Polarity lexicons are lists of words (or meanings) where each entry is labelled as positive, negative or neutral. These lists are not available for different languages and specific domains. This work proposes and evaluates a new algorithm to classify words as positive, negative or neutral, relying on a small seed set of words, a common dictionary and a propagation algorithm. We evaluate the pos...

This paper considers error propagation in three dimensional geometric constructions using a geometric approach. First, we present definitions and constructions of tolerance zones for various fundamental elements in Euclidean space. Then, we study in detail the propagation of errors during several geometric computations, including the the distance between two skew lines, reflections, projections...

We carry out a comprehensive feasibility study for a real-time cm-level localization of a predefined terrestrial target from a MAV-based autonomous platform. Specifically, we conduct an error propagation analysis which quantifies all potential error sources, and accounts for their respective contribution to the final result. Furthermore, we provide a description of a practical MAV system using ...

Structural analysis and design has to be performed by considering uncertainties both in loading and structural properties respectively. While in traditional analysis and design procedures these uncertainties were take into acount in a qualitative manner in order to adhere to deterministic concepts modern procedures are shown to allow their quantitative processing. This way a rational treatment ...

We were inspired by the role of co-stimulation in the Biological immune system (BIS). We propose and evaluate an algorithm for energy efficient misbehavior detection in ad hoc wireless networks. Besides co-stimulation, this algorithm also takes inspiration from the capability of the two vital parts of the BIS, the innate and the adaptive immune system, to react in a coordinated way in the prese...

We are concerned here with improving long range stereo by filtering image sequences. Traditionally, measurement errors from stereo camera systems have been approximated as 3-D Gaussians, where the mean is derived by triangulation and the covariance by linearized error propagation. However, there are two problems that arise when filtering such 3-D measurements. First, stereo triangulation suffer...

In this paper we address the problem of estimating the horizontal vanishing line, making use of motion statistics derived from a video sequence. The computation requires the satisfying of a number of corresponding object’s height measurement; and in our approach these are extracted using motion statistics. These easy-to-compute statistics enable accurate determination of average shape of every ...

The OWL is a language for representing ontologies but it is unable to capture the uncertainty about the concepts for a domain. To address the problem of representing uncertainty, we propose in this paper, the theoretical aspects of our tool BeliefOWL which is based on evidential approach. It focuses on translating an ontology into a directed evidential network by applying a set of structural tr...

The parton momentum density distributions of the proton were obtained from a NLO QCD analysis of HERA and fixed target structure function data. The resulting parton distribution set includes the full information on errors and correlations.

The dense deployments of wireless sensor networks offer the opportunity to develop novel communication techniques based on multi-node cooperation that can perform efficiently even over harsh fading channels. Several key contributions in the development and analysis of such techniques are provided. First, prior studies on cooperative communication and routing are extended by explicitly consideri...