82 documents found, page 1 of 9
Towards a holistic semantic support for context-aware network monitoring: An on...
Carvalho, Paulo; Lima, Solange; Sabucedo, Luis Alvarez; Santos-Gago, Juan M.; Silva, João Marco CardosoMonitoring current communication networks and services is an increasingly complex task as a result of a growth in the number and variety of components involved. Moreover, different perspectives on network monitoring and optimisation policies must be considered to meet context-dependent monitoring requirements. To face these demanding expectations, this article proposes a semantic-based approach to support the f...
Online monitoring of eduroam network: a case study
Silva, Mário; Lima, Solange; Carvalho, Paulo; Antunes, Bruno Alexandre Taraio SantosMonitoring a wireless network is crucial to detect situations that may cause service malfunction, such as other networks in the same wireless space (e.g., ad-hoc, unauthorised, etc.) and malicious behaviour. To control the use of eduroam network in the Departamento de Informatica of the Universidade do Minho, and to allow planning future updates of the infrastructure, traffic was collected and processed from 33...
e-LiteSense: Self-adaptive energy-aware data sensing in WSN environments
Silva, João Marco Cardoso; Carvalho, Paulo; Bispo, Kalil Araujo; Lima, SolangeCurrently deployed in a wide variety of applicational scenarios, wireless sensor networks (WSNs) are typically a resource-constrained infrastructure. Consequently, characteristics such as WSN adaptability, low-overhead, and low-energy consumption are particularly relevant in dynamic and autonomous sensing environments where the measuring requirements change and human intervention is not viable. To tackle this i...
Caracterização de tráfego em dispositivos móveis: web e aplicacional
Areal, Nuno; Carvalho, Paulo; Lima, SolangeThe data plans offered by mobile network operators to users are limited, with costs increasing proportionally to post-limit usage. Thus, users of mobile devices need to manage data plan consumption on a regular basis. In this paper, a comparative study of web and applicational platforms on mobile devices is performed in order to assess which one leads to low data consumption. The methodology used is based on th...
Characterisation of unsolicited traffic advertisements in mobile devices
Silva, José Pedro Veiga; Carvalho, Paulo; Lima, SolangeSmartphones play an undeniable and increasingly important role in people's life, whether to communicate or perform tasks requiring more computing capacity. This growth is also associated with an increase in network traffic due to the widespread use of mobile applications. To have global Internet access, users need to contract a mobile data plan to complement Wi-Fi connectivity, normally, limited to a certain tr...
Detection of anonymised traffic: Tor as case study
Dantas, Bruno; Carvalho, Paulo; Lima, Solange; Silva, João Marco CardosoThis work studies Tor, an anonymous overlay network used to browse the Internet. Apart from its main purpose, this open-source project has gained popularity mainly because it does not hide its implementation. In this way, researchers and security experts can fully examine and confirm its security requirements. Its ease of use has attracted all kinds of people, including ordinary citizens who want to avoid being...
A flexible system for optimising green spaces irrigation
Silva, Sofia; Cardoso, Telmo; Barros, Paulo; Ribeiro, Henrique; Carvalho, Paulo; Lima, SolangeNowadays, the optimisation of irrigation systems and better management of green spaces is essential, particularly, in urban contexts. Water, a vital resource, is often wasted unnecessarily and the soil ends up not containing enough nutrients, which may lead to the death of vegetation. This article tackles this problem at two complementary levels, by (i) developing a web application to manage and control green s...
Monitorização adaptativa da qualidade de águas fluviais usando RSSFs
Araujo, Diogo; Fernandes, Luisa; Silva, Maria; Lima, Solange; Carvalho, PauloIn the context of smart cities, the control of environmental quality plays an increasingly important role attending to the growth in the population and consumption indices. As river waters are a fundamental resource for the population (consumption and leisure), this paper aims to explore a system for analyzing and monitoring river water quality in real-time. To this end, the use of an adaptive Wireless Sensor N...
Sistema de recomendação de rotas pedestres em cidades inteligentes
Fernandes, Stephane; Carvalho, Paulo; Lima, SolangeIn this article a pedestrian route recommendation system is presented and discussed, considering specific objective functions, such as the definition of a course of sport activity, according to the preferences of the users. To support the study, a prototype of the recommendation system was developed and tested using the CupCarbon simulation platform. As a case study, it was considered an urban zone where a wire...
An ontology-based recommendation system for context-aware network monitoring
Silva, Ricardo F.; Carvalho, Paulo; Lima, Solange; Álvarez Sabucedo, Luis; Santos Gago, Juan M.; Silva, João Marco CardosoCurrent network management systems urge for a context-aware perspective of the provided network services and the underlying infrastructure usage. This need results from the heterogeneity of services and technologies in place, and from the massive traffic volumes traversing today’s networks. To reduce complexity and improve interoperability, monitoring systems need to be flexible, context-aware, and able to self...