A NOVEL BCG SENSOR-ARRAY FOR UNOBTRUSIVE CARDIAC MONITORING

Unobtrusive heart rate monitoring is a popular research topic in biomedical engineering. The reason is that convential methods, e.g. the clinical gold standard electrocardiography, require conductive contact to the human body. Other methods such as ballistocardiography try to record these vital signs without electrodes that are attached to the body. So far, these systems cannot replace routine procedures. Most systems have some drawbacks that cannot be compensated, such as aging of the sensor materials or movement artifacts. In addition, the signal form differs greatly from an ECG, which is an electrical signal. The ballistocardiogram has a mechanical source, which makes it harder to evaluate. We have developed a new sensor array made of near-IR-LEDs to record BCGs. IR-sensors do not age in relevant time scales. Analog filtering was neccesary, because the signal amplitude was very small. The digitized data was then processed by various algorithms to extract beat-to-beat or breath-to-breath intervals. The redundancy of multiple BCG channels was used to provide a robust estimation of beat-to-beat intervals and heart rate. We installed the system beneath a mattress topper of a hospital bed, but any other bed would have been sufficient. The validation of this measurement system shows that it is well suited for BCG recordings. The use of multiple channels has proven to be superior to relying on a single BCG channel

ТОВАРИСЬКИЙ ГУРТОК ІНЖЕНЕРІВ КАТЕРИНОСЛАВСЬКОГО РАЙОНУ: СТВОРЕННЯ, ВІДКРИТТЯ Й ПЕРШІ РОКИ ДІЯЛЬНОСТІ (1908-1910 РР.)

Досліджено історію створення та відкриття Товариського гуртка інженерів Катеринославського регіону (ТГІКр).(ТГІКр).; The history of creation and opening of Yekaterinoslav engineers group (YEG) is investigated

QUANTIFICATION OF RESPIRATORY SINUS ARRHYTHMIA WITH HIGH-FRAMERATE ELECTRICAL IMPEDANCE TOMOGRAPHY

Respiratory Sinus Arrhythmia, the variation in the heart rate synchronized with the breathing cycle, forms an interconnection between cardiac-related and respiratory-related signals. It can be used by itself for diagnostic purposes, or by exploiting the redundancies it creates, for example by extracting respiratory rate from an electrocardiogram (ECG). To perform quantitative analysis and patient specific modeling, however, simultaneous information about ventilation as well as cardiac activity needs to be recorded and analyzed. The recent advent of medically approved Electrical Impedance Tomography (EIT) devices capable of recording up to 50 frames per second facilitates the application of this technology. This paper presents the automated selection of a cardiac-related signal from EIT data and quantitative analysis of this signal. It is demonstrated that beat-to-beat intervals can be extracted with a median absolute error below 20 ms. A comparison between ECG and EIT data shows a variation in peak delay time that requires further analysis. Finally, the known coupling of heart rate variability and tidal volume can be shown and quantified using global impedance as a surrogate for tidal volume

Modeling and researching the process of plasmachemical recycling of oil wastes based on polychlorinated biphenyls

Theses represents results on thermodynamic simulation of plasmachemical recycling of dielectric oil wastes in air plasma in form of water-organic compositions having optimal composition, lower calorific value minimum 8,4 MJ/kg and adiabatic combustion temperature minimum 1200 °С

Accelerometer-assisted PPG Measurement During Physical Exercise Using the LAVIMO Sensor System

A method is presented for long-term monitoring of vital signs tested during physical exercise. The system is based on reflective photoplethysmography (PPG), whose main component is a micro-optoelectronic sensor. The sensor is sealed within a biocompatible otoplastic housing so that it can be placed in the external auditory canal. The electronic device has a Bluetooth connection which enables to record/visualize the PPG signal on a personal computer or SmartPhone. This technology was tested indoors with a subject running on a treadmill at different speeds. The PPG signal was recorded together with an ECG used as a reference, and with an accelerometer to monitor and record motor activity. Theaccelerometer data were later used to reduce motion artifacts in the PPG signal. The results show that the system has potential to monitor cardiac activity at moderate speed (up to 4 km/h), but with increasing speed (i.e. running) the motion artifacts dominate the PPG. Therefore, additional studies on signal processing are needed to actively reduce motion artifacts, including the accelerometer data

Determining the orientation parameters using the mems accelerometer and magnetometer

Для определения положения объекта на поверхности Земли наибольшее распространение получили географические координаты, с помощью которых можно наблюдать ориентацию и навигацию объекта. Информация об ориентации объекта в пространстве является основополагающей для задач навигации этого объекта на Земле [2]. В географической системе координат задача ориентации понимается как определение углового положения относительно горизонтальной плоскости и направления на север. Одним из самых известных устройств, используемых для определения углового положения объекта относительно направления на магнитный север, является магнитный компас. В этой работе будет рассмотрен современный электронный компас, основанный на тр?хосных МЭМС акселерометре и магнетометре.This article describes the temperature control system for a downhole tool. The peculiarity of this system isthat it is using a heater and an active cooler which are controlled by pulse width modulation. The basis of such asystem is taken from the thermostatic scheme of the inclinometer IGN 100-100 / 60-A. However, this scheme hasserious drawback - conducted interference. These disturbances affect the operation of a downhole power supply,and therefore the entire electronic inclinometer instrumentation. This article briefly describes the principle of thetemperature control system. Furthermore, reasons for this interference are discussed in detail, calculated the valueof failures in the selection of power, the graphs clearly show the changes in the signal. The problematic elements ofthe scheme, affecting the appearance of interference, are identified. The possible solutions to eliminate thisinterference are analyzed, stating the shortcomings of each of the solutions