• Proceedings of the KAIS Fall Conference
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• 2005.05a
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• pp.122-124
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• 2005

이극형 이온펌프에서의 내부 전극 구조의 문제점과 고전압에서의 방전특성을 고려하여 삼극형 이온펌프에서 -lkV $\~$ -7kV까지 고전압을 변화시킴에 따라 진공도가 $5.0{\times}10^{-5}Torr {\~} 4.7{\times}10^{-8}Torr$ 까지 형성되었다. 그 결과 시간에 따른 진공도 또한 약 27분 정도 소요됨을 알 수 있으며, 전류값은 -1kV$\~$-2kV에서는 선형적으로 증가하다 -3kV이상부터 지수적으로 증가함을 볼 수 있다. 따라서 삼극형 이온펌프는 이극형 이온펌프 보다 고전압 방전 특성 및 내부 전극 구조의 문제점이 개선되었다.

• Proceedings of the KAIS Fall Conference
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• 2005.05a
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• pp.119-121
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• 2005

반도체 및 디스플레이 제조에 필요한 진공펌프의 장$\cdot$단점을 비교하고, 특히 2극형 이온펌프와 3극형 이온펌프의 구조를 비교하였다. 고압시스템과 3극형 이온펌프를 설계, 제작하여 전류-전압 특성을 비교하였다. 고압시스템을 이온펌프에 결합하여 측정한 결과 펌프 내부 저항과 챔버 내의 저항, 그리고 펌프내에서 전자의 방출 등에 따른 이유로 전류의 값이 변화되는 것을 알 수 있었다.

• ETRI Journal
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• v.28 no.2
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• pp.175-181
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• 2006

A new CMOS voltage-controlled fully-differential transconductor is presented. The basic structure of the proposed transconductor is based on a four-MOS transistor cell operating in the triode or saturation region. It achieves a high linearity range of ${\pm}\;1\;V$ at a 1.5 V supply voltage. The proposed transconductor is used to realize a new fully-differential Gm-C low-pass filter with a minimum number of transconductors and grounded capacitors. PSpice simulation results for the transconductor circuit and its filter application indicating the linearity range and verifying the analytical results using $0.35\;{\mu}m$ technology are also given.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.971-972
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• 2006

We have demonstrated Carbon Nanotube Back Light Unit (CNT-BLU) which has a triode structure. Local dimming scheme was introduced to the BLU driving system. With this driving method, contrast ratio enhanced 20 times higher than that of conventional Cold Cathode Fluorescent Lamp (CCFL) BLU.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.486-489
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• 2007

Carbon nanotube (CNT) cathodes having a trench structure similar to the structure of the gated triodetype cathode were successfully fabricated by a screenprinting method with multi-walled carbon nanotubes. We observed that a liquid method not only readily removes the organic residues on the CNT films, but also satisfactorily protrudes the CNTs out of the electrode surface. The CNT cathodes prepared by the liquid method showed a turned-on field of $1.4\;V/{\mu}m$. The emission current density of them was about $3.1\;mA/cm^2$ at the electric field of $3\; V/{\mu}m$. The liquid method appears to be a promising surface treatment of CNT cathode for gated triode-type FEDs applications.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.16 no.6
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• pp.163-167
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• 2007

A field emission electron gun including 3 electrodes including one cathode and two anodes is very important for high resolution electron microscope. To have functions to control the initially-emitted electron beam, two anodes act as an electrostatic lens according to equipotential lines by adjusting the spot size, intensity, and working distance. To verify the action of the electron beam by the electrostatic lens by changing several parameters such as electrode shape, displacement and applied voltage to the electrodes, the two lenses were design and simulated and then their performances were analyzed with angular beam intensity(distribution), electrical optic axis variation and their stability.

• Nuclear Engineering and Technology
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• v.38 no.8
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• pp.779-784
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• 2006

The design, manufacturing process, and first operating test of a high power RF source for a proton accelerator are described. A klystron amplifier system has been developed for operation at 700 MHz, 1 MW and is composed of a triode type electron gun, six cavities, an RF output window, a beam collector, and an electromagnet. The prototype klystron was constructed and tested at a reduced duty to produce the designed output RF power.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.11a
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• pp.476-479
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• 2000

In this study, mesh-type PECVD system was suggested to minimize the hydrogen concentration. The main structural difference between the triode system and a conventional system is that a mesh was attached to the substrate holding electrode. We investigated several conditions to compare with conventional PECVD. The main effect of mesh was to minimize the substrate damage by ion bombardment and to enhance the surface reaction to induce hydrogen desorption. It was also found that hydrogen concentration decreased but deposition rate increased as increasing applied dias. Applied DC bias enhanced sputtering process. Intense ion bombardment causes the weakly bonded hydrogen or hydrogen-containing species to leave the growing film and increased adatom mobility. Furthermore, addition of hydrogen gas enhance the surface diffusion of adatom. The structural properties of poly-Si films were analyzed by scanning electron microscopy(SEM).

• Proceedings of the KIEE Conference
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• 2003.07c
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• pp.1662-1664
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• 2003

An electron gun system for a nanosecond pulse linac has been built and tested. The gun grid is driven with a grid pulser, which consists of an avalanche transistor pulser and parallel triode amplifier. The amplifier is installed in an end hole of the electron gun and provided for power amplification and polarity change of the output pulses of the avalanche transistor pulser. An output pulse of 200 V and 2 ns FWHM was obtained by using the grid pulser of can type transistors. Measurements with a test bench show that the electron gun can deliver 2ns pulse with with currents larger than 3A.

• Proceedings of the KIEE Conference
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• 1994.11a
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• pp.243-245
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• 1994

We synthesized the conducting diamond-like carbon films using plasma-enhanced chemical vapor deposition and analysized its characteristics. We obtained the metal-containing diamond-like carbon films using $CH_4$, Ar gas and aluminum target. We observed the changes of electrical conductivity, microhardness and surface morphology according to $Ar/CH_4$ ratio, substrate bias and target bias. As the target bias and $Ar/CH_4$ ratio increase and the substrate bias decreases, the electrical conductivity and surface roughness increase. The increase of hardness involves decrease of the electrical conductivity. Metal-containing amorphous hydrogenated carbon films show improved adhesion on metal substrates compared to pure diamond-like carbon films and better electrical conductivity.