This thesis is presented in two parts: The first section gives a general summary of the research and acts as a complement to the second section, which contains a series of related publications.įrom the Book:PREFACE: PrefaceThe boundaries between the IT world, Internet systems and broadcast television technologies have blurred. They include URL, Socket, Datagram, and SOAP models which applications can choose to use in order to establish a connection with the service or broadcaster in order to transfer data. Various communication models are also discussed that meet the interactivity requirements for different interactive services. This thesis also studies interactivity methods using Java APIs via a return channel. The still content (i.e., text, images, and graphics) and dynamic content (i.e., hyperlinked text, animations, and forms) can then be modeled and processed efficiently. Content parsing was designed as a lightweight software module based around two parsers (i.e., SAX parsing and DOM parsing). Applications were designed aimed at studying the data structure and efficiency of the XML language to define interactive content. Various aspects of Java user interfaces were studied and my research in this area focused on creating a remote control event model and lightweight drawing components using the Java Abstract Window Toolkit (AWT) and Java Media Framework (JMF) together with Extensible Markup Language (XML). User interface development is more complex for this type of platform (when compared to that for a desktop computer) as many constraints are set on the look and feel (e.g., TV-like and limited buttons). The architecture of both application manager and Xlet forms the basic framework for running multiple interactive services simultaneously in future set-top box designs. The application manager was designed to control the lifecycle of Xlets manage set-top box resources and remote control keys and to adapt the graphical device environment. The middleware architecture used was made up of an Application Manager, Application Programming Interface (API), a Java Virtual Machine, etc., which were arranged in a layered model to ensure the interoperability. The main issues include middleware architecture, a Java user interface for digital television, content representation and return channel communications. Published research is limited and therefore this thesis aims at establishing a set of computing methods using Java and XML technology for future set-top box interactive services. Studying development of interactive services for digital television is a leading edge area of work as there is minimal research or precedent to guide their design.
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