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Vilnius, Lithuania

Vilniaus Gedimino technikos universitetas , also known as VGTU, is a public university in Vilnius, Lithuania. Founded on 1 September 1956, the university was first a Vilnius-based evening division of the Kaunas Polytechnic Institute. It currently has 10 faculties, 14 research institutes, 33 research laboratories, and 2 research and 4 training centers. According to the QS World University Rankings, VGTU is in the top 4 percent of world universities. QS has given VGTU five stars in teaching, facilities, and innovation. Measuring student mobility in the ERASMUS exchange program, VGTU is the most popular university in Lithuania for foreign students. Wikipedia.

Mazeika D.,Vilnius Gediminas Technical University | Vasiljev P.,Lithuanian University of Educational Sciences
Mechanical Systems and Signal Processing

Investigation of a novel design tiny piezoelectric inertial motor is given in the paper. Operation principle of the motor is based on inertial motion of the slider applying sticks and slip phases between stator and slider. Piezoelectric motor has simple design and consists of the slider with a bimorph piezoceramic disc and the clamped cylindrical shaft used for sliding. The advantage of the motor design is the self-moving slider that obtains bidirectional inertial motion when the saw tooth or the pulse type excitation signal is applied at resonant frequency. Numerical investigation of the piezoelectric motor based on finite elements method was performed to analyse natural frequencies, modal shapes of the motor and slider response to the different excitation regimes. The influence of the Coulomb friction on the velocity of the slider is analysed. A prototype inertial piezoelectric motor was built, and measurements of electrical and mechanical characteristics were performed. The results of numerical and experimental study are discussed. © 2011 Elsevier Ltd. All rights reserved. Source

Ratkeviciute K.,Vilnius Gediminas Technical University
Baltic Journal of Road and Bridge Engineering

This article gives the summary of the author's PhD Thesis supervised by Prof Dr Donatas Čygas and defended on 16 December 2009 at the Vilnius Gediminas Technical University. The thesis is written in Lithuanian and is available from the author upon request. Chapter 1 gives the main data on the road network of national significance of Lithuania, the change in the level of vehicle ownership, the basic accident indices and the essential factors influencing road safety. Chapter 2 gives a review of research methods used, review and evaluation of methodologies for the substantiation of road safety measures in Lithuania, Finland, Belarus, Poland and Sweden. Chapter 3 gives the evaluation of the effect of road safety measures implemented on the roads of Lithuania in 1999-2002. Chapter 4 describes the improved model for the substantiation of road safety measures under Lithuanian conditions. Chapter 5 presents the use of mathematical models for the forecasting of road accidents on the main roads of the Republic of Lithuania. Source

Jukneviciute-Zilinskiene L.,Vilnius Gediminas Technical University
Baltic Journal of Road and Bridge Engineering

This summary of the author's PhD thesis supervised by Prof Dr Alfredas Laurinavičius and defended on 16 December 2009 at the Vilnius Gediminas Technical University. The thesis is written in Lithuanian and is available from the author upon request. Chapter 1 gives the analysis of researches carried out by the scientists - developers of the science of climatology related to climate and its change and climatic regioning. The climate of Lithuania is described and the effect of climatic factors on road construction. Chapter 2 presents the analysis of climatic regioning methods, studies the climatic factors having the largest effect on road design, construction, repair and maintenance. Chapter 3 makes the analysis, evaluation and comparison of multi-year data of the Lithuanian Hydrometeorological Service (1961-1990) and the Road Weather Information System (1999-2008). Chapter 4 presents examples of the subject maps made of the basis of RWIS data which is useful and informative for the users, especially for the road organizations and services. The regioning possibilities are evaluated from the point of view of road construction. © Vilnius Gediminas Technical University, 2010. Source

Ginevicius R.,Vilnius Gediminas Technical University
International Journal of Information Technology and Decision Making

The accuracy of the results obtained by using multicriteria evaluation methods largely depends on the determination of the criteria weights. The accuracy of expert evaluation decreases with the increase of the number of criteria. The application of the analytic hierarchy process, based on pairwise comparison of the criteria, or similar methods, may help to solve this problem. However, if the number of the pairs of criteria is large, the same problems, associated with the accuracy of evaluation, arise. In the present paper, a new method of determining the criteria weights, FARE (Factor Relationship), based on the relationships between all the criteria describing the phenomenon considered, is offered. It means that, at the first stage, a minimal amount of the initial data about the relationships between a part of the set of criteria, as well as their strength and direction, is elicited from experts. Then, based on the conditions of functioning and the specific features of the complete set of criteria, the relations between other criteria of the set and their direction are determined analytically in compliance with those established at the first stage. When the total impact of each particular criterion on other criteria of the set or its total dependence on other criteria of a particular set is known, the criteria weights can be determined. © 2011 World Scientific Publishing Company. Source

Zavadskas E.K.,Vilnius Gediminas Technical University
Automation in Construction

An overview of the results of the 25th anniversary International Symposium on Automation and Robotics in Construction (ISARC-2008), held for first time in Lithuania, is presented in this article. Also, for the first time, the Symposium was organized in joint with the International Council for Research and Innovation in Building and Construction (CIB). This article is a survey of the plenary session presentations. Further it surveys the articles in the now-published Special Issue based on the proceedings papers from ISARC-2008 as well as the ones published in different scientific journals. © 2009 Elsevier B.V. All rights reserved. Source

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