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The list of national projects SAS

Institute of Measurement Science

EEG data analysis by blind source separation methods

Analýza EEG signálu pomocou metód hľadania skrytých zdrojov

Duration: 1.9.2024 - 31.8.2026
Program:
Project leader: Mgr. Rošťáková Zuzana PhD.
Annotation:Blind source separation (BSS) approaches are unsupervised machine learning methods focused on the detection of hidden, directly unobservable (latent) structure of real-world data. They play a crucial role in image processing, medical imaging, and music. The proposed project focuses mainly on human electroencephalogram (EEG), for which BSS is beneficial when detecting the narrowband brain oscillations representing brain processes either in health or disease. Two-dimensional BSS methods like principal or independent component analysis are easily applicable and understandable for a broader medical and neurophysiological community. However, the estimated latent component properties are usually incompatible with the real electrophysiological signal character. Consequently, they miss their neurophysiological interpretation. Tensor decomposition is a complex but more flexible mathematical procedure that allows adapting the model structure and constraints to the solution to mimic real-world signal characteristics. The proposed project focuses on tensor decomposition as a tool for i) EEG preprocessing, artefact detection and removal, ii) EEG latent structure analysis using a nonnegative tensor decomposition with block structure allowing to model various relationships between latent components, and iii) post-decomposition analysis of latent component dynamic properties. Obtaining comprehensive information about EEG latent structure and developing novel, user-friendly algorithms is crucial for better understanding brain processes and new methods for treating neurophysiological diseases and disorders.

Automatic data evaluation tool from the longitudinal quantitative MRI studies of articular cartilage

Automatický softvérový nástroj na výhodnocovanie kvantitatívnych MRI štúdií artikulárných chrupaviek v čase

Duration: 1.7.2022 - 30.6.2026
Program: SRDA
Project leader: Ing. Dr. Szomolányi Pavol (PhD.)
Annotation:The aim of the project is to design a comprehensive tool for automatic evaluation of human articular cartilage data from quantitative MRI. Data obtained from the Osteoarthritis Initiative database, and measured at Institute of Measurement Science and Medical University of Vienna will be segmented using an automated segmentation tool based on convolutional neural networks. The annotated data will then be registered on quantitative MRI data that will be available from the database (T2 and T1rho mapping, gagCEST, sodium MR) using automated or semiautomated tools developed within this project. The data obtained will be evaluated at multiple time points according to MR measurements that will be available. In addition to quantitative MR data, this will include volumetric data, cartilage thickness, and texture analysis of quantitative maps. Patient evaluation will be based on risk factor groups (transverse ligament rupture, meniscus rupture and menisectomy). The expected number of patients is approximately 4000 divided into individual groups in the ratio 40/30/30. The output of the project will be a compiled version of an automatic cartilage evaluation tool that will be available in a public source (such as website of Institute of Measurement).

Trustworthy human–robot and therapist–patient interaction in virtual reality

Dôveryhodná interakcia človek–robot a terapeut–pacient vo virtuálnej realite

Duration: 1.7.2022 - 30.6.2026
Program: SRDA
Project leader: Ing. Mgr. Rosipal Roman DrSc.
Annotation:We aim to study specific forms of social interaction using state-of-the-art technology - virtual reality (VR) which is motivated by its known benefits. The project has two main parts, human–robot interaction (HRI) and therapist– patient interaction (TPI). The interactions are enabled using head-mounted displays and controllers allowing the human to act in VR. We propose two research avenues going beyond the state-of-the-art in respective contexts. In HRI, we will develop scenarios allowing the humanoid robot to learn, understand and imitate human motor actions using flexible feedback. Next, we develop scenarios for testing and validating human trust in robot behavior based on multimodal signals. We will also investigate physical interaction with a humanoid robot NICO. In TPI with stroke patients, we develop a series of VR-based occupational therapy procedures for motor and cognitive impairment neurorehabilitation using an active and passive brain-computer interface, and we will validate these procedures. We expect observations from HRI experiments to be exploited in TPI. The proposed project is highly multidisciplinary, combining knowledge and research methods from psychology, social cognition, robotics, machine learning and neuroscience. We expect to identify features and mechanisms leading to trustworthy processes with a human in the loop, as a precondition of success, be it a collaborative task or treatment in VR.

Efficient computation methods for nanoscale material characterization

Efektívne výpočtové metódy pre charakterizáciu materiálov v nano mierke

Duration: 1.7.2022 - 30.6.2025
Program: SRDA
Project leader: Doc. RNDr. Witkovský Viktor CSc.
Annotation:The aim of the project is to design and implement effective calculation methods for evaluating the results of measuring the mechanical properties of materials at the nanoscale using instrumented indentation methods (IIT) and atomic force microscopy (AFM). Both of these methods are able to provide highly localized information on the mechanical properties of the material, such as Young's modulus of elasticity (both methods), hardness (IIT method), or point-to-surface adhesion (AFM method). The principle is the analysis of the recording of the position of the measuring tip and the force interaction between the tip and the sample surface. The determination of the resulting values on the basis of data recorded by the instrument in both of these methods is based on non-trivial mathematical-statistical methods and calculation procedures working with data subjected to relatively high uncertainty or random noise, where it is also necessary to quantify the uncertainty of the measurement result. Both of these methods work with data of a similar nature, but each has certain specifics. The results obtained for IIT can thus serve as a reference for AFM. The project partners are the Czech Metrology Ins titute (CMI is the national metrology institute of the Czech Republic with top infrastructure in the field), the Institute of Measurement Science SAS (IMS SAS), and the Mathematical Institute SAS (MI SAS), which are academic institutions with extensive experience in basic research and applications of mathematics statistics in the field of measurement and metrology. This combination of partners brings a natural synergy and a combination of the necessary competencies for this

Identification of stress-induced alterations in expression of NRF2 target genes in rat models of prehypertension: the effect of comorbid hypertriglyceridemia and dimethyl fumarate treatment

Identifikácia stresom vyvolaných zmien v expresii cieľových génov NRF2 v potkaních modeloch prehypertenzie: vplyv komorbidnej hypertriglyceridémie a liečby dimetylfumarátom

Duration: 1.7.2023 - 30.6.2027
Program: SRDA
Project leader: Ing. Maňka Ján CSc.
Annotation:The nuclear transcription factor erythroid 2-related factor 2 (NRF2) is a key molecular link between several non- communicable diseases, as it regulates the expression of approximately 250 target genes, including those involved in maintenance of redox balance, the development of metabolic disorders, cardiovascular and liver diseases, as well as in immune responses. Borderline elevated blood pressure (prehypertension) is a common cardiovascular disorder in humans, and elevated blood pressure has been found to be positively correlated with triglyceride levels. In addition, chronic stress is an etiological factor in the development of non-communicable diseases, including elevated blood pressure and hypertriglyceridemia (HTG). In experimental studies, borderline hypertensive rats (BHR) and hypertriglyceridemic rats (HTGR) are suitable models of prehypertension without and with comorbid hypertriglyceridemia. These models are relevant for investigating the effects of stress as well as for investigating the role of changes in expression of NRF2 target genes in the development of hypertension associated with metabolic diseases. To understand better the role of NFR2 as well as the impact of chronic social stress on the mentioned diseased states, the aims of this project are: 1) to identify differences in expression of NRF2 target genes in two experimental models of prehypertension - without (in BHR) and with (in HTGR) comorbid HTG - in control conditions and during chronic social stress, 2) to determine if NRF2 activator dimethyl fumarate can reduce stress-induced pathologies in prehypertensive rats, especially in those with comorbid HTG, and 3) to specify a set of suitable whole blood RNA biomarkers for evaluation of changes in NRF2 target genes in prehypertension and HTG and those genes altered by chronic social stress.

Smart deep brain stimulation as a treatment strategy in treatment-resistant depression

Inteligentná hĺbková mozgová stimulácia ako inovatívna stratégia pre liečbu mozgových porúch

Duration: 1.1.2022 - 31.12.2025
Program: VEGA
Project leader: Ing. Mgr. Rosipal Roman DrSc.
Annotation:Impaired connectivity between different brain areas underlines the pathophysiology of multiple brain disorders. It is possible that impaired connectivity between the prefrontal cortex and ventral pallidum is involved in depression. Smart deep brain simulation, combining real-time detection of the neuronal activity in the prefrontal cortex with the stimulation of the ventral tegmental area might be thus effective in depression. We aim to examine the cortico-tegmental connectivity and to test the antidepressant-like effectiveness of the smart deep brain stimulation in an animal model of depression.

Causal analysis of measured signals and time series

Kauzálna analýza nameraných signálov a časových radov

Duration: 1.1.2022 - 31.12.2025
Program: VEGA
Project leader: RNDr. Krakovská Anna CSc.
Annotation:The project is focused on the causal analysis of measured time series and signals. It builds on the previous results of the team, concerning the generalization of the Granger test and the design of new tests in the reconstructed state spaces. The aim of the project is the development of new methods for bivariate and multidimensional causal analysis. We will see the investigated time series and signals as one-dimensional manifestations of complex systems or subsystems. We will also extend the detection of causality to multivariate cases - dynamic networks with nodes characterized by time series. Such complex networks are common in the real world. Biomedical applications are among the best known. Brain activity, determined by multichannel electroencephalographic signals, is a crucial example. We want to help show that causality research is currently at a stage that allows for ambitious goals in the study of effective connectivity (i.e., directed interactions, not structural or functional links) in the brain.

Design of a Methodology and its Verification for the Measurement of Selected Parameters of Ti Implants in the Manufacturing Process

Návrh metodiky a jej overenie pre meranie vybraných parametrov Ti implantátov vo výrobnom procese

Duration: 1.7.2023 - 30.6.2027
Program: SRDA
Project leader: RNDr. Hain Miroslav PhD.
Annotation:The project focuses on the development and application of measurement and non-destructive testing methods in the manufacturing of titanium dental implants. Dental implants are medical devices that have to comply with the technical requirements given by regulation of the European Parliament and Council EU 2017/745 from 5 Apr 2017. Under this regulation, among other obligations, the manufacturer must ensure that these devices are safe and effective and do not compromise the clinical condition or patients safety. The dental implants should also meet a high level of health and safety protection, taking into account the generally accepted state of the art in science and technology. In this project we will address the requirements related to the design and manufacturing and in particular: the compatibility of the different parts of the device, the influence of processes on the properti es of the materials, the mechanical properties of the materials used such as strength, ductility, resistance to wear and fatigue, the properties of the surfaces, and confirmation that the device meets all defined physical specifications as well as the identification of contaminants in the manufacturing process. To ensure these requirements, we intend to use state-of-the-art measurement methods such as X-ray microtomography (microCT), scanning electron microscopy (SEM), optical measurement of surface roughness, SQUID magnetometry. Since the above measurement methods are time consuming and do not allow their full application in the production, the solution will also include the design of effective methods of statistical quality control, which will be applied at the manufacturer of dental titanium implants MARTIKAN, s.r.o. The objectives of the proposed project correlate with the Research and Innovation Strategy for Smart Specialisation of the Slovak Republic 2021-2027 (SK RIS3 2021+), while they affect two defined domains, namely Innovative Industry for the 21st Century and Healthy Society.

Optimization and Standardization of Quantitative Magnetic Resonance Imaging Methods. Suppression of Metallic Artifacts on low-field MR Scanners

Optimalizácia a štandardizácia kvantitatívnych metód zobrazovania magnetickou rezonanciou. Potlačenie kovových artefaktov na nízkopolových MR skeneroch

Duration: 1.9.2024 - 31.8.2026
Program:
Project leader: Ing. Gogola Daniel PhD.

Collaborative BCI post-stroke neurorehabilitation using a patient-therapist interactive VR environment

Pacient-terapeut kolaboratívna BCI-VR neurorehabilitácia po cievnej mozgovej príhode

Duration: 1.9.2024 - 31.8.2026
Program:
Project leader: Ing. Mgr. Rosipal Roman DrSc.
Annotation:A growing body of evidence suggests that integrated brain-computer interface (BCI) technologies and virtual reality (VR) environments provide a flexible platform for a range of neurorehabilitation therapies, including significant motor recovery and cognitive-behavioral therapy following stroke. When a subject is immersed in such an environment, their perceptual level of social interaction is often impaired due to a suboptimal interface quality that lacks the social aspect of human interactions. The project proposes a user-friendly intelligent BCI system with a suitable VR environment in which both patient and therapist interact through their person-specific avatar representations. On the one hand, the patient voluntarily and at his/her own pace controls his/her activity in the environment and interacts with the therapist through a BCI-driven mental imagery process. On the other hand, the therapist's unrestricted motor and communication skills allow for full control of the environment. Thus, the VR environment can be flexibly modified by the therapist, allowing for the creation and selection of different occupational therapy scenarios according to the patient's recovery needs, mental states, and immediate reactions.

Advanced diagnostics of neurodegenerative disorders using magnetic resonance techniques and artificial intelligence

Pokročilá diagnostika neurodegenerat ívnych ochorení pomocou techník magnetickej rezonancie a umelej inteligencie

Duration: 1.7.2023 - 30.6.2027
Program: SRDA
Project leader: Ing. Gogola Daniel PhD.
Annotation:Neurodegenerative diseases (ND) are becoming a severe problem in developed countries. Since we currently have no effective therapies available, early diagnosis is critical to ensure a good quality of life for ND patients. ND are characterized by iron accumulation and magnetite mineralization in brain tissue, with ferritin as a precursor. Due to its low relaxivity, physiological ferritin is at the edge of visibility using magnetic resonance imaging (MRI) techniques. On the contrary, "pathological" ferritin causes a significant shortening of MRI relaxation times. This creates hypointense artifacts, which theoretically allow the distinguishability of both proteins. Since iron accumulation precedes the clinical symptoms of the disease, MRI has the potential to become a non -invasive diagnostic method for the early stages of ND. At present, however, this is limited by the insufficient characterization of the relaxation properties of biogenic iron and the uncertainty in the interpretation of clinical data. Therefore, our basic goal (application output) is the development of a comprehensive methodology (FERINO software tool) for the unequivocal diagnosis of the early stages of ND. To reach our goal, we will use a combination of several diagnostic techniques and artificial intelligence tools. The diagnostic techniques include in-vitro, in-silico, and in-vivo characteristics of ferritin relaxation, structural MRI, magnetic resonance spectroscopy (MRS), neurological tests, and clinical biochemistry biomarkers. The cornerstone of the methodology will be the FerroQuant software tool, which was proposed by the principal investigator within the APVV 2012. It enables the analysis and quantification of iron-related clinical MRI data but lacks new findings in iron MRI (false-positive artifacts, ferritin's mineral phases). FerroQuant also does not use artificial intelligence and does not combine different diagnostic data, whic h, however, will be an integral part of the FERINO tool.

Advanced mathematical and statistical methods for measurement and metrology

Pokročilé matematické a štatistické metódy pre meranie a metrológiu

Duration: 1.7.2022 - 31.12.2025
Program: SRDA
Project leader: Doc. RNDr. Witkovský Viktor CSc.
Annotation:Mathematical models and statistical methods for analysing measurement data, including the correct determination of measurement uncertainty, are key to expressing the reliability of measurements, which is a prerequisite for progress in science, industry, health, the environment and society in general. The aim of the project is to build on traditional metrological approaches and develop new alternative mathematical and statistical methods for modelling and analysing measurement data for technical and biomedical applications. The originality of the project lies in the application of modern mathematical methods for modelling and detecting dependence and causality, as well as statistical models, methods and algorithms for determining measurement uncertainty using advanced probabilistic and computational methods based on the use of the characteristic function approach (CFA). In contrast to traditional approximation and simulation methods, the proposed methods allow working with complex and at the same time accurate probabilistic measurement models and analytical methods. Particular emphasis is placed on stochastic methods for combining information from different independent sources, on modelling dependence and causality in dynamic processes, on accurate methods for determining the probability distribution of values that can be reasonably attributed to the measured quantity based on a combination of measurement results and expert knowledge, and on the development of methods for comparative calibration, including the probabilistic representation of measurement results with a calibrated instrument. An important part of the project is the development of advanced numerical methods and efficient algorithms for calculating complex probability distributions by combining and inverting characteristic functions. These methods are widely applicable in various fields of measurement and metrology. In this project they are applied to the calibration of temperature and pressure sensors.

Determination of Iron in blood and tissues of laboratory animals using SQUID magnetometer.

Stanovenie množstva železa v krvi a tkanivách laboratórnych zvierat pomocou SQUID magnetometra

Duration: 1.9.2024 - 31.8.2026
Program:
Project leader: Mgr. Škrátek Martin PhD.
Annotation:Iron is an essential chemical element that is part of many metabolic processes. However, the amount of iron in the body must be balanced, as its excess or deficiency can lead to serious health conditions. Iron is found in the body in ferritin, hemoglobin or transferrin proteins. Deoxyhemoglobin, methemoglobin, and myoglobin are known to exhibit paramagnetism, which originates from the Fe2+ Fe3+ ions embedded in their molecules. Ferritin, as an iron storage protein, contains Fe atoms mineralized in the form of oxyhydroxide nanoparticles, whose behavior is superparamagnetic. SQUID magnetometry offers the possibility of detecting and quantifying different forms of iron with high sensitivity and could be more useful than other established methods (colorimetric, spectrophotometric, histochemical or atomic absorption spectrometry) in determining the amount of iron in small samples.

Theoretical properties and applications of special families of probability distributions

Teoretické vlastnosti a aplikácie špeciálnych tried rozdelení pravdepodobnosti

Duration: 1.1.2024 - 31.12.2027
Program: VEGA
Project leader: Doc. RNDr. Witkovský Viktor CSc.
Annotation:In the project, problems related to probability distributions and their applications in mathematical modeling will be studied. We will analyze some classes of distributions (distributions generated by partial summations, the Schröter family) and study properties of distributions belonging to these classes. Issues related to calibration regression models will be addressed. New methods for solving multivariate statistical problems will be developed. These methods will be based on the calculation of exact probability distributions using the inverse transformation of the characteristic function of the distribution of the output variable. Entropy, another property of probability distributions, plays an important role in detecting causality in time series. The primary area of application is the use of the distribution of test statistics in hypothesis testing. The new results obtained during the solution of the project will also be applied to mathematical modeling in metrology, linguistics and actuarial mathematics.

Research of reference standards and measurement methods ensuring determination of the relationship of geometric specifications and qualitative indicators of 3D objects created by additive technologies

Výskum referenčného etalónu a meracích metód zabezpečujúcich určenie vzťahu geometrických špecifikácií a kvalitatívnych ukazovateľov 3D objektov vytvorených aditívnymi technológiami

Duration: 1.7.2024 - 31.12.2027
Program: SRDA
Project leader: RNDr. Hain Miroslav PhD.
Annotation:The present project is aimed at evaluating the quality of additive manufacturing, a reference test artefact designed and developed for this purpose. The development of the reference artefact and the quantification of its parameters will make use of the latest knowledge in additive manufacturing, state-of-the-art measurement strategies implemented using X-ray microtomography, magnetometry, coordinate measuring devices, optical and electron scanning microscopes and methods of mathematical-statistical processing of measured data. Additive manufacturing technologies are capable of producing parts with very complex geometries that conform to the desired design without further machining. It is for this reason that they are very promising and their use in industry is growing. In order for additive manufacturing products to fully replace conventionally machined parts, they must meet the required quality criteria such as shape and dimensional accuracy, surface roughness, internal defects, residual stresses, etc. The final quality of parts produced by additive manufacturing technology is influenced by the characteristics of the raw material and the parameters and settings of the system. The aim of the project is to investigate the production of modified monofilaments and the measurement methods necessary for the realization of a stable and reproducible reference test artifact, which would be used to assess not only the geometric capability of additive manufacturing systems but also the internal structure and selected properties of the final product.

Research of properties of magnetic nanoparticles for imaging purposes in biomedical diagnostics based on magnetic resonance methods

Výskum vlastností magnetických nanočastíc pre účely zobrazovania v biomedicínskej diagnostike na báze metód magnetickej rezonancie

Duration: 1.1.2023 - 31.12.2025
Program: VEGA
Project leader: Dr. Ing. Přibil Jiří (PhD.)
Annotation:The project focuses on experimental and theoretical research in the field of magnetic resonance imaging (MRI) methods. The following issues will be addressed in the project: 1. Research of properties of magnetic nanoparticles in external magnetic fields regarding creation of a theoretical model and its subsequent experimental verification. 2. Analysis of MRI scanning effect on cardiovascular system of a tested person in order to find appropriate methods of detection, quantification, and design of measures to minimize them. 3. Analysis of metabolic processes in order to map the rate of energy production in the human heart and muscles in order to diagnose the slowing down of energy production in the heart. 4. Automated processing of MR images of the human knee in order to obtain quantitative characteristics and morphological quantities of individual tissues. 5. Calibration of gradient fields to ensure undistorted morphology in measured MR images. Mapping of inhomogeneities into magn. fields using MRI methods

Changes in fossil lizard communities at older and younger Cenozoic sites in and around Europe as a result of dramatic global climate change – the key to understanding our future is in the past

Zmeny v spoločenstvách fosílnych jašterov na lokalitách staršieho a mladšieho kenozoika v Európe a okolí ako dôsledok dramatických globálnych klimatických zmien – kľúčom k budúcnosti je chápanie minulosti

Duration: 1.1.2024 - 31.12.2026
Program: VEGA
Project leader: RNDr. Hain Miroslav PhD.
Annotation:Terrestrial ecosystems in Europe, but practically everywhere, changed significantly during the Cenozoic due to global climatic changes. The importance of their better understanding is magnified by present global climate change. In that respect, lizards are widely regarded as excellent indicators of past climates, particularly ambient temperatures. The project is focused on the research of new, often complete finds from localities of different ages such as the Paleocene site of Walbeck in Germany, the Lower Eocene sites of Dormaal in Belgium, Cos, Pasturat and Viélase in France. We also include new complete finds from the Middle Eocene German Messel locality (Unesco). Furthermore, fossils from the Oligocene and Lower Miocene sites of Phosphorites du Quercy (France), Miocene to Pliocene sites in Austria, Slovakia, Poland, Hungary, but also in Africa (Kenya) will be studied. The aim is this research using CT is an interpretation of the phylogenetic relationships of studied taxa and changes in their communities.

The total number of projects: 17