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Graphene based functional devices: A short review

Frontiers of physics 2019年第1期14卷 23-42页

作者： Rong Wang Xin-Gang Ren Ze Yan Li-Jun Jiang Wei E. I. Sha Guang-Cun Shan Department of Electrical and Electronic Engineering The University of Hong Kong Pokfulam Road Hong Kong China Key Laboratory of Intelligent Computing & Signal Processing Ministry of Education Anhui University Hefei 230039 China School of Instrumentation Science & Opto-electronics Engineering Beihang University Beijing 100191 China Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science & Electronic Engineering Zhejiang University Hangzhou 310027 China California NanoSystem Institute and Department of Chemistry & Biochemistry University of California Los Angeles CA 90095 USA

Graphene is an ideal 2D material system bridging electronic and photonic devices. It also breaks the fundamental speed and size limits by electronics and photonics, respectively. Graphene offers multiple functions of signal transmission, emission, modulation, and detection in a broad band, high speed, compact size, and low loss. Here, we have a brief view of graphene based functional devices at microwave, terahertz, and optical frequencies. Their fundamental physics and computational models were discussed as well.

关键词： graphene terahertz antenna microwave

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Automated Exudates Detection in Retinal Fundus image Using Morphological Operator and Entropy Maximization Thresholding

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Journal of Biomedical Science and engineering 2019年第3期12卷 212-224页

作者： G. H. Kom B. C. Wouantsa Tindo J. R. Mboupda Pone A. B. Tiedeu Research Unit of Automation and Applied Informatics (URAIA) Department of Electrical Engineering IUT-FV Bandjoun University of Dschang Bandjoun Cameroon Research Group on Medical Technologies Applied to the Tropics (GRETMAT) Laboratory of Electronics and Signal Processing (LETS) ENSP University of Yaoundé I Yaoundé Cameroon Research Unit for Condensed Matter Electronics and Signal Processing (LAMACETS) Department of Physics University of Dschang Dschang Cameroon Signal Image and Systems Laboratory Ebolowa Cameroon

Blindness which is considered as degrading disabling disease is the final stage that occurs when a certain threshold of visual acuity is overlapped. It happens with vision deficiencies that are pathologic states due to many ocular diseases. Among them, diabetic retinopathy is nowadays a chronic disease that attacks most of diabetic patients. Early detection through automatic screening programs reduces considerably expansion of the disease. Exudates are one of the earliest signs. This paper presents an automated method for exudates detection in digital retinal fundus image. The first step consists of image enhancement. It focuses on histogram expansion and median filter. The difference between filtered image and his inverse reduces noise and removes background while preserving features and patterns related to the exudates. The second step refers to blood vessel removal by using morphological operators. In the last step, we compute the result image with an algorithm based on Entropy Maximization Thresholding to obtain two segmented regions (optical disk and exudates) which were highlighted in the second step. Finally, according to size criteria, we eliminate the other regions obtain the regions of interest related to exudates. Evaluations were done with retinal fundus image DIARETDB1 database. DIARETDB1 gathers high-quality medical images which have been verified by experts. It consists of around 89 colour fundus images of which 84 contain at least mild non-proliferative signs of the diabetic retinopathy. This tool provides a unified framework for benchmarking the methods, but also points out clear deficiencies in the current practice in the method development. Comparing to other recent methods available in literature, we found that the proposed algorithm accomplished better result in terms of sensibility (94.27%) and specificity (97.63%).

关键词： Diabetic Retinopathy Retinal Fundus image Exudates Entropy Maximization Thresholding

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Dynamical analysis of a novel single Opamp-based autonomous LC oscillator: antimonotonicity, chaos, and multiple attractors

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International Journal of Dynamics and Control 2018年第4期6卷 1543-1557页

作者： Kengne, J. Tsafack, N. Kengne, L. Kamdjeu Department of Electrical Engineering IUT-FV Bandjoun University of Dschang Dschang Cameroon Laboratory of Electronics and Signal Processing Department of Physics University of Dschang P.O. Box 67 Dschang Cameroon

A novel autonomous RLCC-Diodes-Opamp chaotic oscillator with a pair of antiparallel semiconductor diodes implementing hyperbolic sine nonlinearity is introduced. Basic dynamic properties of the new system are categorized numerically with respect to its parameters by exploiting standard nonlinear analysis tools such as time series, bifurcation diagrams, plots of largest Lyapunov exponent, phase portraits, Poincaré sections, and basins of attraction. Some striking phenomena are reported including antimonotonicity, period doubling, crises, chaos, hysteresis, and coexisting bifurcations. More importantly, one of the most interesting results is the finding of various regions in the parameters’ space in which the proposed oscillator develops the phenomenon of multiple attractors characterized by the coexistence of up to four disconnected periodic and chaotic attractors for the same values of parameters. laboratory measurements are consistent with the theoretical results. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.

关键词： Nonlinear analysis

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Harmony-Search and Otsu based System for Coronavirus Disease (COVID-19) Detection using Lung CT Scan images

arXiv

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arXiv 2020年

作者： Rajinikanth, V. Dey, Nilanjan Raj, Alex Noel Joseph Hassanien, Aboul Ella Santosh, K.C. Raja, N. Sri Madhava Department of Electronics and Instrumentation Engineering St. Joseph’s College of Engineering Chennai600119 India Department of Information Technology Techno India College of Technology KolkataWest Bengal700156 India Key Laboratory of Digital Signal and Image Processing of Guangdong Province Department of Electronic Engineering College of Engineering Shantou University Shantou Guangdong China Faculty of Computers and Artificial Intelligence Cairo University Egypt Department of Computer Science University of South Dakota 414 E Clark St VermillionSD57069 United States

Pneumonia is one of the foremost lung diseases and untreated pneumonia will lead to serious threats for all age groups. The proposed work aims to extract and evaluate the Coronavirus disease (COVID-19) caused pneumonia infection in lung using CT scans. We propose an image-assisted system to extract COVID-19 infected sections from lung CT scans (coronal view). It includes following steps: (i) Threshold filter to extract the lung region by eliminating possible artifacts;(ii) image enhancement using Harmony-Search-Optimization and Otsu thresholding;(iii) image segmentation to extract infected region(s);and (iv) Region-of-interest (ROI) extraction (features) from binary image to compute level of severity. The features that are extracted from ROI are then employed to identify the pixel ratio between the lung and infection sections to identify infection level of severity. The primary objective of the tool is to assist the pulmonologist not only to detect but also to help plan treatment process. As a consequence, for mass screening processing, it will help prevent diagnostic burden. Copyright © 2020, The Authors. All rights reserved.

关键词： Coronavirus

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AIM 2020 Challenge on image Extreme Inpainting 16th

AIM 2020 Challenge on Image Extreme Inpainting

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Workshops held at the 16th European Conference on Computer Vision, ECCV 2020

作者： Ntavelis, Evangelos Romero, Andrés Bigdeli, Siavash Timofte, Radu Hui, Zheng Wang, Xiumei Gao, Xinbo Shin, Chajin Kim, Taeoh Son, Hanbin Lee, Sangyoun Li, Chao Li, Fu He, Dongliang Wen, Shilei Ding, Errui Bai, Mengmeng Li, Shuchen Zeng, Yu Lin, Zhe Yang, Jimei Zhang, Jianming Shechtman, Eli Lu, Huchuan Zeng, Weijian Ni, Haopeng Cai, Yiyang Li, Chenghua Xu, Dejia Wu, Haoning Han, Yu Nadim, Uddin S. M. Jang, Hae Woong Ahmed, Soikat Hasan Yoon, Jungmin Jung, Yong Ju Li, Chu-Tak Liu, Zhi-Song Wang, Li-Wen Siu, Wan-Chi Lun, Daniel P. K. Suin, Maitreya Purohit, Kuldeep Rajagopalan, A.N. Narang, Pratik Mandal, Murari Chauhan, Pranjal Singh Computer Vision Lab ETH Zürich Zürich Switzerland CSEM Neuchâtel Switzerland School of Electronic Engineering Xidian University Xi’an China Image and Video Pattern Recognition Laboratory School of Electrical and Electronic Engineering Yonsei University Seoul Korea Republic of Baidu Inc. Beijing China Beijing China Dalian University of Technology Dalian China Adobe San Jose United States Rensselaer Polytechnic Institute Troy United States Peking University Beijing China Lab Gachon University Seongnam Korea Republic of Centre for Multimedia Signal Processing Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong China Indian Institute of Technology Madras Chennai India BITS Pilani Pilani India MNIT Jaipur Jaipur India

ISBN: (纸本)9783030670696

This paper reviews the AIM 2020 challenge on extreme image inpainting. This report focuses on proposed solutions and results for two different tracks on extreme image inpainting: classical image inpainting and semantically guided image inpainting. The goal of track 1 is to inpaint large part of the image with no supervision. Similarly, the goal of track 2 is to inpaint the image by having access to the entire semantic segmentation map of the input. The challenge had 88 and 74 participants, respectively. 11 and 6 teams competed in the final phase of the challenge, respectively. This report gauges current solutions and set a benchmark for future extreme image inpainting methods. © 2020, Springer Nature Switzerland AG.

关键词： Semantic Segmentation

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Benchmarking quality-dependent and cost-sensitive score-level multimodal biometric fusion algorithms

arXiv

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arXiv 2021年

作者： Poh, Norman Bourlai, Thirimachos Kittler, Josef Allano, Lorene Alonso-Fernandez, Fernando Ambekar, Onkar Baker, John Dorizzi, Bernadette Fatukasi, Omolara Fierrez, Julian Ganster, Harald Ortega-Garcia, Javier Maurer, Donald Salah, Albert Ali Scheidat, Tobias Vielhauer, Claus Centre for Vision Speech and Signal Processing School of Electronics and Physical Sciences University of Surrey Guildford SurreyGU2 7XH United Kingdom Biometrics Center Lane Department of Computer Science and Electrical Engineering College of Engineering and Mineral Resources West Virginia University MorgantownWV26506-6109 United States Institut Telecom Telecom and Management SudParis Evry91011 France Biometric Recognition Group – ATVS Escuela Politecnica Superior Universidad Autonoma de Madrid Madrid28049 Spain Amsterdam1098 XG Netherlands Applied Physics Laboratory Johns Hopkins University LaurelMD20723 United States Electronics and Physics Department Institut Telecom Telecom and Management SudParis Evry91011 France Institute of Digital Image Processing Joanneum Research Graz8010 Austria ISLA-ISIS University of Amsterdam Amsterdam1098 XG Netherlands Department of Informatics and Media Brandenburg University of Applied Sciences Brandenburg an der HavelD-14770 Germany Research Group Multimedia and Security Department of Technical and Business Information Systems Faculty of Computer Science Otto-von-Guericke-University of Magdeburg MagdeburgD-39106 Germany

Automatically verifying the identity of a person by means of biometrics (e.g., face and fingerprint) is an important application in our day-to-day activities such as accessing banking services and security control in airports. To increase the system reliability, several biometric devices are often used. Such a combined system is known as a multimodal biometric system. This paper reports a benchmarking study carried out within the framework of the BioSecure DS2 (Access Control) evaluation campaign organized by the University of Surrey, involving face, fingerprint, and iris biometrics for person authentication, targeting the application of physical access control in a medium-size establishment with some 500 persons. While multimodal biometrics is a well-investigated subject in the literature, there exists no benchmark for a fusion algorithm comparison. Working towards this goal, we designed two sets of experiments: quality-dependent and cost-sensitive evaluation. The quality-dependent evaluation aims at assessing how well fusion algorithms can perform under changing quality of raw biometric images principally due to change of devices. The cost-sensitive evaluation, on the other hand, investigates how well a fusion algorithm can perform given restricted computation and in the presence of software and hardware failures, resulting in errors such as failure-to-acquire and failure-to-match. Since multiple capturing devices are available, a fusion algorithm should be able to handle this nonideal but nevertheless realistic scenario. In both evaluations, each fusion algorithm is provided with scores from each biometric comparison subsystem as well as the quality measures of both the template and the query data. The response to the call of the evaluation campaign proved very encouraging, with the submission of 22 fusion systems. To the best of our knowledge, this campaign is the first attempt to benchmark quality-based multimodal fusion algorithms. In the presence of changing

关键词： Benchmarking

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Nonlinear behavior of a novel chaotic jerk system: antimonotonicity, crises, and multiple coexisting attractors

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International Journal of Dynamics and Control 2018年第2期6卷 468-485页

作者： Kengne, Jacques Signing, V. R. Folifack Chedjou, J.C. Leutcho, G.D. Department of Electrical Engineering IUT-FV Bandjoun University of Dschang Dschang Cameroon Laboratory of Electronics and Signal Processing Department of Physics University of Dschang P.O. Box 67 Dschang Cameroon Institute of Smart Systems Technologies University of Klagenfurt Klagenfurt Austria

In this contribution, a novel Jerk system with a smooth piecewise quadratic nonlinearity is introduced. The new nonlinearity provides a similar smoothness as the cubic polynomial function, but a faster response and a simpler circuitry. The basic dynamical properties of the model are discussed in terms of its parameters by using standard nonlinear analysis tools including phase space trajectory plots, frequency spectra, bifurcation diagrams and Lyapunov exponent plots. The bifurcation analysis yields very rich and interesting scenarios such as period-doubling bifurcations, antimonotonicity (i.e. the concurrent creation and annihilation of periodic orbits), periodic windows, and symmetry recovering crises. One of the main findings of this work is the presence of a window in the parameter space in which the novel jerk system experiences the unusual and striking feature of multiple coexisting attractors (i.e. coexistence of four or six disconnected periodic and chaotic attractors) for the same parameters’ setting. Correspondingly, basins of attraction of various competing attractors display extremely complex basin boundaries. Compared to some lower dimensional systems (e.g. Leipnik–Newton system, modified Sprott B system) capable of displaying such type of behavior reported to date, the jerk system introduced in this work represents the simplest and the most ‘elegant’ paradigm. An electronic circuit for allowing an illustration of the theoretical model is proposed and implemented in PSpice. The results obtained in this work let us conjecture that there exist some regions in its parameter space (that need to be uncovered) in which the universal Chua’s circuit experiences six disconnected non static attractors similar to those presented in this work. © 2017, Springer-Verlag Berlin Heidelberg.

关键词： Nonlinear analysis

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Transferring the Full-Duplex Radio Technology from Wireless Networking to Defense and Security 52

Transferring the Full-Duplex Radio Technology from Wireless ...

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52nd Asilomar Conference on signals, Systems and Computers, ACSSC 2018

作者： Parlin, Karel Riihonen, Taneli Wichman, Risto Korpi, Dani Rantelon Tallinn Estonia Laboratory of Electronics and Communications Engineering Tampere University of Technology Tampere Finland Department of Signal Processing and Acoustics Aalto University School of Electrical Engineering Helsinki Finland

ISBN: (纸本)9781538692189

Classically, the in-band full-duplex (IBFD) radio technology that has recently been revolutionizing modern wireless communications was used in the form of same-frequency simultaneous transmit and receive (SF-STAR) operation in continuous-wave radars. Thus far, the main motivation for IBFD operation in commercial wireless communication systems has been to improve their spectral efficiency. In this invited paper, we suggest that IBFD/SF-STAR radios could bring about a paradigm shift in defense applications in the form of a multifunction military full-duplex radio (MFDR) by integrating tactical communications, signals intelligence, and electronic warfare as well as investigate the prospects of transferring the concept to civilian/commercial security and privacy applications in the form of a radio shield. © 2018 IEEE.

关键词： Electronic warfare

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Advanced IoT-based monitoring system for real-time photovoltaic performance evaluation: Conception, development and experimental validation

Scientific African

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Scientific African 2025年 28卷

作者： Njimboh Henry Alombah Jerome Ndam Mungwe Ambe Harrison Wulfran Fendzi Mbasso Hilaire Bertrand Fotsin Department of Electrical and Electronics Engineering College of Technology University of Bamenda P.O. Box 39 Bambili Cameroon Department of Renewable Energy Higher Technical Teacher Training College HTTTC The University of Bamenda Bambili Cameroon Material Science Innovation and Modelling (MaSIM) Research Focus Area North-West University Mahikeng Campus Private Bag X2046 Mmabatho 2745 South Africa Department of Electrical and Electronics Engineering College of Technology (COT) University of Buea P.O. Box Buea 63 Cameroon Department of Biosciences Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai 602 105 India Applied Science Research Center Applied Science Private University Amman Jordan Technology and Applied Sciences Laboratory U.I.T. of Douala P.O. Box 8689 Douala University of Douala Cameroon Centre for Research Impact & Outcome Chitkara University Institute of Engineering and Technology Chitkara University Rajpura 140401 Punjab India Unit of Condensed Matter Research Electronics and Signal Processing LAMACET Faculty of Science Department of Physics University of Dschang P.O. Box 67 Dschang Cameroon

This study examines a developed "Advanced IoT-Based Monitoring System for real time photovoltaic performance evaluation” which is an intelligent Internet of Things (IoT)-based device used for monitoring solar photovoltaic (PV) systems. The novel instrument with a data resolution of less than 1 min is designed to measure six important operating variables of PV systems: irradiance, panel temperature, ambient temperature, humidity, PV current, and voltage. The device has the capability to execute statistical operations on the sample data, enabling real-time monitoring of the PV plant's condition. The device exhibits a high level of adaptability in order to monitor PV plants with a maximum rating of up to 90 kW. The device is equipped with weather-resistant sensors, enabling efficient operation in various weather conditions throughout the year. Moreover, the Internet of Things (IoT) functionality allows for the remote monitoring and data collection of a PV system from any location on the globe. The device has undergone testing on a prototype PV system with a power rating of 30 W. The testing took place in Dschang, a location situated in the Western Region of Cameroon. Data was collected over two climatic seasons and the device's various capabilities were presented. One of its notable features is its intuitive user interface, which allows for real-time graphical representation of monitored parameters through a desktop application. This newly developed device is anticipated to function as a comprehensive solution for collecting data from photovoltaic system installations in developing nations, specifically targeting Cameroon. In Cameroon, information regarding PV systems is currently excessively costly and unreliable. The comprehensive findings from a week-long uninterrupted assessment of the PV monitoring device and its applications in harsh environmental conditions demonstrate its reliability and cost-efficiency as a solution for PV system monitoring..

关键词： Smart PV monitoring system IoT-based PV system monitoring Real-time PV data collection PV system parameters Cost-efficient PV monitoring Remote PV monitoring

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A New 4-D Hyperchaotic System with Four-Scroll Hidden Attractor, Its Properties and Bifurcation Analysis 7

A New 4-D Hyperchaotic System with Four-Scroll Hidden Attrac...

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7th International Conference on Global Optimization and Its Application 2018, ICoGOIA 2018

作者： Dolvis, L.G. Vaidyanathan, S. Jacques, K. Sambas, A. Sukono Mamat, M. Laboratory of Condensed Matter Electronics and Signal Processing Faculty of Science Department of Physics University of Dschang Dschang Cameroon Research and Development Centre Vel Tech University Chennai Tamil Nadu India Department of Electrical Engineering IUT FV Bandjoun University of Dschang Dschang Cameroon Department of Mechanical Engineering Universitas Muhammadiyah Tasikmalaya Indonesia Department of Mathematics Faculty of Mathematics and Natural Sciences Universitas Padjadjaran Indonesia Faculty of Informatics and Computing Universiti Sultan Zainal Abidin Kuala Terengganu Malaysia

This paper announces a new four-dimensional hyperchaotic system with a four-scroll attractor and discusses its dynamic properties such as Lyapunov exponents, phase portraits, Kaplan-Yorke dimension and equilibrium points. Our calculations show that the new hyperchaotic system has no equilibrium point and hence it exhibits hidden attractor. Our new hyperchaotic system has three nonlinearities in total. A detailed bifurcation analysis has been presented for the new hyperchaotic system with four-scroll hidden attractor. Specifically, we discussed bifurcation analysis such as route to four-scroll hyperchaos, coexisting bifurcation, multistability, two parameter Lyapunov exponents and antimonotonicity. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Lyapunov functions

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