| Topic title |
Possible scientific supervisors |
Source of funding |
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Efficient signal excitation and processing technologies for ultrasonic measurements and imaging
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prof. dr. Linas SVILAINIS |
state-funded |
Research Topic Summary.
Measurement and imaging resolution demand for reliable signals separation, but limited bandwidth is causing the signals to overlap. Research is aimed to develop the efficient signal excitation and processing techniques for ultrasonic imaging and measurements.
Reliable time of flight and reflection amplitude estimation, imaging resolution and contrast are improved thanks to binary excitation spread spectrum signals application. Overlapping reflections are resolved either by spectroscopic or iterative deconvolution techniques. Correlation sidelobes, signal bandwidth can be optimized/corrected thanks to innovative excitation signals. Excitation is not limited to conventional acoustic sources, but also photoacoustics can be used. Laser ultrasound excitation can use spread spectrum signals which in turn can be adapted to spectral/correlation properties requirements. Reference signals can be made adaptable in order to increase the deconvolution efficiency. New signal quality is obtained thanks to efficient excitation and processing, which in turn enhances the possibilities for imaging and measurements.
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| Electronic System of Ultrapenetrative Disinfection and Probiotics Colonization |
doc. dr. Mindaugas ŽILYS |
state-funded |
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Investigation of topologies of electro-optical modulators and sources of acoustic noises in lasers
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prof. dr. Vytautas MARKEVIČIUS |
state-funded |
Research Topic Summary.
Electro-optical modulators are used in high-power laser systems for beam power regulation. Such devices operate under very difficult conditions - high (>1.5kV) voltage and fast switching (<5nsec) and 1-2MHz repetition rate, which causes high energy consumption of electro-optical modulators. Currently, when the laser is operating at a repetition rate of 1-2MHz, standard Si transistors have to be cooled with water, because about 160W of heat is released. Recently, promising GaN, SiC transistors have appeared, which are faster and have lower resistance, so water cooling is likely to be avoided. However, due to the specifics of GaN, SiC transistors, the electronics of the modulators need to be redesigned. Electro-optical crystals are also characterized by the piezo effect, which creates new control possibilities, but is also a source of noise. Damping of acoustic vibrations in electro-optical modulators can be realized by using the piezo effect of crystals.
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| Energy Efficient Smart City Controllers Networks for Remote Monitoring |
prof. dr. Darius ANDRIUKAITIS |
state-funded |
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Investigation of FPGA technology with integrated communication channels in lasers
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prof. dr. Vytautas MARKEVIČIUS |
state-funded |
Research Topic Summary.
In the development of modern semiconductor devices, ultra-short (femto-second) pulse lasers are widely used in technological production processes. When developing such lasers, it is very relevant to create devices capable of generating control pulses for these lasers with an error of less than 10 psec. One of the possible technologies to realize these functions is FPGA with integrated communication channels (12GHz and more). In the design of femtosecond pulsed lasers, not only the accuracy of the excitation pulses, but also their minimal (<5psec) temporal jitter is very important
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Application of intelligence methods for electrical drives control.
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doc. dr. Gytis PETRAUSKAS |
state-funded |
Research Topic Summary.
With the recent decline in the price of semiconductors, matrix AC-AC drives are gaining popularity worldwide. These actuators are based on a purely semiconductor device, the AC-AC matrix frequency converter. Like conventional AC-DC-AC drives, they are used for speed control of the AC motors in industrial and building engineering applications. One of the structural features of the matrix AC-AC drives is the ability to directly change electrical parameters at the point of connection to the power distribution lines, which would allow them to be used as the reactive power compensators. In addition, with the rise of energy efficient LED light sources, there are problems with capacitive reactive power generated by these sources, which cannot be compensated by conventional compensators. Due to their properties, the matrix AC-AC electric actuators can also be used to compensate the reactive power generated by the LED in addition to the AC motor speed control. Combining these two innovative technologies would bring significant economic and environmental benefits.
The aim of the research is to develop a matrix AC-AC drive control methodology based on intelligent methods that would allow the use of these drives to compensate for the reactive power produced by modern reactive power sources while maintaining their main function as the standard AC motor drive.
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Investigations of parametric imaging and monitoring technologies based on cardiovascular dynamics
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v.m.d. dr. Rytis JURKONIS |
state-funded |
Research Topic Summary.
The cardiovascular system decisively determines the basic functions of tissues and organs and their pathologies. The dynamics of this system is an under-used source of information in the development of imaging and monitoring technologies for early diagnosis, soft tissue characterization, and monitoring of quantitative changes and risks.
The scientific problem is to obtain reliable quantitative diagnostic information about tissue structure and physiology changes using analysis of cardiovascular system dynamics by dedicated recording methods and algorithms.
The aim of the research is to develop innovative biosignal and ultrasonic data streams processing algorithms for monitoring and ultrasonic parametric imaging. The dynamic characteristics of the cardiovascular system - parameters of heart rate and arrhythmias, pulsations of blood vessels and tissues will be investigated in relationship with tissue perfusion and micro-structure changes revealed by ultrasound methods.
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| Development and research of a continuum cobot |
prof. dr. Renaldas URNIEŽIUS |
state-funded |
| Development of non-invasive technologies for prevention of brain functions‘ impairments during surgeries with general anesthesia (cardiac surgery, transplantation of organs and etc.). |
prof. dr. Arminas RAGAUSKAS |
state-funded |
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Ultrasonic measurement and X-ray tomography for non-destructive testing, technical and medical diagnostic methods
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prof. dr. Liudas MAŽEIKA |
state-funded |
Research Topic Summary.
Ultrasonic measurements is one of the technology allowing a relatively higher degree of automation, however, it requires innovative, integrated solutions for the electronics and signal processing, the implementation of which is particularly complicated under operating conditions of high temperature and pressure, or the complicated structure of the objects itself. The research topic covers areas such as:
• ultrasonic imaging methods under extreme conditions;
• ultrasonic transducers for special applications (high temperature, air-coupled);
• Multi-dimensional x-ray and ultrasonic data fusion
• ultrasonic testing methods of composite materials;
• application of ultrasonic guided waves for non-destructive testing of planar and tubular engineering structures;
• ultrasonic monitoring methods of potentially dangerous objects;
• application of ultrasonic waves and X-ray for imaging and measurement of spatial properties of solid and liquid materials;
• ultrasonic measurement and imaging methods in biology and medicine;
• Application of artificial intelligence methods for analysis and classification of ultrasonic diagnostic images
The aim of the proposed work is to create and improve the new measurement, diagnostic and monitoring technologies in industry and medicine for solving the mentioned problems.
The problem-solving tasks include investigation of ultrasonic and X-ray waves in different environments using modelling and experiments, measurement of characteristics and performance of ultrasonic transducers, development of novel measurement
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Application of artificial intelligence methods for analysis of informative regions within ultrasonic NDT and medical diagnostic images
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prof. dr. Renaldas RAIŠUTIS |
state-funded |
Research Topic Summary.
The scientific problem includes the informative analysis of ultrasound signals and diagnostic images and the quantitative interpretation of the results in order to detect internal defects and pathologies. The aim is to develop and investigate the methods of analysis of informative areas in ultrasound non-destructive testing and medical diagnostic images, providing opportunities for quantitative parameter measurement and automated classification of these areas, using artificial intelligence methods.
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