University of Bonn

Displaying 1-22 of 22 results

  • White Papers // May 2011

    Performance Pay And Multidimensional Sorting - Productivity, Preferences And Gender

    This paper studies the impact of incentives on worker self-selection in a controlled laboratory experiment. Subjects face the choice between a fixed and a variable payment scheme. Depending on the treatment, the variable payment is a piece rate, a tournament or a revenue-sharing scheme. The authors find that output is...

    Provided By University of Bonn

  • White Papers // Mar 2011

    Wormhole Detection Using Topology Graph Based Anomaly Detection

    Routing attacks are a serious threat to communication in tactical MANETs. TOGBAD is a centralised approach, using topology graphs to detect such attacks. In this paper, the authors present TOGBAD's newly added wormhole detection capability. It is an adaptation of a wormhole detection method developed by Hu et al. This...

    Provided By University of Bonn

  • White Papers // Jan 2011

    Global Banking And International Business Cycles

    This paper incorporates a global bank into a two-country business cycle model. The bank collects deposits from households and makes loans to entrepreneurs, in both countries. It has to finance a fraction of loans using equity. The authors investigate how such a bank capital requirement affects the international transmission of...

    Provided By University of Bonn

  • White Papers // Dec 2010

    Is Wine A Financial Parachute?

    This paper analyzes the relationship between Global Wine Industry Share Price Indexes and composite stock market indexes using a Threshold Vector Error Correction Model (TVECM), aiming to investigate if investments in the wine sector play a role in determining financial risk and return to investors who include it in their...

    Provided By University of Bonn

  • White Papers // Sep 2010

    In Search Of An Evolutionary Edge: Trading With A Few, More, Or Many

    Consider a population of farmers who live around a lake. Each farmer engages in trade with his m adjacent neighbors, where m is termed the "Span of interaction." Trade is governed by a prisoner's dilemma "Rule of engagement." A farmer's payoff is the sum of the payoffs from the m...

    Provided By University of Bonn

  • White Papers // Jun 2010

    Collaborative Business Process Modeling - Tool Support for Solving Typical Problems

    The paper studies typical problems that arise in collaborative modeling of business processes. The authors have used a design science approach to study collaborative modeling of business processes. Following this they have first designed a collaborative modeling architecture based on the empirical findings in a modeling study using conventional tools....

    Provided By University of Bonn

  • White Papers // Feb 2010

    Success Factors of e-Collaboration in Business Process Modeling

    The authors identify the success factors of collaborative modeling of business processes by a qualitative analysis of the experiences of participants in group modeling sessions. The factors and their relations form a preliminary theoretical model of collaboration in modeling that extends existing models. The insights from this guided the improvement...

    Provided By University of Bonn

  • White Papers // Feb 2010

    Dynamic Effects Of Foreign Direct Investment When Credit Markets Are Imperfect

    This paper argues that foreign direct investment in economies with credit market imperfections may increase their vulnerability to capital flow shocks. Due to better access to financial markets foreign firms can use other wage contracts than domestic ones. This alters the domestic wage composition and the subsequent wealth distribution. When...

    Provided By University of Bonn

  • White Papers // Jan 2010

    Improved Approximation Algorithms for the Quality of Service Multicast Tree Problem

    This paper has considered a generalization of the Steiner problem in which each node possesses a rate and the cost of an edge. This paper have given improved approximation algorithms finding trees with a cost at most 1.960 (Respectively 3.802) times the minimum cost for the case of two (Respectively...

    Provided By University of Bonn

  • White Papers // Oct 2009

    Breach Remedies Including Hybrid Investments

    The authors show that parties in bilateral trade can rely on the default common law breach remedy of 'Expectation damages' to induce simultaneously first-best relationship-specific investments of both the selfish and the cooperative kind. This can be achieved by writing a contract that specifies a sufficiently high quality level. In...

    Provided By University of Bonn

  • White Papers // Oct 2009

    Foreign Direct Investment In The Agricultural Sector In Ethiopia

    Global Foreign Direct Investment (FDI) inflows rose in 2007, after four consecutive years of growth, by 30% to reach $1,833 billion, well above the previous all-time high set in 2000 (UNCTAD, 2008). Especially in developing countries FDI inflows reached their highest level ever ($500 billion) - a 21% increase over...

    Provided By University of Bonn

  • White Papers // Aug 2009

    Convex Groups for Self-Organizing Multi-Sink Wireless Sensor Networks

    Mobile ad-hoc networks have long been proposed for rescue scenarios to support and coordinate the efforts of helpers. Low power wireless sensor networks are a natural extension of this approach. They can provide valuable environmental data enriched with location information to deepen the insight of the operational area. Gateways between...

    Provided By University of Bonn

  • White Papers // Jul 2009

    A Classification Scheme for Update Propagation Methods in Deductive Databases

    Incremental view re-computation is a well-established research topic in deductive databases and plenty of update propagation methods have been proposed within the last two decades. All these approaches essentially apply the same propagation technique but differ in the way they are realized, the focus they provide to the induced changes...

    Provided By University of Bonn

  • White Papers // Jun 2009

    Detecting Moving Objects in Noisy Radar Data Using a Relational Database

    In moving object databases, many authors assume that number and position of objects to be processed are always known in advance. Detecting an unknown moving object and pursuing its movement, however, is usually left to tracking algorithms outside the database in which the sensor data needed is actually stored. In...

    Provided By University of Bonn

  • White Papers // Jun 2009

    SQL Triggers Reacting on Time Events: An Extension Proposal

    Being able to activate triggers at timepoints reached or after time intervals elapsed has been acknowledged by many authors as a valuable functionality of a DBMS. Recently, the interest in time-based triggers has been renewed in the context of data stream monitoring. However, up till now SQL triggers react to...

    Provided By University of Bonn

  • White Papers // Jun 2009

    Optimal Casualty Insurance, Repair, And Regulation In The Presence Of A Securities Market

    Insurance regulation is often based on keeping probabilities of failure small and not on any explicit analysis of economic trade-offs. The authors build a simple economic model of optimal casualty insurance based on a story about insuring a house. This is done in the presence of a securities market that...

    Provided By University of Bonn

  • White Papers // Jun 2009

    Investment And The Holdup Problem In A Matching Market

    This paper studies investment incentives in the steady state of a dynamic bilateral matching market. Because of search frictions, both parties in a match are partially locked-in when they bargain over the joint surplus from their sunk investments. The associated holdup problem depends on market conditions and is more important...

    Provided By University of Bonn

  • White Papers // May 2009

    Regulatory SPS Instruments In Meat Trade

    Policy makers have to choose between different potentially risk-reducing instruments regulating agri-food trade. Analysing the meat sector, the paper aims at identifying least trade distorting regulations for different policy goals relevant to the SPS agreement. For this purpose, a non-linear gravity model is estimated by Poisson pseudo-maximum likelihood and applied...

    Provided By University of Bonn

  • White Papers // Mar 2009

    Enlighten Me! Secure Key Assignment in Wireless Sensor Networks

    The availability of secret keys is a precondition for the use of many security solutions and protocols. However, securely assigning such keys to nodes is a challenging task in the context of wireless sensor networks. In this paper, the authors present a novel solution for a secure key assignment in...

    Provided By University of Bonn

  • White Papers // Feb 2009

    Compressive Estimation of Doubly Selective Channels: Exploiting Channel Sparsity to Improve Spectral Efficiency in Multicarrier Transmissions

    The authors consider the estimation of doubly selective wireless channels within pulse-shaping multicarrier systems (which include OFDM systems as a special case). A pilot-assisted channel estimation technique using the methodology of Compressed Sensing (CS) is proposed. By exploiting a channel's delay-Doppler sparsity, CS-based channel estimation allows an increase in spectral...

    Provided By University of Bonn

  • White Papers // Feb 2009

    Integration and Visualization of Dynamic Sensor Data Into 3D Spatial Data Infrastructures in a Standardized Way

    Integrating actual sensor data, such as weather or environmental information can improve the value of Geographical Information Systems (GIS) enormously. These applications are nowadays supported by Spatial Data Infrastructures (SDI) in order to find, access and utilize relevant geodata. In contrast to the mostly static data in conventional Spatial Data...

    Provided By University of Bonn

  • White Papers // Jan 2009

    Demo Abstract: Towards Interoperability Testing for Wireless Sensor Networks With COOJA/MSPSim

    Wireless sensor networks are moving towards emerging standards such as IP, ZigBee and WirelessHART which makes interoperability testing important. Interoperability testing is today performed through black-box testing with vendors physically meeting to test their equipment. For interoperability testing of these standards, a white-box approach is desired, since it gives both...

    Provided By University of Bonn

  • White Papers // Feb 2009

    Integration and Visualization of Dynamic Sensor Data Into 3D Spatial Data Infrastructures in a Standardized Way

    Integrating actual sensor data, such as weather or environmental information can improve the value of Geographical Information Systems (GIS) enormously. These applications are nowadays supported by Spatial Data Infrastructures (SDI) in order to find, access and utilize relevant geodata. In contrast to the mostly static data in conventional Spatial Data...

    Provided By University of Bonn

  • White Papers // Oct 2009

    Foreign Direct Investment In The Agricultural Sector In Ethiopia

    Global Foreign Direct Investment (FDI) inflows rose in 2007, after four consecutive years of growth, by 30% to reach $1,833 billion, well above the previous all-time high set in 2000 (UNCTAD, 2008). Especially in developing countries FDI inflows reached their highest level ever ($500 billion) - a 21% increase over...

    Provided By University of Bonn

  • White Papers // Jan 2010

    Improved Approximation Algorithms for the Quality of Service Multicast Tree Problem

    This paper has considered a generalization of the Steiner problem in which each node possesses a rate and the cost of an edge. This paper have given improved approximation algorithms finding trees with a cost at most 1.960 (Respectively 3.802) times the minimum cost for the case of two (Respectively...

    Provided By University of Bonn

  • White Papers // Jan 2011

    Global Banking And International Business Cycles

    This paper incorporates a global bank into a two-country business cycle model. The bank collects deposits from households and makes loans to entrepreneurs, in both countries. It has to finance a fraction of loans using equity. The authors investigate how such a bank capital requirement affects the international transmission of...

    Provided By University of Bonn

  • White Papers // May 2011

    Performance Pay And Multidimensional Sorting - Productivity, Preferences And Gender

    This paper studies the impact of incentives on worker self-selection in a controlled laboratory experiment. Subjects face the choice between a fixed and a variable payment scheme. Depending on the treatment, the variable payment is a piece rate, a tournament or a revenue-sharing scheme. The authors find that output is...

    Provided By University of Bonn

  • White Papers // Sep 2010

    In Search Of An Evolutionary Edge: Trading With A Few, More, Or Many

    Consider a population of farmers who live around a lake. Each farmer engages in trade with his m adjacent neighbors, where m is termed the "Span of interaction." Trade is governed by a prisoner's dilemma "Rule of engagement." A farmer's payoff is the sum of the payoffs from the m...

    Provided By University of Bonn

  • White Papers // May 2009

    Regulatory SPS Instruments In Meat Trade

    Policy makers have to choose between different potentially risk-reducing instruments regulating agri-food trade. Analysing the meat sector, the paper aims at identifying least trade distorting regulations for different policy goals relevant to the SPS agreement. For this purpose, a non-linear gravity model is estimated by Poisson pseudo-maximum likelihood and applied...

    Provided By University of Bonn

  • White Papers // Dec 2010

    Is Wine A Financial Parachute?

    This paper analyzes the relationship between Global Wine Industry Share Price Indexes and composite stock market indexes using a Threshold Vector Error Correction Model (TVECM), aiming to investigate if investments in the wine sector play a role in determining financial risk and return to investors who include it in their...

    Provided By University of Bonn

  • White Papers // Aug 2009

    Convex Groups for Self-Organizing Multi-Sink Wireless Sensor Networks

    Mobile ad-hoc networks have long been proposed for rescue scenarios to support and coordinate the efforts of helpers. Low power wireless sensor networks are a natural extension of this approach. They can provide valuable environmental data enriched with location information to deepen the insight of the operational area. Gateways between...

    Provided By University of Bonn

  • White Papers // Mar 2009

    Enlighten Me! Secure Key Assignment in Wireless Sensor Networks

    The availability of secret keys is a precondition for the use of many security solutions and protocols. However, securely assigning such keys to nodes is a challenging task in the context of wireless sensor networks. In this paper, the authors present a novel solution for a secure key assignment in...

    Provided By University of Bonn

  • White Papers // Feb 2010

    Dynamic Effects Of Foreign Direct Investment When Credit Markets Are Imperfect

    This paper argues that foreign direct investment in economies with credit market imperfections may increase their vulnerability to capital flow shocks. Due to better access to financial markets foreign firms can use other wage contracts than domestic ones. This alters the domestic wage composition and the subsequent wealth distribution. When...

    Provided By University of Bonn

  • White Papers // Jan 2009

    Demo Abstract: Towards Interoperability Testing for Wireless Sensor Networks With COOJA/MSPSim

    Wireless sensor networks are moving towards emerging standards such as IP, ZigBee and WirelessHART which makes interoperability testing important. Interoperability testing is today performed through black-box testing with vendors physically meeting to test their equipment. For interoperability testing of these standards, a white-box approach is desired, since it gives both...

    Provided By University of Bonn

  • White Papers // Oct 2009

    Breach Remedies Including Hybrid Investments

    The authors show that parties in bilateral trade can rely on the default common law breach remedy of 'Expectation damages' to induce simultaneously first-best relationship-specific investments of both the selfish and the cooperative kind. This can be achieved by writing a contract that specifies a sufficiently high quality level. In...

    Provided By University of Bonn

  • White Papers // Jun 2009

    Investment And The Holdup Problem In A Matching Market

    This paper studies investment incentives in the steady state of a dynamic bilateral matching market. Because of search frictions, both parties in a match are partially locked-in when they bargain over the joint surplus from their sunk investments. The associated holdup problem depends on market conditions and is more important...

    Provided By University of Bonn

  • White Papers // Jun 2009

    Optimal Casualty Insurance, Repair, And Regulation In The Presence Of A Securities Market

    Insurance regulation is often based on keeping probabilities of failure small and not on any explicit analysis of economic trade-offs. The authors build a simple economic model of optimal casualty insurance based on a story about insuring a house. This is done in the presence of a securities market that...

    Provided By University of Bonn

  • White Papers // Feb 2009

    Compressive Estimation of Doubly Selective Channels: Exploiting Channel Sparsity to Improve Spectral Efficiency in Multicarrier Transmissions

    The authors consider the estimation of doubly selective wireless channels within pulse-shaping multicarrier systems (which include OFDM systems as a special case). A pilot-assisted channel estimation technique using the methodology of Compressed Sensing (CS) is proposed. By exploiting a channel's delay-Doppler sparsity, CS-based channel estimation allows an increase in spectral...

    Provided By University of Bonn

  • White Papers // Jul 2009

    A Classification Scheme for Update Propagation Methods in Deductive Databases

    Incremental view re-computation is a well-established research topic in deductive databases and plenty of update propagation methods have been proposed within the last two decades. All these approaches essentially apply the same propagation technique but differ in the way they are realized, the focus they provide to the induced changes...

    Provided By University of Bonn

  • White Papers // Jun 2009

    Detecting Moving Objects in Noisy Radar Data Using a Relational Database

    In moving object databases, many authors assume that number and position of objects to be processed are always known in advance. Detecting an unknown moving object and pursuing its movement, however, is usually left to tracking algorithms outside the database in which the sensor data needed is actually stored. In...

    Provided By University of Bonn

  • White Papers // Jun 2009

    SQL Triggers Reacting on Time Events: An Extension Proposal

    Being able to activate triggers at timepoints reached or after time intervals elapsed has been acknowledged by many authors as a valuable functionality of a DBMS. Recently, the interest in time-based triggers has been renewed in the context of data stream monitoring. However, up till now SQL triggers react to...

    Provided By University of Bonn

  • White Papers // Mar 2011

    Wormhole Detection Using Topology Graph Based Anomaly Detection

    Routing attacks are a serious threat to communication in tactical MANETs. TOGBAD is a centralised approach, using topology graphs to detect such attacks. In this paper, the authors present TOGBAD's newly added wormhole detection capability. It is an adaptation of a wormhole detection method developed by Hu et al. This...

    Provided By University of Bonn

  • White Papers // Feb 2010

    Success Factors of e-Collaboration in Business Process Modeling

    The authors identify the success factors of collaborative modeling of business processes by a qualitative analysis of the experiences of participants in group modeling sessions. The factors and their relations form a preliminary theoretical model of collaboration in modeling that extends existing models. The insights from this guided the improvement...

    Provided By University of Bonn

  • White Papers // Jun 2010

    Collaborative Business Process Modeling - Tool Support for Solving Typical Problems

    The paper studies typical problems that arise in collaborative modeling of business processes. The authors have used a design science approach to study collaborative modeling of business processes. Following this they have first designed a collaborative modeling architecture based on the empirical findings in a modeling study using conventional tools....

    Provided By University of Bonn