Sebastian Ryszard Kruk

D-FOAF: distributed identity management with access rights delegation

Todays WWW consists of more than just information The WWW provides a large number of services, which often require identification of its users This has lead to the fact that today users have to maintain a large number of different credentials for different websites – distributed or shared identification system are not widely deployed Furthermore current authorisation systems requires strict centralisation of the authorisation procedure – users themselves are usually not enabled to authorise their trusted friends to access services, although often this would be beneficial for services and businesses on the Web. n nIn this article we present D-FOAF, a distributed identity management system which deploys social networks We show how information inherent in social networks can be utilised to provide community driven access rights delegation and we analyse algorithms for managing distributed identity, authorisation and access rights checking Finally we show how the social networking information can be protected in a distributed environment.

JeromeDL – adding semantic web technologies to digital libraries

In recent years more and more information has been made available on the Web. High quality information is often stored in dedicated databases of digital libraries, which are on their way to become expanding islands of well organized information. However, managing this information still poses challenges. The Semantic Web provides technologies that are about help to meet these challenges. n nIn this article we present JeromeDL, a full fledged open-source digital library system. We exemplify how digital library content management can benefit from the Semantic Web. We define and evaluate browsing and searching features. We describe how the semantic descriptions of resources and users profiles improve the usability of a digital library. We present how digital libraries can be interconnected into one heterogeneous database with use of semantic technologies.

Graphical representation of RDF queries

In this poster we discuss a graphical notation for representing queries for semistructured data. We try to strike a balance between expressiveness of the query language and simplicity and understandability of the graphical notation. We present the primitives of the notation by means of examples.

E-learning on the social semantic information sources

E-Learning grows on the fertile soil of the Internet technologies; it fails, however, to reach their full potential. With new, emerging technologies of the second generation Internet there is even more to be captured and adopted: knowledge sharing with blogs, wikis, and social bookmarking services. In this article we argue that those technologies can be adapted to improve user experience in e-Learning; we present an online social bookmarking system called Social Semantic Collaborative Filtering (SSCF). SSCF supports SIOC (Semantically-Interlinked Online Communities) metadata which ultimately transforms it in to a browser of blogs, fora, and other community sites. We show how a digital library system, such as JeromeDL, utilising this technology can be used in the e-Learning process, which takes advantage of recent research in the Internet.

2lip: the step towards the web3d

The World Wide Web allows users to create and publish a variety of resources, including multimedia ones. Most of the contemporary best practices for designing web interfaces, however, do not take into account the 3D techniques.n In this paper we present a novel approach for designing interactive web applications -- 2-Layer Interface Paradigm (2LIP). The background layer of the 2LIP-type user interface is a 3D scene, which a user cannot directly interact with. The foreground layer is HTML content. Only taking an action on this content (e.g. pressing a hyperlink, scrolling a page) can affect the 3D scene.n We introduce a reference implementation of 2LIP: Copernicus - The Virtual 3D Encyclopedia, which shows one of the potential paths of the evolution of Wikipedia towards Web 3.0. Based on the evaluation of Copernicus we prove that designing web interfaces according to 2LIP provides users a better browsing experience, without harming the interaction.

Semantic Web and Ontologies

This chapter presents ontologies and their role in the creation of the Semantic Web. Ontologies hold special interest, because they are very closely related to the way we understand the world. They provide common understanding, the very first step to successful communication. In following sections, we will present ontologies, how they are created and used. We will describe available tools for specifying and working with ontologies.

Rendering navigation and information space with honeycomb

The growing amount of available information poses challenges not only in the process of information retrieval. The usability of the rendered search process and results can be increased by appropriate visualization techniques or new interaction paradigms, or both. In this article we present the HoneyComb™ paradigm, an information visualization style that aims to render and manage large quantities of information items. We describe the design objectives and the prototype of HC™. Finally, we present a short evaluation of the HC™ paradigm in the context of search and browsing.