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Publications (10 of 88) Show all publications
Redzwan, S., Asan, N. B., Velander, J., Ebrahimizadeh, J., Perez, M. D., Mattsson, V., . . . Augustine, R. (2019). Analysis of Thickness Variation in Biological Tissues using Microwave Sensors for Health Monitoring Applications. IEEE Access, 7, 156033-156043
Open this publication in new window or tab >>Analysis of Thickness Variation in Biological Tissues using Microwave Sensors for Health Monitoring Applications
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2019 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 156033-156043Article in journal (Refereed) Published
Abstract [en]

Microwave sensing technique is a possible and attractive alternative modality to standard Xrays,magnetic resonance imaging, and computed tomography methods for medical diagnostic applications.This technique is beneficial since it uses non-ionizing radiation and that can be potentially used for themicrowave healthcare system. The main purpose of this paper is to present a microwave sensing techniqueto analyze the variations in biological tissue thickness, considering the effect of physiological and biologicalproperties on microwave signals. With this goal, we have developed a two-port non-invasive sensor systemcomposed of two split ring resonators (SRRs) operating at an Industrial, Scientific, and Medical frequencyband of 2.45 GHz. The system is verified using the amplitude and phase of the transmitted signal in ex-vivomodels, representing different tissue thicknesses. Clinical applications such as the diagnosis of muscularatrophy can be benefitted from this study.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-392816 (URN)10.1109/ACCESS.2019.2949179 (DOI)000497165400059 ()
Funder
Vinnova, 2015-04159Swedish Research Council, 2017-04644EU, Horizon 2020, 824984Swedish Foundation for Strategic Research , RIT170020
Available from: 2019-09-10 Created: 2019-09-10 Last updated: 2019-12-06Bibliographically approved
Asan, N. B., Hassan, E., Perez, M. D., Shah, S. R., Velander, J., Blokhuis, T. J., . . . Augustine, R. (2019). Assessment of Blood Vessel Effect on Fat-Intrabody Communication Using Numerical and Ex-Vivo Models at 2.45 GHZ. IEEE Access, 7, 89886-89900
Open this publication in new window or tab >>Assessment of Blood Vessel Effect on Fat-Intrabody Communication Using Numerical and Ex-Vivo Models at 2.45 GHZ
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2019 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 89886-89900Article in journal (Refereed) Published
Abstract [en]

The potential offered by the intra-body communication (IBC) over the past few years has resulted in a spike of interest for the topic, specifically for medical applications. Fat-IBC is subsequently a novel alternative technique that utilizes fat tissue as a communication channel. This work aimed to identify such transmission medium and its performance in varying blood-vessel systems at 2.45 GHz, particularly in the context of the IBC and medical applications. It incorporated three-dimensional (3D) electromagnetic simulations and laboratory investigations that implemented models of blood vessels of varying orientations, sizes, and positions. Such investigations were undertaken by using ex-vivo porcine tissues and three blood-vessel system configurations. These configurations represent extreme cases of real-life scenarios that sufficiently elucidated their principal influence on the transmission. The blood-vessel models consisted of ex-vivo muscle tissues and copper rods. The results showed that the blood vessels crossing the channel vertically contributed to 5.1 dB and 17.1 dB signal losses for muscle and copper rods, respectively, which is the worst-case scenario in the context of fat-channel with perturbance. In contrast, blood vessels aligned-longitudinally in the channel have less effect and yielded 4.5 dB and 4.2 dB signal losses for muscle and copper rods, respectively. Meanwhile, the blood vessels crossing the channel horizontally displayed 3.4 dB and 1.9 dB signal losses for muscle and copper rods, respectively, which were the smallest losses among the configurations. The laboratory investigations were in agreement with the simulations. Thus, this work substantiated the fat-IBC signal transmission variability in the context of varying blood vessel configurations.

Keywords
Blood vessel, channel characterization, fat-IBC, intrabody microwave communication, path loss
National Category
Medical Laboratory and Measurements Technologies
Identifiers
urn:nbn:se:uu:diva-392068 (URN)10.1109/ACCESS.2019.2926646 (DOI)000476817400018 ()
Funder
Vinnova, 2015-04159Vinnova, 2017-03568Swedish Foundation for Strategic Research , RIT17-0020EU, Horizon 2020, SINTEC-824984eSSENCE - An eScience Collaboration
Available from: 2019-09-09 Created: 2019-09-09 Last updated: 2019-11-29Bibliographically approved
Ebrahimizadeh, J., Perez, M. D. & Augustine, R. (2019). Electromagnetic Time-Reversal Technique for Monitoring Skull Healing Stages. In: 2019 13th European Conference On Antennas And Propagation (EuCAP): . Paper presented at 13th European Conference on Antennas and Propagation (EuCAP), MAR 31-APR 05, 2019, Krakow, POLAND. IEEE
Open this publication in new window or tab >>Electromagnetic Time-Reversal Technique for Monitoring Skull Healing Stages
2019 (English)In: 2019 13th European Conference On Antennas And Propagation (EuCAP), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

This paper provides a novel non-resonant spectroscopy technique for monitoring of the healing process in skull defects created in cranial surgery. Currently, there is not such a method and information on the healing process which is vital to avoid further complications and for a better understanding of the process. During the healing, which can take several months, the thickness and the permittivity of the skull varies. The proposed approach makes use of the approximated Dyadic Green's function integral equation for deriving the variations in permittivity of the skull. The scattered electric field from the defect is collected using Time-Reversal Array (TRA) in order to produce the Multi-StaticData Matrix (MDM). The singular value decomposition on the MDM matrix based on time reversal operator (TRO) decomposition (known under French acronym DORT), provides information of the permittivity of the defect. The problem of the sensing the defect response after the cranial surgery is formulated for multi-layer medium and it will be shown that the dominant singular values are corresponding to the permittivity of the defect. Finally, the veracity of the theory is clarified by conducting a numerical simulation for a planar multi-layer medium consisting of skin, skull brain and a defect embedded in the skull. We show that the dominant singular values corresponding to the defect permittivity vary significantly which conclude that the dominant singular value can be a good criterion for monitoring the skull healing stages.

Place, publisher, year, edition, pages
IEEE, 2019
Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
Keywords
Time-Reversal, Singular Value Decomposition, Dyadic Green's Function, Bone Mineral Density, Spectroscopy
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-393691 (URN)000480384703096 ()978-8-8907-0188-7 (ISBN)
Conference
13th European Conference on Antennas and Propagation (EuCAP), MAR 31-APR 05, 2019, Krakow, POLAND
Funder
Swedish Research Council, 2017-04644EU, Horizon 2020, 824984Swedish Foundation for Strategic Research , RIT170020Vinnova, 2015-04159
Available from: 2019-09-25 Created: 2019-09-25 Last updated: 2020-01-08Bibliographically approved
Peng, Z., Tang, H., Augustine, R., Le, J., Tian, W., Chen, Y., . . . Jiang, T. (2019). From ferronickel slag to value-added refractory materials: A microwave sintering strategy. Resources, Conservation and Recycling, 149, 521-531
Open this publication in new window or tab >>From ferronickel slag to value-added refractory materials: A microwave sintering strategy
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2019 (English)In: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 149, p. 521-531Article in journal (Refereed) Published
Abstract [en]

The present study proposes a novel strategy for preparation of refractory materials from potentially hazardous ferronickel slag by microwave sintering of the slag with addition of sintered magnesia in which a series of chemical reactions were involved. This strategy was developed based on examination of the phase transformations and microstructural changes of the slag during microwave sintering through X-ray diffraction (XRD) analysis and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) analysis, which determined the properties of refractory materials derived from the slag. It was shown that under microwave irradiation there existed rapid transformation of the olivine phase in the slag to high-melting point phases, including forsterite and spinels (e.g., magnesium iron chromate spinel, magnesium chromate spinel, and magnesium iron aluminate spinel). As a result, a high-quality refractory material with refractoriness of 1730 degrees C, bulk density of 2.80 g/cm(3), apparent porosity of 1.6%, and compressive strength of 206.62 MPa was obtained by microwave sintering of the slag at 1350 degrees C for only 20 min with addition of 25 wt % sintered magnesia. Because the microwave sintering strategy not only elevated the refractoriness by 70 degrees C, but also reduced the heating duration required by the conventional approach by 6 times, it demonstrated apparent technological superiority and wide application prospect in preparing superior-quality refractory materials from ferronickel slag and relevant industrial waste, which contributed to conservation of resources and energy as well as environmental protection.

Place, publisher, year, edition, pages
ELSEVIER, 2019
Keywords
Ferronickel slag, Refractory material, Microwave sintering, Phase transformation, Spinel
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:uu:diva-394190 (URN)10.1016/j.resconrec.2019.06.019 (DOI)000483414300048 ()
Available from: 2019-10-08 Created: 2019-10-08 Last updated: 2019-10-08Bibliographically approved
Lee, D., Shaker, G. & Augustine, R. (2019). Imaging of Defect Responses on Cranial Vault Phantom Model utilizing Curved Array Measurement. In: 2019 13th European Conference On Antennas And Propagation (EUCAP): . Paper presented at 13th European Conference on Antennas and Propagation (EuCAP), MAR 31-APR 05, 2019, Krakow, POLAND. IEEE
Open this publication in new window or tab >>Imaging of Defect Responses on Cranial Vault Phantom Model utilizing Curved Array Measurement
2019 (English)In: 2019 13th European Conference On Antennas And Propagation (EUCAP), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents the reconstructed curved images after craniotomy. The performance of the resistively tapered antenna is evaluated in terms of short-range sensing aspects. A series of amplitude scans along the curved array structure is proposed and measured. Three different conditions at the defect area are emulated and these images are reconstructed as a curved cranial shape.

Place, publisher, year, edition, pages
IEEE, 2019
Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
Keywords
craniotomy, curved array, microwave imaging, resistively tapered antenna, reconstructed image
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Communication Systems
Identifiers
urn:nbn:se:uu:diva-393692 (URN)000480384702178 ()978-8-8907-0188-7 (ISBN)
Conference
13th European Conference on Antennas and Propagation (EuCAP), MAR 31-APR 05, 2019, Krakow, POLAND
Available from: 2019-09-25 Created: 2019-09-25 Last updated: 2019-09-25Bibliographically approved
Redzwan Mohd Shah, S., Velander, J., Perez, M. D., Joseph, L., Mattsson, V., Asan, N. B., . . . Augustine, R. (2019). Improved Sensor for Non-invasive Assessment of Burn Injury Depth Using Microwave Reflectometry. In: 2019 13th European Conference on Antennas and Propagation (EuCAP): . Paper presented at 2019 13th European Conference on Antennas and Propagation (EuCAP), 31 March-5 April 2019, Krakow, Poland.
Open this publication in new window or tab >>Improved Sensor for Non-invasive Assessment of Burn Injury Depth Using Microwave Reflectometry
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2019 (English)In: 2019 13th European Conference on Antennas and Propagation (EuCAP), 2019Conference paper, Published paper (Refereed)
Abstract [en]

The European project “Senseburn” aims to develop a non-invasive diagnostic instrument for assessing the depth and propagation of human burns in the clinical scenario. This article introduces an improved flexible microwave split-ring resonator-based sensor, as a new development in this project. The excitation system and the fabrication process are the major improvements with respect to its precedent microwave sensor, both based in polydimethylsiloxane (PDMS) and copper. Both improvements are introduced together with the design of the sensor and of the experimental setup. Human tissue emulating phantoms are designed, fabricated, validated, and employed to emulate different burn depths and to validate the conceptual functionality of the proposed sensor. The Keysight dielectric probe 85070E is employed for the phantom validation. The analysis suggests that the sensor could estimate the burn depth. Future works will be carried out with ex vivo human tissues. 

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Microwave Technology
Identifiers
urn:nbn:se:uu:diva-390800 (URN)000480384702154 ()978-88-907018-8-7 (ISBN)
Conference
2019 13th European Conference on Antennas and Propagation (EuCAP), 31 March-5 April 2019, Krakow, Poland
Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2020-01-08Bibliographically approved
Voigt, T., Augustine, R., Asan, N. B., Perez, M. D., Ahlén, A., Teixeira, A., . . . Mani, M. (2019). LifeSec - Don’t Hack my Body. In: : . Paper presented at IEEE EuroS&P 2019 and CySeP'19.
Open this publication in new window or tab >>LifeSec - Don’t Hack my Body
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2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Computer Engineering Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-397853 (URN)
Conference
IEEE EuroS&P 2019 and CySeP'19
Available from: 2019-12-03 Created: 2019-12-03 Last updated: 2020-01-08
Mathur, P., Perez, M. D., Augustine, R. & Kurup, D. G. (2019). NDECOAX: A software package for nondestructive evaluation of stratified dielectric media. SoftwareX, 9, 187-192
Open this publication in new window or tab >>NDECOAX: A software package for nondestructive evaluation of stratified dielectric media
2019 (English)In: SoftwareX, E-ISSN 2352-7110, Vol. 9, p. 187-192Article in journal (Refereed) Published
Abstract [en]

This article presents a software package based on the C++ language for accurate computation of material properties of a stratified media using an open ended coaxial probe (OECP). Since OECP is one of the most commonly used sensors for evaluation of materials today, the program developed can be customized for real time nondestructive evaluation of materials. The main contribution of this article is a computationally efficient software for solving an infinite domain integral with multiple singularities based on plane wave spectrum theory. The computed results for aperture admittance of the coaxial probe using the developed software show good agreement with both measurements and results from a commercial solver using the finite element method (FEM). It is also proved that, the execution time per frequency point of the developed code is much faster than FEM. (C) 2019 The Authors. Published by Elsevier B.V.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Coaxial probe, Nondestructive evaluation (NDE)
National Category
Software Engineering Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-384001 (URN)10.1016/j.softx.2019.02.001 (DOI)000466818600029 ()
Funder
Vinnova, 2015-04159
Available from: 2019-05-28 Created: 2019-05-28 Last updated: 2020-01-08Bibliographically approved
Meaney, P. M., Geimer, S. D., Augustine, R. & Paulsen, K. D. (2019). Quasi- Open-Ended Coaxial Dielectric Probe Array for Skin Burn Characterization. In: 2019 13th European Conference On Antennas And Propagation (EUCAP): . Paper presented at 13th European Conference on Antennas and Propagation (EuCAP), MAR 31-APR 05, 2019, Krakow, POLAND. IEEE
Open this publication in new window or tab >>Quasi- Open-Ended Coaxial Dielectric Probe Array for Skin Burn Characterization
2019 (English)In: 2019 13th European Conference On Antennas And Propagation (EUCAP), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

We have developed a planar probe for measuring dielectric properties. It exploits modern circuit board fabrication technologies that effectively construct a quasi-coaxial structure running perpendicular to the board. The feed line is a printed coplanar waveguide which comes in from the side on the top plane. The opening to the bottom behaves exactly like an open-ended coaxial probe. The initial results are comparable to the existing coaxial probes. The geometry of these probes allows them to be fabricated in an array utilizing standard, multi-layer circuit fabrication technology. These probe arrays may prove extremely useful in applications such as tumor margin detection for resected tissue, skin cancer screening and characterizing burns.

Place, publisher, year, edition, pages
IEEE, 2019
Series
Proceedings of the European Conference on Antennas and Propagation, ISSN 2164-3342
Keywords
planar probe, dielectric, quasi-coaxial, measurement
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-393693 (URN)000480384702003 ()978-8-8907-0188-7 (ISBN)
Conference
13th European Conference on Antennas and Propagation (EuCAP), MAR 31-APR 05, 2019, Krakow, POLAND
Available from: 2019-09-25 Created: 2019-09-25 Last updated: 2019-09-25Bibliographically approved
Voigt, T., Augustine, R., Asan, N. B., Perez, M. D., Ahlén, A., Teixeira, A., . . . Mani, M. (2019). Tumor Sensing Privacy in In-Body Networks. In: : . Paper presented at EEE EuroS&P 2019 and CySeP'19.
Open this publication in new window or tab >>Tumor Sensing Privacy in In-Body Networks
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2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Computer Engineering Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-398222 (URN)
Conference
EEE EuroS&P 2019 and CySeP'19
Available from: 2019-12-03 Created: 2019-12-03 Last updated: 2020-01-08
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-2876-223X

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