Evaldo Pelaes

Evaldo Pelaes
Federal University of Pará | UFPA · Faculty of Computer Engineering (ENGCOMP)

Doctor of Engineering

About

40
Publications
6,253
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130
Citations
Citations since 2016
11 Research Items
57 Citations
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20162017201820192020202120220246810
20162017201820192020202120220246810

Publications

Publications (40)
Article
G.fast is one of the most recent DSL system standardized by ITU. It aims to achieve transmission rates of the order of Gbps over short loops, using bandwidth of 106 MHz or 212 MHz. Owing to its large bandwidth, the G.fast is susceptible to interference from a wide range of sources, one of the most damaging being alien crosstalk. This study provides...
Article
Remote sensing image databases and geographic information system have the potential to act as accurate tools for environmental monitoring. Carajas Mountains are an important mineral deposit in Brazil and as environmental laws protect a great portion of this region, they have been at the core of conflicts involving human and nature interests. The bi...
Article
The error performance of LDPC-coded QAM systems, such as those implied by the G.hn and IEEE 802.11n standards, can be considerably improved by bit mapping techniques. Recently, a simple root-like bit mapping has been proposed by the authors. It is based on the principle that bits transmitted through “good” sub-channels can help bits transmitted thr...
Conference Paper
Full-text available
The DSL technologies are expected to face many interferences in conventional deployments, such as RFI. One way to mitigate the destructive effects of RFI is to use the correlation between the RFI observed in differential mode and the RFI observed in common mode. This strategy is considered in many works found in the literature. However, they do not...
Article
Full-text available
p>En este artículo son propuestos procedimientos para la construcción de matrices base embazado en el álgebra moderna y en la geometría. Estas matrices sirven de plataforma para generar las matrices de verificación de paridad en la corrección de borrado en ráfaga a través de códigos LDPC, por medio de superposición en las matrices base y movimiento...
Conference Paper
G.fast is the most recent ITU-T standard for copper-based transmission, which targets at short distances and adopts a bandwidth of 106 MHz extensible to 212 MHz. In several scenarios G.fast systems will be composed by or coexist with uncoordinated lines, which are sources of strong crosstalk. This work focuses on evaluating an alien (out-of-domain)...
Conference Paper
Full-text available
Earth. Remote sensing data are an important source of information for a variety of applications, such as coastal mapping applications, monitor land use, and chart wildlife habitats, for example. One of the most important task for these data analysis is the segmentation. Segmentation means the action of merging neighbouring pixels into segments (or...
Chapter
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Nowadays, many works are dedicated to improve the research results, previously achieved manually, by computational solutions. On light of this, the presented work aims to overcome a common problem in many satellite images, which is the presence of undesirable atmospheric components such as clouds and shadows at the time of scene capture. The presen...
Article
Full-text available
The digital image processing is widely studied in the scientific literature. Techniques for image treatment derived from satellites are continuously developed and improved. Although most of these techniques are readily available to the researchers, it is known that a minimum knowledge in programming should be purchased by those who wish to use thes...
Article
Full-text available
This work is based on the connection between two important and growing fields in computing: Computer-Supported Cooperative Work (CSCW) and Geographic Information Systems (GIS). In this kind of system is important the concept of teamwork, due to the complexity and size of the projects underway around the world, where there may be situations where us...
Conference Paper
This paper presents a new bit mapping strategy which aims to improve the performance of a LDPC-Coded QAM system such as the one specified in the G.hn standard. The proposed bit mapping is based on the assumption that bits transmitted in “good” sub-channels, with higher gains, help bits transmitted in “bad” sub-channels. This is possible by enforcin...
Conference Paper
Full-text available
The broad applicability of Digital Image Processing (DIP) has generated many scientific effort in this area. Associated to Remote Sensing, the DIP area gained significant importance with regard to the study and analysis of large regions, however, images acquired by sensors are subject to interference and noise. Due to this, scientific efforts are b...
Conference Paper
Full-text available
The presence of clouds in remote sensory images can represent an impairment factor to studies about the land use, mainly the governmental studies that produce official statistics about the land use (see the Brazilian statistic about the Legal Amazon deforestation). The technological advances do not allow that orbital sensors capture images without...
Conference Paper
Full-text available
The main goal of this work is to propose an efficient, and so automatic as possible process for replace clouds and shadows regions from satellite images. The motivation comes from the problems caused by these elements, among them: hinder the identification of image objects, prejudice urban and environmental monitoring, and disfavor crucial steps of...
Article
Full-text available
The literature analysis of propagation models has investigated different statistical prediction methods to identify appropriate techniques for this purpose. This article presents the results of propagation channel modeling, based on multivariate time series models using data collected in measurement campaigns and the main characteristics of urbaniz...
Article
Full-text available
This paper presents the evaluation of two approaches, widely used in the inpainting literature, applied in the context of the atmospheric noise removal, such as fog, clouds-dense and sparse-and shadows, which often occur in remote sensing images. The presence of such elements affect, in many ways, the image processing in an environmental or urban m...
Article
With the development of PLC technology (Power Line Communication), which allows data transmission at high speed by the power grid. Emerged as a technology solution for last mile for transmission triple play. This article presents the analysis of VoIP and streaming videos in high definition through a residential indoor PLC network.
Article
Full-text available
This work presents the simulation and analysis of the impact of impulsive noise on video transmission over ADSL using the Ptolemy II framework. The implemented software modem includes channel coding and modulation used in the ADSL standard and an impulsive noise channel model. In the results, the effect of the use of different interleaver depth val...
Conference Paper
Full-text available
This paper proposes a new technique to smooth undesirable elements of the atmosphere, such as fogs, clouds and shadows, which damage and lead to loss of image data. In our approach, an efficient way to detect clouds and shadows is presented. The method applies constants related to such undesirable elements, as well as a High boost Filter in the hom...
Conference Paper
Full-text available
This work has as main objective to overcome a frequent problem in remote sensing, which is the undesirable presence of atmospheric constituents as scattered clouds, fogs and mists. The presence of such elements can affect the urban and environmental monitoring, as well as subsequent steps of the digital image processing such as segmentation and cla...
Conference Paper
Full-text available
This paper presents the evaluation of two approaches widely used in the inpainting literature, applied in the context of atmospheric noise removal, such as fog, dense and sparse clouds and shadows, which often occurs in remote sensing images. One approach uses the technique of nearest neighbor interpolation for the information dissemination by a DC...
Article
Full-text available
The development and assessment of spectrum management methods for the copper access network are usually conducted under the assumption of accurate channel information. Acquiring such information implies, in practice, estimation of the crosstalk coupling functions between the twisted-pair lines in the access network. This type of estimation is not s...
Article
Full-text available
There are many spectrum balancing algorithms to combat the deleterious impact of crosstalk interference in digital subscriber lines (DSL) networks. These algorithms aim to find a unique operating point by optimizing the power spectral densities (PSDs) of the modems. Typically, the figure of merit of this optimization is the bit rate, power consumpt...
Article
Full-text available
This work presents the use of the wavelet transform and computational intelligence techniques to quantify voltage short-duration variation in electric power systems, with respect to time duration and magnitude. The wavelet transform is used to determine the event duration, as well as for obtaining a characteristic curve relating the signal norm as...
Conference Paper
Full-text available
The development and assessment of spectrum management methods for the copper access network are usually conducted under the assumption of accurate channel information. Acquiring such information implies, in practice, estimation of the crosstalk coupling functions between the twisted-pair lines in the access network. However, this estimation is not...
Article
The emerging multiuser transmission techniques for enabling higher data rates in the copper-access network relies upon accurate knowledge of the twisted-pair cables. In particular, the square-magnitude of the crosstalk channels between the transmission lines are of interest for crosstalk-mitigation techniques. Acquiring such information normally re...
Article
The blocking effect is a common problem that is always present in image coding when using the blocking transform. A simple method for image coding, with low blocking effect, using pre- and post-axis rotation and the discrete sine transform, is proposed. It uses the overlap of only the sample and the total number of transform coefficients remains th...
Conference Paper
The blocking effect is a problem that is always present in image coding by blocking transform. A simple method for image coding, with low blocking effect, using pre- and post-axis rotation and the discrete sine transform, is presented. The method was implemented, and the results obtained by simulation in the image coding are compared with image cod...
Article
Full-text available
This article presents a classification method regarding voltage disturbance for three-phase signals obtained from disturbances recorded data in electric power systems. The proposed method uses wavelet transform to obtain a characteristic vector for voltage phases a, b and c, and a probabilistic neural network is used for classification. The classif...
Article
Video segmentation is a fundamental step in many vision systems including video surveillance and traffic monitor-ing. Background subtraction is a method typically used to segment moving regions in video sequences taken from a static cam-era by comparing each new frame to a model of the scene background. In this paper, a hardware system for video se...

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Projects (3)
Project
O presente projeto pretende avaliar as características do AXT que impactam na correlação espacial da interferência observada no grupo vetorizado e que limitam o desempenho alcançado pelos métodos de mitigação de AXT baseados em predição em situações com transmissão G.fast. Especial atenção é dada a ambos o comportamento a respeito do número de fontes de AXT e ao desbalanceamento resultante dos métodos de mitigação. Este projeto também estenderá o trabalho apresentado em (Gomes et al 2015), motivado pela importância de AXT devido seu impacto em sistemas G.fast.