Pedro Sousa

Forecasting Internet traffic by Neural Networks under univariate and multivariate strategies (2008)

A number of Traffic Engineering (TE) approaches have been recently proposed to improve the performance of network routing protocols, both developed over MPLS and intra-domain protocols such as OSPF....

Rio, Miguel, Sousa, Pedro, Rocha, Miguel

By improving Internet traffic forecasting, more efficient TCP/IP traffic control and anomaly detection tools can be developed, leading to economic gains due to better resource management. In this...

Chapter submitted to the book “Enterprise Modeling and Computing with UML”, IRM Press. Revised version. November 2005. Enterprise Architecture Modeling with the Unified Modeling Language (2008)

Pedro Sousa, Artur Caetano, André Vasconcelos, Carla Pereira, José Tribolet

This chapter describes the key concepts for modeling the organization’s enterprise architecture using the Unified Modeling Language (UML). Enterprise architecture consists on defining and...

Abstract Development of Distributed Applications with Separation of Concerns (2008)

António Rito Silva, Pedro Sousa, José Alves Marques

The development of distributed applications is an open area involving researchers from different communities. We propose an object-oriented approach to the development of distributed applications...

Information System Architecture Metrics: an Enterprise Engineering Evaluation Approach (2008)

André Vasconcelos, Pedro Sousa, José Tribolet

Abstract: Although some important technological developments have been achieved during last decade, information systems still do not answer efficiently enough to the continuous demands that...

Open Issues On Information System Architecture (2008)

Research Domain The, André Vasconcelos, Carla Marques Pereira, Pedro Sousa, José Tribolet

Currently organizations, pushed by several business and technological changes, are more concern about Information systems (IS) than ever. Though organizations usually still face each IS as a...

Multiconstrained optimization of networks with multicast and unicast traffic (2008)

Application of dynamic factor analysis in the assessment of Iberian anglerfish stocks (2008)

This paper presents an OSPF routing optimization framework taking into account a set of multiconstrained QoS requirements of the networking domain. The proposed optimization approach, based on...

Azevedo, Manuela, Duarte, Rafael, Cardador, Fátima, Sousa, Pedro, Fariña, Celso, Sampedro, Paz, ...

Azevedo, M., Duarte, R., Cardador, F., Sousa, P., Fariña, C., Sampedro, P., Landa, J., and Costas, G. 2008. Application of dynamic factor analysis in the assessment of Iberian anglerfish stocks....

Local Serialization Pattern (2007)

António Rito Silva, João Pereira, Pedro Sousa

This paper describes the Local Serialization pattern which decouples object concurrency control policies from objectspecific algorithm semantics and concurrency generation policies. The pattern was...

Object Clustering in Persistent and Distributed Systems (2007)

Pedro Sousa, José Alves Marques

This paper presents a simple approach for clustering objects in persistent systems. The proposed mechanism groups objects based on their current relations in such way that only a single object is...

Selection of Reverse Engineering Methods for Relational Databases (2007)

Lurdes Pedro-de-jesus, Pedro Sousa, Av Rovisco Pais

The problem of choosing a method for the reverse engineering of relational database systems is not trivial. Methods have different input requirements and each legacy system has its particular...

Selection of Reverse Engineering Methods for Relational Databases (2007)

Lurdes Pedro-de-jesus, Pedro Sousa

The problem of choosing one method to use in the reverse engineering of existing relational database systems is not a trivial one. On one hand, methods hold different input requirements. On the other...

Meeting the Software Engineering Challenges of Adaptive Mobile Applications (2007)

Rajesh Krishna, Balan Joho, Pedro Sousa, Mahadev Satyanarayanan

interpreted as representing the official policies, either expressed or implied, of NSF, DARPA, USN, USENIX, nor the U.S. government. A critical factor for the commercial success of mobile and...

Meeting the Software Engineering Challenges of Adaptive Mobile Applications (2007)

Rajesh Krishna, Balan Joho, Pedro Sousa, Mahadev Satyanarayanan

interpreted as representing the official policies, either expressed or implied, of NSF, DARPA, USN, USENIX, nor the U.S. government. A critical factor for the commercial success of mobile and...

Adaptation: This Won’t Hurt a Bit! (2007)

Rajesh Krishna, Balan João, Pedro Sousa, Soyoung Park, Tadashi Okoshi, Jason Flinn, ...

With the prevalance of handheld devices, it is increasingly necessary to build systems that adapt applications according to the available resources. These systems offer new and constantly changing...

platform on top of the (2007)

Miguel Castro, Nuno Neves, Pedro Trancoso, Pedro Sousa

A distributed object-oriented programming

Meeting the Software Engineering Challenges of Adaptive Mobile Applications (2007)

Rajesh Krishna, Pedro Sousa, Mahadev Satyanarayanan

grant. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the ocial policies, either expressed or implied, of NSF, DARPA, USN,...

Topology aware Internet traffic forecasting using neural networks (2007)

Rio, Miguel, Sousa, Pedro, Rocha, Miguel

Forecasting Internet traffic is receiving an increasing attention from the computer networks domain. Indeed, by improving this task efficient traffic engineering and anomaly detection tools can be...

Class-based OSPF traffic engineering inspired on evolutionary computation (2007)

Sousa, Pedro, Rocha, Miguel, Rio, Miguel

This paper proposes a novel traffic engineering framework able to automatically provide near-optimal OSPF routing configurations for QoS constrained scenarios. Within this purpose, this work defines...

Automatic provisioning of QoS aware OSPF configurations (2007)

Sousa, Pedro, Rocha, Miguel, Rio, Miguel

This paper presents a contribution for the development of network management tools able to automatically provide QoS aware routing configurations. In this perspective, a traffic engineering framework...

Evolutionary computation for quality of service internet routing optimization (2007)

Efficient OSPF weight allocation for intra-domain QoS optimization (2006)

In this work, the main goal is to develop and evaluate a number of optimization algorithms in the task of improving Quality of Service levels in TCP/IP based networks, by configuring the routing...

Sousa, Pedro, Rocha, Miguel, Rio, Miguel

This paper presents a traffic engineering framework able to optimize OSPF weight setting administrative procedures. Using the proposed framework, enhanced OSPF configurations are now provided to...

Qos constrained internet routing with evolutionary algorithms (2006)

Internet traffic forecasting using neural networks (2006)

OSPFOSPF is the most common intra-domain routing protocol in Wide Area Networb. Thus, optimiaing OSPF weighb will produce tools for traflc engineering with Quality of Sewice constraints, without...

Internet Traffic Forecasting using Neural Networks (2006)

The forecast of Internet traffic is an important issue that has received few attention from the computer networks field. By improving this task, efficient traffic engineering and anomaly detection...

Paulo Cortez, Miguel Rio, Miguel Rocha, Pedro Sousa

Abstract — The forecast of Internet traffic is an important issue that has received few attention from the computer networks field. By improving this task, efficient traffic engineering and anomaly...

A multiconstrained QoS aware scheduler for class-based IP networks (2005)

Information System Architecture Evaluation: From Software to Enterprise Level Approaches (2005)

This article presents a modular scheduler with powerful semantics able to differentiate simultaneously multiple QoS metrics in classbased IP networks. In opposition to traditional scheduling...

André Vasconcelos, Pedro Sousa, José Tribolet, Ceo Centro, Engenharia Organizacional

In order to ensure that technology supports business needs and that IT investments deliver the desired value, it is fundamental to define an Information System Architecture (ISA) and measure its...

Improving the quality and reliability of traffic differentiation in IP networks (2004)

A multi-constrained QoS aware scheduler for class-based IP networks (2004)

This article presents a modular scheduling architecture for multi-QoS metric differentiation in class-based IP networks. The rationale of the supported differentiation modules is presented,...

Enhancing delay differentiation semantics of class-based IP networks (2004)

This article presents a novel modular scheduler with powerful semantics able to differentiate simultaneously multiple QoS metrics in class-based IP networks. In opposition to traditional scheduling...

Improving the Quality and Reliability of Traffic Differentiation in IP Networks (2004)

This paper presents a time-sensitive scheduler oriented to delay differentiation in class-based networks, studying its behaviour from a single node to an end-to-end perspective. The novel feature of...

A Multi-constrained QoS Aware Scheduler for Class-based IP Networks (2004)

This article presents a modular scheduling architecture for multi-QoS metric differentiation in class-based IP networks. The rationale of the supported differentiation modules is presented,...

Enhancing Delay Differentiation Semantics of Class-based IP Networks (2004)

This article presents a novel modular scheduler with powerful semantics able to differentiate simultaneously multiple QoS metrics in class-based IP networks. In opposition to traditional scheduling...

Scheduling time-sensitive IP traffic (2003)

This paper presents a time-sensitive scheduler oriented to delay differentiation in class-based networks, studying its behaviour from a single node to an end-to-end perspective. The novel feature of...

Internet com qualidade de serviço no suporte ao E-business (2003)

This article presents an hybrid priority queuing model based scheduler for real-time traffic differentiation. The proposed scheduler is designed as a mechanism to provide queuing delay...

Carvalho, Paulo, Sousa, Pedro, Lima, Solange

Scheduling Time-Sensitive IP Traffic (2003)

End-to-end delay differentiation of IP traffic aggregates using priority queuing models (2002)

This article presents an hybrid priority queuing model based scheduler for real-time traffic differentiation. The proposed scheduler is designed as a mechanism to provide queuing delay...

Tuning delay differentiation in IP networks using priority queueing models (2002)

This article evaluates the use of Priority Queuing (PQ) Models to achieve delay differentiation in networks operating under the Class of Services paradigm. Three PQ variants are considered: the...