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 Mário Amado R Alves

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Average citations per article6.47
Citation Count194
Publication count30
Publication years2001-2011
Available for download6
Average downloads per article292.33
Downloads (cumulative)1,754
Downloads (12 Months)74
Downloads (6 Weeks)6
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1 published by ACM
December 2011 ACM SIGBED Review - Special Issue on the 10th International Workshop on Real-time Networks (RTN 2011): Volume 8 Issue 4, December 2011
Publisher: ACM
Citation Count: 4
Downloads (6 Weeks): 2,   Downloads (12 Months): 36,   Downloads (Overall): 266

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Reliability of communications is key to expand application domains for sensor networks. Since Wireless Sensor Networks (WSN) operate in the license-free Industrial Scientific and Medical (ISM) bands and hence share the spectrum with other wireless technologies, addressing interference is an important challenge. In order to minimize its effect, nodes can ...
Keywords: ISM bands, channel quality, interference, dynamic resource adaptation, wireless sensor networks

2 published by ACM
November 2011 SenSys '11: Proceedings of the 9th ACM Conference on Embedded Networked Sensor Systems
Publisher: ACM
Citation Count: 0
Downloads (6 Weeks): 2,   Downloads (12 Months): 6,   Downloads (Overall): 142

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Wireless sensor networks (WSNs) have attracted growing interest in the last decade as an infrastructure to support a diversity of ubiquitous computing and cyber-physical systems. However, most research work has focused on protocols or on specific applications. As a result, there remains a clear lack of effective and usable WSN ...
Keywords: system design, large scale WSNs, testbed

3 published by ACM
October 2011 MSWiM '11: Proceedings of the 14th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
Publisher: ACM
Citation Count: 1
Downloads (6 Weeks): 1,   Downloads (12 Months): 9,   Downloads (Overall): 107

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Most research work on WSNs has focused on protocols or on specific applications. There is a clear lack of easy/ready-to-use WSN technologies and tools for planning, implementing, testing and commissioning WSN systems in an integrated fashion. While there exists a plethora of papers about network planning and deployment methodologies, to ...
Keywords: testbed, large scale wireless sensor networks, toolset

October 2011 EUC '11: Proceedings of the 2011 IFIP 9th International Conference on Embedded and Ubiquitous Computing
Publisher: IEEE Computer Society
Citation Count: 2

Wireless sensor networks (WSNs) have attracted growing interest in the last decade as an infrastructure to support a diversity of ubiquitous computing and cyber-physical systems. However, most research work has focused on protocols or on specific applications. As a result, there remains a clear lack of effective, feasible and usable ...
Keywords: WSN, large-scale, real-time

September 2011 Ad Hoc Networks: Volume 9 Issue 7, September, 2011
Publisher: Elsevier Science Publishers B. V.
Citation Count: 8

Stringent cost and energy constraints impose the use of low-cost and low-power radio transceivers in large-scale wireless sensor networks (WSNs). This fact, together with the harsh characteristics of the physical environment, requires a rigorous WSN design. Mechanisms for WSN deployment and topology control, MAC and routing, resource and mobility management, ...
Keywords: Performance, Experimentation, Traffic pattern, Channel, Link quality estimation, Measurements, Testbed

January 2011 International Journal of Reconfigurable Computing - Special issue on selected papers from the 17th reconfigurable architectures workshop (RAW2010): Volume 2011, January 2011
Publisher: Hindawi Limited
Citation Count: 0
Downloads (6 Weeks): 0,   Downloads (12 Months): 0,   Downloads (Overall): 9

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Limits of instruction-level parallelism and higher transistor density sustain the increasing need formultiprocessor systems: they are rapidly taking over both general-purpose and embedded processor domains. Current multiprocessing systems are composed either of many homogeneous and simple cores or of complex superscalar, simultaneous multithread processing elements. As parallel applications are becoming ...

December 2010 Microelectronic Engineering: Volume 87 Issue 12, December, 2010
Publisher: Elsevier Science Ltd.
Citation Count: 0

We propose and demonstrate a simple and low cost process for the fabrication of large area arrays of nanometric silicon tips, for use as Field Emission Devices (FEDs). The process combines Interference Lithography (IL) with isotropic Reactive Ion Etching (RIE). Si tips with typical curvature radius of 20nm and height ...
Keywords: Field Emission Devices, Interference Lithography, Reactive Ion Etching (RIE), Silicon tips

8 published by ACM
September 2010 ACM Transactions on Sensor Networks (TOSN): Volume 7 Issue 2, August 2010
Publisher: ACM
Citation Count: 7
Downloads (6 Weeks): 2,   Downloads (12 Months): 17,   Downloads (Overall): 1,055

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Modeling the fundamental performance limits of Wireless Sensor Networks (WSNs) is of paramount importance to understand their behavior under the worst-case conditions and to make the appropriate design choices. This is particular relevant for time-sensitive WSN applications, where the timing behavior of the network protocols (message transmission must respect deadlines) ...
Keywords: Cluster-tree, IEEE 802.15.4, worst-case analysis, ZigBee, network calculus, sensor networks, network dimensioning

September 2010 DSD '10: Proceedings of the 2010 13th Euromicro Conference on Digital System Design: Architectures, Methods and Tools
Publisher: IEEE Computer Society
Citation Count: 2

The IEEE 802.15.4 is the most widespread used protocol for Wireless Sensor Networks (WSNs) and it is being used as a baseline for several higher layer protocols such as ZigBee, 6LoWPAN or Wireless HART. Its MAC (Medium Access Control) supports both contention-free (CFP, based on the reservation of guaranteed time-slots ...

May 2010 AICCSA '10: Proceedings of the ACS/IEEE International Conference on Computer Systems and Applications - AICCSA 2010
Publisher: IEEE Computer Society
Citation Count: 2

Link quality estimation is a fundamental building block for the design of several different mechanisms and protocols in wireless sensor networks. The accuracy of link quality estimation greatly impacts the efficiency of these protocols. Therefore, a thorough experimental evaluation of link quality estimators (LQEs) is mandatory. This motivated us to ...

February 2010 EWSN'10: Proceedings of the 7th European conference on Wireless Sensor Networks
Publisher: Springer-Verlag
Citation Count: 23

Radio Link Quality Estimation (LQE) is a fundamental building block for Wireless Sensor Networks, namely for a reliable deployment, resource management and routing. Existing LQEs (e.g. PRR , ETX , Four-bit , and LQI ) are based on a single link property, thus leading to inaccurate estimation. In this paper, ...

12 published by ACM
March 2009 SAC '09: Proceedings of the 2009 ACM symposium on Applied Computing
Publisher: ACM
Citation Count: 1
Downloads (6 Weeks): 0,   Downloads (12 Months): 1,   Downloads (Overall): 155

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IEEE 802.15.4/ZigBee and TinyOS have been playing an important role in leveraging a new generation of large-scale networked embedded systems. However, based on previous experience on the implementation and use of the IEEE 802.15.4/ZigBee protocols over TinyOS, several problems (producing loss of synchronization and even network failures) emerge due to ...

December 2008 Real-Time Systems: Volume 40 Issue 3, December 2008
Publisher: Kluwer Academic Publishers
Citation Count: 16

Synchronization is a challenging and important issue for time-sensitive Wireless Sensor Networks (WSN) since it requires a mutual spatiotemporal coordination between the nodes. In that concern, the IEEE 802.15.4/ZigBee protocols embody promising technologies for WSNs, but are still ambiguous on how to efficiently build synchronized multiple-cluster networks, specifically for the ...
Keywords: ZigBee, Multi-hop synchronization, Real-time scheduling, Cluster-tree, Collision avoidance, IEEE 802.15.4, Wireless sensor networks

August 2008 RTCSA '08: Proceedings of the 2008 14th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications
Publisher: IEEE Computer Society
Citation Count: 6

Modelling the fundamental performance limits of Wireless Sensor Networks (WSNs) is of paramount importance to understand the behaviour of WSN under worst case conditions and to make the appropriate design choices. In that direction, this paper contributes with a methodology for modelling cluster tree WSNs with a mobile sink. We ...
Keywords: Network Calculus, cluster-tree topology, WSN, worst-case dimensioning, real-time

August 2008 Real-Time Systems: Volume 39 Issue 1-3, August 2008
Publisher: Kluwer Academic Publishers
Citation Count: 9

Timeliness guarantee is an important feature of the recently standardized IEEE 802.15.4 protocol, turning it quite appealing for Wireless Sensor Network (WSN) applications under timing constraints. When operating in beacon-enabled mode, this protocol allows nodes with real-time requirements to allocate Guaranteed Time Slots (GTS) in the contention-free period. The protocol ...
Keywords: Guaranteed time slots, Network calculus, IEEE 802.15.4, Performance evaluation, Real-time, Wireless sensor networks

April 2008 Journal of Computational Physics: Volume 227 Issue 8, April, 2008
Publisher: Academic Press Professional, Inc.
Citation Count: 1

This work presents a numerical technique for simulating incompressible, isothermal, viscoelastic flows of fluids governed by the upper-convected Maxwell (UCM) and K-BKZ (Kaye-Bernstein, Kearsley and Zapas) integral models. The numerical technique described herein is an extension of the GENSMAC method to the solution of the momentum and mass conservation equations ...
Keywords: Finite difference, Integral constitutive equation, Viscoelastic flow, Deformation fields method, K-BKZ model, Upper-convected Maxwell model

October 2007 MASCOTS '07: Proceedings of the 2007 15th International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems
Publisher: IEEE Computer Society
Citation Count: 13

The IEEE 802.15.4 protocol has the ability to support time-sensitive Wireless Sensor Network (WSN) applications due to the Guaranteed Time Slot (GTS) Medium Access Control mechanism. Recently, several analytical and simulation models of the IEEE 802.15.4 protocol have been proposed. Nevertheless, currently available simulation models for this protocol are both ...

August 2007 Computer Networks: The International Journal of Computer and Telecommunications Networking: Volume 51 Issue 11, August, 2007
Publisher: Elsevier North-Holland, Inc.
Citation Count: 0

PROFIBUS is an international standard (IEC 61158, EN 50170) for factory-floor communications, with several thousands of installations worldwide. Taking into account the increasing need for mobile devices in industrial environments, one obvious solution is to extend traditional wired PROFIBUS networks with wireless capabilities. In this paper, we outline the major ...
Keywords: Inter-cell mobility, PROFIBUS, Real-time communications, Wireless communications

July 2007 ECRTS '07: Proceedings of the 19th Euromicro Conference on Real-Time Systems
Publisher: IEEE Computer Society
Citation Count: 20

While the IEEE 802.15.4/Zigbee protocol stack is being considered as a promising technology for low-cost low-power Wireless Sensor Networks (WSNs), several issues in their specifications are still open. One of those ambiguous issues is how to build a synchronized cluster-tree network, which is quite suitable for ensuring QoS support in ...

July 2007 International Journal of Communication Systems - Energy-Efficicent Network Protocols and Algorithms for Wireless Sensor Networks: Volume 20 Issue 7, July 2007
Publisher: John Wiley and Sons Ltd.
Citation Count: 7

The IEEE 802.15.4 protocol proposes a flexible communication solution for low-rate wireless personal area networks (LR-WPAN) including wireless sensor networks (WSNs). It presents the advantage to fit different requirements of potential applications by adequately setting its parameters. When in beacon-enabled mode, the protocol can provide timeliness guarantees by using its ...
Keywords: IEEE 802.15.4, guaranteed time slots, power efficiency, real-time

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