• Title/Summary/Keyword: the waveform analysis

Search Result 743, Processing Time 0.03 seconds

Study on the Waveform Analysis of Radial Artery Pulse Diagnosis Using Pulse Meter and Analyzer - the Waveform Analysis of Left KWAN Pulse Dignosis - (맥상기를 통한 요골동맥 맥진법의 맥파분석 - 좌관부위 맥파요인을 중심으로 -)

  • Kim, Gyeong-Cheal;Lee, Jeong-Won;Ryu, Kyeong-Ho;Park, Dong-Il;Shin, Woo-Jin;Kang, Hee-Jung
    • Journal of Physiology & Pathology in Korean Medicine
    • /
    • v.23 no.1
    • /
    • pp.186-191
    • /
    • 2009
  • In the study on the waveform analysis of radial artery pulse diagnosis, we need to establish fundaments of contemporary pulse diagnosis research. As we will to do experimental research on the difference of pulse waveform on the radial artery with applied variations of pressure(5 stage-pressure) and measuring position(CHON, KWAN, CHEOG). First of all, in this research, we did the experiment of the study on the waveform analysis of radial artery(left KWAN) pulse dignosis by using 3 dimension pulse meter and analyzer (3D MAC). As a result. we extracted the seven measurement fluents : energy(E), size of cycle(h1), size of reflection cycle(h2), time of reflection cycle(t2), time of contraction (t4), width of cycle(w), area of waveform(A) by the statistically reasonable differences. We expect that the seven measurement fluents contribute to divide the situation through the results of waveform analysis of radial artery.

A Study on the Blasting Dynamic Analysis Using Superposition Modeling Data (중첩모델링자료를 활용한 발파 동해석 기법에 관한 연구)

  • Park, Ji-Woo;Kang, Choo-Won;Go, Jin-Seok;Jang, Ho-Min
    • Tunnel and Underground Space
    • /
    • v.18 no.4
    • /
    • pp.280-288
    • /
    • 2008
  • Since blast-induced vibration may cause serious problem to the rock mass as well as the nearby structures, the prediction of blast-induced vibration and the stability evaluation must be performed before blasting activities. Dynamic analysis using measurement vibration waveform which is measured by bore hole blasting or test blasting has been increased recently in order to analyze the effect of the blast-induced vibration. The waveform made by bore hole blasting has the similar vibration level and duration to those the waveform of sing hole has. However, there can be a little difference in attenuation characteristics with the blast induced vibration waveform in the field. Through the superposition modeling of single hole waveform, I obtained the vibration waveform on the blasting condition changes and conducted dynamic analysis using this waveform in this study.

A Study of Negative Waveform in ac PDP during Reset and Address Periods (ac PDP에서의 Reset과 Address 구간에서 Negative Waveform특성에 관한 연구)

  • Eom, Cheol-Hwan;Kang, Jung-Won
    • Journal of the Semiconductor & Display Technology
    • /
    • v.8 no.1
    • /
    • pp.27-31
    • /
    • 2009
  • A characteristic of new waveform, called a negative waveform, was studied during reset and address periods. IR distribution, black luminance and time delay were measured to compare the negative waveform with the conventional positive waveform. Based on the analysis of IR measurement, the negative waveform could accumulate more wall charges than the positive waveform. Also the black luminance of negative waveform was lower than that of positive waveform under the same bias and ramp-slope conditions. During address period, the discharge time lag was measured. The negative waveform was showed 0.25 us faster formative time lag and 0.1 us faster average time lag than those of positive waveform.

  • PDF

Analysis for the Fluctuation of the Photoplethysmographic Waveform derived by Temperature Stress of Measuring Position (측정부 온도 부하에 따른 광용적맥파 파형 요동 특성 분석)

  • Lee, Chungkeun;Shin, Hangsik
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.64 no.2
    • /
    • pp.304-309
    • /
    • 2015
  • Applicable range of Photoplethysmography (PPG) becomes wider as a non-invasive physiological measurement technique. However, PPG waveform is easy to be distorted by ambient light or vascular variation from temperature changes. Especially, irregular variation of PPG waveform caused by ambient temperature not only severely distorts the PPG, but also leads miss interpretation in clinical applications. Therefore, the investigation of between temperature and PPG waveform is quite important in using PPG. The purpose of this research is to quantify the PPG waveform characteristic and to investigate the waveform variation following the temperature change on measuring site. To quantify the fluctuation of PPG waveform, we use two techniques; detrended fluctuation analysis (DFA) and AC/DC analysis of PPG. We record PPG under temperature stress, which applied by medical use heat pack ($40^{\circ}C$) and ice pack ($0^{\circ}C$). Ten participants were applied to the experiment, and the result was evaluated to approve the temperature effect with statistical method, Wilcoxon signed rank test. The result shows that the AC component (p<0.05) and perfusion index DFS scale exponent (p<0.01) of PPG have the significance to temperature stress except for a DC component of PPG.

Performance Analysis for Secured Service Signals of RNSS Systems

  • Han, Kahee;Lee, Subin;Lee, Kihoon;Won, Jong-Hoon
    • Journal of Positioning, Navigation, and Timing
    • /
    • v.11 no.4
    • /
    • pp.341-349
    • /
    • 2022
  • When designing a new RNSS signal, the performance analysis for the legacy signal providing the same service, is required to determine the performance requirements. However, there are few studies on the secured service (SS) signal performance analysis, and the waveform is the only published information on the signal design component of the SS signal. Therefore, in this paper, we introduce several figures-of-merit (FoMs) that can be used for performance analysis in terms of the waveform. And then, we calculate the FoMs, such as autocorrelation main peak to secondary peak ratio (AMSR), spectral efficiency, Gabor bandwidth, multipath error, and jamming resistance quality factor, for the existing SS signals and discuss the analysis results. Finally, we conclude that the superior waveform for each FoM is different, and that the consideration of the trade-off relationship between the FoMs is required for waveform design.

An Experimental Study on the Secondary Waveform Analysis according to Measure of Electronic Control Waveform (가솔린엔진의 전자제어 센서파형 측정을 통한 점화2차 파형 분석에 관한 실험적 연구)

  • Yoo, Jong-Sik;Kim, Chul-Soo;Cha, Kyoung-Ok
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.19 no.1
    • /
    • pp.95-100
    • /
    • 2011
  • The test was done on cars travelling at speeds of 20km/h, 60km/h and 100km/h, the performance testing mode for chassis dynamometer. In this test, the secondary waveform were measured, including those using faulty MAP sensors, oxygen sensors and spark plugs. The results from these measurements and their analysis of secondary waveform can be summarized as follows: 1) The secondary waveform measured from the faulty oxygen sensor showed a lot of noise around peak voltage and in the rising and falling sections during spark line which means that the air fuel mixture was non-homogeneous. 2) The secondary waveform from the faulty MAP sensor showed the worst shape compared to other sensors, including variation of spark line, state of air-fuel mixture and velocity of flame front. 3) The spark line time of secondary waveform using a faulty spark plug displayed the shortest and smallest energy spark line, which means that a misfire occurred.

An Applicability of Teager Energy Operator and Energy Separation Algorithm for Waveform Distortion Analysis : Harmonics, Inter-harmonics and Frequency Variation

  • Cho, Soo-Hwan;Hur, Jin;Chung, Il-Yop
    • Journal of Electrical Engineering and Technology
    • /
    • v.9 no.4
    • /
    • pp.1210-1216
    • /
    • 2014
  • This paper deals with an application of Teager Energy Operator (TEO) and Energy Separation Algorithm(ESA) to detect and determine various voltage waveform distortions like harmonics, inter-harmonics and frequency variation. Because the TEO and DESA algorithm was initially proposed for speech or communication analysis, its applications are limited to some types of waveform in the power quality analysis area. For example, an undistorted voltage signal is similar with a pure sinusoid. A voltage fluctuation is very similar with an amplitude-modulated signal, from the viewpoint of signal theory. And a continuous frequency variation is similar with a frequency-modulated signal, which is also known as a chirp signal. This paper is written to show that the TEO and DESA algorithm can be used for detecting occurrences of the representative waveform distortions and determining their instantaneous information of amplitude and frequency.

On a Pitch Change of the Waveform Coding by the Cepstrum Analysis of Speech Waveforms (켑스트럼 분석에 의한 파형부호화의 피치변경에 관한 연구)

  • Bae, Myung-Jin;Lee, Mi-Suk
    • The Journal of the Acoustical Society of Korea
    • /
    • v.11 no.4
    • /
    • pp.14-21
    • /
    • 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.

  • PDF

A study on fatigue crack growth with loading waveform and analysis method for all loading waveform at elevated temperature in SUS 304 stainless steel (SUS 304강의 하중파형에 따른 고온피로균열전파속도 및 전체하중파형의 평가방법의 연구)

  • 이상록;이학주;허정원;임만배
    • Journal of Ocean Engineering and Technology
    • /
    • v.6 no.1
    • /
    • pp.122-130
    • /
    • 1992
  • The effect of loading waveform on elevated temperature low-cycle fatigue crack growth behavior in a SUS 304 stainless steel have been investigated under symmetrical trangular (fast-fast), trapezoidal and asymmetrical(fast-slow, slow-fast) waveforms at 650.deg. C. It was found that the crack growth rate in fast-slow loading waveform appeared to be higher a little and the crack growth rate in slow-fast loading waveform much higer than that in fast-fast loading waveform, and difference in crack growth rate between fast-show and slow-fast waveforms nearly didn't appear in the region of da/dN>10/sup -2/ The crack growth rate in the trapezoidal loading waveform with t/sub h/=500sec appeared to be faster than that in slow(500sec)-fast(1sec). In addition, parameter modified J-integral could be considered as useful parameter for fatigue crack growth rate in all waveforms. The result obtained are as follow. da/dN=4.91*10/sup -3/ (.DELTA. J/sub c/)/sup 0.565/.

  • PDF

Spatiotemporal Analysis of Retinal Waveform using Independent Component Analysis in Normal and rd/rd Mouse (독립성분분석을 이용한 정상 마우스와 rd/rd 마우스 망막파형의 시공간적 분석)

  • Ye, Jang-Hee;Kim, Tae-Seong;Goo, Yong-Sook
    • Progress in Medical Physics
    • /
    • v.18 no.1
    • /
    • pp.20-26
    • /
    • 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.

  • PDF