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24th Pan-Hellenic Conference on Informatics, PCI 2020

作者： Tsoukas, Vasileios Gkogkidis, Anargyros Kakarountas, Athanasios Intelligent Systems Laboratory Dpt. of Computer Science and Biomedical Informatics University of Thessaly Lamia Greece

ISBN: (纸本)9781450388979

The rapid evolution of mobile phone devices resulted in the conversion of a simple communication device to a complicated small portable computer offering a plethora of features and services. Sensitive data are now stored in devices that can be easily lost, stolen, or compromised. A mobile user survey was conducted to get a better understanding of what the users think about the data stored in their devices, the authentication methods they use, and their willingness to try a new one. This paper presents the results derived from 81 mobile users. The results reveal that the users still use text-based authentication methods, with the preferred method being the Pin-Code. The bio-metric authentication adopters have a better understanding of what sensitive data are and feel they are not fully protected. The analysis also revealed that the majority of users, regardless of their preferred authentication method are willing to try new authentication methods that promise to offer a higher level of security for their personal data. © 2020 ACM.

关键词： Sensitive data

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A Field Study of an Extinguishing Material for use in Forest and Wildland-Urban Interface Fires

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Journal of engineering science and Technology Review 2024年第1期17卷 116-121页

作者： Chalaris, Michail Iliopoulos, Nikolaos Pallikarakis, Christos Kolaitis, Dionysios Hephaestus Laboratory Dpt. of Chemistry School of Science International Hellenic University Ag. Loukas Kavala65404 Greece Laboratory of Heterogeneous Mixtures and Combustion Systems School of Mechanical Engineering National Technical University of Athens Heroon Polytechniou St. 9 Zografou Athens15772 Greece

The fire extinguishing performance, in a simulation with field experiment of wildland fire, of liquid BONPET and pure water was studied. The results show that 6% BONPET liquid has better performance than pure water. The fire extinguishing simulation shows that the extinguishing performance of liquid BONPET 6% reduces the temperature at the burning area more quickly, showing a better cooling effect than water. Furthermore, shows that achieved 80% water saving and 60% faster extinguishing with the use of 6% BONPET liquid. Moreover, it has been observed that the utilization of BONPET liquid for fire suppression leads to reduced collateral damage. This is attributed to the unique properties of BONPET liquid, as its non-decomposed components persist on the surface following extinguishment. These residual components possess the capability to disintegrate and facilitate surface cooling in the event of a minor temperature rise. © 2024 School of science, IHU. All rights reserved.

关键词： Fires

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The DEVStone Metric: Performance Analysis of DEVS Simulation Engines

arXiv

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arXiv 2023年

作者： Cárdenas, Román Henares, Kevin Arroba, Patricia Risco-Martín, José L. Wainer, Gabriel A. Integrated Systems Laboratory Universidad Politécnica de Madrid Madrid Spain Dept. of Systems and Computer Engineering Carleton University OttawaON Canada Dpt. of Computer Architecture and Automation Universidad Complutense de Madrid Madrid Spain Center for Computational Simulation Universidad Politécnica de Madrid Madrid Spain

The DEVStone benchmark allows us to evaluate the performance of discrete-event simulators based on the DEVS formalism. It provides model sets with different characteristics, enabling the analysis of specific issues of simulation engines. However, this heterogeneity hinders the comparison of the results among studies, as the results obtained on each research work depend on the chosen subset of DEVStone models. We define the DEVStone metric based on the DEVStone synthetic benchmark and provide a mechanism for specifying objective ratings for DEVS-based simulators. This metric corresponds to the average number of times that a simulator can execute a selection of 12 DEVStone models in one minute. The variety of the chosen models ensures we measure different particularities provided by DEVStone. The proposed metric allows us to compare various simulators and to assess the impact of new features on their performance. We use the DEVStone metric to compare some popular DEVS-based simulators. © 2023, CC BY-SA.

关键词： Discrete event simulation

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A sub-1V CMOS Instrumentation Amplifier for an AFE Interfacing with Sensors 5

A sub-1V CMOS Instrumentation Amplifier for an AFE Interfaci...

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5th International Young Engineers Forum in Electrical and computer engineering, YEF-ECE 2021

作者： Neves, Francisco Oliveira, João P. Oliveira, Henrique Dpt. of Electrical and Computer Engineering NOVA School of Science and Technology Caparica Portugal CTS UNINOVA Caparica Portugal Instituto de Telecomunicações Lisboa Portugal Instituto Politécnico de Beja Beja Portugal

ISBN: (纸本)9781665412643

This paper presents the design of a low-noise capacitively-coupled instrumentation amplifier with a sub-1V power supply, which is suitable for low-power sensor data acquisition systems. This amplifier is part of an Analog Front-end (AFE) which is implemented in a standard 130nm bulk CMOS technology. Beside the high-impedance input amplifier, the AFE includes a programmable switch-capacitor bandpass filter and a sigma-delta modulator. A chopper modulation technique is implemented to further reduce the flicker noise, with a positive feedback network to compensate the resulting low input impedance. The preliminary post-layout simulated results of the instrumentation amplifier achieves a total power consumption of 2.6µW, with an open loop gain of 87dB and a GBW of 584kHz and with the input reffered noise of 4.6µVrms and a NEF value of 4. The maximum CMRR of the amplifier is 101dB and the PSRR minus is greater than 66dB. For a sub 1V power supply, the input frequency range is up to 10 kHz. © 2021 IEEE.

关键词： Bandpass filters

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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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Multi-Objective Genetic Algorithm for the Joint Optimization of Energy Efficiency and Rule Reduction in Software-Defined Networks 11

Multi-Objective Genetic Algorithm for the Joint Optimization...

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11th International Conference on Network of the Future, NoF 2020

作者： Galan-Jimenez, Jaime Berrocal, Javier Herrera, Juan Luis Polverini, Marco University of Extremadura Dpt. of Computer Systems and Telematics Engineering Spain University of Rome 'Sapienza' Diet Department Rome Italy

ISBN: (纸本)9781728180557

Although the use of Ternary Content-Addressable Memories (TCAMs) in the flow tables of the Software-Defined Network (SDN) switches increases the efficiency of packets matching procedure, drawbacks such as their large power consumption and the limitation on the number of flow rules that can be installed must be taken into account. This paper tackles the joint problem of power consumption and TCAM size limitation in SDN. By exploiting the Rate Adaptation technique and compression methods, a Multi-Objective Genetic Algorithm is proposed to practically solve it. Simulations on a real network topology show that our proposed solution outperforms other state-of-The-Art approaches, both in terms of power saving gains (20% at non-peak TM) and maximum TCAM utilization (5%). © 2020 IEEE.

关键词： Energy efficiency

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Active flow control for external aerodynamics: From micro air vehicles to a full aircraft in stall 4

Active flow control for external aerodynamics: From micro ai...

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4th Madrid Summer School on Turbulence

作者： Lehmkuhl, Oriol Lozano-Durán, Adrián Rodriguez, Ivette Dpt. of Computer Applications in Science and Engineering Barcelona Supercomputing Center Spain Center for Turbulence Research Stanford University United States Dpt. of Heat Engines Universitat Politecnica de Catalunya Spain

We investigate the aerodynamic performance of active flow control of airfoils and wings using synthetic jets with zero net-mass flow. The study is conducted via wall-resolved and wall-modeled large-eddy simulation using two independent CFD solvers: Alya, a finite-element-based solver;and charLES, a finite-volume-based solver. Our approach is first validated in a NACA4412, for which numerical and experimental results are already available in the literature. The performance of synthetic jets is evaluated for two flow configurations: a SD7003 airfoil at moderate Reynolds number with laminar separation bubble, which is representative of Micro Air Vehicles, and the high-lift configuration of the JAXA Standard Model at realistic Reynolds numbers for landing. In both cases, our predictions indicate that, at high angles of attack, the control successfully eliminates the laminar/turbulent recirculations located downstream the actuator, which increases the aerodynamic performance. Our efforts illustrate the technology-readiness of large-eddy simulation in the design of control strategies for real-world external aerodynamic applications. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Large eddy simulation

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Recognition of food-texture attributes using an in-ear microphone

arXiv

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arXiv 2021年

作者： Mars, Monica Diou, Christos Papapanagiotou, Vasileios van den Boer, Janet Delopoulos, Anastasios Multimedia Understanding Group Dpt. Electrical and Computer Engineering Faculty of Engineering Aristotle University of Thessaloniki Greece Department of Informatics and Telematics Harokopio University of Athens Greece Dpt. of Biomedical Signals and Systems Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Netherlands Division of Human Nutrition and Health Wageningen University Netherlands

Food texture is a complex property;various sensory attributes such as perceived crispiness and wetness have been identified as ways to quantify it. Objective and automatic recognition of these attributes has applications in multiple fields, including health sciences and food engineering. In this work we use an in-ear microphone, commonly used for chewing detection, and propose algorithms for recognizing three food-texture attributes, specifically crispiness, wetness (moisture), and chewiness. We use binary SVMs, one for each attribute, and propose two algorithms: one that recognizes each texture attribute at the chew level and one at the chewing-bout level. We evaluate the proposed algorithms using leave-one-subject-out cross-validation on a dataset with 9 subjects. We also evaluate them using leave-one-food-type-out cross-validation, in order to examine the generalization of our approach to new, unknown food types. Our approach performs very well in recognizing crispiness (0.95 weighted accuracy on new subjects and 0.93 on new food types) and demonstrates promising results for objective and automatic recognition of wetness and chewiness. Copyright © 2021, The Authors. All rights reserved.

关键词： Wearable technology

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Symbolic Meta-Modeling of RIS-Assisted FSO Communication Channels

TechRxiv

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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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Towards a Blockchain and Opportunistic Edge Driven Metaverse of Everything

arXiv

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arXiv 2024年

作者： Fraga-Lamas, Paula Lopes, Sérgio Ivan Fernández-Caramés, Tiago M. Dpt. of Computer Engineering Centro de investigación CITIC Faculty of Computer Science Universidade da Coruña A Coruña15071 Spain ADiT-Lab Instituto Politécnico de Viana do Castelo Viana do Castelo4900-348 Portugal CiTin Centro de Interface Tecnológico Industrial Arcos de Valdevez4970-786 Portugal IT—Instituto de Telecomunicações Campus Universitário de Santiago Aveiro3810-193 Portugal

Decentralized Metaverses, built on Web 3.0 and Web 4.0 technologies, have attracted significant attention across various fields. This innovation leverages blockchain, Decentralized Autonomous Organizations (DAOs), Extended Reality (XR) and advanced technologies to create immersive and interconnected digital environments that mirror the real world. This article delves into the Metaverse of Everything (MoE), a platform that fuses the Metaverse concept with the Internet of Everything (IoE), an advanced version of the Internet of Things (IoT) that connects not only physical devices but also people, data and processes within a networked environment. Thus, the MoE integrates generated data and virtual entities, creating an extensive network of interconnected components. This article seeks to advance current MoE, examining decentralization and the application of Opportunistic Edge Computing (OEC) for interactions with surrounding IoT devices and IoE entities. Moreover, it outlines the main challenges to guide researchers and businesses towards building a future cyber-resilient opportunistic MoE. © 2024, CC BY.

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