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132 results on '"Zorbas, Dimitrios"'

1. Wireless Communications for Smart Manufacturing and Industrial IoT: Existing Technologies, 5G, and Beyond

Author

Noor-A-Rahim, Md., John, Jobish, Firyaguna, Fadhil, Zorbas, Dimitrios, Sherazi, Hafiz Husnain Raza, Kushch, Sergii, Connell, Eoin O, Pesch, Dirk, Flynn, Brendan O, Hayes, Martin, and Armstrong, Eddie

Subjects
Computer Science - Networking and Internet Architecture
Abstract

Smart manufacturing is a vision and major driver for change in industrial environments. The goal of smart manufacturing is to optimize manufacturing processes through constantly monitoring and adapting processes towards more efficient and personalised manufacturing. This requires and relies on technologies for connected machines incorporating a variety of computation, sensing, actuation, and machine to machine communications modalities. As such, understanding the change towards smart manufacturing requires knowledge of the enabling technologies, their applications in real world scenarios and the communications protocols that they rely on. This paper presents an extensive review of wireless machine to machine communication protocols currently applied in manufacturing environments and provides a comprehensive review of the associated use cases whilst defining their expected impact on the future of smart manufacturing. Based on the review, we point out a number of open challenges and directions for future research., Comment: The manuscript has been submitted to IEEE for possible publication

Published
2022

6. FREE -- Fine-grained Scheduling for Reliable and Energy Efficient Data Collection in LoRaWAN

Author

Abdelfadeel, Khaled Q., Zorbas, Dimitrios, Cionca, Victor, and Pesch, Dirk

Subjects
Computer Science - Networking and Internet Architecture
Abstract

LoRaWAN promises to provide wide-area network access to low-cost devices that can operate for up to 10 years on a single 1000 mAh battery. This makes LoRaWAN particularly suited to data collection applications (e.g. monitoring applications), where device lifetime is a key performance metric. However, when supporting a large number of devices, LoRaWAN suffers from a scalability issue due to the high collision probability of its Aloha-based MAC layer. The performance worsens further when using acknowledged transmissions due to the duty cycle restriction at the gateway. For this, we propose FREE, a fine-grained scheduling scheme for reliable and energy-efficient data collection in LoRaWAN. FREE takes advantage of applications that do not have hard delay requirements on data delivery by supporting synchronized bulk data transmission. This means data is buffered for transmission in scheduled time slots instead of transmitted straight away. FREE allocates spreading factors, transmission powers, frequency channels, time slots, and schedules slots in frames for LoRaWAN end-devices. As a result, FREE overcomes the scalability problem of LoRaWAN by eliminating collisions and grouping acknowledgments. We evaluate the performance of FREE versus different legacy LoRaWAN configurations. The numerical results show that FREE scales well and achieves almost 100% data delivery and the device lifetime is estimated to over 10 years independent of traffic type and network size. Comparing to poor scalability, low data delivery and device lifetime of fewer than 2 years for acknowledged data traffic in the standard LoRaWAN configurations., Comment: 16 pages, 8 figures, 5 tables, and 2 algorithms

Published
2018

9. Modeling the power consumption of a Wifibot and studying the role of communication cost in operation time

Author

Zorbas, Dimitrios and Razafindralambo, Tahiry

Subjects
Computer Science - Robotics
Abstract

Mobile robots are becoming part of our every day living at home, work or entertainment. Due to their limited power capabilities, the development of new energy consumption models can lead to energy conservation and energy efficient designs. In this paper, we carry out a number of experiments and we focus on the motors power consumption of a specific robot called Wifibot. Based on the experimentation results, we build models for different speed and acceleration levels. We compare the motors power consumption to other robot running modes. We, also, create a simple robot network scenario and we investigate whether forwarding data through a closer node could lead to longer operation times. We assess the effect energy capacity, traveling distance and data rate on the operation time.

Published
2015

13. Modeling and Solving the Packet Routing Problem in Industrial IoT Networks

Author

Di Puglia Pugliese, Luigi, Zorbas, Dimitrios, Guerriero, Francesca, Vigo, Daniele, Editor-in-Chief, Agnetis, Alessandro, Series Editor, Amaldi, Edoardo, Series Editor, Guerriero, Francesca, Series Editor, Lucidi, Stefano, Series Editor, Messina, Enza, Series Editor, Sforza, Antonio, Series Editor, Daniele, Patrizia, editor, and Scrimali, Laura, editor

Published
2018
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16. Technological Innovations in Agriculture for Scouting Halyomorpha Halys in Orchards

Author

Almstedt, Lennart, primary, Baltieri, Davide, additional, Sorbelli, Francesco Betti, additional, Cattozzi, Davide, additional, Giannetti, Daniele, additional, Kargar, Amin, additional, Maistrello, Lara, additional, Navarra, Alfredo, additional, Niederprüm, David, additional, O'Flynn, Brendan, additional, Palazzetti, Lorenzo, additional, Patelli, Niccolò, additional, Piccinini, Luca, additional, Pinotti, Cristina M., additional, Wolf, Lars, additional, and Zorbas, Dimitrios, additional

Published
2023
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18. Synchronized ESP-NOW for Improved Energy Efficiency

Author

Magzym, Yermakhan, Eduard, Aida, Urazayev, Dnislam, Fafoutis, Xenofon, Zorbas, Dimitrios, Magzym, Yermakhan, Eduard, Aida, Urazayev, Dnislam, Fafoutis, Xenofon, and Zorbas, Dimitrios

Abstract

ESP-NOW is a peer-to-peer wireless communication protocol developed by Espressif Systems for low-power and low-cost in-situ Internet of Things devices. ESP-NOW supports bidirectional communication between multiple transmitters (masters) and multiple end-devices (slaves). It also supports both unicast and broadcast transmissions. This paper proposes asynchronized method, called Sync-ESP-NOW, to improve the energy efficiency of the end-devices by scheduling broadcast transmissions in predefined time intervals. The proposed method creates a synchronized application layer which allows the end devices to be in on mode only when a master’s transmission is performed, while they remain in sleep mode to conserve energy for the rest of the time. However, due to the periodic wake-up of the end-devices, a compromise in terms of delay exists. We evaluate the proposed approach through a series of experiments and demonstrate significant improvements in terms of energy efficiency at the end-devices without compromising the packet reception ratio. The proposed approach achieves an up to 96% lower energy consumption considering various packet rate scenarios.

Published
2023

20. Connectivity Restoration and Amelioration in Wireless Ad-Hoc Networks: A Practical Solution

Author

Katsikiotis, Christos, Zorbas, Dimitrios, Chatzimisios, Periklis, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Coulson, Geoff, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin (Sherman), Series editor, Stan, Mircea, Series editor, Jia, Xiaohua, Series editor, Zomaya, Albert, Series editor, Mitton, Natalie, editor, Gallais, Antoine, editor, Kantarci, Melike Erol, editor, and Papavassiliou, Symeon, editor

Published
2014
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21. A Low-Overhead Localized Target Coverage Algorithm in Wireless Sensor Networks

Author

Zorbas, Dimitrios, Douligeris, Christos, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Coulson, Geoff, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin (Sherman), Series editor, Stan, Mircea, Series editor, Jia, Xiaohua, Series editor, Zomaya, Albert, Series editor, Mitton, Natalie, editor, Gallais, Antoine, editor, Kantarci, Melike Erol, editor, and Papavassiliou, Symeon, editor

Published
2014
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22. Extending Network Tree Lifetime with Mobile and Rechargeable Nodes

Author

Zorbas, Dimitrios, Razafindralambo, Tahiry, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Kobsa, Alfred, editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Weikum, Gerhard, editor, Guo, Song, editor, Lloret, Jaime, editor, Manzoni, Pietro, editor, and Ruehrup, Stefan, editor

Published
2014
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25. A novel resource-constrained insect monitoring system based on machine vision with edge AI

Author

Kargar, Amin, Wilk, Mariusz P., Zorbas, Dimitrios, Gaffney, Michael T., and O'Flynn, Brendan

Subjects
Image processing, Integrated Pest Management (IPM), Deep learning, Food security, Edge AI, Machine vision, Integrated Pest Monitoring
Abstract

Effective insect pest monitoring is a vital component of Integrated Pest Management (IPM) strategies. It helps to support crop productivity while minimising the need for plant protection products. In recent years, many researchers have considered the integration of intelligence into such systems in the context of the Smart Agriculture research agenda. This paper describes the development of a smart pest monitoring system, developed in accordance with specific requirements associated with the agricultural sector. The proposed system is a low-cost smart insect trap, for use in orchards, that detects specific insect species that are detrimental to fruit quality. The system helps to identify the invasive insect, Brown Marmorated Stink Bug (BMSB) or Halyomorpha halys (HH) using a Microcontroller Unit-based edge device comprising of an Internet of Things enabled, resource-constrained image acquisition and processing system. It is used to execute our proposed lightweight image analysis algorithm and Convolutional Neural Network (CNN) model for insect detection and classification, respectively. The prototype device is currently deployed in an orchard in Italy. The preliminary experimental results show over 70 percent of accuracy in BMSB classification on our custom-built dataset, demonstrating the proposed system feasibility and effectiveness in monitoring this invasive insect species.

Published
2023

26. Node Discovery and Replacement Using Mobile Robot

Author

Magklara, Kalypso, Zorbas, Dimitrios, Razafindralambo, Tahiry, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin (Sherman), Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert, Series editor, Coulson, Geoffrey, Series editor, Zheng, Jun, editor, Mitton, Nathalie, editor, Li, Jun, editor, and Lorenz, Pascal, editor

Published
2013
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34. A Museum Artefact Monitoring Testbed using LoRaWAN

Author

Gawade, Dinesh R., primary, Simorangkir, Roy B. V. B., additional, Zorbas, Dimitrios, additional, Kumar, Sanjeev, additional, Ziemann, Steffen, additional, Iacopino, Daniela, additional, Barton, John, additional, Schuhmann, Katharina, additional, Anders, Manfred, additional, O'Flynn, Brendan, additional, and Buckley, John L., additional

Published
2021
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38. Time-Slotted LoRa Networks: Design Considerations, Implementations, and Perspectives

Author

Zorbas, Dimitrios, Fafoutis, Xenofon, Zorbas, Dimitrios, and Fafoutis, Xenofon

Abstract

In recent years, LoRa and LoRaWAN have emerged as a promising Low-Power Wide Area Networking (LPWAN) technology for long-range low-throughput applications. LoRaWAN, however, is based on unregulated medium access and, thus, cannot provide high packet delivery guarantees. This limitation, indeed, hinders the suitability of LoRaWAN for Industrial Internet of Things applications. In this article, we explore time-slotted medium access protocols as a reliable alternative to LoRaWAN, focusing on the considerations, challenges and perspectives for designing time-slotted protocols that leverage LoRa at the physical layer. The article is particularly focused on protocols with either a proof-of-concept implementation or protocols that have been deployed in the real world.

Published
2021

48. Utiliser des drones pour recharger efficacement des capteurs

Author

Caillouet, Christelle, Razafindralambo, Tahiry, Zorbas, Dimitrios, Combinatorics, Optimization and Algorithms for Telecommunications (COATI), COMmunications, Réseaux, systèmes Embarqués et Distribués (Laboratoire I3S - COMRED), Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria), Laboratoire d'Informatique et de Mathématiques (LIM), Université de La Réunion (UR), Tyndall National Institute [Cork], Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-COMmunications, Réseaux, systèmes Embarqués et Distribués (Laboratoire I3S - COMRED), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (1965 - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)

Subjects
[INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

49. FREE -- Fine-grained Scheduling for Reliable and Energy Efficient Data Collection in LoRaWAN

Author

Abdefadeel, Khaled Q., Zorbas, Dimitrios, Cionca, Victor, and Pesch, Dirk

Subjects
Computer Science - Networking and Internet Architecture, Networking and Internet Architecture (cs.NI), FOS: Computer and information sciences
Abstract

LoRaWAN promises to provide wide-area network access to low-cost devices that can operate for up to 10 years on a single 1000 mAh battery. This makes LoRaWAN particularly suited to data collection applications (e.g. monitoring applications), where device lifetime is a key performance metric. However, when supporting a large number of devices, LoRaWAN suffers from a scalability issue due to the high collision probability of its Aloha-based MAC layer. The performance worsens further when using acknowledged transmissions due to the duty cycle restriction at the gateway. For this, we propose FREE, a fine-grained scheduling scheme for reliable and energy-efficient data collection in LoRaWAN. FREE takes advantage of applications that do not have hard delay requirements on data delivery by supporting synchronized bulk data transmission. This means data is buffered for transmission in scheduled time slots instead of transmitted straight away. FREE allocates spreading factors, transmission powers, frequency channels, time slots, and schedules slots in frames for LoRaWAN end-devices. As a result, FREE overcomes the scalability problem of LoRaWAN by eliminating collisions and grouping acknowledgments. We evaluate the performance of FREE versus different legacy LoRaWAN configurations. The numerical results show that FREE scales well and achieves almost 100% data delivery and the device lifetime is estimated to over 10 years independent of traffic type and network size. Comparing to poor scalability, low data delivery and device lifetime of fewer than 2 years for acknowledged data traffic in the standard LoRaWAN configurations., Comment: 16 pages, 8 figures, 5 tables, and 2 algorithms

Published
2018
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