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7th International Conference on Computer Supported Education, CSEDU 2015

作者： Melo, T.R. Silva, L.C. Perkusich, A. Silva, J.J. Da Rocha Neto, J.S. Post-Graduate Program in Electrical Engineering-PPgEE-COPELE Campina Grande-PB Brazil Campina Grande-PB Brazil Campina Grande-PB58429-900 Brazil

ISBN: (纸本)9789897581083

This paper describes the usage of the Matlab/Simulink and Ptolemy II environments as learning tools in the implementation of simulation models, which represent the decentralized multi-loop control system proposed for a fouling detection didactic platform. The platform is treated as a two-input two-output (TITO) plant with time delay, i.e., the voltage and current as the plant inputs and the flow and preßure as the plant outputs. In both the software environments, the control system is modeled as a cyber-physical system (CPS). Constructive details of each simulation model are shown, even as the main advantages and disadvantages of each learning tool are discußed and evaluated by engineering students.

关键词： Simulink

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Analysis and design of an embedded system to aid the navigation of the visually impaired

Analysis and design of an embedded system to aid the navigat...

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2013 4th ISSNIP-IEEE Biosignals and Biorobotics Conference: Biosignals and Robotics for Better and Safer Living, BRC 2013

作者： Guimaraes, Carlos Solon S. Bayan Henriques, Renato V. Pereira, Carlos Eduardo Post Graduate Program in Electrical Engineering - PGPEE Federal University of Rio Grande Do sui - UFRGS Avenue Osvaldo Aranha 103 Porto Alegre RS Brazil

ISBN: (纸本)9781467330244

This article aims to present the methodologies of development, analysis and system design of an Electronic Bengal, with object-oriented and structured methods, trying to establish the main features of these. From this scenario, several methods of system analysis are available for use. Among the studies conducted to develop the system, using automation techniques, are SART (Structured Analysis Real-Time) and UML (Unified Modeling Language) modelings. Each has its peculiarities, both in the way of diagramming and about the script. The project proposes an electronic device with an embedded system that contains a control algorithm to enable vibration and audio electromechanical transducers. The project is an electronic device based on open-source flexible platforms to assist in the orientation and mobility of the visually impaired during their displacement. © 2013 IEEE.

关键词： Embedded systems

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A problem-based learning case study for teaching voice over internet protocol - VoIP: Using asterisk as a tool for teaching VoIP for information technology classes

A problem-based learning case study for teaching voice over ...

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6th International Conference on Computer Supported Education, CSEDU 2014

作者： Dias, M.C. Gabi, C.F. Rodrigues, E.P. Souza, V.R. Perkusich, A. Coordination of Electrical Engineering Federal Institute of Education Science and Technology of Paraíba - IFPB João Pessoa Brazil Post-Graduate Program in Electrical Engineering - PpgEE - COPELE Electrical Engineering Department Federal University of Campina Grande - UFCG Campina Grande Brazil

ISBN: (纸本)9789897580215

This paper shows the use of PBL (Problem-Based Learning) technique as a key to learning VoIP in courses like electrical engineering and Computer Networks in conjunction with open source and the public domain software called Asterisk which was used to create the scenario of the experiment and the problems presented to the students. In order to make the validation, the experiment was applied to students of Bachelor in electrical engineering and in Communication Technology System, undergraduate courses at the Federal Institute of Education, Science and Technology of Paraíba - IFPB, in the Telephony subject, with promising results. The Asterisk software was presented as a useful and flexible tool for constructing scenarios and problems for the teaching of VoIP technologies and the used approach resulted as effective for improving the attainment of the defined learning objectives.

关键词： Teaching

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Multi-agent Architecture for Passive Rootkit Detection with Data Enrichment

Multi-agent Architecture for Passive Rootkit Detection with...

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International Conference on Computer Science, Electronics, and Industrial engineering, CSEI 2022

作者： Trinks, Maickel Gondim, João Albuquerque, Robson Professional Post-Graduate Program in Electrical Engineering - PPEE - Department of Electrical Engineering University of Brasília DF Brasília Brazil Department of Computer Science Universidade de Brasília DF Brasília Brazil

ISBN: (纸本)9783031305917

The added value of the information transmitted in a cybernetic environment has resulted in a sophisticated malicious actions scenario aimed at data exfiltration. In situations with advanced actors, like APTs, such actions use obfuscation techniques of harmful activities as persistence assurance on strategic targets. The MADEX and NERD architectures proposed flow analysis solutions to detect rootkits that hide network traffic;however, it presents some operational cost, either in traffic volume or due to lack of aggregated information. In that regard, this work changes and improves user flow analysis techniques to eliminate impacts on network traffic, with data enrichment on local and remote bases, detection of domains consulted by rootkits and aggregation of information to generate threat intelligence, while maintaining high performance. The results show the possibility of aggregating information to data flows used by rootkits in order to have effective cyber defense actions against cybernetic threats without major impacts on the existing network infrastructure. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Multi agent systems

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Data processing system for denoising of signals in real-time using the wavelet transform

Data processing system for denoising of signals in real-time...

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3rd International Workshop on Intelligent Solutions in Embedded Systems, WISES'05

作者： Mota, Hilton De O. Vasconcelos, Flávio H. Electrical Engineering Post-graduate Program - PPGEE UFMG Centro Universitário de Belo Horizonte Belo Horizonte Brazil Electrical Engineering Department UFMG - Universidade Federal de Minas Gerais Belo Horizonte Brazil

This paper describes a system able to acquire, process and eliminate noise in continuous streams of data in real-time. The signal processing algorithms were based on the discrete wavelet transform and employ a new approach to deal with border problems, allowing to process the data continuously. The system was implemented using a DSP coupled to a digitizer through its external memory bus to guarantee deterministic behavior while maintaining some degree of flexibility in its configuration. The achieved performance and potential applications are discussed at the end of the text.

关键词： Real time systems

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Single-Phase Transformerless UPS with Interleaved Boost Converters for Battery Discharging

Single-Phase Transformerless UPS with Interleaved Boost Conv...

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2023 IEEE Energy Conversion Congress and Exposition, ECCE 2023

作者： Pinto, Alan R. A. Bahia, Filipe A. C. Souza, Reuben P. R. Pinheiro, José R. Costa, Fabiano F. Federal University of Bahia Post-Graduate Program in Electrical Engineering - Ppgee Salvador Brazil Federal University of Bahia Dept. of Electrical and Computer Engineering - Deec Salvador Brazil Federal University of Campina Grande Dept. of Electrical Engineering - Dee Campina Grande Brazil

ISBN: (纸本)9798350316445

This paper proposes a reconfiguration for a single-phase, double conversion uninterruptible power supply (UPS). With the addition of two static switches to the original circuit, the UPS mitigates the ripple in the current, through battery discharge performed by two legs. Other than these switches, the circuit topology is preserved. The preliminary results show a satisfactory level of ripples for the inductor current and suitable power quality for the output voltage. © 2023 IEEE.

关键词： battery mode discharger interleaved boost normal mode

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Feature extraction techniques based on power spectrum for a SSVEP-BCI

Feature extraction techniques based on power spectrum for a ...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Javier Castillo Sandra Müller Eduardo Caicedo Teodiano Bastos Post-Graduate Program of Electrical Engineering Federal University of Espirito Santo Vitoria Brazil Post-Graduate Program of Electrical Engineering University of Valle Cali Valle Colombia

ISBN: (纸本)9781479924004

This paper presents a comparison among three methods for Steady-State Visually Evoked Potentials (SSVEP) detection. These techniques are based on Power Spectral Density Analysis (PSDA) and Canonical Correlation Analysis (CCA). The first method estimates the signal-to-noise ratio of the power spectrum in each stimulus frequency using PSDA, which is called Traditional-PSDA. The second analysis estimates the relation between the difference of the stimulus frequency and its neighbor frequencies, using the power spectrum in these neighbor frequencies, and seeks the neighbor frequency which present the lowest relation value. This technique is referred to Ratio-PSDA. The third and final technique called Hybrid-PSDA-CCA. The performances of the methods were evaluated using a database of electroencephalogram (EEG) signals. The EEG signals were recorded from 19 volunteers, from which six people present disabilities. They were stimulated with visual stimuli flickering at 5.6, 6.4, 6.9 and 8.0 Hz. The system performance was evaluated considering the accuracy and the Information Transfer Rate (ITR) for each stimulus frequency. The results showed that the Hybrid-PSDA-CCA method achieved the best result with an average accuracy of 91.44%.

关键词： Electroencephalography Correlation Electric potential Brain-computer interfaces Equations Frequency estimation Accuracy

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Fuzzy set-based multiobjective allocation of resources: Solution algorithms and applications

Fuzzy set-based multiobjective allocation of resources: Solu...

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作者： Carvalho, Milene B. Ekel, Petr Ya. Martins, Carlos A.P.S. Pereira Jr., Joel G. Post Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Av. Dom Jose Gaspar 500 30535-610 Belo Horizonte MG Brazil

This paper presents results of research in the use of the Bellman-Zadeh approach to decision- making in a fuzzy environment for solving multiobjective optimization problems. Its application conforms to the principle of guaranteed result and provides constructive lines in obtaining harmonious solutions on the basis of analyzing associated maxmin problems. The application of the approach permits one to realize an effective (from the computational standpoint) as well as rigorous (in view of obtaining solutions from the Pareto set) method of analyzing multiobjective models. The use of the Bellman-Zadeh approach has served as a basis for solving problems of multiobjective allocation of resources (or their shortages) and developing a corresponding adaptive interactive decision making system (AIDMS). Its calculating kernel permits one to solve maxmin problems using an algorithm based on a non-local search (modification of Gelfand's and Tsetlin's "long valley" method) as well as a genetic algorithm. The comparison of their computational performance is given on the basis of solving problems of multiobjective power shortage allocation in power systems. © 2005 Elsevier Ltd. All rights reserved.

关键词： Resource allocation

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Multiple Criteria Analysis for Energy Storage Selection

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Energy and Power engineering 2011年第4期3卷 557-564页

作者： Alexandre Barin Luciane N. Canha Alzenira R. Abaide Karine F. Magnago Breno Wottrich Ricardo Q. Machado Federal University of Santa Maria Post-Graduate Electrical Engineering Program Center for Energy and Environment Studies

In view of the current and predictable energy shortage and environmental concerns, the exploitation of renewable energy sources offers great potential to meet increasing energy demands and to decrease depend- ence on fossil fuels. However, introducing these sources will be more attractive provided they operate in conjunction with energy storage systems (ESS). Furthermore, effective energy storage management is essential to achieve a balance between power quality, efficiency, costs and environmental constraints. This paper presents a method based on the analytic hierarchy process and fuzzy multi-rules and multi-sets. By exploiting a multiple criteria analysis, the proposed methods evaluate the operation of storage energy systems such as: pumped hydro and compressed air energy storage, H2, flywheel, super-capacitors and lithium-ion storage as well as NaS advanced batteries and VRB flow battery. The main objective of the study is to find the most appropriate ESS consistent with a power quality priority. Several parameters are used for the investigation: efficiency, load management, technical maturity, costs, environmental impact and power quality.

关键词： Multiple Criteria Analysis Fuzzy Sets AHP Method Energy Storage Systems Power Quality

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Fuzzy Preference Relations: Methods and Power engineering Applications

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OPSEARCH 2017年第1期39卷 34-45页

作者： Petr Ya. Ekel Luiz D. B. Terra Post Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Brazil

Two classes of problems are considered within the framework of a general approach to solve optimisation problems with fuzzy coefficients, referred to as and models in the literature. This paper is concerned with the latter and proposes an approach which replaces the initial problem by a set of associated mutually interrelated models. To reduce the decision uncertainty region, the problem is converted to a multicriteria decision problem in a fuzzy environment using two methods. The first method reduces the region sequentially through a step-by-step comparison of alternatives. The second method analyses membership functions of a subset of non-dominated alternatives, considering all criteria simultaneously. The results have general applicability and are being used in power engineering planning in Brazil.

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