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Wideband Cognitive Radio Networks Based Compressed Spectrum Sensing: A Survey

Journal of Signal and Information Processing 2018年第2期9卷 122-151页

作者： Mohammed Abo-Zahhad Sabah M. Ahmed Mohammed Farrag Khaled Ali BaAli Electronics and Communication Engineering Department School of Electronics Communications and Computer Engineering Egypt-Japan University for Science and Technology Alexandria Egypt Electrical and Electronics Engineering Department Faculty of Engineering Assiut University Assiut Egypt Mechatronics and Robotics Engineering Department School of Innovative Design Engineering Egypt-Japan University for Science and Technology Alexandria Egyp Electrical Engineering Department King Khalid University (KKU) Abha KSA Electronics and Communication Department Faculty of Engineering and Petroleum Hadhramaut University Mukalla Republic of Yemen

Spectrum sensing is a core function at cognitive radio systems to have spectrum awareness. This could be achieved by collecting samples from the frequency band under observation to make a conclusion whether the band is occupied, or it is a spectrum hole. The task of sensing is becoming more challenging especially at wideband spectrum scenario. The difficulty is due to conventional sampling rate theory which makes it infeasible to sample such very wide range of frequencies and the technical requirements are very costly. Recently, compressive sensing introduced itself as a pioneer solution that relaxed the wideband sampling rate requirements. It showed the ability to sample a signal below the Nyquist sampling rate and reconstructed it using very few measurements. In this paper, we discuss the approaches used for solving compressed spectrum sensing problem for wideband cognitive radio networks and how the problem is formulated and rendered to improve the detection performance.

关键词： Cognitive Radio Spectrum Sensing Compressive Sensing Compressed Measurements Nyquist Sampling Rate

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CCNet: Criss-Cross Attention for Semantic Segmentation

arXiv

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arXiv 2018年

作者： Huang, Zilong Wang, Xinggang Wei, Yunchao Huang, Lichao Shi, Humphrey Liu, Wenyu Huang, Thomas S. School of Electronic Information and Communications Huazhong University of Science and Technology Wuhan430074 China Centre for Artificial Intelligence Faculty of Engineering and Information Technology University of Technology Sydney UltimoNSW2007 Australia Horizon Robotics. University of Oregon University of Illinois at Urbana-Champaign University of Illinois at Urbana-Champaign

Contextual information is vital in visual understanding problems, such as semantic segmentation and object detection. We propose a Criss-Cross Network (CCNet) for obtaining full-image contextual information in a very effective and efficient way. Concretely, for each pixel, a novel criss-cross attention module harvests the contextual information of all the pixels on its criss-cross path. By taking a further recurrent operation, each pixel can finally capture the full-image dependencies. Besides, a category consistent loss is proposed to enforce the criss-cross attention module to produce more discriminative features. Overall, CCNet is with the following merits: 1) GPU memory friendly. Compared with the non-local block, the proposed recurrent criss-cross attention module requires 11× less GPU memory usage. 2) High computational efficiency. The recurrent criss-cross attention significantly reduces FLOPs by about 85% of the non-local block. 3) The state-of-the-art performance. We conduct extensive experiments on semantic segmentation benchmarks including Cityscapes, ADE20K, human parsing benchmark LIP, instance segmentation benchmark COCO, video segmentation benchmark CamVid. In particular, our CCNet achieves the mIoU scores of 81.9%, 45.76% and 55.47% on the Cityscapes test set, the ADE20K validation set and the LIP validation set respectively, which are the new state-of-the-art results. The source codes are available at https://***/speedinghzl/CCNet. Copyright © 2018, The Authors. All rights reserved.

关键词： Semantic Segmentation

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Survey of Drones for Agriculture Automation from Planting to Harvest

Survey of Drones for Agriculture Automation from Planting to...

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IEEE International Conference on Intelligent Engineering Systems

作者： Marck Kulbacki Jakub Segen Wojciech Kniec Ryszard Klempous Konrad Kluwak Jan Nikodem Julita Kulbacka Andrea Serester DIVE IN AI Wroclaw Poland Faculty of Electronics Wroclaw University of Science and Technology Wroclaw Poland Department of Molecular and Cellular Biology Wroclaw Medical University Wroclaw Poland Antal Bejczy Center for Intelligent Robotics Óbuda University Budapest Hungary

Farmers explore the capabilities for applications of Robotic Process Automation (RPA) with image processing, pattern recognition and machine learning, so its logical to ask where best to apply this technology for maximum effect. Machines can do automated tasks better, cheaper and faster. One can use the camera from the sky and measure things on the earth especially on cropland from drones and satellites. Over time, drones have increased in capabilities and fallen in cost, and their use has greatly expanded especially in complex terrain. High quality remote sensing with spectral imaging using drones makes them interesting for regular use in Precision Agriculture (PA). Drones are often used in agriculture in ways that were highly controversial only a short time ago even there are no unified legislation on drones usage in agriculture. In this paper we address problem of Remote Sensing (RS) technologies combined with Unmanned Aerial System (UAS) platforms to support and develop selected agriculture operations like map or sensor-based Variable Rate Application (VRA).

关键词： Agriculture Drones Sensors Satellites Remote sensing Temperature measurement Monitoring

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Correction: Quantifying Collision Frequency and Intensity in Rugby Union and Rugby Sevens: A Systematic Review

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Sports medicine - open 2022年第1期8卷 96页

作者： Lara Paul Mitchell Naughton Ben Jones Demi Davidow Amir Patel Mike Lambert Sharief Hendricks Division of Physiological Sciences Department of Human Biology Faculty of Health Sciences University of Cape Town Cape Town South Africa. sharief.hendricks01@***. Health Through Physical Activity Lifestyle and Sport Research Centre (HPALS) Department of Human Biology Faculty of Health Sciences University of Cape Town Cape Town South Africa. sharief.hendricks01@***. School of Health and Behavioural Sciences University of the Sunshine Coast Sippy Downs QLD Australia. Centre for Human Factors and Sociotechnical Systems University of the Sunshine Coast Sippy Downs QLD Australia. Division of Physiological Sciences Department of Human Biology Faculty of Health Sciences University of Cape Town Cape Town South Africa. School of Science and Technology University of New England Armidale NSW Australia. Carnegie Applied Rugby Research (CARR) Centre Carnegie School of Sport Leeds Beckett University Leeds UK. Leeds Rhinos Rugby League Club Leeds UK. England Performance Unit The Rugby Football League Leeds UK. Health Through Physical Activity Lifestyle and Sport Research Centre (HPALS) Department of Human Biology Faculty of Health Sciences University of Cape Town Cape Town South Africa. Department of Electrical Engineering African Robotics Unit University of Cape Town Western Cape South Africa.

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Heart work analysis by means of recurrence-based methods

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Diagnostyka 2017年第4期18卷 89-96页

作者： Iwaniec, Joanna Iwaniec, Marek AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Robotics and Mechatronics Mickiewicz Alley 30 Krakow30-059 Poland AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Process Control Mickiewicz Alley 30 Krakow30-059 Poland

Currently, for the purposes of recorded ECG signals (electrocardiograms) interpretation, the classical methods involving analysis of geometrical properties of the recorded waveforms in time domain are used. Such an analysis consists in determining the values of parameters describing the heart rate and rhythm. However, these indicators can not be treated as an infallible criterion for diagnosis and, moreover, the limits of increasing the accuracy of ECG analysis by increasing the accuracy of determining its characteristic points have already been reached. Therefore, in the paper, for the purposes of analysis of registered ECG signals and acoustical recordings of heart work, it is proposed to use the recurrence plots and RQA analysis methods that consist in searching for the recurrence properties of the registered signals. Application of the recurrence-based methods is natural due to the cyclic character of the heart work while providing patterns characteristic for different cardiac dysfunctions supported by objective, quantitative measures will contribute to early, credible and reliable classification of cardiovascular dysfunction.

关键词： Electrocardiograms

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Some aspects of gaseous hydrogen storage and the performance of a 10-kW Polymer Electrolyte Membrane Fuel Cells stack as part of a hybrid power source

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IOP Conference Series: Earth and Environmental science 2019年第1期214卷

作者： M Dudek A Raźniak P Dudek M Korkosz P Wygonik P Bogusz W Frączek AGH University of Science and Technology Faculty of Energy and Fuels Mickiewicza Av. 30 30-059 Krakow Poland AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Mickiewicza Av. 30 30-059 Krakow Poland Rzeszow University of Technology Faculty of Electrical and Computer Engineering W. Pola 2 35-959 Rzeszow Poland Rzeszow University of Technology The Faculty of Mechanical Engineering and Aeronautics Powstańców Warszawy 8 35-959 Rzeszow Poland Warsaw University of Technology Faculty of Power and Aeronautical Engineering Nowowiejska 24 00-665 Warsaw Poland

A 10-kW polymer electrolyte membrane fuel cell (PEMFC) stack was designed and built as part of a hybrid power source to supply a motor glider. The power of the PEMFC stack reached ~10 kW for the electrical parameters I = 61 A, U = 153 V. The time of operation of the stack under an electrical load close to 10 kW was strongly dependent on the pressure of the hydrogen fuel stored composite tanks, which could be varied from 220 bar for 30 min to 700 bar for 80 min. It was found that the electrical efficiency of the constructed 10-kW PEMFC stack was greater than 50%.

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Continuum-micromechanical modeling of microcapsules-based composites 5th

Continuum-micromechanical modeling of microcapsules-based co...

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5th Asia Conference on Mechanical and Materials Engineering, ACMME 2017

作者： Ahmed, Abdalla Sanada, Kazuaki Fanni, Mohamed Abd El-Moneim, Ahmed Department of Materials Science and Engineering Egypt-Japan University of Science and Technology Egypt Department of Mechanical Systems Engineering Toyama Prefectural University Japan Department of Mechatronics and Robotics Engineering Egypt-Japan University of Science and Technology Egypt Department of Production Engineering and Mechanical Design Faculty of Engineering Mansoura University Egypt

ISBN: (纸本)9783035712919

Microcapsules are used in a wide range of applications, especially in self-healing composite materials and phase change materials. There is a growing body of literature that recognizes the importance of reinforcement on the mechanical properties of composites, however the effect of microcapsules during service needs to be further investigated. In this study, numerical investigations were conducted to examine the effects of the various geometric parameters on the mechanical behavior of microcapsules-based composites. The effective Young’s modulus and Poisson’s ratio of core-shell microcapsules distributed in a continuous matrix were predicted. A detailed three-dimensional finite element modeling (FEM) was presented. The numerical results were compared with a hierarchical proposed analytical model for three-constituent composites. Good agreements were achieved. © 2017 Trans Tech Publications, Switzerland.

关键词： Phase change materials

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Wirelessely powered mobile sensor - Energy harvesting experiments

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Diagnostyka 2017年第1期18卷 37-44页

作者： Gonek, Przemyslaw Lisowski, Mateusz Uhl, Tadeusz AGH University of Science and Technology Faculty of Mechanical Engineering and Robotics Department of Robotics and Mechatronics Al. Mickiewicza 30 Krakow30-059 Poland

This paper presents an idea of wirelessly powered mobile sensors utilizing cloud management system similar to the swarm robotics. Sensors are based on the previously developed wireless passive sensors working with RFID protocol in the HF range. Preliminary research presented in this paper is related to the energy harvesting efficiency evaluation and the possibility to wirelessly power an electric motor. Performed experiments show that the magnetic field generated by the RFID reader antenna provides enough amount of energy not only to perform communication, measurements and computation, but to power the actuators as well. Achieved results state a base for further investigation in the area of wireless passive mobile sensors.

关键词： Energy harvesting

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A screw-less solution for snake-like robot assembly and sensor integration

A screw-less solution for snake-like robot assembly and sens...

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2017 International Conference on Advanced Mechatronic Systems, ICAMechS 2017

作者： Li, Guoyuan Verdru, Peter Li, Wei Zhang, Houxiang Gomez, Juan Gonzalez Department of Ocean Operations and Civil Engineering Faculty of Engineering Norwegian University of Science and Technology Postboks 1517 AalesundN-6025 Norway Robotics Lab Universidad Rey Juan Carlos Madrid Spain

ISBN: (纸本)9781538626023

Assembly or repair of snake-like robots are often time consuming and low efficiency. This paper presents a novel approach for module improvement that can efficiently integrate sensors, micro-controllers and batteries into the snakelike robot, without needing of any tools. The implementation is built upon the GZ-I module-an open frame structure with only servo motor involved. Based on the sliding mechanism, an intermediate module accommodating two infrared sensors, one force sensor, one battery and one micro-controller, together with a terminal module used for mounting infrared sensor at each end of the snake-like robot is designed. Thus, screw-less assembling a snake-like robot can be achieved. In addition, a circuit board is developed for the micro-controller and peripherals connection. A master-slave software framework taking advantage of wireless communication capability of the microcontroller is implemented, enabling remote control/monitoring of the snake-like robot. Through a case study of sidewinding locomotion, the screw-less solution is proven to be applicable on the snake-like robot. © 2017 IEEE.

关键词： Screws

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Sensorless nonlinear control of fed-batch Escherichia coli cultivation bioprocess using the state-dependent approach 12th

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12th Portuguese Conference on Automatic Control, CONTROLO 2016

作者： Iratni, Abdelhamid Araújo, Rui Rastegar, Saeid Mostefai, Mohammed Faculty of Science and Technology Electrical Engineering Department University of Bordj Bou Arreridj El Anasser Algeria Department of Electrical and Computer Engineering Institute for Systems and Robotics University of Coimbra Coimbra Portugal Automatic Control Laboratory of Setif Electrical Engineering Department Faculty of Technology University of Setif1 Sétif Algeria

ISBN: (纸本)9783319436708

The cultivation of Escherichia coli bacteria is widely used by geneticists and biopharmaceuticals to produce medicines and vaccines. In such industries, Bioprocesses are known by their harsh environment and very expensive physical sensors. This paper deals with nonlinear estimation and control of fed-batch Escherichia coli bioprocess. Enhancing the process performance and maximizing its efficiency by optimizing the control of Escherichia coli cultures depends on the availability of appropriate online sensors for the main culture components. In this study, an innovative method for nonlinear estimation and control of bioprocesses is designed and assessed. The new algorithm for control and estimation of Escherichia coli bioprocess states, based on the State-Dependent Riccati Equation technique, is validated by numerical simulation. The results obtained clearly demonstrate the effectiveness of the proposed technique for Biosystems in measuring, monitoring, and control of their natural nonlinear dynamics. © Springer International Publishing Switzerland 2017.

关键词： Extended Kalman filters

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