P ER VA SI V E computingPublished by the IEEE CS n 1536-1268/08/$25.00 © 2008 IEEE s o f t w a r e a r c h i t e c t u r e toward a General software infrastructure for ubiquitous computing This general software architecture is designed to support ubiquitous computing's fundamental challenges, helping the community develop and assess middleware and frameworks for this area. Cristiano André da Costa Federal University of Rio Grande do Sul Adenauer Corrêa Yamin Catholic University of Pelotas Cláudio Fernando Resin Geyer Federal University of Rio Grande do SulT he most profound technologies are those that disappear. They weave themselves into the fabric of everyday life until they are indistinguishable from it." 1 Mark Weiser's visionary statement summarizes what's expected from pervasive or ubiquitous computing (ubicomp): user access to the computational environment, everywhere and at all times, by means of any device. The difficulty lies in how to develop applications that will continually adapt to the environment and remain working as people move or change devices. 2 The more traditional mobility goal of providing computation "all the time, everywhere" 3 is considered a reactive approach to information access. However, it represents a proactive step toward ubicomp. For this purpose, we need a new class of software, but the limited number of languages and tools available still hinders this field's development. 4 Ubiquitous applications need middleware to interface between many different devices and end-user applications. 3 The aim is to hide environment complexity by isolating applications from the explicit management of protocols, distributed memory access, data replication, communication faults, and so on. Middleware can also solve heterogeneity problems related to architectures, operating systems, network technologies, and even programming languages, promoting their interoperation. On the other hand, a framework is an environment, comprising APIs, user interfaces, and tools, that simplifies software development and management in a specific domain. We can use frameworks to develop middleware and to build software that runs on that middleware.Our proposed general architectural model for ubicomp supports frameworks and middleware while considering all the challenges we believe significant in the field. Here, we highlight the numerous requirements that are essential to the area and that software infrastructure should cover. ubiquitous computing challengesPrevious studies present issues that are unique or still open in ubicomp (see the "Related Work in Ubiquitous Computing" sidebar). Table 1 summarizes the main issues.Heterogeneity is a concern derived from distributed systems. Ubicomp software must hide infrastructure differences from users and manage the required conversions from one environment to another, addressing protocol mismatches. In this scenario, developers using a device-independent approach have to create application logic only once. Another related issue inherited from distributed systems is scalabili...

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With the growing number of mobile devices receiving daily notifications, it is necessary to manage the variety of information produced. New smart devices are developed every day with the ability to generate, send, and display messages about their status, data, and information about other devices. Consequently, the number of notifications received by a user is increasing and their tolerance may decrease in a short time. With this, it is necessary to develop a management system and notification controls. In this context, this work proposes a notification and alert management system called PRISER. Its focus is on user profiles and environments, applying data privacy criteria.

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Abstract:This paper presents a propose for support learning in a pervasive computing environment. It is composed of educational service agents (ESA) and a pervasive personal pedagogical agent (P3A). ESA will support educational applications using the pervasive environment ISAM. Agents will be accessed through P3A, which shall always be with the learner (the agent moves to devices that the learner is using -desktop, cellular phone, handhelds, etc), assisting the process of global learning through the identification and adaptation of the resources in agreement with the learner's educational model composed of the learner model, learner context and learning object model.

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