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객체 지향적 슬레이브 로봇들로 구성된 홈서비스 로봇 시스템의 구현
고창건(Chang-gun Ko),고대건(Dae-gun Ko),권혜진(Hye-jin Kwan),박정일(Jung-il Park),이석규(Suk-gyu Lee) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
This paper proposes a new paradigm for cooperation of multi-robot system for home service. For localization of each robot, the master robot collects information of location of each robot based on communication of RFID tag on the floor and RFID reader attached on the bottom of the robot. The Master robot communicates with slave robots via wireless LAN to check the motion of robots and command to them based on the information from slave robots. The operator may send command to slave robots based on the HRI(Human - Robot Interaction) screened on masted robot using information from slave robots. The cooperation of multiple robots will enhance the performance comparing with single robot.
Pinecone-like Cu(II) crystal growth on the surface of amine-group-immobilized polymers
Ko, Young Gun,Shin, Dong Hun,Choi, Ung Su Wiley Subscription Services, Inc., A Wiley Company 2005 Journal of polymer science Part A, Polymer chemist Vol.43 No.6
<P>Field-emission scanning electron microscopy (FESEM) was used to monitor pinecone-like Cu(II) crystal growth on polymeric fibers for various growth times. In FESEM images, Cu(II) complexes and Cu(OH)<SUB>2</SUB> crystal growth on poly(acryloamidino ethylene amine) and poly(acryloamidino diethylenediamine) were observed. Up to an elapsed time of 16 min, crystal growth was observed in only one direction. However, after an elapsed time of 20 h, pinecone-like crystals covered the entire surfaces of the synthesized polymers. Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were used for analysis. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 1238–1247, 2005</P> <B>Graphic Abstract</B> <P>Cu(II) complexes and Cu(OH)<SUB>2</SUB> crystal growth on poly(acryloamidino ethylene amine) (a chelating polymer) were observed at various elapsed growth times. Up to an elapsed time of 16 min, crystal growth was observed in only one direction. After an elapsed time of 20 h, pinecone-like crystals covered the entire surface of synthesized poly(acryloamidino ethylene amine) fiber. <img src='wiley_img/0887624X-2005-43-6-POLA20619-gra001.gif' alt='wiley_img/0887624X-2005-43-6-POLA20619-gra001'> </P>
Cavitation Behavior of Ultra-Fine Grained Ti-6Al-4V Alloy Produced by Equal-Channel Angular Pressing
Ko, Young Gun,Kwon, Yong Nam,Lee, Jung Hwan,Shin, Dong Hyuk,Lee, Chong Soo Trans Tech Publications, Ltd. 2007 Materials science forum Vol.551 No.-
<P>Cavitation behavior during superplastic flow of ultra-fine grained (UFG) Ti-6Al-4V alloy was established with the variation of grain size and misorientation. After imposing an effective strainup to 8 via equal-channel angular pressing (ECAP) at 873 K, alpha-phase grains were markedly refined from 11 μm to ≈ 0.3 μm, and misorientation angle was increased. Uniaxial-tension tests were conducted for initial coarse grained (CG) and two UFG alloys (ε = 4 and 8) at temperature of 973 K and strain rate of 10-4 s-1. Quantitative measurements of cavitation evidenced that both the average size and the area fraction of cavities significantly decreased with decreasing grain size and/or increasing misorientation. It was also found that, when compared to CG alloy, cavitation as well as diffused necking was less prevalent in UFG alloys, which was presumably due to the higher value of strain-rate sensitivity. Based on the several theoretical models describing the cavity growth behavior, the cavity growth mechanism in UFG alloys was suggested.</P>
Ko, Young Gun,Lee, Kang Min,Shin, Dong Hyuk The Japan Institute of Metals 2011 MATERIALS TRANSACTIONS Vol.52 No.8
<P>The paper demonstrated the electrochemical corrosion properties of the oxide film of AZ91 Mg alloy subjected to plasma electrolytic oxidation (PEO) coating in an electrolyte containing zirconia and additional heat treatment. Surface observation revealed that a number of zirconia particles were successfully incorporated and were also uniformly distributed throughout the oxide film. After subsequent heat treatment, the relative fraction of Mg(OH)<SUB>2</SUB> decreased whilst the fraction of MgO increased in the oxide film due to the dehydration reaction at 423 K. From the results of electrochemical impedance spectroscopy, the excellent corrosion resistance of AZ91 Mg alloy could be achieved via PEO coating together with annealing treatment. Electrochemical response underlying corrosion response of the present alloy was discussed in relation to equivalent circuit model.</P>
Superplastic deformation behavior of ultra-fine-grained 5083 Al alloy using load-relaxation tests
Ko, Young Gun,Shin, Dong Hyuk,Park, Kyung-Tae,Lee, Chong Soo Elsevier 2007 Materials science & engineering. properties, micro Vol.449 No.-
<P><B>Abstract</B></P><P>In this study, superplastic deformation behavior of ultra-fine-grained (UFG) 5083 Al alloy was investigated in the context of inelastic deformation theory. By imposing an effective strain of 8 <I>via</I> equal-channel angular pressings, most of the grains were significantly refined to 0.3μm with non-equilibrium boundaries. A series of tension and load-relaxation tests was carried out to measure elongations and to obtain flow curves of UFG alloy at strain rates of 10<SUP>−4</SUP> to 10<SUP>−2</SUP>s<SUP>−1</SUP> and at temperatures of 498–548K corresponding to 0.58–0.65 <I>T</I><SUB>m</SUB>. The UFG alloy exhibited much higher elongations than the coarse grain alloy at the same temperatures and strain rates, indicating that low-temperature superplasticity was achieved by UFG alloy in spite of its non-equilibrium grain boundaries. Quantitative analysis on deformation mechanisms of UFG alloy was made and compared with those of coarse grain alloy.</P>
Hierarchically Porous Aminosilica Monolith as a CO<sub>2</sub> Adsorbent
Ko, Young Gun,Lee, Hyun Jeong,Kim, Jae Yong,Choi, Ung Su American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.15
<P>A facile strategy is successfully developed for the centimeter-scale preparation of hierarchically porous aminosilica monolith as a CO<SUB>2</SUB> adsorbent just by simple processes of solvent-evaporation-induced coating, self-assembly, and concentration of tetraethyl orthosilicate sol on the surface of a polymer foam template without any adhesive composite material or hydrothermal treatment. (3-Aminopropyl) trimethoxysilane is immobilized on the surface of silica monolith via a gas-phase procedure. The silica frameworks of the monolith mimic those of the polymer foam template at the macroscale, and the frameworks are composed of the SBA-15 structure at the nanoscale. The hierarchically porous structure demonstrates improved properties over the single-mode porous component, with the macroporous framework ensuring mechanical stability and good mass transport properties, while the smaller pores provide the functionality for CO<SUB>2</SUB> adsorption.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-15/am5029022/production/images/medium/am-2014-029022_0010.gif'></P>