377,250 research outputs found
USAge of Groupware in Software Engineering Education at the Cscw Laboratory of University Duisburg-essen: Possibilities and Limitations
This paper analyzes the application level in CSCW laboratory there are Electronic meeting rooms, Video Conferencing, Desktop Conference (Passenger), and BSCW system which conducting in The University Duisburg â Essen Germany. This analysis included short analysis and discussion about possibilities and limitation of each experiment followed by outlook how this lab can be further developed.Multi-user to Multipoint Videoconferences is introduced to cover all of devices join to the conferences. A computer network, PSTN (Public Switched Telephone Network), ISDN Phone, Wireless Infrastructures (accessed by laptop, smart phone, PDA) and videoconferences systems is proposed to be integrate
ALEX: Improving SIP Support in Systems with Multiple Network Addresses
The successful and increasingly adopted session initiation protocol (SIP) does not adequately support hosts with multiple network addresses, such as dual-stack (IPv4-IPv6) or IPv6 multi-homed devices. This paper presents the Address List Extension (ALEX) to SIP that adds effective support to systems with multiple addresses, such as dual-stack hosts or multi-homed IPv6 hosts. ALEX enables IPv6 transport to be used for SIP messages, as well as for communication sessions between SIP user agents (UAs), whenever possible and without compromising compatibility with ALEX-unaware UAs and SIP servers
A two-way interactive broadband satellite architecture to break the digital divide barrier
September 24-26, 2007, Turin, Ital
Directed quantum communication
We raise the question whether there is a way to characterize the quantum
information transport properties of a medium or material. For this analysis the
special features of quantum information have to be taken into account. We find
that quantum communication over an isotropic medium, as opposed to classical
information transfer, requires the transmitter to direct the signal towards the
receiver. Furthermore, for large classes of media there is a threshold, in the
sense that `sufficiently much' of the signal has to be collected. Therefore,
the medium's capacity for quantum communication can be characterized in terms
of how the size of the transmitter and receiver has to scale with the
transmission distance to maintain quantum information transmission. To
demonstrate the applicability of this concept, an n-dimensional spin lattice is
considered, yielding a sufficient scaling of d^(n/3) with the distance d
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