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Estimation of the IP station location based on the parameters of network traffic
Ripper, David ; Komosný, Dan (referee) ; Verner, Lukáš (advisor)
This bachelor’s thesis covers the topic of evaluation of the geographical location of stations on the Internet with the help of measurements of the delay and implementation of the CBG method, which embodies both theoretical and practical parts of the bachelor’s thesis. The first part of this thesis is dedicated to passive geolocation methods, types of delays in data network, and their subsequent measurement. The second part pursues active geolocation methods, specifically the CBG method. Aim was to program a localization algorithm in the programming language PHP, subsequently evaluate accuracy of the method and compare with available methods IP geolocation.
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Localization of IP stations based on model of probability delay measurement
Tropp, Peter ; Komosný, Dan (referee) ; Verner, Lukáš (advisor)
The master thesis is dealing with Internet host localization methods, more exactly with determining geographical position of the unknown Internet host connected to the network using RTT delay measuring. The first part is dealing with description of RTT delays that may occur in the network and tools for their measurement. The next is part of thesis is devoted to description of two kinds of localization methods. Ones that are using existing data to determine the position of Internet host also called passive methods, and others that are using RTT delay measurement, also called active methods. The main part is focused on GeoWeight method which is based on geographical localization estimation of Internet host. It is based on RTT delay measurement using the principles of CBG method, enhanced by introduction of the theory of weights according to the probability of the target Internet host. The last part is describing the application that was made to determine the geographic localization of the target Internet host using GeoWeight method. The application was afterwards tested by measuring RTT delay in PlanetLab experimental network. At the end the final measured results were compared with other localization methods (CBG, Octant, SOI, GeoIP).
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Semi-automated Design of High-performance Digital Circuits with Xilinx FPGAs
Houška, David ; Dvořák, Vojtěch (referee) ; Šťáva, Martin (advisor)
Tato diplomová práce se zabývá návrhem sekvenčních digitálních obvodů s ohledem na optimalizaci zpoždění. V práci je popsána problematika dvou technik, které jsou běžně používané při optimalizaci – stručně je popsána technika tzv. synchronizace registrů (angl. retiming), větší pozornost je však věnována technice tzv. zřetězení (angl. pipelining). V rámci praktické části byla vypracována forma abstrakce sekvenčních digitálních obvodů pomocí acyklických orientovaných grafů. Obvod je tak přenesen do roviny, ve které je jednodušší jej transformovat. Zároveň je představen nástroj pro polo-automatickou optimalizaci digitálních obvodů vyvíjených v prostředí Xilinx ISE Design Suite využitím techniky zřetězení.
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Geolocation of Internet nodes based on communication latency
Horák, Michael ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
This thesis covers the topic of determination of geographical location of a host in internet network while utilizing measurement of the end to end delay and implementation of Constraint-Based Geolocation. Gradually I go through issue of the delay in computer networks and ways how to measure it. Next chapter describes a few ways to geolocate host in internet network with emphasis on the CBG method. Another chapter is dedicated to describing a way to project spherical coordinates to the two dimensional space, which has been used in implementation of geolocation method. Chapter about implementation builds upon the facts given in previous chapters while functions of the program written in the JAVA programing language are being explained. Two similar geolocation methods were implemented. By comparing the results gained by implementation, new method of geolocation is proposed and devised. It combines properities of both previous methods. There are results of the implemented methods and their comparation to the one of the source documents used in creation of this thesis in summary section.
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Analysis of the effect of delay and window size on TCP connection efficiency
Kavický, Martin ; Komosný, Dan (referee) ; Molnár, Karol (advisor)
Content of master’s thesis is description field of Sliding window and it’s expansion algorithms, witch are Slow start, Congestion avoidance, Fast Retransmit and Fast Recovery algorithm. Thereinafter is described creation of model in Opnet Modeler’s simulation area. In this simulation area was analyzed reactions of average transfer speed onto variance of data size, lost ratio, latency in short and long time slot and variance of receiver’s buffer size. In last section of this document is method design witch makes it possible of transfer speed control through the use of receiver’s buffer size dynamic setting.
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Simulation of data transmission latency between nodes in IP networks
Balej, Jiří ; Molnár, Karol (referee) ; Komosný, Dan (advisor)
This master thesis is focused on the delays incurred in data transmitting over IP networks. The top of the paper is devoted to points, where delay is invoked and causes of the latency. For individual sources of delay are are described the parameters that affect the usual size of latency. The next section describes the types of networks and their typical delay. In the paper are also discussed tools for measuring delay and determining the number of intermediate devices. The thesis contains results of measurements delay time in the real network. For these results are listed conclusions about the delay for one intermediate device. There is also said general ratio of crow-fly distance and calculated distance. The last part deals the simulation of delay in the NS2 program. The results of thesis are scripts that shows the relation of delay and the number of switches, routers, and the length of the path.
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Measurement of communication latency in IP networks
Bednář, Vít ; Vrba, Kamil (referee) ; Komosný, Dan (advisor)
Semestral thesis is focused on measurement of communication delay in networks. There is described creation of individual kinds of delay during the transfer in networks. Tools for measurement of delay are described and web pages are designed and made too. There is measured delay on choose 27 IP address with help of this page.
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Mobile IPv6 handover analysis
Klügl, Richard ; Hošek, Jiří (referee) ; Skořepa, Michal (advisor)
This master’s thesis is focused on IP mobility support for mobile users and their devices in IPv6-based wireless networks. Then the Mobile IPv6 (MIPv6) protocol was proposed for this purpose and that is also the main objective of the thesis. This consists of several basic sections and is organized as follows: The first one deals with the overview of the function of Mobile IP, which enables the mobility of nodes around the Internet, without a change of their original IP address. Moreover there are introduced the primary differences between MIPv6 and its previous version – i.e., MIPv4, proposed for IPv4-based environment. The second chapter of the master’s thesis thereafter describes detailed information about all the most important mechanisms and features of Mobile IPv6 and this way tries to explain principles of its functioning. Further the thesis analyses some of proposed MIPv6 extensions – i.e., Hierarchical Mobile IPv6 (HMIPv6), Mobile IPv6 Fast Handover (FMIPv6) a Fast Handover for HMIPv6 (F-HMIPv6) protocols, and mainly aim at signaling process during the handover of a mobile node. In the last main section of the master’s thesis an analytical method to evaluate the performance of IPv6-based mobility management protocols was proposed. Subsequently, this method is applied on the protocols which were mentioned above and are studied the effects of various network parameters on the performance of these protocols.
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Architectural visualization in virtual reality
Hložanka, Filip ; Rujbrová, Šárka (referee) ; Reich, Pavel (advisor)
Tato práce se zaměřuje na nynější podobu virtuální reality a její využití v průmyslovém designu a architektuře. Je rozdělená do dvou částí. V první částí je popsána historie virtuální reality včetně fází vývoje a nejpopulárnějších produktů. Dále jsou v ní porovnány současné produkty virtuální reality dostupné pro uživatele spolu s technologiemi pro sledování pohybu uživatele a jeho interakce s virtuálním prostředím. Jsou v ní také vysvětleny problémy při zavádění virtuální reality do pracovního prostředí, a nakonec je uvedeno několik příkladů využití virtuální reality v průmyslu. Druhá část se zaměřuje na jednu z těchto možností využití virtuální reality – architektonickou vizualizaci, přičemž je v ní popsána její evoluce, jsou v ní porovnány softwarové možnosti pro její tvorbu a zobrazování, a nakonec je ukázán příklad přenesení reálné místnosti do virtuální podoby. Závěr se zaměřuje na možnosti rozvoje virtuální reality, výsledky porovnání softwarů pro architektonickou vizualizaci a proces tvorby příkladu vizualizace.
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Real time Linux latency analysis
Krajíček, Peter ; Macho, Tomáš (referee) ; Valach, Soběslav (advisor)
The thesis analyzes the causes of delays when using the operating system GNU/Linux. It describes a few selected types of analysis, which then implemented using the C programming language. Itself measurement is made on the kit with OMAP3530 microprocessor and the Linux kernel.
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