Prospecção geofísica por georadar em Conimbriga

Apresentam-se os resultados de prospecção geofísica por georadar na zona da chamada Casa de Andercus, em Conimbriga.info:eu-repo/semantics/draf

Integration of the Captive Portal paradigm with the 802.1X architecture

In a scenario where hotspot wireless networks are increasingly being used, and given the amount of sensitive information exchanged on Internet interactions, there is the need to implement security mechanisms that guarantee data confidentiality and integrity in such networks, as well as the authenticity of the hotspot providers. However, many hotspots today use Captive Portals, which rely on authentication through Web pages (thus, an application-level authentication approach) instead of a link-layer approach. The consequence of this is that there is no security in the wireless link to the hotspot (it has to be provided at upper protocol layers), and is cumbersome to manage wireless access profiles (we need special applications or browsers' add-ons to do that). This work exposes the weaknesses of the Captive Portals' paradigm, which does not follow a unique nor standard approach, and describes a solution that intends to suppress them, based on the 802.1X architecture. This solution uses a new EAP-compliant protocol that is able to integrate an HTTP-based registration or authentication with a Captive Portal within the 802.1X authentication framework

Sistema de apoio a organização e gestão de conferências cientificas (CoW – Conference on the Web)

Este artigo pretende divulgar o software de organização e gestão de conferências científicas Conference on the Web (CoW). Software este desenvolvido por alunos finalistas de Eng. Computadores e Telemática na cadeira de opção de 5º ano, de Ferramentas e Aplicacionais Multimédia.This article intends to divulge software developed to help in the organization and management of Scientific Conferences on the Web (CoW). This Software package was developed by last year students of Eng. Computadores and Telemática in 5º year optional subject Ferramentas and Aplicacionais Multimédia

Aplicação da técnica Georadar à reabilitação de património edificado

Mestrado em Engenharia GeológicaA reabilitação tem vindo a ganhar importância na construção civil em Portugal. Esta reabilitação, particularmente no caso do património edificado, deve ser feita por forma a garantir a preservação das características do imóvel, preservando assim a identidade da arquitetura das nossas cidades. Para que a reabilitação de um edifício seja adequadamente efectuada é necessário que o seu estudo seja adequado, nomeadamente no que diz respeito à caracterização dos materiais de construção, alterações ao edifício, estado das fundações, patologias e características do terreno no qual ele assenta. Este estudo irá contribuir para que a reabilitação do edifício seja feita de forma a manter os seus traçados originais e, ao mesmo tempo, proporcionando uma recuperação economicamente viável. Para esse efeito é necessário recorrer à utilização de técnicas não destrutivas, nas quais o Georadar se apresenta com uma relevância particular dada a sua facilidade de aplicação e fiabilidade de resultados. Neste trabalho foi aplicada a técnica do Georadar num edifício do início do século XX situado em Ílhavo. Este edifício é um excelente exemplo da Art Déco tardia em Portugal e tem sido usado pela Associação InovaDomus como um laboratório para experimentação de novas técnicas aplicadas à reabilitação do edificado. Os resultados da prospecção Geofísica efectuada neste edifício permitiram identificar infraestruturas (tubagens e cablagens eléctricas), paredes removidas, elementos construtivos, diferentes tipos de alvenaria nas paredes, manchas de alteação no interior das paredes e uma caracterização geológica do local. Assim foi possível concluir que a técnica do Georadar é uma maisvalia na caracterização do edificado, tanto devido à sua flexibilidade de aplicação, como à economia de recursos que poderá ser alcançada.Rehabilitation has been gaining importance in the construction industry in Portugal. This rehabilitation, particularly in the case of the built heritage, should be made to ensure the preservation of its characteristics, thereby preserving the architectural identity of our cities. For the rehabilitation of a building, it is required that this building is adequately studied, in particular the characteristics of building materials, changes to the original design, foundations state, pathologies and characteristics of the ground on which it rests. This study will ensure that the restoration of the building is taken maintaining the original features and, at the same time providing an economically feasible recovery. For this it is necessary to resort to nondestructive techniques in which the Georadar presents itself with particular relevance given its ease of implementation and reliability of results. In this work, the Georadar was applied to a building of the beginning of XX century located in Ílhavo. This building is an excellent example of the late Art Déco in Portugal and has been used by the InovaDomus Association as a laboratory for the experimentation of new techniques applied to urban rehabilitation. With the results of this Geophysical campaign it was possible to identify infrastructures (pipes and electrical wiring), removed walls, building elements, different types of masonry in the walls, stains inside the walls and a geological characterization of the site. Thus it was concluded that the Georadar is an asset in building characterization, due to its flexibility of application and by the resource savings that can be achieved

Experimentation made easy with the AMazING panel

Experimental testbeds for evaluating solutions in computer networks, are today required as a complement to simulation and emulation. As these testbeds become larger, and accessible to a broader universe of the research community, dedicated management tools become mandatory. These tools ease the complex management of the testbed specific resources, while providing an environment for researchers to define their experiments with large flexibility. While there are currently several management tools, the research community is still lacking tools that smooth the experimentation workflow. These were key aspects that we considered when developing the management infrastructure for our wireless testbed[4] (AMazING). We developed a experimentation support framework supported by an attractive GUI, automation and scripting capabilities, as well as experiment versioning and integrated result gathering and analysis

Caracterização multidisciplinar de eflorescências salinas no Mosteiro da Batalha

O Mosteiro da Batalha é uma relevante obra da arquitectura gótica, resultou do cumprimento da promessa feita por D. João I, após vitória na batalha de Aljubarrota. O mosteiro esteve na posse dos dominicanos até à extinção das ordens religiosas, sendo actualmente dependência da DGPC e Património da Humanidade pela UNESCO. Recentemente a Universidade Aveiro caracterizou estrutural do monumento. Entre as técnicas testadas considera-se aqui o potencial espontâneo, anteriormente aplicados na Igreja da Graça em Santarém (Martinho et. al, 2014). Seleccionou-se uma parede com eflorescências na qual se sobrepôs uma grelha de eléctrodos (12×5) espaçados de 0.5m. O mapeamento do potencial espontâneo foi realizado tendo como referência um eléctrodo sobre eflorescências. Concluiu-se que as zonas da parede com sais estão ao mesmo potencial, enquanto as zonas onde as eflorescências não ocorrem apresentam um potencial mais elevado. A composição mineralógica dos sais foi estudada por Difracção de Raios X

Very large scale high performance computing and instrument management for high availability systems through the use of virtualization at the Square Kilometre Array (SKA) telescope

The Square Kilometer Array (SKA) Telescope, is an ongoing project set to start its building phase in 2018 and be ready for first light in 2020. The first part of the project, the SKA1 will be comprised of 130.000 low frequency antennas (50 MHz to 350 MHz) and 200 mid frequency antennas (350 MHz to 15.5 GHz). The SKA1 will produce a raw data rate of ~10 Tb/s, require a computing power of 100 Pflop/s and an archiving capacity of hundreds of PB/year. The next phase of the project, the SKA2, is going to increase the number of both low and mid antennas by a factor of 10 and increase the computing requirements accordingly. The key requirements for the project are a very demanding availability of 99.9%, computing scalability and result reproducibility. We propose an approach to enforce these requirements - with an optimal use of resources - by using highly distributed computing and virtualization technologies.publishe

Smartlighting: a platform for intelligent building management

This work proposes a solution to endow buildings with efficiency and intelligence, exploiting the advantages of Complex Event Processing techniques and Internet of Things (IoT) principles. This combination allows efficient management of the entire infrastructure, an in particular enabling lighting to be tailored to the users needs. We validate this solution through a prototype implementation, based on wireless sensors and actuator networks that interact with the environment, using standard lightweight protocols designed for IoT. The prototype is based on high performance and real time platforms, and complex methods for analysis of large streams of data. The implementation is applied to a real world scenario, and will be used as the standard solution for management and automation of an existing building

A case study of the use of GPR for rehabilitation of a classified Art Deco building: The InovaDomus house

Ancient buildings in historical town centers can be protected by Cultural Heritage legislation, thus implying thatany rehabilitation must respect their main architectural features. These concerns also apply to Modern and Contemporary buildings, in particular if they are important examples of architectural styles from those periods.These extra problems, or motivations, add to the inherent structural delicacy of ancient building restoration thatrequires detailed knowledge of the building foundations, characteristics and materials, modification history, infrastructure mapping, current pathologies, etc., all relevant information for an informed rehabilitation project.Such knowledge is seldom available before the actual rehabilitation works begin, and the usual invasive preliminary surveys are frequently expensive, time-consuming and likely significantly alter/damage the building's mainfeatures or structural integrity. Hence, the current demand for indirect, non-invasive, reliable and high resolutionimagery techniques able to produce relevant information at the early stages of a rehabilitation project.The present work demonstrates that Ground Penetrating Radar (GPR or Georadar) surveys can provide a prioriknowledge on the structure, construction techniques, materials, history and pathologies in a classified ModernAge building. It is also shown that the use of GPR on these projects requires carefully designed surveys, takinginto account the known information, spatial constraints, environmental noise, nature and dimensions of the expected targets and suitable data processing sequences.Thus, if properly applied, GPR produces high-resolution results crucial for sound engineering/architectural interventions aiming to restore and renovate Modern and Contemporary buildings, with (1) focus on the overall quality of the end-result, (2) no damage inflicted to the existing structure, (3) respect of the building's historicalcoherence and architectural elements and characteristics, that is, its Cultural Heritage value.Most of the findings and applications discussed in this work can be seen as an approximation to model studies, sothat, relevant information can be drawn from the different investigated situations. Therefore, owing to the natureand the range of the problems encountered in this case study, it is also expected that the presented GPR data andinterpretation will provide important clues and guidance in the planning and investigation of similar projects andproblems

SKA telescope manager: a status update

The international Square Kilometre Array (SKA) project to build two radio interferometers is approaching the end of its design phase, and gearing up for the beginning of formal construction. A key part of this distributed Observatory is the overall software control system: the Telescope Manager (TM). The two telescopes, a Low frequency dipole array to be located in Western Australia (SKA-Low) and a Mid-frequency dish array to be located in South Africa (SKA-Mid) will be operated as a single Observatory, with its global headquarters (GHQ) based in the United Kingdom at Jodrell Bank. When complete it will be the most powerful radio observatory in the world. The TM software must combine the observatory operations based at the GHQ with the monitor and control operations of each telescope, covering the range of domains from proposal submission to the coordination and monitoring of the subsystems that make up each telescope. It must also monitor itself and provide a reliable operating platform. This paper will provide an update on the design status of TM, covering the make-up of the consortium delivering the design, a brief description of the key challenges and the top level architecture, and its software development plans for tackling the construction phase of the project. It will also briefly describe the consortium’s response to the SKA Project’s decision in the second half of 2016 to adopt the processes set out by the Software Engineering Institute (SEI) for system architecture design and documentation, including a re-evaluation of its deliverables, documentation and approach to internal reviews.publishe