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Plánování cesty pro čtyřnohého kráčejícího robota použitím rychlých náhodných stromů
Krejsa, Jiří ; Věchet, S.
Summary: There are several randomized methods for problem of path planning. Rapidly exploring random trees (RRT) is a method which can deal with constraints typical for legged walking robots, e.g. limitations in rotation step resolution. Paper describes the RRT method itself and its use for path planning of four-legged walking robot, including special failure case when robot is capable of only rotating in one direction. The method proved to be robust and fast.
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Loading of bridges and accumulation of fatigue damage
Rieger, M. ; Marek, Pavel
The article presents discussion and recommendation in connection with influence and evaluation methods of bridge loading events. Newly, according to Eurocode 3, two reliability concepts may be considered: damage tolerant concept and safe life concept. Fatigue life assessment may be based on fully probabilistic concept, too. The loading as well as response history should be taken into consideration and a fatigue criterion, based on the stress-range concept, should be applied. Crack grown may be modeled using LEFM procedures, initial crack size ai may be determined as input random variable with log-normal distribution.
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Psychological aspects of gambling and realted consequenses
HŮDOVÁ, Veronika
Psychological aspects of gambling and the consequences associated with this problem My thesis deals with psychological aspects of gambling and the consequences associated with this problem. The research was focused on regular casino visitors, but partly also to gamblers who have already decided to treat their addiction. The theoretical part is divided into 8 subchapters, in which basic terms concerning gambling are mentioned, for example: definitions and categorization of the terms gambling and pathological gambling, a list of possible causes of the addiction origination, characteristics of risk groups, individual forms of gambling, the development of addiction, the addiction treatment and the possibility of a social worker intervention. The purpose of my study was to identify and analyze the motives for gambling with regard to the quality of life, with a special attention to social aspects and possibilities of a social worker intervention. In relation to the objective of the thesis four hypotheses were stated, for verification of which quantitative research was used. The interviewing method by means of a structured questionnaire was selected. The analysis of the conclusions enabled to verify the defined hypothesis, which says, that playing of hazardous games has a negative effect to level of psychological mood of the human being. Another stated hypothesis supposing that gambling causes economic, social, family and work problems has not been confirmed by the research. The following hypothesis presuming that a random winning encourages the gamblers to continue playing has been confirmed by a vast majority of respondents. And the last hypothesis, in which is defined the presumption, that the level of life quality is related to grade of pathological gambling, was also confirmed. The results of my work may be used in education or as information for social workers. Based on the findings on the issue of pathological gambling I suggest to focus on prevention of development of this dangerous addiction.
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Random walk and game theory
Vondrušková, Ivana ; Malá, Ivana (advisor) ; Novák, Ilja (referee)
A random walk is a mathematical formalization of a trajectory that consists of taking succesive random steps. The results od random walk analysis have been applied to computer science, economics, biology tec. This thesis is concentrated on connection between random walk and games theory especially with thinglering simulation. The application part of this thesis is focused on game strategies, that determine the amount of bet in next game.
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Modeling Moldova
Cincibuch, M. ; Kejak, Michal ; Vávra, D. ; Auda, O. ; Aslanyan, Gurgen ; Baksa, D. ; Bečičková, Hana ; Daniš, P. ; Hřebíček, Hynek ; Janjgava, Batlome ; Kacer, R. ; Kameník, O. ; Konopecký, F. ; Lukáč, J. ; Mirzoyan, Armen ; Motl, Tomáš ; Musil, K. ; Plotnikov, S. ; Remo, A. ; Szilágyi, K. ; Vlček, J.
The report has two chapters. Chapter 1 describes the structural model which lies at the heart of the FPAS. It summarizes the main features of the Moldovan economy relevant for building the structural model and describes in detail the most distinctive parts of the model. The chapter concludes with an analysis of the model properties and an interpretation of past economic developments in Moldova through the lens of the model. Chapter 2 evaluates how the FPAS performs empirically. The forecasting power is assessed by in-sample comparison with the standard random-walk benchmark. We conclude that the FPAS performs satisfactorily in this comparison.
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Duály a zúžení procesů přibuzných kontaktnímu procesu
Swart, Jan M.
This paper considers contact processes with additional voter model dynamics. For such models, results of Lloyd and Sudbury can be applied to find a self-duality, as well as dualities and thinning relations with systems of random walks with annihilation, branching, coalescence, and deaths. We show that similar relations, which are known from the literature for certain interacting SDE's, can be derived as local mean field limits of the relations of Lloyd and Sudbury.
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