Encontrados 31 documentos, a visualizar página 1 de 4
Improving the communication reliability of body sensor networks based on the IE...
Gomes, Diogo; Afonso, José A.Body sensor networks (BSNs) enable continuous monitoring of patients anywhere, with minimum constraints to daily life activities. Although the IEEE 802.15.4 and ZigBee® (ZigBee Alliance, San Ramon, CA) standards were mainly developed for use in wireless sensors network (WSN) applications, they are also widely used in BSN applications because of device characteristics such as low power, low cost, and small form ...
Scalable semantic aware context storage
Antunes, Mário; Gomes, Diogo; Aguiar, RuiIn recent years the Internet has grown by incorporating billions of small devices, collecting real-world information and distributing it though various systems. As the number of such devices grows, it becomes increasingly difficult to manage all these new information sources. Several context representation schemes have tried to standardize this information, however none of them have been widely adopted. Instead...
Reconfiguração do conhecimento no espaço hipermediático
Gomes, Diogo Miguel Vasconcelos da SilvaDissertação apresentada à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Ciências da Comunicação, ramo de Tecnologias da Comunicação ; Esta dissertação é um dos resultados da participação como bolseiro de investigação no projecto "PO.EX'70-80 – Arquivo Digital da Literatura Experimental Portuguesa" e tem como pano de fundo a problemática dos arquivos digitais para con...
Performance evaluation of ZigBee protocol for high data rate body sensor networks
Gomes, Diogo; Gonçalves, Carlos; Afonso, José A.Publicado em "Proceedings of the World Congress on Engineering 2013", Vol. 2, ISBN 978-988-19252-8-2 ; This paper presents an experimental performance evaluation of ZigBee networks in the context of data-intensive body sensor networks (BSNs). IEEE 802.15.4/ZigBee devices were mainly developed for use in wireless sensors network (WSN) applications; however, due to characteristics such as low power and small for...
How does working capital management affect firms´ profitability? : evidence fro...
Gomes, Diogo Filipe NascimentoMestrado em Finanças ; The purpose of this study is to analyze the relationship between working capital management (WCM) and firm’s profitability for Portugal. We use a database, combining firm-level financial data with a matched employer-employee data, for the period from 2004 to 2009, obtaining a sample of 106,961 observations corresponding to 41,536 firms. Like previous studies, we examine the existence of ...
A Cross-System Approach for Multimedia Services with IP Multicast in 4G Networks
Gomes, Diogo; Aguiar, Rui L.; Sargento, SusanaThe increased demand for multimedia services by mobile end users in recent years have driven both Broadcast and Wireless Network operators to develop new systems and architectures for the deployment of such services. The proposed solutions are nonetheless limited either in terms of QoS or Capabilities to deliver new interactive services. This paper highlights strengths and drawbacks of the existing technologies...
NGM2M
Corujo, Daniel; Gomes, Diogo; Pinto, Filipe Cabral; Santiago, Fernando; Chainho, Paulo; Pássaro, NunoTodos os indicadores apontam para um crescimento exponencial das comunicações máquina-a-máquina. A utilização da informação de uma panóplia de sensores, associada ao uso dos mais diversos atuadores, permite a criação de um mundo novo de aplicações que abrange os mais distintos sectores de atividade. Os ganhos operacionais, a economia de custos e a reinvenção de processos são alguns dos fatores-chave que contrib...
MINDiT: A framework for media independent access to things
Corujo, Daniel; Lebre, Marcelo; Gomes, Diogo; Aguiar, RuiDeploying smart environments often implies a plethora of co-existing devices and services, each with their own set of features, requirements and interfacing characteristics. These intricate scenarios are further exacerbated when such devices are coupled with networking capabilities, globalizing their interaction opportunities to create the so-called Internet of Things. In such interconnected heterogeneous envir...
Architecture for orchestration of M2M services
Pires, Gustavo; Antunes, Mário; Corujo, Daniel; Gomes, Diogo; Barraca, João Paulo; Aguiar, Rui L.The past few years, miniaturization has allowed usto imbue computers into everyday devices. This in turn hasenabled these devices to communicate with each other, and in doing so, allows us to collect a wealth of information, moreaccurately and with greater availability than ever before. Thisphenomenon is known as the Internet of Things. It allows smart environments to truly behave in an intelligent manner by us...
EMICOM: Enhanced Media Independent COnnection Manager
Prata, André; Corujo, Daniel; Gonçalves, Pedro; Gomes, DiogoWith the increasing amount of mobile interfaces combining different kinds of access technologies, ranging from Wi-Fi to 3G and LTE, the integration of flexible and mediaindependent link control mechanisms becomes of paramount importance. By employing an abstract way of obtaining access link status information and exercising control over the network interface operations, these control mechanisms become able to o...
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