Publications

729 publications

• 2010

  Data Acquisition Based on Nonuniform Sampling

  K.Sudars

  Abstract

  <p>K.Sudars. Data Acquisition Based on Nonuniform Sampling: Achievable Advantages and Involved Problems, Automatic Control and Computer Science, 2010, Vol. 44, No. 4, pp. 199-207.<br /> Abstract<br /> Application potential of a non-traditional approach to data acquisition from sources of continuous in time analog sensor signals is considered and discussed in this paper. It is shown that using nonuniform sampling at digitizing such signals and appropriate algorithms for processing them open up a possibility of obtaining a number of practically valuable benefits. However this approach requires also more complicated processing of the acquired data at reconstructing the original waveforms. Problems of this kind are discussed and ways how to resolve them are suggested.</p> <p><a href="http://springerlink3.metapress.com/content/h670105743526277/fulltext.pdf" target="_blank" rel="noopener noreferrer">Pdf</a></p>
• 2010

  Mathematical abstractions and practical realization of the “up-and-down” method

  K. Kruminsh, A. Lorencs and V. Plocinjsh

  Abstract

  <p>K. Kruminsh, A. Lorencs and V. Plocinjsh. Mathematical abstractions and practical realization of the “up-and-down” method. Automatic Control and Computer Sciences, 2010, Vol. 44, No. 4, pp. 191-198.<br /> By analytical calculations and statistical modeling, the root-mean-square deviation of the result of discrete stroboscopic noise transformation is investigated with the up-and-down method at the relatively large range steps of the method. Analytical investigations are fulfilled at symmetric (equally up and down) steps, and statistical modeling is fulfilled at symmetric and asymmetric steps of the up-and-down and modified up-and-down method.</p> <p><a href="http://www.springerlink.com/content/7u8015006912j740/fulltext.pdf" target="_blank" rel="noopener noreferrer">Pdf</a></p>
• 2010

  SAntArray: passive element array antenna for wireless sensor networks

  K.Prieditis, I.Drikis and L.Selavo

  Abstract

  <p>K.Prieditis, I.Drikis and L.Selavo. SAntArray: passive element array antenna for wireless sensor networks. In Proc. of the 8th ACM Conference on Embedded Networked Sensor Systems SenSys '10, ACM, New York, NY, USA, 2010, pp. 433-434.</p>
• 2010

  Precise Events Timing Based on Digital Processing Of The Response Of A Harmonic Oscillator

  A.S.Rybakov, V.Yu.Vedin

  Abstract

  <p>A.S.Rybakov, V.Yu.Vedin. Precise Events Timing Based on Digital Processing Of The Response Of A Harmonic Oscillator. Automatic Control and Computer Sciences, 2010, Vol. 44, No. 6, pp. 337-346.</p>
• 2010

  LynxNet: Wild Animal Monitoring Using Sensor Networks

  R. Zviedris, A. Elsts, G. Strazdins, A. Mednis and L. Selavo

  Abstract

  <p>R. Zviedris, A. Elsts, G. Strazdins, A. Mednis and L. Selavo. LynxNet: Wild Animal Monitoring Using Sensor Networks. Proceedings of REALWSN 2010, Lecture Notes in Computer Science, 2010, Vol. 6511, 2010, pp. 170-173.<br /> Abstract</p> <p>Monitoring wild animals, especially those that are becoming endangered (for example, lynxes and wolves) is important for biology researchers. Solutions for the monitoring already exist; however, they all have drawbacks, such as limited range or lifetime, sensing modality, reporting delays, unreliability of operation. In this work we describe our experiences in designing an improved animal monitoring sensor system and low-level software for sensor node control and communication. The target animals for this particular research are wild lynxes or canines, however it can be extended to other animal species. The LynxNet system is based on tracking collars, built around TMote Mini sensor nodes, sensors, GPS and 433MHz radio, and stationary base stations, placed at the locations that are frequented by the animals. We present preliminary field results of our radio communication range tests.</p> <p><a href="http://strazdins.lv/papers/zviedris2010lynxnet.pdf" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Study of Ultra–Wideband Pulse Shapers

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

  Abstract

  <p>M.Greitans, V.N. Aristov, E.Hermanis. Study of Ultra–Wideband Pulse Shapers. Automatic Control and Computer Sciences, 2010, Vol. 44, No. 6, pp. 331–337.</p>
• 2010

  MEDiSN: Medical emergency detection in sensor networks

  J.Ko, J.H.Lim, Y.Chen, R.Musvaloiu-E, A.Terzis, G.M.Masson, T.Gao, W.Destler, L.Selavo, R.P.Dutton

  Abstract

  <p>J.Ko, J.H.Lim, Y.Chen, R.Musvaloiu-E, A.Terzis, G.M.Masson, T.Gao, W.Destler, L.Selavo, R.P.Dutton. MEDiSN: Medical emergency detection in sensor networks. ACM Transactions on Embedded Computing Systems, Vol.10, Issue 1, 2010, pp. 1-29.</p>
• 2010

  Optimization of the Equilibration Algorithm for a Sampling Converter

  V.Karklinsh

  Abstract

  <p>V.Karklinsh. Optimization of the Equilibration Algorithm for a Sampling Converter. Automatic Control and Computer Sciences, 2010, Vol. 44, No. 6, pp. 347-353.</p>
• 2010

  Datoru arhitektūra un organizācija

  A.Baums

  Abstract

  <p>A.Baums. Datoru arhitektūra un organizācija. Rīga: Tipogrāfija “VEITERS KORPORĀCIJA”, 2010, 236 lpp.</p>
• 2010

  Objekta izsekošana Bezvadu Sensoru Tīklos: pārskats

  G.Miezitis, R.Taranovs

  Abstract

  <p>G.Miezitis, R.Taranovs, Objekta izsekošana Bezvadu Sensoru Tīklos: pārskats. RTU zinātniskie raksti. 5. sēr., Datorzinātne. - 42. sēj. (2010), 45.-52. lpp.</p>
• 2010

  Galvenie videokonferenču kvalitātes ierobežojumi lokālo tīklu bāzē

  R.Taranovs, K.Vilde, A.Eriņš, V. Zagurskis

  Abstract

  <p>R.Taranovs, K.Vilde, A.Eriņš, V. Zagurskis. Galvenie videokonferenču kvalitātes ierobežojumi lokālo tīklu bāzē. RTU zinātniskie raksti. 5. sēr., Datorzinātne. - 42. sēj. (2010), 38.-44. lpp.</p>
• 2010

  Heterogeneous Collision-Free Clustered Scheme for Wireless Sensor Networks

  R.Taranovs, V.Zagursky and A.Morozovs

  Abstract

  <p>R.Taranovs, V.Zagursky and A.Morozovs. Heterogeneous Collision-Free Clustered Scheme for Wireless Sensor Networks. 2010 IEEE 26th Convention of Electrical and Electronics Engineers in Israel IEEEI, Nov. 2010, pp. 282-285.</p>
• 2010

  EdiMote: A Flexible Sensor Node Prototyping and Profiling Tool

  R.Ruskuls, L.Selavo

  Abstract

  <p>R.Ruskuls, L.Selavo. EdiMote: A Flexible Sensor Node Prototyping and Profiling Tool. Proceedings of REALWSN 2010, Lecture Notes in Computer Science, Vol. 6511, 2010, pp. 194-197.</p>
• 2010

  Location Based Information Storage and Dissemination in Vehicular Ad Hoc Networks

  G. Strazdins

  Abstract

  <p>G. Strazdins. Location Based Information Storage and Dissemination in Vehicular Ad Hoc Networks. In Advances in Databases and Information Systems: Proceedings of associated Workshops and Doctoral Consortium of the 13th East European Conference (ADBIS 2009), LNCS 5968, pp. 211–219, 2010.<br /> Abstract</p> <p>Vehicular Ad Hoc Networks (VANETs) is an emerging type of information networks in urban areas. A lot of research has been done in the area of increasing the vehicle awareness by disseminating collision and congestion warnings, and parking place availability information. In this paper we propose a novel idea and framework for dissemination of location based information, called digital maps, which are useful not only directly for the drivers and vehicle onboard navigation systems, but also external entities, such as tourists, environmental scientists, emergency services, advertisement companies. Centralized authority defines cooperative knowledge collection tasks and disseminates orders in the network while every vehicle decides which tasks it takes part of, based on hardware equipment, geographical position and individual interests of the driver. The results of preliminary simulation, with vehicles driving in an artificial city, show, that 200 vehicles/km2 is minimum reasonable density to deploy proposed dissemination system.</p> <p><a href="http://strazdins.lv/papers/strazdins2009adbis.pdf" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Morphology-Based Approach to Detection of Free Form Line Objects in Grayscale Images

  I.Mednieks

  Abstract

  <p>I.Mednieks. Morphology-Based Approach to Detection of Free Form Line Objects in Grayscale Images. Electronics and Electrical Engineering - Kaunas: Technologija, 2010, No. 8(104), pp. 27-30.</p>
• 2010

  One method of image processing and its numerical analysis

  A. Lorencs, J. Sinica-Sinavskis

  Abstract

  <p>A. Lorencs, J. Sinica-Sinavskis. One method of image processing and its numerical analysis. Electronics and Electrical Engineering. Kaunas; Technologija, 2010. No.7 (103), pp.25-29.<br /> The paper discusses application of linear regression models to image transformation and pattern recognition, oriented towards creation of technology for fast processing of digital images. Theoretical and heuristic expectations are confronted with results of numerical analysis. Digital images are considered to be sets of samples taken from the surface of brightness levels. Adequate regression models, i.e. analytic expressions of functions for representation of these surfaces are sought. Images are represented by vectors of 30 coefficients of the model calculated using the least squares method. Classification of images further is based on classification results of coefficient vectors of linear regression models.</p> <p><a href="http://www.ee.ktu.lt/journal/2010/7/06__ISSN_1392-1215_One%20Method%20of%20Image%20Processing%20and%20its%20Numerical%20Analysis.pdf" target="_blank" rel="noopener noreferrer">Pdf</a></p>
• 2010

  Multidimensional Observation Plans Inducing Nondegeneracy of Information Matrixes of Regression Models

  A.A.Lorencs

  Abstract

  <p>A.A.Lorencs. Multidimensional Observation Plans Inducing Nondegeneracy of Information Matrixes of Regression Models. Automatic Control and Computer Sciences, 2010, Vol.44, No.2, pp.69-77.<br /> Abstract<br /> Linear regression models for the response, which depends on several controlled variables, are considered. The method of constructing such a plan of observations that provides the nondegeneracy of the information matrix of the regression model is substantiated.</p> <p><a href="http://springerlink.com/content/07p12r7616l04183/fulltext.pdf" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  Analytic Model and Bilateral Approximation for Clocked Comparator

  Modris Greitans, Evalds Hermanis, Gatis Supols

  Abstract

  <p>Modris Greitans, Evalds Hermanis, Gatis Supols. “Analytic Model and Bilateral Approximation for Clocked Comparator”, 7th IEEE International Conference on Signals and Electronic Systems - ICSES 2010, Glivice, Polija, 7-10. September 2010.g. pp.185-188.<br /> Abstract<br /> The paper discusses a model of clocked comparators, the dynamic characteristics of which are described by differential equations. In the model as an argument is used not time, but the phase difference between two signals, thereby the law of causal relationship may not apply. The paper demonstrates an example of the analytic solution of simplified model represented by first order differential equation with variable coefficient. More refined models give higher-order differential equations, which not always need to be solved analytically. As an alternative an approximate bilateral solution of differential equations is introduced. Experimental results demonstrate the transition characteristic of clocked comparator, where decision stage is built on two bipolar transistors.</p> <p><a href="http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5595218" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2010

  MansOS: Easy toUse, Portable and Resource Efficient Operating System for Networked Embedded Devices

  G. Strazdins, A. Elsts and L. Selavo

  Abstract

  <p>G. Strazdins, A. Elsts and L. Selavo. MansOS: Easy toUse, Portable and Resource Efficient Operating System for Networked Embedded Devices. Proc. of the 8th ACM Conference on Embedded Networked Sensor Systems SenSys '10, ACM, New York, NY, USA, 2010, pp. 427-428.</p> <p>Abstract</p> <p>Often software for wireless sensor networks (WSNs) is developed using a specific event based operating system (OS) such as TinyOS. However, this requires steep learning curve for the new developers. Other operating systems for embedded devices have limited support for new hardware platforms. Our goal is to provide an operating system for resource constrained devices that is easy to use for the wide range of researchers and developers familiar with C programming language and Unix operating system concepts. In addition, we provide a framework for agile portability to new hardware platforms, due to the nature of WSN systems that require specific hardware or features for the sensing tasks at hand. We propose Multiple agent netted sensor Operating System (MansOS), that demonstrates ability to execute the same application on different platforms including x86 CPU based computers for easy simulation and debugging of a single node or a whole network. The new platforms are easily added to MansOS thanks to the well defined abstraction layers. MansOS is being successfully used in real world applications, such as wild animal tracking and environmental monitoring in a fruit care research garden. It has also been used in academic environment for teaching wireless sensor networks.</p> <p><a href="http://strazdins.lv/papers/strazdins2010mansos.pdf" target="_blank" rel="noopener noreferrer">pdf</a></p>
• 2009

  Statistical Method of Signal – Noise Ratio Maximization

  V.Plociņš

  Abstract

  <p>V.Plociņš. “Statistical Method of Signal – Noise Ratio Maximization”, “Electronics and Electrical Engineering” - Kaunas: Technologija, 2009, No.6(94), pp. 3-8.</p>