DEVELOPMENT OF A PORTABLE SEISMIC SOURCE FOR HIGH RESOLUTION SEISMIC ACQUISITION

One of the seismic energy sources most frequently used for shallow seismic data acquisition is the sledgehammer. However, the seismic pulse generated by the sledgehammer is not repeatable, it depends on the operating style of the person to use the sledgehammer. For a relative improvement in terms of increased penetration of waves elastic in the ground, to increase the signal - noise ratio, higher resolution vertical, the more impact energy, higher frequency content, and fewer of shots per site, the study reported here shows the design, building and testing of a device named GIS (Generador de Impacto Sísmico). Device testing was conducted by comparing the results obtained on the same seismic line with the GIS and the sledgehammer. It was concluded that seismic data obtained with the GIS provide higher resolution and research depth than that obtained with the sledgehammer, as the signal amplitude, signal - noise, penetration of acoustic waves in the subsoil and number of reflectors displayed was greater.   Keywords: Near-surface Seismology, Seismic source, Equipment, Impact energy.Una de las fuentes de energía sísmica más frecuentemente utilizadas para la adquisición de datos sísmicos someros es la porra o martillo grande. Sin embargo, el pulso sísmico generado por este tipo de fuentes no es repetible, pues depende del estilo de operación de la persona que maniobra el martillo. Para obtener una mejora relativa en términos de mayor penetración de ondas elásticas en el subsuelo, mayor relación señal-ruido, mayorresolución vertical, mayor energía de impacto, mayor contenido frecuencial y menor número de disparos por sitio, en el estudio aquí reportado, se diseñó, construyó y probó un equipo portátil Generador de ImpactosSísmicos (GIS). La validación del equipo se realizó comparando los resultados obtenidos sobre una misma línea sísmica con el equipo GIS y la porra. Se concluyó que los datos sísmicos obtenidos con el GIS brindan mayor resolución y profundidad que los obtenidos con porra, ya que la amplitud de la señal, relación señal ruido,penetración de las ondas acústicas en subsuelo y número de reflectores visualizados fue mayor. Palabras clave: Sismología somera, Fuente sísmica, Equipo, Energía de impacto &nbsp

DEVELOPMENT OF A PORTABLE SEISMIC SOURCE FOR HIGH RESOLUTION SEISMIC ACQUISITION

One of the seismic energy sources most frequently used for shallow seismic data acquisition is the sledgehammer. However, the seismic pulse generated by the sledgehammer is not repeatable, it depends on the operating style of the person to use the sledgehammer. For a relative improvement in terms of increased penetration of waves elastic in the ground, to increase the signal - noise ratio, higher resolution vertical, the more impact energy, higher frequency content, and fewer of shots per site, the study reported here shows the design, building and testing of a device named GIS (Generador de Impacto Sísmico). Device testing was conducted by comparing the results obtained on the same seismic line with the GIS and the sledgehammer. It was concluded that seismic data obtained with the GIS provide higher resolution and research depth than that obtained with the sledgehammer, as the signal amplitude, signal - noise, penetration of acoustic waves in the subsoil and number of reflectors displayed was greater.   Keywords: Near-surface Seismology, Seismic source, Equipment, Impact energy.Una de las fuentes de energía sísmica más frecuentemente utilizadas para la adquisición de datos sísmicos someros es la porra o martillo grande. Sin embargo, el pulso sísmico generado por este tipo de fuentes no es repetible, pues depende del estilo de operación de la persona que maniobra el martillo. Para obtener una mejora relativa en términos de mayor penetración de ondas elásticas en el subsuelo, mayor relación señal-ruido, mayorresolución vertical, mayor energía de impacto, mayor contenido frecuencial y menor número de disparos por sitio, en el estudio aquí reportado, se diseñó, construyó y probó un equipo portátil Generador de ImpactosSísmicos (GIS). La validación del equipo se realizó comparando los resultados obtenidos sobre una misma línea sísmica con el equipo GIS y la porra. Se concluyó que los datos sísmicos obtenidos con el GIS brindan mayor resolución y profundidad que los obtenidos con porra, ya que la amplitud de la señal, relación señal ruido,penetración de las ondas acústicas en subsuelo y número de reflectores visualizados fue mayor. Palabras clave: Sismología somera, Fuente sísmica, Equipo, Energía de impacto &nbsp

A Wearable System for Real-Time Continuous Monitoring of Physical Activity

Over the last decades, wearable systems have gained interest for monitoring of physiological variables, promoting health, and improving exercise adherence in different populations ranging from elite athletes to patients. In this paper, we present a wearable system for the continuous real-time monitoring of respiratory frequency (fR), heart rate (HR), and movement cadence during physical activity. The system has been experimentally tested in the laboratory (by simulating the breathing pattern with a mechanical ventilator) and by collecting data from one healthy volunteer. Results show the feasibility of the proposed device for real-time continuous monitoring of fR, HR, and movement cadence both in resting condition and during activity. Finally, different synchronization techniques have been investigated to enable simultaneous data collection from different wearable modules.Ministerio de Economía y Competitivida

Implementation of ARP-Path Low Latency Bridges in Linux and OpenFlow/NetFPGA

2011 IEEE 12th International Conference on High Performance Switching and Routing took place July 4-6, 2011 in Cartagena, Spain. This event web site is: http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=5976787This paper describes the implementation of ARPPath (a.k.a. FastPath) bridges, a recently proposed concept for low latency bridges, in Linux/Soekris and OpenFlow/NetFPGA platforms. These ARP-based Ethernet Switches rely on the race between the replicas of a standard ARP Request packet flooded over all links, to discover the minimum latency path to the destination host, complemented in the opposite direction by the ARP Reply packet directed to the source host. Implementations show that the protocol is loop free, does not block links, is fully transparent to hosts and neither needs a spanning tree protocol to prevent loops nor a link state protocol to obtain low latency paths. Implementations in Linux and OpenFlow on NetFPGA show inherent robustness and fast reconfiguration. Previous simulations showed a superior performance (throughput and delay) than the Spanning Tree Protocol and similar to shortest path routing, with lower complexityThis work was supported in part by grants from Comunidad de Madrid and Comunidad de Castilla la Mancha through Projects MEDIANET-CM (S-2009/TIC-1468), EMARECE (PII1I09-0204-4319) and T2C2(TIN2008-06739-C04-04).Publicad

A novel method for automatic detection and classification of movement patterns in short duration playing activities

Autonomous devices able to evaluate diverse situations without external help have become especially relevant in recent years because they can be used as an important source of relevant information about the activities performed by people (daily habits, sports performance, and health-related activities). Specifically, the use of this kind of device in childhood games might help in the early detection of developmental problems in children. In this paper, we propose a method for the detection and classification of movements performed with an object, based on an acceleration signal. This method can automatically generate patterns associated with a given movement using a set of reference signals, analyze sequences of acceleration trends, and classify the sequences according to the previously established patterns. This method has been implemented, and a series of experiments has been carried out using the data from a sensor-embedded toy. For the validation of the obtained results, we have, in parallel, developed two other classification systems based on popular techniques, i.e., a similarity search based on Euclidean distances and machine-learning techniques, specifically a support vector machine model. When comparing the results of each method, we show that our proposed method achieves a higher number of successes and higher accuracy in the detection and classification of isolated movement signals as well as in sequences of movements

Applying an unified access control for IoT-based Intelligent Agent Systems

IEEE 8th International Conference on Service-Oriented Computing and Applications (SOCA), 19/10/2015-21/10/2015, Roma, ItaliaThe rise of the Internet of Things (IoT) paradigm has allowed the design and development of new services interconnecting heterogeneous devices. However, the complexity of these new systems hasn"t been followed by the increase of intelligence and reasoning of the devices connected. On the other hand, intelligent agent systems have developed precisely these characteristics so the combination of both paradigms by modelling intelligent agents in IoT devices is a very promising approach that will enable a more powerful and smart IoT. The interconnection of agents through a Internet-based network implies addressing critical issues that affect all network communications, such as security, privacy and access control, specially given the sensitivity of the information exchanged by agents. In this paper, we propose the application of User-Managed Access (UMA) to provide an unified access control schema for an heterogeneous hybrid architecture of IoT devices and intelligent agents.Ministerio de Economía y Competitivida

Intelligent Traffic Light Management using Multi-Behavioral Agents

XIII Jornadas de Ingeniería Telemática, 27/09/2017-29/09/2017, Valencia, EspañaOne of the biggest challenges in modern societies is to solve vehicular traffic problems. In this scenario, our proposal is to use a Multi-Agent Systems (MAS) composed of three types of agent: traffic light management agents, traffic jam detection agents, and agents that control the traffic lights at an intersection. This third type of agent is able to change its behaviour between what we have called a selfish mode (the agent will try to influence the other neighbour agents of its type to achieve its goal) or an altruistic mode (the agent will take into consideration the other neighbour selfish agents indications). To validate our solution, we have developed a MAS emulator which communicates with the Simulation of Urban MObility (SUMO) traffic simulator using the Traci tool to realize the experiments in a realistic environment. The obtained results show that our proposal is able to improve other existing solutions such as conventional traffic light management systems (static or dynamic) in terms of reduction of vehicle trip duration

Access Control Mechanism for IoT Environments Based on Modelling Communication Procedures as Resources

Internet growth has generated new types of services where the use of sensors and actuators is especially remarkable. These services compose what is known as the Internet of Things (IoT). One of the biggest current challenges is obtaining a safe and easy access control scheme for the data managed in these services. We propose integrating IoT devices in an access control system designed for Web-based services by modelling certain IoT communication elements as resources. This would allow us to obtain a unified access control scheme between heterogeneous devices (IoT devices, Internet-based services, etc.). To achieve this, we have analysed the most relevant communication protocols for these kinds of environments and then we have proposed a methodology which allows the modelling of communication actions as resources. Then, we can protect these resources using access control mechanisms. The validation of our proposal has been carried out by selecting a communication protocol based on message exchange, specifically Message Queuing Telemetry Transport (MQTT). As an access control scheme, we have selected User-Managed Access (UMA), an existing Open Authorization (OAuth) 2.0 profile originally developed for the protection of Internet services. We have performed tests focused on validating the proposed solution in terms of the correctness of the access control system. Finally, we have evaluated the energy consumption overhead when using our proposal.Ministerio de Economía y CompetitividadUniversidad de Alcal

COVID-19 anxiety, psychological well-being and preventive behaviors during the COVID-19 pandemic in Latin America and the Caribbean: relationships and explanatory model

This study assesses the relationship between COVID-19 anxiety and subjective well-being in terms of the mediating role of COVID-19 preventive behaviors. Additionally, the contribution of sociodemographic factors (sex and age) and risk perception on COVID-19 anxiety and its potential measurement invariance was tested in 5655 participants from 12 countries in Latin America and the Caribbean. A mixture of both latent and observable variables were analyzed using a system of structural equations. The Coronavirus Anxiety Scale (CAS), Preventive COVID-19 Infection Behaviors Scale (PCIBS) and single-item measures were used to assess the perceived probability of death, perceived severity and concern about transmitting COVID-19. The results indicated that there is a significant and relevant direct effect of COVID-19 anxiety on participants' well-being. Furthermore, COVID-19 anxiety significantly predicted both preventive behavior (β = .29, p < .01) and well-being (β = –.32, p < .01). The effects of COVID anxiety and preventive behavior explained 9.8% of the variance in well-being (R-square = .098); whereas, 8.4% of the variance in preventive behavior was associated with COVID anxiety (R-square = .084). Likewise, perceived likelihood of death from COVID, perceived severity of COVID, and concerns about COVID transmission were positively related to anxiety. Age was negatively related to anxiety, with men being less anxious than women. The results are invariant by country, i.e., the broad relationships found in the combined sample are also present in each individual country. The findings indicate that, although the exact relationships between variables may vary between countries, there are enough similarities to provide useful information about the impact of the COVID-19 pandemic in each of the countries included in the study

What Is the Support for Conspiracy Beliefs About COVID-19 Vaccines in Latin America? A Prospective Exploratory Study in 13 Countries

Conspiracy theories about COVID-19 began to emerge immediately after the first news about the disease and threaten to prolong the negative impact of the COVID-19 pandemic by limiting people’s willingness of receiving a life-saving vaccine. In this context, this study aimed to explore the variation of conspiracy beliefs regarding COVID-19 and the vaccine against it in 5779 people living in 13 Latin American countries (Argentina, Bolivia, Chile, Colombia, Cuba, Ecuador, El Salvador, Guatemala, Mexico, Paraguay, Peru, Uruguay and Venezuela) according to sociodemographic variables such as gender, age, educational level and source of information about COVID-19. The study was conducted during the COVID-19 pandemic between September 15 and October 25, 2021. The Spanish-language COVID-19 Vaccine Conspiracy Beliefs Scale (ECCV-COVID) and a sociodemographic survey were used. The results indicate that, in most countries, women, people with a lower educational level and those who receive information about the vaccine and COVID-19 from family/friends are more supportive of conspiracy ideas regarding the COVID-19 vaccine. In the case of age, the results vary by country. The analysis of the responses to each of the questions of the ECCV-COVID reveals that, in general, the countries evaluated are mostly in some degree of disagreement or indecision regarding conspiratorial beliefs about COVID-19 vaccines. The findings could help open further study which could support prevention and treatment efforts during the COVID-19 pandemic