Publikācijas

729 publikācijas

• 2013

  Implementation of Participatory Sensing Approach in Mobile Vehicle Based Sensor Networks

  Artis Mednis

  Kopsavilkums

  <p>Artis Mednis. Implementation of Participatory Sensing Approach in Mobile Vehicle Based Sensor Networks. Baltic Journal of Modern Computing, vol. 1, Issue 1-2, August 2013, p. 1-8.<br /> Abstract</p> <p>In this paper author describes his research with the goal to develop and experimen-tally verify specific data recording and processing methodologies based on participatory sensing<br /> approach implementation inmobile vehicle based sensor networks. To reach this goal, author per-formed study of literature, testing of hypothesis using general purpose computer devices, adapta-tion of smartphones for participatory sensing, development of special purpose embedded devices,<br /> practical experiments with selected technical equipment and software as well as gathering of ex-perimental results and following statistical analysis. The result of this research are several data<br /> acquisition and processing methodologies based on participatory sensing approach and mobile<br /> vehicle based sensor networks as well as evaluation of these methodologies.</p> <p><a href="http://www.google.com/url?q=http%3A%2F%2Fwww.lu.lv%2Ffileadmin%2Fuser_upload%2Flu_portal%2Fprojekti%2Fbjmc%2FContents%2F1_1-2_1_Mednis.pdf&amp;sa=D&amp;sntz=1&amp;usg=AFrqEzesykawfuy3JIW_AkEyzoQ1IY5Wvg" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2013

  Wireless Sensor Network Operating System Design Rules Based on Real-World Deployment Survey

  G. Strazdins, A. Elsts, K. Nesenbergs, L. Selavo

  Kopsavilkums

  <p>G. Strazdins, A. Elsts, K. Nesenbergs, L. Selavo, "Wireless Sensor Network Operating System Design Rules Based on Real-World Deployment Survey", Journal of Sensor and Actuator Networks, 2013, 2(3):509-556.<br /> Abstract</p> <p>Wireless sensor networks (WSNs) have been a widely researched field since the beginning of the 21st century. The field is already maturing, and TinyOS has established itself as the de facto standard WSN Operating System (OS). However, the WSN researcher community is still active in building more flexible, efficient and user-friendly WSN operating systems. Often, WSN OS design is based either on practical requirements of a particular research project or research group's needs or on theoretical assumptions spread in the WSN community. The goal of this paper is to propose WSN OS design rules that are based on a thorough survey of 40 WSN deployments. The survey unveils trends of WSN applications and provides empirical substantiation to support widely usable and flexible WSN operating system design.</p> <p><a href="http://www.mdpi.com/2224-2708/2/3/509" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2013

  The use of the correlation method in evaluating the accuracy characteristics of precision instruments

  V. A. Bespal’ko, E. S. Boole, A. S. Rybakov.

  Kopsavilkums

  <p>V. A. Bespal’ko, E. S. Boole, A. S. Rybakov. The use of the correlation method in evaluating the accuracy characteristics of precision instruments // Automatic Control and Computer Sciences.  2013, Volume 47, № 5, pp 276-282.</p>
• 2013

  Signal-dependent analog-to-digital conversion based on MINIMAX sampling (IEICE)

  I.Homjakovs, M.Hashimoto, T.Hirose and T.Onoye

  Kopsavilkums

  <p>I.Homjakovs, M.Hashimoto, T.Hirose and T.Onoye, „Signal-dependent analog-to-digital conversion based on MINIMAX sampling”, IEICE - Transactions on Fundamentals of Electronics, Communications and Computer Sciences, ISSN 0916-8508/ Vol.E96-A, No.2, pp.459-468, Feb. 2013.<br /> Abstract</p> <p>This paper presents an architecture of signal-dependent analog-to-digital converter (ADC) based on MINIMAX sampling scheme that allows achieving high data compression rate and power reduction. The proposed architecture consists of a conventional synchronous ADC, a timer and a peak detector. AD conversion is carried out only when input signal peaks are detected. To improve the accuracy of signal reconstruction, MINIMAX sampling is improved so that multiple points are captured for each peak, and its effectiveness is experimentally confirmed. In addition, power reduction, which is the primary advantage of the proposed signal-dependent ADC, is analytically discussed and then validated with circuit simulations.</p> <p><a href="http://i-scover.ieice.org/iscover/page/ARTICLE-91F2F0EF-E4C3-7493-EDB9-D2D698007E96" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2013

  Analysis of two-stage Bayes classifiers construction method: 2-dimensional case

  A.Lorencs, J.Sinica-Sinavskis

  Kopsavilkums

  <p>A.Lorencs, J.Sinica-Sinavskis, “Analysis of two-stage Bayes classifiers construction method: 2-dimensional case,” Automatic Control and Computer Sciences, September 2013, Vol. 47, No. 5, pp. 254-266, 2013.</p>
• 2013

  Регистрация дыхания человека по форме сшп импульсного сигнала на первой главной компоненте

  M.Greitāns, V.Aristovs, V.Petersons

  Kopsavilkums

  <p>M.Greitāns, V.Aristovs, V.Petersons „Регистрация дыхания человека по форме сшп импульсного сигнала на первой главной компоненте”, НАУЧНАЯ ПЕРСПЕКТИВА Научно-аналитический журнал (ISSN 2077-3153) 2 (36), 2013, lpp.71-73.</p> <p>http://www.naupers.ru/</p>
• 2013

  Импульсный локатор и метод главных компонент как средства анализа параметров дыхания

  V.Aristovs

  Kopsavilkums

  <p>V.Aristovs „Импульсный локатор и метод главных компонент как средства анализа параметров дыхания”, Альманах современной науки и образования. Тамбов:, Грамота, 2013. № 3, lpp.20-23 (ISSN 1993-5552)<br /> Abstract</p> <p>When a person is breathing there is a slight displacement of the chest. With a calm and unexcited healthy this shift is an average of 5-15 mm. The respiratory rate is not constant and varies within a wide range (0.1-0.8 Hz), depending on the condition, age and health. At the first stage it was appropriate as the research object instead of a person to use the layout of breath, swing vibrations of the plate which was chosen to be 10 mm, and the oscillation frequency varied widely from 0.24 Hz to 4.7 Hz. Formed ensemble reflections from the layout was processed method of principal components. Based on the results we can conclude the suitability of the method for the analysis of human breath.</p> <p>http://www.gramota.net/materials/1/2013/3/4.html</p>
• 2013

  UWB radar sees a human’s breathing in the space of principal components

  Vladimir Aristov

  Kopsavilkums

  <p>Vladimir Aristov, “UWB radar “sees” a human’s breathing in the space of principal components”, Applied Sciences in Europe: tendencies of contemporary development, 1st International Scientific conference, 21-22th March 2013, Stuttgart, Germany. (ISSN 2195-2183) lpp. 138-139.<br /> Abstract</p> <p>The present article reveals the approach to remote monitoring of human breathing through the transition into the space of principal components (Karhunen-Loeve transform). The initial data are sampled realization corresponding echo pulse UWB signal from breathing person.</p> <p>http://www.ortpublishing.de/</p>
• 2013

  Experimental Evaluation of Conditions for Short-Distance Transmission of Event Timing Data

  I.Bilinskis, A.Skageris, K.Sudars

  Kopsavilkums

  <p>I.Bilinskis, A.Skageris, K.Sudars, “Experimen tal Evaluation of Conditions for Short-Distance<br /> Transmission of Event Timing Data” Electronics and Electrical Engineering, Vol 19, No 4<br /> (2013), lpp. 57-60. (ISSN: 1392-1215)<br /> Abstract</p> <p>Specifics of event timing data transmission are experimentally investigated under conditions typical for multi-channel data acquisition from a large quantity of signal sources. The events, in the considered case, are analog input signal and sinusoidal reference function crossings. The<br /> sequences of the crossing time instants represent the respective analog input signals and these sequences have to be transmitted to the signal reconstruction subsystem. An experimental system for fast short-distance transmission has been built. It performs data encoding on the basis of digital pulse position modulation with 10 picoseconds resolution. The achievable data encoding resolution and other vital parameters characterizing data transmission systems of this type were evaluated on this basis.</p> <p><a href="http://www.eejournal.ktu.lt/index.php/elt/article/view/4055/2434" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2013

  Palmprint Image Processing With Non-Halo Complex Matched Filters For Forensic Data Analysis

  Mihails Pudzs, Rihards Fuksis and Modris Greitans

  Kopsavilkums

  <p>Mihails Pudzs, Rihards Fuksis and Modris Greitans "Palmprint Image Processing With Non-Halo Complex Matched Filters For Forensic Data Analysis", International Workshop on Biometrics and Forensics, IWBF 2013, Lisbon, Portugal, April 4-5, 2013</p>
• 2013

  Combined Adaptive Up and Down Method for Equivalent Time Signal Transformation

  K. Krumin’sh and V. Plotsin’sh

  Kopsavilkums

  <p>K. Krumin’sh and V. Plotsin’sh, "Combined Adaptive Up and Down Method for Equivalent Time Signal Transformation", "Automatic Control and Computer Sciences", 2013, Vol. 47, No. 5, pp. 283–288.<br /> Abstract</p> <p>A combined adaptive up and down method for comparator type equivalent<br /> time transformation is proposed. The method uses the signal increment at<br /> the preceding phase point of the signal as well as the data for the<br /> current signal phase. The efficiency of the proposed method is compared<br /> to those of other comparator type equivalent time methods. The method is<br /> investigated for implementation in UWB radars.</p>
• 2013

  Vehicle counting and motion direction detection using microphone array

  A.Severdaks, M.Liepins

  Kopsavilkums

  <p>A.Severdaks, M.Liepins. ''Vehicle counting and motion direction detection using microphone array'', 17th international conference Electronics 2013, Palanga, Lithuania, June 17-19,2013. Journal “Electronics and Electrical Engineering” (ISSN 1392-1215), vol.19 NO.8, 2013.<br /> Abstract</p> <p>This paper describes a method for counting the vehicles and estimating the direction of their motion using three equidistantly spaced microphones. Paper outlines hardware and software design. Algorithm is based on sound delay estimation between microphones. To implement vehicle counting, sound wave arrival angle is calculated from the derived delays. All measurements and tests took place in real traffic flow under different weather conditions.</p> <p><a href="http://www.eejournal.ktu.lt/index.php/elt/article/view/5400/2932" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2013

  A Method for Segment Based Surface Reconstruction from Discrete Inclination Values

  Krišjānis Nesenbergs, Atis Hermanis, Modris Greitāns

  Kopsavilkums

  <p>K. Nesenbergs, A. Hermanis, M. Greitāns, " A Method for Segment Based Surface Reconstruction from Discrete Inclination Values", 17th International Conference ELECTRONICS 2013, Palanga, Lithuania, June 17-19, 2013. 4 lpp. (ISI, EBSCO)</p> <p>All authors:</p> <p>Krišjānis Nesenbergs, Atis Hermanis, Modris Greitāns.</p> <p><strong>Abstract:</strong></p> <p>Object orientation tracking in local reference frame can serve as a useful tool in fields such as surface shape recognition. Often measurement methods provide incomplete data about object orientation. In this paper a method is proposed for selection of surface segment direction when only inclination levels of each segment are known. Method is applicable in cases when some additional constraints can be applied to the surface, such as limited flexion and segment layout. During surface model approximation a specially adapted exhaustive search algorithm is used to find the most appropriate segment direction angle to satisfy physical constraints of the surface. This method proved to significantly increase approximation precision of non-trivial surfaces</p>
• 2013

  Быстродействие стробоскопических методов преобразования зашумленных сигналов

  К. Круминьш и В. Плоциньш

  Kopsavilkums

  <p>К. Круминьш и В. Плоциньш, "Быстродействие стробоскопических методов преобразования зашумленных сигналов (обзор)" "Автоматика и вычислительная техника" Выпуск No.6 2013.g.</p>
• 2013

  Correlation Method for Estimation of Event Timing Precision

  V. A. Bespal’ko and A. S. Rybakov

  Kopsavilkums

  <p>V. A. Bespal’ko and A. S. Rybakov, “Correlation Method for Estimation of Event Timing Precision”, “Automatic Control and Computer Sciences” – AC&amp;CS, Allerton Press, Inc., Vol.47, Number 1, 2013, pp. 38-47. В.А. Беспалько и А.С. Рыбаков, „Корреляционный метод оценки точности таймирования событий”, ”Автоматика и вычислительная техника” – АВТ, Выпуск No. 1, 2013 (Vol. 47) с. 53-65.<br /> Abstract</p> <p>A method for estimation of event timing precision is proposed and investigated. The method is based on a correlation analysis of the results of measuring the time coordinates of the original and delayed event flows. The timing error variance estimates are shown not to be directly dependent on the volatility of the time coordinates of the flows. Estimates are obtained for the variance of a random interval between events in the flow and the variance of the delay of the time-shifted flow. The estimates contain no components associated with measurement error. The capabilities of the method are illustrated by the results of computer simulations and actual measurements.</p> <p><a href="http://link.springer.com/article/10.3103%2FS0146411613010033" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2013

  FPGA Implementation of CMF for Embedded Palm Biometric System

  Mihails Pudzs, Rihards Fuksis, Rinalds Ruskuls, Davis Barkans, Teodors Eglitis and Modris Greitans

  Kopsavilkums

  <p>Mihails Pudzs, Rihards Fuksis, Rinalds Ruskuls, Davis Barkans, Teodors Eglitis and Modris Greitans „FPGA Implementation of CMF for Embedded Palm Biometric System”, 21st European Signal Processing Conference, EUSIPCO 2013, Marrakech, Morocco, September 9-13, 2013.</p>
• 2013

  Compressive Sensing: Analysis of Signals in Radio Astronomy

  G. Gaigals, M. Greitans and A. Andziulis

  Kopsavilkums

  <p>G. Gaigals, M. Greitans and A. Andziulis, "Compressive Sensing: Analysis of Signals in Radio Astronomy", Baltic Astronomy, vol.22, pp. 347-361, 2013<br /> Abstract.</p> <p>The compressive sensing (CS) theory says that for some kind of signals<br /> there is no need to keep or transfer all the data acquired accordingly<br /> to the Nyquist criterion. In this work we investigate if the CS approach<br /> is applicable for recording and analysis of radio astronomy (RA)<br /> signals. Since CS methods are applicable for the signals with sparse<br /> (and compressible) representations, the compressibility of RA signals is<br /> verified. As a result, we identify which RA signals can be processed<br /> using CS, find the parameters which can improve or degrade CS<br /> application to RA results, describe the optimum way how to perform<br /> signal filtering in CS applications. Also, a range of virtual LabVIEW<br /> instruments are created for the signal analysis with the CS theory.</p>
• 2013

  A 0.8-V 110-nA Cmos Current Reference Circuit Using Subthreshold Operation

  I. Homjakovs, T. Hirose, Y. Osaki, M. Hashimoto, and T. Onoye

  Kopsavilkums

  <p>I. Homjakovs, T. Hirose, Y. Osaki, M. Hashimoto, and T. Onoye, "A 0.8-V 110-nA Cmos Current Reference Circuit Using Subthreshold Operation," IEICE Electronics Express (ELEX), vol. 10, no. 4, March 2013.<br /> Abstract</p> <p>This paper proposes a low voltage CMOS nano-ampere current reference circuit and presents its performance with circuit simulations in 180-nm technology. The proposed circuit consists of bias-voltage, current-source and offset-voltage sub-circuits with most of MOSFETs operating in subthreshold region. Simulation results show that the circuit generates a stable reference current of 110-nA in supply voltage range of 0.8-1.8-V with line sensitivity of 9250ppm/V. The proposed circuit is useful for composing a voltage reference circuit for ultra-low power applications.</p> <p><a href="https://www.jstage.jst.go.jp/article/elex/10/4/10_10.20130022/_article" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2013

  Demo Abstract: SEAL-Blockly: Sensor Network Visual Programming Using a Web Browser

  J. Judvaitis, A. Elsts and L. Selavo

  Kopsavilkums

  <p><u><span lang="EN-GB">J. Judvaitis</span></u><span lang="EN-GB">, A. Elsts and L. Selavo, “<em>Demo Abstract: SEAL-Blockly: Sensor Network Visual Programming Using a Web Browser”</em>, 10th European Conference on Wireless Sensor Networks (EWSN 2013), Poster and Demo Proceedings, Ghent, Belgium, 2013.</span></p>
• 2013

  Extended Fourier Series Representation of Signals With Time-Varying Bandwidth

  Kopsavilkums

  <p>R.Shavelis and M.Greitans, "Extended Fourier Series Representation of Signals With Time-Varying Bandwidth", ICICS 2013, Tainan, Taiwan, 10 - 13 December, 2013.<br /> Abstract</p> <p>The paper proposes an extension of the classical<br /> Fourier series for analysis of signals with time-varying spectral<br /> content. This, in comparison to classical series, allows reducing<br /> the number of coefficients that represent the signal if the<br /> fundamental frequency of the extended Fourier series is chosen<br /> according to the time-varying bandwidth of the signal. The<br /> advantage of the proposed series is demonstrated by numerical<br /> results for various test signals.</p> <p>http://www.icics.org/2013/</p>