University of Toulouse

Displaying 1-24 of 24 results

  • White Papers // Apr 2012

    Online Multipath Convolutional Coding for Real-Time Transmission

    Most of multipath multimedia streaming proposals use Forward Error Correction (FEC) approach to protect from packet losses. However, FEC does not sustain well burst of losses even when packets from a given FEC block are spread over multiple paths. In this paper, the authors propose an online multipath convolutional coding...

    Provided By University of Toulouse

  • White Papers // Oct 2011

    An Enhanced Multiple Random Access Scheme for Satellite Communications

    In this paper, the authors introduce Multi-Slots Coded ALOHA (MuSCA) as a multiple random access method for satellite communications. This scheme can be considered as a generalization of the Contention Resolution Diversity Slotted Aloha (CRDSA) mechanism. Instead of transmitting replicas, this system replaces them by several parts of a single...

    Provided By University of Toulouse

  • White Papers // May 2011

    Small Size High Isolation Wilkinson Power Splitter for 60 GHz Wireless Sensor Network Applications

    This paper shows a very compact Wilkinson power splitter for high integrated millimeter wave systems. The approach, to reduce the component's size, is based on the lumped component transformation for the lines. The simulation on the splitter structure shows a very wide band with 0.5 dB of maximum insertion loss...

    Provided By University of Toulouse

  • White Papers // May 2011

    3D Heterogeneous Integration of Wireless Communicating Nano-Sensors on Flexible Substrate

    In this communication, the 3D heterogeneous integration of miniaturized communicating modules used for wireless network application is described. These communicating objects present the particularity of being in Nano-scale range. In fact, each object is composed of Nano-sensors, transceivers and E/R antenna. Such investigated ways of Nano-system integration will allow the...

    Provided By University of Toulouse

  • White Papers // Nov 2010

    Gas Release And Transport Capacity Investment As Instruments To Foster Competition In Gas Markets

    Motivated by recent policy events experienced by the European natural gas industry, this paper develops a simple model for analyzing the interaction between gas release and capacity investment programs as tools to improve the performance of imperfectly competitive markets. The authors consider a regional market in which a measure that...

    Provided By University of Toulouse

  • White Papers // Oct 2010

    Well-Formedness and Typing Rules for UML Composite Structures

    Starting from version 2.0, UML introduced hierarchical composite structures, which are an expressive way of defining complex software architectures, but which have a very loosely defined semantics in the standard. In this paper the authors propose a set of consistency rules that disambiguate the meaning of UML composite structures. The...

    Provided By University of Toulouse

  • White Papers // Sep 2010

    Going For Broke: New Century Financial Corporation, 2004-2006

    Using loan level data, the authors investigate the lending behavior of a large subprime mortgage issuer prior to its bankruptcy in the beginning of 2007. In 2004, this firm suddenly started to massively issue new loans contracts that featured deferred amortization ("Interest-only loans") to high income and high FICO households....

    Provided By University of Toulouse

  • White Papers // Jul 2010

    A Dynamic Duopoly Investment Game Under Uncertain Market Growth

    The authors model investments in capacity in a homogeneous product duopoly facing uncertain demand growth. Capacity building is achieved through adding production units that are durable and lumpy and whose cost is irreversible. There is no exogenous order of moves, no first-mover or second-mover advantage, no commitment, and no finite...

    Provided By University of Toulouse

  • White Papers // Apr 2010

    Performance Evaluation of Wireless Sensor Network for Spatial and Aeronautic Systems

    Ultra-WideBand (UWB) has been proposed for physical layer standard for high speed Wireless Personal Area Networks (WPAN). It has emerged as cost effective and reliable alternative to traditional wireless technologies in WPANs. This paper describes low complexity high data rate Ultra wideband system based on Wimedia communication protocol. It intends...

    Provided By University of Toulouse

  • White Papers // Apr 2010

    Cross-Layered Synchronization Protocol for Wireless Sensor Networks

    The aircraft industry has a conception cycle based on a massive use of Computer Assisted Design in order to allow more complex plane designs, and cheaper development costs compared to multiple prototyping steps. Among the many processes necessary to validate calculated aerodynamic models, real time pressure measurements are made on...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    Miniaturized Wireless Sensor Networks

    This paper addresses an overview of the wireless sensor networks. It is shown that MEMS/NEMS technologies and SIP concept are well suited for advanced architectures. It is also shown analog architectures have to be compatible with digital signal techniques to develop smart network of microsystem. It is now understood that...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    SOPC Co-Design Platform for UWB System in Wireless Sensor Network Context

    This paper presents the authors'approach of the radio interface problematic for Wireless Sensor Network. They introduce the WSN context and constraints associated. They propose an IR-UWB solution and illustrate why it could be a viable solution for WSN. A high level modeling and simulation platform for IR-UWB radio interface is...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    Software Defined Radio Layer for IR-UWB Systems in Wireless Sensor Network Context

    This paper addresses the radio interface problematic for MANET (Mobile Ad-hoc NETwork) applications. Here the authors propose to study the radio reconfigurability in order to provide a unique physical layer which is able to deal with all MANET applications. For implementing this reconfigurable physical layer, they propose to use Impulse...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    Simulation Platform for Wireless Sensor Networks Based on Impulse Radio Ultra Wide Band

    Impulse Radio Ultra Wide Band (IR-UWB) is a promising technology to address Wireless Sensor Network (WSN) constraints. However, existing network simulation tools do not provide a complete WSN simulation architecture, with the IR-UWB specificities at the PHYsical (PHY) and the Medium Access Control (MAC) layers. In this paper, the authors...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    Performance Evaluation of Impulse Radio Ultra Wide Band Wireless Sensor Networks

    This paper presents a performance evaluation of Wireless Sensor Networks (WSN) based on Impulse Radio Ultra WideBand (IR-UWB) over a new simulation platform developed for this purpose. The simulation platform is built on an existing network simulator: Global Mobile Information System Simulator (GloMoSim). It mainly focuses on the accurately modeling...

    Provided By University of Toulouse

  • White Papers // Nov 2009

    How To Adapt To Changing Markets: Experience And Personality In A Repeated Investment Game

    Investment behavior is traditionally investigated with the assumption that it is on average advantageous to invest. However, this may not always be the case. In this paper, the authors experimentally studied investment choices made by students and financial professionals facing alternately an advantageous and disadvantageous environment in a multi-round investment...

    Provided By University of Toulouse

  • White Papers // Sep 2009

    Previous Outcomes And Reference Dependence: A Meta Study Of Repeated Investment Tasks With And Without Restricted Feedback

    When investment is repeated, previous outcomes (winning/losing) as well as the current budget level (gain/loss domain) influence decisions. The first is related to the so-called "Gamblers fallacy". The second to value function relative to some reference point. Both effects have been extensively studied, however not their interaction. The authors present...

    Provided By University of Toulouse

  • White Papers // Sep 2009

    System Architecture Modeling of an UWB Receiver for Wireless Sensor Network

    This paper presents a method for system architecture modeling of an IR-UWB (Impulse Radio Ultra WideBand) receiver for sensors networks applications. The authors expose the way for designing an FPGA (Field Programmable Gate Array) receiver starting from a previous study based on system modeling on Matlab. The proposed receiver architecture...

    Provided By University of Toulouse

  • White Papers // May 2009

    A Language-Theoretic View on Guidelines and Consistency Rules of UML

    Guidelines and consistency rules of UML are used to control the degrees of freedom provided by the language to prevent faults. Guidelines are used in specific domains (e.g., avionics) to recommend the proper use of technologies. Consistency rules are used to deal with inconsistencies in models. However, guidelines and consistency...

    Provided By University of Toulouse

  • White Papers // May 2009

    Modeling System Safety Requirements Using Input/Output Constraint Meta-Automata

    Most recent software related accidents have been system accidents. To validate the absence of system hazards concerning dysfunctional interactions, industrials call for approaches of modeling system safety requirements and interaction constraints among components and with environments (e.g., between humans and machines). This paper proposes a framework based on input/output constraint...

    Provided By University of Toulouse

  • White Papers // May 2009

    Formalizing Safety Requirements Using Controlling Automata

    Safety is an important element of dependability. It is defined as the absence of accidents. Most accidents involving software-intensive systems have been system accidents, which are caused by unsafe inter-system or inter-component interactions. To validate the absence of system hazards concerning dysfunctional interactions, industrials call for approaches of modeling system...

    Provided By University of Toulouse

  • White Papers // Jan 2009

    A Reconfigurable IR-UWB Radio Interface, With Directional Antennas and Localization Capability, for Wireless Sensor Networks

    This paper proposes an IR-UWB radio interface layer which is able to deal with WSN context. With this intention, the authors present a reconfigurable IR-UWB with directional antennas and localization capability at 60 GHz. They introduce the advantages of using the millimeter band, directional antennas, localization and the reconfigurability. They...

    Provided By University of Toulouse

  • White Papers // Jan 2009

    On Designing Sensor Networks With Smart Antennas

    Wireless Sensor Networks (WSN) is an active research area. The recent advances in the fields of antennae and transmission let's consider massive improvements in the energy and communication management of WSN. However, the new WSN architectures have to evolve to take it into account. This paper presents an extension of...

    Provided By University of Toulouse

  • White Papers // Dec 2008

    Optimization of WiMax Modulation Scheme With a Cross Layer Erasure Code

    WIMAX (Worldwide Interoperability for Microwave Access) is a promising new networking technology that potentially offers high speed and wide area wireless access services that complement consistently the 3G and WiFi access networks capabilities. The standard proposes an adaptive modulation scheme which allows WiMax nodes to communicate from various modulation coding...

    Provided By University of Toulouse

  • White Papers // Oct 2010

    Well-Formedness and Typing Rules for UML Composite Structures

    Starting from version 2.0, UML introduced hierarchical composite structures, which are an expressive way of defining complex software architectures, but which have a very loosely defined semantics in the standard. In this paper the authors propose a set of consistency rules that disambiguate the meaning of UML composite structures. The...

    Provided By University of Toulouse

  • White Papers // May 2009

    A Language-Theoretic View on Guidelines and Consistency Rules of UML

    Guidelines and consistency rules of UML are used to control the degrees of freedom provided by the language to prevent faults. Guidelines are used in specific domains (e.g., avionics) to recommend the proper use of technologies. Consistency rules are used to deal with inconsistencies in models. However, guidelines and consistency...

    Provided By University of Toulouse

  • White Papers // May 2009

    Modeling System Safety Requirements Using Input/Output Constraint Meta-Automata

    Most recent software related accidents have been system accidents. To validate the absence of system hazards concerning dysfunctional interactions, industrials call for approaches of modeling system safety requirements and interaction constraints among components and with environments (e.g., between humans and machines). This paper proposes a framework based on input/output constraint...

    Provided By University of Toulouse

  • White Papers // May 2009

    Formalizing Safety Requirements Using Controlling Automata

    Safety is an important element of dependability. It is defined as the absence of accidents. Most accidents involving software-intensive systems have been system accidents, which are caused by unsafe inter-system or inter-component interactions. To validate the absence of system hazards concerning dysfunctional interactions, industrials call for approaches of modeling system...

    Provided By University of Toulouse

  • White Papers // Dec 2008

    Optimization of WiMax Modulation Scheme With a Cross Layer Erasure Code

    WIMAX (Worldwide Interoperability for Microwave Access) is a promising new networking technology that potentially offers high speed and wide area wireless access services that complement consistently the 3G and WiFi access networks capabilities. The standard proposes an adaptive modulation scheme which allows WiMax nodes to communicate from various modulation coding...

    Provided By University of Toulouse

  • White Papers // Sep 2009

    System Architecture Modeling of an UWB Receiver for Wireless Sensor Network

    This paper presents a method for system architecture modeling of an IR-UWB (Impulse Radio Ultra WideBand) receiver for sensors networks applications. The authors expose the way for designing an FPGA (Field Programmable Gate Array) receiver starting from a previous study based on system modeling on Matlab. The proposed receiver architecture...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    SOPC Co-Design Platform for UWB System in Wireless Sensor Network Context

    This paper presents the authors'approach of the radio interface problematic for Wireless Sensor Network. They introduce the WSN context and constraints associated. They propose an IR-UWB solution and illustrate why it could be a viable solution for WSN. A high level modeling and simulation platform for IR-UWB radio interface is...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    Software Defined Radio Layer for IR-UWB Systems in Wireless Sensor Network Context

    This paper addresses the radio interface problematic for MANET (Mobile Ad-hoc NETwork) applications. Here the authors propose to study the radio reconfigurability in order to provide a unique physical layer which is able to deal with all MANET applications. For implementing this reconfigurable physical layer, they propose to use Impulse...

    Provided By University of Toulouse

  • White Papers // May 2011

    Small Size High Isolation Wilkinson Power Splitter for 60 GHz Wireless Sensor Network Applications

    This paper shows a very compact Wilkinson power splitter for high integrated millimeter wave systems. The approach, to reduce the component's size, is based on the lumped component transformation for the lines. The simulation on the splitter structure shows a very wide band with 0.5 dB of maximum insertion loss...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    Simulation Platform for Wireless Sensor Networks Based on Impulse Radio Ultra Wide Band

    Impulse Radio Ultra Wide Band (IR-UWB) is a promising technology to address Wireless Sensor Network (WSN) constraints. However, existing network simulation tools do not provide a complete WSN simulation architecture, with the IR-UWB specificities at the PHYsical (PHY) and the Medium Access Control (MAC) layers. In this paper, the authors...

    Provided By University of Toulouse

  • White Papers // Sep 2010

    Going For Broke: New Century Financial Corporation, 2004-2006

    Using loan level data, the authors investigate the lending behavior of a large subprime mortgage issuer prior to its bankruptcy in the beginning of 2007. In 2004, this firm suddenly started to massively issue new loans contracts that featured deferred amortization ("Interest-only loans") to high income and high FICO households....

    Provided By University of Toulouse

  • White Papers // Jul 2010

    A Dynamic Duopoly Investment Game Under Uncertain Market Growth

    The authors model investments in capacity in a homogeneous product duopoly facing uncertain demand growth. Capacity building is achieved through adding production units that are durable and lumpy and whose cost is irreversible. There is no exogenous order of moves, no first-mover or second-mover advantage, no commitment, and no finite...

    Provided By University of Toulouse

  • White Papers // Nov 2010

    Gas Release And Transport Capacity Investment As Instruments To Foster Competition In Gas Markets

    Motivated by recent policy events experienced by the European natural gas industry, this paper develops a simple model for analyzing the interaction between gas release and capacity investment programs as tools to improve the performance of imperfectly competitive markets. The authors consider a regional market in which a measure that...

    Provided By University of Toulouse

  • White Papers // Nov 2009

    How To Adapt To Changing Markets: Experience And Personality In A Repeated Investment Game

    Investment behavior is traditionally investigated with the assumption that it is on average advantageous to invest. However, this may not always be the case. In this paper, the authors experimentally studied investment choices made by students and financial professionals facing alternately an advantageous and disadvantageous environment in a multi-round investment...

    Provided By University of Toulouse

  • White Papers // Sep 2009

    Previous Outcomes And Reference Dependence: A Meta Study Of Repeated Investment Tasks With And Without Restricted Feedback

    When investment is repeated, previous outcomes (winning/losing) as well as the current budget level (gain/loss domain) influence decisions. The first is related to the so-called "Gamblers fallacy". The second to value function relative to some reference point. Both effects have been extensively studied, however not their interaction. The authors present...

    Provided By University of Toulouse

  • White Papers // Apr 2010

    Performance Evaluation of Wireless Sensor Network for Spatial and Aeronautic Systems

    Ultra-WideBand (UWB) has been proposed for physical layer standard for high speed Wireless Personal Area Networks (WPAN). It has emerged as cost effective and reliable alternative to traditional wireless technologies in WPANs. This paper describes low complexity high data rate Ultra wideband system based on Wimedia communication protocol. It intends...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    Performance Evaluation of Impulse Radio Ultra Wide Band Wireless Sensor Networks

    This paper presents a performance evaluation of Wireless Sensor Networks (WSN) based on Impulse Radio Ultra WideBand (IR-UWB) over a new simulation platform developed for this purpose. The simulation platform is built on an existing network simulator: Global Mobile Information System Simulator (GloMoSim). It mainly focuses on the accurately modeling...

    Provided By University of Toulouse

  • White Papers // Feb 2010

    Miniaturized Wireless Sensor Networks

    This paper addresses an overview of the wireless sensor networks. It is shown that MEMS/NEMS technologies and SIP concept are well suited for advanced architectures. It is also shown analog architectures have to be compatible with digital signal techniques to develop smart network of microsystem. It is now understood that...

    Provided By University of Toulouse

  • White Papers // Apr 2010

    Cross-Layered Synchronization Protocol for Wireless Sensor Networks

    The aircraft industry has a conception cycle based on a massive use of Computer Assisted Design in order to allow more complex plane designs, and cheaper development costs compared to multiple prototyping steps. Among the many processes necessary to validate calculated aerodynamic models, real time pressure measurements are made on...

    Provided By University of Toulouse

  • White Papers // Jan 2009

    A Reconfigurable IR-UWB Radio Interface, With Directional Antennas and Localization Capability, for Wireless Sensor Networks

    This paper proposes an IR-UWB radio interface layer which is able to deal with WSN context. With this intention, the authors present a reconfigurable IR-UWB with directional antennas and localization capability at 60 GHz. They introduce the advantages of using the millimeter band, directional antennas, localization and the reconfigurability. They...

    Provided By University of Toulouse

  • White Papers // May 2011

    3D Heterogeneous Integration of Wireless Communicating Nano-Sensors on Flexible Substrate

    In this communication, the 3D heterogeneous integration of miniaturized communicating modules used for wireless network application is described. These communicating objects present the particularity of being in Nano-scale range. In fact, each object is composed of Nano-sensors, transceivers and E/R antenna. Such investigated ways of Nano-system integration will allow the...

    Provided By University of Toulouse

  • White Papers // Jan 2009

    On Designing Sensor Networks With Smart Antennas

    Wireless Sensor Networks (WSN) is an active research area. The recent advances in the fields of antennae and transmission let's consider massive improvements in the energy and communication management of WSN. However, the new WSN architectures have to evolve to take it into account. This paper presents an extension of...

    Provided By University of Toulouse

  • White Papers // Oct 2011

    An Enhanced Multiple Random Access Scheme for Satellite Communications

    In this paper, the authors introduce Multi-Slots Coded ALOHA (MuSCA) as a multiple random access method for satellite communications. This scheme can be considered as a generalization of the Contention Resolution Diversity Slotted Aloha (CRDSA) mechanism. Instead of transmitting replicas, this system replaces them by several parts of a single...

    Provided By University of Toulouse

  • White Papers // Apr 2012

    Online Multipath Convolutional Coding for Real-Time Transmission

    Most of multipath multimedia streaming proposals use Forward Error Correction (FEC) approach to protect from packet losses. However, FEC does not sustain well burst of losses even when packets from a given FEC block are spread over multiple paths. In this paper, the authors propose an online multipath convolutional coding...

    Provided By University of Toulouse