Adaptive hypermedia is a new direction of research within the area of adaptive and user model-based interfaces. Adaptive hypermedia (AH) systems build a model of the individual user and apply it for adaptation to that user, for example, to adapt the content of a hypermedia page to the user's knowledge and goals, or to suggest the most relevant links to follow. AH systems are used now in several application areas where the hyperspace is reasonably large and where a hypermedia application is expected to be used by individuals with different goals, knowledge and backgrounds. This paper is a review of existing work on adaptive hypermedia. The paper is centered around a set of identified methods and techniques of AH. It introduces several dimensions of classification of AH systems, methods and techniques and describes the most important of them.

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Methods and techniques of adaptive hypermedia

Automatic generation and detection of highly reliable fiducial markers under occlusion

This paper surveys the current state-of-the-art of technology, systems and applications in Augmented Reality. It describes work performed by many different research groups, the purpose behind each new Augmented Reality system, and the difficulties and problems encountered when building some Augmented Reality applications. It surveys mobile augmented reality systems challenges and requirements for successful mobile systems. This paper summarizes the current applications of Augmented Reality and speculates on future applications and where current research will lead Augmented Reality's development. Challenges augmented reality is facing in each of these applications to go from the laboratories to the industry, as well as the future challenges we can forecast are also discussed in this paper. Section 1 gives an introduction to what Augmented Reality is and the motivations for developing this technology. Section 2 discusses Augmented Reality Technologies with computer vision methods, AR devices, interfaces and systems, and visualization tools. The mobile and wireless systems for Augmented Reality are discussed in Section 3. Four classes of current applications that have been explored are described in Section 4. These applications were chosen as they are the most famous type of applications encountered when researching AR apps. The future of augmented reality and the challenges they will be facing are discussed in Section 5.

Augmented reality technologies, systems and applications

One distinctive feature of any adaptive system is the user model that represents essential information about each user This chapter complements other chapters of this book in reviewing user models and user modeling approaches applied in adaptive Web systems The presentation is structured along three dimensions: what is being modeled, how it is modeled, and how the models are maintained After a broad overview of the nature of the information presented in these various user models, the chapter focuses on two groups of approaches to user model representation and maintenance: the overlay approach to user model representation and the uncertainty-based approach to user modeling

User models for adaptive hypermedia and adaptive educational systems

A method of using stereo vision to interface with a computer is provided. The method includes capturing a stereo image, and processing the stereo image to determine position information of an object in the stereo image. The object is controlled by a user. The method also includes communicating the position information to the computer to allow the user to interact with a computer application.

Video-based image control system

The Virtual Showcase is a new projection-based and application-specific Augmented Reality display that offers an innovative way of accessing, presenting, and interacting with scientific and cultural content. Conceptually, the Virtual Showcase is compatible with the conventional showcases used, for instance, by museums. However, it allows the display of computer generated 3D graphics and animations together with real artifacts within the same space. From the technological point of view, the Virtual Showcase provides perspective correct stereoscopic viewing for multiple users, high resolution, low parallax (reflected projection plane inside the showcase), and support for mutual occlusion between real and virtual objects.

The virtual showcase: a projection-based multi-user augmented reality display

Merging Fossil Specimens with Computer- Information

Unter Verwendung von Virtueller Realität (VR) und der damit verbundenen neuartigen Technologie, entwickeln sich computergestützte Umgebungen eindeutig zu einer Hauptkomponente von zukünftigen Arbeitsplätzen. Dank einiger technologischen Entwicklungen innerhalb der letzten Jahre, stellte sich VR als eine praktisch einsetzbare Möglichkeit für viele Anwendungsbereiche heraus. In diesem Artikel wollen wir einige Ideen, technologische Konzepte und aktuelle Forschungsergebnisse vorstellen, die eine Nahtlose Integration von VR in eine gewohnte Arbeitsumgebung ermöglichen sollen, und somit zu einer sukzessiven Wandlung dieser Umgebungen zu high-tech Arbeitsplätzen beitragen. SEAMLESS INTEGRATION OF VIRTUAL REALITY IN

Nahtlose integration von virtueller realität in gewohnte arbeitsplätze

Associate Editor in Chief Miguel Encarnacao discusses the state of visualization in academia and industry. Also, he thanks former editor in chief and long-time editorial board member Maureen Stone, as she retires from the editorial board.

Encouraging the Use of Visualization Technology

Modern science museums use highly interactive exhibits to engage their visitors. However, other informal education centers such as zoos and aquaria suffer from the problem that direct interaction with their specimens is undesirable. While the interest from visitors in interacting with living creatures is evident by the popularity of touch-tanks and petting-pens, visitors must be protected from the specimens, and specimens from the visitors. The question therefore is how to introduce the benefits of interaction to assist informal education in a setting where direct tactile interaction is unfeasible (c.f. Figure 1)?

L. Miguel Encarnação

Papers

The virtual showcase: a projection-based multi-user augmented reality display

Merging Fossil Specimens with Computer- Information

Nahtlose integration von virtueller realität in gewohnte arbeitsplätze

Encouraging the Use of Visualization Technology

Game-based interaction technology for informal education in public settings.