• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.2B
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• pp.130-137
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• 2012

In this paper, we propose core and edge router architectures with LPI(Low Power Idle) for reducing energy consumption in OBS networks. The proposed core router architecture is comprised of a BCP switch, a burst switch, line cards and sleep/wake controller for LPI. When the offered load of network is low, sleep/wake controller can change the state of the core router line card from active to sleep state for saving the energy after receiving network control packet. The edge router consists of a switch for access line card, a SCU and OBS edge router line cards. The LPI function in edge router line card is performed through network level control by network control packet, individually. Additionally, PHY/transceiver modules can transition active state to sleep state when burst assemble engine generates new bursts. To evaluate the energy saving performance of proposed architecture with LPI, the power consumption of each router is analyzed by using data sheet of commercial router and optical device. And, simulation is also performed in terms of sleep time of PHY/Transceiver through OPNET.

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.335.1-335.1
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• 2016

The electronic structures of a hybrid magnetic-electric quantum ring and two terminal conductance taking into account the resonant backscattering via both magnetic and electric edge channels are studied. The hybrid magnetic-electric quantum ring is formed by a magnetic quantum dot combined with an additional antidot electrostatic potential at the center of the dot. Electrons are both magnetically and electrically confined to the plane. The antidot potential repelling electrons from the center of the dot plays an important role in the energy spectra and magnetoconductance. The angular momentum transition in the ground state and the behavior of magnetoconductance due to a change of the antidot potential are shown in comparison with the conventional magnetic quantum dot.

• Korea-Australia Rheology Journal
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• v.15 no.3
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• pp.109-115
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• 2003

Rheometry testing and the DSC measurement of five thermotropic liquid crystalline polymers (TLCP) have been carried out. The dynamic viscosities of the five TLCPs show a typical shear-thinning behaviour obeying the power-law with the power indices from 0.2 to 0.3. When these TLCPs are heated above the melting temperatures determined by the DSC measurements, the dynamic viscosities first rapidly decrease by 2～3 orders of magnitude then level off, finally increase gradually with the further increasing of temperature. The steady shearing exhibited the same behaviour as the dynamic shearing, but serious edge fracture of material slippage out of the plates occurred. The abnormal temperature dependence of the viscosities can be explained by the nematic-isotropic transition. By using the concept of activation energy, we propose a simple model which can fit the shear-thinning behaviour quite well and predict qualitatively correct temperature effects.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2007.06a
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• pp.221-225
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• 2007

We have prepared $\delta$-phase SbTe alloy with various Sb contents of 64, 72, and 76 at. % and investigated the phase change temperature, the crystal structures of $\delta$-phase SbTe alloy, and determined the ovonic threshold switching voltages with edge contact type phase transition dimensions. As a result, the crystallization temperature is slightly reduced from 126 to $122^{\circ}C$, whereas the melting temperature is not changed. The ovonic threshold switching voltage is reduced from 1.6 to 0.9 V as increasing the Sb content from 64 to 76 at. %. It is found that the reductions of crystallization temperature and the ovonic threshold switching voltage are closely related with the interplanar spacing between adjacent atomic layers and the stacking number of atomic layers in a unit cell.

• Journal of the Korean Ceramic Society
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• v.32 no.6
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• pp.669-676
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• 1995

In this study, EO glass films were deposited by R.F. magnetron sputtering using EO glass target. The glass formation of the EO film was greatly dependent on the substrate temperature and the crystallization started at approximately 28$0^{\circ}C$. As the temperature of the substrate or the oxygen content in the sputtering gas increased, UV/VIS/NIR absorption edge moved toward longer wavelength. A wave guiding phenomenon was observed from the prism-coupler experiment and a fluorescence of 1.06${\mu}{\textrm}{m}$ originated from 4Fe3/2longrightarrow4I11/2 transition of Nd3+ was detected from the film containing Nd3+ ions.

• 한국정보디스플레이학회:학술대회논문집
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• 2003.07a
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• pp.1042-1044
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• 2003

The photoluminescence (PL) properties are studied for a new phosphor $BaZr(BO_{3})_{2}$ doped with $Eu^{3+}$ activator ion. The excitation spectrum shows strong absorption in the vacuum ultraviolet (VUV) region with an absorption band edge at 200 nm. The PL spectrum shows the strongest emission at 615 nm corresponding to the electric dipole $^{5}D_{0}\;{\rightarrow}\;^{7}F_{2}$ transition of $Eu^{3+}$, which results in a good color purity.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2003.11a
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• pp.366-370
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• 2003

This paper introduces a new design and fabrication technology of 28 GHz low-cost up and down converter modules for digital microwave radios, The design of the converter module is based on unit circuit blocks, which are to be characterized using a special test fixture. Based on the cascade analysis of the module the 28 GHz up and down converter modules have been designed and implemented. The measured module performance agrees with the cascade analysis. New components such as a tapped edge-coupled filter and a new Ka-band waveguide-to-microstrip transition, which are less sensitive to fabrication tolerances, have been used in the module implementation.

• Journal of Environmental Science International
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• v.12 no.1
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• pp.15-22
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• 2003

Fifteen major naturally populated habitats around the Mt. Halla, Jeju province for wild Cornus kousa are mostly located on the southeast side of the mountains at 850-1,550m in altitude at sea level and are in half sunney areas. More than 40.0% of the naturally populated area of Cornus kousa are edge of forest areas and 53.3% populate on the steep slope of the mountain in 0-5℃. The direction of the slop for about 40.0% of total populated areas is southeast. In the naturally populated areas, total of 64 taxa dividing into 42 families, 59 genera 56 species and 8 varieties have been shown, mostly Hydrangea petiolaris, Rubus oldhamii, Ilex crenata, Sasa quelpaertensis, Ligustrum obtusifolium. It is suggested that these areas are secondary forest in a typical deciduous forest in Mt. Halla where the second transition had been progressed after forest damage or environmental stress. The index of species diversity of plant groups in these areas is 1.286-4.238 based on the Shannon-Wiener's method.

• KIEE International Transactions on Electrophysics and Applications
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• v.4C no.6
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• pp.295-299
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• 2004

A new design technique of fabricating 40 GHz up-converter modules for digital microwave radios has been developed. The design of the up-converter module is based on unit circuit blocks, which are to be characterized using a special test fixture. The complete module design may be as simple as a cascade layout of these unit circuit blocks. Also, the 40 GHz up-converter module employs a new microstrip-to-waveguide transition and a tapped edge-coupled filter, which are less sensitive to fabrication tolerances.

• 한국초전도학회:학술대회논문집
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• v.12
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• pp.20-20
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• 2002