Diese Diplomarbeit beschreibt eine Software zur dreidimensionalen Visualisierung der Vorgänge in Computernetzwerken. Dabei werden die Protokolle TCP, UDP, IP, ARP und Ethernet grafisch veranschaulicht. Das Programm stellt außerdem Routing und NAT (Network Address Translation) dar. Zusätzlich gibt es drei von der Software erstellte Videos (je 2 - 15 MB).

In this diploma thesis, the implementation of a networking protocol, which is adopted from a previous work, is refined to a state where it is ready for production use. The protocol is tailored for the specific needs in a cluster environment which uses standard ethernet as the interconnection hardware. Thereby focuses is on developing and implementing a flow control which is very lightweigt in terms of processing overhead and copes the challenges of such a tightly coupled network gracefully. Second, the Log(G)P models for parallel computation are examined and it is shown that they do not give a usable definition of the overhead or latency parameters for protocols whose overhead is O(message size)–instead, the P-LogP model is used to characterize the protocol and for comparisons to the TCP/IP protocol suite. Last, it is demonstrated that the protocol gives usable results with real-world scientific applications.

Wireless sensor networks are composed of large numbers-up to thousands-of tiny radio-equipped sensors. Every sensor has a small microprocessor with enough power to allow the sensors to autonomously form networks through which sensor information is gathered. Wireless sensor networks makes it possible to monitor places like nuclear disaster areas or volcano craters without requiring humans to be immediately present. Many wireless sensor network applications cannot be performed in isolation; the sensor network must somehow be connected to monitoring and controlling entities. This thesis investigates a novel approach for connecting sensor networks to existing networks: by using the TCP/IP protocol suite in the sensor network, the sensors can be directly connected to an outside network without the need for special proxy servers or protocol converters. Bringing TCP/IP to wireless sensor networks is a challenging task, however. First, because of their limited physical size and low cost, sensors are severely constrained in terms of memory and processing power. Traditionally, these constraints have been considered too limiting for a sensor to be able to use the TCP/IP protocols. In this thesis, I show that even tiny sensors can communicate using TCP/IP. Second, the harsh communication conditions make TCP/IP perform poorly in terms of both throughput and energy efficiency. With this thesis, I suggest a number of optimizations that are intended to increase the performance of TCP/IP for sensor networks. The results of the work presented in this thesis has had a significant impact on the embedded TCP/IP networking community. The software developed as part of the thesis has become widely known in the community. The software is mentioned in books on embedded systems and networking, is used in academic courses on embedded systems, is the focus of articles in professional magazines, is incorporated in embedded operating systems, and is used in a large number of embedded devices. / Contiki / uIP

The goal of the project was to create independent system, which is able to supervise remote site using Ethernet network. It can measure temperature and check state of door magnetic contact. Gained information are sent over network to the cenral node, which is able to present them on web page. In the project are also discussed important network protocols needed for implementation of the system, hardware used for implementation and software of the system.

The main goal of this thesis is to design videoconferential system by Java Media Framework. This means to write two programs. One will capture multimedia data from webcam and will sent it into network. The second application which can receive this data is supposed to be on another computer. The multimedia data are transmitted by using Java Media Framework library. We suppose one lector and group of students. Video and audio channel is transmitted to all students. Communication between lector and student  is solved using chat. Lector has possibility open another audio or video channel with all students. Multimedia data will be transferred using Real-time Transport Protocol (RTP). The message including information about student is transferred by Transmission Control Protocol (TCP).

This thesis describes a possible integrated terrestrial-satellite network system for disaster recovery and response. The motivation of this thesis was based on the adjacent spectrum allocations between the Virginia Tech terrestrial Local Multiple Distribution Service (LMDS) system and a Ka-band satellite system, and potentially being able to provide as an additional Ka-band satellite network backbone to the Virginia Tech terrestrial LMDS system for better and faster communications deployments. The Spaceway satellite system's design parameters were adopted typically for a Ka-band satellite system. The LMDS system was assumed to use IEEE 802.16 standard protocols although it currently uses its own proprietary protocols. Four possible topologies integrating both terrestrial and satellite network were investigated. The study showed that the task was more problematic and complicated than anticipated due to incompatible network protocols, limitations of available hardware components, the high path loss at Ka-band, and the high cost of the equipment, although the adjacent frequency bands do suggest a possible integrated network. In this thesis, the final selected topology was proposed and designed. The technical characteristics of the earth station used for coupling both terrestrial and satellite networks were determined by a link budget analysis and a consideration of network implementations. The reflector antenna used by the earth station was designed. In addition, other system design concerns and engineering tradeoffs, including adjacent satellite interference, rain attenuation, antenna pointing error, noise temperature, and modulation and multiple access selection, were addressed. / Master of Science

Denna forskning utförs hos Tieto som hanterar IT-systemet Lifecare åt hälso- och sjukvården i ett antal regioner och län. Vårt arbete omfattar att utveckla en prototyp av en webbaserad realtidskommunikationslösning med en implementerad stark autentisering. Prototypen utvecklas för att underlätta arbetet kring en samordnad individuell planering (SIP) genom möjligheten att kunna genomföra möten på distans. Eftersom hälso- och sjukvården hanterar en stor mängd känslig information är stark autentisering ett krav på lösningen. Ett annat viktigt krav på lösningen är att den blir plattformsoberoende. I utvecklingsarbetet användes därför WebRTC som utvecklingsteknik då detta ramverk är anpassat till webbaserade realtidskommunikationslösningar vilket ger möjlighet till en stark autentisering. Ramverket WebRTC gör prototypen plattformsoberoende, då kommunikationen sker direkt över webbläsaren utan att något program är installerat. Resultatet av arbetet blev en fungerande prototyp av en WebRTC som vi skapat. Prototypen skapades utifrån teorier kring autentisering, designprinciper och WebRTC. Även data från de sammanställda intervjuerna med anställda inom sjukvården samt fallet vi tilldelats hos Tieto ligger till grund för prototypen. / This bachelor thesis is carried out at Tieto, which manages the Lifecare IT system used in healthcare in a number of counties and regions. Our work involves developing a prototype of a web-based real-time communication solution with an implemented strong authentication. The prototype is developed to facilitate the work on a coordinated individual plan (SIP) through the ability to conduct remote meetings. Because healthcare handles a large amount of sensitive information, strong authentication is a requirement for the solution. Another important requirement for the solution is that it becomes platform-independent. Therefore, in our development work, WebRTC was used as development technology, as this framework is adapted to web-based real-time communication solutions, enabling strong authentication. The WebRTC framework makes the prototype platform-independent, as communication occurs directly over the browser without the need for installed applications. The result of the work becomes a working prototype of a WebRTC that we create. The prototype is created based on theories about authentication, design principles and WebRTC. Data from the combined interviews with healthcare professionals and the case we were assigned at Tieto has also been vital for the prototype.

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