• KIEE International Transactions on Electrophysics and Applications
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• v.3C no.6
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• pp.230-235
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• 2003

In this paper, a superposed discharge type ozonizer with an internal dielectric that can be made into a vacuum tube has been designed and fabricated. Ozone generation and discharge characteristics have been investigated in accordance with output voltage of power supply, flow-rate, discharge power and vacuum of inside internal dielectric. Pure oxygen was used as the supply gas of the ozonizer. Ozone concentration and ozone generation are gradually increased when discharge power is increased at the same flow-rate and they are both proportional to the vacuum level. As such, the maximum ozone concentration of 8840 ppm was obtained at vacuum 0.1 Torr and flow-rate 0.5 $\ell$/min.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.199.1-199.1
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• 2014

In nonlinear optics, the properties of nonlinear optical responses such as polarization and nonlinear analysis of the nonlinear surfaces were investigated using the jellium model by optical second harmonic generation. The nonlinear response of the Al metal surfaces were calculated using TDLDA. Band structure, lattice constant and bulk modulus of the Al metal were investigated. Effective potential and electron density were compared by changing different.

• Vacuum Magazine
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• v.4 no.4
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• pp.14-17
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• 2017

Recently, quantum-dots light emitting diodes (QLEDs) are considered as a next-generation display due to the superior luminescence behaviors, photo stability and narrow spectral emission bandwidth. Moreover, the emission color of QLEDs can be easily controlled by changing the dimension of quantum dots (QDs). A flexible display based on QLEDs can be achieved using low-cost solution process, such as a printing technology. Therefore, QLEDs are expected as a next generation display. In this document, recent progresses in QDs technology will be introduced.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.162.1-162.1
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• 2010

Cavitation phenomenon has long been a difficult problem that regarded as negative event to fluid machines or industrial facilities. In the latest, however, some engineers became to understand the power of cavitation and use it to cleaning wall after developing cavitation nozzle. In this paper, we introduce new concept for power-generation system using cavitation jet flow maid by nozzle and impulse turbine in vacuum condition. The vacuum needed to make cavitation is generated naturally by Torricelli's vacuum, 10.23m effective head drop without additional power. We analyzed water's boiling and the steam's mean free path according to vacuum purity levels for nozzles and turbine blades. The nozzles make water accelerate in the neck and boil in expansion section of the nozzles. The shape of the impulse turbine is designed for absorption of the molecule's kinetic energy of the steam.

• Proceedings of the Korean Vacuum Society Conference
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• 2009.08a
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• pp.326-326
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• 2009

• Proceedings of the Korean Vacuum Society Conference
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• 2006.02a
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• pp.101-101
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• 2006

• Proceedings of the Korean Vacuum Society Conference
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• 2006.02a
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• pp.225-225
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• 2006

• Proceedings of the Korean Vacuum Society Conference
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• 2008.02a
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• pp.265-265
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• 2008

• Proceedings of the Korean Vacuum Society Conference
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• 1999.02a
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• pp.172-172
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• 1999

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.299-302
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• 2002

Vacuum microelectronics has been expected to provide a number of advanced devices such as flat panel displays, high-frequency devices etc., and rapidly showing tremendous and attractive aspects toward nanotechnology. Nowadays, nanomachining and nanomaterials are coming to new targets in the development for new generation devices. Transfer Mold technique has been developed for the vacuum nanotechnology. Carbon nanotubes (CNTs) are emerging as nanomaterials and expecting the new electron sources for FED. Recent progress of vacuum microelectronics toward vacuum nanotechnology in Japan are described.