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이성호,김광락,안도희,유재형,백승우,손종식,임성팔,정홍석 한국공업화학회 2001 응용화학 Vol.5 No.2
Hydrogen absorption experiments were carried out by the titanium(Ti) sponge for investigating the characteristics of hydrogen absorption. From experimental results, Ti sponges showed the high hydrogen absorption capacity inspite of low reaction temperature. The H/M which mean the capacity of hydrogen absorption was measured 2.0 for Ti sponge in the experimental condition of 25℃. The effects of the reaction temperature, activation conditions, and the presence of helium in the hydrogen were investigated.
The Pattern Recognition System Using the Fractal Dimension of Chaos Theory
Shon, Young-Woo Korean Institute of Intelligent Systems 2015 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.15 No.2
In this paper, we propose a method that extracts features from character patterns using the fractal dimension of chaos theory. The input character pattern image is converted into time-series data. Then, using the modified Henon system suggested in this paper, it determines the last features of the character pattern image after calculating the box-counting dimension, natural measure, information bit, and information (fractal) dimension. Finally, character pattern recognition is performed by statistically finding each information bit that shows the minimum difference compared with a normalized character pattern database.
Shon, Jong Sik,Kim, Gi Yong,Im, Junhyuck Elsevier 2019 Annals of nuclear energy Vol.124 No.-
<P><B>Abstract</B></P> <P>The Korea Atomic Energy Research Institute (KAERI) is planning the construction of the KIJANG Research Reactor (KJRR), which is currently undergoing licensing procedures. The fission <SUP>99</SUP>Mo production process (FMPP) of the KJRR generates intermediate-level liquid waste (ILLW) and alumina residue (Al<SUB>2</SUB>O<SUB>3</SUB> cake), which is a solid waste. In the present study, an efficient method of reducing the amount of generated cement waste form by mixing the ILLW and Al<SUB>2</SUB>O<SUB>3</SUB> cake together, into low-level waste, was developed. The purpose of this study was to determine if the cement waste form produced by mixing cement with the waste from the FMPP would satisfy the acceptance criteria of a low- and intermediate-level waste disposal facility in Korea. The process operating range and the optimum operating conditions were found by investigating the mixability of the cement waste form, by considering the presence of free standing water after curing, and by performing a water immersion test depending on the mixing ratios of Portland cement (type I), ILLW, and Al<SUB>2</SUB>O<SUB>3</SUB> cake. The feasibility of treating the cement waste form produced under the optimum operating conditions was evaluated in relation to the acceptance criteria of a low- and intermediate-level waste disposal facility in Korea. The results showed that the cement waste form satisfied the acceptance criteria with regard to structural stability (compressive strength test, thermal cycling test, water immersion test, and irradiation test) and leachability (leaching test).</P>
Shon, S.-D.,Hwang, K.-J.,Lee, S.-J. Springer Science and Business Media 2014 Journal of Central South University Vol.21 No.3
The buckling behavior of single layer space structure is very sensitive. The joint rigidity, moreover, is one of the main factors of stability which may determine the entire failure behavior. Thus, the reasonable stiffness of joint system, which is neither total pin assumption nor perfect fix condition, is very important to apply to the real single layer space one. Therefore, the purpose of this work was to investigate the buckling behavior of single layer space structure, using the development of the upgraded stiffness matrix for the joint rigidity. To derive tangential stiffness matrix, a displacement function was assumed using translational and rotational displacement at the node. The geometrical nonlinear analysis was simulated not only with perfect model but also with imperfect one. As a result, the one and two free nodal numerical models were investigated using derived stiffness matrix. It was figured out that the buckling load increases in proportion to joint rigidity with rise-span ratio. The stability of numerical model is very sensitive with the initial imperfection, responding of bifurcation in the structure.
ToF‐SIMS imaging and spectroscopic analyses of PEG‐conjugated AuNPs
Shon, Hyun Kyong,Son, Miyoung,Park, Kyong Mi,Rhee, Choong Kyun,Song, Nam Woong,Park, Hyun Min,Moon, Dae Won,Lee, Tae Geol John Wiley Sons, Ltd. 2011 Surface and interface analysis Vol.43 No.1
<P><B>Abstract</B></P><P>Gold nanoparticles (AuNPs) and poly(ethylene glycol) (PEG) are known safe materials to be used <I>in vivo</I>, and so, are becoming increasingly important in biomedical applications. Here, the stability of PEG‐conjugated AuNPs in an aqueous solution was monitored as a function of time using several techniques, namely dynamic light scattering (DLS)‐size analysis, UV‐visible absorption spectrometry and ToF‐SIMS. Roughly 15‐nm‐sized AuNPs were synthesized and pegylated with mPEG (MW = 5 kDa). Four different samples were synthesized, depending on whether or not a dialysis procedure was performed right after synthesis of the AuNPs or pegylation of the AuNPs. The DLS results show that size of mPEG‐conjugated AuNPs and standard deviation increased in cases where a dialysis procedure was performed after pegylation of the AuNPs, indicating aggregation of the AuNPs due to the detachment of mPEG ligands from the surface of the AuNPs. Also, results from UV‐visible absorption spectra and ToF‐SIMS images point to the likelihood that free mPEG ligands in solution help prevent aggregation by maintaining a dynamic equilibrium between the conjugated ligands on the surface of the AuNPs and the free ligands in the aqueous solution. Conversely, once free, mPEG ligands were eliminated from the solution by dialysis and conjugated mPEG ligands detached from the surface of AuNPs into the solution, suspension stability lowered and the AuNPs showed signs of aggregation. We believe that the ToF‐SIMS imaging analysis with DLS and UV‐visible absorption analyses would be useful to study the stability of PEG‐conjugated AuNPs in different environmental conditions. Copyright © 2010 John Wiley & Sons, Ltd.</P>
Shon, Byung Hoon,Jung, Chung Woo,Kwon, Oh Jin,Choi, Chang Kyoung,Tae Kang, Yong Elsevier 2018 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.122 No.-
<P><B>Abstract</B></P> <P>Refrigerants have been continuously developed to improve their thermal performances and to deal with relevant environmental issues. Recently, regulations on refrigerants are being intensified due to the global warming. To meet the enhanced environmental standards, low global warming potential (GWP) refrigerants have been developed. In this study, experimental studies are conducted to investigate the characteristics of condensation heat transfer and frictional pressure drop for R-1233zd(E). The experiments are carried out under partial condensation conditions in a plate heat exchanger to measure temperature, pressure and mass flow rate. Heat transfer coefficients and frictional pressure drops with respect to mean vapor qualities are yielded. During the partial condensation process, the heat transfer coefficients increases as the mass and heat fluxes increase. However, no significant change in frictional pressure drop is observed when the heat flux changes. It is concluded that other correlations for Nusselt number and pressure drop from the literature cannot be applied for the low GWP refrigerant, R-1233zd(E), and the present experimental correlations agree well with the experimental results with the error bands of ±20%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The condensation heat transfer and pressure drop in PHE with R-1233zd(E) are experimentally tested. </LI> <LI> No significant change in frictional pressure drop is observed when the heat flux changes. </LI> <LI> The present experimental correlations agree well with the experimental results with the error bands of ±20%. </LI> <LI> Other correlations from the literature cannot be applied for the low GWP refrigerant, R-1233zd(E). </LI> </UL> </P>