Magister Legum - LLM / South Africa

This diploma thesis focuses on the MANET Network (Mobile Ad-Hoc Network). There are theoretically elaborated basic information, the characteristics of the MANET network and great emphasis is placed on routing in these networks. In the next chapter the diploma thesis focuses on the Ad Hoc Demand Distance Vector (AODV) routing protocol. It features the characteristics of this protocol and the principle of communication and routing in MANET networks. Hereinafter, the individual reports of the AODV protocol are described in detail. In the third chapter, the thesis introduces the NS-3 simulation environment (network Simulator - 3) and then deals with the design of the MANET network in NS-3 using the AODV routing protocol. The practical part of the diploma thesis is the MANET network simulation and testing with the AODV routing protocol. Laboratory task is built from these simulations and the results of the testing.

This thesis deals with the front LED headlamps in the automotive industry. This paper describes the supply options and how to control these headlamps. The theoretical part describes the parameters and communication interfaces of the NCV78343 device. The practical part is divided into three chapters. The first chapter focuses on the design of the evaluation platform, the functional blocks and the configuration options. The second chapter deals with the implementation of the control software and the last part shows the measurements that were made on the evaluation board. At the end, obtained results are summarized.

Advancements in technology have brought about a wide variety of devices, such as embedded devices with sensors and actuators, personal computers, smart devices, and health devices. Many of these devices are categorized as “wearables,” meaning that they are intended to be carried and used on one’s body. As this category increases in popularity and functionality, developers will need a convenient way for these devices to communicate with each other and store information in a standardized and ecient manner. The Fog protocol and FogKit framework developed and demonstrated for this thesis address these issues by providing a set of powerful features, including data posting, data querying, event notifications, and network status requests. These features are defined as convenient JSON formatted messages which can be communicated between Bluetooth peripherals using an iOS device running FogKit as router and server.

This work deals with the fundamental principles of wireless communications in mobile robotics. It introduces overview of the use of different frequency bands for wireless communications needs and control of mobile devices in Czech Republic. It also contains a brief overview of all applicable technologies and available modules that can be used for wireless communication. The theoretical part deals with some of the protocols that were used in the practical part of this work and the manner of wave propagation in buildings. The practical part consisted of a design of our own application to monitor and control the module Mikrotik Routerboard. With this application we have tested and compared two wireless cards of this module.

This thesis deals with study of materials needed for proposing and implementation of the industry state indicator. In the theoretical part there are describe all used components including calculations. Then there is a description of the communication interface used on the indicator. The theoretical part is then followed by a description of MODBUS protocol. The practical part is divided into a few sections. First one decribes the implementation itself together with the idicator activation. Second one describes the programme equipment of microcotroller. The conclusion is about description of the application testing.

Main goal of creating this diploma thesis is existence of increasingly amount of potential threats against IP voice networks (VoIP). The thesis is devoted to testing of various types of attacks and provides some possible solutions for this systems as well. The work points out to a various types of current attacks against either insecure or very little secure structures. The theoretical part is dedicated to analyse and description of wide spectrum of VoIP protocols including signaling protocols (SIP, IAX2), transport protocols (RTP, RTCP) and security protocols (SRTP, ZRTP, IPsec, SDES). Further attention is dedicated to the one of possible open source IP PBX solutions called Asterisk. There is shown a variety of possible attacks against this system due to its openness, because open systems always tend to be more susceptible for various attacks as they need an advanced administration and endless need for searching of new trends in area of security. The last block of the theoretical part is focused on common threats and types of attacks against VoIP networks. The practical part is about design and creation of web application called ,,VoIP Hacks using PHP” written in PHP scripting language and ist main task is to execute three basic attacks: eavesdropping, call drop and call flood. There is also a possibility of port scanning of selected network which is added as supplementary part of this application. The application can be comfortably managed from web browser user interface. All captured data can be displayed directly into the web browser. Tests of the application were performed on Google Chrome and Mozzila Firefox browsers. There is an accent placed on cooperation between the application and terminal linux programmes such as Tshark, BYE Teardown, INVITE flooder or Nmap, which all accept commands from web interface and interpret gained output values back to the web browser.

This master's thesis report deals with the theoretical analysis of FHRP. First Hop Redundancy Protocols are network protocols which are designed to protect the default gateway and also to ensure high availability in the network by using redundancy. The reader becomes familiar with protocols VRRP, HSRP and GLBP and also learn the way how to configure them to on real Cisco devices. It also describes how implement VRRP int the simulated enviroment of OMNeT++. The result of the implementation is verified in the test topologies.

Objective: To compare the effects of thiopental, propofol and alfaxalone on arytenoid cartilage motion and establish dose rates to achieve a consistent oral laryngoscopy examination. Study design: Prospective, randomised, blinded crossover study. Animals: Six healthy adult beagle dogs. Methods: Each dog was administered three induction agents in a random order with a one week washout period between treatments. No premedication was used prior to induction of anaesthesia. Thiopental, propofol or alfaxalone were administered at 7.5 mg/kg, 3 mg/kg and 1.5 mg/kg, over 1 minute to effect, for induction of anaesthesia, respectively. If the dog was deemed inadequately anaesthetised then top-up boluses of 1.8 mg/kg, 0.75 mg/kg and 0.4 mg/kg, respectively, were administered over 10 seconds, repeated every 20 seconds, until an adequate anaesthetic plane had been reached. Continual examination of the larynx, using a laryngoscope, commenced once an adequate anaesthetic depth had been reached until recovery from anaesthesia. The number of arytenoid motions and deep inspiratory efforts (vital breaths) were counted within three time periods and compared over time among treatments. Data were analysed using Friedman test, Mann-Whitney U test, Spearman's rho, linear mixed model with post-hoc pairwise comparison with Tukey correction. Results interpreted at a 5% level of significance. Results: The median (range) induction time was 2.8 (2.0, 3.0), 2.7 (2.0, 3.3) and 2.5 (1.7, 3.3) minutes for thiopental, propofol and alfaxalone, respectively (p = 0.727). The median (range) dose rate required to achieve an adequate depth of anaesthesia was 6.3 (6.0, 6.6), 2.4 (2.4, 2.4) and 1.2 (1.2, 1.2) mg/kg/minute for thiopental, propofol and alfaxalone, respectively. Therefore, the median (range) total dose administered over the induction time was 17.8 (13.2, 18.8), 6.8 (5.3, 8.3) and 3.2 (2.3, 4.1) mg/kg for thiopental, propofol and alfaxalone, respectively. There was no significant difference for the total number of arytenoid motions (p =0.662) or vital breaths (p = 0.789) among induction agents. The median (range) examination times were 14.1 (8.0, 41.8), 5.4 (3.3, 14.8) and 8.5 (3.8, 31.6) minutes for thiopental, propofol and alfaxalone, respectively (p=0.016). Conclusion and clinical relevance: There was no significant difference in the total number of arytenoid motions among the induction agents. However, at the dose rates used in this study, propofol provided adequate conditions for evaluation of the larynx within a shorter examination time which may be advantageous during laryngoscopy in dogs. / Mini Dissertation (MMedVet)--University of Pretoria, 2016. / Companion Animal Clinical Studies / MMedVet / Unrestricted

A generalisation of the Diffie-Hellman protocol is studied in this dissertation. In the generalisation polynomials are used to reduce the representation size of a public key and linear shift registers for more efficient computations. These changes are important for the implementation of the protocol in con- strained environments. The security of the Diffie-Hellman protocol and its generalisation is based on the same computations problems. Lastly three examples of the generalisation and their implementation are discussed. For two of the protocols, models are given to predict the execution time and it is determined how well these model predictions are. / Dissertation (MSc (Applied Mathematics))--University of Pretoria, 2007. / Mathematics and Applied Mathematics / MSc / unrestricted