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AHP를 활용한 개인 클라우드 스토리지 선택 요인에 관한 연구
이재광(Jae Kwang Lee),조혜경(Hye-Gyeong Cho),김영희(Young-Hee Kim),김하얀(Ha-Yaan Kim),전현정(Huen-Jung,Jun) 한국IT서비스학회 2014 한국IT서비스학회 학술대회 논문집 Vol.2014 No.추계
본 연구는 개인 클라우드 스토리지의 선택에 미치는 요인들을 선행연구를 통해 도출하고 각 요인들이 클라우드 선택에 얼마나 영향을 끼치는지에 대해 AHP를 통한 중요도를 분석하였다. 연구모형은 시스템 요인, 서비스 요인, 사용자 요인 3가지 상위요인과 12가지의 하위요인으로 구성하였으며, 6개의 대안을 대상으로 평가하였다. 연구 결과 상위 요인에서는 시스템 요인이 상대적으로 중요하게 고려되어지는 것으로 나타났다. 이는 클라우드 사용자들이 시스템적인 요인을 가장 중요시함과 동시에 제공자들은 기능적인 부분의 품질을 높여야 함을 시사한다. 또한 하위요인에서 목적 부합성, 보안성, 접근성이 상위 3개 요인으로 나타났다. 중요도 가중치를 고려한 대안 평가의 경우 n drive가 1위였으며 daum cloud와 T cloud가 그 뒤를 이었다. 또한 응답자를 성별, 연령별, 현재 사용하고 있는 클라우드, 향후 사용하고자 하는 클라우드로 총 4가지의 그룹으로 나누어 ANOVA 분석을 실시하였다. 성별에서는 속도, 편리한 UI, 비용이 연령별에서는 속도, 브랜드 친숙도, 비용이 유의하게 나타났으며 사용하고 있는 클라우드별 그룹은 속도, 공유편리성이 향후 사용의향 클라우드별 그룹에는 목적 부합성이 유의한 수준을 보이는 것으로 나타났다. 본 연구결과는 개인의 클라우드 선택 결정 및 클라우드 서비스 제공자의 서비스 전략에 활용될 수 있을 것이다.
Intercalation of Gas Molecules in Graphene Oxide Interlayer: The Role of Water
Kim, Daeok,Kim, Dae Woo,Lim, Hyung-Kyu,Jeon, Jiwon,Kim, Hyungjun,Jung, Hee-Tae,Lee, Huen American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.20
<P>Intercalation phenomena of gas molecules in the interlayer of graphene oxide have been investigated using CO<SUB>2</SUB>, CH<SUB>4</SUB>, H<SUB>2</SUB>, and N<SUB>2</SUB> gases. Intercalation of gas molecules is highly affected by the affinity between the hydrophilic surface of GO and target molecules. Among tested gases, CO<SUB>2</SUB> can only be intercalated. Furthermore, the swelling of interlayer changed the intercalation phenomena. Amounts of intercalated gases are significantly enhanced, and all the gases can be intercalated by retarded dynamics of intercalated water.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-20/jp5026762/production/images/medium/jp-2014-026762_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5026762'>ACS Electronic Supporting Info</A></P>
Kim, Daeok,Kim, Dae Woo,Lim, Hyung-Kyu,Jeon, Jiwon,Kim, Hyungjun,Jung, Hee-Tae,Lee, Huen The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.41
<P>Porous materials have provided us unprecedented opportunities to develop emerging technologies such as molecular storage systems and separation mechanisms. Pores have also been used as supports to contain gas hydrates for the application in gas treatments. Necessarily, an exact understanding of the properties of gas hydrates in confining pores is important. Here, we investigated the formation of CO<SUB>2</SUB>, CH<SUB>4</SUB> and N<SUB>2</SUB> hydrates in non-interlamellar voids in graphene oxide (GO), and their thermodynamic behaviors. For that, low temperature XRD and <I>P</I>–<I>T</I> traces were conducted to analyze the water structure and confirm hydrate formation, respectively, in GO after its exposure to gaseous molecules. Confinement and strong interaction of water with the hydrophilic surface of graphene oxide reduce water activity, which leads to the inhibited phase behavior of gas hydrates.</P> <P>Graphic Abstract</P><P>Structural changes of water confined in graphene oxide to gas hydrates were investigated using low temperature XRD. It was revealed that the phase equilibrium points of gas hydrates strongly inhibited due to the surrounding nano-sized voids and the hydrophilic surface of graphene oxide. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp03263b'> </P>
임양빈(Yang-Bin Ihm),김경선(Kyoung-Sun Kim),경기성(Kee-Sung Kyung),김남숙(Nam-Suk Kim),하헌영(Huen-Young Ha),이희동(Hee-Dong Lee),오경석(Kyeong-Seok Oh),김정원(Jung-Won Kim),류갑희(Gab-Hee Ryu) 한국농약과학회 2003 농약과학회지 Vol.7 No.4
In order to get the actual pesticide usage data for fruit crops at fanner's gate, this survey was carried out on the growers of 6 representative fruit crops such as apple, citrus, grape, peach, pear and persimmon, in Korea. One hundred fifty farmers were selected in main production areas to record their pesticide usage during the growing seasons. Pesticides were sprayed in pear 15.2 times/year and persimmon 7 times/year. Pesticide input amount per unit for fruits was 39.5 for citrus, 22.1 for apple, 21.5 for pear, 11.9 for peach, 10.8 for persimmon and 6.7 a.i. ㎏/㏊ for grape, respectively. The amounts of pesticides sprayed in 2002 except for peach and pear tend to decrease compared with those in 1999. The major fungicides used were mancozeb, propineb, dithianon, etc., while the major insecticides were fenitrothion, chlorpyrifos, methidathion, etc. Total active ingredients of pesticides used for six fruit crops amounted to 18.3% of total sales amount of pesticides for horticulture in 2002. The amounts of pesticides sprayed on citrus, grape, peach and pear in Korea was less than those in U.S.A., excepting those in apple.