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Y.M.Chae,G.H.Choe,H.S.Mok,E.W.Lee,S.C.Hong,S.H.Baek,Kon-Kuk,Seoul National Polytechnic Unv,ChungNam Unv,Dan-Kook Unv,Dong-guk Unv 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
Three phase diode rectifier are widely used in high power rating system because of simple structure and low cost. But AC spiky input current which has plentiful harmonics flows to the power line and cause low input power factor. So this paper represents harmonics analysis and characteristic analysis of. DPF, THD and PF of input current.<br/> And conducted EMI emission which can be measured using IISN(L. me Impedance Stabilization Network), is studied in case of three phase diode rectifier to investigate the behavior of Conducted EMI emission .
유동 및 응고 시뮬레이션을 활용한 회전자 패밀리 금형의 오버플로우 설계 방안
정재민 ( J M Jung ),김창완 ( C W Kim ),( Tam Nguyen Van ),이경민 ( K M Lee ),국중민 ( J M Kuk ),진현기 ( H G Jin ),홍성길 ( S K Hong ) 한국주조공학회 2013 한국주조공학회지 Vol.33 No.5
The family mold casting have advantages which are able to make products with different shapes and dimensions simultaneously in a single mold. In this study, the design of the 4 cavity rotor family mold was used by “Anycasting” software, the defects occurred during die casting were predicted and suggested the best optimization conditions for sound products. The result of the experiment were that the optimum overflow design was needed for gas emission and control of residual oxides. It was clear that the defects positions formed by diecasting were agreed with nearly them predicted by simulation.
Kim, Sung Kuk,Sessler, Jonathan L.,Gross, Dustin E.,Lee, Chang-Hee,Kim, Jong Seung,Lynch, Vincent M.,Delmau, Lætitia H.,Hay, Benjamin P. American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.16
<P>An ion-pair receptor, the calix[4]pyrrole-calix[4]arene pseudodimer <B>2</B>, bearing a strong anion-recognition site but not a weak cation-recognition site, has been synthesized and characterized by standard spectroscopic means and <I>via</I> single-crystal X-ray diffraction analysis. In 10% CD<SUB>3</SUB>OD in CDCl<SUB>3</SUB> (v/v), this new receptor binds neither the Cs<SUP>+</SUP> cation nor the F<SUP>−</SUP> anion when exposed to these species in the presence of other counterions; however, it forms a stable 1:1 solvent-separated CsF complex when exposed to these two ions in concert with one another in this same solvent mixture. In contrast to what is seen in the case of a previously reported crown ether “strapped” calixarene−calixpyrrole ion-pair receptor <B>1</B> (J. Am. Chem. Soc. 2008, 130, 13162−<lpage>13166</lpage>), where Cs<SUP>+</SUP> cation recognition takes place within the crown, in <B>2</B>·CsF cation recognition takes place within the receptor cavity itself, as inferred from both single-crystal X-ray diffraction analyses and <SUP>1</SUP>H NMR spectroscopic studies. This binding mode is supported by calculations carried out using the MMFF94 force field model. In 10% CD<SUB>3</SUB>OD in CDCl<SUB>3</SUB> (v/v), receptor <B>2</B> shows selectivity for CsF over the Cs<SUP>+</SUP> salts of Cl<SUP>−</SUP>, Br<SUP>−</SUP>, and NO<SUB>3</SUB><SUP>−</SUP> but will bind these other cesium salts in the absence of fluoride, both in solution and in the solid state. In the case of CsCl, an unprecedented 2:2 complex is observed in the solid state that is characterized by two different ion-pair binding modes. One of these consists of a contact ion pair with the cesium cation and chloride anion both being bound within the central binding pocket and in direct contact with one another. The other mode involves a chloride anion bound to the pyrrole NH protons of a calixpyrrole subunit and a cesium cation sandwiched between two cone shaped calix[4]pyrroles originating from separate receptor units. In contrast to what is seen for CsF and CsCl, single-crystal X-ray structural analyses and <SUP>1</SUP>H NMR spectroscopic studies reveal that receptor <B>2</B> forms a 1:1 complex with CsNO<SUB>3</SUB>, with the ions bound in the form of a contact ion pair. Thus, depending on the counteranion, receptor <B>2</B> is able to stabilize three different ion-pair binding modes with Cs<SUP>+</SUP>, namely solvent-bridged, contact, and host-separated.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-16/ja100715e/production/images/medium/ja-2010-00715e_0014.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja100715e'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja100715e'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja100715e'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja100715e'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja100715e'>ACS Electronic Supporting Info</A></P>
Surface reconstruction and charge modulation in BaFe<sub>2</sub>As<sub>2</sub> superconducting film
Kim, S,Yi, S,Oh, M,Jang, B G,Nam, W,Yoo, Y-C,Lee, M,Jeon, H,Zoh, I,Lee, H,Zhang, C,Kim, K H,Seo, J,Shim, J H,Chae, J,Kuk, Y Institute of Physics 2018 Journal of Physics, Condensed Matter Vol.30 No.31
<P>Whether or not epitaxially grown superconducting films have the same bulk-like superconducting properties is an important concern. We report the structure and the electronic properties of epitaxially grown Ba(Fe<SUB>1−<I>x</I> </SUB>Co<SUB> <I>x</I> </SUB>)<SUB>2</SUB>As<SUB>2</SUB> films using scanning tunneling microscopy and scanning tunneling spectroscopy (STS). This film showed a different surface structure, <img ALIGN='MIDDLE' ALT='' SRC='http://ej.iop.org/images/0953-8984/30/31/315001/cmaacd85ieqn001.gif'/>R45° reconstruction, from those of as-cleaved surfaces from bulk crystals. The electronic structure of the grown film is different from that in bulk, and it is notable that the film exhibits the same superconducting transport properties. We found that the superconducting gap at the surface is screened at the Ba layer surface in STS measurements, and the charge density wave was observed at the surface in sample in the superconducting state.</P>
조정아,국민호,성연수,이수호,송태권,정순종,송재성,김명호,Cho J. A.,Kuk M.-H.,Sung Y. S.,Lee S. H.,Song T. K.,Jeong S. J.,Song J. S.,Kim M.-H. 한국재료학회 2005 한국재료학회지 Vol.15 No.10
Lead-free $[Bi_{0.5}(Na_{1-x}K_x)_{0.5}TiO_3](x=0\~1.0)$ ceramics were prepared using a solid state reaction method and their structural and electrical characteristics were investigated. X-ray investigations indicated that the rhombohedral-tetragonal morphotropic phase boundary(MPB) of the $[Bi_{0.5}(Na_{1-x}K_x)TiO_3$ ceramics exists in the range of $x=0.16\~0.20$. The optimum values of piezoelectric constant$(d_{33})$, dielectric constant, and electromechanical coupling factor $(k_p)$ were obtained at $x=0.16\~0.20$ of the MPB region.