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Modelling of the low-velocity layer in seismic prospection
Procházka, Jan ; Fischer, Tomáš (advisor) ; Skopec, Jiří (referee)
The subject of the thesis is to compare layered model and tomographic model. These models are used for description of low velocity layer in seismic survey. The goal of the work was to find out the conditions whether to prefer tomographic model instead of layered model. Program Geostar was used for modelling of low velocity layer. This program is a part of software package produced by CGG Veritas company. Geostar is available at department of Applied Geophysics for study purposes. Four synthetic models were created for comparison of tomographic and layered models. Models of low velocity layer were computed for layered an tomographic model in Geostar environment. Original models were compared to created models. Accuracy was estimated on root mean square error and static correction which was exactly known. In all cases, layered model showed better results then tomographic model. 1
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Catalytic and Electronic Properties of Redox-Active Metalloenzymes and Transition-Metal Complexes: Insights from the Computational Chemistry.
Srnec, Martin ; Rulíšek, Lubomír (advisor) ; Himo, Fahmi (referee) ; Papai, Imre (referee)
Charles University in Prague Faculty of Science Department of Modeling of Chemical Properties of Bio- and Nanostructures Catalytic and Electronic Properties of Redox-Active Metalloenzymes and Transition- Metal Complexes: Insights from the Computational Chemistry Dissertation Thesis Abstract RNDr. Martin Srnec Supervisor: Mgr. Lubomír Rulíšek, CSc. Institute of Organic Chemistry and Biochemistry AS CR Center for Biomolecules and Complex Molecular Systems Praha 2010 Introduction Metals and their ions play a key role in maintaining life. They frequently promote protein folding, the stabilization of protein scaffolds, enzymatic activity, energy conversion, intra- and intercellular signals etc. Several decades ago, metalloproteins were considered as a rather small group of proteins. Nowadays, one-third of enzymes are estimated to contain one or more metal ions, whose presence is crucial for their enzymatic functionality. Metalloenzymes participate most often in the catalysis of difficult chemical reactions (e.g. the hydroxylation of methane, decomposition of H2 into protons and electrons, N2 and O2 bond cleavage and many other examples), in oxidation-reduction and electron-transfer reactions, and in the catalysis of spin-forbidden reactions, where relativistic effects (i.e. spin-orbit coupling) are necessary....
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Modelling of terrain and its modifications
Danihelka, Jiří ; Vaněček, Pavel (referee) ; Kolingerová, Ivana (advisor)
This thesis is about intuitive terrain modeling for needs of computer games. The thesis is searching for a method of terrain modeling that will be easy for people with lack of experience. The method also should be able to allow powerful modeling techniques for professionals game creators. The thesis debate about choosing appropriate method and compare different methods between each other. Selected is the method of moving control points of Bezier patches. The thesis presents a program Terrain Editor that was created as part of the thesis. The program implements selected method and demonstrates its use in practice.
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AI Planning with Time and Resource Constraints
Dvořák, Filip ; Chrpa, Lukáš (referee) ; Barták, Roman (advisor)
Automated planning plays an important role in many fields of human interest, where complex and changing tasks involve demanding efficiency and error-avoidance requirements. Research in planning is also motivated by capturing the computational aspects of Artificial Intelligence, where planning, being a reasoning side of acting, is one of the key elements. Introduction of time and resources into planning is an important step towards modelling problems from the real world, however planning is generally hard and introduction of time and resources makes it even harder. In this thesis we explore theoretical aspects of planning, temporal reasoning and resource reasoning. Based on these studies we develop our own suboptimal domain-independent planning system that focuses on planning, where time plays a major role and resources are constrained. We test the developed planning system on the planning problems with time and resources from the International Planning Competition 2008 and compare our results with the competition participants.
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Cell shape simulation using cytoskeleton model
Horáček, Jaroslav ; Bílý, Tomáš (referee) ; Bálek, Martin (advisor)
This work is focused on computer modelling of cells' behavior. Emphasis is layed on simulating of cell shaping. The goal is to design theoretical structure, which suitably represents cytoskeleton of cell. Our model is based on Zygotic graph. It defines cell reactions to incoming stimulation from environment. Unlike previous models we newly add Fill graph and Granary graph to the Zygotic graph. In order to modelling of cell shaping we define membrane flexibility. We also define mechanism of Cytoplasmatic pulse. It is necessary for amoeboid movement modelling. We added new structure called Granary, which represents storage ability of cell. We use our model to simulate movement of amoeba cell. Another example shows white blood cell moving through blood vessel wall. We also attempt to simulate growth of cells inside closed environment.
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Systém pro polo-automatickou 3D rekonstrukci scén
Mach, Lukáš ; Sedláček, David (referee) ; Buriánek, Jan (advisor)
Image-based modeling o ers a way to create precise 3D reconstructions of existing scenes based on their photographs. We describe essential results from projective geometry and computer vision necessary to perform such reconstructions, investigate how sparse feature matching algorithms can be used to help the user in creating the scene more easily and implement a fully functional open source software solution.
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Benefits of dynamic contrast ultrasonography for differential diagnosis focal liver lesions
Ungermann, Leoš ; Eliáš, Pavel (advisor) ; Mechl, Marek (referee) ; Mírka, Hynek (referee)
5 3. Summary Purpose: To evaluate the clinical utility of contrast enhanced ultrasonography (CEUS) for the characterisation of focal liver lesions with the emphasis on the benign entities. Our aim was to find out the accuracy of CEUS to differentiate between the malignant and benign lesions and to extend the knowledge about the typical signs of solid benignomas on CEUS. Material and methods: our material consists of 163 liver masses observed in 144 patients. The final dianosis has been stated by means of the computed tomography in 26.4 %, magnetic resonance imaging (60.4 %) and histology (25.8 %). There was a majority of women (n=90) against men (n=54); the average age was 47.6 years. The number of benign lesions (n=137) markedly exceeded the number of malignant ones (n=6). The dominant lesions were hemangiomas (n=66), the second most common was focal nodular hyperplasia (FNH, n=42). The other lesions comprised of limited numbers of entities(focal steatotic or nonsteatis regions: n=21, metastatic lesions: n=15, hepatocelullar carcinoma, n=7, regenerative nodular hyperplasia, n=5, peripheral cholangiogenic carcinoma, n=4, and others - inflemmatory pseudotumour, adenoma, epithelial angiomyolipoma). Results: The accuracy of CEUS for the differentiation of malign or benign lesion was 95, 7 %. Regarding the...
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