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Utilization of Wireshark software in Communication technology course
Šíma, Jan ; Langhammer, Lukáš (referee) ; Jeřábek, Jan (advisor)
This bachelor thesis is focused on the issue with protocol set TCP/IP. Specifically it is about protocols ICMP, TCP, DNS, SIP and RTP. Main purpose of this thesis is to create two complex scenarios suitable for laboratory exercises for Communication technology course. The scenarios contain instructions with the solution procedure for students, including additional tasks. The first scenario introduces students to the Wireshark environment. Furthermore, this program is used to analyze captured packets, which were described in the theoretical part of the work. To capture packets of certain protocols, the command line and ping, traceroute, and nslookup commands, including their parameters, are also used in the scenario. The second scenario focuses on the VoIP call analysis, including the restoration of the captured call. The second part of this scenario compares differences between protocols TCP+TLS and QUIC while loading the secured web page. Both scenarios were tested in a school laboratory, where the scenarios are developed in a virtualized operating system. Also, each scenario contains additional questions for students and for teacher there is prepared a file, which contains the correct answers.
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Synthesis of the electronically reconfigurable frequency filters
Michalička, Filip ; Dvořák, Jan (referee) ; Langhammer, Lukáš (advisor)
This diploma thesis deals with design of reconection-less electronically reconfigurable filter structures which have single input and single output using unconventional active elements, which have ability to adjust one of their parameter e.g. gain or transconductance. The first part describes basic parameters of frequency filters, the division of filters by frequency transfer response and used circuit elements, their operational modes, the principle of reconnection-less electronically reconfiguration and the circuit design method MUNV. Second part describes all active elements used in the proposal of filters, their properties and the implementation using existing transistor-level models. The third part contains the design of three reconnection-less electronically reconfigurable filters and the simulations results obtained from simulation programs OrCAD Capture and PSpice. The obtained results were compared with theoretical behaviour. This part also contains results of these analyses: sensitivity, parasitic, Monte Carlo and temperature to determine the behaviour in varied cases.
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Laboratory exercises explaining the principles of network technologies and protocols
Hricko, Tomáš ; Jeřábek, Jan (referee) ; Langhammer, Lukáš (advisor)
The aim of this diploma thesis is to create two exercises for students. The first exercise is concerned with comparison of transport protocols TCP and UDP. The second exercise is concerned with comparison of routing protocols OSPF and RIP. The first part describes used simulation environment. The next part describes the operating system used in routers. The following part describes the procedure of installing virtual machines. The next part consists of theory of protocols TCP, UDP, OSPF and RIP. The last two chapters are the laboratory exercises.
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Laboratory exercises explaining network technologies and protocols
Coufal, Tomáš ; Dvořák, Jan (referee) ; Langhammer, Lukáš (advisor)
Diploma thesis deals with creation of laboratory exercises in ns-3 environment. Each one of three exercises consists of theoretical introduction and instructions to carry out the simulation. The first exercise´s topic is routing protocol BGP. The second exercise is focused on transport protocols TCP, UDP, SCTP. In the last exercise, the basic network devices and topologies are simulated. The ARP and RIPv2 protocols are simulated as well.
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Laboratory exercises for network technologies education
Kapusta, Martin ; Langhammer, Lukáš (referee) ; Dvořák, Jan (advisor)
The aim of the diploma thesis is to choose network simulator suitable for network technologies laboratory tasks for educational use. Theoretical part of thesis describes basics of network communication, addressing, reference models. Thesis also describes standards Wi Fi, Ethernet and routing protocol OSPF - technologies which are discussed in laboratory tasks. The practical part of diploma thesis describes a few available network simulators suitable for creating two laboratory tasks. Finally, the NS-3 simulator was chosen. Both laboratory tasks include theoretical introduction, detailed description of source code, individual tasks, expected outputs and control questions which senses understanding of discussed technologies.
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3D reconstruction of abandonned ponds using UAV photogrammetry
Stanovský, Tomáš ; Langhammer, Jakub (advisor) ; Blahůt, Jan (referee)
The main focus of the thesis is the reconstruction of 3D models and digital elevation models of five abandoned splash dams in Roklanský brook catchment using UAV photogrammetry methods. The aim of this work is to compare accuracy of the models with available conventional data sources and historical sources. Parallel topic is the research of accuracy of the models created through UAV methods and application of retention potential of small water reservoirs, in headwater areas. The images were taken with a drone-mounted camera. Modelling was done by processing images in software Agisoft PhotoScan through a workflow process, dense point cloud classification and subsequent DEM interpolation. Subsequent delineation of reservoirs retention space, altimetry correction and bathymetric analysis was performed in ArcMap over the interpolated DEM. The results and discussion point to the benefits and limitations of UAV methods, especially to altimetric accuracy of the resulting models relative to conventional DMR5G data and bathymetric characteristics derived from the models. Keywords: UAV; DEM; retention; GIS; model; pond
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Adjustable Fractional-Order High-Pass Filter with Transconductance Amplifiers
Dvořák, Jan ; Langhammer, Lukas
This paper deals with proposal of a fractional-order high-pass filter with electronically tunable pole frequency and its order. The filter is designed using operational transconductance amplifiers (OTAs), current follower (CF) and adjustable current amplifiers (ACAs). Function of proposed filter was verified using simulations in PSpice simulator. The circuit features were verified in simulations for three values of order of the filter and four values of cut-off frequency. In this paper, possibility to tune the cut-off frequency using the values of passive components is also mentioned.
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Laboratory scenarios describing DNS system
Sakala, Peter ; Langhammer, Lukáš (referee) ; Jeřábek, Jan (advisor)
The master’s thesis deals with Domain Name System (DNS) and its practical use. It describes hierarchy of domain names, resource record types, protocol used, as well as DNSSEC extension. The most utilized implementations of authoritative and recursive DNS servers are presented. Virtualization, containers and other tools with potential use in labs are described. Two lab scenarios in virtualized environment with instructions for students were designed and developed in this thesis.
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Modelling of the overland flow in an extreme shaped relief
Fárek, Vladimír ; Langhammer, Jakub (advisor) ; Zezulák, Jiří (referee) ; Unucka, Jan (referee)
This thesis is focused on finding the optimal tools for modelling of the overland flow and verification of its reliability and limits in an extreme relief of the Bohemian Switzerland. This paper focuses on the Open Source tools for modelling of the overland flow implemented in the geographic information system GRASS GIS. The region of the Bohemian Switzerland, especially of the same name national park, was chosen for two main reasons. The first is the fact that the range of reliefs' shapes of local sandstone rock areas is exceptionally varied. Extreme vertical segmentation, relief edges, changes of convex and concave shapes of relief, significant changes of profile, planar and tangential curvature and often extremely narrow and deep valleys are extremely difficult from the point of view of overland flow modelling. The second reason for the focus on the above mentioned field is the fact that for the given area there is available an exceptional quality digital elevation model (DEM) from the GeNeSis project - "Geoinformationsnetzwerke für die grenzüberschreitende Nationalparkregion Sächsisch - Böhmische Schweiz". This DEM financed from the operational program EU Interreg IIIA Cross-Border Cooperation was carried out by the Technical University Dresden and is characterized by high density of scanning...
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