University of Leipzig

Displaying 1-13 of 13 results

  • White Papers // Nov 2012

    Mqr-Tree: A 2-Dimensional Spatial Access Method

    In this paper, the authors propose the mqr-tree, a two-dimensional spatial access method that organizes spatial objects in a two-dimensional node and based on their spatial relationships. Previously proposed spatial access methods that attempt to maintain spatial relationships between objects in their structures are limited in their incorporation of existing...

    Provided By University of Leipzig

  • White Papers // Jun 2011

    Was The Worldwide Asymmetry In Current Accounts Caused By The Macroeconomic Policy Of The Global Economy's Leader?

    Some authors sketch the causal chain that produced the current account surplus in China and the current account deficit of the US (as a part of global imbalances) as follows: declining interest rates in the US cause a redirection of capital flows into the periphery, rising capital inflows into China...

    Provided By University of Leipzig

  • White Papers // Apr 2011

    Analyzing the Effective Throughput in Multi-Hop IEEE 802.11n Networks

    In this paper, the authors characterize the effective throughput for multi-hop paths in IEEE 802.11n based wireless mesh networks. They derive an analytical model capturing the effects of frame aggregation and block acknowledgements, features found in the new IEEE 802.11n standard. They describe the throughput at MAC layer as a...

    Provided By University of Leipzig

  • White Papers // Mar 2011

    Understanding IEEE 802.11n Multi-Hop Communication in Wireless Networks

    In this paper, the authors present a measurement study of the multi-hop behavior of the new IEEE 802.11n standard in an indoor mesh testbed. As main contribution, they quantitatively describe characteristics of IEEE 802.11n on multi-hop paths like throughput, aggregate size and utilized MIMO features. Furthermore, they show how to...

    Provided By University of Leipzig

  • White Papers // Feb 2011

    Quantile Hedging For Multiple Assets Derivatives

    The problem of quantile hedging for multiple assets derivatives in the Black-Scholes model with correlation is considered. Explicit formulas for the probability maximizing function and the cost reduction function are derived. Applicability of the results for the widely traded derivatives as digital, quantos, outperformance and spread options is shown. As...

    Provided By University of Leipzig

  • White Papers // Oct 2010

    An Accurate and Analytically Tractable Model for Human Inter-Contact Times

    The authors present an analytically tractable mathematical approach for accurately modeling the distribution of inter-contact times between mobile devices carried by users. The contribution of this paper is two-fold: they show how to employ a MarkovModulated Poisson process (MMPP) for characterizing long-term dependencies in the mobility behavior, and they propose...

    Provided By University of Leipzig

  • White Papers // Apr 2010

    The Theory Of Optimum Currency Areas And Growth In Emerging Markets

    The authors test for the impact of exchange rate volatility on growth in emerging market economies based on the theory of optimum currency areas. The findings provide evidence for a positive impact of exchange rate stability on growth. The 1997/98 Asian crisis and the obligation of 12 new EU member...

    Provided By University of Leipzig

  • White Papers // Mar 2010

    A Scalable Dual-Radio Wireless Testbed for Emulating Mesh Networks

    In this paper, the authors introduce and evaluate ScaleMesh, a scalable miniaturized dual-radio wireless mesh testbed based on IEEE 802.11b/g technology. ScaleMesh can emulate large-scale mesh networks within a miniaturized experimentation area by adaptively shrinking the transmission range of mesh nodes by means of variable signal attenuators. To this end,...

    Provided By University of Leipzig

  • White Papers // Oct 2009

    CrossTrace: Cross-Layer Measurement for IEEE 802.11 Wireless Testbeds

    In this paper, the authors introduce and evaluate CrossTrace, a framework for performing cross-layer measurements in IEEE 802.11 based wireless networks. CrossTrace allows tracing of parameters at MAC-layer, routing and transport layer in a controlled environment and in a repeatable manner. Using CrossTrace, they conduct a comprehensive measurement study in...

    Provided By University of Leipzig

  • White Papers // Aug 2009

    Enhancing Customer Relationship Management Using Enterprise Information Integration With Topic Maps

    In most companies the landscape of used computer software is very heterogeneous; this causes a need for data integration. This is especially difficult to achieve for small and mid-sized enterprises, as they face the problem of relatively high costs for the existing standard solutions spread only on a small scale....

    Provided By University of Leipzig

  • White Papers // Jun 2009

    Enhancing Collaborative CRM With Mobile Technologies

    Mobile technology offers a high potential to significantly transform the ways how a company can interact with their customers and even with own employees. In recent years researchers started to analyze those potentials from the perspective of customer relationship management (CRM) but mainly concentrated on traditional business-to-customer (B2C) relationships. The...

    Provided By University of Leipzig

  • White Papers // May 2009

    A Clean-Slate Architecture for Reliable Data Delivery in Wireless Mesh Networks

    In this paper, the authors introduce clean-slate architecture for improving the delivery of data packets in IEEE 802.11 wireless mesh networks. Opposed to the rigid TCP/IP layer architecture which exhibits serious deficiencies in such networks, they propose a unitary layer approach that combines both routing and transport functionalities in a...

    Provided By University of Leipzig

  • White Papers // Nov 2008

    Practical Rate-Based Congestion Control for Wireless Mesh Networks

    This paper introduces an adaptive pacing scheme to overcome the drawbacks of TCP in wireless mesh networks with Internet connectivity. The pacing scheme is implemented at the wireless TCP sender as well as at the mesh gateway, and reacts according to the direction of TCP flows running across the wireless...

    Provided By University of Leipzig

  • White Papers // Nov 2008

    Practical Rate-Based Congestion Control for Wireless Mesh Networks

    This paper introduces an adaptive pacing scheme to overcome the drawbacks of TCP in wireless mesh networks with Internet connectivity. The pacing scheme is implemented at the wireless TCP sender as well as at the mesh gateway, and reacts according to the direction of TCP flows running across the wireless...

    Provided By University of Leipzig

  • White Papers // Jun 2009

    Enhancing Collaborative CRM With Mobile Technologies

    Mobile technology offers a high potential to significantly transform the ways how a company can interact with their customers and even with own employees. In recent years researchers started to analyze those potentials from the perspective of customer relationship management (CRM) but mainly concentrated on traditional business-to-customer (B2C) relationships. The...

    Provided By University of Leipzig

  • White Papers // Aug 2009

    Enhancing Customer Relationship Management Using Enterprise Information Integration With Topic Maps

    In most companies the landscape of used computer software is very heterogeneous; this causes a need for data integration. This is especially difficult to achieve for small and mid-sized enterprises, as they face the problem of relatively high costs for the existing standard solutions spread only on a small scale....

    Provided By University of Leipzig

  • White Papers // Feb 2011

    Quantile Hedging For Multiple Assets Derivatives

    The problem of quantile hedging for multiple assets derivatives in the Black-Scholes model with correlation is considered. Explicit formulas for the probability maximizing function and the cost reduction function are derived. Applicability of the results for the widely traded derivatives as digital, quantos, outperformance and spread options is shown. As...

    Provided By University of Leipzig

  • White Papers // Jun 2011

    Was The Worldwide Asymmetry In Current Accounts Caused By The Macroeconomic Policy Of The Global Economy's Leader?

    Some authors sketch the causal chain that produced the current account surplus in China and the current account deficit of the US (as a part of global imbalances) as follows: declining interest rates in the US cause a redirection of capital flows into the periphery, rising capital inflows into China...

    Provided By University of Leipzig

  • White Papers // Apr 2010

    The Theory Of Optimum Currency Areas And Growth In Emerging Markets

    The authors test for the impact of exchange rate volatility on growth in emerging market economies based on the theory of optimum currency areas. The findings provide evidence for a positive impact of exchange rate stability on growth. The 1997/98 Asian crisis and the obligation of 12 new EU member...

    Provided By University of Leipzig

  • White Papers // Mar 2010

    A Scalable Dual-Radio Wireless Testbed for Emulating Mesh Networks

    In this paper, the authors introduce and evaluate ScaleMesh, a scalable miniaturized dual-radio wireless mesh testbed based on IEEE 802.11b/g technology. ScaleMesh can emulate large-scale mesh networks within a miniaturized experimentation area by adaptively shrinking the transmission range of mesh nodes by means of variable signal attenuators. To this end,...

    Provided By University of Leipzig

  • White Papers // Apr 2011

    Analyzing the Effective Throughput in Multi-Hop IEEE 802.11n Networks

    In this paper, the authors characterize the effective throughput for multi-hop paths in IEEE 802.11n based wireless mesh networks. They derive an analytical model capturing the effects of frame aggregation and block acknowledgements, features found in the new IEEE 802.11n standard. They describe the throughput at MAC layer as a...

    Provided By University of Leipzig

  • White Papers // Mar 2011

    Understanding IEEE 802.11n Multi-Hop Communication in Wireless Networks

    In this paper, the authors present a measurement study of the multi-hop behavior of the new IEEE 802.11n standard in an indoor mesh testbed. As main contribution, they quantitatively describe characteristics of IEEE 802.11n on multi-hop paths like throughput, aggregate size and utilized MIMO features. Furthermore, they show how to...

    Provided By University of Leipzig

  • White Papers // Oct 2010

    An Accurate and Analytically Tractable Model for Human Inter-Contact Times

    The authors present an analytically tractable mathematical approach for accurately modeling the distribution of inter-contact times between mobile devices carried by users. The contribution of this paper is two-fold: they show how to employ a MarkovModulated Poisson process (MMPP) for characterizing long-term dependencies in the mobility behavior, and they propose...

    Provided By University of Leipzig

  • White Papers // Oct 2009

    CrossTrace: Cross-Layer Measurement for IEEE 802.11 Wireless Testbeds

    In this paper, the authors introduce and evaluate CrossTrace, a framework for performing cross-layer measurements in IEEE 802.11 based wireless networks. CrossTrace allows tracing of parameters at MAC-layer, routing and transport layer in a controlled environment and in a repeatable manner. Using CrossTrace, they conduct a comprehensive measurement study in...

    Provided By University of Leipzig

  • White Papers // May 2009

    A Clean-Slate Architecture for Reliable Data Delivery in Wireless Mesh Networks

    In this paper, the authors introduce clean-slate architecture for improving the delivery of data packets in IEEE 802.11 wireless mesh networks. Opposed to the rigid TCP/IP layer architecture which exhibits serious deficiencies in such networks, they propose a unitary layer approach that combines both routing and transport functionalities in a...

    Provided By University of Leipzig

  • White Papers // Nov 2012

    Mqr-Tree: A 2-Dimensional Spatial Access Method

    In this paper, the authors propose the mqr-tree, a two-dimensional spatial access method that organizes spatial objects in a two-dimensional node and based on their spatial relationships. Previously proposed spatial access methods that attempt to maintain spatial relationships between objects in their structures are limited in their incorporation of existing...

    Provided By University of Leipzig