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Lee, Kyoung Min,Kim, Hea Ji,Kang, Cheon-Soo,Tojo, Tomohiro,Chae, Ji Ae,Oh, Yuree,Cha, Min Chul,Yang, Kap Seung,Kim, Yoong Ahm,Kim, Hyungwoo The Royal Society of Chemistry 2019 Polymer chemistry Vol.10 No.7
<P>Porous polymer monoliths are of great importance as a multi-scale material in the fields of materials science and chemical engineering. Herein, we create compressible, microporous, composite monoliths that are capable of regulating macroscopic conductivity in response to external compressive force. The materials have been synthesized <I>via</I> a bottom-up approach and behave as sponge materials. The monolithic polymer networks could be prepared using various monomeric building blocks and further incorporated with carbon additives during condensation polymerization. Accordingly, physical properties, such as morphology, mechanical strength, and miscibility, were investigated. Taking advantage of microporosity of these frameworks, the carbon-containing composites were found to be fairly lightweight yet substantial, and non-conductive despite the presence of 10 wt% conductive carbon additives. However, the intrinsic compressibility of the networks significantly altered the resistivity of materials (<I>e.g.</I>, <I>ρ</I> < 10<SUP>2</SUP> Ω m) when the density of the materials increased following the application of an external force, which is comparable to doped silicon or other clays. As a proof of concept, we used the composite material as a switch for an electrical circuit. Therefore, we were able to repeatedly turn on and off a light-emitting diode in the circuit by hand.</P>
In Silico Study of the Ion Channel Formed by Tolaasin I Produced by Pseudomonas tolaasii
( Geun Hyeong Jo ),( Do Seok Hwang ),( Sun Hee Lee ),( Yoon Kyung Woo ),( Ji Ye Hyun ),( Yeon Joong Yong ),( Kyung Rai Kang ),( Dong Woon Kim ),( Yoong Ho Lim ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.10
A toxin produced by Pseudomonas tolaasii, tolaasin, causes brown blotch disease in mushrooms. Tolaasin forms pores on the cellular membrane and destroys cell structure. Inhibiting the ability of tolaasin to form ion channels may be an effective method to protect against attack by tolaasin. However, it is first necessary to elucidate the three-dimensional structure of the ion channels formed by tolaasin. In this study, the structure of the tolaasin ion channel was determined in silico based on data obtained from nuclear magnetic resonance experiments.
Microwave transmission characteristics of ZnO nanowire
Joon Hyong Cho,Hyong Seo Yoon,Whan Kyun Kim,Juhwan Lim,Ji Yoong Kang,Juyeong Oh,Ryong Ha,Jung Han Choi,Heon-Jin Choi,Seong Chan Jun IET 2012 Electronics letters Vol.48 No.17
<P>Electrical characteristics of single ZnO nanowire with various diameters at the high-frequency range are presented. Transmission characteristics were measured as <I>S</I>-parameter and RLC circuit simulation to deduce passive circuit elements. The result showed that the contact parameters were dominant as frequency increases. This study discovered the parasitic effects supposed to be minimised, contribute significantly to major signal transmission of ZnO nanowire and are crucial in developing such nano-electronic devices.</P>
Nonlinearity Control of Nanoelectromechanical Resonators
Hyong Seo Yoon,Whan Kyun Kim,Joon Hyong Cho,Ji Yoong Kang,Yongsoo Choi,Chulki Kim,Jae Hun Kim,Seok Lee,Jung Han Choi,Sang Uk Son,Duck-Hwan Kim,Insang Song,Seong Chan Jun IEEE 2012 IEEE electron device letters Vol.33 No.10
<P>To achieve high performance of nanoelectromechanical resonators in room-temperature and low-vacuum conditions, the precise control of electrothermal power is critical in not only frequency tuning but also regulating nonlinearity in the radio-frequency range. This study presents theoretical analysis and experimental results for controlling nonlinearity of nanoelectromechanical resonators using nonlinear damping and stiffness terms. Experiments show that, with increasing electrothermal power, critical amplitude increases up to where the resonators display linear harmonic oscillation. As a result, the linearity of the resonator that has been driven into the nonlinear regime can be reclaimed.</P>
A Peptide Produced by Pseudomonas tolaasi, Tolaasin Binds to Metal Ions
Lee, Sun-Hee,Jo, Geun-Hyeong,Hwang, Do-Seok,Woo, Yoon-Kyung,Lee, Young-Giu,Yong, Yeon-Joong,Kang, Kyung-Rai,Hyun, Ji-Ye,Kim, Young-Kee,Kim, Dong-Woon,Lim, Yoong-Ho The Korean Society for Applied Biological Chemistr 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.4
Brown blotch disease in mushrooms is caused by Pseudomonas tolaasin, which produces a peptide toxin, tolaasin I, and zinc ion inhibits the channel formed by tolaasin I. NMR experiments revealed that zinc, sodium, and calcium ions can bind to tolaasin I and their binding position on tolaasin I is the lactone ring.
Seong Chan Jun,Joon Hyong Cho,Whan Kyun Kim,Young Mo Jung,Sukju Hwang,Sangchul Shin,Ji Yoong Kang,Jeashik Shin,Insang Song,Jae-Young Choi,SangYoon Lee,Jong Min Kim IEEE 2009 IEEE electron device letters Vol.30 No.10
<P>We demonstrate the effect of nanoresonator geometry on the resonance property using a magnetomotive transduction technique for SiC nanoresonators in moderate conditions of pressure, temperature, and magnetic intensity. These trials were performed in conditions similar to those useful for practical applications to assist in the deployment of SiC-based nanoelectromechanical system prototype devices. This letter confirms that the resonant properties of a nanoscaled electromechanical resonator in moderate conditions are similar to those found during tests in ideal conditions. The resonance characteristics were analyzed based on the geometrical changes of the nanoresonator. The radio-frequency performance parameters such as the critical amplitude and dynamic range, which are crucial in the determination of linear operation range of nanoresonators, were maintained at a level comparable to those found under laboratory conditions. This letter brings this technology closer to practical applications in sensors, filters, and the oscillation of nanoscaled electromechanical devices.</P>
Short Communication : A Peptide Produced by Pseudomonas tolaasi, Tolaasin Binds to Metal Ions
( Sun Hee Lee ),( Geun Hyeong Jo ),( Do Seok Hwang ),( Yoon Kyung Woo ),( Young Giu Lee ),( Yeon Joong Yong ),( Kyung Rai Kang ),( Ji Ye Hyun ),( Young Kee Kim ),( Dong Woon Kim ),( Yoong Ho Lim ) 한국응용생명화학회(구 한국농화학회) 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.4
Brown blotch disease in mushrooms is caused by Pseudomonas tolaasin, which produces a peptide toxin, tolaasin I, and zinc ion inhibits the channel formed by tolaasin I. NMR experiments revealed that zinc, sodium, and calcium ions can bind to tolaasin I and their binding position on tolaasin I is the lactone ring.