A5090569371- IoT Networks and Protocols
- Opportunistic and Delay-Tolerant Networks
- Human Mobility and Location-Based Analysis
- Public-Private Partnership Projects
- Public Procurement and Policy
- Local Government Finance and Decentralization
- Complex Network Analysis Techniques
- Energy Harvesting in Wireless Networks
- IoT and Edge/Fog Computing
- Municipal Solid Waste Management
- IoT-based Smart Home Systems
- Green IT and Sustainability
- Urban and Freight Transport Logistics
- Sustainable Supply Chain Management
- Caching and Content Delivery
- Corporate Governance and Law
- Sustainable Development and Environmental Management
- Vehicular Ad Hoc Networks (VANETs)
- Peer-to-Peer Network Technologies
- Bluetooth and Wireless Communication Technologies
- Context-Aware Activity Recognition Systems
- EU Law and Policy Analysis
- Consumer Packaging Perceptions and Trends
- Access Control and Trust
- Regulation and Compliance Studies
University of Lisbon
2010-2025
Instituto Politécnico de Lisboa
2013-2025
Information Technology Laboratory
2023
RNET Technologies (United States)
2021
Institución Universitaria Escuela Nacional del Deporte
2020
This work presents the efforts on optimizing energy consumption by deploying an management system using current IoT component/system/platform integration trends through a layered architecture. LoBEMS (LoRa Building and Energy Management System), proposed platform, was built with mindset of proving common platform that would integrate multiple vendor locked-in systems together custom sensor devices, providing critical data in order to improve overall building efficiency. The actions led...
A LoRaWAN application architecture comprises three functional components: (i) nodes, which convert and wirelessly transmit data as messages; (ii) gateways, receive forward these transmissions; (iii) network servers, process the received for delivery. The nodes into messages them with hope that one or more gateway will successfully. Then, gateways pass on to a distant server, where various processing steps occur before are forwarded end application. If none of can messages, then they be lost....
The city of Lisbon, as any other capital a European country, has large number issues regarding managing waste and recycling containers spread throughout the city. This document presents results study promoted by Lisbon City Council for trialing LPWAN (Low-Power Wide-Area Network) technology management vertical under Smart initiative. Current is done using GSM (Global System Mobile communications) sensors, municipality aims to use in order improve range reduce costs provisioning times when...
The city of Lisbon, has any other capital a European country, large number issues while managing the waste and recycling containers spread throughout city. This document presents results study promoted by Lisbon City Council for trialing LPWAN technology on management vertical under Smart initiative. Current is done using GSM sensors, aim to use reduce costs, improve range provisioning times when changing communications provider. After an initial study, LoRa was selected as choice trials....
The next generation of mobile networks, namely 5G, promises significant qualitative and quantitative advances for multiple vertical domains. However, most studies investigations assess these under the implicit assumption a single network service provider, with typical national coverage. In this article, we take close look at automotive sector highlight series challenges emerging in context its inherent (inter)national mobility corresponding importance cross-border and/or multioperator...
The emergence of smartphones with Wireless LAN (WiFi) network interfaces brought new challenges to application developers. expected increase users connectivity will impact their expectations for example on the performance background applications. Unfortunately, number and breadth studies patterns user mobility that result from is still insufficient support this claim. This paper contributes preliminary results a large scale study usage pattern about 49000 devices 31000 who accessed at least...
In less than a decade, smartphones and mobile applications spread like wildfire dramatically improved aspects of our professional private lives, from efficiency to safety. However, these are still in their infancy mostly provide versions online Internet services or arcade games. With the exception simple location-based query applications, context-awareness is largely ignored. it not hard imagine advanced social networking -- SNAPPs for short that could proactively assist users everyday...
In this research paper we describe the development phase of a low-cost LoRa IoT solution applied to kindergarten school with three years results. A set sensors was developed in communication board, battery powered, providing simplified setup process. These were used order measure temperature, humidity, luminosity, air quality and presence. Also, energy monitor solutions integrated. The acquired data is transmitted analysed for knowledge extraction, identifying savings other related KPIs....
This paper aims to present a new performance measurement tool dedicated mobile cellular networks, focussed on the C-ITS applications and challenges. Called ISEL QoS-Network Performance Evaluation (IQ-NPE), developed under European Union 5G-MOBIX project, it is that able extract wide range of parameters at different levels: radio, network layers application. step further when comparing with classical tools, based terminals, because take advantage modems using Multiple Input Output (MIMO)...
The capability to anticipate a contact with another device can contribute improving the performance and user satisfaction of mobile social network applications any other relying on some form data harvesting or hoarding. This paper presents nine year set wireless access logs produced by more than 70,000 devices 40,000 users. Research recurring patterns observed between groups permitted model probabilities occurrence at predefined date pairs devices. As an example, evaluates algorithm that...
The understanding of human mobility patterns is key for the development and evaluation ubiquitous applications. To overcome scarcity difficulties in capturing data, models have been devised. In general, each model replicates some observed metrics, while neglecting others.
Allowing a mobile device to provide service the neighbouring peers carries non-negligible risks, of which confidentiality, privacy and selfishness are good examples. To discourage selfishness, two approaches typically taken: i) in trade based systems, devices agree on retribution for execution task, ii) trust systems rogue detected announced by their peers. We show that some scenarios found wireless networks both present sub-optimal results. The paper describes evaluates hybrid service,...
The capability to anticipate a contact with another device can greatly improve the performance and user satisfaction not only of mobile social network applications but any other relying on some form data harvesting or hoarding. One most promising approaches for prediction is t
Internet of Things (IoT) devices are ubiquitous in various applications, such as smart homes, asset and people tracking, city management systems. However, their deployment adverse conditions, including unstable internet connectivity power sources, present new cybersecurity challenges through attack vectors. The LoRaWAN protocol, with its open distributed network architecture, has gained prominence a leading LPWAN solution, presenting novel security challenges. This paper proposes the...
The understanding of human mobility patterns is key for the development and evaluation ubiquitous applications. To circumvent scarcity difficulties in capturing data, a number models has been devised. accuracy replicating observed by these vari
Smart cities are, nowadays, an unavoidable and growing reality, supported on software platforms that support city management, through the processing presentation of a large number data, obtained from sensors used throughout cities. Low-power wide area networks (LPWAN) leverage sensorization process; however, urban landscape, in turn, induces high probability change propagation conditions LPWAN network, thus requiring active monitoring solutions for assessing network condition. Currently...
Although the computational power of mobile devices has been increasing, it is still not enough for some classes applications. In present, these applications delegate computing burden on servers located Internet. This model assumes an always-on Internet connectivity and implies a non-negligible latency. The thesis addresses challenges contributions posed to application collaborative environment concept wireless networks. goal define reference architecture high performance Current work focused...
The capability to anticipate a contact with another device can greatly improve the performance and user satisfaction not only of mobile social network applications but of any other relying on some form data harvesting or hoarding. One most promising approaches for prediction is extrapolate from past experiences. This paper investigates recurring patterns observed between groups devices using an 8-year data-set of wireless access logs produced by more than 70000 devices. effort...