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Converged solution of speech services
Mácha, Tomáš ; Kovář, Petr (referee) ; Novotný, Vít (advisor)
Development in VoIP technology is connected with the rapid growth of quality and data rate of the Internet connection. The application of the VoIP technology has become one of the key areas in telecommunication and networking. The main task of this thesis was to explore the questions of IP telephony and voice transmission over data networks according to H.323, SIP and Cisco architectures. Next focus was on designing and implementing experimental workplaces of mentioned architectures and their converged solutions. The purpose of the first chapter is to introduce the theory background of architectures required for implementation of real-time services in data networks and their comparison. The key objectives of the second and third part are to design and implement experimental workplaces containing signaling and proxy servers and hardware or software IP phones of several architectures. Illustration examples of different network topologies are included to demonstrate designed and realized VoIP solutions. Several tests of established communication are done using a packet analyzer. These tests examine duplex data transmission over IP. This article also contains two laboratory exercises designed according to gained practical experiences. The laboratory exercises provide an overview of theory and clearly indicate the possibilities of IP telephony.
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Control Procedure Analysis in EPS-IMS Networks
Šubrt, Jan ; Červenák, Rastislav (referee) ; Novotný, Vít (advisor)
The master thesis is focused on control procedures in EPS-IMS networks. Firstly the thesis describes systems IMS and EPS. The second part of thesis includes the theory of control procedures in EPS such as cell acquisition, random access procedure, identification of subscriber, authentication of subscriber, security procedures, tracking area procedure, default bearer creation, implementation of CSFB procedure and detach procedure. Processes related to subsystem IMS such as registration to IMS, bearer creation for IMS signalling and voice service VoLTE are the next part of thesis. The next main topic is the VoLTE implementation problematic and VoLTE cooperation with diverse terminals. There is also explained the principle of Circuit Switched Fallback for realization voice services in EPS without VoLTE service. All procedures mentioned above except of procedures which are related to IMS were captured and analyzed using software Wireshark and QualiPoc. The final part of the thesis is lab task creation based of the analyzed messages.
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Controller for the Model Railway Based on FITKit
Kandrik, Ján ; Kotásek, Zdeněk (referee) ; Straka, Martin (advisor)
This work discusses a controller for model railroad derived from a state-of-art railway interlocking system, electronic signalbox. Work of interlocking and model railroad signalling issues are described among the design and implementation parts of such system. Also analyses creation of parts for the controller using FITkit, a microcontroller educational platform.
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Analysis of control traffic in mobile networks
Šubrt, Jan ; Krkoš, Radko (referee) ; Novotný, Vít (advisor)
The Bachelor´s thesis describe management procedures in mobile systems. This thesis is mainly focused on mobile systems GSM and LTE. Further are describe basic processes what are required before starting service. This basic procedures contains: inspection of radio signals, select the cell with the best parameters for connection, allocate channel to mobile station, authentication of subscriber and location update. Next part of thesis describe procedures in handover, initialize call session and data session. Last chapter describes laboratory task for subject Communication resources in mobile networks.
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Signalling Transmission for Internet Television
Burget, Radim ; Makáň, Florian (referee) ; Vodrážka,, Jiří (referee) ; Komosný, Dan (advisor)
A signalization in an Internet protocol environment is commonly used for monitoring quality of service and other parameters of a network. This thesis is involved in transmission of signalization through internet protocol networks and proposes scalable solution for small and even for large-scale internet television broadcasting. The main contribution of this thesis lies in design and validation of optimal hierarchical tree on the basis of resources assigned. This is done in respect to geographical distance, network distance of each particular member of the hierarchical structure. For the design of algorithms simulations and global experimental network were used.
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Home Location Register Emulator
Juránek, Michal ; Ráb, Jaroslav (referee) ; Ščuglík, František (advisor)
This thesis presents basic structure and entities of mobile network GSM. It presents principles of signalling with focus on core network via signalling systems SS7 and SIGTRAN. Chosen protocol layers and signalling message types are presented. The thesis is concluded by the design and implementation of the application emulating home location register of mobile users.
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Wingless/Notch crosstalk in Drosophila melanogaster
Hajšmanová, Hana ; Mašek, Jan (advisor) ; Macůrková, Marie (referee)
Fundamental for the existence of multicellular organisms is the presence signalling pathways, complex biochemical cascades, allowing reciprocal communication amongst the cells. Both Notch and Wnt pathways are crucial for embryonic development and their deregulation leads to many severe diseases. Decades of research, largely based on model organism D. melanogaster, showed that components of these pathways do not function strictly separately but on contrary interact with each other (crosstalk). This phenomenon is explored only to a lesser extent in mammals. The aim of this thesis is to recapitulate existing findings of Wnt/ Notch crosstalk in D. melanogaster and outline where crosstalk could play a role in mammals.
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Non-neuronal cell outgrowth in Caenorhabditis elegans model system
Smidžárová, Lucie ; Macůrková, Marie (advisor) ; Strouhalová, Kateřina (referee)
1 Abstract Oriented cell growth is an important process for regular tissue development, in which regulated changes in cell shapes occur. An important role in this mechanism is played by remodelling of cytoskeletal elements in the growing parts of the cell, which is regulated by many extracellular and intracellular factors. This bachelor's thesis is focused on oriented non-neuronal cells growth in the model organism Caenorhabditis elegans, specifically the growth of the excretory cell and the anchor cell invasion. The growth mechanism of the excretory canal cell is in many aspects similar to growth of neurons, however it also involves a unique mechanism of growth through extension of an intracellular lumen. In case of the anchor cell the growth mechanisms support the basement membrane disruption and invasive behavior reminiscent of metastatic cancer cells. Regulation of growth of these two cells thus could serve as a good model for human pathologies such as cystic kidney disease or cancer cell metastasis, and therefore further study in this area could lead to new insights into these diseases. At the end of the thesis, other non- neuronal cells with oriented growth in the model organism C.elegans are briefly described. Key words: cell outgrowth, excretory canal cell, anchor cell, signalling, cytoskeleton
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It takes two to tango; signal perception during male-female interaction in flowering plants
Vlasák, Jonáš ; Honys, David (advisor) ; Vaňková, Radomíra (referee)
This thesis summarizes the current understanding of the communication between partners during the progamic phase of pollen with focus on the cruciferous family After attachment of conspecific pollen to stigma, pollen coat peptides (PCP) competitively inhibit the signaling perceived by the FERONIA receptor in the papillary cell and thus allow pollen acceptance. Contrary, the interaction of pollen protein SCR (S-LOCUS CYSTEIN RICH PROTEIN) with SRK receptor (S-LOCUS RECEPTOR KINASE) determines pollen incompatibility. The regulation of oriented secretion is essential for pollen tube (PT) growth. During the growth of the PT, the components of the extracellular matrix as well as stiffness and preassure are perceived. On its way to the egg, the PT matures and acquires the competence to perceive signals. The PT exits the transmitting tract thanks to the ovular signalisation. The PT is accepted by synergids, communication takes place involving RALF peptides (RAPID ALKALIZATION FACTOR) and the FERONIA receptor. The signaling results in the rupture of the PT and the transport of sperm cells to the female gametes. Sperm cells bind to the egg cell and the central cell and after confirmation, fuse with the female gametes. After fertilization, the egg cell degrades signaling molecules and the persistent synergid also...
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Signalization in the ontogeny of bacterial colonies
Čepl, Jaroslav ; Markoš, Anton (advisor) ; Kuthan, Martin (referee)
Bacterial bodies (colonies) can develop complex patterns of color and structure. These patterns may arise as a result of both colony-autonomous processes (self-patterning) and environmental influences, including those generated by neighbor bodies. We have studied the interplay of intra-colony signaling (self-patterning) and inter-colony influences in related clones of Serratia rubidaea on rich media. We show that the mutual influencing of colonies, present in a common morphospace, is communicated by at least two putative signals. A model accounting for some aspects of colony morphogenesis and inter-colony interactions is proposed. Key words bacteria; Serratia sp.; airborne signals; colony morphogenesis
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