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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.
Lee, Jaewook,Kim, JiEun,Go, Jun,Lee, Jong Ho,Han, Dong-Wook,Hwang, DaeYoun,Lee, Jaebeom Elsevier 2015 Colloids and surfaces Biointerfaces 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>
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>
Investigation of carbon nanomaterials via metal-oxide catalytic pyrolysis of waste mask
Do Hyun Lee(Do Hyun Lee),Jaewook Myung(Jaewook Myung) 유기성자원학회 2022 유기성자원학회 학술발표대회논문집 Vol.2022 No.추계
Owing to the continuous demand for masks caused by the continued COVID-19, several waste masks made of recalcitrant plastics have accumulated in nature, causing environmental and societal problem in the waste management process for smart cities. To deal with this present issue, metal-oxide catalytic pyrolysis process was conducted. The catalyst was prepared using nickel and iron through the impregnation method in which metal oxide (alumina (Al2O3) and zeolite (ZSM-5)) were selected as a support. Carbon nanomaterials were observed on the nickel-doped metal oxide catalyst surface, and a growth mechanism of carbon nanomaterial on the surface of iron-nickel doped zeolite was identified by Transmission Electron Microscope (TEM). These findings are expected to contribute to the development of sustainable plastic recycling technology aimed at creating value-added products in connection with the government's waste upcycling project.
Multi-Material Topology Optimization of Magnetic Actuator With Segmented Permanent Magnets
Lee, Jaejoon,Lee, Seung-Wook,Kim, Kyungmok,Lee, Jaewook IEEE 2018 IEEE transactions on magnetics Vol.54 No.7
<P>This paper proposes the multi-material topology optimization for the simultaneous design of segmented permanent magnet (PM) arrays, coil, and iron materials in magnetic actuators. Specifically, the proposed approach can find the optimal layout and shape of PM, coil, and iron materials, as well as the optimal border and magnetization direction of segmented PM arrays. For designing the layout and shape of actuator components, the discrete material optimization-type material interpolation scheme is employed in this paper. To attain the design of segmented PM arrays, an orientation design variable in Cartesian coordinate is utilized with the penalization scheme for the discrete PM magnetization directions. To validate the effectiveness of the proposed actuator design approach, two numerical examples are presented. In the examples, the actuator components (i.e., segmented PM arrays, coil winding, and back iron) are designed aiming for maximizing the magnetic force magnitude acting on the actuator plunger.</P>