• 제목/요약/키워드: Pulse rate

검색결과 1,694건 처리시간 0.028초

홀센서 집게형 맥진기 요골동맥파에 FFT를 적용한 호흡수 추출 연구 (Extraction of Respiratory Rate by using FFT for Radial Artery Pulse Waves Acquisited by Clip-type Pulsimeter with a Hall Sensor)

  • 조현성;이상석
    • 한국자기학회지
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    • 제22권5호
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    • pp.178-182
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    • 2012
  • 영구자석과 반도체 홀센서가 구비된 집게형 맥진기로 얻은 맥진파형에 고속 푸리에변환(FFT)을 적용하여 생체신호인 호흡수를 추출하였다. 추출된 호흡수는 맥진파형의 형태가 항상 변화하는 요인에 의존하는 심장의 운동에 대한 오차까지 고려하였다. 인위적인 호흡수 템포 15, 20, 30, 40, 50에 각각 측정한 맥진파형의 FFT 스펙트럼에서 피크값과 일치하는 주파수 0.125 Hz, 0.16 Hz, 0.25 Hz, 0.33 Hz, 0.41 Hz와 일치하였다. 100 s, 200 s, 300 s 동안 얻은 맥진파형 데이터에서 호흡성분 추출 알고리즘을 적용한 결과, 시간이 긴 300 s에서 FFT 스펙트럼 피크가 가장 크게 뾰쪽해지는 결과를 얻었다. 집게형 맥진기가 인체의 물리적인 영향을 주는 호흡수를 추출해 내는데 유용한 기기임을 확인하였다.

영구자석과 홀소자로 구비된 집게형 맥진기를 이용한 맥진파형 측정과 분석 (Measurement and Analysis of Pulse Wave using Clip Type Pulsimeter Equipped with a Permanent Magnet and a Hall Device)

  • 손일호;이상석
    • 한국자기학회지
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    • 제21권3호
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    • pp.104-107
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    • 2011
  • 비가압 상태에서 정확하게 측정한 맥진파형 신호를 얻기 위하여 영구자석과 홀소자로 구비된 안정시 휴대성이 가능한 집게형 맥진기 시제품을 개발하였다. 소형 영구 자석 1개 위치 변화로 얻은 요골동맥 맥진 파형의 4가지 중요 상관인자인 주기, 수축시간, 반사파시간, 절흔 시간들을 결정하여 5초간 수집한 실험값들을 서로 비교 분석하였다. 집게의 스프링에서 누르는 일정 압력을 사용해 가압 느낌 없이 재현성 있는 맥박수 및 혈압 측정함으로써 홀소자 집게형 맥진기 개발이 가능함을 보여주었다.

Remote Monitoring of Patients and Emergency Notification System for U-Healthcare

  • Lee, Jun;Jang, Hyun-Se;Yang, Tae-Kyu;Seo, Yong-Ho
    • International journal of advanced smart convergence
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    • 제2권1호
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    • pp.1-5
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    • 2013
  • This study proposes a remote monitoring of patients and emergency notification system with a camera and pulse wave sensor for U-Healthcare. The proposed system is a server client model based U-Healthcare system which consists of wireless clients that have micro-controller, embedded-board for patient status monitoring and a remote management server. The remote management server observes the change of pulse wave data individually in real-time sent from the clients that is to be remote-monitored based on the pulse wave data stored by users and divides them into caution section and emergency section. When the pulse wave data of a user enters an emergency situation, the administrator can make a decision based on the real-time image information and pulse rate variability. When the status of the monitored patient enters the emergency section, the proposed U-healthcare system notifies the administrator and relevant institutions. An experiment was conducted to demonstrate the pulse wave recognition of the proposed system.

폐수 처리용 고전압 나노 펄스 발생기 (High Voltage Nano-Pulse Generator for Industrial Waste Water Treatment)

  • 장성덕;손윤규;오종석;권오정
    • 한국산업융합학회 논문집
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    • 제4권3호
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    • pp.311-318
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    • 2001
  • The application of a pulsed power system is being extended to a environmental and industrial fields. The non-dissolution waste water pollutants from industrial plants can be processed by applying high voltage pulses with a fast rising time (a few nanoseconds) and short duration (nano to microseconds) in a pulsed corona discharge reactor. The nano-pulse generator with a magnetic switch has been developed. Its corona current in load can be adjusted by pulse width and repetition rate. we investigated the performance of the nano-pulse generator using the dummy load which is composed of resistor and capacitor equivalent to the actual reactor. This paper descibes the electrical characteristics of the nano-pulse generator that produces a 300 ns pulse at maximum repetition rate of 400 pps with a voltage of 40 kV across a $640{\Omega}$ load. In this paper we briefly discuss a configuration of system and test results.

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맥진을 이용한 사상체질 판별 방법의 개선 및 의의 (Improvement and Limitations in the Sasang Constitution Diagnosis by the Instrument-based Pulse Diagnosis)

  • 김재욱;김성훈;이유정;전영주;김근호;김종열
    • 한국한의학연구원논문집
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    • 제15권2호
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    • pp.93-100
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    • 2009
  • Recently, there have been emerging research activities in classifying the Sasang constitution objectively by machine-based methods. The concordance rate of the classification by the pulse wave features was, however, only around 50% up to now. In this paper, we introduce a novel classification algorithm that can promote the accuracy substantially at the expense of the non-classifiable subgroup as a byproduct. For instance, with the pulse wave features alone, we show that female/male subject group in their 20s can be classified into the Sasang constitution group with the concordance rate of 68.4%/65.5% for a subgroup of 57/29(31%/15%) subjects out of 184/195, by leaving the other subjects as the non-classifiable group. Next, we show that the pulse diagnosis has been used only as a supportive tool in determining one's constitution, and consequently the accuracy of the concordance ratio by the pulse wave features alone cannot exceed a finite value, which we estimate to be about 60%.

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초고속 OTDM/WDM을 위한 파장 및 반복율 가변 광 펄스 발생 (Wavelength and Repetition-Rate Tunable Optical Pulse Generation for Ultrafast OTDM/WDM)

  • 최경선;한종민;서동선;전영민;이석
    • 전기전자학회논문지
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    • 제5권2호
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    • pp.201-210
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    • 2001
  • 광 시분할 및 파장분할 다중화에 의한 초고속 광통신 시스템에 적합한 파장 및 반복율 가변 능력을 갖는 초단 펄스열을 고리형 반도체 광섬유 레이저의 광주입 모드잠김에 의해 발생시켰다. 발생된 광 펄스열은 10 GHz, 20 GHz, 30 GHz, 및 40 GHz의 다양한 반복율에서 ${\sim}10$ 피코초 정도의 펄스폭과 30 nm가 넘는 파장 가변능력을 보였다.

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Transition-limited pulse-amplitude modulation technique for high-speed wireline communication systems

  • Eunji Song;Seonghyun Park;Jaeduk Han
    • ETRI Journal
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    • 제45권6호
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    • pp.974-981
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    • 2023
  • This paper presents a transition-limited pulse-amplitude modulation (TLPAM) signaling method to enable a high data rate and robust wireline communications. TLPAM signaling addresses the impact of high intersymbol interference (ISI) ratios in conventional M-ary PAM signaling methods by limiting the maximum voltage transition level between adjacent symbols. The implementation of a TLPAM signaling encoder is realized by setting back the most significant bits (MSBs) in the queue. The correlation between TLPAM's maximum transition level, effective data rate, and eye width/height is analyzed with various channel loss parameters, followed by characterization and measurement results with a realistic channel setup. The analysis and experimental results reveal the effectiveness of the proposed TLPAM signaling scheme for achieving a high data rate with minimal interference.

봉약침 자극이 사상체질별 건강인의 심박변이도, 맥파, 뇌혈류에 미치는 영향 (Effects of bee venom acupuncture on heart rate variability, pulse wave, and cerebral blood flow for types of Sasang Constitution)

  • 이상민;김구;오승윤;권영미;주종천
    • 대한약침학회지
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    • 제12권1호
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    • pp.35-42
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    • 2009
  • 1. Objectives To evaluate effects of bee venom acupuncture on cardiovascular system and differences according to each constitution. 2. Methods Heart rate variability, pulse wave and the velocity of cerebral blood flow were measured before bee venom acupuncture(BVA), right after and after 30 minuets, had been applied to 20 subjects. 3. Results 1. BVA did not have effects on measurement variables of heart rate variability. 2. BVA had effects on pulse wave, showing total time, radial augmentation index up and height of percussion wave, time to percussion wave, sum of pulse pressure down. 3. BVA did not have effects on the cerebral blood flow velocity when considering not Sasang Constitution. 4. Considering Sasang Constitution, BVA demonstrates different responses in time to preincisura wave, mean blood flow velocity, peak systolic velocity and end diastolic velocity. 4.Conclusion From those results, the following conclusions are obtained. Cause BVA alters pulse wave and makes differences in the cerebral blood flow velocity according to Sasang Constitution. Various methods of BVA treatment are needed considering Sasang Constitution.

촬상소자를 이용한 맥동의 2차원 계측 (2-dimensional Measurement of Arterial Pulse by Imaging Devices)

  • 김기왕
    • 대한한의진단학회지
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    • 제12권2호
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    • pp.8-17
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    • 2008
  • Objectives: For the traditional pulse diagnosis in Oriental Medicine, not only the pulse shape in time domain, but the width, length and depth of arterial pulse also should be measured. However, conventional pulse diagnostic systems have failed to measure the spatial parameters of the arterial pulse e.g. effective length of arterial pulse in the wrist. In fact, there are many ways to measure that kind of spatial features in arterial pulsation, but among them, the method using image sensor provides relatively cheap and simple way, therefore I tested feasibility of measuring 2-dimensional pressure distribution by imaging devices. Methods: Using widely used PC cameras and dotted balloons, the subtle oscillation of skin over the radial artery was recorded continuously, and then the displacement of every dot was calculated. Consequently, the time course of that displacements shows arterial pulse wave. Results: By the proposed method I could get pressure distribution map with 30Hz sampling rate, 21steps quantization resolution, and approximately 1mm spatial resolution. With reduced quantization resolution, $3cm{\times}4cm$ view angle could be achieved. Conclusion: Although this method has some limitations, it would be useful method for detecting 2-dimensional features of arterial pulse, and accordingly, this method provides a novel way to detect 'narrow pulse', 'wide pulse', 'long pulse', 'short pulse', and their derivatives.

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3 Stage 2 Switch Application for Transcranial Magnetic Stimulation

  • Ha, Dong-Ho;Kim, Whi-Young;Choi, Sun-Seob
    • Journal of Magnetics
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    • 제16권3호
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    • pp.234-239
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    • 2011
  • Transcranial magnetic stimulation utilizes the method of controlling applied time and changing pulse by output pulse through power density control for diagnosis purposes. Transcranial magnetic stimulation can also be used in cases where diagnosis and treatment are difficult since output pulse shape can be changed. As intensity, pulse range, and pulse shape of the stimulation pulse must be changed according to lesion, the existing sine wave-shaped stimulation treatment pulse poses limitations in achieving various treatments and diagnosis. This study actualized a new method of transcranial magnetic stimulation that applies a 3 Stage 2 Switch( power semiconductor 2EA) for controlling pulse repetition rate by achieving numerous switching control of stimulation coil. Intensity, pulse range, and pulse shape of output can be freely changed to transform various treatment pulses in order to overcome limitations in stimulation treatment presented by the previous sine wave pulse shape. The method of freely changing pulse range by using 3 Stage 2 Switch discharge method is proposed. Pulse shape, composed of various pulse ranges, was created by grafting PFN (Pulsed Forming Network) through AVR AT80S8535 one-chip microprocessor technology, and application in transcranial magnetic stimulation was achieved to study the output characteristics of stimulation treatment pulse according to delaying time of the trigger signal applied in section switch.