• Title/Summary/Keyword: Error-compensation

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A Study on the Compensation of Blood Pressure Caused by the Change of Arterial Pressure Shape (동맥압 형태변화에 따른 혈압 보정에 관한 연구)

  • Lim, S.S.;Park, K.L.;Lee, K.J.
    • Proceedings of the KOSOMBE Conference
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    • v.1998 no.11
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    • pp.177-178
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    • 1998
  • This paper is a study on compensation for error in estimation of mean pressure according to the change of arterial pressure shape. Because arterial pressure shape affects the mean pressure and blood volume which are important factors for measurement of blood pressure(BP), change of arterial pressure shape cause BP measurement error. In order to solve this problem, we add the compensation function C($\alpha$), depending on arterial pressure shape, to mathematical oscillometric model. Consequently, we could accurately estimate the blood pressure by correcting of the error using compensation function.

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Compensation Method of Current Measurement Error for Vector-Controlled Inverter of 2-Phase Induction Motor (2상 유도전동기용 벡터제어 인버터를 위한 전류측정 오차 보상 방법)

  • Lee, Ho-Jun;Yoon, Duck-Yong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.7
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    • pp.1204-1210
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    • 2016
  • The phase currents must be accurately measured to achieve the instantaneous torque control of AC motors. In general, those are measured using the current sensors. However, the measured current signals can include the offset errors and scaling errors by several components such as current sensors, analog amplifiers, noise filter circuits, and analog-to-digital converters. Therefore, the torque-controlled performance can be deteriorated by the current measurement errors. In this paper we have analyzed the influence caused by vector control of 2-phase induction motor when two errors are included in measured phase currents. Based on analyzed results, the compensation method is proposed without additional hardware. The proposed compensation method was applied vector-controlled inverter for 2-phase induction motor of 360[W] class and verified through computer simulations and experiments.

Improvement of Motion Accuracy Using Active Controlled Capillary in Hydrostatic Table (능동제어모세관을 이용한 유정압테이블의 운동정도 향상)

  • Park, C.H.;Song, Y.C.;Lee, H.S.
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.12
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    • pp.114-120
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    • 1997
  • For compensating the error motion of hydrostatic tables, we have introduced a way that the clearance of table is controlled corresponding to the amount of eror with the actively controlled variable capillary, named as ACC. In previous paper, through the basic test, it was confirmed that by the use of ACC, the error motion within 2.7$\mu$ m of a hydrostatic table could be compensated with the resolution of 27nm, 1/100 contollable range, and with the frequency bandwidth of 5.5Hz, structurally. In this paper, we performed practical compensation of the linear and angular motion error of hydrostatic table using ACC. For improving the compensated motion accuracy, iterative control method is put into the control system. The experimental results show that by the simultaneous compensation of error, the linear and angular motion error are improved upto 0.25$\mu$ m and 0.4arcsec, which are about 1/10 and 1/3 of the non-compensated motion errors respectively.

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Study on the Error Compensation in Strain Measurement of Sheet Metal Forming (박판성형 변형률 측정 오차보정에 관한 연구)

  • 한병엽;차지혜;금영탁
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.270-273
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    • 2003
  • The strain measurement of the panel in the sheet metal forming is essential work which provides experimental data needed to die design, process design, and product inspection. To measure efficiently the complex geometry strain, the 3-dimensional automative strain measurement system, which has high accuracy in theory, but has some 3∼5% errors in practice, is often used. The object of this study is to develop the error compensation technology to eliminate the strain, errors resulted when formed panels are measured using an automated strain measurement system. To achieve the study object, the position error calibration method correcting coordinates of the grid node recognized by a camera using error functions is suggested. Then the position errors were found by calculating the difference in the position of the cube node between real coordinates and measured coordinates in toms of node coordinates and the error calibration equations were derived by regressing the position errors. In order to show the validation of the suggested position error calibration method, finite element analysis and current calibration method was performed for the initial-blankformed.

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Compensation of Cross Talk Error for Optical Voltage Sensors

  • Cho, Jae-Kyong
    • Journal of the Optical Society of Korea
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    • v.11 no.4
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    • pp.177-182
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    • 2007
  • This paper discusses the errors associated with electric field cross talk for optical voltage sensors in a three-phase electric system and provides a solution to compensate the errors. For many practical conductor configurations, the electric field cross talk may cause errors unacceptable for the accuracy requirements of the sensors. We devised a real time compensation method for the cross talk and built an electronic circuits based on it. The mechanism of the compensation and the corresponding error reduction were discussed.

Development and Evaluation of Automatic Tool Compensation System (공구감시 시스템의 보정장치 개발과 평가에 관한 연구)

  • 정상화;신현성;차경래
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.11 no.5
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    • pp.93-99
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    • 2002
  • In general, manufacturing error is originated from bad material, machine tool defection and tool breakage. When the manufacturing process is stable, the most of error come from the tool wear. In common on-machine measurement teaching probe and touch sensor are widely used however in this paper the electric touch point type automatic tool compensation system is developed the performance of it is validated and effective operating is proposed.

Experimental Research of Business Practice Utilizing Geospatial Data (통합 공간자료 실무 활용에 관한 실험 연구)

  • Kim, Hyeong-Tae;Kang, Chang-Sik;Choi, Bo-Yeon;Eo, Yang-Dam
    • Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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    • 2010.04a
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    • pp.111-112
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    • 2010
  • The purpose of this research is to analyze the business process in which Korea Land & Housing Corporation utilizes spatial DB of NSDI(National Spatial Data Infrastructure) for compensation service. By the analysis of spatial data connected with compensation service, the influence of the matching error among spatial data on the business process for the service is identified and it is required to draw a direction for improvement in it.

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Nonlinearlity Compensation of Heterodyne laser interferometer based on LMS (LMS를 이용한 헤테로다인 레이저 간섭계 비선형성 보정)

  • Jeong, Pil-Joong;Lee, Woo-Ram;You, Kwan-Ho
    • Proceedings of the KIEE Conference
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    • 2007.10a
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    • pp.283-284
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    • 2007
  • In this paper we introduce a compensation of nonlinearity Heterodyne laser interferometer. The Laser Interferometer is used for length measurement in various industries. However, it has nonlinearity error caused by the imperfect optical equipment. This acts as an obstacle in the measurement improvement. We propose an adaptive error compensation using least mean square(LMS) to improve precision.

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Adaptive Error Compensation of Heterodyne Laser Interferometer using DFNN (DFNN을 이용한 헤테로다인 레이저 간섭계의 적응형 오차 보정)

  • Heo, Gun-Haeng;Lee, Woo-Ram;You, Kwan-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.57 no.6
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    • pp.1042-1047
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    • 2008
  • As an ultra-precision measurement system the heterodyne laser interferometer plays an important role in semiconductor industry. However the errors of environment and nonlinearity which are caused by air refraction and frequency-mixing separately reduce the accuracy of displacement measurement. In this paper we propose a DFNN(data fusion and neural network) method for error compensation. As a hybrid method of data fusion and neural network, DFNN method reduces the environmental and nonlinear error simultaneously. The effectiveness of the proposed error compensation method is proved through experimental results.

Design of HCBKA-Based TSK Fuzzy Prediction System with Error Compensation (HCBKA 기반 오차 보정형 TSK 퍼지 예측시스템 설계)

  • Bang, Young-Keun;Lee, Chul-Heui
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.6
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    • pp.1159-1166
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    • 2010
  • To improve prediction quality of a nonlinear prediction system, the system's capability for uncertainty of nonlinear data should be satisfactory. This paper presents a TSK fuzzy prediction system that can consider and deal with the uncertainty of nonlinear data sufficiently. In the design procedures of the proposed system, HCBKA(Hierarchical Correlationship-Based K-means clustering Algorithm) was used to generate the accurate fuzzy rule base that can control output according to input efficiently, and the first-order difference method was applied to reflect various characteristics of the nonlinear data. Also, multiple prediction systems were designed to analyze the prediction tendencies of each difference data generated by the difference method. In addition, to enhance the prediction quality of the proposed system, an error compensation method was proposed and it compensated the prediction error of the systems suitably. Finally, the prediction performance of the proposed system was verified by simulating two typical time series examples.