6 documents found, page 1 of 1
Securing IoT sensors using sharding-based blockchain network technology integra...
Aslam, Ammad; Postolache, Octavian; Oliveira, Sancho; Dias Pereira, José Miguel CostaSharding is an emerging blockchain technology that is used extensively in several fields such as finance, reputation systems, the IoT, and others because of its ability to secure and increase the number of transactions every second. In sharding-based technology, the blockchain is divided into several sub-chains, also known as shards, that enhance the network throughput. This paper aims to examine the impact of ...
Experimental Characterization of WSNs Applied to Swarms of Aquatic Surface Drones
Velez, Fernando J.; Nadziejko, Aleksandra K. N.; Christensen, Andersen; Oliveira, Sancho; Rodrigues, Tiago; Costa, Vasco; Duarte, MiguelANCAD project aims at developing technologies and communication protocols for swarms of aquatic inexpensive surface drones. The goal is to perform maritime tasks such as sea border patrolling or environmental monitoring, keeping the cost of the drones low. The exchange of information within the swarm is essential for the success of the mission. The most recent solution for control and communications within the ...
Wireless Sensor and Networking Technologies for Swarms of Aquatic Surface Drones
Velez, Fernando J.; Nadziejko, Aleksandra; Christensen, Anders Lyhne; Oliveira, Sancho; Rodrigues, Tiago; Costa, Vasco; Duarte, Miguel; Silva, FernandoIn this paper, we discuss wireless sensor and networking technologies for swarms of inexpensive aquatic surface drones in the context of the HANCAD project. The goal is to enable the swarm to perform maritime tasks such as sea-border patrolling and environmental monitoring, while keeping the cost of each drone low. Communication between drones is essential for the success of the project. Preliminary experiments...
Design of Communication and Control for Swarms of Aquatic Surface Drones
Christensen, Anders Lyhne; Oliveira, Sancho; Postolache, Octavian; Oliveira, Maria João de; Sargento, Susana; Santana, Pedro; Nunes, LuisThe availability of relatively capable and inexpensive hardware components has made it feasible to consider large-scale systems of autonomous aquatic drones for maritime tasks. In this paper, we present the CORATAM and HANCAD projects, which focus on the fundamental challenges related to communication and control in swarms of aquatic drones. We argue for: (i) the adoption of a heterogeneous approach to communic...
Design of Communication and Control for Swarms of Aquatic Surface Drones
Christensen, Anders Lyhne; Oliveira, Sancho; Postolache, Octavian; Oliveira, Maria João de; Sargento, Susana; Santana, Pedro; Nunes, LuísThe availability of relatively capable and inexpensive hardware components has made it feasible to consider large-scale systems of autonomous aquatic drones for maritime tasks. In this paper, we present the CORATAM and HANCAD projects, which focus on the fundamental challenges related to communication and control in swarms of aquatic drones. We argue for (i) the adoption of a heterogeneous approach to communica...
Hierarchical Reinforcement Learning: Learning Sub-goals and State-Abstraction
Jardim, David; Oliveira, Sancho; Nunes, LuísIn this paper we present a method that allows an agent to discover and create temporal abstractions autonomously. Our method is based on the concept that to reach the goal, the agent must pass through relevant states that we will interpret as subgoals. To detect useful subgoals, our method creates intersections between several paths leading to a goal. Our research focused on domains largely used in the study of...