Computer Science And Engineering

An Eco-inspired Evolutionary Algorithm Applied to Numerical Optimization

by Rafael Stubs Parpinelli

CORBA, DCOM E JAVARMI - Uma Análise Comparativa

by Vitor Roque

ROQUE, Vitor Manuel Gomes ;  OLIVEIRA, José Luís  - CORBA, DCOM E JAVARMI - UMA ANÁLISE COMPARATIVA . Ingenium . , vol. , n.º 46  (Mar. 2000) . p. 87-91. Portuguese text.

Transactional Integrity Issues in Policy Based Network Management Systems

by Vitor Roque

Roque,V., Lopes, R., Oliveira, JL.
Transactional Integrity Issues in Policy Based Network Management Systems
Egitânia Sciencia nº2
Vol. II
Pag. 167-181
IPG
ISBN: 1646-8848
Depósito Legal: 260795/07
http://www.ipg.pt/revistaipg/files/Egitania%20Sciencia_Vol2.pdf | http://www.ipg.pt/revistaipg

As networks increase in size, heterogeneity, complexity and pervasiveness, effective management of such networks... more As networks increase in size, heterogeneity, complexity and pervasiveness, effective management of such networks becomes more important and increasingly difficult. In this context, PBNM (Policy-Based Network Management) has been gaining popularity in the recent years. New demands on internetworking, services specification, QoS and generically on network management functionality have been driving users to consider this paradigm in their own networks.
As people start exploiting PBNM, another aspect comes to attention: transactional integrity. Transactional control envisages achieving consistent state changes along the network. In other words, state transition in network devices is only authorized if all the related operations are successfully taken. 
In this paper we propose a transactional control mechanism for PBNM systems, namely its assurance across different systems and different network domains.

Utilização de Políticas em Gestão de Redes e Sistemas de Informação

by Vitor Roque

Roque, V., Lopes, R.P., Oliveira, J.L.
Utilização de Políticas em Gestão de Redes e Sistemas de Informação
Egitânia Sciencia nº1
Vol. I
Pag. 175-188
IPG
ISBN:1646-8848
Depósito Legal: 260795/07
http://www.ipg.pt/revistaipg/files/Egitania%20Sciencia_Vol1.pdf  | http://www.ipg.pt/revistaipg

A gestão das redes tornou-se, nos últimos anos, um tema de máxima importância para as empresas dado que a sua... more A gestão das redes tornou-se, nos últimos anos, um tema de máxima importância para as empresas dado que a sua organização, os fluxos de informação e métodos de trabalho, quer interna quer externamente, estão cada vez mais dependente do bom funcionamento de redes de comunicação. Esta dependência faz com que a disponibilidade e desempenho destas infra-estruturas e serviços sejam actualmente factores determinantes para o seu sucesso.
Tem-se assistido também a um aumento quer a nível de tamanho, quer a nível de complexidade das redes, o que implica o desenvolvimento rápido de mecanismos de configuração normalizados para que a sua gestão seja feita de uma forma eficaz e rápida.
O conceito de gestão por políticas surgiu nos últimos anos como o paradigma “ideal” para tratar este tipo de necessidades.
Tendo em consideração que a maioria dos actuais sistemas de informação tem uma interdependência quase total com a rede de comunicação que lhe dá suporte, é importante que esta mesma rede esteja a funcionar correctamente, isto é exiba os comportamentos adequados, pois uma sua eventual falha pode levar, em casos extremos, à inoperabilidade total ou parcial do próprio sistema de informação.
A Gestão Baseada em Políticas (PBM – Policy Based Management) apresenta-se como um paradigma adequado quer para gerir estas novas redes de comunicação quer para garantir segurança e, genericamente, definir as politicas de utilização dos sistemas e infra-estrutura de comunicações de uma organização. Este artigo visa expor esta metodologia, o estado de normas e de desenvolvimentos, e discutir a sua utilização nos sistemas de informação actuais de forma a garantir uma administração coordenada e consistente.

Using CIM Extensions to model Managed Entities in Heterogeneous Networks

by Vitor Roque

proc. of the IEEE International Workshop on Management Issues and Challenges in Mobile Computing - MICMC 2005, Nice, France, 15 May 2005.

This paper is devoted to the definition of management information which models specific functionality of the entities... more This paper is devoted to the definition of management information which models specific functionality of the entities that build Daidalos European Project. This management information will be used in policy–based management system (PBNMS) to manage QoS aspects of the network functionality.

Utilização de Políticas em Gestão de Redes e Sistemas de Informação

by Vitor Roque

actas da V Conferência da APSI – CAPSI2004, Lisboa, Portugal, 3-5 Novembro de 2004

A gestão das redes tornou-se, nos últimos anos, um tema de máxima importância para as empresas dado que a sua... more A gestão das redes tornou-se, nos últimos anos, um tema de máxima importância para as empresas dado que a sua organização, os fluxos de informação e métodos de trabalho, quer interna quer externamente, estão cada vez mais dependente do bom funcionamento de redes de comunicação. Esta dependência faz com que a disponibilidade e desempenho destas infra-estruturas e serviços sejam actualmente factores determinantes para o seu sucesso.
Tem-se assistido também a um aumento quer a nível de tamanho, quer a nível de complexidade das redes, o que implica o desenvolvimento rápido de mecanismos de configuração normalizados para que a sua gestão seja feita de uma forma eficaz e rápida.
O conceito de gestão por políticas surgiu nos últimos anos como o paradigma “ideal” para tratar este tipo de necessidades.
Tendo em consideração que a maioria dos actuais sistemas de informação tem uma interdependência quase total com a rede de comunicação que lhe dá suporte, é importante que esta mesma rede esteja a funcionar correctamente, isto é exiba os comportamentos adequados, pois uma sua eventual falha pode levar, em casos extremos, à inoperabilidade total ou parcial do próprio sistema de informação.
A Gestão Baseada em Políticas (PBM – Policy Based Management) apresenta-se como um paradigma adequado quer para gerir estas novas redes de comunicação quer para garantir segurança e, genericamente, definir as politicas de utilização dos sistemas e infra-estrutura de comunicações de uma organização. Este artigo visa expor esta metodologia, o estado de normas e de desenvolvimentos, e discutir a sua utilização nos sistemas de informação actuais de forma a garantir uma administração coordenada e consistente.

Towards Transactional Integrity Issues in Policy Based Network Management Systems

by Vitor Roque

actas da 7ª Conferência de Redes de Computadores – CRC2004, Leiria, Portugal, 7-8 Outubro de 2004

As networks increase in size, heterogeneity, complexity and pervasiveness, effective management of such networks... more As networks increase in size, heterogeneity, complexity and pervasiveness, effective management of such networks becomes more important and increasingly difficult. In this context, PBNM (Policy-Based Network Management) has been gaining popularity in the recent years. New demands on internetworking, services specification, QoS and generically on network management functionality have been driving users to consider this paradigm in their own networks.
As people start exploiting PBNM, another aspect comes to attention: transactional integrity. Transactional control envisages achieving consistent state changes along the network. In other words, state transition in network devices is only authorized if all the related operations are successfully taken.
In this paper we propose a transactional control mechanism for PBNM systems, namely its assurance across different systems and different network domains.

Visual Composition of Management Policies

by Vitor Roque

proc. of the 4th Conference on Telecommunications – ConfTele2003, Aveiro, Portugal, 18-20 June 2003.

Policy based management have gained a crescent importance in the last years. New demands on internetworking, on... more Policy based management have gained a crescent importance in the last years. New demands on internetworking, on services specification, on QoS achievement and generically on network management functionality, have driven this paradigm to a very important level. The main idea is to provide services that allow specifying management and operational rules in the same way people do business. Despite the main association of this technology with network management solutions, its generality allows to extend these principles to any business process inside an organization. In this paper we discuss the main proposals in the field, namely the IETF/DMTF model, and we present a proposal that allows the specification of policy rules through a user-friendly and component-oriented graphical interface.

Policy-Based Network Management in an Integrated Mobile Network

by Vitor Roque

Through the seamless integration of different kinds of technologies, services and terminals, and with the expected... more Through the seamless integration of different kinds of technologies, services and terminals, and with the expected offered bandwidth, the next generation networks will put a new set of challenges related to operation and management. In this paper we present a Policy-based Network Management System that is being developed inside the Daidalos IST project.

Executable Graphics for PBNM

by Vitor Roque

http://www.springer.com/computer/communication+networks/book/978-3-540-29356-9

Policy-Based Network Management (PBNM) is the
application of specific, organisation-level rules in the context... more Policy-Based Network Management (PBNM) is the
application of specific, organisation-level rules in the context of
networking, in particular for network management operations.
The specification of a policy is performed in a policy language,
usually following a textual representation. However, humans
process images faster than text and they are prepared to process
information presented in two or more dimensions: sometimes it is
easier to explain things using figures and their graphical relations
than writing textual representations.
This paper describes a visual language, in the form of graphics
that are executed in a networking environment, to define a
network management policy. This approach allows to map visual
tokens and corresponding arrangements into other languages to
which a mapping is defined.

Design and Optimization Method for Inertial Particle Separator Systems

by Eyas Alfaris

Solving Transactional Control in Current Management Frameworks

by Vitor Roque

proc. of the 6th International Conference on Enterprise Information Systems - ICEIS2004, Porto, Portugal, 14-17 April 2004.

Policy Based Network Management has been presented as a paradigm for efficient and customisable management systems.... more Policy Based Network Management has been presented as a paradigm for efficient and customisable management systems. The IETF has provided a framework to describe the concept but some aspects still open like transactional control. In fact transactional control mechanisms are receiving today great attention in the scope of network management. In here, we identify the lacks of current management paradigms concerning transactional control and we propose a policy-based network management system that allows specify operations over aggregations of agents and that provides high-level atomic transactions.

Policies Composition Through Graphical Components

by Vitor Roque

proc. of the 5th International Conference on Enterprise Information Systems - ICEIS2003, Angers, France, 23-26 April 2003.

Policy based management have gained a crescent importance in the two last years. New demands on
internetworking,... more Policy based management have gained a crescent importance in the two last years. New demands on
internetworking, on services specification, on QoS achievement and generically on network management
functionality, have driven this paradigm to a very important level. The main idea is to provide services that
allow specifying management and operational rules in the same way people do business. Despite the main
focus of this technology has been associated with network management solutions, its generality allows to
extend these principles to any business process inside an organization. In this paper we discuss the main
proposals in the field, namely the IETF/DMTF model, and we present a proposal that allows the
specification of policy rules through a user-friendly and component-oriented graphical interface.

Digital Annotation of Printed Documents

by Beat Signer

Corsin Decurtins, Moira C. Norrie and Beat Signer, Proceedings of CIKM 2003, 12th International Conference on Information and Knowledge Management. New Orleans, USA, November 2003

We present a general model and information server for the digital annotation of printed documents. The resulting... more We present a general model and information server for the digital annotation of printed documents. The resulting annotation framework supports both informal and structured annotations as well as context-dependent services. A demonstrator application for mammography that features both enhanced writing and reading activities is described.

Switching over to Paper: A New Web Channel

by Beat Signer

Moira C. Norrie and Beat Signer, Proceedings of WISE 2003, 4th International Conference on Web Information Systems Engineering. Rome, Italy, December 2003

We present a general web-based information infrastructure capable of supporting the rapid development of... more We present a general web-based information infrastructure capable of supporting the rapid development of highlyinteractive information environments that cater for widely varying requirements across application domains and all forms of fixed and mobile client devices. In particular, we describe how this infrastructure has been extended to support digitally augmented paper through a special transformation component that can map active areas of document pages to information objects so that user- and contextdependent interaction can be supported. Our infrastructure is sufficiently general and flexible to adapt to, not only emerging and even unanticipated technologies in the area of interactive paper, but also the rapidly expanding interaction sphere of hypermedia.

Putting the Gloss on Paper: A Framework for Cross-Media Annotation

by Beat Signer

Corsin Decurtins, Moira C. Norrie and Beat Signer, NRHM 2003, New Review of Hypermedia and Multimedia. Volume 9, 2003

We present a general framework for cross-media annotation that can be used to support the many different forms and... more We present a general framework for cross-media annotation that can be used to support the many different forms and uses of annotation. Specifically, we discuss the need for digital annotation of printed materials and describe how various technologies for digitally augmented paper can be used in support of work practices. The state of the art in terms of both commercial and research solutions is described in some detail, with an analysis of the extent to which they can support both the writing and reading activities associated with annotation. Our framework is based on an extension of the information server that was developed within the Paper++ project to support enhanced reading. It is capable of handling both formal and informal annotation across printed and digital media, exploiting a range of technologies for information capture and display. A prototype demonstrator application for mammography is presented to illustrate both the functionality of the framework and the status of existing technologies.

Only Touching the Surface: Creating Affinities between Digital Content and Paper

by Beat Signer

Paul Luff, Christian Heath, Moira C. Norrie, Beat Signer and Peter Herdman, Proceedings of CSCW 2004, Conference on Computer Supported Cooperative Work. Chicago, USA, November 2004

Despite the wide-ranging recognition that paper remains a pervasive resource for human conduct and collaboration,... more Despite the wide-ranging recognition that paper remains a pervasive resource for human conduct and collaboration, there has been uncertain progress in developing technologies to bridge the paper-digital divide. In this essay we discuss the design of a technology that interweaves developments in new materials, electronics and software, and seeks to provide a cheap and accessible solution to creating new affinities between digital content, in whatever form, and ordinary paper. The technology and its design draws from a broad range of field studies, including research in classrooms and museums. These delineate the requirements and considerations that inform solutions to enhancing paper whilst preserving its integrity. The paper also discusses a naturalistic experiment, an evaluation in a museum, where we assessed the technology and the solution. We also chart the progressive development of this solution and the ways in which seemingly simple actions and issues became reconstituted as highly complex technical and analytic problems.

Overlaying Paper Maps with Digital Information Services for Tourists

by Beat Signer

Moira C. Norrie and Beat Signer, Proceedings of ENTER 2005, 12th International Conference on Information Technology and Travel & Tourism. Innsbruck, Austria, January 2005

Despite the increasing availability of various forms of digital maps and guides, paper still prevails as the main... more Despite the increasing availability of various forms of digital maps and guides, paper still prevails as the main information medium used by tourists during city visits. The authors describe how recent technologies for digitally augmented paper maps can be used to develop interactive paper maps that provide value-added services for tourists through digital overlays. An initial investigation into the use of these maps to support visitors to the Edinburgh festivals is also presented.

A Framework for Cross-media Information Management

by Beat Signer

Beat Signer and Moira C. Norrie, Proceedings of EuroIMSA 2005, International Conference on Internet and Multimedia Systems and Applications. Grindelwald, Switzerland, February 2005

We present an information server architecture, called iServer, that enables cross-media linking based on an... more We present an information server architecture, called iServer, that enables cross-media linking based on an object-oriented hypermedia model. The iServer mixed media platform can easily be extended to support new types of digital or physical multimedia resources. It provides core functionality for link and user management whereas link authoring is handled by plug-ins for specific resource types. Different forms of collaborative cross-media link authoring and link sharing are supported by a distributed iServer implementation based on peer-to-peer technologies.

Using Paper to Support Collaboration in Educational Activities

by Beat Signer

Ella Tallyn, David M. Frohlich, Nadja Linketscher, Beat Signer and Guy Adams, Proceedings of CSCL 2005, Conference on Computer Supported Collaborative Learning. Taipei, Taiwan, May 2005

This paper describes findings from a pilot study that compared the collaborative use by children of three different... more This paper describes findings from a pilot study that compared the collaborative use by children of three different media formats: a paper book, a CD-ROM in a standard PC set-up, and a paper booklet augmented with digital content. These findings show how the book’s ergonomics provide a flexible and easily accessible interface which engenders fluid collaboration between pairs of children. These qualities are also observed when children work with the augmented paper booklet. The value of digital content is demonstrated in a participatory design activity, where we find how digital media can ‘bring to life’ the information presented on paper. In contrast to developments focused narrowly on new technologies, this study presents evidence for the use and value of paper, and paper augmented with digital media, in educational settings.