Projeto 12-15 : dinâmicas e desafios

Trabalho de projecto de mestrado, Ciências da Educação (Formação de Adultos), Universidade de Lisboa, Instituto de Educação, 2011

The Contemporary Group Program Notes, May 15, 1974

Concert program for The Contemporary Group Program Notes, May 15, 1974

The University Sinfonietta, February 15, 1966

Concert Program for The University Sinfonietta, February 15, 1966

Guitar Ensemble February 15, 2001

Concert Program for Guitar Ensemble February 15 2001

Julietta May 12, 14, 15, 1988

Concert Program for Julietta May 12, 14, 15 1988

Culture and the 2012 games: creating a tourism legacy?

The role of tourism in delivering wider economic legacies is strongly stated in recent national tourism policy documents. The Olympic Games are envisaged to have the legacy impact of ‘4 million extra visitors’ and ‘50,000 extra jobs’ over 4 years (DCMS (2011). Government Tourism Policy, p. 15). This paper considers the nature of Olympic tourism and the possible contribution of the Cultural Olympiad to developing a cultural tourism legacy. It does this by investigating local perceptions of culture and local cultural enactments in the London Borough of Hackney, one of the five boroughs surrounding the Olympic Park. This research shows that local cultural enactments and programming connected to the Olympics are largely motivated by a wider social agenda. They are funded by a wide variety of arts, social and youth programmes and largely reflect initiatives and projects that were already in place in the Borough. While there is an acceptance that cultural events might stimulate the visitor economy, specific discourses around ‘tourism’ and ‘tourists’ are not expressed by the people engaged in the local process.

A NCRF 15 – Investimentos em subsidiárias e consolidação e suas Implicações Fiscais e de Auditoria

Dissertação apresentada ao Instituto Superior de Contabilidade para a obtenção do Grau de Mestre em Auditoria Orientada por Professor Dr. João Domingues da Costa

Unesp Ciência, 2010, ano 2, número 15

Revista elaborada pela Assessoria de Comunicação e Imprensa da Reitoria da UNESP

Estudo exploratório dos comportamentos interativos mãe – filho(a) e pai – filho(a) aos 15 meses de vida.

Dissertação apresentada à Escola Superior de Educação de Lisboa para obtenção do grau de Mestre em Intervenção Precoce

A comparação da qualidade dos momentos de interação em jogo livre entre mãe/ filho - pai /filho e mãe/criança – técnica/criança entre os 13 e 15 meses de idade

Dissertação apresentada para obtenção do grau de Mestre em Ciências da Educação Área de especialização em Intervenção Precoce

Águas minerais em São Miguel (Açores) : perceção pública da sua génese e ocorrência

Dissertação de Mestrado, Geologia do Ambiente e Sociedade, 15 de Fevereiro de 2016, Universidade dos Açores.

An Explicit GTS allocation algorithm for IEEE 802.15.4

The IEEE 802.15.4 standard provides appealing features to simultaneously support real-time and non realtime traffic, but it is only capable of supporting real-time communications from at most seven devices. Additionally, it cannot guarantee delay bounds lower than the superframe duration. Motivated by this problem, in this paper we propose an Explicit Guaranteed time slot Sharing and Allocation scheme (EGSA) for beacon-enabled IEEE 802.15.4 networks. This scheme is capable of providing tighter delay bounds for real-time communications by splitting the Contention Free access Period (CFP) into smaller mini time slots and by means of a new guaranteed bandwidth allocation scheme for a set of devices with periodic messages. At the same the novel bandwidth allocation scheme can maximize the duration of the CFP for non real-time communications. Performance analysis results show that the EGSA scheme works efficiently and outperforms competitor schemes both in terms of guaranteed delay and bandwidth utilization.

Energy efficient scheduling for cluster-tree wireless sensor networks with time-bounded data flows: application to IEEE 802.15.4/ZigBee

Cluster scheduling and collision avoidance are crucial issues in large-scale cluster-tree Wireless Sensor Networks (WSNs). The paper presents a methodology that provides a Time Division Cluster Scheduling (TDCS) mechanism based on the cyclic extension of RCPS/TC (Resource Constrained Project Scheduling with Temporal Constraints) problem for a cluster-tree WSN, assuming bounded communication errors. The objective is to meet all end-to-end deadlines of a predefined set of time-bounded data flows while minimizing the energy consumption of the nodes by setting the TDCS period as long as possible. Sinceeach cluster is active only once during the period, the end-to-end delay of a given flow may span over several periods when there are the flows with opposite direction. The scheduling tool enables system designers to efficiently configure all required parameters of the IEEE 802.15.4/ZigBee beaconenabled cluster-tree WSNs in the network design time. The performance evaluation of thescheduling tool shows that the problems with dozens of nodes can be solved while using optimal solvers.

Simulation study of energy efficient scheduling for IEEE 802.15.4/ZigBee cluster-treeWireless Sensor Networks with time-bounded data flows

The simulation analysis is important approach to developing and evaluating the systems in terms of development time and cost. This paper demonstrates the application of Time Division Cluster Scheduling (TDCS) tool for the configuration of IEEE 802.15.4/ZigBee beaconenabled cluster-tree WSNs using the simulation analysis, as an illustrative example that confirms the practical applicability of the tool. The simulation study analyses how the number of retransmissions impacts the reliability of data transmission, the energy consumption of the nodes and the end-to-end communication delay, based on the simulation model that was implemented in the Opnet Modeler. The configuration parameters of the network are obtained directly from the TDCS tool. The simulation results show that the number of retransmissions impacts the reliability, the energy consumption and the end-to-end delay, in a way that improving the one may degrade the others.

A traffic differentiation add-on to the IEEE 802.15.4 protocol: implementation and experimental validation over a real-time operating system

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 WirelessHART. Its MAC (Medium Access Control) supports both contention-free (CFP, based on the reservation of guaranteed time-slots GTS) and contention based (CAP, ruled by CSMA/CA) access, when operating in beacon-enabled mode. Thus, it enables the differentiation between real-time and best-effort traffic. However, some WSN applications and higher layer protocols may strongly benefit from the possibility of supporting more traffic classes. This happens, for instance, for dense WSNs used in time-sensitive industrial applications. In this context, we propose to differentiate traffic classes within the CAP, enabling lower transmission delays and higher success probability to timecritical messages, such as for event detection, GTS reservation and network management. Building upon a previously proposed methodology (TRADIF), in this paper we outline its implementation and experimental validation over a real-time operating system. Importantly, TRADIF is fully backward compatible with the IEEE 802.15.4 standard, enabling to create different traffic classes just by tuning some MAC parameters.