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A Study on the Method of Calculating the Server Capacity for Cloud Computing
Kook-Hyun Choi,Yang-Ha Chun,Se-Jeong Park,Yongtae Shin,Jea-Won Park,Jong-Bae Kim 한국정보통신학회 2015 2016 INTERNATIONAL CONFERENCE Vol.7 No.1
Thanks to today"s computing environment, where it is like IT is cloud, and cloud is IT, the importance of calculating the system performance and capacity is gaining more and more weight. Especially, since cloud computing require a significant amount of server resources, it is the most important to calculate the capacity of the hard ware in a systematic and accurate manner. And, the technology is advancing rapidly to its maturity. Particularly, many IT companies of Korea entered into MOUs with companies which have already established their cloud infrastructure and provide SaaS. Therefore, the studies on calculation methods on hardware capacities for SaaS is the most essential part of the cloud service and forms the foundation for future expansions to various businesses within the cloud. For this reason, this study provides the methods and criteria for calculating the capacity of hardware based on SaaS. The results of this study may be used as guidelines for calculating the capacities for HW when establishing a cloud computing environment in the future.
Choi, Sung Min,Ahn, Junsung,Son, Ji-Won,Lee, Jong-Ho,Kim, Byung-Kook,Yoon, Kyung Joong,Ji, Ho-Il American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.46
<P>Degradation of oxygen electrode in reversible solid oxide cells operating in both electrolysis and fuel-cell modes is a critical issue that should be tackled. However, origins and mechanisms thereof have been diversely suggested mainly due to the difficulty in precise analysis of microstructural/compositional changes of porous electrode, which is a typical form in solid oxide cells. In this study, we investigate the degradation phenomena of oxygen electrode under electrolysis and fuel-cell long-term operations for 540 h, respectively, using a geometrically well-defined, nanoscale La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>Co<SUB>0.2</SUB>Fe<SUB>0.8</SUB>O<SUB>3−δ</SUB> (LSCF) dense film with a thickness of ∼70 nm. Based on assessments of electrochemical properties and analyses of microstructural and compositional changes after long-term operations, we suggest consolidated degradation mechanisms of oxygen electrode, including the phenomena of kinetic demixing/decomposition of LSCF, which is not readily observable in the typical porous-structured electrode.</P> [FIG OMISSION]</BR>
Choi, Woo Hee,Jung, Won Sang,Um, Yoo Hyun,Lee, Chang Uk,Park, Young Ha,Lim, Hyun Kook Elsevier 2017 Journal of affective disorders Vol.208 No.-
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Although there is substantial evidence of associations between frontal-striatal circuits and cerebral vascular burden in late-onset depression (LOD), relationships between vascular burden and hippocampal subfields are not clear. The purpose of this study was to investigate relationships between cerebral vascular burden and hippocampal subfield volume in LOD patients.</P> <P><B>Methods</B></P> <P>Fifty subjects with LOD and 50 group-matched healthy control subjects underwent magnetic resonance imaging scanning. Hippocampal subfields volumes were measured and compared between the groups. In addition, association patterns between white matter hyperintensity (WMH) volumes, clinical measures and hippocampal subfield volumes were investigated in the LOD group.</P> <P><B>Results</B></P> <P>Subjects with LOD exhibited significant hippocampal volume reductions in the total hippocampus, cornu ammonis (CA) 1 and 3 and dentate gyrus (DG) areas compared with healthy subjects. Total WMH volume was negatively correlated with left total hippocampal volume and CA1 in the LOD group. In addition, depression severity was negatively associated with left and right CA3 volumes in the LOD group.</P> <P><B>Limitation</B></P> <P>Our findings of distinctive relationships between WMH and hippocampal subfields demonstrate a simple correlation, but do not prove causation</P> <P><B>Conclusion</B></P> <P>This study is the first to elaborate distinctive association patterns between hippocampal subfield volumes and cerebral vascular burden in LOD. These structural changes in the hippocampal CA1, CA3 and DG areas might be at the core of the underlying neurobiological mechanisms of hippocampal dysfunction in LOD. However, longitudinal studies will be needed to identify the mechanisms of these structural changes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study is the first to elaborate distinctive association patterns between hippocampal subfield volumes and cerebral vascular burden in LOD. </LI> <LI> White matter hyperintensity was negatively correlated with left total hippocampal volume and CA1 in the LOD group. </LI> <LI> In addition, depression severity was negatively associated with left and right CA3 volumes in the LOD group. </LI> </UL> </P>
Choi, Min-Sue,Yoon, In-Sun,Rhee, Yong,Choi, Seung-Kook,Lim, Sun-Hyung,Won, So-Youn,Lee, Yeon-Hee,Choi, Hong-Soo,Lee, Suk-Chan,Kim, Kook-Hyung,Lomonossoff, George,Sohn, Seong-Han The Korean Society of Plant Pathology 2008 Plant Pathology Journal Vol.24 No.3
The transient and rapid expression system of a foreign protein in planta is a very useful technique in biotechnology application. We have investigated optimum condition of Agrobacterium-infiltration technique in which expression level of foreign proteins were maximized without detrimental effects on plants using GFP and Cucumber mosaic virus 2b protein, which is known as an enhancer of gene expression and a suppressor of post-transcriptional gene silencing(PTGS). The optimum expression level of both RNA and protein of GFP with minimum leaf impairment was obtained at $OD_{600}$=0.2 of Agrobactrium inocula. The steady-state levels of GFP RNA and protein generally peaked at 3 and 7 days post-infiltration(dpi), respectively. In the presence of 2b, both the magnitude and duration of GFP expression was highly increased and we could detect GFP level until 17 dpi. On the other hands, the 2b-mediated higher accumulation of foreign proteins resulted in the repression of normal leaf growth, possibly due to the limitation of supply of energy or materials required for growth maintenance. Using this Agrobacterium-infiltration system with 2b and GFP, we tested a hypothesis for the threshold model of PTGS initiation. Four GFP transgenic lines of N. benthamiana, which shows different expression level of GFP were tested to determine the threshold level for PTGS initiation. Agrobacterium-infiltration of GFP into those GFP-transgenic plants resulted in the co-silencing of the transgenic GFP. It was found that very low concentration of Agrobacterium with GFP and GFP+2b($OD_{600}$=0.002-0.02) which could not phenotypically induce an additive GFP expression, was enough to trigger PTGS pathway in all GFP transgenic plants. This strongly indicates that each GFP-transgenic plant should be expressing the transgenic GFP at its own pre-determined level and there was no buffer zone of additive GFP-expression to the threshold. In other words, the PTGS seems to be immediately activated as a self-defensive mechanism if an internal balance of gene expression is broken.
Won, Jong Kook,Hwang, Chahwan,Ahn, Kyunghan,Choi, Seong-Young,Lee, Yongkyu,Kim, Jaehyun,Lee, Yangjin,Park, Sung Kyu,Chung, In,Kim, Choongik,Kim, Kwanpyo,Ahn, Sang Hyun,Lee, Min Hyung,Kim, Myung-Gil Elsevier 2019 Journal of solid state chemistry Vol.278 No.-
<P><B>Abstract</B></P> <P>Two-dimensional (2D) metal dichalcogenide nanomaterials have been receiving enormous research interest for electronic, optoelectronic, and catalytic applications. However, the facile tunability of alloying and doping, as well as the successful formation of ideal defect-free nanoplate morphology have been hardly achieved for 2D nanomaterials. Herein, we successfully synthesized a series of 2D solid-solution SnS<SUB>x</SUB>Se<SUB>2−x</SUB> particles of 0.20–2.00 μm width and 30–68 nm thickness with morphological defect-free nanoplate via a solvothermal reaction. With controlled reactivities of elemental chalcogen precursors, a co-surfactant hexylamine together with a structure-directing agent polyvinylpyrrolidone was found to be essential for realizing ideal defect-free nanoplate morphology of SnS<SUB>x</SUB>Se<SUB>2−x</SUB> particles without either cabbage-like or twinned structure. The successful synthesis of morphologically defect-free SnS<SUB>x</SUB>Se<SUB>2−x</SUB> nanoplates with rationally controlled energy band gaps ranging from 1.36 eV for SnSe<SUB>2</SUB> to 1.96 eV for SnS<SUB>2</SUB> could provide promising materials for electronics, optoelectronics, and electrocatalytic applications.</P> <P><B>Graphical abstract</B></P> <P>With chalcogen source control and surfactant/co-surfactant usage, morphologically defect free SnS<SUB>x</SUB>Se<SUB>2−x</SUB> nanoplates alloys were synthesized by facile solvothermal reaction.</P> <P>[DISPLAY OMISSION]</P>