Engineering applications that use Active DBMSs (ADBMSs) often need to group activities into modes that are shifted during the execution of different tasks. This paper presents a mechanism for grouping rules into contexts that can be activated and deactivated dynamically. The ADBMS monitors only those events that affect rules of activated contexts. By dynamic rule grouping the rules to be monito...

This paper is a review of works about the use of the logpolar image model for pattern recognition purposes. Particular attention is paid to the rotationand scale-invariant pattern recognition problem, which is simplified by the log-polar mapping. In spite of this advantage, ordinary translations become a complicated image transform in the logpolar domain. Two approaches addressing the estimatio...

A new algorithm to automatically detect the boundary of optic disk in color fundus images is proposed. The optic disk is located by principal component analysis (PCA) based model, which is employed to initialize active shape model (ASM) to detect the disk boundary. ASM is modi%ed with two aspects: one is the self-adjusting weight in the transformation from shape space to image space; the other ...

when z is near the dominant singularity ρ. We provide asymptotic results about the size of the smallest components in random combinatorial structures for the cases 0 < α < 1 and any β, and α < 0 and β = 0. The particular case α = 0 and β = 1, the so-called exp-log class, has been treated in previous papers. We also provide similar asymptotic estimates for combinatorial objects with a restricted...

In this thesis, we explore the identification of expert users in online communities. We are interested in modeling user behavior and providing deeper insights into how a user evolves and interacts in a given community. Our goal in this research is to help community administrators in identifying top contributors, and so help them in retaining these users and sustaining the communities. We have f...

A method for the automatic reconstruction of 3D objects from multiple camera views for 3D multimedia applications is presented. Conventional 3D reconstruction techniques use equipment that restrict the flexibility of the user. In order to increase this flexibility, the presented method is characterized by a simple measurement environment, that consists of a new calibration pattern placed below ...