Anna Ostaszewska-Liżewska

Warsaw University of Technology

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Roman Szewczyk

Łukasiewicz Research Network - Industrial Research Institute for Automation and Measurements

Michał Nowicki

Warsaw University of Technology

Rafał Kłoda

Łukasiewicz Research Network - Industrial Research Institute for Automation and Measurements

SŻ

Sabina Żebrowska-Łucyk

Warsaw University of Technology

Paweł Nowak

Warsaw University of Technology

Dominika Kopala

Warsaw University of Technology

Peter Råback

CSC - IT Center for Science (Finland)

Piotr Gazda

Warsaw University of Technology

Mika Malinen

CSC - IT Center for Science (Finland)

Tomasz Charubin

Warsaw University of Technology

Cooperative Institutions

Warsaw University of Technology

Łukasiewicz Research Network - Industrial Research Institute for Automation and Measurements

University of Warsaw

Creative Commons

Industrial Research Institute

University of Novi Sad

University of Zagreb

University of Osijek

Slovak Academy of Sciences

Czech Academy of Sciences, Institute of Physics

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Improved Control of Mesh Density in Adaptive Tetrahedral Meshes for Finite Element Modeling

Pomiary Automatyka Robotyka (2022)

Anna Ostaszewska-Liżewska Dominika Kopala Roman Szewczyk

Tetrahedral meshing is the critical element of finite element modeling. Recently, adaptive meshing has been commonly used. In such meshing, according to the Delaunay method, mesh density is connected with the curvature of modeled object’s edge. Such a method is especially efficient during the modeling of mechanical systems. However, the efficiency of commonly used meshing algorithms is strongly limited in surface-focused phenomena, such as eddy current induced by magneto-dynamic processes. The paper proposes the improved method of Delaunay meshing considering the specific requirements of magnetodynamic systems. In the proposed method, tetrahedral mesh density may be flexibly modified according to the needs of modeled physical phenomena, such as eddy current density. As a result, physical effects may be efficiently and accurately described in finite element models. The paper presents the example of implementing the proposed solution for cylindrical wire. The complete source code is available as open-source software for further practical use and development.

Tetrahedron

Adaptive Mesh Refinement

10.14313/par_244/23

Cite

Citations (0)

Inverse Transformation in Eddy Current Tomography with Continuous Optimization of Reference Defect Parameters

Materials (2021)

Paweł Nowak Roman Szewczyk Anna Ostaszewska-Liżewska

This paper presents a methodology of inverse tomography transformation in eddy current tomography with the use of continuous optimization of reference defect parameters. Ferromagnetic steel samples with rectangular air inclusion defects of known dimensions were prepared and measured using an eddy current tomography setup. FEM-based (Finite Element Method based) forward tomography transformation was developed and utilized in inverse tomography transformation. The presented method of inverse tomography transformation is based on the continuous optimization of parameters that can describe the sample, such as the diameter and dimensions of the reference defect. The obtained results of inverse tomography transformation were in high accordance with the real parameters of the samples. Additionally, the presented method had acceptable repeatability. The obtained values of the sample parameters fit within the range of expanded uncertainty when compared to the real parameters of the sample.

10.3390/ma14174778

Cite

Citations (2)

Metrological Aspects in Inteligent Eye-tracking Systems

Anna Ostaszewska-Liżewska

Eye-trackers are tools for measuring and recording the movement of the eyeballs. The advancement of technology implies their accuracy increase, which broadens their use in intelligent systems from supporting work, learning to medical diagnostics. The success of using the eye-tracker depends on selecting a device with appropriate metrological parameters. Meanwhile, no objective, standardized measurement methods give repeatable and reproducible test results. Therefore, comparing the equipment available on the market is difficult. To solve this problem, numerous research centres work on appropriate metrics resistant to the technical parameters of the instrument. Another issue is research into hardware properties with human observers. The individual variability of the participants unnecessarily increases the variance of the results. This article discusses both problems and presents a solution that allows to eliminate the human factor from the procedure for determining the metrological properties of the eye-tracker.

BitTorrent tracker

Tracking (education)

Human eye

10.1109/is57118.2022.10019672

Cite

Citations (1)

Visualization River Water Level Using Internet Technologies

Advances in intelligent systems and computing (2017)

Rafał Kłoda Jan Piwiński Roman Szewczyk Anna Ostaszewska-Liżewska Kamil Duchna

Implementation

10.1007/978-3-319-70452-4_2

Cite

Citations (1)

Finite Element Method Based Toolchain for Simulation of Proximity Estimation Using Electronic Skin

Lecture notes in networks and systems (2023)

Anna Ostaszewska-Liżewska Jan Klimaszewski

Abstract The emergence of new areas of human-robot cooperation creates the need to ensure human safety in this regard. Therefore, there is a need to develop new sensors to detect the presence of a human in the vicinity of a robot. One such sensor is an electronic skin (e-skin). Manufacturing and testing new e-skin prototypes is labor-intensive. This paper presents a software toolchain developed to simulate the operation of an e-skin used to detect human proximity. The toolchain is based on the finite element method and has been developed exclusively with free and open-source software. The presented toolchain makes it possible to test e-skin modifications without the need for a physical prototype and significantly reduces implementation costs. The developed solution is multi-platform and allows parallel and multi-threaded calculations conducted on multiple machines simultaneously. This paper presents modeling results obtained for a simplified e-skin sensor, which are consistent with experimental results on the actual model.

Toolchain

10.1007/978-3-031-37649-8_25

Cite

Citations (0)

Subjective Quality Evaluation of a Full Resolution Video with Eligible Number of Reference Pictures

Pomiary Automatyka Robotyka (2019)

Anna Ostaszewska-Liżewska Rafał Kłoda

The paper presents a new concept of video presentation for subjective quality evaluation methods with a reference given in parallel.The idea is to split a full resolution video into an n-picture matrix and encode each cell differently to compare aspects of processing such as encoding parameters or lossy compression algorithms.Conducted experiments show that it is possible to get more accurate results, shortening the time of evaluation at least by half with a less complicated and cheaper experimental station.

10.14313/par_231/17

Cite

Citations (0)

The WUT database for modeling the visual quality

Advances in intelligent systems and computing (2015)

Rafał Kłoda Anna Ostaszewska-Liżewska Sabina Żebrowska-Łucyk

10.1007/978-3-319-23923-1_82

Cite

Citations (0)

A Human Eye Model for Investigating the Metrological Properties of Video Eye Trackers

Acta Physica Polonica A (2024)

Anna Ostaszewska-Liżewska Anna Pakuła K. Szykiedans