AKARA: A Flexible Clustering Protocol for Demanding (2009)
Transactional Workloads, A. Correia, J. Pereira, R. Oliveira
Abstract. Shared-nothing clusters are a well known and cost-effective approach to database server scalability, in particular, with highly intensive read-only workloads typical of many 3-tier...
H. Shahbazkia, R. Oliveira, F. Tomaz
Abstract – This paper introduces the project ACID (Automatic Cadastral Information Digitalization), which started in February 2000 and which is financed by the Portuguese FCT (Fundação para a...
GEMs with Double Layred Micropattern Electrodes and their Applications (2008)
Di Mauro, A., Martinengo, P., Nappi, E., Oliveira, R., Peskov, V., Pietropaolo, F., ...
We have developed and tested several new designs of GEM detectors with micropattern electrodes manufactured by microelectronic technology. In one design, the inner layer of the detector electrode...
Weighted Morphometric Shape Analysis of Diatoms (2008)
H. Shahbazkia, R. Oliveira, L. Santos, F. Tomaz
Abstract-In this paper we present an approach for diatom classification on the basis of contour information. First an initial feature set is analysed. Then we present a method to reduce this initial...
Abstract Development and evaluation of database replication in ESCADA ∗ (2008)
A. Sousa, L. Soares, A. Correia, Jr. F. Moura, R. Oliveira
Software based replication is a highly competitive technique to improve the dependability of database systems. However, the unavoidable trade-off between consistency and performance causes some...
Optimal Multi-Frame Correspondence with Assignment Tensors (2008)
R. Oliveira, R. Ferreira, J. P. Costeira
Abstract. Establishing correspondence between features of a set of images has been a long-standing issue amongst the computer vision community. We propose a method that solves the multi-frame...
A. Sousa, J. Pereira, L. Soares, A. Correia, Jr. L. Rocha, R. Oliveira, ...
Database replication based on group communication, or simply GCS-based database replication, has recently been the focus of much attention as a promising technology to achieve strong consistent...
Multi-View Correspondence by Enforcement of Rigidity Constraints Abstract (2008)
R. Oliveira, J. Xavier, J. P. Costeira
Establishing the correct correspondence between features in an image set remains a challenging problem amongst computer vision researchers. In fact, the combinatorial nature of feature matching...
A. Correia, N. Carvalho, J. Pereira, R. Oliveira, L. Rodrigues, S. Guedes
Although database replication has been a standard feature in database management systems for a long time, third party solutions have been enjoying an increasing popularity. These solutions often rely...
Simultaneous VoIP Calls Capacity Over an 802.11 Ad Hoc Network (2008)
Voice over Internet Protocol (VoIP) over a wireless local area network (WLAN) is already an important Internet application. The data rate required for each VoIP stream depends on the used codec and...
A Mutable Protocol for Consensus in Large Groups (2007)
In this paper we propose the mutable consensus protocol, a pragmatic and theoretically appealing approach to enhance the performance of distributed consensus with a large number of participants....
A Scaling Result for Explosive Processes (2007)
Mitzenmacher Division Of, M. Mitzenmacher, R. Oliveira, J. Spencer
We consider the asymptotic behavior of the following model: balls are sequentially thrown into bins so that the probability that a bin with n balls obtains the next ball is proportional to f(n) for...
Clark, B., Agocs, A. G., Oliveira, R., Peskov, V.
We report promising initial results obtained with new resistive-electrode GEM (RETGEM) detectors manufactured, for the first time, using screen printing technology. These new detectors allow one to...
Di Mauro, A., Lund-Jensen, B., Martinengo, P., Nappi, E., Oliveira, R., Peskov, V., ...
The paper summarizes our latest progress in the development of newly introduced micro pattern gaseous detectors with resistive electrodes. These resistive electrodes protect the detector and the...
First Tests of Thick GEMs with Electrodes Made of a Resistive Kapton (2007)
Oliveira, R, Peskov, Vladimir, Pietropaolo, F, Picchi, P
We have developed a new design of a GEM-like detector with single-layer electrodes made of a resistive kapton. This detector can operate at gains close to 10E5 even in pure Ar and Ne and if transited...
First Tests of Thick GEMs with Electrodes Made of a Resistive Kapton (2007)
Oliveira, R., Peskov, V., Pietropaolo, F., Picchi, P.
We have developed a new design of a GEM-like detector with single-layer electrodes made of a resistive kapton. This detector can operate at gains close to 10E5 even in pure Ar and Ne and if transited...
Moral, J., Oliveira, R., Tello Marquina, Julio César, Trapero Casas, Antonio
La Antracnosis del olivo, causada por C. acutatum y C. gloeosporioides, es una grave enfermedad en numerosas regiones olivareras del mundo, originando podredumbre de aceitunas (aceituna jabonosa) y...
Evaluating certification protocols in the partial database state machine (2006)
A. Sousa, A. Correia, F. Moura, J. Pereira, R. Oliveira
Partial replication is an alluring technique to ensure the reliability of very large and geographically distributed databases while, at the same time, offering good performance. By correctly...
Alkan Olsson, J., Theesfeld, I., Schleyer, C., Cairol, D., Turpin, N., Callois, J.M., ...
This Deliverable consists of two parts. The first and consists of the definition and presentation of the restricted package of indicators and operational methodologies to assess them- to be...
Vehicle and mission control of the DELFIM autonomous surface craft (2006)
J. Alves, P. Oliveira, R. Oliveira, A. Pascoal, M. Rufino, L. Sebastião, ...
Abstract — DELFIM is an autonomous surface craft developed at ISR/IST for automatic marine data acquisition and to serve as an acoustic relay between submerged craft and a support vessel. The paper...
The influence of nickel on the adhesion ability of Desulfovibrio desulfuricans (2005)
F. A. Lopes, P. Morin, R. Oliveira, Luis Melo
Adesão de Dessulfovibrio dessulfuricans a PVC e aço - efeito da persença de Niquel
A. Sousa, J. Pereira, L. Soares, A. Correia, Jr. L. Rocha, R. Oliveira, ...
Database replication based on group communication systems has recently been proposed as an effi-cient and resilient solution for large-scale data management. However, its evaluation has been...
Resistencia a los repilos de distintas variedades de olivo (2005)
Moral, J. Del, Avila, A., López Doncel, L. M., Alsalimiya, M., Oliveira, R., Gutiérrez, F., ...
Trapero Casas, Antonio, Oliveira, R., Bouhmidi, K.
La Antracnosis del olivo, causada por especies fúngicas del género Colletotrichum, es una enfermedad grave ampliamente distribuida en todas la regiones del mundo donde se cultiva el olivo. La...
The mutable consensus protocol (2004)
J. Pereira, R. Oliveira, U. Minho, U. Minho
In this paper we propose the mutable consensus protocol, a pragmatic and theoretically appealing approach to enhance the performance of distributed consensus. First, an apparently inefficient...
Neem: Network-friendly epidemic multicast (2003)
J. Pereira, L. Rodrigues, M. J. Monteiro, U. De Lisboa, U. De Lisboa, R. Oliveira, ...
Epidemic, or probabilistic, multicast protocols have emerged as a viable mechanism to circumvent the scalability problems of reliable multicast protocols. However, most existing epidemic approaches...
NEEM: Network-friendly Epidemic Multicast (2003)
J. Pereira, R. Oliveira, U. Do Minho, U. Do Minho, L. Rodrigues, M. J. Monteiro, ...
Epidemic, or probabilistic, multicast protocols have emerged as a viable mechanism to circumvent the scalability problems of reliable multicast protocols. However, most existing epidemic approaches...
Primary-backup replication: From a time-free protocol to a time-based implementation (2001)
Oliveira, R., Pereira, J., Schiper, A.
Fault-tolerant control systems can be built by replicating critical components. However, replication raises the issue of inconsistency. Multiple protocols for ensuring consistency have been described...
Identificaçao de Unides de Paisagem: metodologia aplicada a Portugal continental (2001)
Pinto Correia, Teresa, Oliveira, R.
Este artigo apresenta os conceitos e a metodologia utilizados no estudo "Identificação e Caracterização da Paisagem em Portugal Continental", elaborado para a DGOT-DU, Ministério do Ambiente e...
Primary-backup replication: From a time-free protocol to a time-based implementation (2001)
Oliveira, R., Pereira, J., Schiper, A.
Fault-tolerant control systems can be built by replicating critical components. However, replication raises the issue of inconsistency. Multiple protocols for ensuring consistency have been described...
Identificação de unidades de paisagem: Metodologia aplicada a Portugal Continental (2001)
T. Pinto-Correia, A. Cancela D’Abreu, R. Oliveira
IDENTIFICATION AND CHARACTERISATION OF LANDSCAPE IN PORTUGAL –This paper presents the concepts and methodology used in the study «Identification and characterisation of landscape in continental...
Consensus in Asynchronous Distributed Systems: A Concise Guided Tour (1999)
Guerraoui, R., Hurfin, M., Mostefaoui, A., Oliveira, R., Raynal, M., Schiper, A., ...
It is now recognized that the Consensus problem is a fundamental problem when one has to design and implement reliable asynchronous distributed systems. This chapter is on the Consensus problem. It...
Consensus in Asynchronous Distributed Systems: a Concise Guided Tour (1999)
R. Guerraoui, M. Hurfin, A. Mostefaoui, R. Oliveira, M. Raynal, A. Schiper
It is now recognized that the Consensus problem is a fundamental problem when one has to design and implement reliable asynchronous distributed systems. This chapter is on the Consensus problem. It...
A Scaling Result for Explosive Processes (1996)
M. Mitzenmacher, R. Oliveira, J. Spencer
We consider the asymptotic behavior of the following model: balls are sequentially thrown into bins so that the probability that a bin with n balls obtains the next ball is proportional to f(n) for...