• 전기학회논문지
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• 제60권2호
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• pp.320-324
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• 2011

A digital technique is adopted to calibrate the current mismatch of the charge pump (CP) in phase-locked loops. A 2 GHz charge pump PLL (CPPLL) is used to justify the proposed calibration technique. The proposed digital calibration technique is implemented simply using a counter. The proposed calibration technique reduces the calibration time by up to a maximum of 50% compared other with techniques. Also by using a dual-mode CP, good current matching characteristics can be achieved to compensate $0.5{\mu}A$ current mismatch in CP. It was designed in a standard $0.13{\mu}m$ CMOS technology. The maximum calibration time is $33.6{\mu}s$ and the average power is 18.38mW with 1.5V power supply and effective area is $0.1804mm^2$.

• Journal of Mechanical Science and Technology
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• 제14권1호
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• pp.113-120
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• 2000

This study has developed a new liquid crystal calibration technique using Neural networks with median filtering and applied this technique to heat transfer measurements. To verify the validity of this new measurement technique, the local Nusselt numbers on a flat plate surface subjected to an axisymmetric impinging jet were measured and compared with the results by the conventional Hue-temperature calibration technique under the same conditions. Because the Neural networks predict the non-linear relations between temperatures and corresponding R, G, B values, Neural networks-median filtering calibration technique can utilize a much wider color band in the experiment than the Hue-temperature calibration technique, resulting in a significant reduction in the experimental time.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 하계종합학술대회논문집
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• pp.413-416
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• 1998

This paper presents a dAC calibration technique for high resolution and monolithic operation. The calibration technique consists of basic source, current memory cell (C.M) and current substrator. Current memory supplies the error current to basic source. Current substrator extracts the error current from the main source. It is simple and needs no special calibration period. The proposed current cell has high calibration performance and guarantees 100MHz operation.

• Communications for Statistical Applications and Methods
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• 제28권5호
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• pp.493-510
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• 2021

The present article endeavours to develop partial optional randomized - response technique (PORT) to deal with sensitive issues in presence of non-response in successive sampling. Calibration techniques have been embedded with PORT to estimate sensitive population mean at current move in two move successive sampling in presence of non-response. Optimum calibration weights are computed at each move with the aid of constraints based on auxiliary information. Detailed properties of the proposed estimators have been discussed. Possible cases in which non-response may creep at two moves has been explored. The proposed technique has been compared with the modified existing technique. Simulation results indicate that the proposed technique is more efficient than existing, modified one. Suitable recommendations are forwarded.

• 한국전자파학회논문지
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• 제21권4호
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• pp.408-416
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• 2010

본 논문에서는 X-밴드 대역의 지상운용용 HPS(Hongik Polarimetric Scatterometer) 시스템 보정에 관한 연구 결과를 선보인다. Scatterometer 시스템 보정을 위해 이론적으로 RCS(Radar Cross Section)가 잘 알려진 금속구, 삼각수동 반사기(trihedral corner reflector), 금속봉 등과 같은 보정용 목표물을 이용하여 이론값과 측정값을 비교함으로써 scatterometer 시스템의 왜곡 정도를 분석한다. 실외 환경에서 scatterometer 시스템을 이용하는 실제 측정상황의 보정 정확도는 보정용 목표물의 정확하고 안정된 측정에 의해 좌우되므로 이를 보완하기 위해 HPS 시스템의 입사각(${\xi}-$, ${\phi}-$방향) 제어 기능을 응용한 자동화된 2차원 목표물 스캐닝 측정법(2-D target scanning technique) 을 함께 선보인다. 이때, scatterometer 시스템의 왜곡 정도를 보정하기 위한 기법으로는 GCT(General Calibration Technique) 기법과 STCT(Single Target Calibration Technique) 기법을 비교 연구하였으며, 보정 정확도를 분석하기 위해서 시험용 목표물로 삼각 수동 반사기의 편파별 RCS와 위상차를 측정/비교하였다. 시스템 보정 정도를 검증하기 위해 세 종류(10/20/30 cm)의 삼각수동 반사기를 이용하였으며, 동일 편파 RCS는 GCT 기법과 STCT 기법을 이용하여 각각 ${\pm}1.0$ dB과 ${\pm}0.5$ dB의 오차 범위에서 보정되었다. 또한, 동일 편파간 위상차( ${\phi}_{hh}-{\phi}_{vv}$)는 이론 값과 비교하여 $-20^{\circ}{\sim}0^{\circ}$와 약 ${\pm}5^{\circ}$의 오차를 각각 보였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1368-1371
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• 1996

This paper presents an automatic calibration technique for piezoelectric low pressure transducer, which is useful to measure a pressure within 500 psi. This system with automatic calibration function and error correction algorithm generates standard dynamic pressure for the calibration of sensor. With the compensation for the offset voltage and the pressure error, the accuracy and the usefulness of the proposed scheme is validated.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.1012-1016
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• 1996

This paper presents an automatic calibration technique for piezoelectic low pressure transducer, which is useful to measure a pressure within 500 psi. This system with automatic calibration function and error correction algorithm generates standard dynamic pressure for the calibration of sensor. With the compensation for the offset voltage and the pressure error, the accuracy and the usefulness of the proposed scheme is validated.

• Nuclear Engineering and Technology
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• 제53권2호
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• pp.695-698
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• 2021

Efficiency calibration is a fundamental procedure in gamma spectrometric measurement. Experimental technique for efficiency calibration transfer in gamma spectrometer along different geometries and volumes has been developed and validated in this work. The developed technique offers simple and easy procedures to overcome several problems encountered in efficiency calibration of gamma spectrometer such as rate-related correction and different sample volumes. The validation shows that application of the developed technique has a precision of 95%.

• 한국군사과학기술학회지
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• 제6권3호
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• pp.15-21
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• 2003

This paper contains a precise calibration technique for the position of seabed acoustic target and theoretical error analysis of calibration results. The target is deployed on seabed as a standalone transponder. The purpose of target is performing accuracy test for active sonar as well as position calibration itself. For the position calibration, relative range between target and test vessel should be measured using target's transponder function. The relative range data combined with vessel position can be converted into a estimated position of target by the application of nonlinear LSE method. The error analysis of position calibration was divided into two stages. One is for relative range estimator and the other for target position estimator. Numerical simulations for position calibration showed good matching between results and developed CRLB.

• 제어로봇시스템학회논문지
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• 제3권4호
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• pp.357-362
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• 1997

This paper suggests an automatic calibration technique for piezoelectric low pressure transducer measuring a pressure blow 500psi. The present calibration system embedded with error correction algorithm generates it's best you don't cut parts of wards like so dynamic pressure and compensates offset voltage and pressure error. It is shown via experimental results that the instrumentation accuracy has been improved and mean time between calibrations has been shortened.