A5021326108- UAV Applications and Optimization
- Opportunistic and Delay-Tolerant Networks
- Mobile Ad Hoc Networks
- Underwater Vehicles and Communication Systems
- Indoor and Outdoor Localization Technologies
- Distributed Control Multi-Agent Systems
- Energy Efficient Wireless Sensor Networks
- Video Coding and Compression Technologies
- Image and Video Quality Assessment
- Advanced Vision and Imaging
- Bluetooth and Wireless Communication Technologies
- Radio Wave Propagation Studies
- Robotics and Sensor-Based Localization
- Advanced Neural Network Applications
- Vehicular Ad Hoc Networks (VANETs)
- Radiation Detection and Scintillator Technologies
- BIM and Construction Integration
- Context-Aware Activity Recognition Systems
- 3D Surveying and Cultural Heritage
- 3D Modeling in Geospatial Applications
- Underwater Acoustics Research
- IoT Networks and Protocols
- Categorization, perception, and language
- Visual perception and processing mechanisms
- Multimedia Communication and Technology
University of Lisbon
2020-2022
Universidade do Estado do Pará
2022
Universidade do Porto
2016-2021
Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento
2020-2021
Instituto Superior Técnico
2020
Instituto Politécnico de Lisboa
2020
Centre for Health Technology and Services Research
2018
Instituto de Telecomunicações
2013-2017
Carnegie Mellon University
2016-2017
Instituto Politécnico de Leiria
2011-2013
Human populations and natural ecosystems are bound to be exposed ionizing radiation from the deposition of artificial radionuclides resulting nuclear accidents, devices or radiological dispersive (“dirty bombs”). On other hand, Naturally Occurring Radioactive Material industries such as phosphate production uranium mining, contribute on site storage residuals with enhanced concentrations radionuclides. Therefore, in context European agreements concerning energy, namely Atomic Energy...
Unmanned aerial vehicles (UAVs) recently enabled a myriad of new applications spanning domains from personal entertainment to surveillance and monitoring. In this paper, we focus on using several small UAVs collaboratively provide extended reach an online video monitoring system for inspection industrial installations. We make use 802.11 radios low-cost commercial-off-the-shelf UAVs, set up time-division multiple access overlay protocol avoid mutual interference, enable high channel...
Radiological monitoring is fundamental for compliance with radiological protection policies in the aftermath of events, such as nuclear accidents, terrorism, and out-of-commission uranium mines. An effective strategy radiation to use detectors coupled Unmanned Aerial Vehicles (UAVs), enabling quicker surveillance large areas without involving need human presence target area. The main aim this study was formulate parameters a UAV flight preparation future field measurements using...
In the design of shore-to-shore and shore-to-vessel wireless links, impact ray reflected on surface is often neglected. It adds that, in some coastal areas, geometry reflection changes over time due to tides. When choosing an antenna height for inshore node, largest possible used, but this approach can lead signal degradation. The two-ray model most fundamental path loss account contribution ray. We carried out experimental measurements at shores a freshwater body verify that predict major...
This paper investigates the subjective impact resulting from different concealment methods for coping with lost frames in 3D video communication systems. It is assumed that a high priority channel assigned to main view and only auxiliary subject either transmission errors or packet loss, leading missing at decoder output. Three are used frame under loss ratios. The results show depth well perceived by users of not depends on method but also exhibits correlation disparity original sequence....
This paper proposes an extension of the concept asymmetric coding by introducing region-based asymmetry in spatial dimension stereoscopic video. The method relies on stereo image regions with different relevance for 3D perception defined binary masks. It is demonstrated that to a certain extent, lower perceptual can be encoded quality than remaining ones without harming perceived quality. video streams combinations were produced and then evaluated through subjective testing. results show it...
Unmanned Aerial Vehicles (UAVs) are rapidly becoming an important tool for applications like surveillance, target tracking and facility monitoring. In many of these contexts, one or more UAVs need to reach area interest (AOI) while streaming live video a ground station (GS) where operators inspect the AOI carry out fine control position. remote areas, intermediate can act as relays form line network extend range. Interactive requires stream both throughput delay important. this paper, we...
This paper presents an experimental study on subjective quality of 3D video under packet loss conditions. A priority network is assumed, such that the base view a stereoscopic stream delivered through guaranteed channel and auxiliary subject to losses over low channel. Due packetisation scheme, one frame lost whenever lost. Three concealment methods are proposed deal with seven different 3DTV sequences used. The evaluation was carried out for ratios methods, using shutter glasses...
Recent advances in Unmanned Aerial Vehicles (UAVs) have enabled countless new applications the domain of aerial sensing. In scenarios such as intrusion detection, target tracking and facility monitoring it is important to reach a given area interest (AOI), create an online data streaming connection ground station (GS) for immediate delivery content operator. previous work, we showed that multi-hop line network can increase range mission by finding optimal number relay UAVs, their placement....
Sensor technologies will play a key role in the success of Remote Maintenance (RM) systems for future fusion reactors. In this paper, three types sensor particular interest robotics field at moment are evaluated, namely: Colour-Depth cameras, LIDAR (Light Detection And Ranging), and Millimetre-Wave (mmWave) RADAR. The evaluation sensors is performed based on following criteria: data they provide, accuracy different distances, potential environmental resistance (namely gamma radiation)....
Low-power wide-area networks (LPWANs) are extending beyond the conventional terrestrial domain. Coastal zones, rivers, and wetlands, among others, nowadays common deployment settings for Internet-of-Things nodes where communication technologies such as Long Range (LoRa) becoming popular. In this article, we investigate large-scale fading dynamics of LoRa line-of-sight (LoS) links deployed over an estuary with characteristic intertidal considering both shore-to-shore (S2S) shore-to-vessel...
Unmanned Aerial Vehicles (UAVs) can be a powerful tool for live (interactive) remote inspection of large-scale structures or areas interest. Instead manual, local, and labor-intensive inspections, we envision human operators working together with networks semi-autonomous UAVs. The current state-of-the-art low-delay high-throughput inter-vehicle networking relies on Time-Division Multiple Access (TDMA) techniques that require accurate synchronization among all network nodes. In this paper,...
Studies of reaction times for color discrimination have found faster responses to differences between (e.g. blue vs. green) compared within two shades blue) categories Gilbert et al. PNAS 2006). The between-category advantage is more prominent in the right visual field and abolished by verbal interference, consistent with an effect language on perceptual response color. We asked whether linguistic category might be manifest early, encoding color, measuring influence grouping, a task which...
Recent advances in Unmanned Aerial Vehicles (UAVs) have enabled a myriad of new applications many different domains from personal entertainment to process and infrastructure online monitoring large industrial sites, among other. Our work focuses on how one can use several small UAVs collaboratively provide extended reach an video system. We demonstrate TDMA overlay using 802.11 radios low-cost commercial-off-the-shelf (COTS) be used enable high channel utilization multi-hop networks, by...
Vehicular communication is rapidly becoming a standard reality, and precise models are necessary for accurate performance estimates. Alongside cars trucks, smaller vehicles such as scooters bicycles also set to participate in V2X networking, but have received considerably less attention. In this work, we present an extensive characterization of the gain pattern bicycle antenna system IEEE 802.11g standard. We measure radiation patterns commodity 2.4 GHz WiFi module mounted on six distinct...
Modern observation systems can be composed by heterogeneous entities (e.g., buoys, USVs, UAVs, on-shore sensors, etc.) that rely on dependable communications for coordination and data collection, often provided over-water radio-frequency (RF) links. In tide-affected water bodies, RF links at a fixed height from the shore experience so-called tidal fading, cyclic time-varying tide-induced interference. To mitigate it, classical space-diversity reception technique (i.e., use of two or more...
Wireless radio links deployed over aquatic areas (e.g., sea, estuaries or harbors) are affected by the conductive properties of water surface, strengthening signal reflections and increasing interference effects. Recurrent natural phenomena such as tides waves cause shifts in level that, turn, change patterns varying impairments to propagation surfaces. In this work, we aim at mitigating detrimental impact on quality a line-of-sight over-water link between an onshore station surface node,...
Bicycle-to-bicycle (Bi2Bi) communication can be implemented by well-established technologies in the 2.4GHz ISM band: IEEE 802.11, Bluetooth or 802.15.4. These have distinct performance due to different physical and data link layers. In this paper, we characterize mentioned 2.4 GHz-operating over opportunistic links established between bicycles using commodity hardware. We find that, Bi2Bi links, Blue-tooth, 802.11 at 24 Mbit/s, with automatic rate adaptation communicate only immediate...
Human populations and natural ecosystems are bound to be exposed ionizing radiation1from the deposition of artificial radionuclides resulting from nuclear accidents, devices2or radiological dispersive devices ("dirty bombs"). On other hand, NORM industries such as3phosphate production or uranium mining, contribute on site storage residuals with enhanced4concentrations radionuclides. Therefore, in context European agreements5concerning energy, namely EURATOM (European Atomic...