Abstract This article focuses on the fabrication and characterization of stretchable interconnects for wearable electronics applications. Interconnects were screen-printed with a silver-polymer composite ink 50-μm thick thermoplastic polyurethane. The initial sheet resistances manufactured an average 36.2 mΩ/◽, half samples withstood single strains up to 74%. strain proportionality resistance is discussed, regression model introduced. Cycling increased resistance. However, here almost fully...

Microwave doppler radar offers significant improvements for unobtrusive heart and respiration measurement. Radar monitoring enables non-contact measurement, through clothing, of rate, which is desired in several applications ranging from medical sleep laboratory measurements to home health care stress monitoring. The use high frequency (>; 10 GHz) instead lower frequencies (~2.4 increases the signal-to-noise-ratio signal utilization commercial modules. However, if used, linear combining...

Accurate, simple and affordable methods for passive indoor tracking of human beings are still missing. In this article, we describe the development an unobtrusive two-dimensional positioning system based on low-frequency electric fields. The system's operation is measuring capacitance between multiple floor tiles a receiving electrode. presented invisible to user uses single-chip solution measure capacitances. implemented evaluated with two different types electrodes results presented. With...

The ongoing revolution of touch‐based user interfaces sets new requirements for touch panel technologies, including the need to operate in a wide range environments. Such panels endure moisture and sunlight. Moreover, they often be curved or flexible. Thus, there is technologies suitable, example, home appliances used kitchen bathroom, automotive applications, e‐paper. In this work, development transparent flexible moist environments reported. A piezoelectric polymer, poly(vinylidene...

Textile electrodes are a new, potential choice for biopotential measurements. In this research different kinds of textile were compared and good measurement positions searched. the first part properties four structurally compared. Three industrially manufactured one was hand-made by embroidering conductive yarn on fabric. Four test persons used testing electrodes. The measurements made three times with all electrode types so that in each skin prepared way. performed predefined set motions...

Accurate displacement measurement using quadrature Doppler radar requires amplitudes and phase imbalance compensation. Previously, this calibration has required cumbersome hardware modifications thus can only be performed in a laboratory setting. Recently, data-based method that does not require been proposed. This simplifies the process allows to on-site periodically. The is called ellipse fitting. In paper, different factors affecting estimation accuracy, namely, arc length, initial angle,...

Proactive, context-aware computing isn't new. In 2000, David Tennenhouse called for a change in the boundary between physical and virtual worlds. He identified proactive as an alternative to interactive defined how future systems should become more involved with real world. also considered control online adaptation especially promising. Today, ambient-intelligence researchers show increasing interest both applications applications. Using different context-recognition methods, can easily...

Wireless implantable devices revolutionize the field of biomedical engineering as soon satisfactory power supplies are conceived. This paper presents a novel ultrasound-based method for powering battery-free electrical implant. Contrary to commonly used RF and inductive methods, ultrasonic transmission helps avoid problems with electromagnetic coupling offers use selection data frequencies not limited by national regulations. The proof-of-concept link is based on piezoelectric crystals....

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper describes a design and implementation of portable physiological signal recorder. The device is designed for measuring electrocardiography, bioimpedance, user's activity. bioimpedance measures the dynamic changes in impedance, its main application monitoring respiration. Activity measured with three-axis acceleration sensor. During design, special attention paid on device's power...

This paper demonstrates the measurement of respiration waveform during sleep with a noncontact radar sensor. Instead measuring only rate, methods that allow monitoring absolute displacement were studied. Absolute can in theory be measured quadrature microwave Doppler sensor and using nonlinear demodulation as channel combining method. However, this paper, relative measures used reference. is first time longer data sets have been analyzed successfully consists whole-night recordings three...

The addition of fillers has been implemented in fused filament fabrication (FFF), and robust carbon have found to improve the mechanical, electrical, thermal properties 3D-printed matrices. However, stretchable matrices, use imposes significant challenges related quality durability. In this work, we show that long staple fibers form permeable fiber cloth (CFC) can be placed into a thermoplastic polyurethane (TPU) matrix system. Four CFC sample series (nominally 53–159-µm-thick layers) were...

New fiber and textile materials miniaturized electronic components make it possible to create truly usable smart clothes. These intelligent clothes are worn like ordinary clothing providing help in various situations according the designed application. This paper describes design implementation of a survival prototype for arctic environment. Concept development, electrical design, non-electrical features, material selection, discussed. Communication positioning aids have been provided suit's...

Based on the results of a 3-year interdisciplinary study, this article presents an approach in which proactive information technology was introduced into homes, and discusses derived design principles from human-centered perspective. The application computing homes will face particularly sensitive conditions, as familiar reliable household elements remain strongly preferred. Since there is considerable resistance towards increase both calm system behaviors degree variety aesthetic designs...

This paper presents a wearable measurement system for patients recovering from hip replacement operation. The system, called HipGuard, is intended to be used at home during the recovery period of eight 12 weeks after surgery. measures posture patient and also monitors load put on operated leg. These measurements help follow precautions given by surgeon. consists seven wireless sensor nodes measuring orientation legs, node informed HipGuard with an audio signal or haptic vibration if position...

In pervasive context recognition and user identification applications, unobtrusive of height posture is difficult. With the current state technology, this becomes even harder in environments where cameras are not desired or allowed. This paper answers problem by presenting a simple, unobtrusive, low-cost system for measuring user. The measurement method based on capacitive coupling low-frequency signals conductivity human body. designed was simulated, implemented, tested with 14 adults....

In smart homes, unobtrusive monitoring of user position and activity are important but challenging tasks. With the current state technology, this task is especially hard to carry out in private areas where video surveillance considered undesira

Purpose The purpose of this paper was to offer more reliable dry electrode materials for long-term measuring and determine how repeated machine washing affects the measured impedance surface resistance sample electrodes. aim manufacture electrodes that could be used measurement ECG. Skin friendly, metal sheet type, a solution. Design/methodology/approach In addition two conventional already in heart rate belts, authors prepared tested three different Three 20-mm-diameter were manufactured...

A communications network for sensors and actuators is an important part in the realization of any smart home or intelligent environment. This paper presents a new protocol specialized environments emphasizing energy efficiency service discovery functionality. Energy has been attained by using device specific low power listening schemes together with minimal number message transactions. was compared to other academic industry protocols found promising use environments. Prototype...

Modern fibre and textile materials miniaturised electronic components enable implementation of smart clothes that enhance or augment the functionality ordinary clothing. Smart together with palm top computers comprise applications have an easy to use user interface. The paper describes design electrically heated clothing prototype. purpose prototype is study possibilities usage temperature range by providing additional electrical heating option. A computer based interface also presented...

The health care costs in developed countries are increasing fast due to the aging of population. In-home monitoring is becoming more and attractive both because expected cost-savings technical development suitable measurement devices wireless sensor networks. In this paper, we present on-going work about embedding into ordinary homes. system targeted for elderly rehabilitation after hospitalization period. paper presents utilized network implementation, chosen set sensors first test trial,...