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Evaluation of E-learning Tools
Šnajdr, Pavel ; Smutný, Milan (referee) ; Kopecká, Jana (advisor)
Náplní semestrální práce "Evaluation of E-learning Tools" je přiblížení e-learningových nástrojů čtenáři a zhodnocení možností využití e-learningu jako samostatné složky výuky. První část práce se zabývá definováním termínu e-learning a poskytuje zasazení do historického pozadí. V dalších částech se blíže zabývá jednotlivými hardware a software nástroji. E-learningové nástroje, kterými se práce zabývá, jsou základní kancelářské nástroje, stránky pro sdílení videí s výukovým obsahem a v poslední části sociální sítě a jazykové programy a zhodnocení výhod, nevýhod a vlivu na studenta.
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Detection of Peer-to-Peer Communication
Letý, Pavel ; Kováčik, Michal (referee) ; Bartoš, Václav (advisor)
This thesis is focused on issues in detection of P2P network from NetFlow. In the theoretical part of this work are introduced actual techniques in detection of this communication in network. There are presented their advantages and disadvantages too. The biggest attention is focused on the classification scheme of Mr. Bashir which deals with a detection of a protocol BitTorrent and a Skype application from Netflow. Following this scheme is designed a detection module for a modular system of a traffic analysis Nemea, developed by Cesnet organization. In the practical part of this work is introduced the implementation of this module. There are also presented results of experiments with real data.
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Detection of Dynamic Network Applications
Juránek, Michal ; Kaštil, Jan (referee) ; Tobola, Jiří (advisor)
This thesis describes methods of detection of simple voice communications of encrypted VoIP calls between two Skype clients. The elements of network and its communication principles are described. Three approaches to classification are analyzed. The first approach performs the classification by content of network packets using Pearson's chi2 test of goodness of fit, the second approach by characteristics of network flows by means of naive Bayesian classification. The third approach describes ways of detecting signaling messages. The detector application is implemented on the basis of chosen methods.
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Identifying Skype Traffic Using NetFlow Data
Šebeň, Patrik ; Veselý, Vladimír (referee) ; Grégr, Matěj (advisor)
NetFlow is a network protocol commonly used for collectiong IP traffic information. But there is a way to use this collected data for indentifying clients in Skype communication. This paper describes identifiable patterns in Skype protocol and how to find them in NetFlow data. This way we can identify nodes and supernodes in Skype network.
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Implementation of Asterisk VoIP PBX
Schön, Martin ; Münster, Petr (referee) ; Szőcs, Juraj (advisor)
The thesis is divided into two parts, theoretical and practical. In theory, it analyzed the signaling protocols, the RTP protocol for data transmission, VoIP Asterisk PBX and security options. The practical part describes the installation of the Asterisk PBX, conducted demonstration call forwarding. PBX was associated with an LDAP directory server to manage users and ejabberd for text messaging protocol XMPP. It was configured translation SIP-Skype using the SiSky Gateway and with dialplan SIP-H.323 translation. The study was to develop Dialplan with IVR. It was measured bandwidth of the audio/video codecs in an encrypted/unencrypted connections.
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Speech signal transmission over unreliable networks
Rozman, Jiří ; Krajsa, Ondřej (referee) ; Polívka, Michal (advisor)
This thesis deals with analysis of internet telephony. It is fosuced on analysis of VoIP over metalic and wireless network using virtual telephonic switch-board with hardware and software phones and also alternative programs to transmit voice such as Skype and Windows Messenger. It also deals with simulating parameters that influance voice transmission like jitter, latency packet loss. WANem system was used for this simulation. In the end it is focused on the problem of providing flawless voice communication over internet, specially providing Quality of Service.
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Location of VoIP caller in emergency
Mrník, Martin ; Krajsa, Ondřej (referee) ; Komosný, Dan (advisor)
This master thesis deals with the problem of localization of the caller to the emergency line with focus on VoIP calls. It contains general description of the main active and passive geolocation methods, and explains their function. The paper analyzes market share of different VoIP clients and describes the program Skype. The focus of this work is to create an application for geolocation of the caller using analysis of VoIP transmission. The application gains IP address of the caller by capturing packets and displays his/her location on the map. The coordinates are obtained from the MaxMind GeoLite City database which been chosen by evaluating objective parameters as the most suitable for desired use.
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Computer tools for customer acquisition
Terletska, Svitlana ; Topolová, Ivana (advisor) ; Koubalíková, Jitka (referee)
Based on real company and real data the aim of this work is to establish computer tools that are most effective for new customers acquisition. CRM system has been used as a tool to determine the results and calculate the sales funnel of the company. This bachelor work is focused on theoretical and practical processing issues. Conclusion contains a summary of the work and the author's recommendations for the company.
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The use of social networks and communication channels in work enviroment
Hrušková, Hana ; Kašparová, Eva (advisor) ; Chládová, Martina (referee)
As the title says, this bachelor thesis deals with the use of social networks and communication channels in work environment. The goal is to describe the most known social networks and their possible use and misuse in a business. The practical part of this work consists of interviews with representatives of two companies using Skype as an official communication channel and public inquiry about current trends in using of social networks and communication channels in work environment
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VoIP- IP network voice communication
BERAN, Václav
The possibility for using the VoIP technology as an alternative solution for the te-lephone system is very attractive. The main reason is the widely expanded computer sites and also their higher effectiveness. The main goal of the work is to describe the VoIP technology and create the first publication in Czech republic which deals with this theme in details. First of all I concentrate on the explanation of the basic words, conceptions and principles necessary to fully understand the whole field. The main scope of the work is VoIP technology which is described in third chapter. There are described also the methods of voice coding, signalling protocols (SIP, H.323, MGCP, IAX) and issues related with QoS. The work also covers the Skype program with descriptions of it's principles, installation and control.
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