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242 results on '"Němec, Michal"'

1. Metaheuristic planner for cooperative multi-agent wall construction with UAVs

Author

Elkhapery, Basel, Pěnička, Robert, Němec, Michal, and Siddiqui, Mohsin

Subjects
Computer Science - Robotics
Abstract

This paper introduces a wall construction planner for Unmanned Aerial Vehicles (UAVs), which uses a Greedy Randomized Adaptive Search Procedure (GRASP) metaheuristic to generate near-time-optimal building plans for even large walls within seconds. This approach addresses one of the most time-consuming and labor-intensive tasks, while also minimizing workers' safety risks. To achieve this, the wall-building problem is modeled as a variant of the Team Orienteering Problem and is formulated as Mixed-Integer Linear Programming (MILP), with added precedence and concurrence constraints that ensure bricks are built in the correct order and without collision between cooperating agents. The GRASP planner is validated in a realistic simulation and demonstrated to find solutions with similar quality as the optimal MILP, but much faster. Moreover, it outperforms all other state-of-the-art planning approaches in the majority of test cases. This paper presents a significant advancement in the field of automated wall construction, demonstrating the potential of UAVs and optimization algorithms in improving the efficiency and safety of construction projects.

Published
2023
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21. Analysis of accounting relationships with a focus on the employee area - comprehensive view

Author

NĚMEC, Michal

Subjects
pohledávky, zúčtovací vztahy, závazky, receivables, settlement relations, liabilities, employees, accounting, účetnictví, zaměstnanci
Abstract

The main topic of this bachelor thesis is evaluate the area of settlement relations in the selected company. It is primary focused on the category of employees from the point of view of accounting and finance. There is characterized the settlement with employees, settlement of gross salary, insurance, other receivables and liabilities of business relations and their impact on financial analysis. The thesis contains a description of the selected company, horizontal and vertical analysis of receivables and liabilities. The topic of the bachelor thesis are also wages, their development in the selected company, but also subsidies and labor productivity and wage productivity. The aim is to apply the theoretical basis in the selected company. In the conclusion the overal analysis of the results, or suggestions for improvement.

Published
2022

24. Ho:GGAG Disordered Garnet Crystal for Tunable 2.1 µm Laser

Author

Kratochvíl, Jan, primary, Boháček, Pavel, additional, Šulc, Jan, additional, Němec, Michal, additional, Jelínková, Helena, additional, Kubeček, Václav, additional, Trunda, Bohumil, additional, Havlák, Lubomír, additional, Jurek, Karel, additional, and Nikl, Martin, additional

Published
2022
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33. Mid-Infrared Laser Generation of Zn 1−x Mn x Se and Zn 1−x Mg x Se (x ≈ 0.3) Single Crystals Co-Doped by Cr 2+ and Fe 2+ Ions—Comparison of Different Excitation Wavelengths.

Author

Říha, Adam, Jelínková, Helena, Doroshenko, Maxim E., Jelínek, Michal, Šulc, Jan, Němec, Michal, Vyhlídal, David, and Kovalenko, Nazar O.

Subjects
MID-infrared lasers, LIQUID nitrogen, ACTIVE medium, TRACE elements, SINGLE crystals, DOPING agents (Chemistry), LASERS, Q-switched lasers, SOLID-state lasers
Abstract

Two different mid-infrared (mid-IR) solid-state crystalline laser active media of Cr 2 + , Fe 2 + :Zn 1 − x Mn x Se and Cr 2 + , Fe 2 + :Zn 1 − x Mg x Se with similar amounts of manganese or magnesium ions of x ≈ 0.3 were investigated at cryogenic temperatures for three different excitation wavelengths: Q-switched Er:YLF laser at the wavelength of 1.73 μ m, Q-switched Er:YAG laser at 2.94 μ m, and the gain-switched Fe:ZnSe laser operated at a liquid nitrogen temperature of 78 K at ∼4.05 μ m. The temperature dependence of spectral and laser characteristics was measured. Depending on the excitation wavelength and the selected output coupler, both laser systems were able to generate radiation by Cr 2 + or by Fe 2 + ions under direct excitation or indirectly by the Cr 2 + → Fe 2 + energy transfer mechanism. Laser generation of Fe 2 + ions in Cr 2 + , Fe 2 + :Zn 1 − x Mn x Se and Cr 2 + , Fe 2 + :Zn 1 − x Mg x Se (x ≈ 0.3) crystals at the wavelengths of ∼4.4 and ∼4.8 μ m at a temperature of 78 K was achieved, respectively. The excitation of Fe 2 + ions in both samples by direct 2.94 μ m as well as ∼4.05 μ m radiation or indirectly via the Cr 2 + → Fe 2 + ions' energy transfer-based mechanism by 1.73 μ m radiation was demonstrated. Based on the obtained results, the possibility of developing novel coherent laser systems in mid-IR regions (∼2.3–2.5 and ∼4.4–4.9 μ m) based on A II B VI matrices was presented. [ABSTRACT FROM AUTHOR]

Published
2022
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44. 4.19 μm Fe2+ Ions Lasing in Zn1-xMnxSe:Cr2+,Fe2+ (x = 0.05) Single Crystal under 1.71 μm Laser Diode Pumping via Cr2+ → Fe2+ Ions Energy Transfer

Author

Říha, Adam, primary, Doroshenko, Maxim E., additional, Jelínková, Helena, additional, Němec, Michal, additional, Vyhlídal, David, additional, Jelínek, Michal, additional, Šulc, Jan, additional, Papashvili, Alexander G., additional, Kovalenko, Nazar O., additional, and Terzin, Igor S., additional

Published
2020
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45. STRATEGIE ROZVOJE BYDLENÍ V HLAVNÍM MĚSTĚ PRAZE.

Author

Němec, Michal

Abstract

Copyright of Urbanismus a Uzemni Rozvoj is the property of Institute for Spatial Development and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2021

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