• ETRI Journal
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• v.3 no.4
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• pp.25-30
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• 1981

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.12
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• pp.2662-2670
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• 2009

The effect of the reflector type for the SAW filter on the characteristics of the slanted finger IDT filter have been studied by computer simulation. The IDT was evaporated by Aluminum-Copper alloy. The design condition was optimized by the phase shift of the SAWfilter for WCDMA. We have employed that the number of pairs of the input and output IDT are 50 pairs and the thickness are $5,000{\AA}$, and the width and the space of reflector are $3.6{\mu}m$ and $2.0{\mu}m$, respectively. Frequency response of the fabricated SFIT filter has the property that the center frequency is about 190MHz and bandwidth at the 3dB is probably 8.2MHz. And we could obtain that the return loss is less then 16dB, the ripple characteristics is probably 4dB and the triple transit echo is less then 18dB after when we have matched impedance.

• Korean Chemical Engineering Research
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• v.50 no.6
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• pp.952-959
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• 2012

The photocatalytic reactor was designed to have improved efficiency by enhancing a light intensity of photocatalytic reactor using a reflector coated on the surface at the outer radius of annular shaped photocatalytic reactor. The improved photocatalytic reactor performed to treat waste air containing malodor and VOC with the enhanced light intensity, of which the effect on their removal efficiency was investigated. The intensities of illumination of the improved photocatalytic reactor filled with porous silica-based media and nonporous glass bead media carrying photocatalyst were observed to increase by 28.5% and 30.1%, respectively, compared to those of photocatalytic reactor without any reflector. Using the improved photocatalytic reactor filled with porous silica-based media and nonporous glass bead media carrying photocatalyst, the removal efficiencies were enhanced by 2~3% and insignificantly, respectively. The removal efficiencies of the optimized photocatalytic reactor with reflectors, filled with porous silica-based media carrying photocatalyst, were observed to increase by 26% and 60%, compared to those of photocatalytic reactor (i.e., 19% and 53%), without any reflector, filled with nonporous glass bead media carrying photocatalyst, for hydrogen sulfide and toluene, respectively. The roughness of used reflector surface was measured to be ca. four times as big as that of a commercial mirror. However, their removal efficiencies are expected to be enhanced by increasing an light intensity resulting from lowering the roughness of used reflector coated on the improved photocatalytic reactor in the future.

• Proceedings of the Optical Society of Korea Conference
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• 2009.02a
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• pp.289-290
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• 2009

• Proceedings of the Optical Society of Korea Conference
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• 2009.10a
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• pp.388-389
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• 2009

• Proceedings of the Optical Society of Korea Conference
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• 2008.07a
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• pp.263-264
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• 2008

• Proceedings of the Optical Society of Korea Conference
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• 2008.07a
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• pp.423-424
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• 2008

• Proceedings of the Optical Society of Korea Conference
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• 2008.07a
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• pp.327-328
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• 2008

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.109-112
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• 2000

본 논문은 마이크로머시닝 기술을 이용한 밀리미터파 대역의 공진기 설계를 제시한다. 밀리미터파 대역에서 3D 설계 tool인. HP HFSS ver. 5.5를 사용하였다. One-port cavity 공진기는 공진 주파수가 39.34 GHz., 반사 손실은 14.5 dB, 그리고, loaded Q (Q$_1$)는 150 을 보인다. Two-port cavity 공진기의 경우, 공진 주파수는 39GHz이고, 삽입 손실과 반사 손실은 각각 4.6 dB 와 19.8 dB. 그리고 loaded Q와 unloaded Q는 각각 44.3과 107로 측정되었다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.06a
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• pp.191-196
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• 2000

본 논문에서는 공조용 소음기에 대한 삽입손실 및 압력손실과 같은 음향성능 평가를 위해 필요한 제반 사항을 ISO 7235에 근거하여 소개하였다. 이를 위해 시험설비의 종류 및 구비조건, 측정방법, 측정시 유의사항 등을 기술하였고, 이로서 공조용 소음기의 보다 정확한 음향성능평가가 이루어지도록 검토 하였다.