University of Hamburg

Displaying 1-13 of 13 results

  • White Papers // Mar 2012

    Evaluations and Measurements of a Transmitter Delay Diversity System for DRM+

    In this paper the hardware setup and a field trial of a transmitter Delay Diversity (DD) system for DRM+ (Digital Radio Mondiale, Mode E) in 'Urban' areas in the city of Hannover are presented. DD should help against destructive interferences resulting in signal dropouts, especially for slow receiver velocities. A...

    Provided By University of Hamburg

  • White Papers // Jan 2012

    Analysis of Mobile Agents Using Invariants of Object Nets

    Mobility induces new challenges for dynamic systems, which need a new conceptional treatment: systems that deal for example with mobile agents need extended security concepts to handle the risks, induced by foreign, untrusted agents. In this contribution the authors use object nets to model mobile systems. Object nets are Petri...

    Provided By University of Hamburg

  • White Papers // Aug 2011

    Improving Cooperation in Mobile Ad Hoc Networks

    Consider a Mobile Ad hoc NETwork (MANET) where the mobile nodes act as relays to form multi-hop routes connecting origin-destination node pairs that are out of radio transmission range with respect to each other. If the nodes do not to belong the same authority, then a protocol must be deployed...

    Provided By University of Hamburg

  • White Papers // Feb 2011

    Inflation Perceptions And Expectations In Sweden ? Are Media Reports The 'Missing Link'?

    Using quantitative survey data from the Swedish Consumer Tendency Survey as well as a unique data set on media reports about inflation, the authors analyze the formation process of inflation perceptions and expectations as well as interrelations between the variables. Throughout the analysis, the role of media reports about inflation...

    Provided By University of Hamburg

  • White Papers // Jan 2010

    Video Conferencing in a Transregional Research Cooperation: Turn−Taking in a New Medium

    Compared to more common media of communication such as telephone or e−mail, Video Conferences (VCs) provide further communicational resources for the interactants by allowing for visual cues that are suspected to play a major role in discourse management, cognitive and affective processing. Video-conferencing furthermore has a number of practical advantages...

    Provided By University of Hamburg

  • White Papers // Sep 2009

    Virtual Micro-Politics: Informal Tactics of Influence and Power in Inter-Organizational Networks

    Although virtual organizations and networks have been studied for quite some time, there is still need for research regarding their inner dynamics and the mechanisms of leadership and governance. In this paper, the authors investigate micro-political processes - i.e. informal actions of individual actors to gain power and exert influence,...

    Provided By University of Hamburg

  • White Papers // Jul 2009

    Prospect Theory And Inflation Perceptions - An Empirical Assessment

    Building on the hypotheses of loss aversion with respect to price increases and availability of frequently bought goods, Brachinger (2006, 2008) constructs an alternative Index of Perceived Inflation (IPI), which can reproduce the jump in the measure for perceived inflation after the Euro introduction in Germany that was not observable...

    Provided By University of Hamburg

  • White Papers // Jul 2009

    Stimulating Cooperation in Mobile Ad Hoc Networks

    Consider a Mobile Ad hoc NETwork (MANET) where packet transmissions occur between mobile nodes. Such a network requires that the nodes act as relays to form multi-hop routes connecting the origin-destination node pairs that are out of radio transmission range with respect to each other. If the nodes do not...

    Provided By University of Hamburg

  • White Papers // Mar 2009

    Human Resouce Management Systems, Dynamic Capabilities And Environmental Dynamics: A Practice Theoretical Analysis

    Firms compete in differently dynamic environments. Their SHRM systems need to develop different dynamic capabilities for dealing with market dynamics. In this paper, the author investigates the contribution of a control (Internal Labor Market) and a commitment (High-Commitment) SHRM system to cultivate dynamic capabilities. Both generic SHRM systems are underpinned...

    Provided By University of Hamburg

  • White Papers // Mar 2009

    Towards an Extensible Agent-Based Middleware for Sensor Networks and RFID Systems

    Sensor networks as well as RFID systems are among the hyped technologies nowadays. A lot of research e orts have been spent to develop standards, middleware and applications. The industry already made large investments to foster the adoption of these technologies, consequently pushing the development, and already deployed the resulting...

    Provided By University of Hamburg

  • White Papers // Oct 2008

    The Cost Impact of Spam Filters: Measuring the Effect of Information System Technologies in Organizations

    More than 70% of global e-mail traffic consists of unsolicited and commercial direct marketing, also known as spam. Dealing with spam incurs high costs for organizations, prompting efforts to try to reduce spam-related costs by installing spam filters. Using modern econometric methods to reduce the selection bias of installing a...

    Provided By University of Hamburg

  • White Papers // Sep 2008

    XSSDS: Server-side Detection of Cross-site Scripting Attacks

    Cross-site Scripting (XSS) has emerged as one of the most prevalent type of security vulnerabilities. While the reason for the vulnerability primarily lies on the server-side, the actual exploitation is within the victim's web browser on the client-side. Therefore, an operator of a web application has only very limited evidence...

    Provided By University of Hamburg

  • White Papers // May 2007

    Using Event-Driven Process Chains for Model-Driven Development of Business Applications

    Web services provide a standardized way of accessing functionality over networks. Most beneficial is their use if many Web services are composed in order to develop an application. Due to their nature, Web services can be used to support businesses if their composition matches the underlying business processes. However, the...

    Provided By University of Hamburg

  • White Papers // Oct 2008

    The Cost Impact of Spam Filters: Measuring the Effect of Information System Technologies in Organizations

    More than 70% of global e-mail traffic consists of unsolicited and commercial direct marketing, also known as spam. Dealing with spam incurs high costs for organizations, prompting efforts to try to reduce spam-related costs by installing spam filters. Using modern econometric methods to reduce the selection bias of installing a...

    Provided By University of Hamburg

  • White Papers // Sep 2008

    XSSDS: Server-side Detection of Cross-site Scripting Attacks

    Cross-site Scripting (XSS) has emerged as one of the most prevalent type of security vulnerabilities. While the reason for the vulnerability primarily lies on the server-side, the actual exploitation is within the victim's web browser on the client-side. Therefore, an operator of a web application has only very limited evidence...

    Provided By University of Hamburg

  • White Papers // Jan 2010

    Video Conferencing in a Transregional Research Cooperation: Turn−Taking in a New Medium

    Compared to more common media of communication such as telephone or e−mail, Video Conferences (VCs) provide further communicational resources for the interactants by allowing for visual cues that are suspected to play a major role in discourse management, cognitive and affective processing. Video-conferencing furthermore has a number of practical advantages...

    Provided By University of Hamburg

  • White Papers // Mar 2009

    Towards an Extensible Agent-Based Middleware for Sensor Networks and RFID Systems

    Sensor networks as well as RFID systems are among the hyped technologies nowadays. A lot of research e orts have been spent to develop standards, middleware and applications. The industry already made large investments to foster the adoption of these technologies, consequently pushing the development, and already deployed the resulting...

    Provided By University of Hamburg

  • White Papers // Mar 2009

    Human Resouce Management Systems, Dynamic Capabilities And Environmental Dynamics: A Practice Theoretical Analysis

    Firms compete in differently dynamic environments. Their SHRM systems need to develop different dynamic capabilities for dealing with market dynamics. In this paper, the author investigates the contribution of a control (Internal Labor Market) and a commitment (High-Commitment) SHRM system to cultivate dynamic capabilities. Both generic SHRM systems are underpinned...

    Provided By University of Hamburg

  • White Papers // Feb 2011

    Inflation Perceptions And Expectations In Sweden ? Are Media Reports The 'Missing Link'?

    Using quantitative survey data from the Swedish Consumer Tendency Survey as well as a unique data set on media reports about inflation, the authors analyze the formation process of inflation perceptions and expectations as well as interrelations between the variables. Throughout the analysis, the role of media reports about inflation...

    Provided By University of Hamburg

  • White Papers // Jul 2009

    Prospect Theory And Inflation Perceptions - An Empirical Assessment

    Building on the hypotheses of loss aversion with respect to price increases and availability of frequently bought goods, Brachinger (2006, 2008) constructs an alternative Index of Perceived Inflation (IPI), which can reproduce the jump in the measure for perceived inflation after the Euro introduction in Germany that was not observable...

    Provided By University of Hamburg

  • White Papers // Sep 2009

    Virtual Micro-Politics: Informal Tactics of Influence and Power in Inter-Organizational Networks

    Although virtual organizations and networks have been studied for quite some time, there is still need for research regarding their inner dynamics and the mechanisms of leadership and governance. In this paper, the authors investigate micro-political processes - i.e. informal actions of individual actors to gain power and exert influence,...

    Provided By University of Hamburg

  • White Papers // Jul 2009

    Stimulating Cooperation in Mobile Ad Hoc Networks

    Consider a Mobile Ad hoc NETwork (MANET) where packet transmissions occur between mobile nodes. Such a network requires that the nodes act as relays to form multi-hop routes connecting the origin-destination node pairs that are out of radio transmission range with respect to each other. If the nodes do not...

    Provided By University of Hamburg

  • White Papers // Aug 2011

    Improving Cooperation in Mobile Ad Hoc Networks

    Consider a Mobile Ad hoc NETwork (MANET) where the mobile nodes act as relays to form multi-hop routes connecting origin-destination node pairs that are out of radio transmission range with respect to each other. If the nodes do not to belong the same authority, then a protocol must be deployed...

    Provided By University of Hamburg

  • White Papers // Jan 2012

    Analysis of Mobile Agents Using Invariants of Object Nets

    Mobility induces new challenges for dynamic systems, which need a new conceptional treatment: systems that deal for example with mobile agents need extended security concepts to handle the risks, induced by foreign, untrusted agents. In this contribution the authors use object nets to model mobile systems. Object nets are Petri...

    Provided By University of Hamburg

  • White Papers // Mar 2012

    Evaluations and Measurements of a Transmitter Delay Diversity System for DRM+

    In this paper the hardware setup and a field trial of a transmitter Delay Diversity (DD) system for DRM+ (Digital Radio Mondiale, Mode E) in 'Urban' areas in the city of Hannover are presented. DD should help against destructive interferences resulting in signal dropouts, especially for slow receiver velocities. A...

    Provided By University of Hamburg

  • White Papers // May 2007

    Using Event-Driven Process Chains for Model-Driven Development of Business Applications

    Web services provide a standardized way of accessing functionality over networks. Most beneficial is their use if many Web services are composed in order to develop an application. Due to their nature, Web services can be used to support businesses if their composition matches the underlying business processes. However, the...

    Provided By University of Hamburg