Bioinspired Multifunctional Superhydrophobic Surfaces with Carbon-Nanotube-Based Conducting Pastes by Facile and Scalable Printing

Han, Joong Tark,Kim, Byung Kuk,Woo, Jong Seok,Jang, Jeong In,Cho, Joon Young,Jeong, Hee Jin,Jeong, Seung Yol,Seo, Seon Hee,Lee, Geon-Woong American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.8

<P>Directly printed superhydrophobic surfaces containing conducting nanomaterials can be used for a wide range of applications in terms of nonwetting, anisotropic wetting, and electrical conductivity. Here, we demonstrated that direct-printable and flexible superhydrophobic surfaces were fabricated on flexible substrates via with an ultrafacile and scalable screen printing with carbon nanotube (CNT)-based conducting pastes. A polydimethylsiloxane (PDMS)-polyethylene glycol (PEG) copolymer was used as an additive for conducting pastes to realize the printability of the conducting paste as well as the hydrophobicity of the printed surface. The screen-printed conducting surfaces showed a high water contact angle (WCA) (>150) and low contact angle hysteresis (WCA < 5) at 25 wt % PDMS-PEG copolymer in the paste, and they have an electrical conductivity of over 1000 S Patterned superhydrophobic surfaces also showed sticky superhydrophobic characteristics and were used to transport water droplets. Moreover, fabricated films on metal meshes were used for an oil/water separation filter, and liquid evaporation behavior was investigated on the superhydrophobic and conductive thin-film heaters by applying direct current voltage to the film.</P>

D-Amphetamine Causes Dual Actions on Catecholamine Release from the Rat Adrenal Medulla

Geon-Han Lim,Gwang-Moon Na,Seon-Young Min,Yoo-Seok Seo,Chan-Won Park,Dong-Yoon Lim 대한생리학회-대한약리학회 2005 The Korean Journal of Physiology & Pharmacology Vol.9 No.1

The present study was designed to examine the effect of d-amphetamine on CA release from the isolated perfused model of the rat adrenal gland, and to establish its mechanism of action. D- amphetamine (10∼100μM), when perfused into an adrenal vein of the rat adrenal gland for 60 min, enhanced the CA secretory responses evoked by ACh (5.32⁓10<SUP>⁣3</SUP> M), excess K<SUP>⁢</SUP> (5.6⁓10<SUP>⁣2</SUP> M, a membrane depolarizer), DMPP (10<SUP>⁣4 </SUP>M, a selective neuronal nicotinic N<SUB>n</SUB>-receptor agonist) and McN-A-343 (10<SUP>⁣4 </SUP>M, a selective M<SUB>1</SUB>-muscarinic agonist) only for the first period (4 min), although it alone has weak effect on CA secretion. Moreover, d-amphetamine (30μM) in to an adrenal vein for 60 min also augmented the CA release evoked by BAY-K-8644, an activator of the dihydropyridine L-type Ca<SUP>2⁢</SUP> channels, and cyclopiazonic acid, an inhibitor of cytoplasmic Ca<SUP>2⁢</SUP> ATPase only for the first period (4 min). However, in the presence of high concentration (500μM), d-amphetamine rather inhibited the CA secretory responses evoked by the above all of secretagogues. Collectively, these experimental results suggest that d-amphetamine at low concentrations enhances the CA secretion from the rat adrenal medulla evoked by cholinergic stimulation (both nicotininc and muscarinic receptors) as well as by membrane depolarization, but at high concentration it rather inhibits them. It seems that d-amphetamine has dual effects as both agonist and antagonist at nicotinic receptors of the isolated perfused rat adrenal medulla, which might be dependent on the concentration. It is also thought that these actions of d-amphetamine are probably relevant to the Ca<SUP>2⁢</SUP> mobilization through the dihydropyridine L-type Ca<SUP>2⁢</SUP> channels located on the rat adrenomedullary chromaffin cell membrane and the release of Ca<SUP>2⁢</SUP> from the cytoplasmic store.

Deep feature learning for person re-identification in a large-scale crowdsourced environment

Oh, Seon Ho,Han, Seung-Wan,Choi, Bum-Suk,Kim, Geon-Woo,Lim, Kyung-Soo Springer-Verlag 2018 The Journal of supercomputing Vol.74 No.12

집중형 수문모형과 분포형 수문모형의 유출 및 홍수범람 비교

Kim, Geon Tae,Seon Jeong Kim,Jong Hyeok Jeong,Sang-Ok Han 한국기상학회 2013 한국기상학회 학술대회 논문집 Vol.2013 No.4

D-Amphetamine Causes Dual Actions on Catecholamine Release from the Rat Adrenal Medulla

Lim, Geon-Han,Na, Gwang-Moon,Min, Seon-Young,Seo, Yoo-Seok,Park, Chan-Won,Lim, Dong-Yoon The Korean Society of Pharmacology 2005 The Korean Journal of Physiology & Pharmacology Vol.9 No.1

The present study was designed to examine the effect of d-amphetamine on CA release from the isolated perfused model of the rat adrenal gland, and to establish its mechanism of action. Damphetamine $(10{\sim}100{\mu}M$), when perfused into an adrenal vein of the rat adrenal gland for 60 min, enhanced the CA secretory responses evoked by ACh ($5.32{\times}10^{-3}$ M), excess $K^+$ ($5.6{\times}10^{-2}$ M, a membrane depolarizer), DMPP ($10^{-4}$ M, a selective neuronal nicotinic $N_n-receptor$ agonist) and McN-A-343 ($10^{-4}$ M, a selective $M_1-muscarinic$ agonist) only for the first period (4 min), although it alone has weak effect on CA secretion. Moreover, d-amphetamine ($30{\mu}M$) in to an adrenal vein for 60 min also augmented the CA release evoked by BAY-K-8644, an activator of the dihydropyridine L-type $Ca^{2+}$ channels, and cyclopiazonic acid, an inhibitor of cytoplasmic $Ca^{2+}$ ATPase only for the first period (4 min). However, in the presence of high concentration ($500{\mu}M$), d-amphetamine rather inhibited the CA secretory responses evoked by the above all of secretagogues. Collectively, these experimental results suggest that d-amphetamine at low concentrations enhances the CA secretion from the rat adrenal medulla evoked by cholinergic stimulation (both nicotininc and muscarinic receptors) as well as by membrane depolarization, but at high concentration it rather inhibits them. It seems that d-amphetamine has dual effects as both agonist and antagonist at nicotinic receptors of the isolated perfused rat adrenal medulla, which might be dependent on the concentration. It is also thought that these actions of d-amphetamine are probably relevant to the $Ca^{2+}$ mobilization through the dihydropyridine L-type $Ca^{2+}$ cha$N_n$els located on the rat adrenomedullary chromaffin cell membrane and the release of $Ca^{2+}$ from the cytoplasmic store.

방과 후 뉴 스포츠 운동이 비만과 일반 여중생의 혈중지질 및 SOD, MDA에 미치는 영향

한건(Geon Han),황예선(Ye Seon Hwang),박견우(Kyeun Woo Park),오수일(Su Ill Oh) 한국체육교육학회 2010 한국체육교육학회지 Vol.15 No.1

본 연구는 12주 간의 뉴 스포츠 운동이 신체구성, 혈중지질, SOD, MDA에 어떠한 영향을 미치는지 알아보는데 목적잉 있다. 연구 대상자들은 22명의 여자 중학생들로 10명은 비만 그룹, 12명은 일반 그룹으로 구성하였다. 12주 후, 신체구성에서 비만 여중생그룹에서 체지방률의 유의한 감소를 나타냈다. 혈중지질에서는 일반 여중생 그룹에서 HDL-C의 유의한 증가와 TC/HDL-C, LDL-C/ HDL-C의 유의한 감소를 나타냈으며, 비만 여중생 그룹에서는 TC/HDL-C의 유의한 감소를 나타냈다. SOD는 일반 여중생 그룹에서 유의한 감소를 나타냈다. 이에 12주간의 뉴 스포츠 운동의 실시가 일반 여중생의 SOD에는 긍정적인 영향을 미치지 못했으나 혈중지질에는 긍정적인 효과가 있는 것으로 나타났으며, 비만 여중생에게 있어서는 체지방 감소에 효과적인 것으로 나타났다. 따라서 규칙적인 신체활동에 적극적이지 못한 여중생들에게 뉴 스포츠 운동의 실시가 신체구성 및 혈중지질의 개선에 긍정적인 영향을 미치는 것을 알 수 있었다. The Purpose of this study was effects of new sports exercise for 12 weeks on body composition, blood lipid, SOD and MDA. Subjects were 22(obese group; 10, normal group; 12) middle school girl`s. After 12 weeks, obese group showed significantly decrease in %fat. Blood lipid showed significantly increase in HDL-C and significantly decrease in TC/HDL-C, LDL-C/HDL-C of normal group. And obese group showed significantly decrease in TC/HDL-C. SOD showed significantly decrease in normal group, MDA showed no significantly decrease all group.

Efficient Low-Temperature Transparent Electrocatalytic Layers Based on Graphene Oxide Nanosheets for Dye-Sensitized Solar Cells

Seo, Seon Hee,Jeong, Eun Ji,Han, Joong Tark,Kang, Hyon Chol,Cha, Seung I.,Lee, Dong Yoon,Lee, Geon-Woong American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.20

<P>Electrocatalytic materials with a porous structure have been fabricated on glass substrates, via high-temperature fabrication, for application as alternatives to platinum in dye-sensitized solar cells (DSCs). Efficient, nonporous, nanometer-thick electrocatalytic layers based on graphene oxide (GO) nanosheets were prepared on plastic substrates using electrochemical control at low temperatures of ≤100 °C. Single-layer, oxygen-rich GO nanosheets prepared on indium tin oxide (ITO) substrates were electrochemically deoxygenated in acidic medium within a narrow scan range in order to obtain marginally reduced GO at minimum expense of the oxygen groups. The resulting electrochemically reduced GO (E-RGO) had a high density of residual alcohol groups with high electrocatalytic activity toward the positively charged cobalt-complex redox mediators used in DSCs. The ultrathin, alcohol-rich E-RGO layer on ITO-coated poly(ethylene terephthalate) was successfully applied as a lightweight, low-temperature counter electrode with an extremely high optical transmittance of ∼97.7% at 550 nm. A cobalt(II/III)-mediated DSC employing the highly transparent, alcohol-rich E-RGO electrode exhibited a photovoltaic power conversion efficiency of 5.07%. This is superior to that obtained with conventionally reduced GO using hydrazine (3.94%) and even similar to that obtained with platinum (5.10%). This is the first report of a highly transparent planar electrocatalytic layer based on carbonaceous materials fabricated on ITO plastics for application in DSCs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-20/acsami.5b01938/production/images/medium/am-2015-01938y_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b01938'>ACS Electronic Supporting Info</A></P>

한국인 상염색체 우성 다낭신 가계에서의 유전자 아형분석

이중건,안규리,황대연,황영환,어현선,채회진,이은주,조종태,김연수,한진석,김성권,이정상 대한신장학회 2000 대한신장학회잡지 Vol.19 No.4

Mo-실리사이드 형성 메카니즘에 관한 연구 : Ⅱ. 表面 Morphology와 電氣的 特性 Ⅱ. Surface Morphologies and Electrical Properties

박종윤,한전건,이상균,김기선 성균관대학교 기초과학연구소 1992 論文集 Vol.43 No.2

Mo-disilicide 박막은 n-Si(100) 기판위에 전자선 증착과 이어지는 진공 또는 질소 분위기에서 급속 열처리(RTA : Rapid Thermal Annealing) 장치에 의한 열적 확산(thermal diffusion)법에 의해서 만들어졌다. 이들 박막의 화학적 조성과 morphology는 XRD, AED(ADP), TEM, NOM에 의해서 분리되어졌다. Mo/Si계의 안정된 최종상은 tetragonal-MoSi₂였고, 표면 morphology와 grain size는 상호 의존하며 열처리 온도에 따하서 크기가 증가되었다. 상온에서 증착한 박막에서는 계면에서 얇은 SiO_2 층이 보였고 이 층의 존재로 Si의 확산이 억제됨을 확인하였으며, 기판온도를 400℃로 유지하며 pre-annealing을 120분 동안 부여한 시료에서는 Mo-silicide가 columnar 구조로 성장됨이 보였다. 그리고, 전기적 특성은 sheet 저항과 Schotty 장벽높이가 조사되었는데, 열처리 온도 증가에 따라 감소하는 sheet저항은 grain size에 의존하며, 최저치는 700℃에서 1분 동안 열처리 한 시료의 값인 2.1Ω/□으로 열처리 온도 증가에 대해 더 이상 변화하지 않는 최종적인 값이다. 그러나 Schotty barrier height는 0.56eV로 열처리 온도, 분위기에 따라 변화하지 않으며 hexagonal-과 tetragonal-MoSi₂둘 모두에서 같았다. Molybdenum disilicide films have been prepared onto n-Si(100) substrates with electron-beam deposition and sequently post-annealing by rapid thermal annealing in the ambient of N₂ or vacuum. The chemical compositions and morphology of films were analyzed by XRD, ADP, TEM, and NOM methods. We confirm that the stable phase of Mo/Si system is tetragonal-MoSi₂ phase, and the surface morphology and grain size were depended upon the annealing temperature. There are SiO₂ layers at the interface of MoSi₂ film evaporated at room temperature and the thermal diffusion of Si was interrupted by the layers. However, the thin films with the substrate temperature of 400℃ have growned to the MoSi₂ with columnar structure. We measured the electrical properties, the sheet resistance and Schottky barrier height, of MoSi₂ thin films. The sheet resistance was depended upon the grain size and the smallest value was 2.1Ω/□ at room temperature after annealing at 700℃ for 1 min. The Schottky barrier height was independed upon the annealing temperature and ambient, and was about 0.56eV for hexagonal- and tetragonal-MoSi₂.

약용작물 고품질 다수성 삽주 신품종 "고출" 개발

박춘근(Chun-Geon Park),이정훈(Jeong-Hoon Lee),김옥태(OK-Tae Kim),박충범(Chung-Berm Park),김금숙(Geum-Soog Kim),안영섭(Young-Sup Ahn),차선우(Seon-Woo Cha),이상훈(Sang-Hoon Lee),한승호(Han-Seung Ho),김종수(Jong-Soo Kim),정은호(Eun-Ho J 한국약용작물학회 2014 한국약용작물학회 학술대회논문집 Vol.2014 No.2