Recognition of handwritten digits by image processing methods and classification models

OCR (Optical Character Recognition) is a line of research within image processing for which many techniques and methodologies have been developed. Set of pixels recognized based on the digitalized image and this study presents an iterative process that consists of five phases of the OCR. For this purpose, several image processing methods are applied, as well as two variable selection methods, and several supervised automated learning methods are explored. Among the classification models, those of deep learning stand out for their novelty and enormous potential

¿Por qué las y los jóvenes de Tunjuelito no participan en el programa de juventud de la secretaría distrital de integración social?

En este estudio exploratorio abordaremos el tema de la participación juvenil, donde se describe desde varias perspectivas, tanto en lo teórico como en lo práctico, la percepción que tiene la juventud de la institución gubernamental y viceversa. Sobre la base de una experiencia vivida, se investiga de forma cualitativa el porqué no participan los/las jóvenes de la localidad de Tunjuelito en los programas de la Secretaría Distrital de Integración Social, identificando el contexto y las diversas causas que impiden la participación activa de la juventud, para comprender un poco más el accionar de los mismos. En el presente documento se relaciona la participación con el interaccionismo simbólico y la teoría de la acción

¿Por qué las y los jóvenes de Tunjuelito no participan en el programa de juventud de la secretaría distrital de integración social?

En este estudio exploratorio abordaremos el tema de la participación juvenil, donde se describe desde varias perspectivas, tanto en lo teórico como en lo práctico, la percepción que tiene la juventud de la institución gubernamental y viceversa. Sobre la base de una experiencia vivida, se investiga de forma cualitativa el porqué no participan los/las jóvenes de la localidad de Tunjuelito en los programas de la Secretaría Distrital de Integración Social, identificando el contexto y las diversas causas que impiden la participación activa de la juventud, para comprender un poco más el accionar de los mismos. En el presente documento se relaciona la participación con el interaccionismo simbólico y la teoría de la acción

Effect of Spatiotemporal Parameters on the Gait of Children Aged from 6 to 12 Years in Podiatric Tests: A Cross Sectional Study

The use of lower limb tests in the paediatric population is of great importance for diagnostic evaluations. The aim of this study is to understand the relationship between the tests performed on the feet and ankles, covering all of its planes, and the spatiotemporal parameters of children’s gait. Methods: It is a cross-sectional observational study. Children aged between 6 and 12 years participated. Measurements were carried out in 2022. An analysis of three tests used to assess the feet and ankles (FPI, the ankle lunge test, and the lunge test), as well as a kinematic analysis of gait using OptoGait as a measurement tool, was performed. Results: The spatiotemporal parameters show how Jack’s Test is significant in the propulsion phase in its % parameter, with a p-value of 0.05 and a mean difference of 0.67%. Additionally, in the lunge test, we studied the % of midstance in the left foot, with a mean difference between the positive test and the 10 cm test of 10.76 (p value of 0.04). Conclusions: The diagnostic analysis of the functional limitation of the first toe (Jack’s test) is correlated with the spaciotemporal parameter of propulsion, as well as the lunge test, which is also correlated with the midstance phase of gait.Funding for open access charge: Universidad de Málag

Design of an exoskeleton for upper limb robot-assisted rehabilitation based on co-simulation

This paper presents the design and the simulation of an exoskeleton based on the kinematics of the human arm intended to be used in robot-assisted rehabilitation of the upper limb. The design meets the kinematic characteristics of the human arm so that the exoskeleton allows the movement of the arm in its full range of motion. We used co-simulation to design the exoskeleton considering a model of the upper limb developed in Opensim, Solidworks to design the mechanical structure and Matlab to construct the dynamic model. The system in motion was simulated in Simmechanics using predictive dynamics to compute independent joint trajectories obtained by modelling the exoskeleton as several optimization problems solved with SNOPT from Tomlab. The use of virtual tools in the designing process and the modular structure of the exoskeleton will allow the construction of personalized devices using 3D printing. The exoskeleton was designed to work under independent joint control so that the system will be able to work as passive, assistive and active-assistive mode, to keep records of motion for data analysis and to support the rehabilitation process

A Coherent Multiple Beamforming Network for a Non-uniform Circular Antenna Array

This work proposes and describes a modular and innovative beamforming network (BFN) to feed a nonequally spaced circular antenna array. The structure is based on a set of alternated power combiners and dividers that delivers a Gaussian-like amplitude distribution and coherent (in-phase) signals. A multiple beam antenna system to generate two main beams in the same aperture with a coherent network for a nonuniform array with beam shaping and beam steering properties is simulated and analyzed. Furthermore, a comparative analysis based on uniform and nonuniform circular antenna arrays fed by the proposed coherent network is conducted. The complex signals and the nonuniform circular aperture are optimized using the well known differential evolution technique. Numerical experiments show the efficiency and improvement of the coherent network with a nonuniform aperture over uniform, with an advantage in average equal to 1.8dB of directivity and -2dB of side lobe level. Moreover, the simulation results exhibit an aperture reuse and complexity reduction of the proposed coherent network configuration compared with a conventional antenna array with direct feeding, where each main beam is shaped and steered with the half of control signal inputs

Ocupación espectral de la banda ISM de 2.4 GHz para aplicaciones de radio cognoscitivo

La tecnología de radio cognoscitivo representa una prometedora solución al problema de escasez de espectro electromagnético, dado que una gran parte del espectro asignado se utiliza de forma esporádica, existiendo una subutilización del mismo. En la banda industrial, científica y médica (ISM, por sus siglas en inglés) de 2.4 GHz, varias campañas de mediciones se han realizado para determinar la ocupación real del espectro. En este trabajo se describe una metodología para obtener la ocupación espectral de la banda ISM de 2.4 GHz, en las instalaciones de la Facultad de Ciencias en la Universidad Autónoma de San Luis Potosí. Se presentan los resultados de la densidad espectral de potencia y el ciclo de trabajo. Estos resultados indican claramente que la utilización del espectro es baja, a pesar de que muchas tecnologías de comunicación inalámbrica comparten este recurso.Palabras Claves: banda ISM, ciclo de trabajo, ocupación espectral, radio cognoscitivo

A portable elbow exoskeleton for three stages of rehabilitation

Patients suffering from stroke need to undergo a standard and intensive rehabilitation therapy. The rehabilitation training consists of three sequential stages: the first stage is controlled joint movement under external actuator, the second stage deals with supporting the movements by providing assistive force, and the last stage provides variety and difficulty to exercises. Most of the exoskeletons developed so far for rehabilitation are restricted to a particular type of activity. Although a few exoskeletons incorporate different modes of rehabilitation, those are software controlled requiring sensory data acquisition and complex control architecture. To bridge this gap, a portable elbow exoskeleton has been developed for delivering three stages of rehabilitation in a single structure without affecting the range of motion and safety features. Use of electric motor and springs have been arranged in the actuation mechanism to minimize the energy consumption. The developed exoskeleton enhances torque to weight ratio compared to existing models, and all the three modes of rehabilitation have been controlled using a single motor