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- 저자 : Jaewook Lee (검색결과 823 건)
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Reliability-guaranteed multipath allocation algorithm in mobile network
Jaewook Lee(Jaewook Lee),Haneul Ko(Haneul Ko) 한국전자통신연구원 2022 ETRI Journal Vol.44 No.6
The mobile network allows redundant transmission via disjoint paths to support high-reliability communication (e.g., ultrareliable and low-latency communications [URLLC]). Although redundant transmission can improve communication reliability, it also increases network costs (e.g., traffic and control overhead). In this study, we propose a reliability-guaranteed multipath allocation algorithm (RG-MAA) that allocates appropriate paths by considering the path setup time and dynamicity of the reliability paths. We develop an optimization problem using a constrained Markov decision process (CMDP) to minimize network costs while ensuring the required communication reliability. The evaluation results show that RG-MAA can reduce network costs by up to 30% compared with the scheme that uses all possible paths while ensuring the required communication reliability.
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Lee, Jaewook,Kim, JiEun,Go, Jun,Lee, Jong Ho,Han, Dong-Wook,Hwang, DaeYoun,Lee, Jaebeom Elsevier 2015 Colloids and Surfaces B Vol.135 No.-
<P><B>Abstract</B></P> <P>The biological activities and therapeutic potential of phytochemical-decorated Au nanoparticles (Phyto-AuNPs) were investigated through the treatment of Phyto-AuNPs on the dorsal skin of rats via transdermal drug delivery process in order to regenerate surgical wounded and burned skin. Two different Phyto-AuNPs were applied to the dorsal skin: gallic acid–isoflavone – covered AuNPs (GI-AuNPs) and protocatechuic acid–isoflavone – covered AuNPs (PI-AuNPs). From the biological activity monitoring, it has been resulted that 5-fold thicker epidermis (ER), 50% reduction of metalloproteinase-1 (MMP-1) level, 3-fold higher superoxide dismutase (SOD) activity were obtained in the Phyto-AuNP-treated group, compared with a vehicle group (deionized water (DI-water) treatment). Moreover, the Phyto-AuNPs treatment on the surgical and burn damaged Sprague-Dawley (SD) rats induced higher expression of vascular endothelial growth factor (VEGF) and angiopoietin-2 (Ang-2). It would be plausible that antioxidant property of Phyto-AuNPs assist the acceleration and activation of biomolecules in the healing mechanism, where Phyto-AuNPs can be potential candidates for skin regeneration and wound healing.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Phytochemical decorated Au nanoparticles (Phyto-AuNPs) have been eco-friendly synthesized using gallic acid, protocatechuic acid and isoflavone without thermal and pressure assistance. </LI> <LI> According to hairless mouse dorsal skin test, it was proved that Phyto-AuNPs exhibited anti-oxidant effect and skin regeneration property. </LI> <LI> Phyto-AuNPs also showed wound healing properties for surgically damaged and burned dorsal skins of SD rats via transdermal treatment. </LI> <LI> These bioactive nanomaterials can be used for the excellent skin therapy agents. </LI> </UL> </P>
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Jaewook Lee,Jaeman Jang,Hyeongjung Kim,Jiyoul Lee,Bang-Lin Lee,Sung-Jin Choi,Dong Myong Kim,Dae Hwan Kim,Kyung Rok Kim IEEE 2014 IEEE electron device letters Vol.35 No.3
<P>The physical origins of the negative-bias stress (NBS) instability in polymer-based thin-film transistors have been characterized. Through the quantitative analysis by TCAD simulation for the NBS time-dependent experimental results, the threshold voltage (V<SUB>T</SUB>)-shift by sub-bandgap density-of-states redistribution forms 70% and 78% for the measured total V<SUB>T</SUB>-shift while V<SUB>T</SUB>-shift by gate oxide charge trapping only takes 30% and 22% at NBS time of 3000 and 7000 s, respectively. In addition, the increase of source/drain Schottky contact resistance (R<SUB>SD</SUB>) is the main reason for NBS-induced on -current (I<SUB>ON</SUB>) degradation.</P>
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