Study on distributed context-aware systems

制度:新 ; 文部省報告番号:甲2059号 ; 学位の種類:博士(情報科学) ; 授与年月日:2005/3/15 ; 早大学位記番号:新401

Interoperating Context Discovery Mechanisms

Context-Aware applications adapt their behaviour to the current situation of the user. This information, for instance user location and user availability, is called context information. Context is delivered by distributed context sources that need to be discovered before they can be used to retrieve context. Currently, multiple context discovery mechanisms exist, exhibiting heterogeneous capabilities (e.g. communication mechanisms, and data formats), which can be available to context-aware applications at arbitrary moments during the ap-plication’s lifespan. In this paper, we discuss a middleware mechanism that en-ables a (mobile) context-aware application to interoperate transparently with different context discovery mechanisms available at run-time. The goal of the proposed mechanism is to hide the heterogeneity and availability of context discovery mechanisms for context-aware applications, thereby facilitating their development

Integration of Heterogeneous Context Resources in Ubiquitous Environments

International audienceUbiquitous environments provide families of context-aware applications that are capable of exploiting the user mobility as well as the device variability. Typically, these applications retrieve context information from local and remote providers and react accordingly to the detected variations. However, this must be done by considering the heterogeneity of devices and protocols found in ubiquitous environments. Unfortunately, although the context integration represents a keystone of context-aware systems, existing approaches in the literature fail to integrate the diversity of context sources in a standard and flexible way. Therefore, in this paper, we overcome this challenge by introducing resource-oriented bindings into the SCA (Service Component Architecture) model. This new kind of bindings follows the REpresentational State Transfer (REST) principles and leverages the provision of context as RESTful resources. A smart home scenario that highlights challenges in terms of integration in ubiquitous environments motivates the use of our approach

Introducing Context-Awareness in Applications by Transforming High-Level Rules

International audienceIn the last years, we have witnessed the increase in the popu- larity and capabilities of mobile technologies. This evolution has enforced the idea of smart environments, in which devices are aware and able to react to changes in their environment. In this position paper we describe a specific approach for the development of context-aware software. We propose to make existing applications context-aware by means of three main components: context models, high-level rules and code-generation processors. We present each component and analyze the issues related to the development of context-aware software following this strategy

A survey of major challenges and future directions for next generation pervasive computing

Pervasive computing has emerged as a new computing paradigm with a great deal with appeal in our everyday environment. However, the benefits offered by this new computing paradigm are relatively below our expected standard. This paper discusses the major challenges for the next generation pervasive computing and the difficulties in developing a promising system to meet these challenges. Then, we present a survey that covers relevant existing approaches addressed to overcome the challenges. Finally, we highlight future research directions and present a new intriguing exploration, aiming to broaden the appeal and bridge the gap for the fulfillment of the challenges. © Springer-Verlag Berlin Heidelberg 2006