Universitat Karlsruhe

Displaying 1-12 of 12 results

  • White Papers // Jan 2011

    PACMAN: Passive Autoconguration for Mobile Ad Hoc Networks

    Mobile Ad hoc NETworks (MANETs) enable the communication between mobile nodes via multi-hop wireless routes without depending on a communication infrastructure. In contrast, to infrastructure-based networks, MANETs support autonomous and spontaneous networking and, thus, should be capable of self-organization and -configuration. This paper presents PACMAN, a novel approach for the...

    Provided By Universitat Karlsruhe

  • White Papers // Sep 2009

    Gold Helix Photonic Metamaterial as Broadband Circular Polarizer

    The authors investigated propagation of light through a uniaxial photonic metamaterial composed of three-dimensional gold helices arranged on a two-dimensional square lattice. These nanostructures are fabricated via an approach based on direct laser writing into a positive-tone photoresist followed by electrochemical deposition of gold. For propagation of light along the...

    Provided By Universitat Karlsruhe

  • White Papers // Aug 2009

    Risk-Based Decision Support in Service Value Networks

    The current trend towards dynamic and highly scalable service provisioning fosters the rise of Software as a Service (SaaS) platforms and so called Compute Clouds. The on-demand provisioning of services gains more and more influence. For offering enriched services that are capable of performing complex tasks, the dynamic composition of...

    Provided By Universitat Karlsruhe

  • White Papers // Jul 2009

    SANDbed: A WSAN Testbed for Network Management and Energy Monitoring

    In this paper, the authors present their testbed SANDbed for wireless sensor actuator networks. In contrast to many existing testbed approaches for WSANs they concentrate their research on highly quantized and resolutive distributed energy monitoring in WSANs as well as on flexible management protocols for this kind of testbeds. Therefore,...

    Provided By Universitat Karlsruhe

  • White Papers // May 2009

    Cloud Computing - A Classification, Business Models, and Research Directions

    The paper describes a technical classification of Grid and Cloud Computing for a profound discussion on the business opportunities of the Cloud Computing paradigm. For this purpose, the paper presents a framework for business models in Clouds. With the help of this framework business models can be placed at infrastructure,...

    Provided By Universitat Karlsruhe

  • White Papers // May 2009

    Investment Timing, Liquidity, And Agency Costs Of Debt

    This paper examines the effect of debt and liquidity on corporate investment in a continuous-time framework. The authors show that stockholder-bondholder agency conflicts cause investment thresholds to be U-shaped in leverage and decreasing in liquidity. In the absence of tax effects, they derive the optimal level of liquid funds that...

    Provided By Universitat Karlsruhe

  • White Papers // Apr 2009

    Making Money With Clouds: Revenue Optimization Through Automated Policy Decisions

    Many existing IT applications exhibit strongly varying demand patterns for resources. Accommodating an ever increasing and highly fluctuating demand requires continuous availability of sufficient resources. To achieve this state at reasonably costs, a high degree of flexibility with respect to the given IT infrastructure is necessary. Facing this challenge the...

    Provided By Universitat Karlsruhe

  • White Papers // Mar 2009

    Secure Signaling in Next Generation Networks With NSIS

    The IETF working group Next Steps In Signaling (NSIS) develops signaling protocols for Quality-of-Service (QoS) reservations or dynamic NAT and FireWall (NAT/FW) configuration. QoS signaling allows for on-demand resource reservations in order to provide guaranteed quality-of-service for real-time oriented services in IP-based next generation networks whereas NAT/FW signaling allows for...

    Provided By Universitat Karlsruhe

  • White Papers // Feb 2009

    QuON - A Quad-Tree Based Overlay Protocol for Distributed Virtual Worlds

    Massively Multiplayer Online Games and Virtual Worlds are among the most popular applications on the Internet. As player numbers increase, the limits of the currently dominant client/server architecture are becoming obvious. In this paper, the authors propose a new distributed event dissemination protocol for VirtualWorlds and MMOGs. This protocol is...

    Provided By Universitat Karlsruhe

  • White Papers // Jan 2009

    A Seamless Virtualization Approach for Transparent Dynamical Function Mapping Targeting Heterogeneous and Reconfigurable Systems

    Future systems are not only heading towards increased parallelism, but also embrace heterogeneity and reconfigurability. This paper therefore presents an approach targeting comfortable program development and execution, enabling full exploitation of the underlying hardware without burdening the application programmer with the details of the underlying hardware infrastructure. The approach employs...

    Provided By Universitat Karlsruhe

  • White Papers // Nov 2008

    Banishing Patch-Cables From LAN Parties Using Ad-Hoc P2P Multicast as a Substitute?

    Although playing real-time multi-player games online over the Internet became more and more popular in the past few years, people still enjoy meeting for so-called "LAN Parties" because of higher social interaction. As the number of participants increases, the deployment of the required infrastructure (i.e., the LAN) however gets more...

    Provided By Universitat Karlsruhe

  • White Papers // Nov 2008

    Secure Computability of Functions in the IT Setting With Dishonest Majority and Applications to Long-Term Security

    It is well known that general Secure Function Evaluation (SFE) with Information-Theoretical (IT) security is infeasible in presence of a corrupted majority in the standard model. On the other hand, there are SFE protocols (Goldreich et al. [STOC'87]) that are computationally secure (without fairness) in presence of an actively corrupted...

    Provided By Universitat Karlsruhe

  • White Papers // Apr 2009

    Making Money With Clouds: Revenue Optimization Through Automated Policy Decisions

    Many existing IT applications exhibit strongly varying demand patterns for resources. Accommodating an ever increasing and highly fluctuating demand requires continuous availability of sufficient resources. To achieve this state at reasonably costs, a high degree of flexibility with respect to the given IT infrastructure is necessary. Facing this challenge the...

    Provided By Universitat Karlsruhe

  • White Papers // May 2009

    Cloud Computing - A Classification, Business Models, and Research Directions

    The paper describes a technical classification of Grid and Cloud Computing for a profound discussion on the business opportunities of the Cloud Computing paradigm. For this purpose, the paper presents a framework for business models in Clouds. With the help of this framework business models can be placed at infrastructure,...

    Provided By Universitat Karlsruhe

  • White Papers // Aug 2009

    Risk-Based Decision Support in Service Value Networks

    The current trend towards dynamic and highly scalable service provisioning fosters the rise of Software as a Service (SaaS) platforms and so called Compute Clouds. The on-demand provisioning of services gains more and more influence. For offering enriched services that are capable of performing complex tasks, the dynamic composition of...

    Provided By Universitat Karlsruhe

  • White Papers // Jan 2009

    A Seamless Virtualization Approach for Transparent Dynamical Function Mapping Targeting Heterogeneous and Reconfigurable Systems

    Future systems are not only heading towards increased parallelism, but also embrace heterogeneity and reconfigurability. This paper therefore presents an approach targeting comfortable program development and execution, enabling full exploitation of the underlying hardware without burdening the application programmer with the details of the underlying hardware infrastructure. The approach employs...

    Provided By Universitat Karlsruhe

  • White Papers // May 2009

    Investment Timing, Liquidity, And Agency Costs Of Debt

    This paper examines the effect of debt and liquidity on corporate investment in a continuous-time framework. The authors show that stockholder-bondholder agency conflicts cause investment thresholds to be U-shaped in leverage and decreasing in liquidity. In the absence of tax effects, they derive the optimal level of liquid funds that...

    Provided By Universitat Karlsruhe

  • White Papers // Nov 2008

    Secure Computability of Functions in the IT Setting With Dishonest Majority and Applications to Long-Term Security

    It is well known that general Secure Function Evaluation (SFE) with Information-Theoretical (IT) security is infeasible in presence of a corrupted majority in the standard model. On the other hand, there are SFE protocols (Goldreich et al. [STOC'87]) that are computationally secure (without fairness) in presence of an actively corrupted...

    Provided By Universitat Karlsruhe

  • White Papers // Sep 2009

    Gold Helix Photonic Metamaterial as Broadband Circular Polarizer

    The authors investigated propagation of light through a uniaxial photonic metamaterial composed of three-dimensional gold helices arranged on a two-dimensional square lattice. These nanostructures are fabricated via an approach based on direct laser writing into a positive-tone photoresist followed by electrochemical deposition of gold. For propagation of light along the...

    Provided By Universitat Karlsruhe

  • White Papers // Jan 2011

    PACMAN: Passive Autoconguration for Mobile Ad Hoc Networks

    Mobile Ad hoc NETworks (MANETs) enable the communication between mobile nodes via multi-hop wireless routes without depending on a communication infrastructure. In contrast, to infrastructure-based networks, MANETs support autonomous and spontaneous networking and, thus, should be capable of self-organization and -configuration. This paper presents PACMAN, a novel approach for the...

    Provided By Universitat Karlsruhe

  • White Papers // Feb 2009

    QuON - A Quad-Tree Based Overlay Protocol for Distributed Virtual Worlds

    Massively Multiplayer Online Games and Virtual Worlds are among the most popular applications on the Internet. As player numbers increase, the limits of the currently dominant client/server architecture are becoming obvious. In this paper, the authors propose a new distributed event dissemination protocol for VirtualWorlds and MMOGs. This protocol is...

    Provided By Universitat Karlsruhe

  • White Papers // Mar 2009

    Secure Signaling in Next Generation Networks With NSIS

    The IETF working group Next Steps In Signaling (NSIS) develops signaling protocols for Quality-of-Service (QoS) reservations or dynamic NAT and FireWall (NAT/FW) configuration. QoS signaling allows for on-demand resource reservations in order to provide guaranteed quality-of-service for real-time oriented services in IP-based next generation networks whereas NAT/FW signaling allows for...

    Provided By Universitat Karlsruhe

  • White Papers // Jul 2009

    SANDbed: A WSAN Testbed for Network Management and Energy Monitoring

    In this paper, the authors present their testbed SANDbed for wireless sensor actuator networks. In contrast to many existing testbed approaches for WSANs they concentrate their research on highly quantized and resolutive distributed energy monitoring in WSANs as well as on flexible management protocols for this kind of testbeds. Therefore,...

    Provided By Universitat Karlsruhe

  • White Papers // Nov 2008

    Banishing Patch-Cables From LAN Parties Using Ad-Hoc P2P Multicast as a Substitute?

    Although playing real-time multi-player games online over the Internet became more and more popular in the past few years, people still enjoy meeting for so-called "LAN Parties" because of higher social interaction. As the number of participants increases, the deployment of the required infrastructure (i.e., the LAN) however gets more...

    Provided By Universitat Karlsruhe