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Selected Papers from 16th Biennial Baltic Electronics Conference (BEC 2018)

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A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Physical Sensors".

Deadline for manuscript submissions: closed (15 April 2019) | Viewed by 22272

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Special Issue Editor

Dr. Ants Koel

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Guest Editor

Thomas Johann Seebeck, Department of Electronics, Tallinn University of Technology, Estonia
Interests: Numerical simulation and design of sensors and devices - based on wide bandgap semiconductor materials, graphene and lab-on-chip solutions

Special Issue Information

Dear Colleagues,

BEC 2018, the 16th Biennial Conference on Electronics and Embedded Systems, will be held in Tallinn, Estonia, 8–10 October, 2018 (https://www.ttu.ee/bec).

The main topic of the conference is “Cognitive Electronics”. R&D in so-called smart embedded and energy efficient electronics is increasingly important so that such solutions perform adequately, reliably, and securely adapt to changing conditions, meaning that future electronics should have cognitive functions deeply embedded into them. The conference BEC2018 will provide an opportunity to come together and discuss ones recent research work in defined topics of the field at an international forum in Tallinn, Estonia.

Authors of outstanding papers related to sensors presented at the conference are invited to submit extended versions of their work to the Special Issue for publication.

Dr. Ants Koel
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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Published Papers (4 papers)

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Research

14 pages, 3456 KiB

Open AccessArticle

First Principles Simulations of Phenol and Methanol Detector Based on Pristine Graphene Nanosheet and Armchair Graphene Nanoribbons

by Muhammad Haroon Rashid, Ants Koel and Toomas Rang

Sensors 2019, 19(12), 2731; https://doi.org/10.3390/s19122731 - 18 Jun 2019

Cited by 10 | Viewed by 4246

Abstract

Over the last decade graphene based electronic devices have attracted the interest of researchers due to their exceptional chemical, electrical and optical properties. Graphene is very sensitive to any physical changes in its surrounding environment and, inherently, has very low electronic noise. This property of graphene makes it a suitable candidate for sensor applications. The purpose of the work presented in this article is to demonstrate the ability of graphene derivatives to detect toxic organic compounds like phenol and methanol. A novel method for the detection of organic compounds (phenol and methanol) has been introduced in this article. In this method, a change in the photocurrent, as well as electric current, have been used as detection signals to improve the sensor accuracy and selectivity for specific target molecules. A nanoscale electronic device simulator, Quantumwise Atomistix Toolkit (ATK), has been used to simulate graphene nanosheet and armchair graphene nanoribbon based sensors. Devices density of states (DOS), current–voltage curves and photocurrent curves have been calculated with the ATK simulator. In the proximity of target molecules, a significant change in DOS, electric current and photocurrent have been observed. The simulated graphene based structures can be converted into physical sensors to obtain a low cost, small sized, integrated sensing device. Full article

(This article belongs to the Special Issue Selected Papers from 16th Biennial Baltic Electronics Conference (BEC 2018))

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12 pages, 5687 KiB

Open AccessArticle

Bioimpedance Sensor Array for Long-Term Monitoring of Wound Healing from Beneath the Primary Dressings and Controlled Formation of H₂O₂ Using Low-Intensity Direct Current

by Atte Kekonen, Mikael Bergelin, Max Johansson, Narender Kumar Joon, Johan Bobacka and Jari Viik

Sensors 2019, 19(11), 2505; https://doi.org/10.3390/s19112505 - 31 May 2019

Cited by 29 | Viewed by 6659

Abstract

Chronic wounds impose a significant financial burden for the healthcare system. Currently, assessment and monitoring of hard-to-heal wounds are often based on visual means and measuring the size of the wound. The primary wound dressings must be removed before assessment can be done. We have developed a quasi-monopolar bioimpedance-measurement-based method and a measurement system to determine the status of wound healing. The objective of this study was to demonstrate that with an appropriate setup, long-term monitoring of wound healing from beneath the primary dressings is feasible. The developed multielectrode sensor array was applied on the wound area and left under the primary dressings for 142 h. The impedance of the wounds and the surrounding intact skin area was measured regularly during the study at 150 Hz, 300 Hz, 1 kHz, and 5 kHz frequencies. At the end of the follow-up period, the wound impedance had reached the impedance of the intact skin at the higher frequencies and increased significantly at the lowest frequencies. The measurement frequency affected the measurement sensitivity in wound monitoring. The skin impedance remained stable over the measurement period. The sensor array also enabled the administration of periodical low-intensity direct current (LIDC) stimulation in order to create an antimicrobial environment across the wound area via the controlled formation of hydrogen peroxide (H₂O₂). Full article

(This article belongs to the Special Issue Selected Papers from 16th Biennial Baltic Electronics Conference (BEC 2018))

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14 pages, 1828 KiB

Open AccessArticle

Estimation of Heart Rate Recovery after Stair Climbing Using a Wrist-Worn Device

by Daivaras Sokas, Andrius Petrėnas, Saulius Daukantas, Andrius Rapalis, Birutė Paliakaitė and Vaidotas Marozas

Sensors 2019, 19(9), 2113; https://doi.org/10.3390/s19092113 - 7 May 2019

Cited by 18 | Viewed by 6529

Abstract

Heart rate recovery (HRR) after physical exercise is a convenient method to assess cardiovascular autonomic function. Since stair climbing is a common daily activity, usually followed by a slow walking or rest, this type of activity can be considered as an alternative HRR test. The present study explores the feasibility to estimate HRR parameters after stair climbing using a wrist-worn device with embedded photoplethysmography and barometric pressure sensors. A custom-made wrist-worn device, capable of acquiring heart rate and altitude, was used to estimate the time-constant of exponential decay

τ

, the short-term time constant

S

, and the decay of heart rate in 1 min

D

. Fifty-four healthy volunteers were instructed to climb the stairs at three different climbing rates. When compared to the reference electrocardiogram, the absolute and percentage errors were found to be ≤ 21.0 s (≤ 52.7%) for

τ

, ≤ 0.14 (≤ 19.2%) for

S

, and ≤ 7.16 bpm (≤ 20.7%) for

D

in 75% of recovery phases available for analysis. The proposed approach to monitoring HRR parameters in an unobtrusive way may complement information provided by personal health monitoring devices (e.g., weight loss, physical activity), as well as have clinical relevance when evaluating the efficiency of cardiac rehabilitation program outside the clinical setting. Full article

(This article belongs to the Special Issue Selected Papers from 16th Biennial Baltic Electronics Conference (BEC 2018))

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28 pages, 11337 KiB

Open AccessArticle

Multichannel Electrical Impedance Spectroscopy Analyzer with Microfluidic Sensors

by Jaan Ojarand, Mart Min and Ants Koel

Sensors 2019, 19(8), 1891; https://doi.org/10.3390/s19081891 - 20 Apr 2019

Cited by 15 | Viewed by 4503

Abstract

Impedance spectroscopy is a common approach in assessing passive electrical properties of biological matter. However, several problems appear in microfluidic devices in connection with the requirement for high sensitivity of signal acquisition from small volume sensors. The developed compact and inexpensive analyzer provides impedance spectroscopy measurement from three sensors, both connected in direct and differential modes. Measurement deficiencies are reduced with a novel design of sensors, measurement method, optimized electronics, signal processing, and mechanical design of the analyzer. Proposed solutions are targeted to the creation of reliable point-of-care (POC) diagnostic and monitoring appliances, including lab-on-a-chip type devices in the next steps of development. The test results show the good working ability of the developed analyzer; however, also limitations and problems that require attention and further improvement are appointed. Full article

(This article belongs to the Special Issue Selected Papers from 16th Biennial Baltic Electronics Conference (BEC 2018))

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Selected Papers from 16th Biennial Baltic Electronics Conference (BEC 2018)

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