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Publications

2011

Concatenative singing voice resynthesis

Authors
Fonseca, N; Ferreira, A; Rocha, AP;

Publication
17th DSP 2011 International Conference on Digital Signal Processing, Proceedings

Abstract
The concept of capturing the sound of something for later replication is not new, and it is used in many synthesizers. But capturing sounds and use them as an audio effect, is less common. This paper presents an approach for the resynthesis of a singing voice, based on concatenative techniques, that uses pre-recorded audio material as an high level semantic audio effect, replacing an original audio recording with the sound of a different singer, while trying to keep the same musical/phonetic performance. © 2011 IEEE.

2011

A prototype for indoor orientation of blind people combining multilateration, inertial and magnetic techniques, using 802.11 networks and mobile devices

Authors
Mansilha, R; Gomes, JP; Cunha, CR;

Publication
Proceedings of the 6th Iberian Conference on Information Systems and Technologies, CISTI 2011

Abstract
In this paper, which deals with an work in progress, we present the results of a prototype that aims to enable blind people to autonomously acquire consumer goods in hypermarkets. The prototype implements an architecture that combines inertial, magnetic and multilateration techniques, supported by 802.11 networks and mobile devices. We present the preliminary results of positioning and orientation obtained in tests carried out in a hypermarket, and we discuss the main constraints observed as well as the challenges for future work. © 2011 AISTI.

2011

Sliding PCA Fuzzy Clustering Algorithm

Authors
Salgado, P; Gonc¸alves, L; Igrejas, G; Simos, TE; Psihoyios, G; Tsitouras, C; Anastassi, Z;

Publication
NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2011: INTERNATIONAL CONFERENCE ON NUMERICAL ANALYSIS AND APPLIED MATHEMATICS, VOLS A-C

Abstract
This paper proposes a new robust approach to nonlinear clustering based on the Principal Component Analysis (PCA) approach. A robust c-means partition is derived by using the natural PCA noise-rejection mechanism and the nonlinearity captured by a sliding process of the clusters prototype. A non-linear extension of PCA has been developed for detecting the lower-dimensional representation of real world data sets. For these cases local linear approaches are used widely because of their computational simplicity and understandability. We will present a new method that joins (merges) the fuzzy clustering algorithm with a local sliding PCA analysis. With this strategy it is possible to identify the non-linear relations and obtain morphological information of the data. The Sliding PCA-Fuzzy cluster algorithm (SPCA-FCA) is a fuzzy clustering algorithm that estimates local principal component vectors as the vectors spanning prototypes of clusters, performed on the neighborhood of the center of cluster and normal approximations in order to estimate a tangent surface that characterizes the trend and curvature of the data points or contours region. Numerical experiments demonstrate that the proposed method is useful for capturing cluster cores by rejecting noise samples, and we can easily assess cluster validity by using cluster-crossing curves.

2011

An OpenGL-based eclipse plug-in for visual debugging

Authors
Riboira, A; Abreu, R; Rodrigues, R;

Publication
Proceedings - International Conference on Software Engineering

Abstract
Locating components which are responsible for observed failures is the most expensive, error-prone phase in the software development life cycle. We present an Eclipse Plug-in that aims to fill some of the automatic debugging tools gaps: the lack of a visualization tool that provides intuitive feedback about the defect distribution over the code base, and easy access to the faulty locations. Copyright 2011 ACM.

2011

How Pervasive And Mobile Computing Can Help Organizations To Include People With Visual Disabilities On Their Client-Approach Strategy?

Authors
Cunha, CR; Gomes, JP;

Publication
CREATING GLOBAL COMPETITIVE ECONOMIES: A 360-DEGREE APPROACH, VOLS 1-4

Abstract
Organizations have in-built social responsibility to society. The evolution of technology have enable organizations to interact in an innovatively and more close approach to their clients. But this evolution has not included people with special needs like blind people. And, even those organizations that have enable some kind of support-approach to blind people, have typically disjointed, incomplete and typically parallel approaches; compared to their mass-client standard approach. This paper discusses the potential of Pervasive and Mobile Computing to support, not just an innovative and unified approach, but also a real possibility of promoting real inclusion of blind people in what concerns to the delivery of information and services organizations offer. This paper also represents a reflection and a mind shaking attempt, while the authors are working in allowing blind people an autonomous buying process, in hypermarkets, supported by the use of wireless networks and modern mobile devices, with multiple technologies support, like Wi-Fi and inertial and magnetic sensors.

2011

High doses of olive leaf extract induce liver changes in mice

Authors
Arantes Rodrigues, R; Henriques, A; Pires, MJ; Colaco, B; Calado, AM; Rema, P; Colaco, A; Fernandes, T; De la Cruz, PLF; Lopes, C; Fidalgo Goncalves, L; Vilela, S; Pedrosa, T; Peixoto, F; Oliveira, PA;

Publication
FOOD AND CHEMICAL TOXICOLOGY

Abstract
Virtually ever since it was first commercialized in 1995, there have been several studies focusing on the use of olive leaf extract (OLE) as a natural therapy and its medical properties. The aim of this study was to investigate the effects of three different concentrations of OLE on the function of mice livers over the course of 14 weeks. Female ICR mice were divided into four groups, depending on OLE concentration used: 0%, 0.25%, 0.5%, and 0.75%. Alanine aminotransferase, alkaline phosphatase, total bilirubin and albumin serum concentrations were all measured. Histopathological changes of the liver were observed after haematoxylin and eosin, reticulin, and Masson's trichrome staining was carried out while liver mitochondrial bioenergetics were also evaluated. Alanine aminotransferase and alkaline phosphatase serum enzyme activities increased significantly in the groups in which 0.5% and 0.75% OLE concentrations were used. Histologically, all the groups exposed to OLE exhibited hyperplasia of the bile ducts, cholestasis, hepatocyte necrosis and inflammatory infiltrated. Hepatic fibrosis was observed in the groups featuring 0.5% and 0.75% OLE concentrations. The mitochondrial membrane potential, respiratory control ratio and ADP/O of samples from animals fed the higher OLE concentration was significantly decreased when compared to the control group.

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