• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.61-61
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• 2009

P-type SGS-TFTs with 10 ${\mu}m$ channel length and two channel widths; $W_1=5{\mu}m$ and $W_2=10{\mu}m$ which has gate insulator made of 20nm $SiO_2$ and 80nm SiNx was fabricated and the electrical properties of them were measured. The field-effect mobility was increased from 95.84 to 104.19 $cm^2/V-s$ and threshold voltage also increased from -0.802 V to -0.954 V, when channel width is increased from5 ${\mu}m$ to 10 ${\mu}m$. Subthreshold swing decreased from 0.418 to 0.343 V/dec and $I_{on/off}$ ratio increased from $4.77{\times}10^7$ to $7.30{\times}10^7$.

• 전기전자학회논문지
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• 제20권3호
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• pp.330-332
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• 2016

본 연구에서는 8와 $100{\mu}m$의 채널 길이를 가지는 밴더블 a-Si:H 박막 트랜지스터를 제작하고, 밴딩 스트레인에 따른 전기적 특성변화를 측정하였다. 1.69%의 밴딩 스트레인에서 $8{\mu}m$ 채널 길이를 가지는 박막트랜지스터는 문턱 전압이 5.25 V까지 이동하였으나 $100{\mu}m$ 채널 길이를 가지는 박막트랜지스터는 전기적 특성 변화 없이 안정적으로 동작하였다.

• The Korean Journal of Physiology and Pharmacology
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• 제13권5호
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• pp.361-365
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• 2009

Effects of quercetin, a kind of flavonoids, on the vasodilating actions were investigated. Among the mechanisms for quercetin-induced vasodilatation in rat aorta, the involvement with the $Ca^{2+}$ activated $K^+$ ($K_{Ca}$) channel was examined. Pretreatment with NE ($5\;{\mu}M$) or KCl (60 mM) was carried out and then, the modulation by quercetin of the constriction was examined using rat aorta ring strips (3 mm) at $36.5^{\circ}C$. Quercetin (0.1 to $100\;{\mu}M$) relaxed the NE-induced vasoconstrictions in a concentrationdependent manner. NO synthesis (NOS) inhibitor, NG-monomethyl-L-arginine acetate (L-NMMA), at $100\;{\mu}M$ reduced the quercetin ($100\;{\mu}M$)-induced vasodilatation from $97.8{\pm}3.7%$ (n=10) to $78.0{\pm}11.6%$ (n=5, p<0.05). Another NOS inhibitor, L-NG-nitro arginine methyl ester (L-NAME), at $10\;{\mu}M$ also had the similar effect. In the presence of both $100\;{\mu}M$ L-NMMA and $10\;{\mu}M$ indomethacin, the quercetin-induced vasodilatation was further attenuated by $100\;{\mu}M$ tetraethylammonium (TEA, a $K_{Ca}$ channel inhibitor). Also TEA decreased the quercetin-induced vasodilatation in endothelium-denuded rat aorta. Used other $K_{Ca}$ channel inhibitors, the quercetin-induced vasodilatation was attenuated by $0.3\;{\mu}M$ apamin (a SK channel inhibitor), but not by 30 nM charybdotoxin (a BK and IK channel inhibitor). Quercetin caused a concentration-dependent vasodilatation, due to the endotheliumdependent and -independent actions. Also quercetin contributes to the vasodilatation selectively with SK channel on smooth muscle.

• 한국산학기술학회논문지
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• 제9권5호
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• pp.1172-1177
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• 2008

채널 선택용 필터의 전압오차를 보정하기 위해 전류비교 방식의 전압안정화 회로를 설계하였다. 제안된 전류비교 방식의 전압안정화 회로는 부속회로를 첨가 할 필요가 없어 칩 면적을 최소화 할 수 있고 저전압 저전력용 채널 선택용 필터 설계에 매우 유용하다. 제안된 안정화 회로의 응용 회로로써 블루투스 통신 시스템 채널을 포함한 3개의 통신채널을 이용하였다. $0.18{\mu}m$ CMOS 공정파라메터를 사용하여 HSPICE 시뮬레이션 한 결과, 제안된 안정화 회로는 3개의 통신 채널에서 각각 $12{\mu}s$, $13{\mu}s$, $15{\mu}s$이내에서 동작할 수 있음을 확인하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1873-1876
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• 2003

Magneto-rheological polishing is a new technology used in precision polishing. It utilizes magneto-rheological fluid. nonmagnetic polishing abrasive, aqueous carrier fluids in magnetic field to remove material from a part surface. Silicon micro channel as work piece is fixed in the slurry which is made of MR fluid and CeO$_2$(10 vol%) abrasive particles. And permanent magnet rotate in the slurry to transfers magnetic force to abrasive particles by increasing yield strength of MR fluid. so, the obtained bottom surface roughness of micro channel by experiment reduced to Ra 0.010 $\mu\textrm{m}$ Rmax 0.103 $\mu\textrm{m}$ and finwall surface roughness of micro channel reduced to Ra 0.018 $\mu\textrm{m}$ Rmax 0.468 $\mu\textrm{m}$. At optimum conditions of variables, the workpiece as silicon micro channel have about 24 times smaller surface roughness than before polishing.

• The Korean Journal of Physiology and Pharmacology
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• 제3권3호
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• pp.293-303
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• 1999

The influences of specific protein phosphatase and protein kinase inhibitors on the ATP-sensitive $K^+\;(K_{ATP})$ channel-opening effect of pinacidil were investigated in single rat ventricular myocytes using patch clamp technique. In cell-attached patches, pinacidil $(100\;{\mu}M)$ induced the opening of the $K_{ATP}$ channel, which was blocked by the pretreatment with H-7 $(100\;{\mu}M)$ whereas enhanced by the pretreatment with genistein $(30\;{\mu}M)$ or tyrphostin A23 $(10\;{\mu}M)$. In inside-out patches, pinacidil $(10\;{\mu}M)$ activated the $K_{ATP}$ channels in the presence of ATP (0.3 mM) or AMP-PNP (0.3 mM) and in a partial rundown state. The effect of pinacidil $(10\;{\mu}M)$ was not affected by the pretreatment with protein tyrosine phosphatase 1B $(PTP1B,\;10\;{\mu}g\;ml^{-1}),$ but blocked by the pretreatment of protein phosphatase 2A $(PP2A,\;1\;U\;ml^{-1})$. In addition, pinacidil $(10\;{\mu}M)$ could not induce the opening of the reactivated $K_{ATP}$ channels in the presence of H-7 $(100\;{\mu}M)$ but enhanced it in the presence of ATP (1 mM) and genistein $(30\;{\mu}M).$ These results indicate that the $K_{ATP}$ channel-opening effect of pinacidil is not mediated via phosphorylation of $K_{ATP}$ channel protein or associated protein, although it still requires the phosphorylation of serine/threonine residues as a prerequisite condition.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
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• pp.240.1-240.1
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• 2013

본 연구에서는 Symmetric NMOSFET의 channel length에 따른 전기적 특성 분석에 관한 연구를 진행하였다. 특성 분석에 사용된 소자의 Gate oxide 두께는 6 nm 이며, 채널 Width/Length는 각각 10/10 ${\mu}m$, 10/0.2 ${\mu}m$ 이다. Drain Avalanche Hot Carrier(DAHC) 테스트를 진행하기 위하여 각각 스트레스 조건을 추출하였고, 조건에 해당되는 스트레스를 1700초 동안 인가하였다. 스트레스 후, Channel length가 10 ${\mu}m$과 0.2 ${\mu}m$인 두 소자의 특성을 측정, 분석결과 10 ${\mu}m$의 소자의 경우 문턱전압(VT)과 Subthreshold swing (SS)의 변화가 없었지만 0.2 ${\mu}m$의 소자의 경우 0.42V의 (from 0.67V to 1.09V) 문턱전압 변화 (VTH)와 71 mV/dec (from 79 mV/dec to 150 mV/dec))의 Swing (SS)변화를 보여 스트레스 후에 Interface trap이 증가하였음을 알 수 있다. off-state leakage current를 측정 결과 0.2 ${\mu}m$ 의 경우 leakage current의 양이 증가하였음을 알 수 있고 이는 드레인 부근에 증가된 interface trap에 의한 현상으로 판단된다. 상기 결과와 같이 DAHC 스트레스에 의한 소자의 열화 현상은 Channel length가 짧을수록 더 크게 의존하는 것을 확인하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.1-4
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• 2002

The numerical alaysis of optical device, silicabased device, are presented. The purpose of this paper is to simulate and to design a 8-channel optical wavelength division multiplexer(OWDM) based on Mach-Zehnder Interferometer(MZI) with wavelength spacing between channels Δλ=0.8 nm at central wavelength λ=1.55 ${\mu}{\textrm}{m}$. In initial condition fur simulating, we assumed as follows. A channel waveguide is made from silica based P-doped SiO2 core layers in order to coupling with a fiber easily and its core dimension was 6 ${\mu}{\textrm}{m}$$\times$6 ${\mu}{\textrm}{m}$. The core and clad index of channel waveguide were 1.455 and 1.444, separately, at λ=1.55 ${\mu}{\textrm}{m}$. Where, the separation between channel waveguides in coupling region was 3 ${\mu}{\textrm}{m}$. As a result of analysis, a group mode index of channel waveguide was 1.4498370, was gained by Hermite-Gaussian Method(HGM). Also, the channel spacing was determined by the waveguide arm length difference and was Δλ=0.8 nm as like a proposed condition. The central wavelength of a designed-multiplexer was activated about wavelength λ=1.55 ${\mu}{\textrm}{m}$, and we certificated that it can be used to 8-channel optical wavelength division multiplexer/demultiplexer.

• The Korean Journal of Physiology and Pharmacology
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• 제12권2호
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• pp.73-77
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• 2008

Recent studies have documented that testosterone relaxes several smooth muscles by modulating $K^+$ channel activities. Smooth muscles of seminal vesicles playa fundamental role in ejaculation, which might involve testosterone. This study was aimed to assess the role of testosterone in seminal vesicular motility by studying its effects on contractile agents and on the ion channels of single vesicular myocytes in a rabbit model. The contractile responses of circular smooth muscle strips of rabbit seminal vesicles to norepinephrine ($10{\mu}M$), a high concentration of KCI (70 mM), and testosterone ($10{\mu}M$) were observed. Single vesicular myocytes of rabbit were isolated using proteolytic enzymes including collagenase and papain. Inside-out, attached, and whole-cell configurations were examined using the patch clamp technique. The applications of $10{\mu}M$ norepinephrine or 70 mM KCl induced tonic contractions, and $10{\mu}M$ testosterone (pharmacological concentration) evoked dose-dependent relaxations of these precontracted strips. Various $K^+$ channel blockers, such as tetraethylammonium (TEA; $10{\mu}M$), iberiotoxin ($0.1{\mu}M$), 4-aminopyridine (4-AP, $10{\mu}M$), or glibenclamide ($10{\mu}M$) rarely affected these relaxations. Single channel data (of inside-out and attached configurations) of BK channel activity were also hardly affected by testosterone ($10{\mu}M$). On the other hand, however, testosterone reduced L-type $Ca^{2+}$ currents significantly, and found to induce acute relaxation of seminal vesicular smooth muscle and this was mediated, at least in part, by $Ca^{2+}$ current inhibition in rabbit.

• 한국전기전자재료학회논문지
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• 제20권1호
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• pp.47-52
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• 2007

Organic field-effect transistors (OFETS) are of interest for use in widely area electronic applications. We fabricated a copper phthalocyanine (CuPc) based field-effect transistor with varying channel length. The CuPc FET device was made a top-contact type and the channel length was a $100\;{\mu}m,\;50\;{\mu}m,\;40\;{\mu}m,\;and\;30\;{\mu}m$ and the channel width was a fixed at 3 mm. We observed a typical current-voltage (I-V) characteristics in CuPc FET with varying channel length (L) and we calculated the effective mobility. Also, we measured a capacitance-voltage (C-V) by applied bias voltage with varying frequency at 43, 100, 1000 Hz.