Publications

729 publications

• 2011

  Jitter Measurement on the Basis of High-precision Event Timer

  Yu.Artyukh, E.Boole

  Abstract

  <p>Yu.Artyukh, E.Boole. Jitter Measurement on the Basis of High-precision Event Timer, Metrology and Measurement Systems, 2011, No.3, pp.453-460.</p> <p><a href="http://www.google.lv/url?sa=t&amp;rct=j&amp;q=jitter%20measurement%20on%20the%20basis%20of%20high-precision%20event%20timer%20&amp;source=web&amp;cd=4&amp;ved=0CDcQFjAD&amp;url=http%3A%2F%2Fwww.metrology.pg.gda.pl%2Ffull%2F2011%2FM%26MS_2011_453.pdf&amp;ei=sxELT_GdLcv5sgaw9KyBDw&amp;usg=AFQjCNHHKnlvAnBKee1ra4fpPmQHbDg5nA&amp;sig2=MSCQt4iBeB0FisVv1q3nZg&amp;cad=rja" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2011

  Investigation of Time and Energy Consumption using the Physical Model

  Baums A., Gordjusins A., Kanonirs G.

  Abstract

  <p>Baums A., Gordjusins A., Kanonirs G., „Investigation of Time and Energy Consumption using the Physical Model”, Electronics and electrical engineering No. 5(111), Lithuania, Kaunas, 2011, pp. 85-88.<br /> Abstract</p> <p>A flexible physical model for the research robots is<br /> developed and published by the authors [1]. The purpose<br /> of this paper is to show the results of the physical model’s<br /> usage in real time systems. Investigations in this field are<br /> perspective for the general purpose robot design. At<br /> present a lot of autonomous general purpose indoor robots<br /> are produced for hospitals, housekeeping and etc. [2, 3].<br /> Autonomous non-military outdoor research robot Seekur<br /> and SegwayRMP400 are the wheel- drive based robots that<br /> is not a good choice for the mobile robots in a hard<br /> environment. For such conditions different military legged<br /> [4, 5] and caterpillar track based robots are proposed. Our<br /> autonomous mobile robot physical model platform is<br /> developed for the caterpillar track motion. Different<br /> machine vision, image analysis systems and navigation<br /> sensor modules were tested during the physical model<br /> development. Also different route planning algorithms<br /> were implemented and analyzed. Physical model is used<br /> for an autonomous outdoor mobile robot software<br /> development and student education.</p> <p><a href="http://internet.ktu.lt/lt/mokslas/zurnalai/elektr/z111/20__ISSN_1392-1215_Investigation%20of%20Time%20and%20Energy%20Consumption%20using%20the%20Physical%20Model.pdf" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2011

  Wireless Sensor Network for Distributed Measurement of Electrical Field

  A. Severdaks, G. Supols, M. Greitans, L. Selavo

  Abstract

  <p>A. Severdaks, G. Supols, M. Greitans, L. Selavo. ''Wireless Sensor Network for Distributed Measurement of Electrical Field'' , Electronics and Electrical Engineering. – Kaunas: Technologija, 2011. No. 1(107). pp. 7–10.<br /> Abstract</p> <p>This paper describes the design of a system for measuring electrical field using distributed sensors that have wireless communication capability. The design includes development of the sensor node hardware, the communication protocol and software. The major constraint for the system is to minimize the interference with the electrical field that is measured, which was one of the reasons for choosing wireless rather than wired connectivity between the sensors. The system was tested with 13 sensor nodes, however, it is designed to be scalable for more. A possible application is to measure the electric field under high voltage lines for diagnostic or monitoring purposes.</p> <p><a href="http://ebookbrowse.com/02-issn-1392-1215-wireless-sensor-network-for-distributed-measurement-of-electrical-field-pdf-d81872285" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2011

  Method for Fast and Complexity-Reduced Asymmetric Image Compression

  I.Bilinskis, A.Skageris, K.Sudars

  Abstract

  <p>I.Bilinskis, A.Skageris, K.Sudars. Method for Fast and Complexity-Reduced Asymmetric Image Compression, Electronics and Electrical Engineering, 2011, No. 4(110), pp.117-120.<br /> Abstract</p> <p>Standartised image compression/reconstruction algorithms are symmetric in the sense that the computational complexities characterizing image compression and reconstruction stages are almost equal. An approach to assymetric image compression is suggested and discussed. Image compression performed according to this approach is extremely simple and the computational burden of the commpression/reconstruction task is shifted assymetrically to the image reconstruction stage. This approach, based on typical DASP methods, is described and discussed. The described image compression/reconstruction algorithms have been evaluated both on the basis of computer simulations and experimental studies and the obtained results are given. Ill. 2, bibl. 3 (in English; abstracts in English and Lithuanian).</p> <p><a href="http://www.eejournal.ktu.lt/index.php/elt/article/view/303" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2011

  Tree Species Classification in Mixed Baltic Forest

  G.Erins, A.Lorencs, I.Mednieks, J.Sinica-Sinavskis

  Abstract

  <p>G.Erins, A.Lorencs, I.Mednieks, J.Sinica-Sinavskis. “Tree Species Classification in Mixed Baltic Forest,” Proceedings of 3rd Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS), 2011, pp.1-4.</p>
• 2011

  Performance Comparison of Methods for Tree Species Classification in Multispectral Images

  R. Dinuls, A. Lorencs, I. Mednieks

  Abstract

  <p>R. Dinuls, A. Lorencs, I. Mednieks. “Performance Comparison of Methods for Tree Species Classification in Multispectral Images,” Electronics and Electrical Engineering. Kaunas: Technologija, 2011, No.5(111), pp. 119–122.</p>
• 2011

  An Estimate of the Jitter of Test Generator Usig Time-Measuring Apparatus

  V.A. Bespalko, E.S. Bul.

  Abstract

  <p>V.A. Bespalko, E.S. Bul. An Estimate of  the Jitter of  Test Generator Usig Time-Measuring Apparatus. Measurement Techniques, Vol.54, No 6, 2011.</p>
• 2011

  Bezvadu tīkla arhitektūras īpatnības

  Abstract

  <p><span lang="LV">M.Broitmans, J.Ķikuts. Bezvadu tīkla arhitektūras īpatnības,-LU 69.konference, 2011, 93</span></p>
• 2010

  Advantages and limitations of an approach to bioimpedance data acquisition and processing relying on fast low bit rate ADCs

  I.Bilinskis, K.Sudars, M.Min, P.Annus

  Abstract

  <p>I.Bilinskis, K.Sudars, M.Min, P.Annus. Advantages and limitations of an approach to bioimpedance data acquisition and processing relying on fast low bit rate ADCs. Baltic Electronics Conference BEC 2010, Tallinn, Estonia, October 2010, pp. 245-248.<br /> Abstract</p> <p>Bioimpedance signal analysis has to be performed in a rather wide frequency range. If fast ADCs, capable of taking signal sample values at very high sampling frequencies, are used for that, their bit rates typically are very low. It is suggested to use pseudo-randomized quantizing and special methods for handling the obtained data to provide for bioimpedance data acquisition under the required conditions and for demodulation of multi-frequency carriers of bioimpedance signals in the required frequency range. The suggested methods are described, computer simulated and discussed.</p> <p><a href="http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F5621665%2F5629721%2F05631151.pdf%3Farnumber%3D5631151&amp;authDecision=-203" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Infrared Imaging System for Analysis of Blood Vessel Structure

  R.Fuksis, M.Greitans, O.Nikisins, M.Pudzs

  Abstract

  <p>R.Fuksis, M.Greitans, O.Nikisins, M.Pudzs. „Infrared Imaging System for Analysis of Blood Vessel Structure” „Electronics and Electrical Engineering”- Kaunas: Technologija, 2010, No.1(97), pp.45-48. .<br /> Abstract<br /> In this paper we discuss two basic systems for analysis of blood vessels for biometric purposes. The infrared palm images that contain information about blood vessel structure are taken using 7 different near infrared wavelengths. Ten images for each wavelength have been captured and analyzed. Image quality was determined by image processing and evaluation algorithms and after that IR imaging methods are compared by the implementation and the calculated effectiveness index. Ill. 7, bibl. 6, tabl. 1</p> <p><a href="http://www.ktu.lt/lt/mokslas/zurnalai/elektros_z/z97/09__ISSN_1392-1215_Infrared%20Imaging%20System%20for%20Analysis%20of%20Blood%20Vessel%20Structure.pdf" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Experimental Studies of Signal Digitizing Based on Sine-wave Reference Crossings

  I.Bilinskis, A.Skageris

  Abstract

  <p>I.Bilinskis, A.Skageris. Experimental Studies of Signal Digitizing Based on Sine-wave Reference Crossings. Electronics and Electrical Engineering - Kaunas: Technologija, 2010, No.4(100), pp.69-72.<br /> Abstract<br /> A system for experimental testing and evaluation of the earlier suggested and described signal digitizing method and techniques, based on detection of the time instants when crossings of this signal with a reference sine-wave take place, has been developed, made and is discussed in this paper. This approach to signal digitizing, while rather specific, is well suited for applications in the area of multi-channel data acquisition according to various scenarios. The discussed experimental set-up is flexibly adaptable to the varying digitizing conditions so that it covers the needs of the planned experimental investigations. Ill. 6, bibl. 3, tabl. 1</p> <p><a href="http://internet.ktu.lt/lt/mokslas/zurnalai/elektr/z100/16__ISSN_1392-1215_Experimental%20Studies%20of%20Signal%20Digitizing%20Based%20on%20Sine-wave%20Reference%20Crossings.pdf" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Reconstruction of the Corrective Component of the Transfer Function of the Interpolator

  A.S.Rybakov

  Abstract

  <p>A.S.Rybakov. Reconstruction of the Corrective Component of the Transfer Function of the Interpolator in the process of Calibration of the Precision Event Timer. Automatic Control and Computer Sciences, 2010, Vol. 44, No. 1, pp. 11–21.<br /> Abstract<br /> The peculiarities of the interpolation method based on digital signal processing are considered. It is shown that the transfer function of the interpolator may be represented by the composition<br /> of two functional components. A nonstatistical method of reconstruction of the form of the corrective component of the transfer function based on processing of the scatter diagram of the ordered pairs of the experimental and predicted data is investigated. It is shown that such pairs may be obtained in the process of periodic event flow timing with estimations of the time positions of the signal and the predetermined instants of the event occurrence being elements of the ordered pairs. The efficiency of the reconstruction method is illustrated by the experimental results.</p> <p><a href="http://springerlink.com/content/d24p30n658425662/fulltext.pdf" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Road Surface Monitoring Using Vehicular Sensor Networks with Microphones

  A. Mednis, G. Strazdins, M. Liepins, A. Gordjusins, L. Selavo

  Abstract

  <p>A. Mednis, G. Strazdins, M. Liepins, A. Gordjusins, L. Selavo. "RoadMic: Road Surface Monitoring Using Vehicular Sensor Networks with Microphones." "Communications in Computer and Information Science" , 2010, Vol.88, pp.417-429.<br /> Abstract<br /> Road surface analysis including pothole reports is an important problem for road maintainers and drivers. In this paper we propose a methodology for pothole detection using mobile vehicles equipped with off the shelf microphone and global positioning devices attached to an on-board computer. The approach is generic enough to be extended for other kind of event detection using different sensors as well. The vehicles are driving on public streets and measuring pothole induced sound signals. Our approach was tested and evaluated by real world experiments in a road segment for which we had established the ground truth beforehand. The results show pothole detection with high accuracy despite the background noise and other audio events.</p> <p><a href="http://www.springerlink.com/content/q3t5564544t8x188/fulltext.pdf" target="_blank" rel="noopener noreferrer">pdf</a> (Springer)</p> <p><a href="http://strazdins.lv/papers/mednis2010roadmic.pdf" target="_blank" rel="noopener noreferrer">pdf</a> (G. Strazdins personal page)</p>
• 2010

  Extension of Minimax Metod to Minimize Energy Consumption in Real time Embedded Systems

  A.Baums

  Abstract

  <p>A.Baums. Extension of Minimax Metod to Minimize Energy Consumption in Real time Embedded Systems. Automatic Control and Computer Science, 2010, Vol.44, No.6, pp.354-358.<br /> Abstract</p> <p>The modification and extension of the Minimax method, in which the slack time s ij is determined for the maximum frequency f max, is presented. A way of the determination of f min such that the Minimax method provides the minimum energy consumption is proposed. The possibility and results of the application of the Minimax method in real-time systems with jump-like changes of the supply voltage, as well as in systems with violation of hard deadlines, are demonstrated.</p> <p><a href="http://www.springerlink.com/content/70qut559g27rhg7h/" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Digital Representation of Analog Signals leading to their Energy-efficient Processing

  Y.Artyukh, I.Bilinskis, S.Roga, K.Sudars

  Abstract

  <p>Y.Artyukh, I.Bilinskis, S.Roga, K.Sudars. „Digital Representation of Analog Signals leading to their Energy-efficient Processing”. Proceedings of Green Information Technology Green IT 2010, (Electronic Proceedings) Singapore, October 2010. pp.9-16.</p> <p><a href="http://www.mendeley.com/research/digital-representation-analog-signals-leading-energyefficient-processing/" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Reconstruction of sequences of arbitrary-shaped pulses from its low-pass or band-pass approximations using spectrum extrapolation

  Modris Greitans, Rolands Shavelis

  Abstract

  <p>Modris Greitans, Rolands Shavelis “Reconstruction of sequences of arbitrary-shaped pulses from its low-pass or band-pass approximations using spectrum extrapolation”, Proceedings of the 18th European Signal Processing Conference EUSIPCO 2010, Aalborg, Denmark, Aug., 2010, pp. 1607-1611.<br /> ABSTRACT<br /> The paper discusses the problem of processing short-time pulse sequences. Since the spectrum of such signals occupies wide range, it is difficult to sample them at the Nyquist rate. Instead, the approach used for processing signals with finite rate of innovations is employed – sequence of pulses is filtered with low-pass or band-pass filter before sampling. A waveform reconstruction method is proposed, which is based<br /> on spectrum extrapolation in an iterative way. Due to spectral function of sequence of pulses is correlated, it is possible to recover sequences, which combine arbitrary-shaped pulses. In simulations three shapes of Gaussian based pulses are used as an example. Results demonstrate reconstruction of sequences of pulses from its low-pass and band-pass approximations. An application of the results can be used in ultra wideband impulse radio systems.</p> <p><a href="http://www.eurasip.org/Proceedings/Eusipco/Eusipco2010/Contents/papers/1569292079.pdf" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Pulse former with picosecond front on impact avalanche transit-time diode

  M. Greitans, V.N. Aristov, E. Hermanis

  Abstract

  <p>M. Greitans, V.N. Aristov, E. Hermanis."Pulse former with picosecond front on impact avalanche transit-time diode", Automatic Control and Computer Sciences, 2010.,Vol.44, No.5, pp.15-23.<br /> Abstract<br /> Possibility of forming of impulses is investigated by means of impact avalanche transit-time diode, working in the anomalous mode.<br /> A circuit is shown, realizing forming of impulses. Results of tests of circuit and simulation data are shown, showing efficiency of the offered mode for the pulse generation with picosecond front.</p>
• 2010

  Adaptive Methods in Discrete Stroboscopy

  V. Karklin’sh and K. Krumin’sh

  Abstract

  <p>V. Karklin’sh and K. Krumin’sh. Adaptive Methods in Discrete Stroboscopy. Automatic Control and Computer Sciences, 2010, Vol. 44, No. 5, pp. 266–271.<br /> Abstract</p> <p>We offer three expansion methods of the amplitude (dynamic) range in the discrete stroboscopic signal conversion. Methods are developed, based on the classical methods of discrete stroboscopic signal conversion - the statistical method and "up-and-down" method. Suggested methods are called adaptive, because they use additional information about the behavior of the converted signal, received in a given phase of the measurement signal, or information obtained in the previous one phase of the measurement. The effectiveness of the proposed methods is illustrated by statistical modeling of the ultrawideband radar signal model - the harmonic oscillation transformation.</p> <p><a href="http://www.springerlink.com/content/k17382h317452622/" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Palm Vein Biometrics Based on Infrared Imaging and Complex Matched Filtering

  M. Greitans, M. Pudzs, R. Fuksis

  Abstract

  <p>M. Greitans, M. Pudzs, R. Fuksis. ”Palm Vein Biometrics Based on Infrared Imaging and Complex Matched Filtering”, The 12th ACM Multimedia and Security Workshop MM&amp;Sec, Rome, Italy, 9-10, September 2010.g. pp. 101-106.<br /> ABSTRACT<br /> In this paper, the use of the palm vein pattern for biometrics is discussed. To obtain pictures of blood vessels, two methods of infrared imaging – reflection and transmission are investigated. Basic image processing methods for extraction of vein structure are discussed. Complex matched filtering result provides matching intensity vectors that are used to segment the vessels. The similarity index of vector sets of two images is introduced to recognize vein pattern of the individual person. Experimental results of person identification are obtained using palm infrared image database from 50 people. The achieved Equal error rate of proposed method for the used database is 0.17%.</p> <p><a href="http://dl.acm.org/citation.cfm?id=1854250&amp;dl=ACM&amp;coll=DL&amp;CFID=61427255&amp;CFTOKEN=33898130" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Increasing the Reliability of Biometric Verification by using 3D Face Information and Palm Vein Patterns

  O. Nikisins, M. Greitans, R. Fuksis, M. Pudzs, Z. Serzane

  Abstract

  <p>O. Nikisins, M. Greitans, R. Fuksis, M. Pudzs, Z. Serzane. “Increasing the Reliability of Biometric Verification by using 3D Face Information and Palm Vein Patterns”, BIOSIG2010, Darmstadt, Germany, 09.-10. September.2010.g.133-138.<br /> ABSTRACT<br /> The improvement of the reliability for biometric image-based identification systems is discussed in this paper. Accuracy rising of the verificationprocess is based on two main principles: implementation of multidimensionalityand advanced image acquisition. The multidimensionality principle is based ontwo factors: the system structure (multimodality of biometric system) and theacquired biometric data (visual and spatial information about the object). Theadvanced image acquisition is based on multi-view principle and photography thatis sensitive in infrared spectrum.</p>