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TechRxiv 2023年

作者： Ndjiongue, Alain Richard Ngatched, Telex M.N. Dobre, Octavia A. Haas, Harald Shin, Hyundong The Faculty of Engineering and Applied Science Memorial University of Newfoundland Canada The Department of Electrical and Computer Engineering McMaster University Canada The LiFi Research and Development Center Dpt. Electronic and Electrical Engineering The University of Strathclyde Glasgow United Kingdom The School of Electronics and Information Kyung Hee University 1 Seocheon Kihung Kyungki Yongin446-701 Korea Republic of

Due to their advantages and role in the beyond fifth-generation mobile network, free-space optical (FSO) communication systems continue to gain attention. The line-of-sight (LoS) link in FSO communications is fundamental as it delivers all the power detected by the user. Therefore, its obstruction is detrimental to the transmission system. In the event of an obstruction, the LoS requirements can be met by introducing the reconfigurable intelligent surface (RIS) technology. However, with the implementation of an RIS infrastructure, FSO channels are divided into two sub-channels, creating an inherent diversity end-to-end (e2e) channel model. In this paper, leveraging on the Meijer G-functions, which are symbolic representations of mathematical functions, we derive symbolic models for e2e RIS-assisted FSO systems that are built on the probability density functions (PDFs) of the fading model characterizing the sub-channels. We study some of the most popular models, derive closed-form expressions of PDFs, cumulative distributions, and moment-generating functions that are further exploited to analyze systems’ performance. By comparing scenarios in which the sub-channels are similar and different, we provide a clear understanding of how the overall RIS-assisted FSO channel behaves, along with comparative results based on commonly used models. © 2023, CC BY.

关键词： Probability density function

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Use of QUIC Protocol for Efficient Data Transmission Over Satellite in Emergency Scenario

Use of QUIC Protocol for Efficient Data Transmission Over Sa...

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International Conference on information and Communication Technologies for Disaster Management (ICT-DM)

作者： Armir Bujari Mirko Franco Claudio E. Palazzi Mattia Quadrini Cesare Roseti Francesco Zampognaro Department of Computer Science and Engineering University of Bologna Bologna Italy Department of Mathematics University of Padua Padua Italy Research and Development RomARS S.r.l. Rome Italy Electronics Engineering Dpt. University of Rome “Tor Vergata” Rome Italy

During emergency situations, reliable and fast communication is crucial for an effective response and coordination of recovery and rescue operations. However, regular communication means may not be always available nor reliable. In this scenario, constellations of Low Earth Orbit satellites can offer high bandwidth capabilities with (relatively) low latency, making them ideal for supporting disaster management teams on the ground and complementing (or replacing) terrestrial telecommunication infrastructures. In this context, the use of the recently defined QUIC protocol can provide the possibility to seamlessly switch from ground communication to satellite ones when needed. In this paper, we discuss the case study of satellite communication in an emergency scenario, assessing via a simulation study the benefits achievable by QUIC under varying queuing parameters and congestion control algorithm behavior.

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The MPEG-7 query format: a new standard in progress for multimedia query by content

The MPEG-7 query format: a new standard in progress for mult...

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International Symposium on Communications and information Technologies (ISCIT)

作者： Kevin Adistambha Mario Doeller Ruben Tous Matthias Gruhne Masanori Sano Chrisa Tsinaraki Stavros Christodoulakis Kyoungro Yoon Christian H. Ritz Ian S. Burnett School of Electrical Computer and Telecommunications Engineering University of Wollongong Australia Department Distributed Information Technology University of Passau Passau Germany Dpt. d'Arquitectura de Computadors Universitat Poliltècnica de Catalunya Barcelona Spain Department Metadata Fraunhofer IDMT Germany NHK Science and Technology Research Laboratories Japan Laboratory of Distributed Multimedia Information Systems & Applications Technical University of Crete Greece School of Computer Science and Engineering Konkuk University Seoul South Korea

In recent years, the amount of Internet accessible digital audiovisual media files has vastly increased. Therefore the need to describe the media (by way of metadata) has also increased significantly. MPEG-7 (finalized in 2001) provides a comprehensive and rich metadata standard for the description of multimedia content. Unfortunately, a standardized query format does not exist for MPEG-7, or other multimedia metadata. Such a standard would provide for communications between querying clients and databases, supporting cross-modal and cross-media retrieval. The lSO/lEC SC29WG11 committee decided therefore to contribute to this application space by adding such functionality as a new part of the MPEG-7 series of standards. In response to a Call for Proposals, six proposals were submitted. This paper describes the strengths of each proposal as well as the resulting draft standard for the MPEG-7 query format.

关键词： MPEG 7 Standard Multimedia databases Electronic mail Proposals Database languages Multimedia systems Telecommunication computing Identity-based encryption ISO IEC

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A mixture of experts model for predicting persistent weather patterns

arXiv

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arXiv 2019年

作者： Pérez-Ortiz, M. Gutiérrez, P.A. Tino, P. Casanova-Mateo, C. Salcedo-Sanz, S. Computer Laboratory University of Cambridge United Kingdom Dpt. of Computer Science and Numerical Analysis University of Córdoba Spain School of Computer Science University of Birmingham United Kingdom Department of Civil Engineering: Construction Infrastructure and Transport Universidad Politécnica de Madrid Madrid Spain Department of Signal Processing and Communications University of Alcalá Spain

Weather and atmospheric patterns are often persistent. The simplest weather forecasting method is the so-called persistence model, which assumes that the future state of a system will be similar (or equal) to the present state. Machine learning (ML) models are widely used in different weather forecasting applications, but they need to be compared to the persistence model to analyse whether they provide a competitive solution to the problem at hand. In this paper, we devise a new model for predicting low-visibility in airports using the concepts of mixture of experts. Visibility level is coded as two different ordered categorical variables: cloud height and runway visual height. The underlying system in this application is stagnant approximately in 90% of the cases, and standard ML models fail to improve on the performance of the persistence model. Because of this, instead of trying to simply beat the persistence model using ML, we use this persistence as a baseline and learn an ordinal neural network model that refines its results by focusing on learning weather fluctuations. The results show that the proposal outperforms persistence and other ordinal autoregressive models, especially for longer time horizon predictions and for the runway visual height variable. Copyright © 2019, The Authors. All rights reserved.

关键词： Weather forecasting

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Learning System Based on Contextual Awareness for Clinical Practice in Nursing Courses

Learning System Based on Contextual Awareness for Clinical P...

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International Conference on Advanced Learning Technologies (ICALT)

作者： Jorge Gómez Gómez J.F. Huete Velssy Hernandez Riaño Department of Systems Engineering - Research Group GNOCIX Universidad del Sinu-Monteria Colombia Dpt. Computer Science and Artificial Intelligence University of Granada-CITIC_UGR Spain Research Group SOCRATES Universidad de Cordoba-Monteria Colombia

The ubiquitous learning is used as a means of supporting teaching processes by means of the use of mobile and wireless communication technologies, sensors and tracking mechanisms / tracking, working together to integrate students with their environment. The process of clinical learning for nursing students may be the main cause of increased stress on teachers and students, given the problematic nature of the patients. This paper presents an ubiquitous learning system based on active learning methodology that provides context awareness support for nursing courses. An experiment with control and experimental groups with nursing students demonstrates that for theoretical concepts to be successfully transferred into practice, the context of practice needs to be considered.

关键词： Medical services Context Education Mobile communication Learning systems Mobile handsets Personal digital assistants

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A bio-tribological methodology to investigate nanostructured Ti based composites for hip-joints

A bio-tribological methodology to investigate nanostructured...

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Society of Tribologists and Lubrication Engineers Annual Meeting and Exhibition 2015

作者： Georgiou, E.P. Leuven, K.U. Drees, D. Dosta, S. Matteazzi, P. Kusinski, J. Celis, J.-P. B-3001 Leuven Belgium - Falex Tribology NV Kasteelpark Arenberg 44Wingepark 23B Rotselaar Belgium Falex Tribology NV Rotselaar Belgium Dpt. Ciencia dels Materials i Enginyeria Metal.lurgica Universitat de Barcelona Marti I Franques 1 Barcelona Spain Italy Faculty of Metal Engineering and Industrial Computer Science University of Mining and Metallurgy Mickiewicza 30 Ave. Cracow Poland

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Analysis of RATAN-600 radio telescope antenna using the MLPO algorithm

Analysis of RATAN-600 radio telescope antenna using the MLPO...

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作者： Letrou, C. Parrot, C. Baruh, A. Khaikin, V. Lebedev, M. Boag, A. Institut Telecom TELECOM SudParis 9 Rue Charles Fourier 91011 Evry Cedex France School of Electrical Engineering Tel Aviv University Tel Aviv 69978 Israel Special Astrophysical Observatory RAS Russia CNRS Lab. SAMOVAR 9 Rue Charles Fourier 91011 Evry Cedex France Computer Science Dpt. 9 Rue Charles Fourier 91011 Evry Cedex France

A fast and adaptive near-field physical optics algorithm is developed for the analysis of general multi-reflector antenna systems. The algorithm is applied to the radiation pattern computation of an extremely large an... 详细信息

ISBN: (纸本)9788882020743

关键词： Millimeter waves

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Performance analysis of pools in soft real-time design architectures

Performance analysis of pools in soft real-time design archi...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication Systems (MASCOTS)

作者： C. Juiz R. Puigjaner H. Perros Dpt. Ciències Matemàtiques i informàticaEscola Politècnica Superior Universitat de les Illes Balears Palma Spain Computer Science Department College of Engineering North Carolina State University Raleigh NC USA

Architectures for the design of soft real-time systems typically do not facilitate the use of performance tools that will enable a designer to analyse the performance of the system that is being designed. Intercommunication data areas, whose behaviours are characterised by interaction protocols, are the building blocks of many soft real-time systems. The interaction protocols are grouped into families depending on their reading/writing functionality. We present two members belonging to the pool family. These components transfer data among tasks without synchronisation in a non-selective manner. In the basic pool model no task has priority over other tasks whereas in the priority pool model writer tasks have non-preemptive priority over reader tasks. Both queueing models are analysed approximately using a decomposition technique. Basic pool modelling is based on single-server and multi-server semaphore queues. Priority pool modelling is inspired on non-preemptive priority classical analysis.

关键词： Performance analysis Real time systems Protocols Design methodology Software systems Software design computer science Educational institutions USA Councils Timing

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Using conceptors to manage neural long-term memories for temporal patterns

The Journal of Machine Learning Research

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The Journal of Machine Learning Research 2017年第1期18卷

作者： Herbert Jaeger Dpt. of Computer Science and Electrical Engineering Jacobs University Bremen Bremen Germany

Biological brains can learn, recognize, organize, and re-generate large repertoires of temporal patterns. Here I propose a mechanism of neurodynamical pattern learning and representation, called conceptors, which offers an integrated account of a number of such phenomena and functionalities. It becomes possible to store a large number of temporal patterns in a single recurrent neural network. In the recall process, stored patterns can be morphed and "focussed". Parametric families of patterns can be learnt from a very small number of examples. Stored temporal patterns can be content-addressed in ways that are analog to recalling static patterns in Hopfield networks.

关键词： neural dynamics neural long-term memory recurrent neural network temporal pattern learning

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On deploying the artificial sport trainer into practice

arXiv

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arXiv 2021年

作者： Fister, Iztok Iglesias, Andres Deb, Suash Fister, Iztok Galvez, Akemi Fister, Dušan Faculty of Electrical Engineering and Computer Science University of Maribor SI- Maribor2000 Slovenia Dpt. of Applied Mathematics and Computational Sciences University of Cantabria Santander39005 Spain IT & educational Consultant Ranchi Jharkhand India Faculty of Economics and Business University of Maribor MariborSI-2000 Slovenia

—Computational Intelligence methods for automatic generation of sport training plans in individual sport disciplines have achieved a mature phase. In order to confirm their added value, they have been deployed into practice. As a result, several methods have been developed for generating well formulated training plans on computers automatically that, typically, depend on the collection of past sport activities. However, monitoring the realization of the performed training sessions still represents a bottleneck in automating the process of sport training as a whole. The objective of this paper is to present a new low-cost and efficient embedded device for monitoring the realization of sport training sessions that is dedicated to monitor cycling training sessions. We designed and developed a new bike computer, i.e. the AST-Monitor, that can be mounted easily on almost every bicycle. The aforementioned bike computer is based on the Raspberry Pi device that supports different external sensors for capturing the data during the realization of sport training sessions. An adjusted GUI tailored to the needs of athletes is developed, along with the hardware. The proof of concept study, using the AST-Monitor in practice, revealed the potential of the proposed solution for monitoring of realized sport training sessions automatically. The new device also opens the door for the future utilization of Artificial Intelligence in a wide variety of sports. Copyright © 2021, The Authors. All rights reserved.

关键词： Sports

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