• Proceedings of the KSME Conference
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• 2000.11b
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• pp.514-519
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• 2000

Predicting a pressure drop between inlet and outlet of the filter system is essential in designing the optimum filter system. This experiment has been carried out to investigate several design parameters which influence in a pressure drop, such as different tube length and metal fiber filter mesh size. A 1/50 scale filter system was made to simulate a real filter system. Results are compared with Darcy equation for a porous media.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2008.10a
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• pp.205-207
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• 2008

• Proceedings of the Korean Ceranic Society Conference
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• 2002.10a
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• pp.54.1-54
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• 2002

• Proceedings of the Optical Society of Korea Conference
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• 2006.07a
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• pp.45-46
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• 2006

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.1785-1786
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• 2006

본 논문에서 개발한 시스템은 원자력 발전소의 금속파편감시계통(Loose parts monitoring system, LPMS)에서 충격신호의 탐지를 위해 사용되는 하드웨어와 관련이 있는 트리거 판단을 위한 보드이다. LPMS는 원자로 내부에서 발생하는 금속 파편이나 이물질의 존재 여부와 위치를 정확히 찾아내 원자력 발전소의 불필요한 가동중단이나 예기치 않은 안전 사고를 예방 할 수 있는 시스템이다. 본 논문에서 개발한 DAM(Data acquisition module)보드는 LPMS의 하드웨어 중에서 입력된 신호를 디지털로 변환하여 충격신호의 트리거 여부를 판단하는 기능을 한다. DAM은 디지털 필터와 트리거 판단을 위한 알고리즘이 DSP에서 실시간으로 처리되어 DMS의 기능을 업그레이드 하였다. 개발된 시스템은 기존 외국 장비에 비하여 하드웨어 성능이 대폭 향상되었으며 하드웨어의 완전 국산화 개발이라는 특징이 있다.

• Journal of the Korean Institute of Gas
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• v.2 no.1
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• pp.47-52
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• 1998

To eliminate foreign substance like metal rust and sand in natural gas pipeline, 250um strainer filter is used present in Korea Gas Corporation. But particles smaller than 250um passing the filter have bad effects to the valves and the measuring equipments. In order to eliminate small paticle in the pipeline, it is necessary to cut down the pore size of filter When we cut down the pore size of filter, the pressure difference between the front of filter and that of the rear part is increasing and disturb normal condition of gas supply. So it is very important to control the condition between the pore size of filter and the pressure difference. In this study, using head loss coefficient K, the estimation method of efficiency of gas filter according to the pore size and the pressure difference is presented.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.06a
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• pp.337-337
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• 2009

가시광선영역에서 매우 균일한 높은 투과성뿐만 아니라 근적외선영역에서 가파른 홉수성 엣지와 함께 낮은 투과율을 제공하는 산화구리(II)를 함유하는 포스페이트 유리는 컬러 비디오 카메라의 컬러 보정 필터, 발광 컬러 디스플레이용 보호판(sheild), 모노크로메이터의 미광 필터, 플라스틱 복합재 필터의 무기 성분 및 CCD(전하 결합 소자) 및 CMOS(상보성 금속 산화물 반도체) 카메라 및 검출기 분야용 필터 유리로서 사용된다. 용융온도 및 산화구리(II) 첨가량에 따른 투과율을 측정하기 위해 포스페이트 유리 시료를 $1100\sim1500^{\circ}C$ 용융한 후 $400^{\circ}C$에서 2시간 동안 어닐링 공정을 거쳐 제조하였다. 제조된 시료는 두께 0.3mm로 폴리싱하여 자외선-적외선 분광 광도기를 이용하여 광학적 특성을 측정하였다. 본 실험을 통하여 용융온도에 따라 가시광선영역 및 근적외선영역에서의 투과율 거동을 비교한 결과 $1100\sim1200^{\circ}C$에서의 우수한 투과율 특성을 나타냈다. 용융온도가 내려감에 따른 가시광선영역 (400~600nm)에서 높은 투과율 및 근적외선영역 (750~1100nm)에서 낮은 투과율과 가파른 흡수성 엣지를 나타냈다.

• Journal of Navigation and Port Research
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• v.31 no.10
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• pp.833-837
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• 2007

In this study, we have fabricated a gain flattened erbium-doped optical fiber amplifier. Gain flattening filters were realized by the strain-induced long period fiber gratings, which are made of periodically arrayed metal wires. Using the filter of $550{\mu}m$ period, spontaneous emission amplified at C-band wavelength by a 980nm pumping laser was flattened within 1dB of gain ripple. The performance of the simultaneous multi channel amplification was measured using a fabry-perot laser diode. Amplification ratio was above 20dB. This amplifier can be applied to the long distance transmission system based on a wavelength division multiplexing for boosting an attenuated signal.

• Membrane Journal
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• v.32 no.1
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• pp.66-73
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• 2022

In this study, a method for stabilizing treated water was conducted while maintaining high flux using a metal flat membrane module made of stainless steel. This module had a pore size of 13 ㎛, so it was possible to operate at a high flux from 60 LMH to 100 LMH. However, although SS leaked about 30~50 ppm during initial operation, aggregation was possible because SS acted as aggregation nucleus. While polymer membrane permeate does not have aggregation nucleus, so coagulation is possible but not flocculation. Typically clay or bentonite, which is used as aggregation nucleus, is additionally administered. In this study, the total phosphorus treatment and the quality of the treated water were to promote stability because flocculation was achieved only with SS leakage without the need for such a aggregation nucleus. Finally, the feasibility of operating a metal membrane filter capable of high flux in stable treated water to be applied to the MBR system.

• Journal of the Korean Vacuum Society
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• v.12 no.1
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• pp.64-69
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• 2003

Using a high fewer electron beam gun (max. power 20 kW), Gadolinium (Gd, atomic number 64) metal was melted and the temperature distribution of melted surface was measured. With proper optical filters and the adjustment of aperture of lens, the radiation of melted surface was received by a ccd camera and its signal transferred to a computer. The real time monitoring of melted surface with a variation of electron beam Power was Possible and stable operation of electron beam was achieved. It was found that the max. temperature measured by a ccd camera with an assumption of blackbody radiation of melted Gd surface and adaption of Planet's law was above 100~$200^{\circ}C$ compared to that measured by a pyrometer in the same e-beam power.