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Wonjun Jo,Byoungseung Yoo 한국식품영양과학회 2018 Preventive Nutrition and Food Science Vol.23 No.3
The effects of cellulose gums (CG), such as carboxymethyl cellulose (CMC) and hydroxypropyl methylcellulose (HPMC), on the flow and dynamic rheological properties of binary mixtures of xanthan gum (XG) and locust bean gum (LBG) were examined at different XG/LBG/CG mixing ratios (50/50/0, 47.5/47.5/5.0, 45/45/10, and 42.5/42.5/15.0). All XG/LBG/CG ternary mixtures showed high shear-thinning behavior and the flow behavior index values of samples containing HPMC were lower than those of samples containing CMC. An increase in consistency index and apparent viscosity values was observed for ternary gum mixtures containing HPMC, indicating that the flow properties of the XG/LBG binary mixture were affected by the content of HPMC. Storage modulus and loss modulus values of ternary gum mixtures decreased with an increase in CG content from 5 to 15%. The maximum viscoelasticity of XG/LBG/CG mixtures was observed at a mixing ratio of 47.5/47.5/5.0. These findings suggest that the rheological properties of XG/LBG binary mixtures were strongly influenced by the addition of CMC and HPMC.
Jo, Wonjun,Bak, June Ha,Yoo, Byoungseung Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.114 No.-
<P><B>Abstract</B></P> <P>The steady and dynamic shear rheological properties of binary gum mixtures with xanthan gum (XG) and galactomannans (guar gum (GG) and locust bean gum (LBG)) were examined in a concentrated solution (1% w/w) as a function of gum mixing ratio (100/0, 75/25, 50/50, and 0/100). All samples, except for individual GG and LBG, showed high shear-thinning behavior with yield stress. The values of flow (K, η<SUB>a,50</SUB>, and σ<SUB>oc</SUB>) and dynamic rheological parameters (G′ and G″) of XG-GG and XG-LBG mixtures were significantly higher compared to XG alone, indicating that the flow and viscoelastic properties of binary gum mixtures were greatly affected by the addition of GG and LBG. The maximum elasticity synergistic interaction for XG-galactomannans mixtures was observed at a mixing ratio of 50/50, showing a greatly positive deviation between measured and calculated values of G′. These results suggest that the synergistic effect of GG and LBG addition on rheological properties of XG appears to be due to intermolecular interaction occurred between XG and galactomannans, as confirmed by dynamic rheological properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effect of gum mixing ratio on rheological properties of binary gum mixtures were examined. </LI> <LI> A maximum synergy for XG-GMs mixtures was observed at a 50/50 mixing ratio. </LI> <LI> The molecular interaction between XG and LBG was much stronger when compared to XG-GG. </LI> <LI> A small addition of GMs to XG was more efficient in terms of improving a safe and easy swallowing. </LI> <LI> Rheological results can be useful in designing new XG-based food thickeners for patients with dysphagia. </LI> </UL> </P>
Adaptive Push-Pull Protocols for P2P-Based Video Streaming
JO, Duhwan,HELAL, Sumi,KIM, Eunsam,LEE, Wonjun,LEE, Choonhwa The Institute of Electronics, Information and Comm 2011 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.eb94 No.10
<P>This paper presents novel hybrid push-pull protocols for peer-to-peer video streaming. Our approaches intend to reap the best of push- and pull-based schemes by adaptively switching back and forth between the two modes according to video chunk distributions. The efficacy of the proposed protocols is validated through an evaluation study that demonstrates substantial performance gains.</P>
열확산계수가 다른 균일물질에 대한 동적 엑서지 분석법과 비정상상태 엑서지 분석법의 비교
조하빈(Jo, Ha-Bin),최원준(Choi, Wonjun) 대한건축학회 2023 대한건축학회 학술발표대회 논문집 Vol.43 No.1
Small temperature differences between a target system and reference state characterize thermal exergy phenomena in the built environment. Exergy analysis results change significantly with temporal changes in environmental conditions, limiting the applicability of steady-state exergy analyses. Dynamic exergy analyses have been used to mitigate these limitations, but they neglect the effect of heat capacity and only change the boundary condition over time. Recently, an unsteady-state exergy analysis method that does not violate the thermodynamic integrity has been established. In this study, the difference between dynamic and unsteady-state analyses are compared with materials of different thermal diffusivity to clarify the limitation of the dynamic analysis and the necessity of unsteady-state exergy analyses.