Marcelo Herrera Martínez

• PhD
• Professor (Full) at San Buenaventura University

El Trastorno por Déficit de Atención e Hiperactividad (TDAH) tiene una prevalencia estimada del 5.3% en la población mundial; su diagnóstico se basa en evaluaciones clínicas, conductuales y resultados de pruebas psicométricas. Recientemente el Aprendizaje de Máquinas (AM) se ha empleado para detectar diversas condiciones neuropsiquiátricas, brindan...

The recent emergence of advanced information technologies such as cloud computing, artificial intelligence, and data science has improved and optimized various processes in acoustics with potential real-world applications. Noise monitoring tasks on large terrains can be captured using an array of sound level meters. However, current monitoring syst...

Soundscapes represents the way in which people perceive and experiment the sounds of a particular acoustic environment. In this paper we explain the procedure carried up to develop a Mobile App for the evaluation of soundscapes in the case of Spanish speakers and its validation through principal component analysis. The application (called “SSEBOG”)...

Lowering pollution levels is one of the main principles of Sustainable Development goals dictated by the United Nations. Consequently, developments on noise monitoring contribute in great manner to this purpose, since they give the opportunity to governments and institutions to maintain track on the matter. While developing a software product for t...

The present paper initially presents to the reader the most prominent results in the field of SSD (Sensory Substitution Devices) for the visually impaired population. Afterwards, a technical-ergonomic comparison is held, where some important academic and commercial projects in the last decade are highlighted. Several transcendental discoveries in t...

Communication and Information technologies have optimized several processes of our daily life. Environmental Acoustics has also benefited from this progress with technological tools that have enabled the digitization of data representing noise polluted zones in the world. For this purpose, georeferentiation procedures and noise mapping strategies h...

http://www.editorialbonaventuriana.usb.edu.co/index.php/libros/inv/item/7-ingenieria/519-smart-cities-y-acustica-sostenible

In this document are revised different control techniques applied to distributed generation systems, including control of active-reactive power, load-frequency control and the identification and control of island mode operation of the generation units, which are the main themes identified. The different control strategies identified are PID, robust...

A perforated panel from guadua fibres is implemented after acoustic characterization of the fibres. The acoustic characteristics of the fibre are identified and further, the acoustic behaviour of the acoustic absorption system made from guadua is analysed. It proves the suitability of natural fibres and bioresidues for systems which goal is to brin...

The growing demand for building materials requires the development of environmentally friendly materials with excellent use properties and reasonable prices. One of the major objectives of materials research in the construction industry is the use of renewable resources from waste materials from industries for the development of new building materi...

En los servicios de transporte público actuales no existen sistemas de información multimodal que permitan guiar a los usuarios de manera fácil y accesible. Por tal razón, en la Universidad EL Bosque, en convenio con la Universidad de San Buenaventura se está desarrollando un proyecto de investigación que busca identificar a profundidad las necesid...

This paper presents experiences in a project proposal that is about the development of a digital platform, which articulates the local environments of some universities in Bogotá city. The project will be carried out in conjunction with the community, contributing to the construction of tools, which enable the implementation of technologies dedicat...

The present research is about the practical implementation of a perforated panel for acoustic conditioning, manufactured with guadua, a typical Colombian fiber. The developed panel is checked for its acoustic conditioning properties. Guadua is an attractive natural resource with great potential for renovation and use in sustainable construction. He...

The growing demand for building materials requires the development of environmentally friendly materials with excellent use properties and reasonable prices. One of the major objectives of materials research in the construction industry is the use of renewable resources from waste materials from industries for the development of new building materi...

Electronic travel aids (ETAs) have been in focus since technology allowed designing relatively small, light, and mobile devices for assisting the visually impaired. Since visually impaired persons rely on spatial audio cues as their primary sense of orientation, providing an accurate virtual auditory representation of the environment is essential....

Translating visual representations of real environments into auditory feedback is one of the key challenges in the design of an electronic travel aid for visually impaired persons. Although the solutions currently available in the literature can lead to effective sensory substitution, high commitment to an extensive training program involving repet...

In this paper, audio perceptual compression systems are described, giving special attention to the former one: The MPEG 1, Layer III, in short, the MP3. Other compression technologies are described, especially the technologies evaluated in the present work: OGG Vorbis, WMA (Windows Media Audio) from Microsoft Corporation and AAC (Audio Coding Techn...

p> El presente trabajo se enfoca en la evaluación psicoacústica subjetiva de algunas tecnologías de codificación de audio con un conjunto de métodos psicométricos. Las partes clave de la implementación de los pruebas son la selección adecuada de señales críticas, metodologías de evaluación y personas-escucha, para poder realizar un test efectivo. B...

p> RESUMEN El siguiente documento describe el desarrollo de un software de análisis de parámetros acústicos de la voz (APAVOIX), que puede ser utilizado con énfasis en acústica forense, basado en el reconocimiento e identificación de hablantes. Este software permite observar de manera clara los parámetros de la voz suficientes y necesarios en el m...

The present paper describes the development of a software for analysis of acoustic voice parameters (APAVOIX), which can be used for forensic acoustic purposes, based on the speaker recognition and identifi cation. This software enables to observe in a clear manner, the parameters which are suffi cient and necessary when performing a comparison bet...

This project deals with the implementation of an algorithm for frequency band displacement for the optimization of acoustic boxes. This is particularly relevant in the Car-audio industry and similar applications, when limitations of volume and space are present. The work gives an alternative solution to the problem of huge acoustic boxes sizes for...

Electroacoustic analogies are physical modelling tools that enable the characterization of mechanical and acoustic systems. In this case, the human lung system can be characterized by this method, enabling the diagnostic and evaluation of their performance.

p>Este trabajo describe el desarrollo de un sistema, el cual puede ser usado para latransmisión de señales acústicas a través de conducción ósea, con el objetivo de recuperar y/o ampliar la audibilidad en personas con deficiencias o limitaciones auditivas. El prototipo permite recuperar la capacidad auditiva con un método no- convencional.</p

In this paper, the impact of the degree of compression by High Efficiency Video Coding (HEVC) on observers ability of detecting certain events in videos obtained by outdoor CCTV cameras is studied. This was done by extensive subjective testing. The testing was performed also for H.264/MPEG-4 Part 10 AVC compression on similar bitrates and the capab...

The following document describes the use of the acoustic reflectometry, the theory that follows it, and its implementation as a technique to measure cylindrical pipes. It describes how it was constructed and the materials used in the construction and implementation of the system that allows capturing signals (reflections) from the pipe under evalua...

The present project is motivated by the necessity of analyzing the technique of OFDM modulation and its performance, focused to the Transmission of Digital Radio. Traditionally all the radio programs are transmitted by FM, and AM modulations, and the radio should be tuned to each one of these frequencies; this used a wide range of the spectrum for...

p class="MsoNormal" style="margin: 0cm 0cm 6pt; text-align: justify; line-height: normal; tab-stops: 35.4pt; mso-outline-level: 3;"> La ansiedad es uno de los principales problemas de las sociedades modernas. La sobre-activación de un organismo a un estímulo en particular, genera una reacción en cadena, que altera la cotidianidad del individuo, y l...

p class="MsoBodyTextIndent" style="margin: 0cm 0cm 6pt; text-align: justify; line-height: 150%;"> El presente artículo describe una serie de procedimientos y resultados que fueron obtenidos durante los últimos dos años en la evaluación subjectiva de audio-codecs. El método de testeo usado fue el “Método de Doble estímulo con referencia escondida”....

This paper deals with subjective evaluation of audio-coding systems. From this evaluation, it is found that, depending on the type of signal and the algorithm of the audio-coding system, different types of audible errors arise. These errors are called coding artifacts. Although three kinds of artifacts are perceivable in the auditory domain, the au...

This paper deals with methods for subjective evaluation of signals compressed by various types of sound codecs. In ITU recommendations double blind triple stimulus method for evaluation purposes is suggested. The proposed paper compares results obtained from this ITU recommended method and the method where no original, i.e. undistorted signal is us...