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UBIMOB Tables of Contents: 0405060809111213

Proceedings of the 2009 French-speaking conference on Mobility and ubiquity computing

Fullname:Proceedings of the 5th French-speaking conference on Mobility and ubiquity computing
Editors:David Menga; Florence Sèdes
Location:Lille, France
Dates:2009-Jul-07 to 2009-Jul-08
Standard No:ISBN 1-60558-622-6, 978-1-60558-622-9; ACM DL: Table of Contents hcibib: UBIMOB09
Links:Conference Home Page
  1. Confiance et déploiement de composants
  2. Interfaces multi-modales, contexte et objets mobiles
  3. Capteurs et événements
  4. Réplication et cache
  5. Démonstrations

Confiance et déploiement de composants

L'Elimination de la subjectivité dans la recommandation de confiance BIBAKFull-Text 3-10
  Omar Hasan; Lionel Brunie; Jean-Marc Pierson; Elisa Bertino
In ubiquitous environments, a party who wishes to make a transaction often requires that it has a certain level of trust in the other party. It is frequently the case that the parties are unknown to each other and thus share no preexisting trust. Trust-based systems enable users to establish trust in unknown users through trust recommendation from known users. For example, Bob may choose to trust an unknown user Carol when he receives a recommendation from his friend Alice that Carol's trustworthiness is 0.8 on the interval [0, 1].
   In this paper we highlight the problem that when a trust value is recommended by one user to another it may lose its real meaning due to subjectivity. Bob may regard 0.8 as a very high value of trust but it is possible that Alice perceived this same value as only average. We present a solution for the elimination of subjectivity from trust recommendation. We run experiments to compare our subjectivity-eliminated trust recommendation method with the unmodified method. In a random graph based web of trust with high subjectivity, it is observed that the novel method can give better results up to 95% of the time.
Keywords: social networks, subjectivity, trust, ubiquitous environments
CBay: encheres pour le redéploiement de composants sur l'internet des machines BIBAKFull-Text 11-18
  Charbel El Kaed; François Gael Ottogali; Yves Denneulin
Internet of machines also known as Machine-To-Machine is a system composed of thousands of interconnected machines that inter operate to run an application that meets a specific need. Such an application can be implemented by the encapsulation and the cooperation of several software entities called component. These components will be distributed on nodes with different resources in terms of memory, capacity of calculation, bandwidth, battery dependent, etc.
   The placement of these components on the nodes is a crucial step for both the application and the target machines. The choice of placement actually influences their performance. Such a deployment algorithm has to take into account the functional needs, constraints and properties as well as the available resources and performance of the whole system.
   Many algorithms have been proposed for this, including one based on a principle of auction, DecAp [13], which allows the dynamic redeployment of components in order to take into account the evolution of the system's resources. We present in this article an extension of this algorithm by adding the management of available resources on each node: memory, bandwidth and computing capacity.
Keywords: Machine-To-Machine, auction, deployment, software components

Interfaces multi-modales, contexte et objets mobiles

Record & replay: expérimentation d'un service multimodal BIBAKFull-Text 19-23
  Antoine Bouyer; Florent Chuffart
This paper presents the conception of a multimodal platform, and analyses the results of a user experimentation.
Keywords: multimodality, user experimentation
Vers la définition du contexte d'un utilisateur mobile de système de recherche d'information BIBAKFull-Text 25-31
  Ourdia Bouidghaghen; Lynda Tamine-Lechani; Mohand Boughanem
The mobile user differs from the desktop user in that his handheld device is truly personal. It roams with him and allows him access to information at any time from anywhere. Contextual information access in mobile environments aims to tackle the problem of information overload by providing appropriate results according to the resource constraints on the one hand and user's location, time and interests on the other hand. In this paper, we describe a general approach for building a context-aware user profile for a mobile user for search engines using evidence issued from retrieval situations. The basic idea is to learn the user's interests for each user's situation. A situation refers to an aggregation of the spatio-temporel context within his past search activities. User's interests are inferred from past search activities related to the identified situations.
Keywords: context-aware profile, contextuel information retrieval, location, mobile user, personalization, situation, time
Caractérisation de la densité de trafic et de son évolution à partir de trajectoires d'objets mobiles BIBAKFull-Text 33-40
  Ahmed Kharrat; Iulian Sandu Popa; Karine Zeitouni; Sami Faiz
Managing and mining data derived from moving objects is becoming an important issue in the last years. In this paper, we are interested in mining trajectories of moving objects such as vehicles in the road network. We propose a method for dense route discovery by clustering similar road sections according to both traffic and location in each time period. The traffic estimation is based on the collected spatiotemporal trajectories. We also propose a characterization approach of the temporal evolution of dense routes by a graph of route connection over consecutive time periods. This graph is labelled by a degree of evolution. We have implemented and tested the proposed algorithms, which have shown their effectiveness and efficiency.
Keywords: clustering, moving object databases, road traffic, similarity, spatiotemporal data mining

Capteurs et événements

Opérations d'administration pour SStreaMWare BIBAKFull-Text 41-44
  Levent Gürgen; Cyril Labbé; Shinichi Honiden
SStreaMWare is a data management middleware that allows building declarative queries on heterogeneous sensors. This paper illustrates how to extend SStreaMWare, in addition to its querying capabilities, with management capabilities, such as configuration, software update and performance monitoring, in order to increase the efficiency of networked sensing systems. In fact, with the emergence of sensors in applications in which the quality of service requirements are high (e.g., industrial, medical, domotic), management of these sensing devices gains an increasing importance.
Keywords: management, middleware, sensors, ubiquitous networks
Historical data storage for large scale sensor networks BIBAKFull-Text 45-52
  Loïc Petit; Abdelhamid Nafaa; Raja Jurdak
Wireless sensor networks are rapidly finding their way through a plethora of new applications like precision farming and forestry, with increasing network scale, system complexity, and data rate. While scalable MAC and routing protocols for sensor networks have been well addressed in recent years, the scalability of the back-end storage architecture has been largely overlooked. As a result, current storage and retrieval architectures usually lead to an excessive I/O cost when it comes to improving the scalability and responsiveness of the system. In this paper, we present a scalable backend storage and retrieval architecture to support very large volumes of real-time measurements from wireless sensor networks. In particular, our contribution provides: (i) a database partitioning and structuring scheme coupled with a double-buffering technique to reduce the end-to-end delay while minimizing the processing power, and (ii) an optimized historical measurement data query format tailored for superior performance in terms of data retrieval responsiveness. Through a realistic emulator for large scale sensor network, we evaluate this storage and retrieval system to illustrates its delay and I/O benefits in both high and low traffic rate scenarios. The evaluation guides our design of an adaptive design, that applies batch insert method for smaller deployments to reduce insertion delay, and double-buffering for larger deployments to reduce I/O cost and avoid saturation, at the cost of higher delay.
Keywords: database partitioning, double-buffer, historical storage, sensor
Résumé de flux d'événements dans les réseaux inter-véhiculaires BIBAKFull-Text 53-60
  Bruno Defude; Thierry Delot; Dorsaf Zekri
In this article, we focus en inter-vehicle ad hoc networks. In such networks, data are usually exchanged between vehicles to warn or inform the drivers when an event is detected (e.g., accident, emergency braking, available parking space, etc.).
   In this article, we propose de store and aggregate the data once used to produce a warning to the driver. We therefore use Flajolet-Martin sketches. Our goal is here to generate additional knowledge to assist drivers by detecting news road hazards (e.g., dangerous areas, etc.).
Keywords: V2V, data aggregation, event streams, inter-vehicles ad hoc networks, spatio-temporal data, storage and data aggregation

Réplication et cache

Support d'adaptation dynamique et distribuée dans la conception de systèmes de réplication de données BIBAKFull-Text 61-64
  Mohamed Zouari; Françoise André; Maria-Teresa Segarra
The distributed and mobile environments are characterized by high heterogeneity and suffer from important variations. Mobile and geographically dispersed users who collaborate together may access shared data. Data replication can be used to improve data availability and query latency. In order to ensure quality of service, a replication system should be adaptive to context. However, making such system adaptive can be a complex and costly task, in particular because of its distributed nature. This article presents our model-based approach to structure the mechanisms that ensure a dynamic and distributed adaptation. We propose a specialization of the model to build an adaptable data replication system. We have chosen to illustrate our approach through a telemedicine application.
Keywords: data replication, dynamic and distributed adaptation, telemedicine
Cache sémantique pour grilles pervasives BIBAKFull-Text 65-72
  Laurent d'Orazio; Mamadou Kaba Traoré
Pervasive grids present a new trend to distributed computing, for coordinating large-scale resources enabling access to small and smart devices. In this paper, we propose a caching approach for improving querying on pervasive grids. The proposed solution, called semantic pervasive dual cache, follows a semantic oriented approach. It is based on the one hand on a clear separation between the analysis and the evaluation process, and on the other hand on the cooperation between client caches considering light analysis and proxy caches including evaluation capabilities. Such an approach helps load balancing, making the system more scalable. Our proposal has been validated thanks to analytic models and simulations and seems promising as showed by the results obtained.
Keywords: pervasive grid, semantic caching


MANET: modèle de mobilité planifiée BIBAKFull-Text 75-78
  Frédéric Guinand; Brice Onfroy
With the common availability of mobile communicating devices like PDA or smartphones, mobile ad hoc networks (a.k.a MANET) are rising as an interesting domain of research. They are now ready for a wide development. These infrastructureless networks are composed of wireless-enable communicating devices, which moves entail frequent changes in their own neighborhood. Consequently, obtaining real data on this kind of networks in order to observe the dynamic of their topology is rather complicated. Thus, it is critical to be able to simulate human mobility in various environments for the purpose of recreating, in a global way, a dynamic network close to reality. Many mobility models have already been used for analyzing the viability of new protocols for routing, communicating or broadcasting. The purpose of this demonstration is present a simulation plateform for mobility models within urban environments. A new type of mobility model implementing the planification of moves will illustrate the way of using such simulator.
Keywords: MANET, dynamic graph, metropolitan mobile ad hoc network, mobile ad hoc network, mobility model, planned mobility, urban environment
Une architecture sensible au contexte pour le développement des systèmes d'administration pour l'enseignement BIBAKFull-Text 79-82
  Gaël Bergeret; Windson Viana; José Bringel Filho; José C. F. Junior; Marlène Villanova-Oliver; Jérôme Gensel; Hervé Martin
The increasing use of mobile devices and wireless communication technologies has improved the access to web information systems. However, the development of these systems imposes new challenges mainly due to the heterogeneity of mobile devices, the management of context information, and the complexity of adaptation process. Especially in this case, these systems should be runable on a great number of mobile devices models. In this article, we describe a context-aware architecture that provides solutions to the challenges presented above for the development of education administration systems.
Keywords: context-awareness, mobile computing, web applications
SimplyEngine-WComp: plate-forme de prototypage rapide pour l'Informatique ambiante basée sur une approche orientée services pour dispositifs réels/virtuels BIBAKFull-Text 83-86
  V. Maurin; N. Dalmasso; B. Copigneaux; S. Lavirotte; G. Rey; J.-Y. Tigli
In this paper, we describe the joint research between Simplysim company and the Rainbow research group to lead to SimplyEngine-WComp platform as a web service for device oriented platform to rapidly and dynamically prototype applications in a 3D virtual environment using physical devices to interact with. This experimental product is the result of the dual expertise of both organizations in the fields of 3D environment real time simulation and services for devices oriented approaches to design ubiquitous applications. The SLCA model and WComp middleware, made by the Rainbow research group are already validated by prototypes of multi-devices systems, complete the SimplyEngine made by Simplysim to propose a complete platform to prototype dynamic physical and virtual systems. All the conditions are met for prototyping incremental and scalable applications for ubiquitous world. Then the accuracy of the prototype depends on the number of virtual devices replaced by physical devices. This replacement is realized by a simple research, discovery and substitution of services.
Keywords: composite web services, input/output devices, ubiquitous computing, virtual and augmented reality
SoCQ: a pervasive environment management system BIBAKFull-Text 87-90
  Yann Gripay; Frédérique Laforest; Jean-Marc Petit
Pervasive systems give an overview of what digital environments should look like in the future. SoCQ takes a data-oriented perspective on the pervasive environment through a unified view of available data and services. Pervasive applications can then be created in a declarative fashion using service-oriented continuous queries. We tackle the following challenges: 1) a homogeneous representation for data sources and services from the pervasive environment, 2) a query language over pervasive environments, 3) a Pervasive Environment Management System (PEMS). This demonstration shows our PEMS prototype in action, allowing the user to visualize the environment and define pervasive applications.
Keywords: continuous queries, pervasive systems, services
SWooki: supporting disconnection in a peer-to-peer semantic wiki BIBAKFull-Text 91-94
  Hala Skaf-Molli; Pascal Molli; Gérôme Canals
SWooki is a P2P semantic wiki. A SWooki network is a set of interconnected semantic wiki servers. Each server hosts a replica of semantically annotated wiki pages. The replicated architecture allows to support mobile work. Mobile work is characterized by the alternate of connection and disconnection phases. During disconnection phase, the different replicas can be modified in parallel so they diverge. Later, upon reconnection they are synchronized. SWooki uses an optimistic replication mechanism to maintain the consistency of the replicated wiki pages and the replicated RDF repositories. This demonstration shows various functionalities of SWooki.
Keywords: disconnected work, peer-to-peer, replication, semantic wiki