Learn More
We present a spatial model of group interaction in virtual environments. The model aims to provide flexible and natural support for managing conversations among large groups gathered in virtual space. However, it can also be used to control more general interactions among other kinds of objects inhabiting such spaces. The model defines the key abstractions(More)
This paper explores the issue of user embodiment within collaborative virtual environments. By user embodiment we mean the provision of users with appropriate body images so as to represent them to others and also to themselves. By collaborative virtual environments we mean multiuser virtual reality systems which explicitly support cooperative work(More)
This paper explores the issue of user embodiment within collaborative virtual environments. By user embodiment we mean the provision of users with appropriate body images so as to represent them to others and also to themselves. By collaborative virtual environments we mean multiuser virtual reality systems which explicitly support cooperative work(More)
| To handle the complexity of virtual reality (VR) applications it is desirable to use a high level language. Languages such as Lisp, Prolog and Smalltalk do not support concur-rency, reactivity and real-time control which are vital for VR-applications. However the new concurrent constraint programming paradigm in general, and Oz in particular supports(More)
In a distributed shared synthetic environment with provisions for high quality 3D visualization and interaction, it is possible to implement a powerful variant of a rooms/space metaphor based on the concept of presence or proximity between participants in 3D space. This kind of model can be used as an interface between the user and the computer, for(More)
Ly49 receptors are inhibitory receptors expressed on subsets of both NK cells and NK1.1(+) T cells. The function of these receptors on NK cells is believed to be important in maintaining self-tolerance, yet their role on T cells is unclear. In this report we investigated how an Ly49A transgene alters T and NK cell development in an in vivo environment,(More)
This study aims to determine how the interaction of Ly49 receptors with MHC class I molecules shapes the development of the Ly49 repertoire. We have examined the percentage of NK cells that expressed Ly49A, Ly49G2, and Ly49D in single and double Ly49A/C-transgenic mice on four different MHC backgrounds, H-2(b), H-2(d), H-2(b/d), and(More)