Publications

729 publications

• 2015

  Signal processing in a precision event timer with interpolation based on phase measurement.

  RYBAKOV, A.S., VEDIN, V.

  Abstract

  <p>RYBAKOV, A.S., VEDIN, V., 2015. Signal processing in a precision event timer with interpolation based on phase measurement. Automatic Control and Computer Sciences, Volume 49, Issue 3, pp. 177-188 (2015).</p>
• 2015

  Data acquisition and transmission based on application of high performance Event Timers

  BILINSKIS, I.; BOOLE, E.; SKAGERIS, A.

  Abstract

  <p>BILINSKIS, I.; BOOLE, E.; SKAGERIS, A. 2015. Data acquisition and transmission based on application of high performance Event Timers. “1-st International IEEE Conference on Advances in Wireless and Optical Communications 2015", pp. c1-c14. (Book with ISBN number will be issued by RTU Publishing House in 2015)</p>
• 2015

  Estimation of Analog-to-time and Time-to-digital Conversion Efficiency in Analog Optical Communication System Testbed

  MEZERINS, A., BESPALKO, V.

  Abstract

  <p>MEZERINS, A., BESPALKO, V., 2015. Estimation of Analog-to-time and Time-to-digital Conversion Efficiency in Analog Optical Communication System Testbed. Proc. of Advances in Wireless and Optical Communications 2015 (RTUWO'), Riga, November 5, 6, pp. b1-b4.</p>
• 2015

  LEDs based video camera pose estimation

  SUDARS, K., CACURS, R., HOMJAKOVS, I., JUDVAITIS, J.

  Abstract

  <p>SUDARS, K., CACURS, R., HOMJAKOVS, I., JUDVAITIS, J., 2015. LEDs based video camera pose estimation, Bulletin of the Polish Academy of Sciences, Technical Sciences, Col. 64 No 4 2015, pp 897-905. Impact factor: 0.91.</p> <div id="gtx-trans" style="position: absolute; left: -14px; top: 0px;"> <div class="gtx-trans-icon"></div> </div>
• 2015

  Complex Matched Filter for Line Detection

  PUDZS, M., FUKSIS, R., MUCINIEKS, A., GREITANS, M.

  Abstract

  <p>PUDZS, M., FUKSIS, R., MUCINIEKS, A., GREITANS, M. 2015. Complex Matched Filter for Line Detection, Proc. of ISPA 2015 conference.</p>
• 2015

  Identification of Characteristics of Two Terminal Networks from the Pulse Response of the Current

  HERMANIS, E., GREITANS, M., ARISTOVS, V., 2015

  Abstract

  <p>HERMANIS, E., GREITANS, M., ARISTOVS, V., 2015. Identification of Characteristics of Two Terminal Networks from the Pulse Response of the Current. ISSN 0146-4116, Automatic Control and Computer Sciences, 2015, Vol. 49, No. 4, pp. 239–244.</p>
• 2015

  Concept of Client-Server Environment for Agent-Based Modeling and Simulation of Living Systems

  RIBNERS, I., ARNICĀNS, G., 2015.

  Abstract

  <p>RIBNERS, I., ARNICĀNS, G., 2015. Concept of Client-Server Environment for Agent-Based Modeling and Simulation of Living Systems, Computational Intelligence, Communication Systems and Networks (CICSyN), 7th International Conference, pp.83-88.</p>
• 2015

  Benign – A typical nevi discrimination using diffuse reflecance and fluorescence multispectral imaging system

  JAKOVELS, D., SAKNīTE, I., BLIZNUKS, D., SPĪGULIS, J., KADIĶIS, R.

  Abstract

  <div>Early diagnostics of skin cancer is of interest for dermatologists. Atypical nevi are not considered to be malignant, but are suspects that should be detected and monitored over time. The multispectral imaging system <em>Nuance</em> operating in spectral range 450-950 nm was adapted for clinical in vivo measurements in diffuse reflectance and fluorescence mode. Mean and standard deviation values of optical density and fluorescence intensity were extracted from segmented pigmented lesions (21 benign and 26 atypical nevi) and used for further analysis. It was possible to achieve 62% sensitivity and 67% specificity for discrimination between atypical and benign lesions using averaged fluorescence mean intensity and standard deviation values.</div> <div></div> <p><a href="http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&amp;arnumber=7304026&amp;url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D7304026">Jakovels, D., Saknite, I., Bliznuks, D., Spigulis, J., &amp; Kadikis, R. (2015, May). Benign—A typical nevi discrimination using diffuse reflectance and fluorescence multispectral imaging system. In <i>2015 International Conference on BioPhotonics (BioPhotonics)</i> (pp. 1-4). IEEE.</a></p> <p><a href="https://makonis.edi.lv/s/myeSE2EidEiz2ef">pdf</a></p>
• 2015

  The influence of thermal hysteresis of a clocked comparator on the operation of the comparator type sampling converter

  KRUMIN'SH, K., PETERSON, V., PLOTSINSH, V.

  Abstract

  <p>KRUMIN'SH, K., PETERSON, V., PLOTSINSH, V., 2015. The influence of thermal hysteresis of a clocked comparator on the operation of the comparator type sampling converter. Automatic Control and Computer Sciences, Volume 49, Issue 4, pp 245-253<br /> Abstract</p> <p>The influence of thermal hysteresis of a clocked comparator on the quality of operation of a comparator type equivalent time sampling converter has been studied. The influence of thermal hysteresis is characterized by the noise and distortion of the converter zero line. The studies are carried out based on physical experiments and computer simulation. For physical experiments clocked comparator, based on tunnel diodes, is used. The up-and-down method is used as a sampling conversion method.</p>
• 2014

  A Method for segment based surface reconstruction from discrete inclination values

  NESENBERGS, K., HERMANIS, A. and GREITANS, M.

  Abstract

  <p>K. Nesenbergs, A. Hermanis, M. Greitans, 2014. A Method for segment based surface reconstruction from discrete inclination values. Elektronika ir Elektrotechnika, 20(2), pp. 32-35.</p> <p>All authors:</p> <p>Krisjanis Nesenbergs, Atis Hermanis, Modris Greitans.</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>
• 2014

  Optimization of adaptive up-and-down method for equivalent time signal conversion

  KRUMINSH, K. and PLOCINSH, V.

  Abstract

  <p>KRUMINSH, K. and PLOCINSH, V., 2014. Optimization of adaptive up-and-down method for equivalent time signal conversion, ICINCO 2014 - Proceedings of the 11th International Conference on Informatics in Control, Automation and Robotics 2014, pp. 597-603.<br /> ABSTRACT</p> <p>This study relates to comparator type equivalent time signal conversion. The influence of parameters of combined adaptive up-and-down method on accuracy of signal conversion is studied. Optimal values of parameters are obtained, using which the minimal amount of the samples is ensured. As an input signal, a model of UWB radar signal (sine monocycle) is used. Method is intended for application in UWB radar receivers. The design guidelines for application of the method in UWB radar receivers are outlined.</p>
• 2014

  Method for wideband signal digitizing and their real-time reconstruction in enlarged dynamic range

  BILINSKIS, I., SUDARS, K. and MIN, M.

  Abstract

  <p>BILINSKIS, I., SUDARS, K. and MIN, M., 2014. Method for wideband signal digitizing and their real-time reconstruction in enlarged dynamic range. Elektronika ir Elektrotechnika, 20(6), pp. 110-113.<br /> ABSTRACT</p> <p>Various approaches to signal digitizing and realtime reconstruction in wide frequency and dynamic ranges are considered. They are discussed and compared on the basis of MATLAB simulation results. It is shown that the best results can be achieved at combination of pseudo-randomized sampling of the original signals at sub-Nyquist rates with low bit-rate pseudo-quantizing of the signal sample values obtained at highfrequency periodic sampling.</p>
• 2014

  Assay of concurrent use of correlation and principal component analysis for tasks of UWB radar

  ARISTOV, V., KRUMINSH, K., PLOTSINSH, V.

  Abstract

  <p>ARISTOV, V., KRUMINSH, K., PLOTSINSH, V., 2014. Assay of concurrent use of correlation and principal component analysis for tasks of UWB radar. Automatic Control and Computer Sciences, 48(5), pp. 296-302.<br /> ABSTRACT</p> <p>The effectiveness of combining correlation of the signal reflected from the object with principal component analysis is investigated, for radar applications—in particular, ultrawide-band (UWB) bioradar systems such as remote contact-free detection and recording of human respiration. Simulation and physical experiments are employed. The signal/noise ratio for which it is advisable to use correlation of signal with reference signal is determined.</p>
• 2014

  An Approach to Enhancing the Design of Analog-to-Event Converters.

  BILINSKIS, I., BOOLE, E., MEZERINS, A.

  Abstract

  <p>BILINSKIS, I., BOOLE, E., MEZERINS, A. 2014.An Approach to Enhancing the Design of Analog-to-Event Converters. Baltic J. Modern Computing, 2 (4), 215-226.</p>
• 2014

  RGB-D-T based face recognition

  NIKISINS, O., NASROLLAHI, K., GREITANS, M. and MOESLUND, T.B.

  Abstract

  <p>NIKISINS, O., NASROLLAHI, K., GREITANS, M. and MOESLUND, T.B., 2014. RGB-D-T based face recognition, Proceedings - International Conference on Pattern Recognition 2014, pp. 1716-1721.</p>
• 2014

  Precise event timing realisation and its application for signal analysing

  BESPALKO, V., BOOLE, E., VEDINS, V.

  Abstract

  <p>BESPALKO, V., BOOLE, E., VEDINS, V., 2014. Precise event timing realisation and its application for signal analysing. Proc. of 14th Biennial Baltic Electronics Conference (BEC2014), Tallinn, Estonia, Oct. 6-8, pp.177 - 180.</p>
• 2014

  High Precision Event Timing Technology and Possibility to Use it in Gravimeters

  BESPAĻKO, V., BOOLE, E., VEDIN, V., OZOLINS, G.

  Abstract

  <p>BESPAĻKO, V., BOOLE, E., VEDIN, V., OZOLINS, G., 2014.High Precision Event Timing Technology and Possibility to Use it in Gravimeters, Proc. of IAG Symposium on Terrestrial Gravimetry, 17 – 20 Sept17 – 20 Saint Petersburg, Russia. State Research Center of the Russian Federation Concern CSRI Elektropribor, JSC, pp. 148- 151</p>
• 2014

  Experimental Studies of Analog Signal Digital Representing Based on a High Performance Event Timer

  MEZERINS, A.

  Abstract

  <p>MEZERINS, A. 2014. Experimental Studies of Analog Signal Digital Representing Based on a High Performance Event Timer. Proceedings of the 14th Biennial Baltic Electronics Conference (BEC2014), Tallinn, Estonia, Oct.6-8<br /> ABSTRACT</p> <p>Experimental studies of analog signal digitizing performed on the basis of precise specific event forming and timing, are discussed. Some suggestions are given how to improve designs of the next converter versions, in particular, how to get information essential for precise signal reconstruction, for instance, the estimates of the reference sine-wave phase angle.</p>
• 2014

  Application of fluorescence spectroscopy and multispectral imaging for non-invasive estimation of GFP transfection efficiency

  TAMOŠIUNAS, M., JAKOVELS, D., ĻIHAČOVS, A., KILIKEVIČUS, A., BALTUŠNIKAS, J., KADIKIS, R., ŠATKAUSKAS, S.

  Abstract

  <p>Electroporation and ultrasound induced sonoporation has been showed to induce plasmid DNA transfection to the mice tibialis cranialis muscle. It offers new prospects for gene therapy and cancer treatment. However, numerous experimental data are still needed to deliver the plausible explanation of the mechanisms governing DNA electro- or sono-transfection, as well as to provide the updates on transfection protocols for transfection efficiency increase. In this study we aimed to apply non-invasive optical diagnostic methods for the real time evaluation of GFP transfection levels at the reduced costs for experimental apparatus and animal consumption. Our experimental set-up allowed monitoring of GFP levels in live mice tibialis cranialis muscle and provided the parameters for DNA transfection efficiency determination.</p> <p><a href="https://www.spiedigitallibrary.org/conference-proceedings-of-spie/9421/94210M/Application-of-fluorescence-spectroscopy-and-multispectral-imaging-for-non-invasive/10.1117/12.2083895.short?SSO=1">Tamošiūnas, M., Jakovels, D., Ļihačovs, A., Kilikevičius, A., Baltušnikas, J., Kadikis, R., &amp; Šatkauskas, S. (2014, October). Application of fluorescence spectroscopy and multispectral imaging for non-invasive estimation of GFP transfection efficiency. In <i>Eighth International Conference on Advanced Optical Materials and Devices (AOMD-8)</i> (Vol. 9421, p. 94210M). International Society for Optics and Photonics.</a></p> <p><a href="https://makonis.edi.lv/s/ie9xmc6Sz2g5poN">pdf</a></p>
• 2014

  Development of 802.11p Testbed - Experiences

  MEDNIS, A.

  Abstract

  <p>MEDNIS, A. 2014. Development of 802.11p Testbed - Experiences. Proceedings of the 14th Biennial Conference on Electronics and Embedded Systems (BEC 2014), pp. 137-140,Tallinn University of Technology.</p>