A computationally efficient crack detection approach based on deep learning assisted by stockwell transform and linear discriminant analysis

Article


Nguyen, Andy, Nguyen, Canh Long, Gharehbaghi, Vahidreza, Perera, Ruveen, Brown, Jason, Yu, Yang and Kalbkhani, Hashem. 2022. "A computationally efficient crack detection approach based on deep learning assisted by stockwell transform and linear discriminant analysis." Structures. 45, pp. 1962-1970. https://doi.org/10.1016/j.istruc.2022.09.107
Article Title

A computationally efficient crack detection approach based on deep learning assisted by stockwell transform and linear discriminant analysis

ERA Journal ID211389
Article CategoryArticle
AuthorsNguyen, Andy (Author), Nguyen, Canh Long (Author), Gharehbaghi, Vahidreza (Author), Perera, Ruveen (Author), Brown, Jason (Author), Yu, Yang (Author) and Kalbkhani, Hashem (Author)
Journal TitleStructures
Journal Citation45, pp. 1962-1970
Number of Pages9
Year2022
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN2352-0124
Digital Object Identifier (DOI)https://doi.org/10.1016/j.istruc.2022.09.107
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S2352012422008839
Abstract

This paper presents SpeedyNet, a computationally efficient crack detection method. Rather than using a computationally demanding convolutional neural network (CNN), this approach made use of a simple neural network with a shallow architecture augmented by a 2D Stockwell transform for feature transformation and linear discriminant analysis for feature reduction. The approach was employed to classify images with minute cracks under three simulated noisy conditions. Using time–frequency image transformation, feature conditioning and a fast deep learning-based classifier, this method performed better in terms of speed, accuracy and robustness compared to other image classifiers. The performance of SpeedyNet was compared to that of two popular pre-trained CNN models, Xception and GoogleNet, and the results demonstrated that SpeedyNet was superior in both classification accuracy and computational speed. A synthetic efficiency index was then defined for further assessment. Compared to GoogleNet and the Xception models, SpeedyNet enhanced classification efficiency at least sevenfold. Furthermore, SpeedyNet’s reliability was demonstrated by its robustness and stability when faced with network parameter and input image uncertainties including batch size, repeatability, data size and image dimensions.

KeywordsCrack detection, Image noise, Stockwell transform, Linear discriminant analysis, Speedynet, Computational efficiency
ANZSRC Field of Research 2020400510. Structural engineering
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Byline AffiliationsSchool of Engineering
University of New South Wales
Urmia University of Technology, Iran
Institution of OriginUniversity of Southern Queensland
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Nguyen, A., Chan, T. H. T., Thambiratnam, D. P., Kodikara, K. T. L., Le, N. T. and Jamali, S.. 2018. "Output-only modal testing and monitoring of civil engineering structures: instrumentation and test management." Chan, Tommy and Mahini, Saeed (ed.) 8th International Conference on Structural Health Monitoring of Intelligent Infrastructure (SHMII 2017): Structural Health Monitoring in Real-World Application. Brisbane, Australia 05 - 08 Dec 2017 Red Hook, NY, USA.
Vibration-based dual-criteria approach for damage detection in arch bridges
Jayasundara, Nirmani, Thambiratnam, David, Chan, Tommy and Nguyen, Andy. 2019. "Vibration-based dual-criteria approach for damage detection in arch bridges." Structural Health Monitoring: an international journal. 18 (5-6), pp. 2004-2019. https://doi.org/10.1177/1475921718810011
Special issue: real world application of SHM in Australia
Nguyen, Andy, Chan, Tommy H. T. and Zhu, Xinqun. 2019. "Special issue: real world application of SHM in Australia." Structural Health Monitoring: an international journal. 18 (1), pp. 3-4. https://doi.org/10.1177/1475921718823980
Identification of vehicle axle loads from bridge responses using preconditioned least square QR-factorization algorithm
Chen, Zhen, Chan, Tommy H.T., Nguyen, Andy and Yu, Ling. 2019. "Identification of vehicle axle loads from bridge responses using preconditioned least square QR-factorization algorithm." Mechanical Systems and Signal Processing. 128, pp. 479-496. https://doi.org/10.1016/j.ymssp.2019.03.043
A new method for locating and quantifying damage in beams from static deflection changes
Le, N. T., Thambiratnam, D. P., Nguyen, A. and Chan, T. H. T. 2019. "A new method for locating and quantifying damage in beams from static deflection changes." Engineering Structures. 180, pp. 779-792. https://doi.org/10.1016/j.engstruct.2018.11.071
Blocking analysis of persistent resource allocations for M2M applications in wireless systems
Brown, Jason, Afrin, Nusrat and Khan, Jamil. 2016. "Blocking analysis of persistent resource allocations for M2M applications in wireless systems ." Transactions on Emerging Telecommunications Technologies. 27 (11), pp. 1513-1529. https://doi.org/10.1002/ett.3091
Model updating of real structures with ambient vibration data
Kodikara, K. A. T. L., Chan, T. H. T., Nguyen, T. and Thambiratnam, D. P.. 2016. "Model updating of real structures with ambient vibration data." Journal of Civil Structural Health Monitoring. 6 (3), pp. 329-341. https://doi.org/10.1007/s13349-016-0178-3
Development of a cost-effective and flexible vibration DAQ system for long-term continuous structural health monitoring
Nguyen, Theanh, Chan, Tommy H. T., Thambiratnam, David P. and King, Les. 2015. "Development of a cost-effective and flexible vibration DAQ system for long-term continuous structural health monitoring." Mechanical Systems and Signal Processing. 64-65, pp. 313-324. https://doi.org/10.1016/j.ymssp.2015.04.003
Synergic identification of prestress force and moving load on prestressed concrete beam based on virtual distortion method
Xiang, Ziru, Chan, Tommy H. T., Thambiratnam, David P. and Nguyen, Theanh. 2016. "Synergic identification of prestress force and moving load on prestressed concrete beam based on virtual distortion method." Smart Structures and Systems. 17 (6), pp. 917-933. https://doi.org/10.12989/sss.2016.17.6.917
Structural Deterioration Detection Using Enhanced Autoregressive Residuals
Monavari, Benyamin, Chan, Tommy H. T., Nguyen, Andy and Thambiratnam, David P.. 2018. "Structural Deterioration Detection Using Enhanced Autoregressive Residuals." International Journal of Structural Stability and Dynamics. 18 (12), pp. 1-19. https://doi.org/10.1142/S0219455418501602
Model updating incorporating measured response uncertainties and confidence levels of tuning parameters
Kodikara, K.A. Tharindu L., Chan, Tommy H.T., Nguyen, Andy and Thambiratnam, David P.. 2016. "Model updating incorporating measured response uncertainties and confidence levels of tuning parameters." International Journal of Lifecycle Performance Engineering. 2 (1/2), pp. 61-78. https://doi.org/10.1504/IJLCPE.2016.082712
Prestress evaluation in prestressed concrete plate-like structures
Pathirage, Thisara S., Chan, Tommy H. T., Thambiratnam, David P., Nguyen, Andy and Moragaspitiya, H. N. P.. 2018. "Prestress evaluation in prestressed concrete plate-like structures." International Journal of Lifecycle Performance Engineering. 2 (3/4), pp. 127-143. https://doi.org/10.1504/IJLCPE.2018.094855
Damage identification in a complex truss structure using modal characteristics correlation method and sensitivity-weighted search space
Nguyen, Khac-Duy, Chan, Tommy H. T., Thambiratnam, David P. and Nguyen, Andy. 2019. "Damage identification in a complex truss structure using modal characteristics correlation method and sensitivity-weighted search space." Structural Health Monitoring: an international journal. 18 (1), pp. 49-65. https://doi.org/10.1177/1475921718809471
Reliability-based load carrying capacity assessment of bridges using structural health monitoring and nonlinear analysis
Jamali, Shojaeddin, Chan, Tommy H. T., Nguyen, Andy and Thambiratnam, David P.. 2019. "Reliability-based load carrying capacity assessment of bridges using structural health monitoring and nonlinear analysis." Structural Health Monitoring: an international journal. 18 (1), pp. 20-34. https://doi.org/10.1177/1475921718808462
Deterioration assessment of buildings using an improved hybrid model updating approach and long-term health monitoring data
Nguyen, Andy, Kodikara, K. A. Tharindu Lakshitha, Chan, Tommy H. T. and Thambiratnam, David P.. 2019. "Deterioration assessment of buildings using an improved hybrid model updating approach and long-term health monitoring data." Structural Health Monitoring: an international journal. 18 (1), pp. 5-19. https://doi.org/10.1177/1475921718799984
ICT skill frameworks: do they achieve their goals and users’ expectations?
Brown, Jason and Parr, Alan. 2018. "ICT skill frameworks: do they achieve their goals and users’ expectations?" Advanced Journal of Professional Practice. 1 (2), pp. 38-47.
Predictive resource allocation in the LTE uplink for event based M2M applications
Brown, Jason and Khan, Jamil. 2013. "Predictive resource allocation in the LTE uplink for event based M2M applications." Kim, Dong-In and Mueller, Peter (ed.) 2013 IEEE International Conference on Communications (ICC). Budapest, Hungary 09 - 13 Jun 2013 Piscataway, NJ. United States. https://doi.org/10.1109/ICCW.2013.6649208
Key performance aspects of an LTE FDD based Smart Grid communications network
Brown, Jason and Khan, Jamil. 2013. "Key performance aspects of an LTE FDD based Smart Grid communications network." Computer Communications. 36 (5), pp. 551-561. https://doi.org/10.1016/j.comcom.2012.12.007
Delay models for static and adaptive persistent resource allocations in wireless systems
Brown, Jason, Afrin, Nusrat and Khan, Jamil Y.. 2016. "Delay models for static and adaptive persistent resource allocations in wireless systems." IEEE Transactions on Mobile Computing. 15 (9), pp. 2193-2205. https://doi.org/10.1109/TMC.2015.2492546
A predictive resource allocation algorithm in the LTE uplink for event based M2M applications
Brown, Jason and Khan, Jamil. 2015. "A predictive resource allocation algorithm in the LTE uplink for event based M2M applications." IEEE Transactions on Mobile Computing. 14 (12), pp. 2433-2446. https://doi.org/10.1109/TMC.2015.2398447
Vibration characteristics and damage detection in a suspension bridge
Wickramasinghe, Wasanthi R., Thambiratnam, David P., Chan, Tommy H. T. and Nguyen, Theanh. 2016. "Vibration characteristics and damage detection in a suspension bridge." Journal of Sound and Vibration. 375, pp. 254-274. https://doi.org/10.1016/j.jsv.2016.04.025
Capacity Estimation of Beam-Like Structures Using Substructural Method
Jamali, Shojaeddin, Chan, Tommy H. T., Koo, Ki-Young, Nguyen, Andy and Thambiratnam, David P.. 2018. "Capacity Estimation of Beam-Like Structures Using Substructural Method." International Journal of Structural Stability and Dynamics. 18 (12), pp. 1-17. https://doi.org/10.1142/S0219455418501626
Moving force identification based on modified preconditioned conjugate gradient method
Chen, Zhen, Chan, Tommy H. T. and Nguyen, Andy. 2018. "Moving force identification based on modified preconditioned conjugate gradient method." Journal of Sound and Vibration. 423, pp. 100-117. https://doi.org/10.1016/j.jsv.2017.11.034
Method development of damage detection in asymmetric buildings
Wang, Yi, Thambiratnam, David P., Chan, Tommy H.T. and Nguyen, Andy. 2018. "Method development of damage detection in asymmetric buildings." Journal of Sound and Vibration. 413, pp. 41-56. https://doi.org/10.1016/j.jsv.2017.10.015
Prestress and excitation force identification in a prestressed concrete box–girder bridge
Xiang, Ziru, Chan, Tommy H. T., Thambiratnam, David P. and Nguyen, Andy. 2017. "Prestress and excitation force identification in a prestressed concrete box–girder bridge." Computers and Concrete. 20 (5), pp. 617-625. https://doi.org/10.12989/cac.2017.20.5.617
Toward effective structural identification of medium-rise building structures
Nguyen, A., Kodikara, K. A. T. L., Chan, T. H. T. and Thambiratnam, D. P.. 2018. "Toward effective structural identification of medium-rise building structures." Journal of Civil Structural Health Monitoring. 8 (1), pp. 63-75. https://doi.org/10.1007/s13349-017-0259-y
Modelling techniques for structural evaluation for bridge assessment
Jamali, Shojaeddin, Chan, Tommy H. T., Nguyen, Andy and Thambiratnam, David P.. 2018. "Modelling techniques for structural evaluation for bridge assessment." Journal of Civil Structural Health Monitoring. 8 (2), pp. 271-283. https://doi.org/10.1007/s13349-018-0269-4
Damage detection in asymmetric buildings using vibration-based techniques
Wang, Y., Thambiratnam, D. P., Chan, T. H. T. and Nguyen, A.. 2018. "Damage detection in asymmetric buildings using vibration-based techniques." Structural Control and Health Monitoring. 25 (5), pp. 1-19. https://doi.org/10.1002/stc.2148
An Interference Mitigation Approach for a Dense Heterogeneous Wireless Sensor Network
Chen, Dong, Brown, Jason and Khan, Jamil Y.. 2016. "An Interference Mitigation Approach for a Dense Heterogeneous Wireless Sensor Network ." 2015 9th International Conference on Signal Processing and Communication Systems (ICSPCS). Cairns, Australia 14 - 16 Dec 2015 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/ICSPCS.2015.7391773
Energy efficient contention window adaptation algorithm for multi-class traffic
Norsyafizan, Wan, Muhamad, W., Khan, Jamil and Brown, Jason. 2016. "Energy efficient contention window adaptation algorithm for multi-class traffic ." 2015 IEEE International RF and Microwave Conference (RFM). Kuching, Malaysia 14 - 16 Dec 2015 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/RFM.2015.7587716
A Distributed Energy Efficient Packet Transmission Algorithm for the IEEE802.11 WLAN
Norsyafizan, Wan Norsyafizan W., Khan, Jamil Y. and Brown, Jason. 2015. "A Distributed Energy Efficient Packet Transmission Algorithm for the IEEE802.11 WLAN." IEEE 10th International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP). Singapore 07 - 09 Apr 2015 United States. https://doi.org/10.1109/ISSNIP.2015.7106912
Energy Efficient Contention Window Adaptation Algorithm for IEEE 802.11 WLAN
Norsyafizan, Wan Norsyafizan Wan, Khan, Jamil Y. and Brown, Jason. 2015. "Energy Efficient Contention Window Adaptation Algorithm for IEEE 802.11 WLAN." 22nd International Conference on Telecommunications (ICT2015). Sydney, Australia 27 - 29 Apr 2015 United States. https://doi.org/10.1109/ICT.2015.7124657
An Area Packet Scheduler to Mitigate Coexistence Issues in a WPAN/WLAN Based Hetergeneous Network
Chen, Dong, Khan, Jamil Y. and Brown, Jason. 2015. "An Area Packet Scheduler to Mitigate Coexistence Issues in a WPAN/WLAN Based Hetergeneous Network." 22nd International Conference on Telecommunications (ICT2015). Sydney, Australia 27 - 29 Apr 2015 United States. https://doi.org/10.1109/ICT.2015.7124704
Performance evaluation of an adaptive semi-persistent LTE packet scheduler for M2M communications
Afrin, Nusrat, Brown, Jason and Khan, Jamil Y.. 2015. "Performance evaluation of an adaptive semi-persistent LTE packet scheduler for M2M communications ." 2014 8th International Conference on Signal Processing and Communication Systems (ICSPCS 2014). Gold Coast, Australia 15 - 17 Dec 2014 United States. https://doi.org/10.1109/ICSPCS.2014.7021125
Impact of reverberation levels on short-range acoustic communication in an underwater swarm sensor network (USSN) and application to transmitter power control
Burrowes, Gunilla E., Brown, Jason and Khan, Jamil Y.. 2015. "Impact of reverberation levels on short-range acoustic communication in an underwater swarm sensor network (USSN) and application to transmitter power control ." OCEANS 2014 MTS/IEEE - St. John’s. St. John's, NL, Canada 14 - 19 Sep 2014 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/OCEANS.2014.7003039
Design of a buffer and channel adaptive LTE semi-persistent scheduler for M2M communications
Afrin, Nusrat, Brown, Jason, Khan, Jamil Y and IEEE. 2015. "Design of a buffer and channel adaptive LTE semi-persistent scheduler for M2M communications ." 2015 IEEE International Conference on Communications (ICC 2015). London, United Kingdom 08 - 12 Jun 2015 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/ICC.2015.7249250
Predictive allocation of resources in the LTE uplink based on maximum likelihood estimation of event propagation characteristics for M2M applications
Brown, Jason and Khan, Jamil Y. 2015. "Predictive allocation of resources in the LTE uplink based on maximum likelihood estimation of event propagation characteristics for M2M applications ." IEEE Global Communications Conference (GLOBECOM 2014). Austin, United States 08 - 12 Dec 2014 United States. https://doi.org/10.1109/GLOCOM.2014.7037592
A Delay Sensitive LTE Uplink Packet Scheduler for M2M Traffic
Afrin, Nusrat, Brown, Jason and Khan, Jamil Y.. 2014. "A Delay Sensitive LTE Uplink Packet Scheduler for M2M Traffic." IEEE Globecom Workshops (GLOBECOM 2013). Atlanta, United States 09 - 13 Dec 2013 United States. https://doi.org/10.1109/GLOCOMW.2013.6825111
A QoS Guaranteed Energy Optimized Packet Transmission Technique for the IEEE802.11 WLAN
Muhamad, Wan Norsyafizan W., Brown, Jason and Khan, Jamil Y.. 2014. "A QoS Guaranteed Energy Optimized Packet Transmission Technique for the IEEE802.11 WLAN." Australasian Telecommunication Networks and Applications Conference (ATNAC 2013). Christchurch, New Zealand 20 - 22 Nov 2013 United States. https://doi.org/10.1109/ATNAC.2013.6705384
Performance analysis of an enhanced delay sensitive LTE uplink scheduler for M2M traffic
Afrin, Nusrat, Brown, Jason and Khan, Jamil Y.. 2014. "Performance analysis of an enhanced delay sensitive LTE uplink scheduler for M2M traffic ." Australasian Telecommunication Networks and Applications Conference (ATNAC 2013). Christchurch, New Zealand 20 - 22 Nov 2013 United States. https://doi.org/10.1109/ATNAC.2013.6705373
A Packet Age Based LTE Uplink Packet Scheduler for M2M Traffic
Afrin, Nusrat, Brown, Jason and Khan, Jamil Y.. 2014. "A Packet Age Based LTE Uplink Packet Scheduler for M2M Traffic." 2013 7th International Conference on Signal Processing and Communication Systems (ICSPCS 2013). Gold Coast, Australia 16 - 18 Dec 2013 United States. https://doi.org/10.1109/ICSPCS.2013.6723987
A QoS Guaranteed Low Energy Packet Transmission Technique for the IEEE 802.11 WLAN
Muhamad, Wan Norsyafizan W., Khan, Jamil Y and Brown, Jason. 2014. "A QoS Guaranteed Low Energy Packet Transmission Technique for the IEEE 802.11 WLAN ." 2014 9th International Symposium on Communication Systems, Networks & Digital Sign Processing (CSNDSP). Manchester, United Kingdom 23 - 25 Jul 2015 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/CSNDSP.2014.6923902
An adaptive RRM scheme for smart grid M2M applications over a WiMAX network
Khan, Reduan H., Mahata, Kaushik and Brown, Jason. 2014. "An adaptive RRM scheme for smart grid M2M applications over a WiMAX network ." 2014 9th International Symposium on Communication Systems, Networks & Digital Sign Processing (CSNDSP). Manchester, United Kingdom 23 - 25 Jul 2015 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/CSNDSP.2014.6923940
Performance analysis of a distributed 6LoWPAN network for the Smart Grid applications
Chen, Dong, Brown, Jason and Khan, Jamil Y.. 2014. "Performance analysis of a distributed 6LoWPAN network for the Smart Grid applications ." IEEE 9th International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP 2014). Singapore 21 - 24 Apr 2014 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/ISSNIP.2014.6827646
An Adaptive Buffer Based Semi persistent Scheduling Scheme for Machine to Machine Communications over LTE
Afrin, Nusrat, Brown, Jason and Khan, Jamil Y.. 2014. "An Adaptive Buffer Based Semi persistent Scheduling Scheme for Machine to Machine Communications over LTE." 2014 8th International Conference on Next Generation Mobile Apps, Services and Technologies (NGMAST). Oxford, United States 10 - 12 Sep 2014 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/NGMAST.2014.48
Performance analysis of a tunable cost function based WLAN energy efficient packet transmission technique
Muhamad, Wan Norsyafizan W., Khan, Jamil Y. and Brown, Jason. 2014. "Performance analysis of a tunable cost function based WLAN energy efficient packet transmission technique ." 2014 IEEE Asia Pacific Conference on Wireless and Mobile (APWiMob 2014). Bali, Indonesia 28 - 30 Aug 2014 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/APWiMob.2014.6920296
UICC control over devices used to obtain service
Brown, Jason and Ahluwalia, Inderpreet Singh. 2014. UICC control over devices used to obtain service. US8639290B2
Performance Analysis of an LTE TDD Based Smart Grid Communications Network for Uplink Biased Traffic
Brown, Jason and Khan, Jamil Y.. 2013. "Performance Analysis of an LTE TDD Based Smart Grid Communications Network for Uplink Biased Traffic." IEEE Globecom Workshops (GLOBECOM 2012). CA, United States 03 - 07 Dec 2012 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/I:10.1109/GLOCOMW.2012.6477808
Performance Comparison of LTE FDD and TDD Based Smart Grid Communications Networks for Uplink Biased Traffic
Brown, Jason and Khan, Jamil Y.. 2013. "Performance Comparison of LTE FDD and TDD Based Smart Grid Communications Networks for Uplink Biased Traffic ." 2012 IEEE Third International Conference on Smart Grid Communications (SmartGridComm). Tainan, Taiwan 05 2012 - 08 Nov 2015 IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/SmartGridComm.2012.6485996
Pilot protection schemes over a multi-service WiMAX network in the smart grid
Khan, Reduan H., Brown, Jason and Khan, Jamil Y.. 2013. "Pilot protection schemes over a multi-service WiMAX network in the smart grid ." 2013 IEEE International Conference on Communications Workshops (ICC). Budapest, Hungary 09 201 - 13 Jun 2013 United States. https://doi.org/10.1109/ICCW.2013.6649381
Reflection: An Efficient Technique for Implementing an LTE Based Wireless Network Control System for Smart Grid and Other Applications
Brown, Jason and Khan, Jamil Y.. 2013. "Reflection: An Efficient Technique for Implementing an LTE Based Wireless Network Control System for Smart Grid and Other Applications." 2013 IEEE International Conference on Communications (ICC). Budapest, Hungary 09 - 13 Jun 2013 United States. https://doi.org/10.1109/ICC.2013.6655194
Adaptive Space Time - Time Division Multiple Access (AST-TDMA) protocol for an underwater swarm of AUV's
Burrowes, Gunilla E., Brown, Jason and Khan, Jamil Y.. 2013. "Adaptive Space Time - Time Division Multiple Access (AST-TDMA) protocol for an underwater swarm of AUV's ." 2013 MTS/IEEE OCEANS - Bergen. Bergen, Norway 10 2013 - 14 Jun 2014 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/OCEANS-Bergen.2013.6608031
6LoWPAN based Neighborhood Area Network for a smart grid communication infrastructure
Chen, Dong, Brown, Jason and Khan, Jamil Y.. 2013. "6LoWPAN based Neighborhood Area Network for a smart grid communication infrastructure ." 2013 Fifth International Conference on Ubiquitous and Future Networks (ICUFN). Da Nang, Vietnam 02 - 05 Jul 2013 United States. IEEE (Institute of Electrical and Electronics Engineers). https://doi.org/10.1109/ICUFN.2013.6614885
Multiple subscription subscriber identity module (SIM) card
Brown, Jason. 2009. Multiple subscription subscriber identity module (SIM) card. US7613480B2
Extended UK models for high frequency spectral occupancy
Pantjiaros, C.A., Wylie, J.A., Brown, J., Gott, G.F. and Laycock, P.J.. 1998. "Extended UK models for high frequency spectral occupancy ." IEE Proceedings - Communications. 145 (3), pp. 168-174. https://doi.org/10.1049/ip-com:19981711
Recent work on the measurement and analysis of spectral occupancy at HF
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