En realtidsbaserad kollaborativ webbapplikation kategoriseras som en molntjänst och en molntjänst består utav en webbapplikation och en eller flera databaser. MongoDB som används i projektet är en icke-relationsdatabas. För att uppnå realtid används verktyget HTML5 WebSockets. Problemet är att hur ska den realtidsbaserade kollaborativa webbapplikationen byggas upp för att kunna uppdatera datan så snabbt som möjligt vid förändring. Databaserna som testas mot varandra är MySQL mot MongoDB och för att testa databaserna byggs en realtidsbaserad kollaborativ webbapplikation för modellering av UML-diagram. För att testa hypotesen utförs ett experiment och experimentet påvisade att hypotesen stämde delvis. MongoDB är snabbar på att uppdatera ett specifikt objekt jämfört med MySQL i tre av fyra testfall och för att hämta all data presterar databaserna nästan identiskt i alla testfallen. För fortsatt arbete är de intressant att testa en större datamängd och se hur det påverkar hämtningstiden när all data hämtas från databaserna.

The diploma thesis deals with design and implementation of cooperative work on documents in the application TEXonWeb. The diploma theses includes the analysis of competitive solutions and key technologies for implementation. The cooperative work on documents is a functionality which allows users to cooperate simply on one document in real-time. Text of the thesis describes the process of implementation using the technology which is described in the initial analysis. The diploma theses also includes some ideas for next possible development.

Goal of this master thesis is to analyze existing algorithms for ensuring consistency in real-time synchronization of vector graphics between server and multiple clients, testing them, describe main differences and selection of the best for this purpose. The theoretical part is devoted to realtime comunication over HTTP, to WebSockets, to concurrency algorithms and to basics of application architecture. The practical part describes the technology used in this thesis, as well as actual application design a its implementation. The result of this thesis is an overview of concurrency algorithms, the choise of technology for real-time communication between server and multiple clients and implementation of selected technologies and algorithms in Node.js application.

The goal with this project has been to develop an application where a user can create and manage tournaments that uses the Swiss format. The application would consist of one display page that can be used to show the current state of the tournament for all the competitors, and one admin page where a user can update match results and generate a new round of matches. The application has been developed with Node.js on the server side and the JavaScript library React on the client side. All the React code is written in the modern way with functional components and the usage of React Hooks. The document based database MongoDB has been used for the application. Real time-updates has been implemented with the library Socket.IO The project has led to a well-functioning application where a user can create och manage a tournament and where all the updates are done in real time in a neat and smooth way. The creator of the tournament can share both the admin page and the display page to other people who want to see the tournament result by sharing the link to the specific tournament. / Målet med denna projektuppgift har varit att utveckla en applikation där användare kan skapa och hantera turneringar som använder sig av Swiss-formatet. Applikationen skulle bestå av dels en uppvisningssida som kan användas till att visa upp turneringens aktuella resultat för medtävlande och dels en administrationssida där en användare kan uppdatera matchresultat och generera en ny omgång matcher. Applikationen har utvecklats med Node.js till serversidan och JavaScript-biblioteket React på klientsidan. All React-kod är skriven med funktionskomponenter och React Hooks, vilket är det moderna sättet att utveckla i React på. Som databas till applikationen har en dokumentbaserad databas använts: MongoDB. Realtidsuppdateringarna har möjliggjorts med hjälp av biblioteket Socket.IO. Projektet har lett till en väl fungerande applikation där en användare kan skapa och hantera en turnering, och där alla uppdateringar sker i realtid på ett snyggt och smidigt sätt. Skaparen av turneringen kan dela med sig både administrationssidan och uppvisningssidan till andra personer som vill se turneringsresultaten genom att dela länken till den specifika turneringen.

本研究針對目前最新技術發展趨勢，提出一個以瀏覽器為中心的雲端運算服務模型。本研究稱之「雲端服務交換器系統」，解決後端大量巨量資料透過緩衝區送至前端瀏覽器頁面顕示之問題並改善傳輸速度。本研究整合MongoDB、AngularJS、Socket.IO、Kafka、Node.js五項元素。研究解決前端中JavaScript與網頁互動之困難、前後端開發語言相容性問題、巨量資料需求造成的伺服器負載量、前後端即時通訊效能等問題，最後達成建置高頻交易網站之目的。

This thesis presents an empirical analysis of the performance of WebTransport and WebSocket using the Socket.IO framework under varying network conditions. The thesis investigates two primary experiments, message round trip time and multiplexing performance, both conducted under three scenarios—perfect network (0% packet loss), moderate network (5% packet loss), and poor network (15% packet loss). The experiments were conducted on a system running Fedora 40 with a 12th Gen Intel Core i5-12600K processor and 16 GB of memory. The findings demonstrate that WebTransport mitigates Head-of-Line (HOL) blocking more effectively than WebSocket, especially in environments with degraded networks. WebTransport (Reliable) provided a significant performance advantage under suboptimal network conditions when measuring message round trip time, while WebTransport (Unreliable) consistently demonstrated slightly lower latency but with some data loss. When multiplexing, WebTransport showed significant performance benefits compared to using WebSocket.

The diploma thesis deals with file sharing among users through peer-to-peer transfer in a web environment. The aim was to create a simple application which would provide a group of users with an opportunity to share files among them without any presence of third party or limitation. I have met the target using modern web technologies, of which the most important was WebRTC library through which peer-to-peer transfer has been implemented. These technologies were supported by optimased algorithm and the most recent tools for processing and storage of shared files. The result is a real-time application enabling users to create rooms, in which they can share their files. This product was subjected to speed tests, thanks to which the application turned out to be the fastest in the tested environment contrary to solutions with similar nature or any other commonly used tools for file sharing.

This master's thesis is focused on Information Technology Infrastructure Library (ITIL). Objective of the project was to analyze, design and implement a game engine, which would provide simulation of IT service operation in real or accelerated time or in turns. Basic part of the engine is a creators mode, which allows users to create custom IT services and specify their behaviour during operation, like the service would be used in real. Another part of the engine is a players mode and simple service desk. In this mode, players can take care of fluent operation of their services. Thanks to this, they can learn and train practices, which are described in ITIL.

The subject of this thesis is the design and implementation of a client-server applications for collecting GPS data using a smartphone with Android OS. The system is used for real-time monitoring and recording vehicle’s movement on a server, where the data are adapted to the real road. This thesis is a continuation of the project DoAutoškoly.cz . The theoretical part of the thesis deals with GPS, real-time communication problems and the Android platform, including its application interface for GPS. In the next part of the thesis, this knowledge is used to design the whole system. The thesis continues with the implementation of a mobile application, the web module and the corresponding server application. The chapters continue to deal with real-time tracking and route editing. The last part is focused on testing and evaluation of the results.

The Web Based Audio Editor thesis deals with the requirements specification, selection of technologies and with the implementation itself. The thesis uses modern approaches of HTML5 standards and is divided into the client and the server parts. Both the web application and the server are implemented in JavaScript. The Web based audio editor allows basic editing features like cut, shifting, deleting. All this in multiple audio tracks. The application runs in recent versions of the most widely used web browsers.