• Proceedings of the KIEE Conference
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• 2003.04a
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• pp.163-165
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• 2003

Over the past several years, the application extent of the real-time systems is being expanded with the progress of civilization. An effort to minimize power consumption at the system is being accomplished in several fields from the design of an analog/digital circuit up to the device level Things of this effort have included the power optimum-technique to minimize power consumption at the digital logic circuit and the dynamic managed skill by means o( the decision of the operating system. In this paper, we designed of low power system by using Power-optimized method. As an effective low-power design, we designed the low power system which it has a monitoring system within the main board and a personal computer.

• Proceedings of the KIEE Conference
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• 2003.11b
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• pp.27-30
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• 2003

Wireless power transmission system is one of the very interesting field not only in a technical and economical point of view but also that people are still trying to realize lossless power transmission. This paper has a purpose on the efficient power transmission at the passive type ICcard by using wireless power transmission system. The most difficult but important part of the passive type RF-ID system is building the system that supplies power from Reader-antenna to IDcard-antenna. To check what is the most efficient way to deliver power depending on what kind of specifications of the power-amp in reader, antenna and antenna in IDcard is for operating IDcard circuit efficiently receiving the power from reader-antenna. For this, we used 125kHz sinewave for RF signal as a basic specification, power-amp : OP-Amp for amplifying signal and AB Class push-pull power-amp for amplifying power, loop type antenna.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.3
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• pp.561-565
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• 2007

We propose glass and PDMS (polydimethylsiloxane) chips for DNA amplification with continuous-flow PCR (polymerase chain reaction). The PDMS microchannel was fabricated using a negative molding method for sample injection. Three heaters and sensors of ITO (indium-tin-oxide) thin films were fabricated on glass chip. ITO heaters and sensors were calibrated accurately for the temperature control of the liquid flow. ITO heater generated stable heat versus applied power. ITO sensor resistance was changed linearly versus temperature increase as a RTD (resistance temperature detector) sensor. As a result, we enable precision temperature control of continuous-flow PCR chip. Using the continuous-flow PCR chip DNA plasmid pKS-GFP 720 bp was successfully amplified.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.684-685
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• 2011

종래의 배전계통에 있어서의 전력조류는 변전소에서 선로 말단을 향한 단방향이었지만, 태양광전원이 연계된 경우에는 그 출력용량의 여부에 따라 양방향의 전력조류가 발생할 가능성이 있어, 계통운용상 여러 가지의 문제점이 야기될 수 있다. 따라서 본 논문에서는 태양광 전원 연계에 따른 정상상태 시와 각종 전력품질에 대한 문제점을 상세히 분석하기 위하여, 실계통의 특성을 모의한 태양광전원 평가 시뮬레이터를 제작하였다. 그리고 이 장치를 이용하여 역률, 선로길이, 태양광발 전량의 변동에 따른 계통의 다양한 운용특성시험을 수행하여 제안한 평가 시뮬레이터의 유용성을 확인하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1068_1069
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• 2009

$TiO_2$의 계면적을 넓힘으로써 태양전지의 특성을 향상시키기 위해 정렬도가 높은 나노 기공 (nanopore, NP) 이산화티타늄 ($TiO_2$)을 이용하여 복합 태양전지를 제작하였다. Polymethyl methacrylate (PMMA)를 사용한 nanoimprinting lithography (NIL) 기술을 이용하여 NP $TiO_2$를 제작하였으며. 광활성층으로는 poly(3-hexylthiophene) (P3HT)와 [6,6]-phenyl $C_{61}$ butyric acid methyl ester (PCBM)을 사용하였다. NP $TiO_2$를 이용한 태양전지의 전력변환효율이 1.49%로 표면이 고른 소자의 효율인 1.18%에 비해 26% 가량 증가하였다. 이와 같은 효율 향상의 원인은 $TiO_2$와 광활성층의 계면이 증가되어 전하의 생성과 분리가 용이해졌기 때문인 것으로 사료된다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1553_1554
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• 2009

마이크로칩에서의 생체물질 분석에 있어서 재현성은 매우 중요한 사항이다. 이전부터 많은 연구자들에 의해서 분석시 재현성을 향상시키고자 많은 연구가 선행되었다. 재현성을 향상시킬 수 있는 한 방안으로 겔 전기영동이 이용되고 있다. 본 연구에서도 겔 전기영동을 마이크로칩에 접목시켜 재현성을 향상시키는 실험을 진행하였다. DNA 시료로 100bp부터 1500bp 길이의 DNA 단편들을 사용한 결과 인산완충식 염수 (PBS)만을 사용하였을 경우보다 인산완충식염수(PBS)와 5% 폴리아크릴아미드 겔 (5% polyacrylamide)과 같이 사용하였을 경우 더 향상된 재현성을 확보하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2009.06a
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• pp.436-438
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• 2009

To evaluate short rotation forestry candidates, seven clones of Salix hultenii were investigated as focused on chemical compositions and energy contents. There were significant variations in chemical compositions and energy contents among different clones. Variations in hot-water extractives content were 6.6-16.0% and 19.6-25.4% variation in lignin content. In carbohydrate compositional analysis, xylan contents were 7.5-13.1% with variation among different clones. Higher heating values were 17.69-20.02 MJ/kg.

• Proceedings of the KIEE Conference
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• 1998.11c
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• pp.850-852
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• 1998

SiC thin film have been prepared by ICP-CVD for low temperature deposition and large area deposition. The structural properties of deposited SiC films are characterized by employing SEM, FT-IR, XRD, XPS and Raman Spectroscopy. From the experimetal results, good crystallinity has been achieved in $1000^{\circ}C$ grown SiC film which have carbonization step at $1100^{\circ}C$ for substrate bias of 30V.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10a
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• pp.788-792
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• 1993

The objective of this study is to develope a satellite dynamic simulator, which can test and analyze the performance of spacecraft attitude control, antenna pointing instruments, communication equipments and spacecraft components under the space environment. The satellite simulator can be used to predict the events such as malfunction and failure of satellites in space during operation and can be used to protect against emergencies. At first, the performance test system of attitude control is investigated which can simulate motion and verify stability of spacecraft. Our system consists of an attitude control main processor and a sub-processor including some real hardwares such as attitude sensors and actuators. In this paper, we describe the procedure of designing and manufacturing the dynamic simulator hardware, which consists of the central processor board, the sub-processor board and the sun sensor, and also communication between the components.

• Journal of the Korean Institute of Telematics and Electronics
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• v.27 no.8
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• pp.1294-1302
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• 1990

In this paper, optical implementation of single layer perceptron to discriminate the even and odd numbers using commericla LCTV spatial light modulator is described. In order to overcome the low dynamic range of gray levels of LCTV, nonlinear quantized perceptron model is introduced, which is analyzed to have faster convergent time with small gray levels through the computer simulation. And the analog weights containing positive and negative values of single layer perceptron is represented by using the polarization-based encoding method. Finally, optical implementation of the nonlinear quantized perceptron learning model based on polarization property of the commercial LCTV is proposed and some experimental results are given.