• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1412-1413
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• 2008

본 연구에서는 산업용 거리 계측기에서 정밀한 측정에 요구되는 오차 보정 기법을 제시하였다. 제시한 기법은 본 연구에서는 산업용 거리 계측기에서 보다 정밀한 측정을 위한 방법으로 측정하고자 하는 기법을 전원회로에서의 잡음, 공급 전원의 잡음, 공통모드에서의 잡음, 중간주파수에 섞여 있는 잡음 및 비교기에서의 오차 저감 기법을 제시하고자 한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.07a
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• pp.139-140
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• 2016

iBeacon의 메시지를 이용하여 단일의 iBeacon 만으로도 정확한 거리를 측정할 수 있는 거리 측정 보정 방안을 제시한다. 이를 위해 iBeacon 메시지를 분석하여 축적된 데이터를 Smoothing을 통해서 오차 범위를 줄이고 거리에 따른 신호강도를 예측할 수 있는 방안을 제시한다. 이를 통해 신호간섭 및 거리 이동에 따른 iBeacon 메시지를 적게 수신하더라도 정확한 위치를 예측할 수 있는 방안을 제시한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.94-95
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• 2017

지정된 경로에서 6축 센서의 가속도와 각속도를 이용하여 물체의 이동거리를 계산하는 경우 가속도 센서에서 나오는 데이터는 중력을 사용하여 값을 보내주는데, 평평한 상태에서는 중력가속도만 나오므로 영향이 없지만 물체가 움직이면서 기울어지거나 흔들리는 경우 중력가속도와 운동가속도가 더해지고 이에 따라 이동거리 계산에 오차가 발생한다. 이 논문에서는 가속도와 각속도만으로 보정이 힘들다고 판단하여 적외선 센서를 사용하여 이동거리를 산출하는 방법을 제안하고 시스템을 개발한다. 제안한 시스템은 지정된 경로를 따라 이동할 때 적외선 센서를 이용하여 궤도의 구분선을 인식하여 기존 6축 센서로 계산된 이동거리를 보정한다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.49 no.2
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• pp.130-136
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• 2012

In this paper, we propose a near-field range estimation method for a uniform linear array that can calibrate bearing estimation error which give a bad influence on a range estimation process. When a range is fixed, the bearing error is calibrated to maximize the beamformer output by the proposed algorithm based on the gradient method. Simulation results show that the proposed algorithm can compensate the bearing error which is less than the mainlobe beamwidth so that reduce the range estimation error as similar as the case of no bearing error.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37 no.6C
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• pp.453-461
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• 2012

This paper proposes an improved phase estimation method for AM(Amplitude Modulation) range measurement system. The previous phase estimation method induces errors by Doppler shift of a moving target. The proposed method compensates phase estimation error through the ADC(Adaptive Doppler Correction) to take the Doppler shift, thus can improve distance measurement accuracy. When compared with the previous method through simulation results, the Doppler shift compensation and accuracy are improved by 94.7% and 50%, respectively. Target distance error in an acoustic tank is estimated to be 7.7cm, which confirms that the proposed method can be used to estimate the distance in the marine environment.

• Journal of the Korea Society of Computer and Information
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• v.15 no.6
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• pp.73-80
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• 2010

Vocabulary recognition system is providing inaccurate vocabulary and similar phoneme recognition due to reduce recognition rate. It's require method of similar phoneme recognition unrecognized and efficient feature extraction process. Therefore in this paper propose phoneme likelihood error correction improvement system using based on phoneme feature Bhattacharyya distance measurement. Phoneme likelihood is monophone training data phoneme using HMM feature extraction method, similar phoneme is induced recognition able to accurate phoneme using Bhattacharyya distance measurement. They are effective recognition rate improvement. System performance comparison as a result of recognition improve represent 1.2%, 97.91% by Euclidean distance measurement and dynamic time warping(DTW) system.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.1
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• pp.70-79
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• 2017

This study proposes a method to quickly and accurately acquire distance information on direction signs. The proposed method is composed of the recognition of the sign, pre-processing to facilitate the acquisition of the road sign distance, and the acquisition of the distance data. The road sign recognition uses color detection including gamma correction in order to mitigate various noise issues. In order to facilitate the acquisition of distance data, this study applied tilt correction using linear factors, and resolution correction using Fourier transform. To acquire the distance data, morphological operation was used to highlight the area, along with labeling and template matching. By acquiring the distance information on the direction sign through such a processes, the proposed system can be output the distance remaining to the next junction. As a result, when the proposed method is applied to system it can process the data in real-time using the fast calculation speed, average speed was shown to be 0.46 second per frame, with accuracy of 0.65 in similarity value.

• Explosives and Blasting
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• v.18 no.2
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• pp.14-22
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• 2000

The estimation of proper prediction method and the alteration of transformation method of environmental regulation standard were carried out by measuring blasting noise in construction field. The correlation of scaled distance with sound pressure level were better than with sound level, but it was proved to be difficult to control blasting noise because the correlation factor was too 1ow. three methods to transform sound pressure levee to sound level were examined. The method is the transformation by correlation equation of sound pressure level and sound level which are measured at the same time, and simplified transformation of A-weighting network corresponding to dominant frequency, and the transformation of sound pressure level by FFT. There were many errors to transform. The best effective method is the transformation using correlation equation of sound pressure level and sound level which are measured at the same time.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.1
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• pp.25-31
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• 2017

The indoor location based service proposed in the study was assigned to target a moving user. Positioning in the outdoor environment is accurate while using GPS. However, in an indoor environment, positioning is inaccurate and difficult. In order to overcome this, studies of various techniques for positioning based on wireless communication such as Wi-Fi, Zigbee and Bluetooth are being performed. The RSSI value and the delivery signal of the bluetooth beacon are measured according to the distance, and to a database. It was applied calculating the value for the average RSSI and the RSSI filtering feedback. Filtering is used to reduce the error of the RSSI values that are measured at long distance. When average and feedback filtering coefficient are set with 0.5, irregular and highly RSSI values are decreased. As the distance increases, the range of error is confirmed to have a reduction when using a distance calculation correction algorithm. Finally, when using the RSSI measurement results filtering, it corrects an unstable signal. Also, the distance correction algorithm is used to reduce a range of errors.

• Proceedings of the Korea Contents Association Conference
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• 2016.05a
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• pp.469-470
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• 2016

본 논문에서 제안하는 실내 위치기반서비스는 현행 송수신 통신에서의 움직이는 사용자를 대상으로 한다. 비콘의 주요 송출 신호인 RSSI 값을 이용하여 거리에 따른 비콘의 RSSI 값을 측정한다. 원거리에서 RSSI 값이 불안정하기 때문에 불안정한 신호를 보정하기 위해 RSSI 측정결과 필터링을 사용하여 원거리에 대한 값을 보정하는 알고리즘에 대해 설계 및 구현한다. 이를 위해 초기 단일파을 중심으로 실내측위가 이루어졌으며, 위치보정 및 오차범위에 대한 보정작업 역시 논의되었다.