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Brazilian Symposium on Computer Graphics and Image Processing (SIBGRAPI)

作者： Rafael Beserra Gomes Rafael Vidal Aroca Bruno Motta de Carvalho Luiz Marcos Garcia Gonçalves Department of Computing Engineering and Automation UFRN Natal Brazil Department of Informatics and Applied Mathematics UFRN Natal Brazil

We propose a novel and fast interactive segmentation methodology for computer vision applications. Basically, the proposed system performs the tracking of seeds so that multiple seeds can be acquired over time, substantially improving the segmentation results. Moreover, instead of image coordinates, the user indicates points in the real-world that become seeds in the image. These seeds can be indicated, for example using a laser pointer or a smart-phone. The seeds can then be tracked and used by a segmentation algorithm. Experiments using the Lucas-Kanade Optical Flow and the Fast Multi-Object Fuzzy Segmentation (Fast-MOFS) algorithm demonstrate that the proposed technique successfully segments images in real-time and improves the user ability to directly segment an object in the real world. The proposed system has a high performance, allowing it to be used with high frame rates in devices with low processing capability and/or with restricted power requirements.

关键词： Image segmentation Computer vision Radiation detectors Mobile handsets Laser applications Cameras

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Mechatronic design and control of rotary flexible joint

Mechatronic design and control of rotary flexible joint

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International (EPE-PEMC) Power Electronics and Motion Control Conference

作者： Šandor Ileš Ante Ivančić Jadranko Matuško Fetah Kolonić Faculty of Electrical Engineering and Computing Department of Electrical Machines Drives and Automation University of Zagreb Zagreb Croatia

The model of rotational mechanical system is laboratory model intended to emulate a flexible joint on a robot or spacecraft and is also useful in the study of vibration analysis and resonance. This system is similar in nature to the control problems encountered in large geared robot joints where flexibility is exhibited in the gearbox. The aim of this paper is to design such mechatronic system with considerable elasticity, for educational purposes, using computer aided design (CAD). Control algorithm is proposed for designed mechanical system in order to reduce effects of flexibility.

关键词： Mechatronics Software packages Computational modeling Joints

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Towards semantic and affective coupling in emotionally annotated databases

Towards semantic and affective coupling in emotionally annot...

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Proceedings of the International Convention MIPRO

作者： M. Horvat S. Popović K. Ćosić Faculty of Electrical Engineering and Computing Department of Electric Machines Drives and Automation University of Zagreb Zagreb Croatia

Emotionally annotated databases are repositories of multimedia documents with annotated affective content that elicit emotional responses in exposed human subjects. They are primarily used in research of human emotions, attention and development of stress-related mental disorders. This can be successfully exploited in larger processes like selection, evaluation and training of personnel for occupations involving high stress levels. Emotionally annotated databases are also used in multimodal affective user interfaces to facilitate richer and more intuitive human-computer interaction. Multimedia documents in emotionally annotated databases must have maximum personal ego relevance to be the most effective in all these applications. For this reason flexible construction of subject-specific of emotionally annotated databases is imperative. But current construction process is lengthy and labor intensive because it inherently includes an elaborate tagging experiment involving a team of human experts. This is unacceptable since the creation of new databases or modification of the existing ones becomes slow and difficult. We identify a positive correlation between the affect and semantics in the existing emotionally annotated databases and propose to exploit this feature with an interactive relevance feedback for a more efficient construction of emotionally annotated databases. Automatic estimation of affective annotations from existing semantics enhanced with information refinement processes may lead to an efficient construction of high-quality emotionally annotated databases.

关键词： Semantics Couplings Multimedia communication Multimedia databases Animals Ontologies

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Modification of synchronous generator cooling system control

Modification of synchronous generator cooling system control

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International Conference on Electrical Machines, ICEM

作者： I. Erceg D. Sumina M. Vrazic Department of Electric Machines drives and Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

The availability of a hydropower plant is very important. During the last few decades intermittent operation has increased, and power plants designed for base electrical energy production became the ones that cover peak power needs. This lead to greater strains on the stator package. Power generators are often very robust and can endure these new operating conditions but sometimes with reduced lifetime of stator package. Often, the main problem is a generator's cooling system. Older synchronous generators often have cooling system control with very rough steps. This paper describes such a generator, its problems and presents a possible solution for cooling system control.

关键词： Temperature measurement Generators Temperature sensors Cooling Mathematical model Stators

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Criteria for optimal design of interior permanent magnet motor series

Criteria for optimal design of interior permanent magnet mot...

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International Conference on Electrical Machines, ICEM

作者： Damir Žarko Stjepan Stipetić Department of Electrical Machines Drives and Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

This paper presents a general approach to the optimized design of a series of interior permanent magnet motors with the same lamination cross section. A concept of a referent and particular design has been introduced and analytical expressions which relate the principal machine parameters for the referent and particular machine have been derived. The referent design can be optimized according to a certain criterion which automatically yields the optimal design of the entire series. The particular designs are then obtained from the referent design by varying the stack length, the number of turns per coil and the number of parallel circuits. In order to demonstrate the correctness of the derived design principles the optimized design of a referent machine with IEC frame size 160 has been made by combining the finite-element method and Differential Evolution optimization algorithm from which five particular designs with power ratings ranging from 15 kW to 110 kW have been derived.

关键词： Torque Lamination Windings Optimization Couplings Coils Rotors

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The effect of clicking by smiling on the accuracy of head-mounted gaze tracking 12

The effect of clicking by smiling on the accuracy of head-mo...

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7th Eye Tracking Research and Applications Symposium, ETRA 2012

作者： Rantanen, Ville Verho, Jarmo Lekkala, Jukka Tuisku, Outi Surakka, Veikko Vanhala, Toni Sensor Technology and Biomeasurements Department of Automation Science and Engineering Tampere University of Technology Finland Research Group for Emotions Sociality and Computing School of Information Sciences University of Tampere Tampere Finland VTT Technical Research Centre of Finland Tampere Finland

ISBN: (纸本)9781450312257

The effect of facial behaviour on gaze tracking accuracy was studied while using a prototype system that integrated head-mounted, video-based gaze tracking and a capacitive facial movement detection for respective pointing and selecting objects in a simple graphical user interface. Experiments were carried out to determine how voluntary smiling movements that were used to indicate clicks affect the accuracy of gaze tracking due to the combination of user eye movement behaviour and the operation of gaze tracking algorithms. The results showed no observable degradation of the gaze tracking accuracy when using voluntary smiling for object selections. © 2012 ACM.

关键词： Eye tracking

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Biophotogrammetry Model of Respiratory Motion Analysis Applied to Children

Biophotogrammetry Model of Respiratory Motion Analysis Appli...

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34th Annual International Conference of the IEEE engineering-in-Medicine-and-Biology-Society (EMBS)

作者： Ripka, W. L. Ricieri, D. da V. Ulbricht, L. Neves, E. B. Stadnik, A. M. W. Romaneli, E. F. R. Electrical Engineering and Industrial Computing Program Federal University of Technology - Paraná Brazil Physical Education Department Federal University of Paraná Brazil Master Program in Biomedical Engineering Federal University of Technology - Paraná Brazil Federal University of Technology - Paraná. Brazil Physical Education Federal University of Technology - Paraná Brazil Control and Automation Engineering Federal University of Technology - Paraná Brazil

ISBN: (纸本)9781457717871

This study aimed to test a protocol of measurements based on Biophotogrammetry to Analysis of Respiratory Mechanics (BARM) in healthy children. Seventeen normal spirometric children (six male and 11 female) were tested. Their performed maneuvers of forced inspiratory vital capacity were recorded in the supine position. The images were acquired by a digital camera, laterally placed to the trunk. Surface markers allowed that the files, exported to CorelDraw (R) software, were processed by irregular trapezoids paths. Compartments were defined in the thoracic (TX), abdominal (AB) and the chest wall (CW). They were defined at the end of an inspiration and expiration, both maximum, controlled by a digital spirometer. The result showed that the measured areas at the inspiratory and expiratory periods were statistically different (p<0.05). It reflects the mobility of CW and compartments. In conclusion, the proposed method can identify the breathing pattern of the measured subject using images in two dimensions (2D).

关键词： respiratory mechanics chest wall respiratory movements photogrammetry children

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Discrete flight path angle tracking control of hypersonic flight vehicles via multi-rate sampling

Discrete flight path angle tracking control of hypersonic fl...

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2012 UKACC International Conference on Control, CONTROL 2012

作者： Xu, Bin Wang, Danwei Yang, Chenguang Li, Jing Wang, Shixing School of Automation Northwestern Polytechnical University Xi'an China School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore School of Computing and Mathematics Plymouth University United Kingdom Department of Mathematics Xidian University China Department of Computer Science Tsinghua University Beijing China

ISBN: (纸本)9781467315609

This paper presents the flight path angle tracking control of the longitudinal dynamics of a generic hypersonic flight vehicle(HFV). Due to the use of digital computers and microprocessors for controls applications, the discrete hypersonic flight control is investigated. The altitude command is transformed into the flight path angle information. The back-stepping scheme is applied for the attitude subsystem which includes flight path angle, pitch angle and pitch rate. The virtual control is designed with nominal feedback and Neural Network (NN) approximation. To use the information of throttle setting, the multi-rate sampling method is employed for the two subsystems where the velocity subsystem is considered as slow dynamics. Under the proposed controller, the semiglobal uniform ultimate boundedness (SGUUB) stability is guaranteed. The simulation is presented to show the effectiveness of the proposed control approach. © 2012 IEEE.

关键词： Digital computers

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Fault detection in a wastewater treatment plant based on neural networks and PCA

Fault detection in a wastewater treatment plant based on neu...

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Mediterranean Conference on Control and automation (MED)

作者： M.J. Fuente D. Garcia-Alvarez G.I. Sainz-Palmero P. Vega Department of Systems Engineering and Control University of Valladolid Valladolid Spain Department of Computing and Automation ETSII University of Sakamanca Bejar Salamanca Spain

In this paper, a neural network PCA method that integrates neural networks (NN) and principal component analysis (PCA) is used to detect faults in a wastewater treatment plant. The neural networks are used to calculate a non-linear and dynamic model of the process in normal operating conditions. PCA is used to generate monitoring charts based on the residuals calculated as the difference between the process measurements and the output of the networks. It can evaluate the current performance of the process and detects the faults. This technique has been applied to the simulation of a benchmark of a biological wastewater treatment process, a highly non-linear process. The simulation results clearly show the advantages of using this NNPCA monitoring in comparison with classical PCA monitoring.

关键词： Principal component analysis Monitoring Wastewater treatment Modeling Artificial neural networks Fault detection

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Output improvement of Sg. Piah run-off river hydro-electric station with a new computed river flow-based control system

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IOP Conference Series: Earth and Environmental Science 2013年第1期16卷

作者： Razali Jidin Bahari Othman Centre for Automation and Embedded Computing System (CAECS) College of Engineering Universiti Tenaga Nasional (UNITEN) Jalan IKRAM-UNITEN 43000 Kajang Malaysia Generation Research Department Tenaga Nasional Research Centre (TNBR) 43000 Kajang Selangor Malaysia

The lower Sg. Piah hydro-electric station is a river run-off hydro scheme with generators capable of generating 55MW of electricity. It is located 30km away from Sg. Siput, a small town in the state of Perak, Malaysia. The station has two turbines (Pelton) to harness energy from water that flow through a 7km tunnel from a small intake dam. The trait of a run-off river hydro station is small-reservoir that cannot store water for a long duration; therefore potential energy carried by the spillage will be wasted if the dam level is not appropriately regulated. To improve the station annual energy output, a new controller based on the computed river flow has been installed. The controller regulates the dam level with an algorithm based on the river flow derived indirectly from the intake-dam water level and other plant parameters. The controller has been able to maintain the dam at optimum water level and regulate the turbines to maximize the total generation output.

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