• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.648-655
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• 1993

The hydraulic coconut dehusking machine consists of three main parts ie. The frame , the power unit including the hydraulic accessories, the lifting and dehusking mechanisms. Two sets of the hydraulic coconut dehusking machine were developed . their hydraulic and electrical control circuits were connected in series to enable them operating contemporaneously. Two operators are required to operate the machine. Each of them put a coconut on the lifting mechanism in order to start the working cycle automatically. As a result, the nut are immediately pushed up and seized by the holding teeth under the supplement of the hydraulic reducing circuit. After that the dehusking mechanism started operating via the sequence circuit. At the end of the cycle, both mechanisms return to their original positions. Some remaining fibrous is taken out manually from the nut subsequently . The continuous dehusking speed was found to be 22.2 seconds per 2 coconuts.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1993년도 추계학술대회 논문집
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• pp.35-38
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• 1993

SCLD(supercondocting current 1imiting device) with YBaCuO superconductor was fabricated by the sol-gel and the doctor-blade method. Critical current density ($J_{c}$) and critical current ($I_{c}$) of the SCLD are 100.27 A/$cm^2$and 1A at 77K and the electrodes contact with SCLD by silver paste. The SCL was connected with test circuit in series. When apple iud current exceed critical current value of the SCLD in testing circuit, the SCLD ristricts the over current by generating resistance itself without delay. Resistance of SCLD increase lineary 0 to 1.6$\Omega$ in propotion to applied current above the critical current $I_{c}$.

• 제어로봇시스템학회논문지
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• 제17권2호
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• pp.171-175
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• 2011

In this paper, I have developed a high-speed and high-resolution measuring device in order to check the performance of drycell. The system is developed for the drycell manufacturing plant. Measuring time is one of key factors to inference on the production speed. So the developed system is designed to generate the classified result up to 1200ea/min. In the other words, each product can be classified within 25ms. There have been many studies to estimate both state of charge as well as state of health, such as OCV (Open Circuit Voltage), SC (Short Circuit) and measuring impedance with frequency pulse. But those methods take a few second due to surface discharge. To overcome the phenomenon, I developed the method to engage the reverse current to two electrodes of battery. As a result, I could achieve to measure the indigenous capacity without the problem of surface discharge.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 1999년도 제1회 학술대회논문집(KIASC 1st conference 99)
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• pp.146-149
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• 1999

A 30kVA superconducting generator has been designed, developed and successfully tested recently. The design is based on 2-dimensional electromagnetic field analysis. The rotor has been wound with superconducting wire of Nb-Ti alloy. The stator has the air-gap type armature windings. Open-circuit test, short-circuit test and lamp load test have been conducted. The details of design program, design, machinebuilding, test results and conclusions are given in this paper.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1589-1592
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• 2003

Automatic grease lubricator of gear type was developed by mechanical design, analysis and test with products manufactured by rapid prototyping machine. The mechanism of gear driving was designed in similar to the watch mechanism and lubrication could be controlled by PCB circuit. The body of the lubricator was analyzed by stress analysis with different constructed angle. Digital mockup was analyzed and RP products were combined with PCB circuit and grease. RP products and injection moulding products were tested and compared for roughness and roundness, Finally the grease was drained out for testing the time.

• 대한전자공학회논문지
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• 제18권3호
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• pp.52-57
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• 1981

본 논문은 회로의 복잡성이 증가됨에 따른 신뢰도와 개선과 유지보수에 대한 효율성을 높이기 위한 연구로서 측정이 가능한 작은 회로 블럭을 모듈 단위로 설계하여 이들의 조합으로 디지틀 시스템을 구성하였다. 이는 측정상에 신호 발생기와 신호 해석기가 필요치 않고 모듈 단위로 완전 측정되기 때문에 높은 신뢰도와 짧은 측정 시간을 갖는다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1876-1878
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• 1996

This paper describes the combination surge generator for applying performance tests of surge protective devices. The $8/20{\mu}s$ waveform applies to low impedance circuits and components and is commonly used to determine the characteristics of surge protective devices. And the $1.2/50{\mu}s$ waveform applies to high impedance circuits and components and is used for testing dielectric behavior. Therefore, the combination surge generator, which generates $1.2/50{\mu}s$ voltage waveform under open-circuit conditions and $8/20{\mu}s$ current waveform under short-circuit condition, was proposed. Also this generator can produce $10/1000{\mu}s$ as well as $0.5{\mu}s/100kHz$ ring waveform.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.473-473
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• 2000

This paper presents the 2-bit parallel algorithmic ADC using current mode for parallel method algorithm. It is operated by parallel conversion, 2-bit at each moment, and increase bit numbers by serial connection. The circuit operates in current mode. The comparison ratio can be controlled while working under mode operation. The circuit design used 0.8 ${\mu}{\textrm}{m}$ CMOS technology which capable to convert 2-bit in 50 ns, power consumed 0.786 nW, with input current 0-50 mA from 3V single supply. From simulation testing, the conversion rate is much faster than other method.

• Progress in Superconductivity
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• 제1권2호
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• pp.105-109
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• 2000

We have designed and fabricated a single-flux-quantum(SFQ) four-stage shift register using YBCO bicrystal Josephson junctions, and tested its operations using a digital measurement set-up. The circuit consists of 4 shift register stages and a read SQUID placed next to each side of the shift register. Each SQUID was inductively coupled to the nearby shift register stage. The major obstacle in testing the circuits was the interference between the two read SQUIDs, and we could get over the problem by determining the correct operation points of the SQUID from the simultaneously measured modulation curves. Loaded data ('1' or '0') were successfully shifted from a stage to the next by a controlled current pulse injected to the bias lines located between the stages, and the corresponding correct data shifts were observed with the two read SQUIDs.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.717-718
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• 2006

최근 저압 기중차단기(ACB, Air Circuit Breaker)는 고압중전기 공인시험제도 및 저압전기기기 안전인증제도와 같은 강제인중 대상에서 제외되어 해당 성능에 대한 안전 사각지대에 놓여있다는 지적을 받아왔다. 본 논문에서는 현재의 ACB관련 규격 및 성능평가기술을 분석하고, 국제규격과의 비교 분석을 통하여 국제규격에 준하는 성능평가기술 및 규격을 제시하는 방안을 연구하였다. 특히 내년에 제정이 논의되고 있는 ACB관련 KS 규격의 제정 방향 및 KS 심사기준에 대한 진행방향 설정과 연구되어야할 성능평가기술을 제품성능 특성별로 제시하였다. 향후 본 논문의 성능평가기술 및 제안 방향이 KS규격 제정 및 활용에 중요한 근간을 제공할 것으로 기대한다.