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Geolocation in Internet using network topologies
Dvořák, Filip ; Verner, Lukáš (referee) ; Komosný, Dan (advisor)
The thesis discusses about modern geolocation methods and it describes the basic principles of their work. The work is divided into 2 parts - the theoretical one and the practical one. The first part of the thesis is focused on the description of these methods and on the explanation of its basic concepts which are used for determining of the physical position of the station according to its IP address. The second more extensive part of the work focuses on the description of the realization of algorithm in the Octant method in the programming language of Java and its use in the experimental net of PlanetLab. One important thing is to create a set of reference points and targets, which are necessary for the testing of the whole algorithm of the Octant Method. The results of estimated accuracy of target location obtained by the Octant method and their comparison with the results obtained by active methods of CBG, SOI and with the passive method of GeoIP are listed at the end of this work.
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Geolocation of Internet hosts
Ingr, Michal ; Müller, Jakub (referee) ; Balej, Jiří (advisor)
This master thesis deals with methods of stations’ geolocation on the Internet, it means the estimation geographic location of unknown station, which is conected to this network. The introductory part describes the methods for determining position, which don‘t need any measeruments of the network. The next section is devoted to points, where delay is invoked, to the causes of latency in the Internet, to their types and some usual values. The following part features ways to measure delays and route, including several tools for this purpose. The penulminate section describes some chosen geolocation techniques based on RTT measurement. The final chapter is devoted to practical demonstration geolocation using the CBG method, when the delay measurement was carried out in an experimental PlanetLab network.
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Location estimation of Internet nodes
Němeček, Ladislav ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
This paper deals with methods of stations’ IP geolocation. It’s describes the methods of passive and active geolocation and it’s more focused on active searching methods, which usees measuring the latency in network. The factors causing delays in data transfer are discussed first, followed by discussion of the issue of measuring these delays. After that a brief description of PlanetLab experimental network, which nodes were used for delay measurment. Main topic is practical implementation of method Constraint-based Geolocation in Java programming language. Last but not least the measurement results of CBG algorithm are tested.
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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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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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Perspective bus powertrains
Kubík, Jan ; Maršálek, Ondřej (referee) ; Píštěk, Václav (advisor)
The aim of this thesis is to consider possible future development of alternative powertrains with regard to their use in buses. First described are the most promising alternative fuel vehicles, which use an internal combustion engine. The next part is evaluated ways to store energy using electric drives. At the end of the work is mentioned hybrid technology as a combination of previous drives.
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Active IP Geolocation for Verification Host Position in Internet
Balej, Jiří ; Róka, Rastislav (referee) ; Zdrálek, Jaroslav (referee) ; Komosný, Dan (advisor)
Dissertation thesis deals with methods for finding the location of the device in the Internet, based on knowledge of the IP address. The process is called IP geolocation and is currently solved by geolocation databases or by measurement of network properties to the IP address. The disadvantage of nowadays geolocation databases is an incorrect information about some locations, because they can be in large distance from correct position. The aim of the thesis is to develop a method for verification of a position from geolocation database using delay measurement. Because of it, there is a detail analysis of influence of partial delays on the distance estimation accuracy, calculated using measured delay between the landmark and the target IP address. For the same reason, long-term delay measurement was performed, where the IP geolocation accuracy was compared using calibration data from previous measurements. On this background, Cable Length Based Geolocalisation (CLBG) method is proposed. Principle of this method is built on the properties of partial delays, which depend on the length of transport media. Firstly, the method measures round trip time (rtt), which is subsequently lowered by intermediate devices and end stations delay. The geographical distance is estimated using signal speed in the transport media. Further, the winding media parameter is established, which is used to determine a constraint around the landmark. The intersection of all constraints defines the area, where the target IP is. The IP geolocation using CLBG gives better results than simpler methods (ShortestPing, GeoPing and SOI), in comparison with more advanced methods (CBG and Octant) the accuracy is similar. The disadvantage of the CLBG method is the size of region, where the target lies, but this is due to its purpose. The position found in geolocation database can be checked by evaluation if it lies in the region.
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Yield and quality of hemp (Cannabis sativa) grown in organic and conventional farming
KAŠPAR, Jan
Hemp is an ancient crop that has a wide range of uses compared to commonly grown crops. The aim of this study was to evaluate the effect of variety and cultivation system on the yield of total biomass, amount of flowers, leaves, achenes and plant waste, the thousand achene weight, the proportion of size fractions of achenes, the proportion of shelled aschenes and husks and the yield of oil. Hemp cultivation can be recommended for organic farming, because hemp plants had significantly the higher weight of female plants and the yield of total biomass in green and dry matter in t/ha both at flowering and at the end of vegetation perod. They also had the higher production of inflorescences and leaves, and the production of achenes. The cultivation systems are comparable in the proportion of coating layers of achenes and the thousand achene weight. The conventional system was significantly better in the proportion of oil in the achenes and the proportion of the size fraction of achenes above 3.5 mm. When comparing the varieties, a higher yield of biomass and achenes was achieved for the variety Santhica 70 from conventional production (Meclov), namely 57.3 t/ha and 1.5 t/ha. The yield of flowers and leaves was higher from organic production (Chlum) in the Fedora 17 variety, namely 3.08 /ha. The higher proportion of oil in hemp achenes was determined for the variety Santhica 70 from conventional production (Sušice) at 16.5%.
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Effects of long-term use of hemp substances
Horynová, Rebecca ; Ondrušová, Jiřina (advisor) ; Krahulcová, Beáta (referee)
The thesis was divided into two parts. The first part deals with selected long-term impacts of cannabis use and basic concepts such as history, methods of application, use or legislation. In order to understand the whole issue, the basic components of the cannabis plant and their effects. The main part of the theory was then devoted to the possibilities of social work in the field of addiction, but also health complications and therapeutic effects of cannabis. The first part was built on a professional basis literature that addresses this topic. As the work dealt with a very current topic, the latest HARP treatment program was also mentioned. In the second part of the work semi-structured interviews were performed in order to confirm the theoretical part of the work and bring a certain authenticity to the work. The goal was to offer to the reader comprehensive information about cannabis in one place, clearly and transparently. The negatives and the positives that this plant can cause as a result of use were analyzed.
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Možnosti využitia technického konope
Balog, Nikolas
ABSTRACT This bachelor thesis deals with the possibilities of using technical hemp. The first part deals with botanical characteristics, morphology and anatomics, content substances. A significant part deals with the yield of cannabis raw materials, their composition and processing in various sectors. In the practical part, it deals primarily with hybridization and cultivation under controlled conditions and other methods such as vegetative reproduction of hemp plants.
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