A Low-Cost Open-Source Architecture for a Digital Signage Emergency Evacuation System for Cruise Ships, Based on IoT and LTE/4G Technologies by Vasileios Cheimaras, Athanasios Trigkas, Panagiotis Papageorgas, Dimitrios Piromalis, Emmanouil Sofianopoulos

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Enhancing Smart Agriculture by Implementing Digital Twins: A Comprehensive Review by Nikolaos Peladarinos, Dimitrios Piromalis, Vasileios Cheimaras, Efthymios Tserepas, Radu Adrian Munteanu, Panagiotis Papageorgas

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Emergency Communication System Based on Wireless LPWAN and SD-WAN Technologies: A Hybrid Approach by Vasileios Cheimaras, Nikolaos Peladarinos, Nikolaos Monios, Spyridon Daousis, Spyridon Papagiakoumos, Panagiotis Papageorgas, Dimitrios Piromalis

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Overview of Protocols and Standards for Wireless Sensor Networks in Critical Infrastructures by Spyridon Daousis, Nikolaos Peladarinos, Vasileios Cheimaras, Panagiotis Papageorgas, Dimitrios D. Piromalis, Radu Adrian Munteanu

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Blockchain and Secure Element, a Hybrid Approach for Secure Energy Smart Meter Gateways by Carine Zakaret, Nikolaos Peladarinos, Vasileios Cheimaras, Efthymios Tserepas, Panagiotis Papageorgas, Michel Aillerie, Dimitrios Piromalis, Kyriakos Agavanakis

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Early Warning Systems for COVID-19 Infections Based on Low-Cost Indoor Air-Quality Sensors and LPWANs by Nikolaos Peladarinos, Vasileios Cheimaras, Dimitrios Piromalis, Konstantinos G. Arvanitis, Panagiotis Papageorgas, Nikolaos Monios, Ioannis Dogas, Milos Stojmenovic, Georgios Tsaramirsis

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