Simulação e síntese de controladores paralelos a partir de especificações baseados em redes de Petri

As Redes de Petri (RdP) mostram-se uma metodologia poderosa na modelação de sistemas de eventos discretos. Tal deve-se, em grande medida, ao conjunto disponível de técnicas formais para análise estrutural e dinâmica dos sistemas modelados. Apresentam-se as vantagens na utilização de RdP, relativamente a outros paradigmas de modelação, na especificação de controladores com comportamento paralelo. São também propostas algumas alterações ao comportamento habitual das RdP, de forma a conseguir modelar eficientemente os controladores. É apresentado um novo ambiente de desenvolvimento que permite especificar, analisar, animar, simular e sintetizar estruturas de controlo digitais, a partir de uma RdP. Finalmente, é considerado e analisado detalhadamente um exemplo.Petri Nets prove to be an efficient methodology for modelling discrete-event systems with parallel activities. This is due to the availability of a set of formal techniques, for validation of the modelled system. The advantages on using Petri Nets in relation to other modelling paradigms are considered. Modifications to the standard PN behaviour are proposed which allow fast specification of synchronous parailel controllers. A new software framework is presented which allows complex parailel controllers, to be specified, analysed, animated, simulated and synthesized for a Petai Net-based controiler. The analysis of a detailed example doses this communication

An OGC/SOS conformant client to manage geospatial data on the GRID

This paper describes a Sensor Observation Service (SOS) client developed to integrate dynamic geospatial data from meteorological sensors, on a grid-based risk management decision support system. The present work is part of the CROSS-Fire project, which uses forest fires as the main case study and the FireStation application to simulate fire spread. The meteorological data is accessed through the SOS standard from Open Geospatial Consortium (OGC), using the Observations and Measurements (O&M) standard encoding format. Since the SOS standard was not designed to directly access sensors, we developed an interface application to load the SOS database with observations from a Vantis Weather Station (WS). To integrate the SOS meteorological data into the FireStation, the developed SOS client was embedded on a Web Processing Service (WPS) algorithm. This algorithm was designed to be functional and fully compliant with SOS, SensorML, and O&M standards from OGC. With minor modifications to the developed SOS database interface, the SOS client works with any WS. This client supports spatial and temporal filters, including the integration of dynamic data from satellites into FireStation, as described.Fundação para a Ciência e a Tecnologia (FCT

A platform to support civil protection applications on the GRID

The CROSS-Fire is a Portuguese NGI funded project focus-ing on the development of a grid-based risk management decision support system for the Civil Protection (CP), using forest fires as the main case study. The project defines a general approach for the development of a CP application by defining an architecture that integrates three main layers: the CROSS-Fire Platform and two external infrastructures: a Spatial Data Infrastructure (SDI) and the GRID. The CROSS-Fire Platform is defined and implemented as a set of WPS algorithms dealing with most of the functionalities of its three components: Business Logic, Grid Services and Geospatial services. The present work stresses the relevance of standards adoption: OGC-WS WCS/WFS/WMS/WPS, to exploit/enable geospatial services for data access processing, and OGC-SWE SOS to address other CP data sources, such as meteorological station networks (MSN) or satellites. The adoption of a Web Services (WS) approach allows integrating easily with existing systems typically based on WS technologies. We also present CFS, a grid user interface SDI based client, compliant with OGC and EU INSPIRE directives which allows decision makers to access the spatial data infrastructure, to launch simulations on the grid and visualize the fire propagation simulations.Fundação para a Ciência e a Tecnologia (FCT

CROSS-Fire : a risk management decision support system on the Grid

The CROSS-Fire project aims to develop a grid-based risk management decision support system for the Civil Protection (CP) authorities, using forest fires as the main case study and FireStation as a standalone CAD application to simulate the fire spread over complex topography. CROSS-Fire approach is based in an architecture that includes: information models, encodings, and metadata that represent the scientific knowledge associated to FireStation execution models and standards to enable the discovery and access of Web services, data repository, sensor networks and data processing facilities. To achieve the desired integration of information and services we use: i) EGEE to provide raw technological capability provision, including data management and storage, access to meta-data data bases and high-performance computing and ii) a Geospatial Information Infrastructure based on OCG-WS and SWE Web services to provide the access and management of remote geospatial data and virtualized sensor networks. This article, stresses the relevance of standards adoption of OGC-WS by describing the work that is been done to provide G-FireStation with: i) a standard-based SDI layer, based on Geoserver to exploit/enable geospatial services for data access/processing and ii) a 52N’s implementation of a OGC-SWE compatible layer, to address sensors CP data sources, such as meteorological stations data and satellite images and iii) the development of G-FireStation graphical user interface to access the platform facilities. The core of the CROSS-Fire Platform is a WPS 52North OGC standard layer divided into three interoperable components, respectively, the CROSS-Fire Business Logic, the Grid Services and Geospatial Services. WPS serves as an interface to a wide range of distributed computing resources provides the mechanism to access the grid facilities for processing and data management and including all the algorithms, calculation, or model that operates on spatially referenced data, also mediating all the communication with the portal and other GUI clients. The G-FireStation user interface that is currently under development is an open-source desktop with GIS and CAD capabilities that exploits an SDI client complying with OGC-WS and EU INSPIRE directives. It provides facilities to locate and access the spatial data infrastructure and to visualize the fire propagation, based on the native facilities of gvSig, it was also extended to support a OGC WPS client that mediate all the interactions with the core WPS service layer.Fundação para a Ciência e a Tecnologia (FCT

Desenvolvimento de um Repositório de Imagens e Base de Dados Portuguesa de Casos COVID-19: Aprendizagem e Partilha de Conhecimento em Tempo de Pandemia

info:eu-repo/semantics/publishedVersio

Cross-Fire : a grid platform to integrate geo-referenced web services for real-time risk management

Fire propagation simulation tools are useful at different levels of forest fire management. From prescribed fire planning to fuel hazard assessment or to the development of fire suppression strategies on wildfires or even training activities. Nevertheless, real time use of such tools is still very limited among the operational authorities for several reasons: lack of good real time data, lack of training or even lack of confidence on the capabilities of actual systems, among others. Wildfire management is a relevant Civil Protection (CP) activity that involves many different and autonomous actors, from public bodies to research centres and should some how reach the general public as an information and alert system. It requires a fast and reliable risk management support system, with real-time or near real-time availability of critical geo-referenced data and settings-based forecasts for fire spreading. CP applications require a strict integration of human and physical resources that must be shared in a coordinated and effective way and be available for the whole emergency procedure. The GRID and Virtual Organizations (VO) enable such integration by providing the coordination and the sharing of the available interconnected resources (computing, storage, communication, sensors and actuators) geographically scattered across national borders. On the another hand, OGC (Open Geospatial Consortium) based geo-web services are being adopted worldwide, as the technology to support the development of complex distributed applications over grid platforms, to deal with data from many different sources, including meteorological stations and satellites. Recent work clearly showed the advantage of the OGC proposals for open standards for geospatial interchange formats, over past legacy formats and applications.Fundação para a Ciência e a Tecnologia (FCT

Bridging the gap between applications geospatial data and the Grid

Fundação para a Ciência e a Tecnologia (FCT

Proliferação Melanocítica Uveal Difusa Bilateral (BDUMP) como forma de apresentação de adenocarcinoma do pulmão

Objectivo: Descrever um caso da rara síndroma de proliferação melanocítica uveal difusa bilateral(BDUMP). Descrição do Caso Clínico: Doente, do sexo masculino, 64 anos, fumador, com história de Perda progressiva e grave da acuidade visual bilateral nos últimos 9 meses. A observação apresentava melhor acuidade visual corrigida (MAVC) de 20/50 no OD e de 20/70 no OE, catarata bilateral e tumor pigmentado da íris no OE. Para além destas alterações apresentava ainda bilateralmente vários tumores coroideus pigmentados e múltiplas pequenas lesões vermelho-acastanhadas ao nível do epitélio pigmentado da retina, com correspondente hiperfluorescência precoce na angiografia fluoresceínica e perda de autofluorescência. Com base nos dados clínicos foi feito o diagnóstico de BDUMP e iniciada uma avaliação sistémica que conduziu ao diagnóstico de adenocarcinoma do pulmão, detectado por TC e confirmado por biópsia. Conclusões: BDUMP é uma síndroma paraneoplásica rara que ocorre em doentes com carcinoma sistémico, muitas vezes oculto. A consideração desta entidade clínica pode conduzir a um diagnóstico mais precoce de uma neoplasia potencialmente com melhoria do prognóstico associado

Internação em unidade de terapia intensiva: percepção de pacientes

Estudo com abordagem qualitativa que objetivou compreender, a partir da perspectiva do paciente adulto, a experiênciade se vivenciar uma internação em Unidade de Terapia Intensiva (UTI), de modo a contribuir para melhoriana qualidade da assistência e facilitar a adaptação em um ambiente tão estigmatizado. Os dados foram coletadosna UTI de um hospital do sudoeste de São Paulo, Brasil. Foram entrevistados dez pacientes, e identificadastemáticas relacionadas à percepção prévia da UTI; diferenciação com a assistência nos setores de internamento;tecnologia e assistência especializada; alterações ambientais e de hábitos em UTI. Inicialmente, os informantesrelacionavam a UTI com a terminalidade e passaram a retratar o setor como local para o tratamento erecuperação, passando a ter uma visão positiva do ambiente de terapia intensiva.