Stratification of the Information Space in Web Based Information Systems

Web-based Information Systems (WIS) are used for diffusing and processing information over the Internet. Because of the large amounts of information they manage, it is crucial to adapt the delivered information to users and to give them a progressive access to information. For this purpose, we propose to stratify the Information Space of a WIS by decomposing it into personalized sub- Information Spaces. Multimedia data can also be stratified into multiple formats used for their presentation. These stratifications are described through a Progressive Access Model (PAM) written in UML. In order to personalize the progressive access, the PAM is linked to both the data model of the application domain and to a Generic User Model describing the rights and preferences of users. We also show that, based on these stratifications, navigation mechanisms allow users to access first some minimum and essential information, and then larger and/or smaller personalized Information Spaces

Une formalisation du contexte dans les environnements coopératifs nomades

National audienceIn this paper, we propose an object oriented model for describing a mobile user's context inside a Web-based groupware system. These systems are confronted to the growing use of mobile devices, such as laptops, PDAs or cellular phones, which requires special context-aware capabilities. Our model formalizes the context notion, decoupling context and system information, which consequently reduces the system development complexity. We consider the context as a set of basic elements that identify the circumstances in which the user is accessing the system. These elements include elements related to physical aspects (the user's location and device), as well as those related to the cooperative process in which the user is involved (group, role, activities, etc.)

BW-M: A framework for awareness support in web-based groupware systems

In this paper, we present a framework for context-based awareness support designed for web-based groupware systems. Nowadays, such systems can be accessed through web-enabled mobile devices, such as PDAs and cellular phones, which allow their users to perform simple tasks, such as contacting colleagues or reading messages. However, these devices present some constraints related to their intrinsic characteristics (reduced display size, limited memory capacity...). These constraints make more acute the need for information filtering. We present a framework for awareness support which is able to adapt the awareness information to the user's context, in order to reduce the risk of information overload. This framework, called BW-M, selects among the available awareness information that which matches the user's, represented through pre-defined profiles, according her/his current context

A Personalized and Context-Aware Adaptation Process for Web-based Groupware Systems

International audienceThe evolution of mobile technologies, like web-enable cellphones, PDAs and wireless networks, makes it now possible to use these technologies for collaborative work through web-based groupware systems. However, due to the limitations of these technologies, some adaptation is essential in these systems. In order to adapt their behaviour to the user's context, groupware systems must be built as context-aware systems. Besides the characteristics of the user's context, we believe that the user's preferences should also be taken into account by the adaptation process. In this paper, we present a two-fold approach for adapting the informational content delivered to a mobile user by web-based groupware systems: we propose a filtering mechanism which considers both the current context and preferences for this context. The notion of context is represented through an object-based model we have proposed, which takes into account the user's physical context as well as the user's collaborative context, including elements dedicated to the collaborative process in which the user is involved (notions of group, role, activity, etc.). The user's preferences are represented by a set of pre-defined profiles, which are exploited by the adaptation process in order to organize the delivered information into several levels of detail, based on a progressive access model. The proposed filtering mechanism is performed in two steps: first, it analyses the user's current context and selects, among the user's pre-defined profiles, those which have been defined for a situation found in this context. Second, it uses the progressive access model in order to filter and organize the available information, according to the selected profiles

Context-Aware Filtering for Collaborative Web Systems: Adapting the Awareness Information to the Users Context

International audienceWe propose a context-based filtering process which aims at adapting the awareness information delivered to mobile users by collaborative web systems. This filtering process relies on a model of context which integrates both a physical and an organizational dimensions and allows to represent the user's current context as well as general profiles. These profiles are descriptions of user's potential contexts and express the awareness information filtering rules to apply when the user's current context matches one of them. These rules reflect the user's preferences given the context described. We describe how the filtering process performs in two steps, one for identifying the general profiles that apply, and a second for selecting the awareness information. We also discuss the patterns matching algorithms used in the filtering process to compare the contexts descriptions

A Context-Based Awareness Mechanism for Mobile Cooperative Users

This paper presents a context-based awareness mechanism designed for users who access web-based collaborative systems using mobile devices. The limited capabilities of such devices (reduced display size, limited battery and memory capacity...) constitute intrinsic constraints which make even more tenuous the issue of delivering relevant information to collaborative mobile users. We propose here an object-based representation of the notion of context and an awareness mechanism which filters the available information according to both the physical (user's location and device) and organizational (knowledge relative to the collaborative process) contexts of the user

Context-Aware Adaptation in Web-Based Groupware Systems

© Springer-Verlag London Limited 2010. In this chapter, we propose a context-aware filtering process for adapting content delivered to mobile users by Web-based Groupware Systems. This process is based on context-aware profiles, expressing mobile users preferences for particular situations they encounter when using these systems. These profiles, which are shared between members of a given community, are exploited by the adaptation process in order to select and organize the delivered information into several levels of detail, based on a progressive access model. By defining these profiles, we propose a filtering process that considers both the user’s current context and the user’s preferences for this context. The context notion of context is represented by an object-oriented model we propose and which takes into account consideration both the user’s physical and collaborative context, including elements related to collaborative activities performed inside the groupware system. The filtering process selects, in a first step, the context-aware profiles that match the user’s current context, and then it filters the available content according to the selected profiles and uses the progressive access model to organize the selected information.status: publishe