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Auflistung nach Autor:in "Hunel, Philippe"

1 - 4 von 4
  • Konferenzbeitrag
    A distributed cache management for test derivation
    (10th International Conferenceon Innovative Internet Community Systems (I2CS) – Jubilee Edition 2010 –, 2010) Gros-Desormeaux, Harry; Fouchal, Hacène; Hunel, Philippe
    Complex systems need to be validated before industrial development. The last step in the validation process is testing. This part has to be considered with care in order to avoid troubles. This step takes a long time and requires a lot of resources. In this paper, a complex system is described a Timed Labeled Transition System (TLTS). In such description, we focus on the specification of the event ordering respecting time constraints. Since the TLTS may be very large (million of states for industrial systems), we present a solution to reduce the test derivation complexity. We aim to decompose the derivation process among some hosts participating to the generation algorithm. Each host will deal with a part of the system independently ; each host will derive test sequences for some fixed states from the system. Some computations are redundant. In order to reduce them, on each host we use the Bloom filters concept used to manage a local cache containing computed sequences. Then, we show how to compute the results given by all hosts in order give a set of test sequences for the whole system. We suggest an implementation of this technique on the JXTA environment deployed on some hosts. We analyze a large number of experiments on different TLTS. Finally, we have shown that the use of Bloom filters make increases the test derivation performances.
  • Konferenzbeitrag
    Impact of application layer over wireless sensor networks
    (12th International Conference on Innovative Internet Community Services (I2CS 2012), 2012) Ramassamy, Cédric; Fouchal, Hacène; Hunel, Philippe
    Applications over Wireless Sensor Networks (WSNs) are various and different. Many routing protocols have been proposed for WSNs since a many years. Medium Access Control (MAC) protocols can differ from a network to another. The transmission range can also be variable from a sensor to another depending on their battery capacities. All these various protocols have an influence on the WSNs. It is worthy to choose the appropriate protocol for each specific situation in order to ensure high security of the network. In this paper, we show that the type of applications has a real impact on WSN. In- deed, each kind of application with a specific routing protocol, MAC layer and transmission range value impact on security of network in terms of packets lost rate. We have undertaken a set of experimentations in order to show the importance of an appropriate configuration to deploy a WSN with a high security confidence degree. For the application layer, we have handled three types of applications. For the routing layer, we have handled only with AOMDV protocol. For MAC layer we use 802.15.4 protocols. We have conducted many simulations through the NS-2 simulator in order to analyze one relevant security indicators on WSNs: lost packet rate.
  • Konferenzbeitrag
    On using a distributed approach for help in medical diagnosis with wireless sensor networks
    (11th International Conference on Innovative Internet Community Systems (I2CS 2011), 2011) Dessart, Nathalie; Fouchal, Hacène; Hunel, Philippe; Vidot, Nicolas
    In this paper, we focus on providing new tools to help doctors in their diagnosis. We study the feasibility of using a distributed approach over Wireless Sensor Networks (WSN). We define a Wireless Body Area Network (WBAN) as a set of wireless sensors which equipped a patient. Each sensor senses a health parameter, for example, temperature or heart pulse. Our aim is to understand how a distributed approach can be a fair alternative to the common centralized paradigm. We study a distributed approach based on the token paradigm. Then, we compare this approach to the centralized one, throw simulations and experimentations over real sensors.
  • Konferenzbeitrag
    Optimizing Distributed Test Generation
    (10th International Conferenceon Innovative Internet Community Systems (I2CS) – Jubilee Edition 2010 –, 2010) Gros-Désormeaux, Harry; Fouchal, Hacène; Hunel, Philippe
    This paper presents two optimizations of the master-slave paradigm which provides more robustness. The former uses a mobile master which randomly jumps from node to node in order to dispatch the bandwidth load during the application execution. The latter aims to fully decentralize the paradigm like peer-to-peer systems. We present and experiment our new schemes on an application dedicated to test generation used in protocol engineering. We show that they can help for unknown dynamic environments where no information is given about nodes configuration.