Institute Desenvolvimento Of Novas Tecnologias

Quinta do Anjo, Portugal

Institute Desenvolvimento Of Novas Tecnologias

Quinta do Anjo, Portugal
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Pereira F.,New University of Lisbon | Pereira F.,Institute Desenvolvimento Of Novas Tecnologias | Gomes L.,Institute Desenvolvimento Of Novas Tecnologias | Gomes L.,New University of Lisbon
IEEE Transactions on Industrial Electronics | Year: 2017

The input-output place-transition (IOPT)-flow modeling framework was created to support the design of mixed embedded system controllers containing both reactive and data-driven parts, combining Petri net and dataflow elements. The reactive parts, whose evolution depends on external events, are modeled using Petri nets. Data manipulation operations that process input signals and events are expressed using dataflows. The framework is composed by a Web-based tool-chain including a graphical editor, a simulator, and automatic code generation tools to produce C and VHDL controller implementations. To demonstrate the language and the related tools, an example of a closed-loop brushless dc servo motor controller is presented. A prototype using the automatic generated VHDL code was implemented on a field-programmable gate array (FPGA) board. © 2016 IEEE.


Montezuma P.,New University of Lisbon | Montezuma P.,Telecommunications Institute of Portugal | Montezuma P.,Institute Desenvolvimento Of Novas Tecnologias | Dinis R.,New University of Lisbon | Dinis R.,Telecommunications Institute of Portugal
Proceedings - International Conference on Computer Communications and Networks, ICCCN | Year: 2015

In wireless communication systems privacy among users contents is a crucial security requirement such as power and spectral efficiency. Spectral and power efficiencies are attainable with power efficient transmission schemes where constellations are decomposed into several BPSK (Bi Phase Shift Keying), being each one amplified and transmitted independently by an antenna. Besides that, due to constellation shaping on the desired transmission direction performed by these transmitters, some kind of physical layer security is assured as well. Under this approach, security is achieved by constellation shaping of the transmitted constellation since each user must know the transmitter configuration parameters associated to the constellation shaping, i.e., the direction in which the constellation is optimized, otherwise the received data would be meaningless. Commonly, security is assured by encrypted algorithms implemented by higher layers, such as private and public encrypted keys. However, system security can be improved with physical layer security schemes since they can be complemented with other security schemes from higher layers. Simulation results show the effectiveness of the proposed approach. © 2015 IEEE.


Montezuma P.,New University of Lisbon | Montezuma P.,Institute Desenvolvimento Of Novas Tecnologias | Dinis R.,New University of Lisbon | Dinis R.,Telecommunications Institute of Portugal | And 2 more authors.
IEEE Wireless Communications and Networking Conference, WCNC | Year: 2010

Nonlinear operations are usually regarded as something undesirable that should be avoided in digital communication systems since they lead to performance degradation, namely spectral widening and decrease in power efficiency, for a given modulations. In this paper we show that the adoption of appropriate nonlinear devices can allow an improvement on the performance of some modulation schemes, either for OQPSK-type schemes (Offset Quadrature Phase Shift Keying) or TC-OQAM (Trellis Coded Offset Quadrature Amplitude Modulation). We present an analytical characterization of these signals after a bandpass memoryless nonlinear device. It is shown that an encoder followed by a nonlinear amplifier can be viewed as a serial concatenated coding scheme and the coding gain of such scheme can be improved relatively to the linear transmission scheme. ©2010 IEEE.


Jardim-Goncalves R.,New University of Lisbon | Sarraipa J.,Institute Desenvolvimento Of Novas Tecnologias | Agostinho C.,Institute Desenvolvimento Of Novas Tecnologias | Panetto H.,University of Lorraine
Journal of Intelligent Manufacturing | Year: 2011

Nowadays, competition is experienced not only among companies but among global supply chains and business networks. There is a demand for intelligent world-class solutions capable of reinforcing partnerships and collaborations with an improved cross-cultural understanding. However due to the proliferation of terminology, organizations from similar business environments have trouble cooperating, and are experiencing difficulties exchanging electronically vital information, such as product and manufacturing data, even when using international standards. To address similar interoperability problems, the Intelligent manufacturing systems program ( http://www.ims.org/content/glossary ) is providing an opportunity to develop industry-led R&D initiatives, building common semantics and integrated solutions. The SMART-fm project was one of those initiatives. It led to the development of the international standard for product data representation and exchange in the furniture sector (ISO 10303-236) and identified the challenge of semantic interoperability which is today a major challenge in modern enterprise integration. This paper presents a knowledge framework to address that challenge and make interoperable intelligent manufacturing systems a reality. It proposes to use semantically enriched international product data standards, and knowledge representation elements as a basis for achieving seamless enterprise interoperability. © 2009 Springer Science+Business Media, LLC.


Neeli-Venkata R.,Tampere University of Technology | Martikainen A.,Tampere University of Technology | Gupta A.,Tampere University of Technology | Goncalves N.,Tampere University of Technology | And 2 more authors.
Journal of Bacteriology | Year: 2016

Escherichia coli segregates protein aggregates to the poles by nucleoid exclusion. Combined with cell divisions, this generates heterogeneous aggregate distributions in subsequent cell generations. We studied the robustness of this process with differing medium richness and antibiotics stress, which affect nucleoid size, using multimodal, time-lapse microscopy of live cells expressing both a fluorescently tagged chaperone (IbpA), which identifies in vivo the location of aggregates, and HupA-mCherry, a fluorescent variant of a nucleoid-associated protein. We find that the relative sizes of the nucleoid's major and minor axes change widely, in a positively correlated fashion, with medium richness and antibiotic stress. The aggregate's distribution along the major cell axis also changes between conditions and in agreement with the nucleoid exclusion phenomenon. Consequently, the fraction of aggregates at the midcell region prior to cell division differs between conditions, which will affect the degree of asymmetries in the partitioning of aggregates between cells of future generations. Finally, from the location of the peak of anisotropy in the aggregate displacement distribution, the nucleoid relative size, and the spatiotemporal aggregate distribution, we find that the exclusion of detectable aggregates from midcell is most pronounced in cells with mid-sized nucleoids, which are most common under optimal conditions. We conclude that the aggregate management mechanisms of E. coli are significantly robust but are not immune to stresses due to the tangible effect that these have on nucleoid size. © 2016, American Society for Microbiology. All Rights Reserved.


PubMed | Tampere University of Technology and Institute Desenvolvimento Of Novas Tecnologias
Type: Journal Article | Journal: Molecular microbiology | Year: 2016

In Escherichia coli, under optimal conditions, protein aggregates associated with cellular aging are excluded from midcell by the nucleoid. We study the functionality of this process under sub-optimal temperatures from population and time lapse images of individual cells and aggregates and nucleoids within. We show that, as temperature decreases, aggregates become homogeneously distributed and uncorrelated with nucleoid size and location. We present evidence that this is due to increased cytoplasm viscosity, which weakens the anisotropy in aggregate displacements at the nucleoid borders that is responsible for their preference for polar localisation. Next, we show that in plasmolysed cells, which have increased cytoplasm viscosity, aggregates are also not preferentially located at the poles. Finally, we show that the inability of cells with increased viscosity to exclude aggregates from midcell results in enhanced aggregate concentration in between the nucleoids in cells close to dividing. This weakens the asymmetries in aggregate numbers between sister cells of subsequent generations required for rejuvenating cell lineages. We conclude that the process of exclusion of protein aggregates from midcell is not immune to stress conditions affecting the cytoplasm viscosity. The findings contribute to our understanding of E. colis internal organisation and functioning, and its fragility to stressful conditions.


PubMed | Tampere University of Technology and Institute Desenvolvimento Of Novas Tecnologias
Type: Journal Article | Journal: Journal of bacteriology | Year: 2016

Escherichia coli segregates protein aggregates to the poles by nucleoid exclusion. Combined with cell divisions, this generates heterogeneous aggregate distributions in subsequent cell generations. We studied the robustness of this process with differing medium richness and antibiotics stress, which affect nucleoid size, using multimodal, time-lapse microscopy of live cells expressing both a fluorescently tagged chaperone (IbpA), which identifies in vivo the location of aggregates, and HupA-mCherry, a fluorescent variant of a nucleoid-associated protein. We find that the relative sizes of the nucleoids major and minor axes change widely, in a positively correlated fashion, with medium richness and antibiotic stress. The aggregates distribution along the major cell axis also changes between conditions and in agreement with the nucleoid exclusion phenomenon. Consequently, the fraction of aggregates at the midcell region prior to cell division differs between conditions, which will affect the degree of asymmetries in the partitioning of aggregates between cells of future generations. Finally, from the location of the peak of anisotropy in the aggregate displacement distribution, the nucleoid relative size, and the spatiotemporal aggregate distribution, we find that the exclusion of detectable aggregates from midcell is most pronounced in cells with mid-sized nucleoids, which are most common under optimal conditions. We conclude that the aggregate management mechanisms of E. coli are significantly robust but are not immune to stresses due to the tangible effect that these have on nucleoid size.Escherichia coli segregates protein aggregates to the poles by nucleoid exclusion. From live single-cell microscopy studies of the robustness of this process to various stresses known to affect nucleoid size, we find that nucleoid size and aggregate preferential locations change concordantly between conditions. Also, the degree of influence of the nucleoid on aggregate positioning differs between conditions, causing aggregate numbers at midcell to differ in cell division events, which will affect the degree of asymmetries in the partitioning of aggregates between cells of future generations. Finally, we find that aggregate segregation to the cell poles is most pronounced in cells with mid-sized nucleoids. We conclude that the energy-free process of the midcell exclusion of aggregates partially loses effectiveness under stressful conditions.


Gomes L.,New University of Lisbon | Gomes L.,Institute Desenvolvimento Of Novas Tecnologias | Lourenco J.,Empresa de Investigacao e Desenvolvimento de Electronica EID
IEEE Transactions on Industrial Electronics | Year: 2010

This paper describes a tool framework allowing the rapid prototyping of an animated synoptic application associated with an embedded system controller. The motto for developing this tool framework is to be able to automatically generate controllers with associated graphical user interface (GUI) without writing a line of execution code; instead, the tool framework will provide specific aids allowing the designer to define the controller behavior and associated GUI (including static parts and intended dynamics). The behavior of the controller is described through a low-level Petri-net model, and the tool framework supports the definition of characteristics for the intended GUI and the association of the characteristics of the Petri-net behavioral model with specific characteristics of the GUI through a set of dedicated rules. Two main tools are described. The first one, named as Animator, allows an interactive definition of the graphical characteristics of the synoptic and automatic code generation. The second one, named as Synoptic, is responsible for the embedded control-execution part, integrating real-time updating of the GUI. The application of the tool framework to a simple automation system, namely, to the controller of a manufacturing system composed of a four-cell first-infirst-out system, is presented. © 2006 IEEE.


Marques M.,Institute Desenvolvimento Of Novas Tecnologias | Neves-Silva R.,New University of Lisbon
Journal of Cleaner Production | Year: 2015

LifeSaver project congregates the development of contextualized decision support approach for energy savings and emissions trading. This approach aims at supporting industrial users in selecting the best alternative to ensure minimization of energy consumption during the production process as well as support to emissions trading market. LifeSaver provides decision support for: (i) immediate reaction and (ii) process reconfiguration and Emission Trading System. This categorization serves as base for defining the methods to be applied. The support for immediate reaction uses Case-based Reasoning together with probabilistic analysis. Process reconfiguration and ETS is implemented through the use of multi-criteria decision analysis based on MACBETH method, which has been adapted for LifeSaver specific characteristics. The paper proposes categorization of approaches, main criteria involved in the process and associated algorithms. Moreover the approaches proposed were successfully tested in industrial environment and the results obtained are here presented. © 2014 Elsevier Ltd. All rights reserved.


Stokic D.,Institute for Applied System Technology | Scholze S.,Institute for Applied System Technology | Barata J.,Institute Desenvolvimento Of Novas Tecnologias
IECON Proceedings (Industrial Electronics Conference) | Year: 2011

A new approach, based on self-learning embedded services, allowing for high adaptation and integration of complex, flexible production systems is presented. The context sensitive solution for adaptation of discrete, flexible assembly/manufacturing lines is proposed. The proposed solution includes context extractor, adapter and self-learning modules allowing for integration of the control and so-called secondary processes depending on the extracted context. Both context extraction and adapter are continuously learning and improving their performance. Service Oriented Architecture principles are used to implement these modules. Generic solution and specific applications in three various manufacturing environments are presented. © 2011 IEEE.

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