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Publicações

Publicações por José Manuel Oliveira

2010

Evaluating the Adaptation of Multimedia Services Using a Constraints-Based Approach

Autores
Oliveira, JM; Carrapatoso, EM;

Publicação
MOBILE MULTIMEDIA PROCESSING: FUNDAMENTALS, METHODS, AND APPLICATIONS

Abstract
This chapter presents a proposal to solve the problem of the adaptation of multimedia services in mobile contexts. The chapter combines context-awareness techniques with user interface modeling to dynamically adapt telecommunications services to user resources, in terms of terminal and network conditions. The solution is mainly characterized by the approach used for resolving the existing dependencies among user interface variables, which is based on the constraints theory. The experiments and tests carried out with these techniques demonstrate a general improvement of the adaptation of multimedia services in mobile environments, in comparison to systems that do not dynamically integrate the user context information in the adaptation process.

2007

Using context information for tailoring multimedia services to user's resources

Autores
Oliveira, JM; Carrapatoso, EM;

Publicação
REAL-TIME MOBILE MULTIMEDIA SERVICES, PROCEEDINGS

Abstract
The integration of multiple network access technologies in the terminal is one of the most important trends in 4G networks. This integration places telecommunications service providers, and in particular operators, under the significant challenge of being able to transform their services in order to adapt them to a great variety of delivery contexts. This paper describes a generic methodology for the adaptation of telecommunications services provided in the context of an operator. A number of scenarios are examined which show how Parlay middleware can be used by trusted service providers to easily access network resources and context information for enhancing location-based and adaptable multimedia telecommunications services.

2008

Dynamic generation of SMIL-based multimedia interfaces

Autores
Oliveira, JM; Carrapatoso, E;

Publicação
Journal of Multimedia

Abstract
The current heterogeneous world of networks and terminals combined with the generalized mobility of users pose telecommunications operators and service providers the challenge of dynamically adapt the services they provide. This paper presents a proposal to solve the problem of the adaptation of multimedia services in mobile contexts. The paper combines context-awareness techniques with user interface modeling and description to dynamically adapt telecommunications services to user resources, in terms of terminal and network conditions. The solution is mainly characterized by the approach used for resolving the existing dependencies among user interface variables, which is based on the constraints theory, and by the mechanism for acquiring the user context information, which uses the Parlay/OSA interfaces. The experiments and tests carried out with these techniques demonstrate a general Improvement of the adaptation of multimedia services in mobile environments, in comparison to systems that do not dynamically integrate the user context information in the adaptation process. © 2008 Academy Publisher.

2009

Unified communications: Different approaches for different types of enterprises

Autores
Almeida, F; Oliveira, J; Cruz, J;

Publicação
Proceedings of the IADIS International Conference Informatics 2009, Part of the IADIS Multi Conference on Computer Science and Information Systems, MCCSIS 2009

Abstract
Unified communications (UC) have the potential to dramatically simplify and improve enterprise communications, reducing costs and improving revenue opportunities. By integrating various forms of communications, such as voice, video, instant messaging, conferencing, presence and voicemail, individuals and groups can more effectively control and manage their inbound and outbound communications sessions. However, Large Enterprises (LE) and Small & Medium Enterprises (SMEs) have a diverse perspective look of UC and different needs. In this paper we will analyze the reasons that motivate the business leaders to introduce unified communications and we will study with detail the large enterprises and SMEs approach for the implementation of a unified communications solution. © 2009 IADIS.

2009

Mitigating the Security Risks of Unified Communications

Autores
Almeida, F; Cruz, J; Oliveira, J;

Publicação
PROCEEDINGS OF 2009 INTERNATIONAL CONFERENCE ON COMPUTER ENGINEERING AND APPLICATIONS

Abstract
Unified Communications (UC) have the potential to dramatically simplify and improve enterprise communications, reducing costs and improving revenue opportunities. However, these benefits do not come without risks. The introduction of an IP-based UC solution brings an array of new vulnerabilities into the enterprise, exploited by a growing number of malicious programs. This paper presents the most common of risks faced by the major dominant technologies used in unified communications solutions and an approach to mitigate them.

2002

Service provision & resource discovery in the VESPER VHE

Autores
Moura, JA; Oliveira, JM; Carrapatoso, E; Roque, R;

Publicação
2002 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-5, CONFERENCE PROCEEDINGS

Abstract
In VESPER1, the concept of VHE is being implemented and validated through the provision of a VHE system and various services to make use of it. This paper describes one of these services and presents how it validates VHE architecture aspects related with service adaptation to terminals and network, connection establishment, service personalization, session continuity/mobility and service advertisement. The paper also discusses some VHE usage scenarios of the resource discovery feature, showing how it plays an important role particularly in what concerns the ubiquitous service availability through the VHE platform.

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