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의사결정나무 Random Forest를 이용한 스마트워치 이용자의 만족도와 추천의도에 대한 영향요인 분석
박경원 ( Park¸ Kyoungwon ),조성빈 ( Cho¸ Sungbin ) 한국경영공학회 2021 한국경영공학회지 Vol.26 No.3
Purpose This study analyzes influencing factors on smart phone user's perceived satisfaction, continuous use intention, and recommendation intention. Methods The influencing factors include usefulness, convenience, appearance, enjoyment, innovation, security, and privacy, whereas response is measured through satisfaction, continuous use intention, and recommendation intention. Two methods are employed - decision tree using GINI index and random forest approach. Results The analysis results revealed that most significant factors for user’s satisfaction and continuous use intention are usefulness in daily life and that usefulness in daily life and fashion are influential to recommendation intention. According to the Random Forest Model, the importance of usefulness in daily life and efficient handling of tasks were crucial for satisfaction level, the importance of rapid access to information for continuous use intention, and a combination of fashion for recommendation intention. Conclusion The findings of this study are consistent with existing literature in the sense that the usefulness is important. We additionally suggest that fast information accessibility and fashion should be recognized as important factors in smart watch industry.
Comparative analysis of seed transcriptomes of ambient ozone-fumigated 2 different rice cultivars
Cho, Kyoungwon,Shibato, Junko,Kubo, Akihiro,Kohno, Yoshihisa,Satoh, Kouji,Kikuchi, Shoshi,Sarkar, Abhijit,Agrawal, Ganesh Kumar,Rakwal, Randeep Informa UK (Taylor Francis) 2013 Plant signaling & behavior Vol.8 No.11
Kyoungwon Cho,최재하,이정일,류정호 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.1
We report a novel synthetic route for the synthesis of Tm3+/Yb3+ co-doped calcium molybdate (CaMoO4) nanoparticles by using pulsed laser ablation in ethanol. The crystalline phase, particle morphology, particle size distribution, laser ablation mechanism, and upconversion (UC) luminescent properties are investigated. Stable colloidal suspensions consisting of well-dispersed Tm3+/Yb3+ co-doped CaMoO4 nanoparticles with a narrow size distribution could be obtained without any surfactant. Under 980-nm excitation, a Tm3+/Yb3+ co-doped nanocolloidal CaMoO4 suspension showed bright blue emission at a wavelength near 475 nm, which was generated by the 1G4 ! 3H6 transition, and a weak red emission at a wavelength near 650 nm due to the 3F2 ! 3H6 transition. The Tm3+/Yb3+ co-doped nanocrystalline CaMoO4 suspension exhibited a strong blue emission visible to the naked eyes, and a possible UC mechanism that depends on the pump-power dependence is discussed in detail.
Cho, Kyoungwon,Shibato, Junko,Kubo, Akihiro,Kohno, Yoshihisa,Satoh, Kouji,Kikuchi, Shoshi,Agrawal, Ganesh Kumar,Sarkar, Abhijit,Rakwal, Randeep Kluwer Academic Publishers 2013 Biotechnology letters. Vol.35 No.4
<P>The 'ozone (O3)-responsive transcriptome' behavior in the panicles and grains of rice plant was studied individually through high-throughput oligo-DNA microarray technique. O3 differentially and separately regulated 620 and 130 genes in the panicles and grains. Among the O3-responsive genes, 176 and 444 genes were up- and down-regulated in panicle compared to 24 and 106 genes in grain, respectively. Further mapping revealed that the majority of differentially expressed genes were mainly involved in signaling, hormonal, cell wall, transcription, proteolysis, and defense events. Many previously unknown O3-responsive novel genes were identified. Inventory of 745 O3-responsive genes and their mapping will expand our knowledge on novel regulatory processes in both panicles and grains of rice; and, serve as a resource towards the designing of rice crops for future high-O3world.</P>
Cho, Kyoungwon,Kim, Yuran,Wi, Soo jin,Seo, Jong Bok,Kwon, Joseph,Chung, Joo Hee,Park, Ky Young,Nam, Myung Hee American Chemical Society 2013 Journal of agricultural and food chemistry Vol.61 No.35
<P>Reactive oxygen species (ROS) and ethylene play an important role in determining the resistance or susceptibility of plants to pathogen attack. A previous study of the response of tobacco cultivar (Nicotiana tabacum L. cv. Wisconsin 38) to a compatible hemibiotroph, Phytophthora parasitica var. <I>nicotianae</I> (<I>Ppn</I>) showed that biphasic bursts of ROS and ethylene are positively associated with disease severity. The levels of ethylene and ROS might influence the susceptibility of plants to pathogens, with changing levels of metabolite related to disease resistance or susceptibility. In this study, to obtain more detailed information on the interaction of ROS and ethylene signaling related to resistance and/or susceptibility of plants to pathogen, <I>Ppn</I>-induced metabolic profiles from wild type (WT) and ethylene signaling-impaired transgenic plants that expressed <I>Ein3</I> antisense (<I>Ein3-AS</I>) were compared using ultraperformance liquid chromatography–quadrupole time-of-flight mass spectrometry (UPLC-QTOF-MS). Nonredundant mass ions (576 in ESI+ mode and 336 in ESI– mode) were selected, and 56 mass ions were identified on the basis of their accurate mass ions and MS/MS spectra. Two-way hierarchical clustering analysis of the selected mass ions revealed that nicotine and phenylpropanoid–polyamine conjugates, such as caffeoyl-dihydrocaffeoyl–spermidine, dicaffeoyl–spermidine, caffeoyl-feruloyl–spermidine, and two bis(dihydrocaffeoyl)–spermine isomers, and their intermediates, such as arginine and putrecine, were present at lower levels in <I>Ein3-AS</I> transgenic plants during <I>Ppn</I> interaction than in WT, whereas galactolipid and oxidized free fatty acid levels were higher in <I>Ein3-AS</I> transgenic plants. Taken together, these results reveal a function for ethylene signaling in tobacco defense responses during <I>Ppn</I> interaction.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2013/jafcau.2013.61.issue-35/jf401785w/production/images/medium/jf-2013-01785w_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jf401785w'>ACS Electronic Supporting Info</A></P>
Cho, Kyoungwon,Kim, Yuran,Wi, Soo Jin,Seo, Jong Bok,Kwon, Joseph,Chung, Joo Hee,Park, Ky Young,Nam, Myung Hee American Chemical Society 2012 Journal of agricultural and food chemistry Vol.60 No.44
<P>A biphasic reactive oxygen species (ROS) production has previously been observed in tobacco at 1 and 48 h after inoculation with the hemibiotrophic compatible pathogen, Phytophthora parasitica var. <I>nicotianae</I> (<I>Ppn</I>). To characterize the response of tobacco to biphasically produced ROS concerning the propagation of <I>Ppn</I>, ultraperformance liquid chromatography–quadrupole–time of flight/ mass spectrometry (UPLC-Q-TOF/MS) based metabolic profiling combined with multivariate statistical analysis was performed. Among the nonredundant 355 mass ions in ESI+ mode and 345 mass ions in ESI– mode that were selected as significantly changed by <I>Ppn</I> inoculation (|<I>p</I>(corr)| > 0.6 on S-plot of orthogonal partial least-squares discriminant analysis (OPLS-DA), fold-change > 2, and <I>p</I> < 0.05 in the independent two-sample <I>t</I> test), 76 mass ions were identified on the basis of their accurate mass ions and MS/MS spectra. Phenolic amino acids, phenylpropanoids, hydroxycinnamic acid amides, linoleic acid, linolenic acid, lysophospholipids, glycoglycerolipids, and trioxidized phospholipids were identified as having changed after <I>Ppn</I> inoculation. On the basis of their quantitative changes, the metabolic responses occurring at each phase of ROS production after <I>Ppn</I> inoculation were investigated in this study.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2012/jafcau.2012.60.issue-44/jf303702j/production/images/medium/jf-2012-03702j_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jf303702j'>ACS Electronic Supporting Info</A></P>
Cho, Suckju,Jung, Kyoungwon,Yeom, Seokran,Park, Sungwook,Kim, Hyunghoi,Hwang, Seongyoun The Korean Surgical Society 2012 Annals of Surgical Treatment and Research Vol.82 No.1
<P><B>Purpose</B></P><P>The Ministry of Health and Welfare recently designated 35 major trauma-specified centers (MTSC). The purpose of this study is to determine changes in patient flow and designated hospitals, and to describe the role of the emergency medical information center (EMIC) in a regional trauma care system.</P><P><B>Methods</B></P><P>Data of trauma patient inter-facility transfer arrangement by one EMIC were reviewed for 2 months before and after the designation of MTSC. The data included success or failure rates of the arrangement, time used for arrangement, and inquiring and accepting facility.</P><P><B>Results</B></P><P>At pre- and post-designation study period, there were 540 and 433 trauma patient inter-facility transfers arranged by EMIC, respectively. The median time used for arrangement decreased from 9.3 to 7.7 minutes (P = 0.007). Arrangement failure rate was 3.5% and 2.5%, respectively, with no significant interval change (P = 0.377). The percentage of inquiring MTSC decreased from 49.1 to 36.9% (P < 0.001). The percentage of accepting MTSC increased from 20.2 to 37.4% (P < 0.001).</P><P><B>Conclusion</B></P><P>With the designation of MTSC, EMIC could arrange inter-facility transfers more quickly. The hospitals wanted more trauma patients after the designation. There would be a concentration of trauma patients to MTSCs in our region. Further studies are needed for scientific evidence on patient outcome.</P>
Suckju Cho,Kyoungwon Jung,Seokran Yeom,Sungwook Park,Hyunghoi Kim,Seongyoun Hwang 대한외과학회 2012 Annals of Surgical Treatment and Research(ASRT) Vol.82 No.1
Purpose: The Ministry of Health and Welfare recently designated 35 major trauma-specified centers (MTSC). The purpose of this study is to determine changes in patient flow and designated hospitals, and to describe the role of the emergency medical information center (EMIC) in a regional trauma care system. Methods: Data of trauma patient inter-facility transfer arrangement by one EMIC were reviewed for 2 months before and after the designation of MTSC. The data included success or failure rates of the arrangement, time used for arrangement, and inquiring and accepting facility. Results: At pre- and post-designation study period, there were 540 and 433 trauma patient inter-facility transfers arranged by EMIC, respectively. The median time used for arrangement decreased from 9.3 to 7.7 minutes (P = 0.007). Arrangement failure rate was 3.5% and 2.5%, respectively, with no significant interval change (P = 0.377). The percentage of inquiring MTSC decreased from 49.1 to 36.9% (P < 0.001). The percentage of accepting MTSC increased from 20.2 to 37.4% (P < 0.001). Conclusion: With the designation of MTSC, EMIC could arrange inter-facility transfers more quickly. The hospitals wanted more trauma patients after the designation. There would be a concentration of trauma patients to MTSCs in our region. Further studies are needed for scientific evidence on patient outcome.