We study connection networks in which certain pairs of nodes have to be connected by k edge-disjoint paths, and study bounds for the minimal sum of lengths of such k paths. We define the related notions of totalk-distance for a pair of nodes and totalk-diameter of a connection network, and study the value TDk(d) which is the maximal such totalk-diameter of a network with diameter d. These notio...

Restrictions of interactivity in dialogue are often seen as having negative impact on the efficiency of the dialogue, as they affect the ability to give immediate feedback (Whittaker, 2003). We have conducted experiments with one such restriction common in spoken dialogue systems, namely push-totalk. While our results confirm many predictions from the literature (fewer but longer turns; reducti...

This paper proposes iPTT, a peer-to-peer Push-toTalk (PTT) service for Voice over IP (VoIP). In iPTT, a distributed and mobile-operator independent network architecture is presented to accelerate the deployment of the PTT service. Based on the proposed architecture, the message flows for call establishment/teardown are designed to show the feasibility of iPTT. Also, we propose two mechanisms fo...

The wireless telecommunication industry is now slowly shifting the paradigm from circuit-switched voice-alone network to an integrated packet switched architecture. This will facilitate variety of new multimedia applications, in the same infrastructure, in a cost-efficient way. However, it is important to use the legacy 2.5G access systems as much as possible, to make the transition smooth. The...

European Journal of Information Systems (2008) 17, 1–3. doi:10.1057/ejis.2008.1 Six excellent articles are yours in this issue of EJIS To what degree do we adopt IT because it’s just plain ‘fun’? Is this ‘fun’ motive seriously influenced by the opinions of those around us? From three Vienna Universities, Dickinger, Arami, and Meyer join those bold researchers who investigate the adoption of IT ...