• Electronics and Telecommunications Trends
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• v.14 no.3 s.57
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• pp.123-124
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• 1999

ASADE(ASIC Signal Analyzer Developed in ETRI)는 논리회로의 시뮬레이션 결과를 입력으로 받아서 그래픽 화면으로 논리파형으로 나타내고, 파형의 상호관계를 분석하기 위한 다양한 분석 기능들을 제공하는 파형분석용 CAD 툴이다. 파형분석은 설계 과정 중에서 수 없이 반복되는 작업이기 때문에 파형분석기의 성능이 설계기간 단축에 결정적인 영향을 미치게 된다. ASADE는 상용 파형분석기보다 GUI 환경, 처리속도, 분석 기능이 뛰어난 툴이다.

• Journal of the Earthquake Engineering Society of Korea
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• v.1 no.1
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• pp.19-24
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• 1997

The seismic of the main shock and two after shocks of the Yeongwol Earthquake are studied based on the phase analysis. The travel time curves and two point ray tracing with 12 different possible phases are used to analyze the phases of the records, which were provided by KIGAM seismic network. The results of phase analysis of the Yeongwol Earthquake show the characteristics as follows 1) The main shock ($M_s$=4.5) clearly shows Pn phase but two after shocks ($M_s$=3.8 and $M_s$=2.5) do not show Pn phase. 2) The Pg PmP looks as first arrival phase in the after shock records whose epicentral distance is smaller or larger than 145 km, 3). It is very difficult to identify the phases in the seismic records, which ae related to the Conrad discontinulty, even if the Conrad discontiulty exists. 4) The record of GRE station located outside of the Kyeongsan Basin shows different arrival time of Pn phase, P-S duration time and frequency comared with those of the other stations located within the Kyeongsan Basin.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.513-514
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• 2007

최근 들어, 디지털 보호 계전기의 계측 및 계전 기능 외에 운용 프로그램 및 사고파형 분석 기능 또한 중요시 하고 있는 실정이다. 이를 위해 저장된 사고파형을 분석하기 위한 프로그램 개발이 요구되어 지고 있으며 본 논문에서는 다양한 기능을 가지는 사고파형 분석 프로그램을 소개한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.142-146
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• 2017

지진해일의 수리특성을 분석하기 위하여 유사한 파형특성을 가진 고립파를 많이 이용하고 있다. 그러나 고립파의 근사파형은 실제 지진해일에 비해 상당히 좁은 파형분포를 가지고 있다. 이에 수치모의에서는 기존의 고립파 근사식을 개량하여 고립파형의 지진해일을 수치적으로 생성하고 있다. 본 연구에서는 지진해일의 파형분포에 따른 월파특성을 수치적으로 조사하기 위하여 개량된 고립파 근사식을 2차원 N-S solver에서 적용하였다. 이것에 기초하여 수치파동수조에 직립호안과 그 배후에는 월파수조를 설치하고, 지진해일 월파량을 측정하였다. 수치해석결과로부터 직립호안 주변의 공간파형과 마루 위의 유속분포로부터 파형분포에 따른 월파현상을 분석할 수 있었다. 또한 기존 고립파 근사이론 대비 개량된 고립파의 체적비에 따른 월파량 변화를 정량적으로 조사하였다. 그 결과 지진해일의 체적비가 증가할수록 월파량이 거의 선형적으로 증가하는 경향을 나타내었다.

• Progress in Medical Physics
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• v.18 no.1
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• pp.20-26
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• 2007

It is expected that synaptic construction and electrical characteristics In degenerate retina might be different from those In normal retina. Therefore, we analyzed the retinal waveform recorded with multielectrode array in normal and degenerate retina using principal component analysis (PCA) and Independent component analysis (ICA) and compared the results. PCA Is a well established method for retinal waveform while ICA has not tried for retinal waveform analysis. We programmed ICA toolbox for spatiotemporal analysis of retinal waveform. In normal mouse, the MEA spatial map shows a single hot spot perfectly matched with PCA-derived ON or OFF ganglion cell response. However In rd/rd mouse, the MEA spatial map shows numerous hot and cold spots whose underlying interactions and mechanisms need further Investigation for better understanding.

• The Journal of the Acoustical Society of Korea
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• v.11 no.4
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• pp.14-21
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• 1992

The waveform coding is concerned with simply preserving the wave shape of speech signal through a redundancy reduction process. In area of the speech synthesis, the waveform codings with high quality are mainly used to the synthesis by analysis. However, because the parameters of this coding are not classified as either excitation parameters and vocal tract parameters, it is difficult to applying the waveform coding to the synthesis by rule. In this paper, we proposed a new pitch alternation method that can change the pitch periods in the waveform coding by using the cepstrum analysis. Thus, it is possible that the waveform coding is carried out the synthesis by rule in speech processing.

• Journal of Biomedical Engineering Research
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• v.21 no.4
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• pp.411-417
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• 2000

This paper describes the analysis of the oscillometric method based on the shape of arterial pressure and proposal of a new algorithm for estimating the blood pressure by computer simulation. In the first step, the arterial pressure model which is able to control the shape of arterial pressure was designed and then we simulated the oscillometric model using both the existing exponential model showing the static arterial pressure-volume relation and the designed arterial pressure model. By analyzing the correlation of characteristic ratio based on the shape of arterial pressure, we could find that the characteristic ratio was not the only standard parameter for estimating systolic and diastolic pressure. We were able to estimate the shape of arterial pressure by computing the correlation of arterial pressure shape with oscillation shape. Finally, we proposed an algorithm which is able to estimate systolic and diastolic pressure according to pressure(Pp) table constructed from the relation of maximum amplitude of oscillation and arterial pressure shape. We tested 60 arterial pressure waveforms having various arterial pressure shape and pulse. As a results, the absolute deviation average values of the estimation of systolic, diastolic and mean pressure were 1.62%, 2.40% and 2.20%, respectively. In conclusions, the proposed algorithm showed the possibility of usefullness in estimating the blood pressure.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.199-200
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• 2008

이 논문에서는 백서를 이용한 출혈성 쇼크 실험에서 수집되는 혈압 데이터 분석을 위한 프로그램을 개발하였다. 일반적인 혈압 데이터는 기존 프로그램을 이용하여 분석이 가능하지만 출혈성 쇼크 실험 중에 획득되는 혈압 데이터의 경우 일반적인 경우와 다른 모양의 파형이 나타나는 경우가 있으며 파형의 크기 변동이 크다. 이런 문제들로 인해 기존 프로그램으로 분석하는데 어려움이 있어 출혈성 쇼크 실험에 적합한 프로그램을 개발하였다. 본 논문에서 개발한 프로그램을 이용하여 혈압 파형을 분석한 결과 기존 프로그램에서 잘못 분석된 이완기 혈압을 정상적으로 분석 할 수 있었다. 또한 전체 구간 데이터를 분석하면서, 혈압 파형 크기의 급격한 변화로 인해 잘못된 수축기와 이완기 혈압이 출력되던 문제점을 해결 할 수 있었다. 이렇게 분석된 데이터를 이용하여 추후에 다양한 방법의 혈압분석이 가능할 것으로 사료된다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.3
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• pp.195-207
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• 2017

Recently, the SAR-GMTI mode is becoming increasingly essential in airborne radar systems. While SAR requires wideband waveforms for high resolution imaging, GMTI requires narrowband waveforms for doppler processing, which makes general LFM waveforms difficult to use for SAR-GMTI. This paper analyses the FJB(Frequency Jump Burst) waveform, which is studied for the SAR-GMTI waveform, and presents the method for the pulse compression and SAR image formation using FJB waveforms. Simulation results show that there is little difference in performances between the FJB waveform and the LFM waveform.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.1
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• pp.64-69
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• 2005

In this paper, we analyzed the nonlinear performance on the DS/CDMA Communication System. At the $BER=10^{-4}$, uniform chip waveforms have similar performance in the linear channel. However, non-uniform chip waveforms have about more 0.5[dB] power gain than the conventional raised-cosine chip waveforms. In the nonlinear HPA, non-uniform chip waveforms have worse BER performance than the uniform chip waveforms because of the high PAPR. In other words, non-uniform chip waveforms show similar performance as uniform chip waveforms if IBO (input back on) of 15[dB] is given.