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The issue of longitudinal safe distance between vehicles
Zemánek, Lukáš ; Prnka, Jiří
This technical article deals with the issue of observance of the longitudinal safe distance between vehicles. It contains an analysis of car accidents on roads in the Czech Republic, in respect of car accidents caused by nonobservance of the safe distance. It also deals with the legislative requirements for observance of the safe distance and at the conclusion is accomplished an analysis of observance of the longitudinal safe distance between vehicles (cars, vans and trucks) on D1 highway under various conditions.
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Driver’s behavior while passing through pedestrian crossing analysis
Kledus, Robert ; Semela, Marek ; Maxera, Pavel ; Kunovský, Martin ; Křižák, Michal
The article deals with analysis of 8 drivers’ behavior while driving through pedestrian crossing during dusk and night. Monitored vehicle passes through modern crosswalk in urban area that is marked with horizontal and vertical road signs. The crossing is illuminated from left side from the direction of travel. Pedestrian is protected with safety island, which is marked with “passing on the right” mandatory sign, in the middle of the road. Optical reactions on various stimuli are monitored while driving with the help of the specialized device Viewpointsystem®, GmgH for monitoring changes of driver’s viewing angle. Drivers’ behavior strategies when passing the crosswalk are compared in this thesis. Monitored are driver’s navigation while driving and his reaction on the crossing pedestrian. Dangerousness of each driving situation is assessed and each strategy is evaluated. Results of this analysis are based on extensive driving tests that were realized in close cooperation of Institute of Forensic Engineering, University of Technology in Brno and research institute EPIGUS – Institut für ganzheitliche Unfall- und Sicherheitforshung from Austria in year 2010.
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Analysis of Drivers' Responses to Complex Stimuli
Kaplánek, Aleš ; Ptáček, Petr (referee) ; Němejc, Jiří (referee) ; Kolíbal, Zdeněk (advisor)
This paper deals with the preparation, implementation, and basic assessment of the motorists’ response times to simple optical and complex – other than optical - stimuli. Driving tests conducted partly under regular traffic conditions and partly on a test track are completed with findings on how drivers react when they use their phones during driving. Knowledge of the actual technically achievable reaction time is necessary in performing analyses and consequent assessments of the causes and developments of road traffic accidents.
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Analysis of Internal Vehicle Noise and its Influence on Active Safety
Dolejský, Lukáš ; Bradáč, Albert (referee) ; Panáček, Vladimír (advisor)
Thesis is focused on the impact of the inside noise of the car on conditional driver safety, which is presented by reaction times on simulated stimulus. In introduction, there is a theoretical definition of the security of the vehicles, inside noise, and its methods of measurement. Practical part consists of description and realization of the measurements of the impact on the inside noise in the car on reaction time of drivers. Conclusion includes evaluations of the measurements and findings, which results from them.
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Power supply
Matějů, Jan ; Uher, Miroslav (referee) ; Beneš, Petr (advisor)
This work is focused on development of a laboratory power source with low output ripple, its construction and measuring its basic parameters. Basic point of interestion is systems design of a digital controled power source. Document describes problems which has occured and its solutions. Describes designing of a circuit board, its construction and measuring its parameters. Below describes system design, construction and examination of a display and keyboard for operating the device. As a result of this work is realized and measured system design, which achieved relativem low levels of output ripple, short reaction time on change of load, but slower reaction of a current limit. Some parameters has not been entirely fine-tuned, especialy speed of reaction of current limit, amplitude of output distortion volage and stability diring short circuit on output clamps.
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Testing of Transformer Differential Protection
Judas, Jan ; Těžký, Jiří (referee) ; Orságová, Jaroslava (advisor)
My bachelor thesis deals with the protection of a transformer, the main focus of the thesis is the differential protection of a transformer, the principle of its function, stabilization and the operating characteristic. I suggested a way of measuring the operating characteristic of the protection SPAD 346 C (developed) by ABB company. As far as measurement is concerned, I used the testing device TZO3, which was, as well as the tested protection, configurated by a computer, into which the results of single measurements were put. The testing was performed via a kind of a test known as ,,TREND“ test for 3 various configurations of operating characteristic of protection and each measurement was scaled for 2 different ,,TREND“ testings. Two marginal operating characteristics were configurated and the third characteritic was configurated approximately between 2 marginal configurations . An error in the calculations of measurement was shown. Since there were two ,,TREND“ tests of steepness performed, there was a calculation of reaction time of protection conducted/performed as well.. All measured and calculated data were processed to graphs in order to illustrate differences among single measurements. I also provided explanations and calculations of possibilities of elimination of increase of electric current within reaction time of protection at steeper increase of ,,TREND“ test.
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Association Experiment upon Students of Economics
Srnková, Denisa ; Krejčová, Kristýna (advisor) ; Krpálková Krelová, Katarína (referee)
This working paper is focused on association experiment created by C. G. Jung, which I transformed into my bachelor thesis based on word association from school area. In theoretical part, I am dealing with core principals, fundamentals, usage, and history of the experiment. In practical part, I am dealing with the experiment itself. My research is mainly focused on students of University of Economics, Prague, who have previously finished high school with economic specialization. I compared this essential group with boys/men and girls/women from different age and non-economic specialization. In the same time I tried to render reaction words. In conclusion of my bachelor thesis I summarized discovered findings and its practical usage.
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Effect of alkohol on the change of reaction time.
ŽIŽKOVSKÝ, Martin
This thesis deals with the theoretical part of the explanation of basic terminology, defines alkohol, partitioning and describes the reaction time. The practical part is devoted to a comparison group of homogeneous reaction time after drinking alcoholic beverages descriptive method. Based on these data, the comparison can evaluace how much influence alkohol has on the human reaction in practice.
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Reaction time of sports horses.
KERNEROVÁ, Nina
In this thesis were charted information and methodology about reaction time of horses on optical stimulus. As an optical stimulus was used vehement and unforseen movement by white board (500 x 500 mm) on which horses reacted very well. Reaction scanning was made by high-speed video camera MotionScope 9400, which was connected to a computer. In total was evaluated group of 35 horses. The average age was 5.8 years, the average reaction time on optical stimulus was 152 ms. In experiment was group of 14 thoroughbreds and 21 warmbloods. Group contained 4 stallions, 17 geldings and 14 mares. The largest group was represented by 5 years old (10 representatives). By the thoroughbreds was found out reaction time 154 ms, by the warmblood group 150 ms. Differences between breeds were not statistically significant. The lowest average reaction time was measured out by stallions (139 ms), then mares (149 ms) and the highest rate was by geldings (157 ms). The difference between reaction time of geldings and mares was not statistically significant. The lowest rate was measured out by the age group from 2 to 4 years old (142 ms), then group of 6 to 13 years old (156 ms). The highest rate had group of 5 years old (159 ms). The differences between age groups were not upholded as statistically significant. The correlation coefficient expressing relation between age of horses and reaction time on the optical stimulus was found out very low, that means that it is not statistically significant. In this thesis was proved, that as well as humans, horses react more quickly on acoustic stimulus than on optical stimulus.
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