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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： Vasileios Leon Anastasios Xynos Dimitrios Soudris George Lentaris Ruben Domingo Arturo Perez David Gonzalez-Arjona Isabelle Conway David Merodio Codinachs National Technical University of Athens School of Electrical and Computer Engineering Athens Greece Department of Informatics and Computer Engineering University of West Attica Athens Greece GMV Aerospace and Defence SAU Flight Segment and Robotics Business Unit Madrid Spain European Space Agency European Space Research and Technology Centre Noordwijk Netherlands

ISBN: (数字)9798350377200

ISBN: (纸本)9798350377217

The emergence of demanding space applications has modified the traditional landscape of computing systems in space. When reliability is a first-class concern, in addition to enhanced performance-per-Watt, radiation-hardened FPGAs are favored. In this context, the current paper evaluates the first European radiation-hardened SoC FPGA, i.e., NanoXplore's NG-ULTRA, for accelerating high-performance DSP algorithms from space applications. The proposed development & testing methodologies provide efficient implementations, while they also aim to test the new NG-ULTRA hardware and its associated software tools. The results show that NG-ULTRA achieves competitive resource utilization and performance, constituting it as a very promising device for space missions, especially for Europe.

关键词： Performance evaluation Systematics Space missions Software algorithms Europe Resource management Reliability Software tools Field programmable gate arrays Testing

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Novel market designs for flexibility trading: a scalability analysis for the day-ahead market

Novel market designs for flexibility trading: a scalability ...

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14th Mediterranean Conference on Power Generation Transmission, Distribution and Energy Conversion (MEDPOWER 2024)

作者： Georgios K. Papazoglou Aikaterini A. Forouli Emmanouil A. Bakirtzis Pandelis N. Biskas Anastasios G. Bakirtzis Natalia Fano School of Electrical & Computer Engineering Aristotle University of Thessaloniki Greece Department of Research Technology & Development Hellenic Energy Exchange S.A Athens Greece Department of Computer Informatics and Telecommunications Engineering International Hellenic University Serres Greece Innovation Department Estabanell y Pahisa Energia S.A.U Granollers Spain

ISBN: (数字)9781837242689

The aim of this paper is to gain evidence of the scalability of flexibility trading mechanisms by executing large scale simulations for day-ahead trading of flexibility. The objective is to allow the quantification of the impact of flexibility provision at the distribution level and prove the effectiveness of flexibility trading in solving grid issues, delivering in this way scalable operational mechanisms ready to be integrated in EU electricity markets. Initially, the proposed market mechanism is validated by using dummy grid data and considering virtual DSO needs. Next, real-life simulations are executed using operational grid data from the region of Catalonia, Spain. Simulations results indicate that the proposed mechanism exhibits satisfactory scalability and accuracy and is able to efficiently address issues of the distribution network safeguarding the security of supply and quality of service in the distribution grid.

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Color Based Person Tracking with Illumination Compensation by using Multiple Statistics of Scene

Color Based Person Tracking with Illumination Compensation b...

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International Symposium on Soft Computing and Intelligent Systems (SCIS)

作者： Motonori Doi Akihiro Tsujimoto Akira Kimachi Shogo Nishi Norikazu Ikoma Dept. of Telecommunications and Computer Networks Osaka Electro-Communication University Neyagawa Japan Graduate School of Engineering Osaka Electro-Communication University Neyagawa Japan Dept. of Engineering Informatics Osaka Electro-Communication University Neyagawa Japan Dept. of Electrical Electronics and Communication Engineering Nippon Institute of Technology Saitama Japan

ISBN: (纸本)9781538626344;9781538626337

Person tracking is an important technology for several applications of video surveillance, robot vision and human interface. Key features of the person tracking are the shape and color. Especially, color information provides important information to distinguish individuals in scenes including multiple persons. However, color information is influenced by illumination color. In this paper, we propose a novel person tracking method based on color tracking with illumination color compensation. The illumination color is estimated from three statistical features obtained from the whole scene. The scene statistics are an average value, a maximum value and "gray-edge" value that means an average of edge component of the scene. Person is tracked as the concentration of registered colors by using the particle filter. In the proposed method, the positions and velocity of points are defined as a system model of the particle filter. Three likelihoods of each particle are calculated by colors compensated by three scene statistics. Then, the maximum likelihood of three likelihoods is selected as the likelihood of the particle. We conducted experiments for evaluation of the proposed method. The results showed the improvement of the accuracy of tracking in comparing with the previous method that compensated color by only average value of the scene.

关键词： Image color analysis Lighting Target tracking Particle filters Color Image sequences Clothing

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Equalization of congestion probabilities in a W-CDMA cell supporting calls of finite sources with interference cancellation

Equalization of congestion probabilities in a W-CDMA cell su...

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International Symposium on Communication Systems, Networks and Digital Signal Processing, CNSDSP

作者： I. D. Moscholios M. A. Katsiva G. A. Kallos V. G. Vassilakis M. D. Logothetis Dept. of Informatics & Telecommunications University of Peloponnese Tripolis Greece BT Technology Service and Operations Ipswich U.K Dept. of Electronic Engineering University of Surrey U.K Dept. of Electrical & Computer Engineering University of Patras Tripolis Greece

In this paper, we consider a multirate teletraffic loss model for the calculation of congestion probabilities in a Wideband Code Division Multiple Access (W-CDMA) cell that utilizes the Bandwidth Reservation (BR) policy and supports calls generated by a finite number of users. The BR policy is used particularly to equalize congestion probabilities among calls of different service-classes. In the proposed model we consider multiple access interference, the notion of local blocking, user's activity and interference cancellation. We show that the calculation of congestion probabilities is based on approximate but recursive formulas, whose accuracy is verified through simulation and found to be quite satisfactory.

关键词： Multiaccess communication Interference Bandwidth Noise Spread spectrum communication Integrated circuits Probability

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LE3D: A Lightweight Ensemble Framework of Data Drift Detectors for Resource-Constrained Devices

LE3D: A Lightweight Ensemble Framework of Data Drift Detecto...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Ioannis Mavromatis Adrian Sanchez-Mompo Francesco Raimondo James Pope Marcello Bullo Ingram Weeks Vijay Kumar Pietro Carnelli George Oikonomou Theodoros Spyridopoulos Aftab Khan Bristol Research and Innovation Laboratory (BRIL) Toshiba Europe Ltd. Bristol UK Department of Electrical and Electronic Engineering University of Bristol Bristol UK Department of Engineering Mathematics University of Bristol Bristol UK School of Computer Science and Informatics Cardiff University Cardiff UK

Data integrity becomes paramount as the number of Internet of Things (ioT) sensor deployments increases. Sensor data can be altered by benign causes or malicious actions. Mechanisms that detect drifts and irregularities can prevent disruptions and data bias in the state of an IoT application. This paper presents LE3D, an ensemble framework of data drift estimators capable of detecting abnormal sensor behaviours. Working collaboratively with surrounding ioT devices, the type of drift (natural/abnormal) can also be identified and reported to the end-user. The proposed framework is a lightweight and unsupervised implementation able to run on resource-constrained IoT devices. Our framework is also generalisable, adapting to new sensor streams and environments with minimal online reconfiguration. We compare our method against state-of-the-art ensemble data drift detection frameworks, evaluating both the real-world detection accuracy as well as the resource utilisation of the implementation. Experimenting with real-world data and emulated drifts, we show the effectiveness of our method, which achieves up to 97% of detection accuracy while requiring minimal resources to run.

关键词： Performance evaluation Data privacy Scalability Data integrity Distributed databases Detectors Internet of Things

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Investigation of the separation zone for split-domain light field visualization

Investigation of the separation zone for split-domain light ...

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International Scientific-Professional Conference on Information Technology (IT)

作者： Kamran Javidi Maria G. Martini Peter A. Kara Department of Computer Science Wireless Multimedia and Networking Research Group School of Computer Science and Mathematics Faculty of Engineering Computing and the Environment Kingston University Penrhyn Road Campus Kingston upon Thames London UK Department of Networked Systems and Services Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Budapest Hungary

Light field visualization commonly provides a single content over the entire field of view. However, the angularly-selective nature of the technology enables the simultaneous visualization of different contents at different viewing angles. Yet segmenting the valid viewing area comes with content interference as well in forms of separation zones, resulting invalid viewing domains. In this paper, we introduce a study on the separation zone of split-domain light field visualization. We created a static-content-based scenario in which we split the valid viewing area into two distinct domains, with a separation zone in between them. This was achieved by merging two light field contents in the middle with an instantaneous switch. The resulting visualization on a light field display was captured by a DSLR camera from two viewing distances, and it was compared to the crosstalk effect caused by insufficient angular resolution.

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Methods and tools for automatic or semi-automatic recognition of selected emotions using machine learning algorithms

Methods and tools for automatic or semi-automatic recognitio...

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Progress in Applied electrical engineering (PAEE)

作者： Piotr Schneider Dariusz Mikołajewski Anna Bryniarska Magdalena Igras-Cybulska Artur Cybulski Walery Marcinowicz Maciej Janiszewski Aleksandra Kawala-Sterniuk Department of Neuroinformatics and Biomedical Engineering Institute of Computer Science Maria Curie-Sklodowska University Lublin Poland Hishoo Sp. z o.o Gdynia Poland Faculty of Computer Science Kazimierz Wielki University Bydgoszcz Poland Faculty of Electrical Engineering Automatic Control and Informatics Opole University of Technology Opole Poland

ISBN: (数字)9798331527563

ISBN: (纸本)9798331527570

Automatic or semi-automatic recognition of selected emotions using Machine Learning (ML) algorithms requires practical, fast and accurate implementation of the steps involved in acquiring the actual signals (e.g. speech, facial expression, posture and body movements), recording them in the form of an optimal feature vector/matrix, correctly interpreting the above data and reproducing and generalising this process within the ML system. Depending on the accuracy and speed required and the degree of its ‘invasiveness’ (e.g. by attaching sensors to the user’s body), single or multi-modal interpretations of biometric signals associated with different groups of emotions are possible. This group of studies, despite their relative non-invasiveness, requires the caution prescribed by the Artificial Intelligence (AI) Act and RODO Act and the possibility of being replaced (if necessary) by alternatives. This article aims to analyse the opportunities and risks associated with this group of technologies, with a particular focus on directions for further development.

关键词： Emotion recognition Machine learning algorithms Accuracy Video on demand Speech recognition Machine learning Feature extraction Recording Convolutional neural networks Web sites

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An FPGA-based hardware accelerator for energy-efficient bitmap index creation

arXiv

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arXiv 2018年

作者： Nguyen, Xuan-Thuan Hoang, Trong-Thuc Nguyen, Hong-Thu Inoue, Katsumi Pham, Cong-Kha Department of Electrical and Computer Engineering University of Toronto TorontoONM5S 1A1 Canada Department of Communication Engineering and Informatics University of Electro-Communications Tokyo182-8585 Japan Advanced Original Technologies Company Chiba277-0827 Japan

Bitmap index is recognized as a promising candidate for online analytics processing systems, because it effectively supports not only parallel processing but also complex and multi-dimensional queries. However, bitmap index creation is a time-consuming task. In this paper, by taking full advantage of massive parallel computing of field-programmable gate array (FPGA), two hardware accelerators of bitmap index creation, namely BIC64K8 and BIC32K16, are originally proposed. Each of the accelerator contains two primary components, namely an enhanced content-addressable memory and a query logic array module, which allow BIC64K8 and BIC32K16 to index 65 536 8-bit words and 32 768 16-bit words in parallel, at every clock cycle. The experimental results on an Intel Arria V 5ASTFD5 FPGA prove that at 100 MHz, BIC64K8 and BIC32K16 achieve the approximate indexing throughput of 1.43 GB/s and 1.46 GB/s, respectively. The throughputs are also proven to be stable, regardless the size of the data sets. More significantly, BIC32K16 only consumes as low as 6.76% and 3.28% of energy compared to the central-processing-unit- and graphic-processing-unit-based designs, respectively. Copyright © 2018, The Authors. All rights reserved.

关键词： Energy efficiency

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Towards Stagewise and Energy-Accuracy-balanced Client Selection and Resource Allocation over Dynamic Federated Learning Networks

Towards Stagewise and Energy-Accuracy-balanced Client Select...

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IEEE International Conference on Communications in China (ICCC)

作者： Minghong Wu Minghui Liwang Yuhan Su Yuliang Tang Zhenzhen Jiao Xianbin Wang School of Informatics Xiamen University Xiamen China College of Electronic and Information Engineering Tongji University Shanghai China School of Electronic Science and Engineering Xiamen University Xiamen China iF-Labs Beijing Teleinfo Technology Co. Ltd. CAICT China Dept. of Electrical and Computer Engineering Western University Ontario Canada

ISBN: (数字)9798350378412

ISBN: (纸本)9798350378429

Federated Learning (FL) represents a popular distributed learning architecture that facilitates data privacy by enabling clients (e.g., mobile devices) to train a FL model collaboratively without data sharing. Existing efforts mainly focus on accuracy, delay and energy consumption over a rather stable network with certain clients, with less emphasis on the impact of frequent decision-making processes during model training. Inspired by this, this paper considers a dynamic FL network with uncertain participation of clients, while we jointly optimize client selection and communication resource allocation to achieve a balance between energy cost and FL model accuracy, as proved to be NP-hard. To facilitate timely model training, we propose a prediction-based two-stage asynchronous programming mechanism, which decouples the problem in two subproblems, corresponding to two stages. In particular, the former stage determines some long-term clients which are more stable to join in prior to practical model training process, by estimating the online probability of clients. Then, the latter stage can be implemented by involving some temporary clients as backups when long-term ones are not able to show up. Such a well-designed mechanism offers a unique veiw on FL, while enabling a responsive and cost-effective decision-making process. Comprehensive simulations regarding both IID and non-IID data distributions on MNIST and CIFAR-10 datasets can prove our commendable performance on time efficiency, energy cost and accuracy.

关键词： Training Accuracy Costs Federated learning Decision making Programming Dynamic scheduling

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Development of High-Performance DSP Algorithms on the European Rad-Hard NG-ULTRA SoC FPGA

arXiv

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arXiv 2024年

作者： Leon, Vasileios Xynos, Anastasios Soudris, Dimitrios Lentaris, George Domingo, Ruben Perez, Arturo Gonzalez–Arjona, David Conway, Isabelle Codinachs, David Merodio National Technical University of Athens School of Electrical and Computer Engineering Athens Greece University of West Attica Department of Informatics and Computer Engineering Athens Greece GMV Aerospace and Defence SAU Flight Segment and Robotics Business Unit Madrid Spain European Space Agency European Space Research and Technology Centre Noordwijk Netherlands

The emergence of demanding space applications has modified the traditional landscape of computing systems in space. When reliability is a first-class concern, in addition to enhanced performance-per-Watt, radiation-hardened FPGAs are favored. In this context, the current paper evaluates the first European radiation-hardened SoC FPGA, i.e., NanoXplore’s NG-ULTRA, for accelerating high-performance DSP algorithms from space applications. The proposed development & testing methodologies provide efficient implementations, while they also aim to test the new NG-ULTRA hardware and its associated software tools. The results show that NG-ULTRA achieves competitive resource utilization and performance, constituting it as a very promising device for space missions, especially for Europe. Copyright © 2024, The Authors. All rights reserved.

关键词： Space applications

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