• 한국전기전자재료학회논문지
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• 제25권1호
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• pp.1-5
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• 2012

In this paper, matching characteristic of MIM (metal-insulator-metal) capacitor with $Al_2O_3/HfO_2/Al_2O_3$ (AHA) structure is analyzed. The floating gate capacitance measurement technique (FGMT) was used for analysis of matching characteristic of the MIM capacitors in depth. It was shown that matching coefficient of AHA MIM capacitor is 0.331%${\mu}m$ which is appropriate for application to analog/RF integrated circuits. It was also shown that the matching coefficient has a more strong dependence on the width than length of MIM capacitor.

• 공업화학
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• 제21권5호
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• pp.527-531
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• 2010

Fe계 metal powder를 이용하여 최적화된 전자파차폐 시트를 제조한 후, 제조된 시트에 physical vapor deposition (PVD)법으로 여러 금속들을 증착시켜 최종 전자파차폐용 시트를 제조하였다. 또한 증착된 금속들의 전자파 효율 특성을 분석하기 위하여 polyvinylidene fluoride (PVdF) 나노섬유 막을 시트로 활용하였다. 전기적 특성을 알아보기 위해 4-point probe로 측정하였으며, energy dispersive spectroscopy (EDS)를 이용하여 제조된 sheet에 금속이 증착되었음을 확인하였다. 차폐효율은 전자파차폐효율측정기를 이용하여 측정하였다. 전기저항은 $1000\;{\AA}$일 때 Cu에서 $641.95{\Omega}{\cdot}cm$로 가장 낮은 저항 값을 나타내었다. 전자파 차폐효율은 증착된 금속의 두께의 증가에 따라 증가되었으며, Cu가 $1000\;{\AA}$으로 증착된 sheet가 최고 효율인 32.5 dB을 나타내었다.

• 조명전기설비학회논문지
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• 제23권2호
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• pp.27-35
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• 2009

본 연구에서는 먼저 도시적 특성의 분석을 토대로 안양시를 6개 지역으로 구분하였으며 지역별 구분에 따른 야간의 조도 휘도의 실측조사 및 야간이용자 패턴 조사를 통하여 야간경관의 문제점을 도출하였다. 야간경관 연출개념으로는 지역별 문제점 분석에 따른 개선방안과 예술적 가치를 창출하는 개념을 적용하여 예술도시로서의 안양의 이미지를 고양시키고자 하였으며 야간조명의 괌형과 통일성 확보를 위해 지역별 점진적 변화를 빛의 조닝의 개념으로 선정하였다. 특히, 건축물의 높이에 따른 건축물 기준선을 통해 주변 건축물과 조화된 단계적인 스카이라인을 연출하여 자연경관 등과 조화로운 조망권을 확보하도록 하였으며 지역 특성에 따라 가로등 및 가로시설물의 조도, 높이, 램프형태, 배열방식 등의 야간 조명환경의 개선방향을 추가로 제시하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.832-833
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• 2011

Interior Permanent Magnet Synchronous Motor (IPMSM) produces two kind of torque that Magnetic and Reluctance torque. The permanent magnet linkage flux and d-axis and q-axis inductances have an important influence on the torque characteristic of IPMSM. Thus their accurate prediction is essential for predicting performance aspect such as the torque and flux-weakening capabilities. In this paper, is calculated by LC resonance method with FEM. The results are validated by comparison the calculated by another method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.265-267
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• 2006

There are various elements that have influence on safety and reliability of high-speed railway vehicles. Among them, mechanical characteristics of traction motors are very important. Therefore, we verified that temperature characteristics have influence on damage and durability of these parts. We designed a measurement system for temperature test, and could measure the temperature of each device by the system. As the result of temperature test, we could confirm that the traction motors on Korean High-Speed Train satisfy the criteria. From this test, we get information of the traction motor about the temperature characteristic during running speed and running time.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.306-309
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• 2003

This paper presents a speed estimation algorithm of Switched Reluctance Motor(SRM) using flux-linkage modeling. The basic algorithm of this scheme is based on the flux linkage characteristic according to the phase current and the rotor position. A sufficient simulation and experimental data was used for neural network training. Through measurement of the phase flux linkage and phase currents, the neural network is able to estimate the rotor position and speed. The simulation result shows some good results, and possibility of this algorithm.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1154-1156
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• 2001

This paper presents the implementation of a positon sensorless vector control system of a PM linear synchronous motor by sliding mode observer based on TMS320F240 DSP controller. Sliding mode observer estimates the secondary velocity and position based on the measurement of current, and it shows very robust characteristic to parameter variation. Therefore, it improves the system performance deterioration caused by system parameter variations. Simulation and experimental considerations are presented to confirm the applicability of sliding mode observer to the sensorless position control of PMLSM.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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• pp.2616-2618
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• 2005

Time-frequency analysis (TFA) method was applied to identify the integrity of the internal local surface of a pipe where some chemical corrosions are likely to occur by acid mixed in the coolant of nuclear power plants. The spalling out of internal material pieces by corrosion induces some transient signals and the change of structural vibration of a local point in the pipe. It is therefore possible to detect the corrosion detachment through the measurement of the transient acoustic signals or the vibration signals. In this presentation, the TFA was configured on the vibrational signal data of the pipe and it is identified that the TFA can Provide an important information, i.e., the amplitude fluctuations in the instantaneous frequency of each characteristic frequency.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1989년도 추계학술대회 논문집 학회본부
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• pp.94-97
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• 1989

It is shown that fundamental plasma characteristic, which are sheath voltage and ion concentration, can be derived from measuring RF impedence. Plasma characteristics from this simple method are verified by direct measuring, to be reasonable. Using these values a new relation between isotropy and the ratio of sheath voltage to ion concentration is derived. For etch in which $CF_4$ is used, anisotropic etch can be achieved in its order $10^{-12}Vcm^3$ and isotropic etch in $10^{-12}Vcm^3$. These results are useful in every asymetric diode type etch system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1989년도 추계학술대회 논문집 학회본부
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• pp.151-154
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• 1989

In the measurement of plasma parameters of the plasma C.V.D with probe method, the most important problem is the contamination of the probe surface. In this paper, we observe the surface contamination of probe surface with microscope and determine the critical current and the critical time to sustain the clean surface of probe in the plasma C.V.D.