Publikace

informace pocházejí z univerzitní databáze V3S

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Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Daniel Urban; Ing. Lenka Hanáková, Ph.D.; Křipský, F.; Walton, R.; Pecho, P.
Publikováno:
2024, Journal of Aerospace Engineering, 37 (4), ISSN 0893-1321
Anotace:
The conventional pitot-static tube's accuracy in measuring indicated airspeed is compromised by its longitudinal inclination during forward flight, causing errors when the angle surpasses a critical threshold. This study aimed to propose and assess new designs for pitot-static tube ports to mitigate the angle of attack. Modifications, such as enlarging the inlet cross section, altering the tube port's leading surface angle, and introducing new inlet openings, were implemented in five prototypes. After 2D CFD simulations, these prototypes were 3D printed, and experiments were conducted in a wind tunnel across angles from 0° to 55° at three airflow speeds. CFD results indicated increased error with larger inlet diameters and revealed an oscillating error phenomenon for multiple inlet openings. Experimental tests contradicted expected accuracy issues with extended diameters, suggesting superior characteristics at higher angles of attack. An oscillating error of pitot-static tubes with multiple holes was affirmed. The study targeted a pitot-static tube port design with a maximum 5% error in airspeed measurement within attack angles from 0° to 40°, showing promise for vertical takeoff and landing vehicle airspeed measurement during horizontal forward flight.
DOI:
Typ:
Článek v periodiku excerpovaném SCI Expanded

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Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Tomáš Malich; doc. Ing. Luboš Socha, Ph.D. et Ph.D.; Ing. Karel Hylmar; Ing. Lenka Hanáková, Ph.D.
Publikováno:
2024, IEEE Access, 12, p. 109806-109821), ISSN 2169-3536
Anotace:
The increasing diversity of multirotor unmanned aerial vehicles (UAV) designs poses significant challenges in evaluating their flight characteristics and performance parameters. This is particularly true for commercially available UAVs whose control units do not provide users with data that could be used, for example, to estimate the operational and flight limits of the flight device itself. This study introduces the concept of a mountable device designed to track and assess the flight parameters of quadcopters, independent of the UAV's systems. Specifically, it involves independent monitoring of rotations, flight speed, air pressure, temperature, and drone orientation in space. The device validation involved real flight tests with the IRIS+ quadcopter using the Pixhawk control system, whose data were taken as a benchmark for validation. To demonstrate the applicability and benefits of such a device, the study also created a concept of an operational envelope for the drone, i.e. dependence of thrust on weight, angle of attack and speed. This concept was created using robotic simulation in the Gazebo environment. In the simulations, the IRIS+ device was used to simulate flights with different payload weights (0.9-2.9 lb, approximately 0.4-1.3 kg) and twenty flight speeds (1-20 ms-1), while simultaneously monitoring the angle of attack and motor revolutions (subsequently converted to thrust). The created operational envelope was subsequently validated using data from real flights. The overall results demonstrated the successful validation of the designed device and the accuracy of the measurement of critical flight parameters, with rotation measurement errors ranging between 100-200 RPM, angle of attack error at 4.25°, and altitude measurement error based on pressure at 0.56 m. Additionally, within this concept, the measurement of indicated airspeed was introduced, reflecting the expected flight speed values. In the context of validating the operational envelope, the results showed that the parameters of real flights fell within the predicted area of the created operational envelope for the IRIS+ drone. Independent monitoring devices like this can benefit operational limit determination and other testing purposes, especially for UAVs lacking data-sharing control units.
DOI:
Typ:
Článek v periodiku excerpovaném SCI Expanded

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doc. Ing. Bc. Vladimír Socha, Ph.D.; Došel, P.; Ing. Lenka Hanáková, Ph.D.; Oniščenko, B.; Ing. Stanislav Kušmírek, Ph.D.; Petříček, J.
Publikováno:
2024
Anotace:
The document serves as a research report for project CK02000321, summarizing research activities and presenting the main findings within the context of the project's established goals. In addition, it includes a description of the methodological approaches, ensuring that this research is reproducible. The conducted research represents the largest study in this field worldwide in terms of measurements carried out and data collected. We consider the presented results to be generalizable.
Typ:
Oponovaná výzkumná zpráva cizojazyčně

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Publikováno:
2024, New Trends in Civil Aviation: Proceedings of the 24th International Conference on New Trends in Civil Aviation 2024, Praha, České vysoké učení technické v Praze), p. 253-259), ISBN 978-80-01-07181-6, ISSN 2694-7854
Anotace:
The subject of this paper is validating the applicability of a wind wall as opposed to a wind tunnel in testing the performance parameters of a propeller propulsion unit. The primary focus is on unmanned aircraft, a sector experiencing continuous growth and integration into everyday life. This is closely tied to the development of new technologies, particularly in propulsion units, aiming for maximal efficiency and the associated reduction in energy consumption. However, current testing methods for these propulsion units are both costly and time-consuming. Additionally, when utilizing wind tunnels, constraints in terms of space availability pose further challenges. Consequently, verifying the performance parameters of propeller units becomes exceedingly difficult, if not impossible, for many manufacturers and institutions. The implementation of a wind wall would offer an affordable testing alternative, concurrently addressing space constraints when compared to a wind tunnel. This would facilitate further advancements in the realm of unmanned aircraft propulsion. In the presented study, two selected propellers were tested in flow created by wind wall. The acquired data were analysed and subsequently compared with relevant studies focusing on wind tunnel testing. The study's results indicate that the wind wall yields satisfactory results compared to the wind tunnel, suggesting its viability for use, at least in the initial stages of propeller propulsion unit development.
DOI:
Typ:
Stať ve sborníku z prestižní konf.

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Ing. Daniel Urban; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Karel Hylmar; Ing. Stanislav Kušmírek, Ph.D.
Publikováno:
2023, 2023 New Trends in Aviation Development (NTAD), Praha, IEEE Czechoslovakia Section), p. 262-269), ISBN 979-8-3503-7042-3, ISSN 2836-2756
Anotace:
Spatial orientation is very important during flight for the pilot and his ability to correctly perform several parallel tasks related to piloting, navigation and communication. In the event that the pilot loses his own spatial orientation, he must rely solely on the on-board instruments, increasing his workload and the likelihood that the pilot will make a mistake. Further, flight illusions are associated with the loss of spatial orientation and may cause the pilot to perceive inconsistent information about his or her position. Despite the fact that loss of spatial orientation may be commonly encountered by civilian pilots, they are not prepared for these situations as part of their practical training. Although full-flight simulators adapted to induce illusions can be utilized in this context, they are expensive and essentially unused in the training of civilian pilots. This has led to the proposal of a potentially usable and cost-effective technical solution that could be employed in inducing certain types of illusions. Therefore, the article specifically deals with the design of a rotary chair suitable for inducing vestibular nystagmus and the validation of this solution, along with an introduction to the practicality of this solution in the aviation training and research environment.
DOI:
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

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Ing. Daniel Urban; Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Karel Hylmar; doc. Ing. Jakub Kraus, Ph.D.
Publikováno:
2023, Applied Sciences, 13 (5), ISSN 2076-3417
Anotace:
With the expanding electrification in all sectors of transport, it is necessary to look for new efficient solutions for propulsion systems for use in air transport. One of the approaches can be the use of electric ducted fans (EDFs), especially in, but not limited to, the case of unmanned aerial vehicles with vertical takeoff and landing. This concept has been known for several decades but has been used very little and therefore has been almost unexplored. This opens up opportunities for investigating the performance characteristics, electrical consumption or efficient thrust vectoring of EDFs with respect to their design and operational use. The presented study therefore deals with the influence of the EDF design change on its performance characteristics. These design changes mainly concerned the geometry of the cowling, i.e., reduction and increase of outlet cross section, and arrangement of fans, i.e., one- and two-rotor specification. The comparison was based on measuring of vertical thrust and power consumption during static testing. The results showed that the increasing outlet is the most suitable construction for the generation of vertical thrust during static testing, considering the specifically used EDF construction arrangement. Based on the findings, it can also be concluded that EDFs are a suitable option for use in unmanned aircraft as a competition to other propulsion systems.
DOI:
Typ:
Článek v periodiku excerpovaném SCI Expanded

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doc. Ing. Jakub Kraus, Ph.D.; Ing. Adam Kleczatský, Ph.D.; Ing. Michal Černý; Ing. Tomáš Tlučhoř; Ing. Stanislav Kušmírek, Ph.D.; Ing. Šárka Václavíková; Hodač, R.; Sekyrová, K.; Böhm, A.
Publikováno:
2023
Anotace:
Cílem Provozní koncepce U-space pro ČR je komplexně definovat subjekty, procesy, data, vztahy a dopady implementace U-space v České republice. Provozní koncepce U-space pro ČR tak slouží jako generální dokument pro implementaci U-space v ČR ze systémového pohledu. Jedná se o výsledek CK01000185-V1 a naplňuje popis: „Celková provozní koncepce U-space pro ČR bude založena na nově připravované legislativě a bude zohledňovat budoucí požadavky na integraci UAS provozu. Koncepce bude rovněž reflektovat spektrum postupů a zkušeností, které zakomponuje při vytváření integračních zásad. Budou definovány role všech zainteresovaných stran a navrženy datové vazby mezi ŘLP, FIMS manažerem a poskytovatelem služeb U-space s definováním všech vstupů a datových toků pro zajištění dynamických informací o vzdušném prostoru.“
Typ:
Výsledek promítnutý do schvál. strateg. a koncepčních dokumentů

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Ing. Daniel Urban; Ing. Karel Hylmar; Ing. Stanislav Kušmírek, Ph.D.; Ing. Lenka Hanáková, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.
Publikováno:
2023, 2023 International Conference on Military Technologies (ICMT), Vienna, IEEE Industrial Electronic Society), ISBN 979-8-3503-2568-3
Anotace:
The subject of this research is the development of ducted propulsion systems as replacements for traditional propeller propulsion systems intended for unmanned aircraft (UA). With the increasing number of operating UA and level of their automation, new possibilities for using UA in a number of applications are emerging. According to current legislation, one of the main limitations of the use of UA to date is the insufficient safety of UA operations over populated areas. Current UA equipped with propeller drive units do not achieve the required safety due to the rotating propeller blades. Ducted propulsion systems eliminate this shortcoming and provide other advantages that find their place mainly in conditions with space limitations. It is therefore necessary to find an optimal solution to these urban traffic problems. It is thus offered as a safety solution when operating in shared spaces near non-involved persons. The proposed specifications in this study are tested and the data subsequently compared with selected reference propeller drives from the point of view of energy consumption and generated thrust value. The aim of this study is to propose an optimal operational specification of the EDPS engine, suitable for UA operation from the point of view of better energy consumption and generated thrust compared to propellant systems. The results of the study prove that EDPS propulsion systems generate more thrust with lower total energy consumption than conventional propeller systems.
DOI:
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

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Jankech, P.; Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Michaela Kalivodová
Publikováno:
2022, 2022 New Trends in Aviation Development (NTAD), Prague, Czechoslovakia Section IEEE), p. 76-80), ISBN 979-8-3503-2036-7
Anotace:
Negative factors affecting the flight safety need to be counteracted by measures based on an understanding of the nature of the problem. Due to the fact that visual illusions are considered a factor capable of endangering the safety of the crew and passengers, it is necessary to understand the mechanics of their creation. Therefore, this paper focuses on the device able to induce specific visual illusion by the means of moving perspective that could be used as a support during the efforts to understand the mechanism of such illusions. The mirror system with variable speed of movement is designed to induce a change of perspective and thus postural destabilization of the subject. Proposed device was tested in the experiment involving postural stability measurements in the form of centre of pressure monitoring using the balance board as the indicators of sucesfull illusion induction. The results does not confirm the ilussion induction. However, the effect of mirror movement direction is observed.
DOI:
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

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doc. Ing. Bc. Vladimír Socha, Ph.D.; Vídeňský, J.; Ing. Stanislav Kušmírek, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Viktor Valenta, Ph.D.
Publikováno:
2022, 2022 New Trends in Civil Aviation (NTCA), Praha, České vysoké učení technické v Praze), p. 109-114), ISBN 978-1-6654-5190-1
Anotace:
Eye tracking is an effective method of observing human-machine interactions. There is a rapidly growing demand for lightweight eye trackers and live data analysis. In this project, a wearable device was designed by attaching existing eye tracking cameras to a new glasses frame. The device was tested in the cockpit of a Cessna 182 with the aim of automatically recognizing individual instruments and highlighting the point of gaze. Software for both real-time and post hoc areas of interest recognition was developed. A machine learning algorithm built a model based on one thousand randomly chosen frames with manually identified instruments. Additional five hundred frames were used to test the model. The system performed very well under well-lit static conditions. In flight, the average success rate of primary flight instruments detection dropped to 0.64. This is still considered acceptable performance, as the test profile included a portion of a flight into direct sunlight. The device is currently used for a pilot fatigue research project and for pilot training.
DOI:
Typ:
Stať ve sborníku z prestižní konf.

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Ing. Karel Hylmar; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Daniel Urban; Ing. Miroslav Špák, Ph.D.
Publikováno:
2022, 2022 New Trends in Civil Aviation (NTCA), Praha, České vysoké učení technické v Praze), p. 115-122), ISBN 978-1-6654-5190-1
Anotace:
Vertical Take-off and Landing Unmanned Aerial Vehicles (VTOL UAVs) are operated at low flight levels, close to the ground, where they are exposed to meteorological conditions, which are difficult to predict and can cause severe degradation of their aerodynamic, performance and flight characteristics. Of these meteorological conditions, icing is one of the most dangerous for the operation of VTOL UAVs. Although icing poses significant safety and operational risks, it has not yet been taken into account in their operation and there are no certified and verified anti-icing and de-icing solutions against it. The aim of this work is to propose a concept together with testing methodology, which would allow to determine the influence of individual meteorological conditions of icing on selected performance characteristics of propulsion systems of VTOLUAVs. Testing and exposure of propulsion systems to icing conditions took place in the climatic chamber. Several series of measurements were performed in the climatic chamber, in which the propulsion systems were exposed to a temperature of 15, of −5, of −10 and of −15°C and a flow of super-cooled water droplets of 1.43 g/s. The mutual comparison of the performed measurements made it possible to determine the influence of individual conditions on the decrease of the thrust, the increase of the consumed electric current and the occurrence of vibrations.
DOI:
Typ:
Stať ve sborníku z prestižní konf.

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doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Weiss, J.; Ing. Roman Matyáš, Ph.D.; Ing. Liana Karapetjan; Ing. Terézia Pilmannová, MBA; Ing. Stanislav Kušmírek, Ph.D.
Publikováno:
2022, Transportation Research Procedia, Amsterdam, Elsevier B.V.), p. 275-282), ISSN 2352-1457
Anotace:
Proven by accident statistics, a tired pilot poses a threat to safe flight operations, especially in its critical phases, such as the approach to landing. In the context of the fatigue's impact on the accurate execution of the approach to landing, no research has yet been carried out to experimentally confirm/deny the impact of this factor on the pilot's performance. Therefore, this study examines the impact of fatigue on the final approach phase through a 24-hour flight simulator experiment. Eight subjects participated in the study, performing 15 instrument approaches over the time period defined above. In order to quantify the stabilised portion of the approach, a time-based approach was defined. The approach was based on identifying the portion of the approach executed in the prescribed descent region of pyramidal shape expressed in percent. The results show a link between the precision and accuracy of the instrument approach execution and the level of pilot fatigue, which can lead to unstabilised approaches that negatively affect overall safety. Therefore, the experimental setup, methodology, and results can serve as an evidence-based approach for a more concrete definition of fatigue risk management or as a knowledge base for further development of this issue.
DOI:
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

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Dittel, D.; Ing. Roman Matyáš, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.
Publikováno:
2022, 2022 New Trends in Civil Aviation (NTCA), Praha, České vysoké učení technické v Praze), p. 123-128), ISBN 978-1-6654-5190-1
Anotace:
This article deals with experimental assessment of whether SPL holders acquire the necessary competencies for the first solo flight in a powered aircraft using only virtual reality. The experiment was performed on a sample of 10 participants who were trained using a simulator based on virtual reality. All participants succeeded in the simulator training, although differences in the length of training required were observed. This training was followed by a flight in a real airplane that consisted of 3 traffic patterns. The participants also filled out questionnaires. This subjective self-assessment was then compared with an objective assessment (flight data, instructor's comments). The outcome was 5 successful and 5 unsuccessful participants of assessment flight in the real airplane. On a sample of 10 participants, areas that are suitable for training in a virtual reality environment were identified. Results indicate that virtual reality is a suitable complement to pilot training, but it is not suitable to use as the only means of flight training.
DOI:
Typ:
Stať ve sborníku z prestižní konf.

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doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; Ing. Tomáš Malich; Gavura, T.; Ing. Viktor Valenta, Ph.D.; Ing. Martin Kavka; Piorecká, V.; doc. Ing. Andrej Lališ, Ph.D.
Publikováno:
2021, 2021 International Conference on Military Technologies (ICMT), Praha, IEEE Czechoslovakia Section), ISBN 978-1-6654-3724-0
Anotace:
Simulation technologies have significantly evolved in recent years. Devices providing high fidelity simulation are becoming widely available in many sectors. In transportation, simulators have proven successful in personnel training, modeling nonstandard situations and even in development and research. The primary use of simulation is still focused on educational purposes. The simulated environment provides grounds for monitoring and assessment of trainees' behavior. However, in addition to simulation technologies, other tools must be deployed. These tools record the physiological functions of the trainee and assess psychophysiological conditions. Specific events, such as a stressful situation, can be detected. Similar scientific-related activities may also lead to assessment of perception. This is a complex problem for both evaluation and data collection. Additionally, it puts specific demands on experimental equipment. The presented article describes the development of a flight simulation device that enables the evaluation of the pilots' perception. This solution is based on X-Plane flight simulation engine with virtual reality (VR) and employs eye-tracking, brain activity monitors and heart activity monitors. The cockpit has a modular design and can be adapted to several aircraft types. VR-Gloves are used to interact with actual aircraft controls such as control yoke, thrust levers and even overhead panel switches. This setup creates a real-feel concept when controlling the aircraft. The presented solution is a technology demonstrator and is being tested with aviation training scenarios.
DOI:
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

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Ing. Stanislav Kušmírek, Ph.D.; Ing. Tomáš Malich; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Gavura, T.; Ing. Roman Matyáš, Ph.D.; Ing. Karel Hylmar
Publikováno:
2021, 2021 International Conference on Military Technologies (ICMT), Praha, IEEE Czechoslovakia Section), ISBN 978-1-6654-3724-0
Anotace:
New requirements for classifying unmanned aerial vehicles are forcing institutions as well as manufacturers to devise established procedures and methodologies for testing vehicles. A new possibility of dynamic testing of performance parameters of multicopters is offered in addition to conventional software modeling of flight characteristics and static tests in wind tunnels. This alternative is currently hampered by the problem of flight data collection. This work deals with the design of a complex measuring device specially designed for the testing of the flight characteristics of unmanned aerial vehicles. The proposed modular device provides the user with a flight record containing time-synchronized data showing the linear and angular accelerations achieved by the vehicle during flight, three-axis roll, flight altitude, magnetic course, multicopter speeds, and revolutions of each power unit separately. This work further defines the conditions imposed on the type of tested multicopter (load capacity) and the subsequent need for its balancing. The output of this work is to support the experimental research of dynamic quantification of multicopter performance properties during flight.
DOI:
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

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Ing. Lenka Hanáková, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; Ing. Liana Karapetjan; doc. Ing. Andrej Lališ, Ph.D.; Ing. Kateřina Stuchlíková; Ing. Michaela Kalivodová; Ing. Tomáš Malich; Ing. Oldřich Štumbauer, Ph.D.
Publikováno:
2021
Anotace:
Cílem projektu bylo vytvoření konceptu měření, analýzy a vyhodnocení psychofyziologické kondice pilotů jako potenciálního indikátoru selhání v závěrečné fázi přiblížení a přistání na letišti, s hlavním ohledem na analýzu variability srdečního rytmu, kvantifikaci EEG a modelování vizuální percepce. Koncept cílil na zvyšování bezpečnosti letecké dopravy tím, že umožní vyhodnocení psychofyziologické kondice a kognitivních schopností posádky ve fázi letu, která patří mezi nejrizikovější a nejvíce náchylné na nedostatky leteckého personálu. Dosažení konceptu umožní další zlepšování úrovně provozní bezpečnosti v letectví pomocí snížení rizika souvisejícího s jednotlivými úkony při přistání na letišti. Pro tyto účely byl vytvořen simulátor, který je schopen prostřednictvím virtuální reality simulovat let se společným sledováním pohybu očí ve scéně a sběr fyziologických dat. Výzkumná zpráva ukazuje na aktivity spojené s realizací tohoto zařízení, předzpracování zaznamenaných dat/signálů, jejich význam, způsob interpretace těchto dat a v neposlední řadě nastavení experimentálních měření a jejich evaluaci. Projekt probíhal od 06/2019 do 05/2021. V rámci řešení projektu vzhledem k pandemii Covid-19 neměl řešitelský tým kontinuální přístup na pracoviště a nebylo tak možné realizovat některé aktivity v plném, zamýšleném rozsahu. Tato situace trvala od 03/2020 do 03/2021 a dopadla především na měření zahrnující lidské subjekty, jejichž realizace nebyla možná vůbec nebo za velmi omezených podmínek. I přes uvedené problémy, vynaložil řešitelský tým značné úsilí pro úspěšné ukončení projektu a splnění všech závazků s ním spojených.
Typ:
Oponovaná výzkumná zpráva v češtině

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doc. Ing. Bc. Vladimír Socha, Ph.D.; Socha, L.; Ing. Lenka Hanáková, Ph.D.; Ing. Liana Karapetjan; Ing. Viktor Valenta, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; Ing. Terézia Pilmannová, MBA; Ing. Peter Olexa
Publikováno:
2020, Transportation Research Procedia, Linz, Elsevier BV), p. 252-260), ISSN 2352-1465
Anotace:
There is a great emphasis on safety in the field of aviation. Advanced technologies open new possibilities and allow objective measurements of specific safety factors. One of these factors is undoubtedly human performance which is already a significant element within a training of aviation personnel. The area of the highest interest is focused on pilot training. The aim of this study is to examine whether a specific psychological training can be considered as a positive performance influencing factor. Subjects underwent an experimental training schedule which was designed for the purpose of this study. Subjects were divided into control (n=20) and experimental (n=20) groups. The experimental group underwent Jacobson progressive relaxation psychological training. Both groups were evaluated during the experimental training schedule; accuracy and precision of piloting was measured during the second and eleventh hour of training. This study focused on basic flight maneuvers, i.e. straight and level flight, 360° horizontal turn with 30° bank and 180° climbing/descending turn with 15° bank and vertical speed of ± 500 ft/min. For the purpose of maneuver identification, Density-based spatial clustering of applications with noise algorithm was used. Each maneuver was evaluated for precision and accuracy and at the same time and used for a performance comparison between groups. Paired and between subject statistical testing were performed using appropriate statistical methods at the level of significance p<0.05. The results indicated that the implemented psychological training did not affect the performance of pilots in terms of precision and accuracy.
DOI:
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

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doc. Ing. Bc. Vladimír Socha, Ph.D.; doc. Ing. Luboš Socha, Ph.D. et Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Viktor Valenta, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Andrej Lališ, Ph.D.
Publikováno:
2020, Applied Sciences, 10 (15), ISSN 2076-3417
Anotace:
During their professional career, pilots often experience a change in workplace conditions in the form of an aircraft cockpit ergonomics change. Change of working conditions may impact their perception of flight data or the pilot's psychophysiological condition, especially in cases of inexperienced pilots. The presented study deals with the influence of cockpit ergonomics change on the performance and pilot workload during a training course. We divided 20 subjects with no previous practical flying experience into two training groups (Gr. A and Gr. B). The flight training was focused on acquisition of basic piloting skills where both groups experienced cockpit ergonomics change in different training phases. The performance (piloting precision) was assessed based on deviations from predetermined parameters of the monitored flight manoeuvres. Heart rate variability qualified the extent of workload. The study showed the influence of the cockpit arrangement on piloting precision, where the transition to other type of cockpit ergonomics did not influence pilots' subjective workload with statistical significance.
DOI:
Typ:
Článek v periodiku excerpovaném SCI Expanded

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doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Peter Olexa; Ing. Jakub Šimerka
Publikováno:
2020, 2020 New Trends in Civil Aviation, Praha, IEEE Czechoslovakia Section), p. 135-138), ISBN 978-80-01-06726-0, ISSN 2694-7854
Anotace:
This paper is describing the prototype of a new patent of a Portable Reaction Time Measurement Device whose main assets in comparison to the conventional devices for the similar purposes are the portability, independence on the electrical power source, the absence of the personal computer and the immediate readiness for the usage once the device is turned on. The main contribution of this device is, that it allows to test the actual values of the reaction times at any given time and in any given situation without the necessity of the complicated hardware or software set-ups. It’s construction allows to be used in e.g. the pre-flight psycho-physiological assessment’s of the pilots directly short before the flight conduction or monitoring the daily fluctuation of the reactions readiness directly in the work environment of the concerned study subjects. The basic electrical scheme and the hardware and software components are presented. Furthermore, there was a successful experiment proposed and conducted to test the technical functionalities. Also the usability validation and comparison has been made with the positive outcomes.
DOI:
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

Autoři:
Ing. Tomáš Malich; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Roman Matyáš, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; Kráčmar, V.
Publikováno:
2020, AIAA/IEEE Digital Avionics Systems Conference - Proceedings, Institute of Electrical and Electronics Engineers, Inc.), ISBN 9781728198255, ISSN 2155-7195
Anotace:
In this paper, we present a complex solution for flight data gathering, analyzation, and visualization. This solution can be used for the Competency-Based Training of pilots in general aviation. For the data gathering, we are introducing a concept of an embedded device. For data analyzation, we are introducing the approach for algorithmic detection of flight maneuvers based on the recorded flight data. There is a multiplatform software application for data visualization. We are also describing the reasons for creating such solutions and potential future uses of our hardware and software products. This paper is mostly describing the important requirements and their implementation regarding the future usage for Competency-Based Training of pilots in general aviation. We are not describing a lot of technical details to keep this paper straightforward and we are mostly focusing on passing the whole idea and benefits of our products.
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Typ:
Stať ve sborníku z prestižní konf.

Autoři:
Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Karel Hylmar; Ing. Roman Matyáš, Ph.D.; Kubový, P.
Publikováno:
2020, 2020 New Trends in Civil Aviation, Praha, IEEE Czechoslovakia Section), p. 129-133), ISBN 978-80-01-06726-0, ISSN 2694-7854
Anotace:
In recent years, drones have experienced rapid technological development. The new EU regulations, therefore, apply to both users as well as manufacturers of unmanned aerial vehicles. The mentioned legislation does not yet precisely define the testing methodology and methods of required parameters of each individual category of unmanned aerial vehicles. This study pays special attention to the possibility of dynamic indoor testing of multicopters. It raises the research question of the possibility of experimental determination of the pitch angle as a partial characterisation of a vehicle in flight with manual control of a multicopter against continuous airflow. A simplified wind tunnel generated the airflow with a lamella regulator. Three 10 minute experimental flights were performed against an airflow rate of 1.45 / 2.43 / 3.42 m/s. The task of an experienced pilot was to keep the multicopter in the middle of the airflow during hover manoeuvre. The flight data of the multicopter were recorded by an inertial motion capture (MoCap) system Inertia ProMove in the form of a quaternion and linear accelerations. The results of the study do not show an increase in the median value of the pitch angle of the quadcopter when manually maintaining the hover against the airflow rate in the wind tunnels. On the contrary, as expected, the correlation of the pitch quadcopter and forward linear acceleration was demonstrated. This pilot study presents a possible methodology for indoor testing of a partial aspect of the flight characteristics while drawing attention to the problem of such dynamic testing.
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Stať ve sborníku z prestižní konf. (Scopus)

Autoři:
doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Viktor Valenta, Ph.D.; Socha, L.; Ábela, R.; Ing. Stanislav Kušmírek, Ph.D.; Ing. Terézia Pilmannová, MBA; Tecl, J.
Publikováno:
2020, Transportation Research Procedia, Linz, Elsevier BV), p. 243-251), ISSN 2352-1465
Anotace:
Air traffic controllers (ATCOs) are exposed to high workload even during routine operations. Their job carries a lot of responsibility and consists of complex tasks. In order to enhance high safety standards, a systematic evaluation of workload levels is required. This study explores an objective measurement of workload. Heart activity of ATCOs was monitored in order to indicate psychological status of ATCOs while being exposed to different levels of workload - in terms of changing traffic loads and airspace complexity. A standard method was used for the evaluation of heart activity. This method includes the frequency analysis in context of heart rate variability; time intervals of consecutive R waves in the heart activity record are assessed. The evaluation of the ratio of power in the low-frequency and high-frequency bands (indicator of sympathovagal balance) as well as parameters derived from fluctuation analysis were used. The results indicated that parameters of heart rate variability based on spectral analysis were significant in case of workload evaluation.
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Stať ve sborníku z prestižní konf. (Scopus)

Autoři:
doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; Ing. Michaela Kalivodová; Ing. Sarah Van Den Bergh
Publikováno:
2019, 2019 Konference - 25 let Fakulty dopravní, Praha, České vysoké učení technické v Praze), p. 72-74), ISBN 978-80-01-06545-7
Anotace:
Předložený článek představuje Laboratoř lidského faktoru a automatizace v letectví, která je jedním z vědeckých pracovišť na Ústavu letecké dopravy, FD ČVUT v Praze. Studium lidského faktoru v letectví je ve vědecké komunitě známé již několik dekád. Neustálý technický pokrok a výzkum v této oblasti však stále přináší nové otázky a výzvy. Laboratoř má snahu monitorovat nové trendy v diskutované oblasti a zapojovat se do výzkumných aktivit reflektujících současné požadavky ne jen na letecký personál. Článek stručně popisuje nejvýznamnější výzkumné aktivity laboratoře spolu s navázanými spolupracemi.
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Stať ve sborníku z fakultní konference česky

Autoři:
Ing. Michaela Kalivodová; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Socha, L.; Ing. Roman Matyáš, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.
Publikováno:
2019, TRANSPORT MEANS 2019 - PROCEEDINGS OF THE 23rd INTERNATIONAL SCIENTIFIC CONFERENCE, Kaunas, Kaunas University of Technology), p. 835-840), ISSN 1822-296X
Anotace:
During the flight, pilots are influenced by surrounding stimuli such as environment, gravity, mental state, et cetera, which may affect (in a negative way) the safety of flight. Standard evaluation methods of physiological parameters are used to monitor the pilot's state. The most commonly monitored and evaluated parameter is heart rate because it reflects the regulation of the autonomic nervous system. Based on the knowledge of evaluation of time series consisting of time intervals between two consecutive heartbeats, the spectrum analysis is used in specific frequency bands. Inter alia, such time series are evaluated in a time domain, or by nonlinear methods. Standard spectrum analysis or other nonlinear methods, however, do not contain time information. In other words, it is necessary to apply these analyses on time windows gradually scanning received signal which limits using these methods for real-time evaluation of the psychophysiological condition. This paper discusses the Wavelet Transform being it a method for processing the heart rate variability as it is/seems a perspective method for online monitoring of pilots' psychophysiological state. Measurement of subjects was conducted on a flight simulator and in the aircraft as well. Obtained knowledge might positively affect monitoring pilots in training by adjusting the training according to their specific needs.
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

Autoři:
Ing. Stanislav Kušmírek, Ph.D.; Ing. Lenka Hanáková, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Sarah Van Den Bergh; Ing. Michaela Kalivodová; doc. Ing. Jakub Kraus, Ph.D.; Petruš, O.
Publikováno:
2019, TRANSPORT MEANS 2019 - PROCEEDINGS OF THE 23rd INTERNATIONAL SCIENTIFIC CONFERENCE, Kaunas, Kaunas University of Technology), p. 1197-1202), ISSN 1822-296X
Anotace:
Since the beginning, aviation has been exposed to the risk of threats of unlawful acts, such as attacks, hijacks, or bomb attacks. The priority of current safety systems is to eliminate the risk of possible unlawful acts to critical infrastructure. However, tightening the net of security checks has a downside - individuals or organizations execute the act of violence even before the baggage security check done by mainstream spectroscopic methods. Thus, airport terminals with large crowd concentration are becoming a perfect target for terrorists to attack. A factor contributing to forming a crowd is a thorough, time-consuming security check. In a short time, the crowd concentration rapidly increases in an unsecured perimeter and as such, is an easy target. Man-made explosives, as well as several military, industry or difficult to access, have a common component - ammonia. Bombs could be made by various forms of ammonia, like ammonium nitrate, chloraminȩ or a compound of ammonia and aluminum oxide. For that reason, the detection of ammonia present in airports becomes a frequently discussed topic among aviation security experts. The paper aims to create a concept of the sensory network able to monitor in 2D or localize a source of ammonia trace elements. The proposed idea is intended to use in airports, but the concept is also applicable in places where a noninvasive and contact-less passenger or baggage security check is needed.
Typ:
Stať ve sborníku z prestižní konf. (Scopus)

Autoři:
doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; Ing. Slobodan Stojić, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; Socha, L.; Antoško, M.
Publikováno:
2018, New Trends in Civil Aviation, Leiden, CRC Press/Balkema), p. 15-19), ISBN 978-0-8153-7602-6
Anotace:
Currently, the most erroneous element during the flight operation is a human. Regarding to continuous efforts spent on increase of the air transport safety level, a greater attention is now focused on human factors and comprehension of the factors having a negative impact on pilots and other crew members. The main goal of this study is to evaluate the fatigue effect on pilot performance during at least 24-hour measurements. The whole measurement consisted of two-hour time blocks, during which the pilot was flying, then the reaction time was measured and at the end psychological tests were conducted. The reaction time was chosen as an indicator of short-term performance. The study involved 4 pilots (men aged 21–27 years) with a given pre-flight regime. The results show that even though the pilots experienced a gradual fatigue during the measurements, it did not manifest in reaction times measurements. It can be stated, that despite the fatigue, the pilots are able to maintain short-term attention and maintain constant performance.
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Stať ve sborníku z prestižní konf. (Scopus)

Autoři:
Socha, L.; Kaľavský, P.; Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.
Publikováno:
2018, New Trends in Process Control and Production management, London, CRC Press), p. 471-476), ISBN 978-1-138-05885-9
Anotace:
Study of aviation accidents in general came to conclusion that aviation accidents are always caused by more than just a single factor. They are often caused by the combination of mistakes, which singe failure itself doesn't have to neccesarly cause the critical situation. As long as the crew is not able to break the chain of smaller mistakes by correct procedure, it can lead to exhaustion of physical resources able to solve more complicated mistakes, which in a long term can lead to a cathastrophe, human as well as financial losses. In these cases we talk about the failure of crew – incorrect management of human resources on board of a plane. Listed facts certainly show the decrease in number of incidents and increase in safety of flights could be achieved by better training of pilots. There are many areas which could lead to the improvement of this. They mainly include the increase in the technical knowledge among the crew, improvement of trained processes and procedures and in gaining more experience during the practical training of pilots. The improvement of practical training of pilots could be the key factor to the overall improvement in safety on board. In a relation to this it is very necessary to specify basic critical elements of the practical training. For this purpose we created a survey presented to the target group. The result of this survey shows over 66% of participants haven't noticed any effort from authorities to improve training processes of pilots (60 respondents) At the same time all participants of this survey agreed on the fact that its of essence to pay a lot of attention to this issue. Based on results its easy to say that introduction of new technologies and new processes during training of pilots and personal on board would increase the effectivnes of the training and the safety of flights, leading to the decrease in number of aviation incidents, meaning less financial and especially human losses.
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Typ:
Stať ve sborníku z mezinár. konf.

Autoři:
doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Stanislav Kušmírek, Ph.D.; Ing. Lenka Hanáková, Ph.D.; doc. Ing. Andrej Lališ, Ph.D.; Pereverzeva, A.; Průcha, J.; Socha, L.; Hanák, P.
Publikováno:
2018, TRANSPORT MEANS 2018 - PROCEEDINGS OF THE 22nd INTERNATIONAL SCIENTIFIC CONFERENCE, Kaunas, Kaunas University of Technology), p. 580-584), ISSN 1822-296X
Anotace:
At present, the concept of reaction time measurement is used as one of the methods of psychological testing. Its usage spectrum, however, covers rehabilitation medicine, neurosciences and similar. Available systems used to measure reaction time deal with complex reaction time, i.e. the time between generating the stimuli and respective reaction via effector. Typical limitation is the design of these devices, which usually fits specific application, but it is not reusable for other applications. The goal of this paper is to introduce concept of device measuring reaction time of both upper and lower limbs, to visual or acoustic stimuli. Design of the device allows for application independence, i.e. it is reusable for wide range of different applications. This independence is supported by open software platform, including base set of testing tasks. In case of measurement of upper limb reaction time, the device allows measurement of individual components of the reaction time, opening new capabilities for deeper understanding of human sensory systems with respect to the speed of reaction to external stimuli.
Typ:
Stať ve sborníku z prestižní konf.

Autoři:
Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; doc. Ing. Andrej Lališ, Ph.D.; Socha, L.; Antoško, M.; Kozuba, J.
Publikováno:
2018, New Trends in Civil Aviation, Leiden, CRC Press/Balkema), p. 21-24), ISBN 978-0-8153-7602-6
Anotace:
Reaction time monitoring is currently routine in medicine and psychological practice. Monitoring of human reflexes concerning rapidly changing external visual stimuli in means of transport is one of the basic research activities in transportation sciences. These activities allow transfer of knowledge and innovations into practice. Human factors, especially in the aviation, can lead to significant fatalities. Selection of suitable candidates to perform such psychologically demanding occupation requires utilization of new testing tools and procedures. The basic idea to develop a device to measure reaction time was to offer suitable tool to physicians and research workers to explore human sensomotorics. The paper describes development of a new device to measure reaction time.
DOI:
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Stať ve sborníku z prestižní konf. (Scopus)

Autoři:
Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; doc. Ing. Jakub Kraus, Ph.D.; Ing. Sarah Van Den Bergh; Hůlek, D.
Publikováno:
2018, Young Transportation Engineers Conference 2018, Praha, Fakulta dopravní), ISBN 978-80-01-06464-1
Anotace:
One of the priority tasks of contemporary security systems is to eliminate risks of unlawful acts related to terrorist attacks on critical infrastructure. Airports, among other things, are part of this infrastructure. Pre-screening of passenger’s baggage chemical composition during entrance into an airport hall, with no need for slowing down of passenger flow or raising suspicion in potential perpetrator of unlawful act during the check process, could eliminate number of casualties of such attacks. Traces of ammonia present in almost every type of explosives provide one of the possibilities to separate suspicious baggage and persons from the rest of passengers. The goal of this work is thus creation of a sensory network concept capable of 2D monitoring or localization of the ammonia traces source in space. Such system could find its application also in rail or bus transportation.
Typ:
Stať ve sborníku z mezinár. konf. cizojazyčně

Autoři:
Ing. Stanislav Kušmírek, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Ing. Lenka Hanáková, Ph.D.; doc. Ing. Andrej Lališ, Ph.D.; Duman, D.; Socha, L.
Publikováno:
2018, New Trends in Civil Aviation, Leiden, CRC Press/Balkema), p. 261-266), ISBN 978-0-8153-7602-6
Anotace:
In practice, inexperienced pilots tend to excessively manipulate the aircraft control stick when attempting to direct an aircraft into a desired attitude. This causes piloting inaccuracies, which may lead to undesired flight situations. The objective of this paper was to identify the relationship between accuracy, or more precisely piloting error rate, and the physical activity of the pilot’s upper limb. Effort was also made to prove the fact that inaccurate upper limb input can be detected by means of values measured by an accelerometer. The evaluation was performed with 10 subjects during flight training with the main focus on evaluating the error rate during execution of climbing and descent 180° turn. The measurements were made on TRD40 flight simulator, evaluated by the proposed methodology of processing accelerometer data, and subsequently compared with real error rates calculated from flight data. The results confirmed a correlation between error rates inferred from flight data and error rates determined based on the accelerometer data. Because the research conducted in the domain is a pilot study, the results provide opportunities for discussion and possibilities of further research.
DOI:
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Stať ve sborníku z prestižní konf. (Scopus)

Autoři:
Ing. Lenka Hanáková, Ph.D.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Socha, L.; Szabo, S.; Kozuba, J.; doc. Ing. Andrej Lališ, Ph.D.; doc. Ing. Peter Vittek, Ph.D.; doc. Ing. Jakub Kraus, Ph.D.; Rozenberg, R.; Kalavský, P.; Ing. Martin Novák, Ph.D.; Schlenker, J.; Ing. Stanislav Kušmírek, Ph.D.
Publikováno:
2017, Proceedings of the 2017 International Conference on Military Technologies (ICMT), Brno, Ministerstvo obrany, Univerzita obrany), p. 500-506), ISBN 978-1-5386-1988-9
Anotace:
At present, several studies exist describing the relevance of human factor in air transport with main focus on pilots and flight safety. Within such studies, monitoring of physiological functions is used. There are lot of physiological parameters and methods of their assessment; however, they are mostly based on principles originating from clinical practice. Yet, sensitivity and specificity of these methods with regard to assessment of aviation professionals - pilots is unknown. Therefore, this paper is oriented towards description of the most common methods for physiological parameters assessment. The paper also describes evaluation methods, which are on experimental level in terms of physiological data evaluation, namely recurrent quantification analysis. Within the research carried out, sample group of pilots was subjected to measurement for evaluation of their psychophysiological condition and performance. Selected evaluation methods were applied on the collected data and importance of those parameters and methods, which provided best classification for level of psychophysiological stress, was evaluated by means of statistical analyses. The results indicate that the most important physiological parameter for psychophysiological condition assessment of pilots is heart electrical activity where the possibility to perform signal processing whilst preserving its importance is provided by linear methods in the time and frequency domain, or alternatively by non-linear methods utilizing recurrent quantification analysis.
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Typ:
Stať ve sborníku z prestižní konf. (Scopus)

Autoři:
Socha, L.; Boldiová, V.; Tobisová, A.; Ing. Stanislav Kušmírek, Ph.D.
Publikováno:
2017, MAD - Magazine of Aviation Development, 5 (3), p. 24-28), ISSN 1805-7578
Anotace:
The article presents and clarifies the topic that was focused on the influence of stress factors in the manger’s activity. The subject of the evaluation was the impact of stress on the work and performance of managers. Using the methods we used, we learned about whether stress is a daily part of the managerial position from the point of view of the managers themselves. Furthermore, we are dealing with the issue of the extent to which stressful situations affect the quality and efficiency of the work of managers and we are looking for the main causes of stress in the manager’s work. At the same time, we address the possibilities of managing stress, eliminating stress in the work environment, and streamlining workflows in the form of stress stimuli. Last but not least, we have focused on identifying the level of management stress management to support the management of the stresses in organizations where individual managers operate.
DOI:
Typ:
Článek v odborném recenzovaném periodiku cizojazyčně

Autoři:
doc. Ing. Bc. Vladimír Socha, Ph.D.; Socha, L.; Ing. Lenka Hanáková, Ph.D.; doc. Ing. Andrej Lališ, Ph.D.; Koblen, I.; Ing. Stanislav Kušmírek, Ph.D.; Mrázek, P.; Soušek, R.; Schlenker, J.
Publikováno:
2016, International Review of Aerospace Engineering, 9 (5), p. 162-172), ISSN 1973-7459
Anotace:
Flight simulator utilization for basic types of pilot training is restricted by regulations. Flight simulators could contribute to improvements of training quality, especially for initial training to obtain pilot license and, last but not least, to increase flight safety. The goal of this study was to evaluate flight simulator usability for basic piloting technique training. For this purpose, piloting error rate for 35 subjects was evaluated. Within prescribed, continuous flight simulator training consisting of 11 flight hours, progress in piloting precision was monitored during four different manoeuvers. The paper further evaluates influence of the transition between simulated and real flights with regard to progress or regress of executed manoeuvers precision. The results indicate, that during basic pilot techniques training on flight simulator, continuous and statistically significant decrease of error rate during standard manoeuvers execution is achieved. For acquisition of the habits related to mastering basic piloting techniques, the current possibility to use 5 training hours on flight simulator is insufficient. Habits acquisition is noticeable first during 11th flight simulator hour. The study also indicates that the acquired flight simulator habits related to piloting precision applying basic piloting techniques are not observable during the transition to real flights.
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Typ:
Článek v periodiku excerpovaném databází Scopus

Autoři:
Ing. Stanislav Kušmírek, Ph.D.; Hána, K.; doc. Ing. Bc. Vladimír Socha, Ph.D.; Průcha, J.; Kutílek, P.; Svoboda, Z.
Publikováno:
2016, European Journal of Physiotherapy, 18 (4), p. 237-244), ISSN 2167-9169
Anotace:
The main tools for measuring postural instability of the body during quiet stance are stabilometric platforms. Frequency domain analysis of center of pressure excursions is used for detecting and quantifying specific diseases. The disadvantage of such platforms is their higher price and large dimensions. The main aim of this work was to identify the applicability of the frequency domain analysis of the trunk acceleration measured by one-axis accelerometer. In order to test the new technique, 10 patients with degenerative cerebellar ataxia and 11 healthy subjects were chosen to participate. The trunk acceleration of each subject with opened/closed eyes was measured during quiet stance on a firm/foam surface. The distribution of the power spectral density in the frequency spectrum of acceleration in the anterior–posterior direction is a suitable tool for quantifying postural instability. The percentages of the area under the power spectral density curve of middle frequency range (2.4–3.5 Hz) of acceleration in patients and healthy subjects were compared, and significant differences were found. The finding of our research is that a single cheap one-axis accelerometer placed on trunk to measure the acceleration in AP direction, together with the method based on the power spectral density of acceleration, could be a new tool for examinations of body instability.
DOI:
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Článek v periodiku excerpovaném databází Scopus