• 제목/요약/키워드: Pulse rate

검색결과 1,694건 처리시간 0.023초

맥파의 주기 검출 성능 개선에 관한 연구 (A Study on Performance Enhancement of Period Detection in Pulse Wave)

  • 이현민;김동준
    • 전기학회논문지
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    • 제58권6호
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    • pp.1194-1199
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    • 2009
  • Heart rate may be a very important parameter in human health. To extract heart rate, the electrocardiogram(ECG) is commonly used. But the ECG acquisition procedure is very complex. On the other hand, the acquisition of pulse wave or photoplethysmogram(PPG) is very easy. However, the peak of PPG is not so sharp as ECG. This study tries to enhance the performance of peak detection in PPG signal. The method uses the average slopes around the main peak. The crossing point of the increasing and the decreasing slopes is selected as the peak point of heart rate period. The proposed method showed smoothed heart rate graph and reduced irregularity in heart rate values.

Multi-Rate and Multi-BEP Transmission Scheme Using Adaptive Overlapping Pulse-Position Modulator and Power Controller in Optical CDMA Systems

  • Miyazawa Takaya;Sasase Iwao
    • Journal of Communications and Networks
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    • 제7권4호
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    • pp.462-470
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    • 2005
  • We propose a multi-rate and multi-BEP transmission scheme using adaptive overlapping pulse-position modulator (OPPM) and optical power controller in optical code division multiple access (CDMA) networks. The proposed system achieves the multi-rate and multi-BEP transmission by accommodating users with different values of OPPM parameter and transmitted power in the same network. The proposed scheme has advantages that the system is not required to change the code length and number of weight depending on the required bit rate of a user and the difference of bit rates does not have so much effect on the bit error probabilities (BEPs). Moreover, the difference of transmitted powers does not cause the change of bit rate. We analyze the BEPs of the four multimedia service classes corresponding to the com­binations of high/low-rates and low/high-BEPs and show that the proposed scheme can easily achieve distinct differentiation of the service classes with the simple system configuration.

2종류의 양말착의행동이 인체생리반응에 미치는 효과 (Effects of Two Kifferent Kinds of Socks on Physiologrical Responses)

  • 김희은;권오경
    • 한국의류학회지
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    • 제23권2호
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    • pp.242-249
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    • 1999
  • The purpose of this study was to investigate two different kinds of socks on physiological responses at an ambient temperature of 35$\pm$1$^{\circ}C$ and relative humidity of 50$\pm$5% Five healthy women wearing normal socks or toes socks participated as the subjects. Rectal temperature skin temperatures sweat rate blood pressure pulse rate and questionnaire wee measured. Rectal temperature skin temperature sweat rate blood pressure pulse rate and questionnaire were measured. Rectal temperature and mean skin temperature were lower after exercise at wearing toes socks . Sweat rate was higher at wearing normal socks and blood pressure and pulse rate were tend to higher at wearing toes socks. Thermal comfort temperature sensation and humidity sensation were better wearing toes socks. Thermal comfort temperature sensation and humidity sensation were better wearing toes socks than wearing normal socks but wearing comfort was better at wearing normal socks. These results will be discussed form the viewpoint of thermoregulation AVA(Arterio venous Anastomosis) and count current heat exchange.

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샘플링율이 맥박변이도 시간 및 주파수 영역 분석에 미치는 영향 (An Effect of Sampling Rate to the Time and Frequency Domain Analysis of Pulse Rate Variability)

  • 양윤라;신항식
    • 전기학회논문지
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    • 제65권7호
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    • pp.1247-1251
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    • 2016
  • This study aims to investigate the effect of sampling frequency to the time domain and frequency domain analysis of pulse rate variability (PRV). Typical time domain variables - AVNN, SDNN, SDSD, RMSSD, NN50 count and pNN50 - and frequency domain variables - VLF, LF, HF, LF/HF, Total Power, nLF and nHF - were derived from 7 down-sampled (250 Hz, 100 Hz, 50 Hz, 25 Hz, 20 Hz, 15 Hz, 10 Hz) PRVs and compared with the result of heart rate variability of 10 kHz-sampled electrocardiogram. Result showed that every variable of time domain analysis of PRV was significant at 25 Hz or higher sampling frequency. Also, in frequency domain analysis, every variable of PRV was significant at 15 Hz or higher sampling frequency.

5단계 가압 맥파측정에 의한 연령별 혈관 경화도 분석 (Analysis of Arterial Stiffness by Age Using Pulse Waveform Measurement of 5-levels Graded Pressure)

  • 권선민;강희정;임윤경;이용흠
    • Korean Journal of Acupuncture
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    • 제27권2호
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    • pp.107-120
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    • 2010
  • Objectives : The aim of this study is to measure pulse waveforms by applying 5-level graded pressure, and selecting optimum pulse waveforms. Also to proposing the possibility of using AW(Area of the 1/3 upper height of h1) rate in respect to AT(Total Area) for risk assessment of hypertension or arteriosclerosis is another aim of the study. Methods : Pulse waveforms of normotensive were measured by 5-level graded pressure. The pulse waveforms well reflecting properties of blood vessel(having the largest h1) were selected for optimum pulse waveforms. Various parameters(h-parameter, t-parameter, and others) of optimum pulse waveforms were analyzed. AIx(Augmentation index) was calculated by height-parameters to assess arterial stiffness. The area rate of the 1/3 upper height for h1 in respect to total area was analyzed according to aging. Results : According to aging 1. in height-parameter, h2 and h3 were increased but h5 was decreased. 2. In time-parameter, t2, t3, and t5 were getting short. 3. Area of systolic period was increased, and that of diastolic period decreased. 4. AIx rose by aging. 5. AW was significantly increased despite no changes in AT. Conclusions : By analyzing optimum pulse waveforms of 5-level graded pressure method, we could complement weakness of single graded pressure method. Also, possibility of applying the AW rate to risk assessment of hypertension or arteriosclerosis was confirmed in normotensive population which might not be assessed by AIx.

이중 모드 ADC를 이용한 U-Health 시스템용 맥박수와 맥박파형 검출 회로 설계 (Design of a Readout Circuit of Pulse Rate and Pulse Waveform for a U-Health System Using a Dual-Mode ADC)

  • 신영산;위재경;송인채
    • 전자공학회논문지
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    • 제50권9호
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    • pp.68-73
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    • 2013
  • 본 논문에서는 수면 중에 사용자의 건강상태를 모니터링 하기 위한 U-health 시스템으로 맥박 수와 맥박 파형 검출 회로를 제안하였다. 제안된 검출 회로의 출력은 배터리의 교체 없이 장시간 사용하기 위하여 건강 상태에 따라 맥박 수 또는 맥박 파형이 선택된다. 이러한 동작을 위해 제안된 신호 검출 회로는 ADC 모드 또는 카운트 모드로 동작하는 이중 모드 ADC와 간단한 디지털 로직으로 구성된 판별기를 사용하였다. 우선 초기에는 카운트 모드로 동작하는 이중 모드 ADC를 통해 4초 동안의 맥박 수를 검출한다. 검출된 맥박수는 판별기에서 1분간 누적한 뒤 건강 상태를 판별한다. 건강 이상 등으로 맥박 수가 설정된 정상 범위를 벗어난 경우 이중 모드 ADC는 ADC 모드로 동작하며 맥박 파형을 1kHz의 샘플링 주파수로 10bit의 디지털 데이터로 변환한다. 데이터는 버퍼에 저장하였다가 620kbps의 속도로 RF Tx를 통해 단말기로 전송한다. 이때 RF Tx는 모드에 따라 1분 혹은 1ms 간격으로 동작한다. 제안된 신호 검출 회로는 $0.11{\mu}m$ 공정으로 설계하였으며 $460{\times}800{\mu}m^2$의 면적을 차지한다. 측정결과 제안된 검출 회로는 1V의 동작 전압에서 카운트 모드에서는 $161.8{\mu}W$, ADC 모드에서는 $507.3{\mu}W$의 전력을 소모한다.

Multi-coded Variable PPM for High Data Rate Visible Light Communications

  • Moon, Hyun-Dong;Jung, Sung-Yoon
    • Journal of the Optical Society of Korea
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    • 제16권2호
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    • pp.107-114
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    • 2012
  • In this paper, we propose a new modulation scheme called multi-coded variable pulse position modulation (MC-VPPM) for visible light communication systems. Two groups of signals (Pulse Width Modulation (PWM) and Pulse Position Modulation (PPM) groups) are multi-coded by orthogonal codes for transmitting data simultaneously. Then, each multi-level value of the multi-coded signal is converted to pulse width and position which results in not only an improved data rate, but also a processing gain in reception. In addition, we introduce average duty ratio and cyclic shift concepts in PWM through which dimming control for light illumination can be supported without any degradation in communication performance. Through simulation, we confirm that the proposed MC-VPPM shows a comparable BER curve and much greater achievable data rate than the conventional VPPM scheme using a visible light optical channel environment.

A Study on Database for Pulse Rate Diagnosis

  • S. C. Han;Kim, H. K.;Lee, Y. D.;W. Huh;Park, Y. B.
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 1998년도 춘계학술대회 논문집
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    • pp.539-542
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    • 1998
  • In this paper, we devised pulse rate diagnosis database system for provide basic index of Cold-Hot diagnosis. The system consist of database part and pulse rate detection part that for detection pulse wave, respiration and ECG. The database is constructed windows95 platform using DAO(Data Access Object). Search algorithm used ISAM algorithm. The database consist of patient information and medical report for a subject and detected biological signals.

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Pulse Shaper를 이용한 SHPB 실험 응력파 제어 효과의 해석 및 실험적 검증 (Numerical and Experimental Verification of Stress Wave Control Effect in SHPB Experiment using Pulse Shaper)

  • 김용희;우민아;강범수;김정
    • 소성∙가공
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    • 제26권5호
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    • pp.314-322
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    • 2017
  • In the high-speed forming analysis, dynamic material properties considering a high strain rate are required. The split Hopkinson pressure bar (SHPB) experiment was performed for measuring dynamic material properties under high strain rate. The pulse shaping method was used to improve the accuracy of the SHPB experiment. A pulse shaper attached to the front of the incident bar was used for specimen dynamic stress equilibrium through stress wave control. Numerical analysis and SHPB test were performed to verify whether the pulse shaper affects the dynamic stress equilibrium in copper and Al6061 specimens. The results of SHPB test and numerical analysis show that the pulse shaper contributes to the dynamic stress equilibrium. Based on the improved stress equilibrium using a pulse shaper, the flow stress curves for copper and Al6061 materials were obtained at strain rates of 1344.4/sec and 1291.6/sec, respectively.

고효율 $CO_2$ Laser 개발 연구 : SMPS 방식 펄스형 $CO_2$ Laser의 출력특성 (A Study on the Development of High Efficieny $CO_2$ Laser : Output Characteristics of Pulsed $CO_2$ Laser Using SMPS Method)

  • 정현주;이동훈;남경훈;김도완;정영환;이유수;김희제;조정수
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제48권11호
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    • pp.730-734
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    • 1999
  • In this study, it is the purpose to develope a cheap and compact repetitively pulsed $CO_2$ laser with pulse repetition rate range of 180 Hz. We used a SCR switched power supply as a high voltage pulsed supply, which is cheap and simple comparing to others. PIC one-chip microprocessor was used for precise control of a laser power supply on the control part. And the laser cavity was fabricated as an axial and water cooled type. The laser performance characteristics as various parameters, such as pulse repetition rate and gas pressure have been investigated. The experiment was done under the condition of total pressure of $CO_2, N_2$ and He from 4 Torr to 16 Torr and pulse repetition rate from 4 Hz to 180 Hz. As a result, the maximum average output was about 19.6W at the total pressure of 12 Torr and the pulse repetition rate of 180Hz.

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