Today’s network infrastructures are inadequate to cover the needs of small groups or new requirements that popup daily from the ever-increasing demand for more sophisticated services. Place-Oriented VPNs are based on the agent technology and can be built on top of existing infrastructure by any user. We expect that in the future this flexible, dynamic and low cost approach that supports not onl...

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We present a model where each of two players chooses between remuneration based on either private or team effort. Although at least one of the players has the equilibrium strategy to choose private remuneration, we frequently observe both players to choose team remuneration in a series of laboratory experiments. This allows for high cooperation payoffs but also provides individual free-riding i...

Die medizinische Lehre im klinischen Abschnitt ist geprägt durch die Ausbildung der Studierenden am Krankenbett. An der Charité wurde ein System entwickelt, mit dem diese Form der Lehre elektronisch unterstützt und partiell verbessert werden kann. Basis des Systems ist die audiovisuelle Kommunikation über Notebooks und ein Wireless LAN-gestütztes Lehrnetz, welches als VPN auf der IP-Infrastrukt...

In our previous work, we have proposed a new VPN architecture for enabling user-based multiply associated VPNs. In this paper, we implement a prototype system of a VPN that enables users to be associated with multiple VPNs using existing network technologies for demonstrating the feasibility of our architecture and for clarifying the service image of a multiple association service. Our prototyp...

Information security, sometimes shortened to Info Sec, is the practice of defending information from unauthorized access, use, disclosure, disruption, modification, perusal, inspection, recording or destruction. It is a general term that can be used regardless of the form the data may take (e.g. electronic, physical). Virtual private networks (VPNs) offer low-cost, secure, dynamic access to pri...