No (11867)
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11867
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The influence of first CNN layer initialization on training convergence
Krejsa, Jiří; Věchet, Stanislav; Chen, K.S.
2023 - English
During evaluation of convolution neural networks on the task of sign language single hand alphabet classification we have discovered that in small but not negligible number of cases the training of the network does not converge at all. This paper investigates the problem that we believe is independent of the application. While the true cause of training divergence was not discovered, we can offer the reader an easy solution from practical point of view – initialization of the first CNN layer using pretrained networks parameters.
Keywords:
convolution neural networks; training; initialization
Available at various institutes of the ASCR
The influence of first CNN layer initialization on training convergence
During evaluation of convolution neural networks on the task of sign language single hand alphabet classification we have discovered that in small but not negligible number of cases the training of ...
Post-processing the results of the topology optimization with the level set technique
Ježek, Ondřej; Kopačka, Ján; Gabriel, Dušan
2023 - English
Topology optimization (TO) has come to the fore with the development of 3D printing. The most commonly used method is SIMP, a density-based approach, which outputs a per-element constant density field and thus requires post-processing to obtain the shape. Conventional post-processing methods extract optimized topologies in the form of brep models. It yields only C0 continuous geometries, which are usually not suitable for downstream applications such as prototyping, design validation, and design exploration. In this paper, we present a new post-processing method based on the level set principle that overcomes common post-processing issues, such as the lack of smoothness.
Keywords:
topology optimization; post-processing; level-set; signed distance function
Available at various institutes of the ASCR
Post-processing the results of the topology optimization with the level set technique
Topology optimization (TO) has come to the fore with the development of 3D printing. The most commonly used method is SIMP, a density-based approach, which outputs a per-element constant density field ...
Fish stock survey of the Lake Sevan in 2023 – final report
Prchalová, Marie; Kubečka, Jan
2023 - English
Final report on survey of fish stock of the Lake Sevan in July 2023.
Keywords:
gillnets; hydroacoustics; biomass
Available at various institutes of the ASCR
Fish stock survey of the Lake Sevan in 2023 – final report
Final report on survey of fish stock of the Lake Sevan in July 2023.
Photo-active liquid crystalline materials: effect of lateral substitution far from the chiral center
Mironov, Sergei; Suchánek, T.; Marhoul, J.; Cigl, Martin; Hamplová, Věra; Bubnov, Alexej
2023 - English
Photosensitive liquid crystalline (LC) materials give a fascinating possibility to tune and control the optical properties of soft systems distantly by illumination by UV-Vis light. Lateral substitution on the molecular core is an effective tool to tune the behaviour of chiral LCs. The effect of lateral substitution (by F, Cl, Br and methyl group) on the self-assembling behaviour, several new LCs with substituents placed on the benzene ring far from the chiral centre are and studied. All compounds, with exception of Br-substituted one, possess the cholesteric phase. The photosensitive behaviour, in particular the conversion of the E-Z isomers, was studied in toluene solution by HPLC. The kinetics of the photo-isomerization was identified under illumination by UV light. Due to presence of a photo-active azo group these materials can be used as functional dopants for design of smart photo-active liquid crystalline mixtures targeted for various applications in optoelectronics.
Keywords:
photosensitive chiral liquid crystal; lateral substitution; azobenzene; E-Z isomerization
Available at various institutes of the ASCR
Photo-active liquid crystalline materials: effect of lateral substitution far from the chiral center
Photosensitive liquid crystalline (LC) materials give a fascinating possibility to tune and control the optical properties of soft systems distantly by illumination by UV-Vis light. Lateral ...
Surface acoustic wave microfluidic chip for rapid cell sorting
Vejrosta, Jakub; Maňka, Tadeáš; Plichta, Tomáš; Šerý, Mojmír
2023 - English
This work revolves around microfluidics and micro-objects manipulation in general. In our device, we are producing surface acoustic wave (SAW). The SAW can be used to sort particles by their size or physical properties and separate them. In medical analysis SAW on microfluidic chip can be used to pre-sorting of body fluids or blood serum for further optical or chemical analysis. The wave is produced by pair of interdigital transducers (IDTs), which are situated on opposite sides of microfluidic channel. As our active material we have used lithium niobate crystalline material for its great piezoelectric properties. This work is also the precursor for measuring the rheological properties of a medium, such as micro-viscosity, via the measurement of the trajectory of a flow trace.
Keywords:
microfluidics; surface acoustic wave; light microscopy
Available at various institutes of the ASCR
Surface acoustic wave microfluidic chip for rapid cell sorting
This work revolves around microfluidics and micro-objects manipulation in general. In our device, we are producing surface acoustic wave (SAW). The SAW can be used to sort particles by their size or ...
Modelling of pulse-triggered running waves on a blade cascade
Šnábl, Pavel; Pešek, Luděk
2023 - English
An experimental cascade of five NACA 0010 blades with pitch degrees of freedom is excited by a moment pulse to one of the blades. Depending on the flow conditions, such as wind speed and the angle of attack of the wind on the blades, the vibration of the excited blade is transmitted by the wind to the other blades. This can result in a running wave that diminishes over time or in a flutter running wave. A simplified spring-mass-damper model with inter-blade connections and non-linear van der Pol dampers is tuned to match experimentally obtained stability curves and tested to see if it can qualitatively model the response of the cascade to the pulse excitation.\n
Keywords:
pulse-triggered running waves; blade cascade; NACA 0010
Available at various institutes of the ASCR
Modelling of pulse-triggered running waves on a blade cascade
An experimental cascade of five NACA 0010 blades with pitch degrees of freedom is excited by a moment pulse to one of the blades. Depending on the flow conditions, such as wind speed and the angle of ...
4th CCP Phenogenomics Conference abstract book
Sedláček, Radislav
2022 - English
The fourth CCP Phenogenomics Conference was held as a hybrid meeting. The scientific committee selected the topic of rare diseases: experimental models & delivery of therapies as the main thematic focus of the 2022 Conference. The Conference provided again an excellent opportunity to support networking and interactions among the researchers, CCP staff, users and experts from the commercial sector.
Keywords:
phenogenomics; rare diseases; gene therapy; experimental models; delivery of therapies
Available at various institutes of the ASCR
4th CCP Phenogenomics Conference abstract book
The fourth CCP Phenogenomics Conference was held as a hybrid meeting. The scientific committee selected the topic of rare diseases: experimental models & delivery of therapies as the main thematic ...
Novel embedding resins for 3D-SEM
Šlouf, Miroslav; Pavlova, Ewa; Strachota, Beata; Strachota, Adam; Nebesářová, Jana; Týč, Jiří; Krzyžánek, Vladislav; Skoupý, Radim
2022 - English
The report contains the detailed analysis of novel embedding resins for 3D-SEM.
Keywords:
novel embedding resins; 3D-SEM microscopy; higher e-beam resistance
Available at various institutes of the ASCR
Novel embedding resins for 3D-SEM
The report contains the detailed analysis of novel embedding resins for 3D-SEM.
Autonomous vehicles lane detection using particle filters
Věchet, Stanislav; Krejsa, Jiří; Chen, K.S.
2022 - English
Lane detection belongs among many others crucial tasks which an autonomous vehicles traveling in urban roads need to take care of. We present a lane detection method which uses particle filters combined with visual information from onboard camera to control the vehicles direction. Our initial experiments shows promising results as applied and tested in urban roads with focus on real-time data processing.
Keywords:
mobile robot; signal processing; measurement
Available at various institutes of the ASCR
Autonomous vehicles lane detection using particle filters
Lane detection belongs among many others crucial tasks which an autonomous vehicles traveling in urban roads need to take care of. We present a lane detection method which uses particle filters ...
5th International Percid Fish Symposium, Percis V 2022
Holubová, Michaela
2022 - English
The publication contains scientific abstracts from the international conference.
Keywords:
abstracts; conference; fish
Available at various institutes of the ASCR
5th International Percid Fish Symposium, Percis V 2022
The publication contains scientific abstracts from the international conference.
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