• 한국전기전자재료학회논문지
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• 제20권5호
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• pp.415-420
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• 2007

Generally, a diode package consists of the synthetic resin that has good durability but low thermal conductivity. The surface mounted type fast recovery diode was fabricated by using ceramic package. Its main manufacture processes are composed of soldering, sillicon coating and side termination. And it has various advantages that diode is small, easy manufacture and fast cooling. The electric characteristics of the diode such as reverse recovery time, breakdown voltage, forward voltage, and leakage current were 5.28 ns, 1322 V, 1.08 V, $0.45\;{\mu}A$, respectively.

• 전자공학회논문지SC
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• 제43권4호
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• pp.45-52
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• 2006

본 연구에서는 위상잡음과 지터(jitter) 특성을 개선한 $5mm{\times}7mm$ 크기의 적층 세라믹 SMD(surface mounted device)형 VCXO를 개발한다. PECL(positive emitter coupled logic) 칩패키지를 발진수정자에 결선한 VCXO는 그 길이 및 패키지 내부의 패턴 등에 의하여 부유인덕턴스 및 기생 커패시턴스가 발생하고, 전원의 반사 및 잡음 발생으로 출력신호의 진폭 감소 및 신호 손실이 발생하여 발진기 성능을 정상적으로 평가할 수 없다. 이러한 신호 손실 및 진폭감소를 방지하기 위해 지그(Jig) 시스템을 개발하고, 이를 통하여 발진기의 정확한 스펙트럼 분석 및 성능을 평가한다. 동작전원은 3.3 V, 주파수 범위 120-180 MHz 및 Q인수는 5K이다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 춘계학술대회 논문집
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• pp.85-88
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• 2005

In this study, it analysis electric field of SMD(Surface Mounted Device) Inductor Core and it get electric field only exist inside of SMD core. Therefore electric fields do not affect any device and equipments. These results are very important to design data acquisition system(several test equipments such as temperature, impedance, and current test), because data acquisition system can place under the SND Inductor core. So, it can be decrease their test error due to electric field.

• 한국전기전자재료학회논문지
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• 제37권3호
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• pp.314-321
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• 2024

Low road lighting is a lighting device that complements the shortcomings of existing pillar-type street lights. It is a lighting device that emits light from the side of the road surface and adjusts the luminance of the road surface like a light carpet. In this paper, to achieve full commercialization, we analyzed the luminance of the installed road surface and studied whether lighting could replace existing road lighting. In this study, the LMK (Luminance Measurement Camera) LABSOFT program was used to measure and analyze the surface luminance of road lighting, and the RELUX program was used to evaluate and analyze the simulation performance to determine light-based lighting conditions. A study was conducted to determine whether replacing pillar-type road lighting with low-level road lighting in a real environment would ensure comfortable and safe night vision for drivers at night.

• 조명전기설비학회논문지
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• 제18권4호
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• pp.15-21
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• 2004

광속구(integrating sphere photometer), 분광기(monochromator)등을 이용하여 노랑색(Y), 녹색(G), 백색(W)의 SMD(surface mounted device)형태의 HB LED(high brightness light emitting diode)에 대한 광속(luminous flux, LF), 상관 색온도(correlated color temperature, CCT), CIE 색도좌표(chromaticity coordinate CC)등 광특성을 실험하여 그 결과치를 비교 분석하였고, 백색 LED에 대해서는 연색지수를 고찰하였다.

• Journal of Plant Biology
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• 제28권4호
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• pp.329-332
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• 1985

A simple new device for obtaining very clear epidermal imprints for light microscopic studies is discussed. This new device is developed from“Britfix”(polystyrene cement) which is non-toxic to the plant organs. It involves direct application of the material on the desired surface of the plant organ to obtain thin, transparent replica. From the present investigation“Britfix”is found to be useful for the study of epidermal anatomy, morphology and physiology. Epidermal imprints can be mounted on the microscope slide without a mounting medium. Permanent slide of these imprints can be kept for any desired period without any deterioration of the replica.

• 한국광학회:학술대회논문집
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• 한국광학회 1989년도 제4회 파동 및 레이저 학술발표회 4th Conference on Waves and lasers 논문집 - 한국광학회
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• pp.185-192
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• 1989

It is shown that GaAs/GaAs stripe Roof-Top-Reflector LD is better than cleaved mirror LD by numerical analysis. And surface light emitting device is developed by LPE melt-back growth, which is of good controllability for OEIC. OEIC transmitter using RTR LD structured device and FET has been made and modulated, expected to show good modulation characteristics after solving process problem. Beam-Lead LD mounted on Si carrier has been made and shows low heat-resistance and so long life and good characteristics of LD.

• 대한조선학회논문집
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• 제47권3호
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• pp.388-397
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• 2010

A two-dimensional time-domain, potential-theory-based fully nonlinear numerical wave tank (NWT) was developed by using boundary element method and the mixed Eulerian-Lagrangian (MEL) approach for free-surface node treatment. The NWT was applied to prediction of primary wave energy conversion efficiency of a bottom-mounted oscillating water column (OWC) wave power device. The nonlinear free-surface condition inside the chamber was specially devised to represent the pneumatic pressure due to airflow velocity and viscous energy loss at the chamber entrance due to wave column motion. The newly developed NWT technique was verified through comparison with given experimental results. The maximum energy extraction was estimated with various chamber-air duct volume ratios.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 추계학술대회 논문집 Vol.19
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• pp.221-221
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• 2006

The SMD type P-N junction diode with ceramic package for diode case were fabricated. It was made this diode with simple process from $Al_2O_3$ ceramic chip, solder preform, diode chip, coating reagent and conductive paste for chip terrmination. Its merit is small size, easy manufacture. fast cooling with ceramic case. The electric characteristics of the diode such as reverse recovery time, breakdown voltage, forward voltage, and leakage current were 5 28ns, 1322V, 1.08V, $0.45{\mu}A$.

• 한국통신학회논문지
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• 제30권2A호
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• pp.107-113
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• 2005

본 논문에서는 통신소자의 경박 단소화 추세에 따라 적층 세라믹 SMD(surface mounted device) 패키지기술을 통하여 소형화한 $5{\times}7mm$의 크기의 VCXO를 개발한다. 이때 안정된 입력신호를 공급하기 위하여 양의 이미터결합논리(PECL)를 이용하고, 역메사형 HFF(high frequency fundamental) 기법을 이용하여 제작한 수정소자로 IC에 설계함으로써 동작전압은 3.3 V, 저전력하에서 120MHz-180MHz 범위의 주파수에서 발진하며, Q인자는 5 K이상, 3.5 ps rms의 낮은 지터(Jitter)와 위상잡음 특성 및 일정기간의 경화실험에서도 안정된 출력특성을 보인다.