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Kim, Mal Geum,Kang, Tae Woong,Park, Joon Yeong,Park, Seung Hun,Ji, Yun Bae,Ju, Hyeon Jin,Kwon, Doo Yeon,Kim, Young Sik,Kim, Sung Won,Lee, Bong,Choi, Hak Soo,Lee, Hai Bang,Kim, Jae Ho,Lee, Bun Yeoul,Mi Elsevier 2019 Materials science & engineering. C, Materials for Vol.103 No.-
<P><B>Abstract</B></P> <P>We have designed and characterized an injectable, electrostatically bonded, <I>in situ</I>–forming hydrogel system consisting of a cationic polyelectrolyte [(methoxy)polyethylene glycol-<I>b</I>-(poly(ε-caprolactone)-<I>ran</I>-poly(L-lactic acid)] (MP) copolymer derivatized with an amine group (MP-NH<SUB>2</SUB>) and anionic BMP2. To the best of our knowledge, there have been hardly any studies that have investigated electrostatically bonded, <I>in situ</I>–forming hydrogel systems consisting of MP-NH<SUB>2</SUB> and BMP2, with respect to how they promote <I>in vivo</I> osteogenic differentiation of human turbinate mesenchymal stem cells (hTMSCs). Injectable formulations almost immediately formed an electrostatically loaded hydrogel depot containing BMP2, upon injection into mice. The hydrogel features and stability of BMP2 inside the hydrogel were significantly affected by the electrostatic attraction between BMP2 and MP-NH<SUB>2</SUB>. Additionally, the time BMP2 spent inside the hydrogel depot was prolonged <I>in vivo</I>, as evidenced by <I>in vivo</I> near-infrared fluorescence imaging. Biocompatibility was demonstrated by the fact that hTMSCs survived <I>in vivo</I>, even after 8 weeks and even though relatively few macrophages were in the hydrogel depot. The osteogenic capacity of the electrostatically loaded hydrogel implants containing BMP2 was higher than that of a hydrogel that was simply loaded with BMP2, as evidenced by Alizarin Red S, von Kossa, and hematoxylin and eosin staining as well as osteonectin, osteopontin, osteocalcin, and type 1α collagen mRNA expression. The results confirmed that our injectable, <I>in situ</I>–forming hydrogel system, electrostatically loaded with BMP2, can enhance <I>in vivo</I> osteogenic differentiation of hTMSCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> An injectable, electrostatically bonded, <I>in situ</I>–forming hydrogel system consisting of a cationic polyelectrolyte copolymer derivatized with an amine group and anionic BMP2 was prepared. </LI> <LI> The hydrogel features and stability of BMP2 inside the hydrogel were significantly affected by the electrostatic attraction between BMP2 and cationic polyelectrolyte copolymer. </LI> <LI> The electrostatically loaded hydrogel enhanced osteogenic differentiation of human turbinate mesenchymal stem cells better than one with simple loading of BMP2. </LI> </UL> </P>
Collision-avoidance radar-system antenna for a smart UAV
Lee, Hyeon-Cheol,Kim, In-Kyu,Yun, Tae-Yeoul Wiley Subscription Services, Inc., A Wiley Company 2005 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.44 No.6
<P>This paper presents the optimization of antennas for the collision-avoidance radar system of an unmanned aerial vehicle (UAV). Geometric parameters and radiation patterns are compared among horn, parabolic, cassegrain, and offset-cassegrain antennas. Based on the sidelobe levels of the calculated radiation patterns and sizes, the parabolic antenna shows the best results: a sidelobe of less than −30 dB and gain of 37 dBi with a focal length of 21.3 cm and a diameter of 26 cm. This research is explored for the first time to the authors' knowledge and the should be useful in the UAV. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 498–501, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20678</P>
On the Existence of Solutions for Nonlinear Funtional Evolution Equations in Banach Spaces
Park, Jong Yeoul,Son, Kuk Hyeon,Kim, Do Sang 부산대학교 기초과학연구소 1993 부산대학교 기초과학연구소 연구논문집 Vol.13 No.-
Let X be a real Banach space with norm ∥·∥. Let PC be the space of piecewise continuous funtions Ψ:[-r,0]→X for a fixed r>0. In this paper we establish the existence of the limit solution of the following abstract nonlinear functional evolution equation (FDE;Φ){u'(t) = A(t)u(t)+G(t,ut), t∈[t,T], {u__(0) = Φ, Φ∈ PC where u:[-r,T]→X is an unknown function. {A(t):t∈[0,T]} is a given family of nonlinear operators on X, G :[0,T]×PC→X is a given fuction, and Φ:[-r,0]→X is Lipschitzian. The symbol u_(t) denotes toe function u_(t)(θ) = u(t+θ) θ∈[-r,0].
우재열,김진수,장훈,김영현,Woo, Jae-Yeoul,Kim, Jin-Soo,Jang, Hoon,Kim, Young-Hyeon 한국농공학회 2011 한국농공학회논문집 Vol.53 No.2
This study was conducted to investigate the effect of hydropower factors (watershed, gross head), operation ratio and unit electricity cost on the benefit-cost ratio (B/C ratio) of small hydropower using agricultural reservoirs. The equation of B/C ratio was expressed as a function of watershed area, gross head, operation ratio and unit electricity cost. The benefit increased with watershed area, gross head and unit electricity cost, while the cost increased with watershed area and gross head but decreased with operation ratio. The B/C ratio increased with watershed area, gross head, operation ratio and unit electricity cost. While the effect of gross head on the B/C ratio decreased with watershed area, the effect of operation ratio and unit electricity cost on the B/C ratio increased with watershed area. The operation ratio is an important factor to affect the B/C ratio and therefore we need to develop hydropower for the heightened dams to expect high operation ratio due to continuous water release. The unit electricity cost is also an important factor to affect the B/C ratio and the B/C ratio was always below 1 unless unit electricity cost is over 60 Won/kWh under given conditions. The reservoirs with economic feasibility for small hydropower development were three in 21 when the equation of B/C ratio was appled to the study reservoirs. The results can be used to choose the appropriate reservoir with economic feasibility for development of small hydropower.