DNA sequences in human genome can be divided into the coding and noncoding ones. We hypothesize that the characteristic periodicities of the noncoding sequences are related to their function. We describe the procedure to identify these characteristic periodicities using the wavelet analysis. Our results show that three groups of noncoding sequences, each one with different biological function, may be differentiated by their wavelet coefficients within specific frequency range.

Coding region

Complementary sequences

10.1117/12.2286556

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Optical inspection for electronic assemblies using nonlinear correlation filters

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2008)

Jorge L. Flores Guillermo García–Torales Josué Álvarez-Borrego

This paper describes an image recognition system designed to inspect the standards quality of electronic assemblies. The essence of the present algorithm is the location of electronics components, at the input image, that disrupt the acceptance requirements for the manufacture of printed circuit board assemblies, which have been adopted by association connecting electronics industries. To this end, image processing modules, based on a nonlinear composite filter are employed with the objective to discriminate between the electronics components that meet the acceptance condition and those that are in defect condition. The proposed recognition system is based on nonlinear composite filter, which is obtained from a training set of reference images. Then, the optimal filter is used in a digital correlator, which results in a simple and robust inspection system.

Electronic component

Composite image filter

10.1117/12.795597

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Low-power device for wireless sensor network for Smart Cities

César Abelardo González-Ramírez Roberto Carlos Barragán Campos Guillermo García–Torales Víctor M. Larios

Nowadays, Wireless Sensor Networks (WSN) provide new monitoring capabilities useful in the different dimensions of Smart Cities to gather information in environment, healthcare, transport, logistics and security applications. However, wireless communication frequently requires a high power consumption which reduces the autonomy of the system. In this paper, we propose the implementation of a WSN using low-power devices for the transceiver process. This system combines sensing and data storage in a compact device with low power consumption. One device is a wireless node sensor, and the other device consists in a data storage component. The wireless network made a connection by multichannel RF communication operating at 315, 433, 868, and 915 MHz, Data storage device used a Real Time Clock (RTC) and external memory (EEPROM) to register sensor measurements. Overall system lets improve the data management using both, storage and transmission data.

Sensor node

Fixed wireless

Transceiver

10.1109/lamc.2016.7851298

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Citations (17)

Retardance polarization measurement based on a dual rotating polarizer arrangement

Gelizlte A. Parra-Escamilla David I. Serrano-García Jorge Luis Flores Nuñez Guillermo García–Torales Antonio Muñoz

We present a polarization sensitive measurement focused on retrieve elliptical phase retardation properties. The system is based on rotating two linear polarizers. And a demodulation algorithm is proposed to retrieve a partial matrix of Muller from the intensity output signal. The polarimetry setup also employs a monochrome camera as detection system and a HeNe laser as light source. Simulation and experimental results in transparent samples are presented showing the feasibility of the measurement and the potential usage in a multiwavelength arrangement.

Polarizer

Monochrome

Dual-polarization interferometry

10.1117/12.2321676

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Intelligent neural computing-based way for multi-sensor imaging radar data fusion

Yuriy V. Shkvarko Josue A. Lopez Stewart R. Santos Guillermo García–Torales

We address and compare two new frameworks for neural network (NN) computing-based feature enhanced (FE) fusion of remote sensing (RS) imagery acquired with different coherent radar sensing modalities. Both approaches exploit aggregation of the descriptive experiment design regularization (DEDR) based and the theoretical informatics inspired maximum entropy (ME) regularization paradigms for iterative minimization of the energy function (EF) of the multistate MENN with adaptive adjustments of the NN's synaptic weights and bias inputs. Two distinct ways employed for the construction and minimization of the NNs' EFs specify two corresponding different fusion frameworks addressed as the DEDR-MENN ⁽¹⁾ and the DEDR-MENN ⁽²⁾ techniques, respectively. The DEDR-MENN ⁽¹⁾ framework is based on the weighted aggregation of the individual fused sensor's objective functions, while the DEDR-MEN ⁽²⁾ performs the FE fusion employing the theoretical informatics inspired unified model-based MENN framework. We compare the computational implementation and performance issues of both addressed methods and feature through computer simulations with the real-world radar imagery the superior operational performances attained with the DEDR-MENN ⁽²⁾ approach.

Sensor Fusion

Minification

10.1109/icpr.2016.7899726

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Design and development of multi-sensor based on all fiber NXN twisted plastic optical fiber

José Luis de la Cruz-González Iván Ramírez-Águila H. Santiago-Hernández Manuel Salvador Beethoven Bravo Medina Azael de Jesús Mora Nuñez

A 3X3 plastic optical fiber (POF) twisted coupler has been fabricated as a compact sensor of multiple variables. The POFs are twisted into a combined body and the clad was removed by chemical method. Three LEDs of red, green, and blue colors can be used to shape a broad spectrum. Each led was connected at a different input port of the coupler. Since the twisted coupler makes the coupling of light from the input ports, we have a wide spectrum at each one output port. We develop a different sensor at each one output coupler: mass concentration (At the output-1), and curvature (At the output-2). The multi-sensing proposed in this work can increase the number of sensors as increase the number of output ports, and the bandwidth increase as increase the colors of light sources. On the other hand, we can use a wide spectrum lamp in a single input port and in the same way make multiple sensors in the output ports. The variation is evident in all wavelengths of the spectrum for measurements of sugar concentrations and fiber curvature. However, we can directly associate the sugar concentration variations with the spectrum in a range from 570 to 600 nm; and across the full spectrum for curvature measurements.

Port (circuit theory)

10.1117/12.2594038

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Color-fringe pattern profilometry using an efficient iterative algorithm

Optics Communications (2017)

Jorge L. Flores Antonio Muñoz Sotero Ordoñes Guillermo García–Torales José A. Ferrari

Normalization

Colored

Modulation (music)

Structured-light 3D scanner

Phase Unwrapping

10.1016/j.optcom.2016.12.058

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Vectorial shearing interferometer with a high resolution phase shifter

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2007)

Guillermo García–Torales Jorge L. Flores

Vectorial shearing interferometer has been used to measure small and large non-rotationally symmetrical wavefronts aberrations. This interferometric system encompasses large and differential wavefront displacements using a high accuracy rotation system incorporated in a Mach-Zehnder interferometer. The rotation system is based on the Risley prism arrangement and it is controlled with an electronic servomotor system by means of an auto-tuning algorithm. We present the servo-mechanical system, electronic interface and algorithms to control the performance of the high resolution rotation device that is used to control the wavefront phase shifting.

Shearing interferometer

Shearing (physics)

Phase shift module

Wavefront sensor

Servomechanism

10.1117/12.783378

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Citations (2)