6MP) and 6-thioguanine (6TG) was achieved inreal time. Live cell imaging technique provides a nanomolar rangerelease of 6MP and 6TG from Au NP surfaces after the injection ofexternal GSH. <I>In vivo</I> SERS spectra of 6TG were obtainedfrom the subcutaneous sites in living mice after GSH treatment. GSH-triggeredreleases of Cy5-dye assembled on 6TG-capped Au NPs were also comparedusing independent fluorescence measurements. Our work demonstratesthat the time-lapse Raman spectroscopic tools are useful for monitoringof the controlled release of thiopurine drug molecules <I>invitro</I> and <I>in vivo</I>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancham/2012/ancham.2012.84.issue-5/ac2024188/production/images/medium/ac-2011-024188_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ac2024188'>ACS Electronic Supporting Info</A></P>