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Deploying thin clients and terminal servers in various environments that differ in requirements for load and performance
Králík, Martin ; Lattenberg, Ivo (referee) ; Kouřil, Jiří (advisor)
The thesis deals with possibilities of the use of terminal servers and available virtualization technologies on Microsoft, Vmware and Citrix platforms.In the first part, technical principles for virtualization are analyzed in detail and contributions to individual technologies are compared.The second part is practically aimed and deals with the suggestion of testing methodology.The testing methodology consists of identification of key factors describing user´s behaviour, which are subsequently used for selection and dimensioning of hardware architecture.The testing methodology is transformed into a scripting language and prepared for automated tests.The realized tests can be divided into groups dealing with sever load performance, monitoring data transfer, and mapping of the system time response to user´s stimulation.Thin and software clients are computed on the clients side.Performance characterizations of RDP and PcoIP protocols are monitored and compared here. On the basis of the results of performed tests two case studies for computing thin clients in the environment of The Department of Telecommunications,Brno university of Technology and in a basic school are elaborated. The first case study intended for The Department of Telecommunications is concerned with computing of VMware View technology for 150 clients. The second one supposes to compute Microsoft Remote Desktop Services in the system enviroment of a basic school for 15 clients.
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Implementation of multi-purpose server based on WINDOWS
Depiak, Petr ; Kouřil, Jiří (referee) ; Pfeifer, Václav (advisor)
This thesis puts brain to the pieces of knowledge of the network services which are occurred in the server systems. These services are related to data storing, transport and data interpretation. Basically there are transport services which are used by FTP and SMB protocols. These protocols define them generally and their security too. Next section describes principles and application possibilities of electronic mail. It is based on SMTP, POP3 and IMAP protocols. The important part of this thesis is the World Wide Web service exploiting the HTTP protocol. It also refers to creation of dynamic presentation of electronic document by using the MySQL relational database and PHP script language. Practical part goes out of the theoretical part discussed above and all services are implemented on the MS Windows 2003 Server EE R2 platform. The main scope is oriented to the highest usage of data security within the available software. Other part presents the introduction to hosting of the Novell eDirectory service. It is practically applied on the MS Windows platform. This application also includes the administration of eDirecroty service by using the standard tool. This tool allows the administration though the web interface.
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Modulations in PLC systems
Procházka, Vít ; Kouřil, Jiří (referee) ; Krajsa, Ondřej (advisor)
The bachelor thesis describes principles and methods of Powerline Communications, practical usage possibilities both in industrial applications but mainly in broadband systems that may represent promising competition to conventional broadband access, e. g. xDSL connections without the need of new wiring, WIFI etc. The thesis also focuses on problems that can occur in the communication channel from the view of electromagnetic compatibility and assorted interferences. The 50 Hz frequency electric network (60 Hz in the USA) was not designed for data signal transmission, problems may arise mainly at higher frequencies and broadband communication. It is necessary to implement methods which enable transfer of information signal through a communication channel with minimalization of problems such as interference, cable attenuation, electromagnetic compatibility, bit error rate (BER), etc. Furthermore, currently used modulation principles and their characteristics are described, such as spread spectrum modulation DSSS, FHSS, traditional OFDM, alternative modulations FMT and DWMT with filter banks. The last chapter of the bachelor thesis features models of particular modulations created in the Matlab-Simulink program and the conclusion presents advantages and disadvantages of their implementation in PLC systems.
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Analysis of Quality of Service Assurance in Wireless Networks
Hornyak, Tomáš ; Kouřil, Jiří (referee) ; Hošek, Jiří (advisor)
This Bachelor thesis deals especially with possibilities of quality of service assurance and mobility implementation in wireless networks. It deals primarily with the possibilities of the IEEE 802.11e standard, with the applicability of the Mobile IPv4 protocol and with the computer simulation of their mutual coactions in the OPNET Modeler 12.0 environment. In the first part of the thesis the standard IEEE 802.11e is first of all analysed from the theoretical point of view. It is followed by the detailed description of the IEEE 802.11e standard, its individual parts and implementation possibilities of advanced technologies of the access to the medium which are included in the standard. In this part even the individual advantages and disadvantages of the original access methods of wireless networks of IEEE 802.11 standards are briefly outlined. Further part of this work deals with the theoretical analysis of mobility service assurance in the IP networks and with the mobility implementation in individual layers of the ISO/OSI models. Then the Mobile IPv4 protocol is presented here that carries out the mobility in the IP networks. The principle of this protocol is mentioned here and its individual components and the network architecture are presented. In the next part, on the basis of theoretical pieces of knowledge in the environment of the OPNET Modeler simulation tool the effect of the standard IEEE 802.11e implementation is examined on the selected statistics of the wireless local network. Furthermore the effect of the load in the network is followed up and standard modifications are discussed here to reach optimum results. The last part deals with the computer simulation of the Mobile IPv4 protocol in the wireless networks. Then the support of the IEEE 802.11e standard is implemented into the functioning network model and the reciprocal coactions of both technologies and a possible appearance of any problems are examined. For comparison, it is here in the OPNET Modeler environment even the mobility simulated which is based solely on the link layer.
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Implementation of the CAN 2.0 Communication Protocol in single-chip microprocessors
Machálka, Lukáš ; Kouřil, Jiří (referee) ; Koton, Jaroslav (advisor)
This diploma thesis deals with the implementation of the CAN 2.0 communication protocol in single-chip microprocessors. In the first part communication protocols currently used in automotive application and their properties are described, with impact on communication protocol CAN 2.0. The second part is dedicated to the description of communication protocol CAN 2.0 particular features. The principle of data transmission, principle of bus arbitration and also the structure of individual frames, which can occur on it are mentioned. The final part relates with the task to compare FIFO architecture to MailBox architecture. On the basis of measurement the comparison of these architectures in typical applications was performed. Because of setting these results the prototyping board was designed. This board was utilized to design the net conception.
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Analysis of technologies for quality of services assurance in packet networks
Kulhány, Andrej ; Kouřil, Jiří (referee) ; Hošek, Jiří (advisor)
This bachelor thesis focus on analysis of technologies for guaranted quality of services in packet network. In main part I devote to detailed study of technologies IntServ and DiffServ. Practical part of my bachelor thesis includes design of network in simulating program Openet Modeler. Designed network is pecialized to guarantee quality of services during voice transmission by technology DiffServ. When designing the network I simulated guarantee of services in network without quality of service and in network with quality of services technology DiffServ. Finaly I compared issues of simulations.
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Software for assuming control over the computer
Kostelník, Jan ; Kouřil, Jiří (referee) ; Polívka, Michal (advisor)
The introduction of this Master’s thesis describes a historical and technological evolution of the terminal application, including its advantages and disadvantages. In the following part, a general description of the services and their understanding are mentioned. The benefits and general advantages of the terminal services are described. For the each type of the terminal service, all the functions, options, exact advantages and disadvantages are described. Consequently, the study of the suitability of the compression is presented. On the demo application, the impact of an excessive (voluntary) loss of information is demonstrated. In the next part, the thesis deals with the most frequently used remote-control applications. The tests and comparisons are made as well. The fifth chapter is the fundamental part of this work. The design approach of the workbench is presented there. Consequently, the design approach and system implementation intended for the supervision and control is described. This system makes the user possible to observe other user’s activities and also to control their workstations. The supervising user can also access their drives and other memory devices, which are located in the monitored workstation. The communication is compressed and encrypted. The symmetric and asymmetric encryption algorithms are used there. In the following part, there are two supplementary applications mentioned – application for the key generating and network file manager. In the end of my work, the results of the performance test and also the design of other improvements are presented.
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Analyser of DMX512 Protocol with USB Interface
Bartoň, Zdeněk ; Hošek, Jiří (referee) ; Kouřil, Jiří (advisor)
Aim of this work is to make know readers with modern technologies for driving scenic and musical techniques, with focus especially on a new technologies of communication. Subsequently this work deals with proposal and realization electronic device enabling analysis of control protocol DMX512, but also testing bus DMX512.
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Energy efficient wireless sensor platform for a snow load measurement
Bačinský, Martin ; Kouřil, Jiří (referee) ; Mráz, Ľubomír (advisor)
This bachelor thesis describes the problematics of snow load measuring. At first, sensors' principles of functionality for indirect measurements are mentioned. In the second part, the problematics of direct measurement with tensiometer takes place. The construction of wireless apparatus with the help of module ZigBit for the snow load measurement is the result of this work. Sensor board is designed in Eagle software, obeying standards for machine vacuum pickup and fabrication. The apparatus works in two modes. During indirect measuring, additional processing of data is necessary. In this mode, the sensor board has very low energy consuption and therefore long service life also after a battery connection. In the second mode, the apparatus is automatically sending data about actual snow load of particular roof. The whole machine communicates with the help of ZigBit module and ZigBee protocol IEEE 802.15.4. The communication distance between sensorial points is allowed up to 100m. At last but not at least, tensiometer UTILCELL M230 measurements are attached. In attachments, chemas and printed circuit boards are presented, too. Except documentation, the CD contains also libraries for components and details for DPS machine production in Eagle Software.
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Methods of access to PostgreSQL databases in .NET Framework
Henzl, Václav ; Kouřil, Jiří (referee) ; Lattenberg, Ivo (advisor)
The results of this work are two major projects - NpgObjects and PagedDataGridView. NpgObjects is a simple ORM framework to enable the mapping database tables to objects in the common language runtime. It contains a specially designed generator which generates classes in C# from information obtained from the database. These classes are mapping on the database tables one to one. NpgObjects allows all the basic database operations - SELECT, INSERT, UPDATE and DELETE. PagedDataGridView is a component for displaying tabular data. In cooperation with NpgObjects can paginate database data and manage the flow of data into application. It provides a comfortable user interface, which can easily navigate between different pages of data.
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