Guillaume Auriol

Performance analysis for an IP Differentiated Services network

Research reported here deals with a communication architecture with guaranteed end-to-end quality of service (QoS) in an IPv6 environment providing differentiated services within a single DiffServ domain. The article successively presents the design principles and services of the proposed architecture, their implementation over a national platform, and experimental measurements evaluating the QoS provided at the user level.

A user-based approach for the choice of the IP services in the multi domains DiffServ Internet

This paper deals with the design of a distributed architecture and of mechanisms that are able to guarantee quality of service (QoS) in a set of DiffServ domains. The design includes the proposal of a signaling protocol to accept or reject the transmission of flows in a set of adequately controlled domains. More particularly, it provides a proposal for (1) selecting the end-to-end QoS paths resulting from concatenations of the IP services provided by the domains involved in the data path and (2) ensuring that the chosen concatenations fulfil the requested user QoS requirements. With respect to other work, this paper first tries to minimise the use of network resources by discovering the real performance of each domain. Second, the signaling protocol is designed to bring as less constraints as possible on the architecture. It defines the end-to-end concatenations only as a set of transfer bridges, or inter-domain links, and leaves all internal domain paths fully open to any implementation by the domain providers. The architecture, based on the use of bandwidth brokers, provides an answer to the two main problems related to such approaches, i.e. how to identify and build the sequence of the needed bandwidth brokers and how to select the ingress and egress routers of each of these domains to construct the end-to-end paths.

New real-time structural health monitoring microsystem for aircraft propeller blades

This presents work done on the project “Blade Parameters Recording Microsystem” funded by the French research program FUI. It resulted in a fully operational recorder that can be embedded on a plane. This system allows blade monitoring to be conducted using computing algorithms. Using a top-down modelling method, this recorder can be adapted to any kind of blade. Herein, recorder was devised for a Transall plane blade. This device was used to record data in order to subsequently compute a real-time blade monitoring algorithm. The algorithm takes several blade parameters into account. The top-down modelling easily allows the algorithm parameters to be adapted to various blades.

Automatic Management of the QoS within an Architecture Integrating New Transport and IP Services in a DiffServ Internet

Lots of research works have been performed for about ten years around the QoS problem in the Internet, both but separately at the Transport and at the IP levels. Taking into account the emerging traffic engineering-based QoS solutions (Diffserv-oriented), this paper targets the integration of new Transport services and protocols together with these solutions. Starting from performance measurements performed over a national DiffServ platform, contributions exposed here deal with the proposition and the implementation of a session level protocol allowing the application programmers to be masked with the complexity of choosing the underlying new Transport and IP services, still being provided with a per flow QoS.

System Engineering Method for System Design

The purpose of this chapter is to present some educational materials, the process and the outcomes to teach an engineering approach applied to a practical development case. The starting point is the requirements of an application of remote supervision of a room with several parameters: light, temperature and movement (intrusion into the room or movement of an object within the room). This application is based on wireless terminal nodes composed of a sensor, a microcontroller and a telecommunication module. Several rooms can be interconnected, so it must be possible to use the sensors of each room of a given site simultaneously. Various issues can be raised during teaching on wireless sensor networks (Kotzl & Essien, 2005): electronic design, risks to humans (Brownsell et al., 1999), energy management, telecommunication technologies, etc.

A prescriptive approach to understand customer needs using value-focused thinking

In the paper a prescriptive approach to understand customer needs is proposed, which helps to transform the subjective, human-centric problem into a more objective, decision-making problem. By recognizing the diversity of levels or granularities of initially identified customer statements, techniques of fundamental objectives hierarchy and means-ends objectives network are utilized to qualitatively structure the customer statements. A set of customer needs suitable for measuring is then identified. By carefully selecting an appropriate measure for each customer need in the set, quantitative value model for conjoint measurement is constructed with multiple attributes preference theory. The implications of quantitative understanding on customer needs in terms of values, e.g. weights and even swap, are further discussed. The business benefit of the approach is the breadth and depth of understanding of customer needs and values.

Lab work for the power-oriented design of a wireless sensor network

This paper describes a teaching experiment where students have to design a telecom system based on a wireless sensor network which specifications are power-oriented. Priority is given to an experimental hands-on approach.

Architecture de communication à gestion automatique de la QdS en environnement IP à services différenciés

Research reported here deals with the design and the deployment on a multimedia communication architecture providing end-to-end Quality of Service (QoS) guarantees in an IP environment providing differentiated services. The architecture of services is first exposed, particularly the one offered at the application (including QoS parameters and associated guarantee semantics). Then, protocols and mechanisms designed to manage automatically the QoS are exposed. Finally, an example illustrating the adaptation of a videoconference application on the proposed architecture is given. Future works taking into consideration the IP multi-domain interconnections are introduced in prospective part.