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Bruno F. Marques was born in 1971. At the Faculty of Engineering of University of Porto he received is M.Sc (2001) in Electrical and Computer Engineering. He is presently studying for a Ph.D degree, and he is assistant professor at School of Technology of Viseu, Portugal. He actively participated in the organization of several conferences and workshops, and he also involved in program committees of international conferences (e.g. 3rd, 4th, 5th, and 6th Advanced International Conference on Telecommunications (AICT)).

Tópicos
de interesse
Detalhes

Detalhes

Publicações

2019

Comparing Spatial and Mobile Augmented Reality for Guiding Assembling Procedures with Task Validation

Autores
Alves, J; Marques, B; Oliveira, M; Araújo, T; Dias, P; Santos, BS;

Publicação
19th IEEE International Conference on Autonomous Robot Systems and Competitions, ICARSC 2019

Abstract
Assembly tasks are a common situation in many industrial applications. These tasks are often presented on paper or digital manuals containing instructions, photos or diagrams to guide an assembly sequence. While some Augmented Reality (AR) systems have also been proposed to support these processes, only a few track the state of the assembling procedure, validating the process in real-time. In this work, we propose two different AR-based (mobile and spatial AR) methods with real-time validation to provide assistance to users during the execution of an assembly process. The validation process uses computer vision techniques to keep track of the state of the assembly sequence, verifying the completion of each stage and providing information at the end of the assembly. A controlled experiment was used to compare the performance, ease of use, and acceptance of the two AR-based methods proposed. Participants were significantly faster and made fewer errors using the Spatial AR condition. Besides, participants also preferred this condition. In addition, Nasa TLX rating showed that the Spatial AR condition had a slightly lower cognitive load on the participants. © 2019 IEEE.

2017

Synchronization of application-driven WSN

Autores
Marques, B; Ricardo, M;

Publicação
EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING

Abstract
The growth of wireless sensor networks (WSN) has resulted in part from requirements for connecting sensors and advances in radio technologies. WSN nodes may be required to save energy and therefore wake up and sleep in a synchronized way. In this paper, we propose an application-driven WSN node synchronization mechanism which, by making use of cross-layer information such as application ID and duty cycle, and by using the exponentially weighted moving average (EWMA) technique, enables nodes to wake up and sleep without losing synchronization. The results obtained confirm that this mechanism maintains the nodes in a mesh network synchronized according to the applications they run, while maintaining a high packet reception ratio.

2017

Energy-efficient node selection in application-driven WSN

Autores
Marques, B; Ricardo, M;

Publicação
WIRELESS NETWORKS

Abstract
The growth of wireless networks has resulted in part from requirements for connecting people and advances in radio technologies. Wireless sensor networks are an example of these networks in which a large number of tiny devices interacting with their environments may be internet-worked together and accessible through the Internet. As these devices may be scattered in an unplanned way, a routing protocol is needed. The RPL protocol is the IETF proposed standard protocol for IPv6-based multi-hop WSN. RPL requires that communication paths go through a central router which may provide suboptimal paths, not considering the characteristics of the applications the nodes run. In this paper is proposed an Application-Driven extension to RPL which enables to increase the WSN lifetime by limiting the routing and forwarding functions of the network mainly to nodes running the same application. As nodes may join a network at a non predictable time, they must be synchronized with respect to their application duty cycles. Therefore, nodes have to wake up and sleep in a synchronized way. In this paper it is also proposed such synchronization mechanism. The results confirm that the proposed solutions provide lower energy consumption and lower number of packets exchanged than the conventional RPL solution, while maintaining fairness and the packet reception ratio high.

2014

Improving the Energy Efficiency of WSN by Using Application-Layer Topologies to Constrain RPL-defined Routing Trees

Autores
Marques, BF; Ricardo, MP;

Publicação
2014 13TH ANNUAL MEDITERRANEAN AD HOC NETWORKING WORKSHOP (MED-HOC-NET)

Abstract
The deployment of thousands of tiny devices inter-networked together and accessible through the Internet is the result of the increasing trend towards enabling the concepts of Internet-of-Things. As these devices may be scattered in a unplanned way, a routing protocol is needed. The RPL protocol is the IETF proposed standard protocol for IPv6-based multi-hop Wireless Sensor Networks (WSN). RPL requires that communication paths go through a central router which may provide suboptimal paths, making no distinction of the applications the nodes run. To address these issues, an Application-Driven extension to RPL is proposed which enables the increase of the WSN lifetime by limiting the routing and forwarding functions of the network mainly to nodes running the same application. This paper evaluates the proposed solution coded in ContikiOS by means of Cooja simulations, and compares it against regular RPL. Simulation results confirm that the proposed solution provides lower energy consumption, lower end-to-end delays, and lower total number of packets transmitted and received.

2011

Application-Driven design to extend WSN lifetime

Autores
Bruno Filipe Marques; Manuel Ricardo

Publicação
CNRS 2011 - The 1st Portuguese Conference on Wireless Sensor Networks, Coimbra, Portugal

Abstract