Wyniki wyszukiwania dla: BLOOD PRESSURE, PULSE TRANSIT TIME, NONINVASIVE MEASUREMENTS, SAMPLING FREQUENCY, LOW PASS FILTER

• Blood Pressure - Pulse Transit Time Relationships: Comparative Studies

  Publikacja

  • A. Poliński
  • A. Bujnowski
  • T. Kocejko
  • J. Wtorek

  - Rok 2020

  A non-invasive and continuous blood pressure estimation could allow a better diagnosis and an earlier detection of various diseases. It could be performed using a photoplethysmography. However, it requires that a relation between blood pressure and pulse transit time is known. Eleven theoretical formulas were used in obtaining the simulated and noise free synthetic data. Then, they were utilized in validation of three, commonly...

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• Continuous blood pressure monitoring by photoplethysmography - signal preprocessing requirements based on blood flow modelling

  Publikacja

  • A. Poliński

  - PHYSIOLOGICAL MEASUREMENT - Rok 2023

  Objective. The aim of the study is to investigate the effect of the signal sampling frequency and low-pass filtering on the accuracy of the localisation of the fiducial points of the photoplethysmographic signal (PPG), and thus on the estimation of the blood pressure (i.e. the accuracy of the estimation). Approach. Statistical analysis was performed on 3,799 data samples taken from a publicly available database. Four PPGfiducial...

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• Can we rely on the pulse transit time - pressure relationship - models comparison

  Publikacja

  • A. Poliński
  • A. Bujnowski
  • T. Kocejko
  • J. Wtorek

  - Rok 2019

  An unobtrusive, noninvasive and continuous pressure measurement is invaluable however, still being under research and development. There are many attempts proposing an appropriate relationship between pulse pressure velocity and pressure. Fifteen different formulas, both theoretical and experimental, describing relation between blood pressure and crosssectional area of the vessel were examined. Using these formulas the relation...

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• BLOOD PRESSURE

  Czasopisma

  ISSN: 0803-7051 , eISSN: 1651-1999

• Dynamic mass measurement in checkweighers using a discrete time-variant low-pass filter

  Publikacja

  • P. Pietrzak
  • M. Meller
  • M. Niedźwiecki

  - MECHANICAL SYSTEMS AND SIGNAL PROCESSING - Rok 2014

  Conveyor belt type checkweighers are complex mechanical systems consisting of a weighing sensor (strain gauge load cell, electrodynamically compensated load cell), packages (of different shapes, made of different materials) and a transport system (motors, gears, rollers). Disturbances generated by the vibrating parts of such a system are reflected in the signal power spectra in a form of strong spectral peaks, located usually in...

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• A Meta-Analysis of Pulse Arrival Time Based Blood Pressure Estimation

  Publikacja

  • A. Poliński
  • M. Pietrewicz
  • T. Kocejko
  • A. Bujnowski
  • J. Rumiński
  • J. Wtorek

  - Rok 2018

  The paper presents a preliminary meta-analysis of the sample correlation between pulse arrival time (PAT) and blood pressure (BP). The aim of the study was to verify sample correlation coefficient between PAT and BP using an affine model BP = a · P AT + b for systolic and diastolic blood pressure. The databases included in the search were the IEEE Xplore Digital Library, Springer Link and Google Scholar. Only papers from 2005 to...

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• Influence of preprocessing techniques on pulse pressure velocity determination

  Publikacja

  • A. Poliński
  • A. Bujnowski
  • T. Kocejko
  • J. Wtorek

  - Rok 2021

  Pulse Wave Velocity (PWV) is measured and utilized in many clinical applications. Recently, a wide research has been led to develop a cuff-less and continuous blood pressure method basing on PWV. However, in this application a decision on choosing an appropriate fiducial point of pulse wave (PW) waveform is necessary and substantial. It would allow to measure time parameters necessary to determine PWV. An influence of sampling...

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• A 0.5 V Nanowatt Biquadratic Low-Pass Filter with Tunable Quality Factor for Electronic Cochlea Applications

  Publikacja

  • J. Jakusz
  • W. Jendernalik

  - Electronics - Rok 2024

  A novel implementation of an analogue low-power, second-order, low-pass filter with tunable quality factor (Q) is presented and discussed. The filter feature is a relatively simple, buffer-based, circuit network consisting of eleven transistors operating in a subthreshold region. Q tuning is accomplished by injecting direct current into a network node, which changes the output resistance of the transistors and, as a result, modifies...

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• Novel topology of compact coplanar waveguide resonant cell low-pass filter

  Publikacja

  • P. Kurgan
  • A. Bekasiewicz
  • M. Pietras
  • M. Kitliński

  - MICROWAVE AND OPTICAL TECHNOLOGY LETTERS - Rok 2012

  In this study, a novel pseudoelliptic function low-pass filter (LPF) constituted by a compact coplanar waveguide resonant cell has been designed and manufactured. The lumped-element seven-pole prototype has been adequately realized by using complementary perturbations located both in signal line and ground plane metallization. The fabricated uniplanar LPF offers a compact size of 5.6 x 9.8 mm2, return loss better than 26 dB over...

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• Frequency-dependent coupling model for microwave band-pass filter

  Publikacja

  • A. Jędrzejewski
  • Ł. Szydłowski

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Rok 2011

  The goal of this work was to create a circuit model which represents frequency-dependent coupling between microwave resonators. Our models are designed for in-line filters. The frequency-dependent coupling enables one to realize a transmission zero which is not possible in classical approach with frequency independent inverters. In addition, the proposed model allows us to observe out-of-band behavior, e.g. spurious resonance....