Diagnostics of Interactive Network Communication

Tato práce se zabývá problematikou výpadků a ztrát v interaktivní síťové komunikace. V úvodu je vysvětlena základní teorie komunikace sítí. Důležitou část práce tvoří analýza komunikace aplikací Vzdálená plocha, SJphone a webové hry Kulečník. Hlavním cílem je vytvořit nástroj pro detekci výpadků při komunikaci těchto aplikací. Výsledkem práce jsou testy vyhodnocující schopnost detekce výpadků při interaktivní síťové komunikaci.This thesis deals with the issue of blackouts and losses in the interactive network communication. In the introduction the basic theory of network communication is explained. Important part of the thesis presents communication analysis of applications Remote Area, SJphone and internet game Billiards. The main objective is to create a tool for detection of the blackouts during the communication of these applications. The results of the thesis are tests evaluating the ability of detection of the blackouts by the interactive network communication.

Towards the 3D Web with Open Simulator

Continuing advances and reduced costs in computational power, graphics processors and network bandwidth have led to 3D immersive multi-user virtual worlds becoming increasingly accessible while offering an improved and engaging Quality of Experience. At the same time the functionality of the World Wide Web continues to expand alongside the computing infrastructure it runs on and pages can now routinely accommodate many forms of interactive multimedia components as standard features - streaming video for example. Inevitably there is an emerging expectation that the Web will expand further to incorporate immersive 3D environments. This is exciting because humans are well adapted to operating in 3D environments and it is challenging because existing software and skill sets are focused around competencies in 2D Web applications. Open Simulator (OpenSim) is a freely available open source tool-kit that empowers users to create and deploy their own 3D environments in the same way that anyone can create and deploy a Web site. Its characteristics can be seen as a set of references as to how the 3D Web could be instantiated. This paper describes experiments carried out with OpenSim to better understand network and system issues, and presents experience in using OpenSim to develop and deliver applications for education and cultural heritage. Evaluation is based upon observations of these applications in use and measurements of systems both in the lab and in the wild.Postprin

The design and analysis of a corporate data network supporting a real-time clinical data application

In this study a design is proposed for a corporate, data network supporting real-time data applications. The proposed network incorporates both Local Area Network and Wide Area Network technologies to form a system capable of supporting a variety of applications. Multimedia software, like desktop video conferencing, IP telephony, and video streaming are becoming more pervasive. Since multimedia applications depend on active human involvement and perception, they are commonly referred to as real-time. The content of real-time applications relies on the timely and consistent delivery of information. If real-time applications experience any variation in information delivery, usually referred to as jitter, the result is unacceptable application performance. However, real-time applications are not solely limited to traditional multimedia. Interactive client-server based data applications also fall into this category. This project will specifically focus on the performance of a real-time clinical application, which has become predominant in the healthcare industry. To support the implementation of the proposed network, empirical data was gathered from system testing. Testing involved comparing the performance of a real-time application on the proposed design, against the current architecture. The result found that the proposed data network design reduced transport latency, allowing the real-time application to perform more efficiently