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Marin-Castro H.M.,Polytechnic University of Victoria | Sosa Sosa V.J.,CINVESTAV
Journal of Intelligent Information Systems | Year: 2017

Web Query Interfaces (WQIs) play a very important role in retrieving Deep Web content. WQIs allow users to query domain-specific databases for obtaining information of interest from diverse domains such as car rentals, hotels, airfare, etc. As the number of WQIs on the web is increasing drastically, some research efforts are focused on building a single (unified) WQI that allows users to query and integrate information available in different web databases related to a specific domain. A very important task in this WQIs’ integration process is the extraction, modeling and understanding of WQIs’ semantic content. However, this task is challenging because of the great heterogeneity in the design of WQIs. This paper presents a novel tree-based approach for the modeling and understanding of WQIs. A tree schema called the Visual Reduced Tree (VR-Tree) is built from the tree produced by a web browser’s render engine, applying a set of well- defined functions and guided by a set of heuristic rules to identify the WQI’s main components and their relationships. The proposed strategy was evaluated by running a collection of experiments over the Tel-8 and ICQ datasets from the UIUC repository. The results show that the automatic modeling of WQIs is possible with a high degree of precision if compared against previous approaches, simplifying the modeling task by only considering visual and spatial properties of WQI components using the VR-Tree schema proposed in this work. © 2017 Springer Science+Business Media New York

Morales-Sandoval M.,Polytechnic University of Victoria | Feregrino-Uribe C.,National Institute of Astrophysics, Optics and Electronics | Kitsos P.,Hellenic Open University
IET Computers and Digital Techniques | Year: 2011

This work presents novel multipliers for Montgomery multiplication defined on binary fields GF(2m). Different to state of the art Montgomery multipliers, this work uses a linear feedback shift register (LFSR) as the main building block. The authors studied different architectures for bit-serial and digit-serial Montgomery multipliers using the LFSR and the Montgomery factors xm and xm-1. The proposed multipliers are for different classes of irreducible polynomialsgeneral, all one polynomials, pentanomials and trinomials. The results show that the use of LFSRs simplifies the design of the multipliers architecture reducing area resources and retaining high performance compared to related works. © 2011 The Institution of Engineering and Technology.

Miranda R.,Polytechnic University of Victoria
CCE 2012 - 2012 9th International Conference on Electrical Engineering, Computing Science and Automatic Control | Year: 2012

This paper deals with the analysis of a closed-loop identification technique applied to a DC servomechanism from a passivity point of view. It is shown that the closed-loop system together with the identification algorithm can be divided into simpler subsystems easier to analyze and then, many properties related to passivity and stability can be deduced. Furthermore, it is shown that with this separation approach we have the freedom to select many controller structures, which could let to improve the performance of the identification algorithm, even in presence of perturbation signals. © 2012 IEEE.

Morales-Sandoval M.,Polytechnic University of Victoria | Feregrino-Uribe C.,National Institute of Astrophysics, Optics and Electronics | Kitsos P.,Hellenic Open University | Cumplido R.,National Institute of Astrophysics, Optics and Electronics
Computers and Electrical Engineering | Year: 2013

Montgomery Multiplication is a common and important algorithm for improving the efficiency of public key cryptographic algorithms, like RSA and Elliptic Curve Cryptography (ECC). A natural choice for implementing this time consuming multiplication defined on finite fields, mainly over GF(2m), is the use of Field Programmable Gate Arrays (FPGAs) for being reconfigurable, flexible and physically secure devices. FPGAs allow the implementation of this kind of algorithms in a broad range of applications with different area-performance requirements. In this paper, we explore alternative architectures for constructing GF(2m) digit-serial Montgomery multipliers on FPGAs based on Linear Feedback Shift Registers (LFSRs) and study their area-performance trade-offs. Different Montgomery multipliers were implemented using several digits and finite fields to compare their performance metrics such as area, memory, latency, clocking frequency and throughput to show suitable configurations for ECC implementations using NIST recommended parameters. The results achieved show a notable improvement against FPGA Montgomery multiplier previously reported, achieving the highest throughput and the best efficiency. © 2012 Elsevier Ltd. All rights reserved.

Pena-Gonzalez R.H.,Polytechnic University of Victoria | Nuno-Maganda M.A.,Polytechnic University of Victoria
Midwest Symposium on Circuits and Systems | Year: 2014

Detect, classify and keep track, in real-time, on different kinds of objects or vehicles that are moving on a road is crucial for traffic managements systems, among other research areas. In this paper, a vision based system to detect, track, count and classify moving vehicles, on any kind of road, is shown. The data acquisition system consists of a HD-RGB camera placed on the road, while the information processing is performed by clustering and classification algorithms. The system obtained an efficiency score over the 95 percent in test cases, as well, the correct classification of 85 percent of the test objects. Also, the system achieves 30 fps in image processing with a resolution of 1280×720. © 2014 IEEE.

Polanco Gonzalez C.,National Autonomous University of Mexico | Polanco Gonzalez C.,Autonomous University of the State of Morelos | Nuno Maganda M.A.,Polytechnic University of Victoria | Arias-Estrada M.,National Institute of Astrophysics, Optics and Electronics | del Rio G.,National Autonomous University of Mexico
PLoS ONE | Year: 2011

Exhaustive prediction of physicochemical properties of peptide sequences is used in different areas of biological research. One example is the identification of selective cationic antibacterial peptides (SCAPs), which may be used in the treatment of different diseases. Due to the discrete nature of peptide sequences, the physicochemical properties calculation is considered a high-performance computing problem. A competitive solution for this class of problems is to embed algorithms into dedicated hardware. In the present work we present the adaptation, design and implementation of an algorithm for SCAPs prediction into a Field Programmable Gate Array (FPGA) platform. Four physicochemical properties codes useful in the identification of peptide sequences with potential selective antibacterial activity were implemented into an FPGA board. The speed-up gained in a single-copy implementation was up to 108 times compared with a single Intel processor cycle for cycle. The inherent scalability of our design allows for replication of this code into multiple FPGA cards and consequently improvements in speed are possible. Our results show the first embedded SCAPs prediction solution described and constitutes the grounds to efficiently perform the exhaustive analysis of the sequence-physicochemical properties relationship of peptides. © 2011 Polanco González et al.

Rocha-Rangel E.,Polytechnic University of Victoria | Miranda-Hernandez J.G.,Metropolitan Autonomous University
Materials Science Forum | Year: 2010

Through an intense mixing process of Al2O3 powder with different copper contents, Al2O3-Cu composites were fabricated by sintered at 1300°C during 1h, where the likely liquid sintering mechanism, lead to obtain composites with relative densities greater than 95%. Scanning electron microscopy was used to observe the resulting microstructures, which indicated that these composites were mostly formed by a fine and homogeneous Al2O3-ceramic matrix with immerse nano-metallic copper particles. The behavior of both fracture toughness and electrical resistance of the composites is directly dependent with the copper content in the matrix. As the copper contents increased, the composites exhibited high values of fracture toughness, whereas, their electrical resistance is reduced considerably. © (2010) Trans Tech Publications.

Torres-Huitzil C.,CINVESTAV | Delgadillo-Escobar M.,CINVESTAV | Nuno-Maganda M.,Polytechnic University of Victoria
IEICE Electronics Express | Year: 2012

Pseudorandom number generators (PRNGs) should satisfy two main criteria, high randomness quality and fast computation of a sequence of numbers. In this paper, a comparative study of twodimensional Cellular Automata (CA) based PRNGs is performed to evaluate the randomness quality and the hardware constraints involved in terms of configuration parameters such as, transition rules, neighborhoods and bit extraction schemes. Experimental results show that CA-based PRNGs present good randomness quality using standard test suites, and they are well suited for parallel implementations in Field Programmable Gate Array (FPGA) technology taking advantage of the on-chip fine-grain and distributed computational resources. © IEICE 2012.

Rocha-Rangel E.,Polytechnic University of Victoria | Martinez Alvarado M.J.,ESlQIE I. P. N. | Diaz-Cruz M.,ESlQIE I. P. N.
Ceramic Transactions | Year: 2012

In this work it was carried out a study about the hydration products formed by the activation with NaOH of granulated blast furnace slag at different temperatures (25, 50, 100 and 150°C), as a function of time (1, 3, 7, 14 and 28 days). The progress of hydration reactions was assessed by X-ray diffraction and infrared spectroscopy. From these analyses, they were found that the main product of hydration was the calcium silicate hydrate gel (CSH-gel), whose formation is favored with the increments of the temperature of hydration. Also, the hydrotalcite compound was formed in significant amounts for the different studied conditions. At high temperatures (100 and 150°C) they were formed in small amounts the compounds tobermorite and ettringite. Monosulphoaluminate and brucite phases were formed from 50°C. Results show the presence of calcite due to the absorption of atmospheric CO 2 by the slag. High amount of MgO in the slag provokes the formation of dolomite at high temperatures.

Torres-Huitzil C.,CINVESTAV | Nuno-Maganda M.,Polytechnic University of Victoria
2015 IEEE 6th Latin American Symposium on Circuits and Systems, LASCAS 2015 - Conference Proceedings | Year: 2015

Mobile artifacts such as smartphones have made possible the development of wearable systems for user activity monitoring and recognition due to the synergy of communication, computation and sensing capabilities in battery-powered systems-on-chip. Due to user acceptability, smartphones are able to measure nonintrusively proprioceptive motion outside of a controlled environment for rather long periods of time using embedded inertial sensors. Though work has been done for accelerometer-based activity recognition, the portability of the smartphone to a single fixed tight position has been a major constraint to easy the interpretation of the collected data. In this paper, a human activity hierarchical recognition system based on time-domain features and neural networks without the need of the smartphone to be constrained to a single fixed body position is presented. Experimental results on Android-capable smartphones on four on-body locations show that the recognition system achieves high classification rates, above 92%, for five activities including static, walking, running, and up-down stairs walking, running continuously in near real-time with reduced power consumption. © 2015 IEEE.

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