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Santiago Felici-Castell received M.Sc. and Ph.D. degrees in telecommunication engineering from the Polytechnical University of Valencia, Valencia, Spain, in 1993 and 1998, respectively. He is currently an Associate Professor with the University of Valencia. He is also a Cisco Systems Certificated Instructor, and has authored over 40 technical papers in international journals and conferences. His current research interests include networking, communication systems, and multiresolution techniques for data transmission with quality of service
In recent years, Wireless Acoustic Sensor Networks (WASN) have been widely applied to different acoustic fields in outdoor and indoor environments. Most of these applications are oriented to locate or identify sources and measure specific features of the environment involved. In this paper, we study the application of a WASN for room acoustic measurements. To evaluate the acoustic characteristics, a set of Raspberry Pi 3 (RPi) has been used. One is used to play different acoustic signals and four are used to record at different points in the room simultaneously. The signals are sent wirelessly to a computer connected to a server, where using MATLAB we calculate both the impulse response (IR), and different acoustic parameters, such as the Speech Intelligibility Index (SII). In this way, the evaluation of room acoustic parameters with asynchronous IR measurements two different applications has been explored. Finally, the network features have been evaluated to assess the effectiveness of this system.
Jesus Lopez-Ballester; Jose Alcaraz Calero; Jaume Segura-Garcia; Santiago Felici-Castell; Miguel Garcia-Pineda; Maximo Cobos. Speech Intelligibility Analysis and Approximation to Room Parameters through the Internet of Things. Applied Sciences 2021, 11, 1430 .
AMA StyleJesus Lopez-Ballester, Jose Alcaraz Calero, Jaume Segura-Garcia, Santiago Felici-Castell, Miguel Garcia-Pineda, Maximo Cobos. Speech Intelligibility Analysis and Approximation to Room Parameters through the Internet of Things. Applied Sciences. 2021; 11 (4):1430.
Chicago/Turabian StyleJesus Lopez-Ballester; Jose Alcaraz Calero; Jaume Segura-Garcia; Santiago Felici-Castell; Miguel Garcia-Pineda; Maximo Cobos. 2021. "Speech Intelligibility Analysis and Approximation to Room Parameters through the Internet of Things." Applied Sciences 11, no. 4: 1430.
In the last decade there has been an increasing interest and demand on the Internet of Things (IoT) and its applications. But, when a high level of computing and/or real time processing is required for these applications, different problems arise due to their requirements. In this context, low cost autonomous and distributed Small Board Computers (SBC) devices, with processing, storage capabilities and wireless communications can assist these IoT networks. Usually, these SBC devices run an operating system based on Linux. In this scenario, container-based technologies and fog computing are an interesting approach and both have led to a new paradigm in how devices cooperate, improving overall capacity in a cluster of these SBC devices. The use of containers is considered a lightweight virtualization, allowing an application to be broken into small tasks as services, enabling load balancing, flexibility and scalability. Nevertheless when the number of devices and containers increases in the cluster, it is required an orchestration layer. There are not many solutions and available alternatives using these technologies applied on these networks, and less an assessment of their performances. This paper focuses on these technologies when we use fog computing with low cost SBC devices in a context of IoT. We use Linux containers and different available orchestration platforms (in particular Docker Swarm and Kubernetes), to run on the top of the cluster of commercial SBC devices. Thus, we carry out a thorough functional and performance comparison with different real topologies (wired and wireless) and using both homogeneous and heterogeneous clusters of SBC devices, showing their results. We conclude that with the collected experimental results, Docker Swarm orchestration platform outperforms its counterparts in the scenarios shown.
Rafael Fayos-Jordan; Santiago Felici-Castell; Jaume Segura-Garcia; Jesus Lopez-Ballester; Maximo Cobos. Performance comparison of container orchestration platforms with low cost devices in the fog, assisting Internet of Things applications. Journal of Network and Computer Applications 2020, 169, 102788 .
AMA StyleRafael Fayos-Jordan, Santiago Felici-Castell, Jaume Segura-Garcia, Jesus Lopez-Ballester, Maximo Cobos. Performance comparison of container orchestration platforms with low cost devices in the fog, assisting Internet of Things applications. Journal of Network and Computer Applications. 2020; 169 ():102788.
Chicago/Turabian StyleRafael Fayos-Jordan; Santiago Felici-Castell; Jaume Segura-Garcia; Jesus Lopez-Ballester; Maximo Cobos. 2020. "Performance comparison of container orchestration platforms with low cost devices in the fog, assisting Internet of Things applications." Journal of Network and Computer Applications 169, no. : 102788.
Sensor networks have become an extremely useful tool for monitoring and analysing many aspects of our daily lives. Noise pollution levels are very important today, especially in cities where the number of inhabitants and disturbing sounds are constantly increasing. Psycho-acoustic parameters are a fundamental tool for assessing the degree of discomfort produced by different sounds and, combined with wireless acoustic sensor networks (WASNs), could enable, for example, the efficient implementation of acoustic discomfort maps within smart cities. However, the continuous monitoring of psycho-acoustic parameters to create time-dependent discomfort maps requires a high computational demand that prevents real-time computations within the nodes. Moreover, sending audio streams outside of the WASN for their further computation, would require extra communication and computational efforts without warranting a real-time monitoring, with the added problem of violating some privacy laws. As a result, most existing systems for nuisance assessment are usually based on less accurate indicators that require lower computational cost. In this paper, we describe the design and analysis of a deep convolutional neural network (CNN) trained with a big dataset of typical sounds occurrying in a city. The CNN allows to predict the psycho-acoustic parameters considered by the well-known Zwicker’s psycho-acoustic nuisance model with great accuracy, directly from the raw recorded audio signal. The proposed CNN-based system has been tested on both desktop computers and typical WASN devices (such as Raspberry Pi), achieving very fast calculation times that allow real-time operation and a continuous monitoring of psycho-acoustic parameters.
Jesus Lopez-Ballester; Adolfo Pastor-Aparicio; Santiago Felici-Castell; Jaume Segura-Garcia; Maximo Cobos. Enabling Real-Time Computation of Psycho-Acoustic Parameters in Acoustic Sensors Using Convolutional Neural Networks. IEEE Sensors Journal 2020, 20, 11429 -11438.
AMA StyleJesus Lopez-Ballester, Adolfo Pastor-Aparicio, Santiago Felici-Castell, Jaume Segura-Garcia, Maximo Cobos. Enabling Real-Time Computation of Psycho-Acoustic Parameters in Acoustic Sensors Using Convolutional Neural Networks. IEEE Sensors Journal. 2020; 20 (19):11429-11438.
Chicago/Turabian StyleJesus Lopez-Ballester; Adolfo Pastor-Aparicio; Santiago Felici-Castell; Jaume Segura-Garcia; Maximo Cobos. 2020. "Enabling Real-Time Computation of Psycho-Acoustic Parameters in Acoustic Sensors Using Convolutional Neural Networks." IEEE Sensors Journal 20, no. 19: 11429-11438.
Lightning and thunder are some of the most violent natural phenomena. They generate a great deal of expenditure and economic loss, especially when they strike in cities. The identification of the concrete geographic area where they strike is of critical importance for emergency services in order to enhance their effectiveness by doing an intensive coverage of the affected area. To achieve this purpose at the city scale, this paper proposes the design, prototype, and validation of a distributed network of Internet of Things (IoT) devices. The IoT devices are empowered with lightning detection capabilities and are synchronized with the other devices in the sensor network. All of them cooperate within a network that is able to locate different events thanks to a trilateration algorithm implemented in a big data environment. The designed low-cost lightning detection system is based on the AS3935 sensor. This system alone has a limited range of effective detection, but when it is embedded in an IoT mesh network, the accuracy and performance are increased. A fully operational IoT network was deployed, and a functional validation and empirical measurements are provided.
Ismael Mialdea-Flor; Jaume Segura-Garcia; Santiago Felici-Castell; Miguel Garcia-Pineda; Jose M. Alcaraz-Calero; Enrique Navarro-Camba. Development of a Low-Cost IoT System for Lightning Strike Detection and Location. Electronics 2019, 8, 1512 .
AMA StyleIsmael Mialdea-Flor, Jaume Segura-Garcia, Santiago Felici-Castell, Miguel Garcia-Pineda, Jose M. Alcaraz-Calero, Enrique Navarro-Camba. Development of a Low-Cost IoT System for Lightning Strike Detection and Location. Electronics. 2019; 8 (12):1512.
Chicago/Turabian StyleIsmael Mialdea-Flor; Jaume Segura-Garcia; Santiago Felici-Castell; Miguel Garcia-Pineda; Jose M. Alcaraz-Calero; Enrique Navarro-Camba. 2019. "Development of a Low-Cost IoT System for Lightning Strike Detection and Location." Electronics 8, no. 12: 1512.
The Internet of Things (IoT) is a network widely used with the purpose of connecting almost everything, everywhere to the Internet. To cope with this goal, low cost nodes are being used; otherwise, it would be very expensive to expand so fast. These networks are set up with small distributed devices (nodes) that have a power supply, processing unit, memory, sensors, and wireless communications. In the market, we can find different alternatives for these devices, such as small board computers (SBCs), e.g., Raspberry Pi (RPi)), with different features. Usually these devices run a coarse version of a Linux operating system. Nevertheless, there are many scenarios that require enhanced computational power that these nodes alone are unable to provide. In this context, we need to introduce a kind of collaboration among the devices to overcome their constraints. We based our solution in a combination of clustering techniques (building a mesh network using their wireless capabilities); at the same time we try to orchestrate the resources in order to improve their processing capabilities in an elastic computing fashion. This paradigm is called fog computing on IoT. We propose in this paper the use of cloud computing technologies, such as Linux containers, based on Docker, and a container orchestration platform (COP) to run on the top of a cluster of these nodes, but adapted to the fog computing paradigm. Notice that these technologies are open source and developed for Linux operating system. As an example, in our results we show an IoT application for soundscape monitoring as a proof of concept that it will allow us to compare different alternatives in its design and implementation; in particular, with regard to the COP selection, between Docker Swarm and Kubernetes. We conclude that using and combining these techniques, we can improve the overall computation capabilities of these IoT nodes within a fog computing paradigm.
Rafael Fayos-Jordan; Santiago Felici-Castell; Jaume Segura-Garcia; Adolfo Pastor-Aparicio; Jesus Lopez-Ballester. Elastic Computing in the Fog on Internet of Things to Improve the Performance of Low Cost Nodes. Electronics 2019, 8, 1489 .
AMA StyleRafael Fayos-Jordan, Santiago Felici-Castell, Jaume Segura-Garcia, Adolfo Pastor-Aparicio, Jesus Lopez-Ballester. Elastic Computing in the Fog on Internet of Things to Improve the Performance of Low Cost Nodes. Electronics. 2019; 8 (12):1489.
Chicago/Turabian StyleRafael Fayos-Jordan; Santiago Felici-Castell; Jaume Segura-Garcia; Adolfo Pastor-Aparicio; Jesus Lopez-Ballester. 2019. "Elastic Computing in the Fog on Internet of Things to Improve the Performance of Low Cost Nodes." Electronics 8, no. 12: 1489.
Adolfo Pastor-Aparicio; Jaume Segura-Garcia; Jesus Lopez-Ballester; Santiago Felici-Castell; Miguel Garcia-Pineda; Juan J. Perez-Solano. Psychoacoustic Annoyance Implementation With Wireless Acoustic Sensor Networks for Monitoring in Smart Cities. IEEE Internet of Things Journal 2019, 7, 128 -136.
AMA StyleAdolfo Pastor-Aparicio, Jaume Segura-Garcia, Jesus Lopez-Ballester, Santiago Felici-Castell, Miguel Garcia-Pineda, Juan J. Perez-Solano. Psychoacoustic Annoyance Implementation With Wireless Acoustic Sensor Networks for Monitoring in Smart Cities. IEEE Internet of Things Journal. 2019; 7 (1):128-136.
Chicago/Turabian StyleAdolfo Pastor-Aparicio; Jaume Segura-Garcia; Jesus Lopez-Ballester; Santiago Felici-Castell; Miguel Garcia-Pineda; Juan J. Perez-Solano. 2019. "Psychoacoustic Annoyance Implementation With Wireless Acoustic Sensor Networks for Monitoring in Smart Cities." IEEE Internet of Things Journal 7, no. 1: 128-136.
Psycho-acoustic parameters have been extensively used to evaluate the discomfort or pleasure produced by the sounds in our environment. In this context, wireless acoustic sensor networks (WASNs) can be an interesting solution for monitoring subjective annoyance in certain soundscapes, since they can be used to register the evolution of such parameters in time and space. Unfortunately, the calculation of the psycho-acoustic parameters involved in common annoyance models implies a significant computational cost, and makes difficult the acquisition and transmission of these parameters at the nodes. As a result, monitoring psycho-acoustic annoyance becomes an expensive and inefficient task. This paper proposes the use of a deep convolutional neural network (CNN) trained on a large urban sound dataset capable of efficiently predicting psycho-acoustic annoyance from raw audio signals continuously. We evaluate the proposed regression model and compare the resulting computation times with the ones obtained by the conventional direct calculation approach. The results confirm that the proposed model based on CNN achieves high precision in predicting psycho-acoustic annoyance, predicting annoyance values with an average quadratic error of around 3%. It also achieves a very significant reduction in processing time, which is up to 300 times faster than direct calculation, making CNN designed a clear exponent to work in IoT devices.
Jesus Lopez-Ballester; Adolfo Pastor-Aparicio; Jaume Segura-Garcia; Santiago Felici-Castell; Maximo Cobos. Computation of Psycho-Acoustic Annoyance Using Deep Neural Networks. Applied Sciences 2019, 9, 3136 .
AMA StyleJesus Lopez-Ballester, Adolfo Pastor-Aparicio, Jaume Segura-Garcia, Santiago Felici-Castell, Maximo Cobos. Computation of Psycho-Acoustic Annoyance Using Deep Neural Networks. Applied Sciences. 2019; 9 (15):3136.
Chicago/Turabian StyleJesus Lopez-Ballester; Adolfo Pastor-Aparicio; Jaume Segura-Garcia; Santiago Felici-Castell; Maximo Cobos. 2019. "Computation of Psycho-Acoustic Annoyance Using Deep Neural Networks." Applied Sciences 9, no. 15: 3136.
Wireless Sensor Networks (WSNs) is a group of spatially dispersed autonomous sensor devices, named motes. These motes have a microcontroller, sensors, are powered by AA or AAA batteries, and mainly have the ability to communicate using the IEEE 802.15.4 standard. The motes communicate between them inside the WSN exchanging packets using a multi-hop routing. They use a very low amount of power (below 100 mW). This limits the maximum communication distance between motes within the WSN. Usually, one mote acts as a gateway to other networks and this mote is also called sink or simply Base Station (BS), and the data collected by the sensors of each mote are sent to this mote. The maximum distance between the BS and the nearest mote is below 100 m because of the power limitations of the motes. If the WSN-BS distance is above this boundary, the communication will surely fail. We propose a new technique in order to achieve a long range communication from the WSN, for instance to communicate to a Low Earth Orbit (LEO) satellite. Many proposals in the literature based on Collaborative Beamforming (CB), also known as Distributed or Cooperative Beamforming, for these long range communications are found, however the synchronization of clocks is an almost impossible task given the simplicity and cheapness of the architecture of the motes. To overcome this problem, we propose a new technique, named Stochastic Collaborative Beamforming (SCB), in which we take advantage of the synchronization errors of the clocks. In SCB, it is possible to obtain the adequate time delay that permits the interference or sufficient gain in the direction of the receiver. This gain is obtained from interfering independent signals coming from each mote of the WSN, using a repetition scheme. Although it does not get all the nominal gain that could be obtained in case of a perfect synchronization, it does get a sufficient gain to reach the BS with limited power consumption.
Enrique A. Navarro-Camba; Santiago Felici-Castell; Jaume Segura-García; Miguel García-Pineda; Juan J. Pérez-Solano. Feasibility of a Stochastic Collaborative Beamforming for Long Range Communications in Wireless Sensor Networks. Electronics 2018, 7, 417 .
AMA StyleEnrique A. Navarro-Camba, Santiago Felici-Castell, Jaume Segura-García, Miguel García-Pineda, Juan J. Pérez-Solano. Feasibility of a Stochastic Collaborative Beamforming for Long Range Communications in Wireless Sensor Networks. Electronics. 2018; 7 (12):417.
Chicago/Turabian StyleEnrique A. Navarro-Camba; Santiago Felici-Castell; Jaume Segura-García; Miguel García-Pineda; Juan J. Pérez-Solano. 2018. "Feasibility of a Stochastic Collaborative Beamforming for Long Range Communications in Wireless Sensor Networks." Electronics 7, no. 12: 417.
Nowadays, more than 75% of Internet traffic is multimedia traffic, moreover mobile traffic is growing at a rate of 50% each year. All these data together with the evolution of the cloud infrastructures lead us to develop Cloud Mobile Media (CMM) architectures to support the needs demanded by end users. Nevertheless, due to an inherit higher and variable end to end delay mainly as a result of the virtualization process, new challenges appear in particular for live video streaming applications in order to keep a good Quality of Experience (QoE) of the delivered video. Thus, to keep client’s satisfaction within good levels in terms of Mean Opinion Score (MOS), we propose an adaptive QoE-based architecture running on CMM infrastructures for live streaming services. In order to carry out this goal, we propose an estimation of MOS values using an statistical method based on factor analysis. This estimation is based on different measured variables throughout the CMM infrastructure. In addition, we compare the accuracy of the estimated MOS against well-known publicly available video quality algorithms. With these estimations, our proposal is based on two added controllers to the CMM infrastructure: (a) the Software Defined Network controller that acts as a master and (b) the Media Streamer controller. Each one does different actions on the CMM infrastructure in order to maintain and improve the QoE at each end user. Finally, this architecture has been implemented over a fat tree topology in order to show their functionality. The results show that our proposal works properly and it adapts quickly to the network changes in order to deliver a good MOS.
Santiago Felici-Castell; Jaume Segura-Garcia; Miguel Garcia-Pineda. Adaptive QoE-based architecture on cloud mobile media for live streaming. Cluster Computing 2018, 22, 679 -692.
AMA StyleSantiago Felici-Castell, Jaume Segura-Garcia, Miguel Garcia-Pineda. Adaptive QoE-based architecture on cloud mobile media for live streaming. Cluster Computing. 2018; 22 (3):679-692.
Chicago/Turabian StyleSantiago Felici-Castell; Jaume Segura-Garcia; Miguel Garcia-Pineda. 2018. "Adaptive QoE-based architecture on cloud mobile media for live streaming." Cluster Computing 22, no. 3: 679-692.
Enrique A. Navarro-Camba; Santiago Felici-Castell; Juan José Pérez Solano; Jaume Segura-Garcia; Miguel García-Pineda; Adolfo Pastor-Aparicio. Stochastic Collaborative Beamforming in Wireless Sensor Networks. Proceedings of the Euro American Conference on Telematics and Information Systems 2018, 30 .
AMA StyleEnrique A. Navarro-Camba, Santiago Felici-Castell, Juan José Pérez Solano, Jaume Segura-Garcia, Miguel García-Pineda, Adolfo Pastor-Aparicio. Stochastic Collaborative Beamforming in Wireless Sensor Networks. Proceedings of the Euro American Conference on Telematics and Information Systems. 2018; ():30.
Chicago/Turabian StyleEnrique A. Navarro-Camba; Santiago Felici-Castell; Juan José Pérez Solano; Jaume Segura-Garcia; Miguel García-Pineda; Adolfo Pastor-Aparicio. 2018. "Stochastic Collaborative Beamforming in Wireless Sensor Networks." Proceedings of the Euro American Conference on Telematics and Information Systems , no. : 30.
IoT es un concepto que hace referencia a una red de objetos cotidianos interconectados a través de Internet. Esta es una de las áreas de creciente interés y necesario conocimiento para los estudiantes de Ingeniería de Telecomunicaciones/Telemática. Los principales obstáculos a los que se enfrentan los estudiantes con IoT son por un lado la integración del hardware, así como la necesidad de disponer de sistemas de gestión para manejar el volumen de datos que generan. Este trabajo muestra unas experiencias realizadas con un grupo de estudiantes en el grado de ingeniería telemática y en el máster de telecomunicación.Keywords: IoT, experiencias, FIWARE, Raspberry Pi, ThingSpeak.
Jaume Segura García; Santiago Felici Castell; Juan José Pérez Solano; Miguel García Pineda; Antonio Soriano Asensi. Incorporación de Internet de las Cosas (IoT) en la docencia universitaria en dos etapas: hardware y software. Libro de Actas IN-RED 2018: IV Congreso Nacional de Innovación Educativa y Docencia en Red 2018, 1 .
AMA StyleJaume Segura García, Santiago Felici Castell, Juan José Pérez Solano, Miguel García Pineda, Antonio Soriano Asensi. Incorporación de Internet de las Cosas (IoT) en la docencia universitaria en dos etapas: hardware y software. Libro de Actas IN-RED 2018: IV Congreso Nacional de Innovación Educativa y Docencia en Red. 2018; ():1.
Chicago/Turabian StyleJaume Segura García; Santiago Felici Castell; Juan José Pérez Solano; Miguel García Pineda; Antonio Soriano Asensi. 2018. "Incorporación de Internet de las Cosas (IoT) en la docencia universitaria en dos etapas: hardware y software." Libro de Actas IN-RED 2018: IV Congreso Nacional de Innovación Educativa y Docencia en Red , no. : 1.
The application of the VR to the renderization of ancient and lost buildings is one important topic in the cultural heritage field nowadays. Moreover, the addition of other senses apart from the graphical view, increases the sensation of immersion in a virtual application. The aim of this paper is to show the work on a virtual acoustic system, based on Unity, FMOD and Csound. This system has been implemented to render binaural auralizations and has been applied to the renderization of an old and lost theatre in València (Spain). This theatre was firstly build in the 16th century, and rebuilt several times until the 18th century. It has been modelled from ancient documents. The auralization of several theatrical excerpts of different Spanish authors of that time is also presented.
Sebastián Mirasol-Menacho; Ana Planells-Pérez; Jaume Segura-Garcia; Santiago Felici-Castell; Máximo Cobos-Serrano; Rosa Cibrián; Alicia Giménez-Pérez; Joan Oleza-Simó. Virtual Acoustic Rendering in Old Spaces: Application to an Early-Modern Theatre in València, “L’Olivera”. Privacy Enhancing Technologies 2018, 261 -274.
AMA StyleSebastián Mirasol-Menacho, Ana Planells-Pérez, Jaume Segura-Garcia, Santiago Felici-Castell, Máximo Cobos-Serrano, Rosa Cibrián, Alicia Giménez-Pérez, Joan Oleza-Simó. Virtual Acoustic Rendering in Old Spaces: Application to an Early-Modern Theatre in València, “L’Olivera”. Privacy Enhancing Technologies. 2018; ():261-274.
Chicago/Turabian StyleSebastián Mirasol-Menacho; Ana Planells-Pérez; Jaume Segura-Garcia; Santiago Felici-Castell; Máximo Cobos-Serrano; Rosa Cibrián; Alicia Giménez-Pérez; Joan Oleza-Simó. 2018. "Virtual Acoustic Rendering in Old Spaces: Application to an Early-Modern Theatre in València, “L’Olivera”." Privacy Enhancing Technologies , no. : 261-274.
Although much work has been done since wireless sensor networks appeared, there is not a great deal of information available on real deployments that incorporate basic features associated with these networks, in particular multihop routing and long lifetimes features. In this article, an environmental monitoring application (Internet of Things oriented) is described, where temperature and relative humidity samples are taken by each mote at a rate of 2 samples/min and sent to a sink using multihop routing. Our goal is to analyse the different strategies to gather the information from the different motes in this context. The trade-offs between ‘sending always’ and ‘buffering locally’ approaches were analysed and validated experimentally, taking into account power consumption, lifetime, efficiency and reliability. When buffering locally, different options were considered such as saving in either local RAM or FLASH memory, as well different alternatives to reduce overhead with different packet sizes. The conclusion is that in terms of energy and durability, the best option is to reduce the overhead. Nevertheless, sending larger packets is not worthy when the probability of retransmission is high. If real-time monitoring is required, then sending always is better than buffering locally.
Santiago Felici-Castell; Juan J Pérez-Solano; Jaume Segura-Garcia; Miguel García-Pineda; Antonio Soriano Asensi. Experimental trade-offs between different strategies for multihop communications evaluated over real deployments of wireless sensor network for environmental monitoring. International Journal of Distributed Sensor Networks 2018, 14, 1 .
AMA StyleSantiago Felici-Castell, Juan J Pérez-Solano, Jaume Segura-Garcia, Miguel García-Pineda, Antonio Soriano Asensi. Experimental trade-offs between different strategies for multihop communications evaluated over real deployments of wireless sensor network for environmental monitoring. International Journal of Distributed Sensor Networks. 2018; 14 (5):1.
Chicago/Turabian StyleSantiago Felici-Castell; Juan J Pérez-Solano; Jaume Segura-Garcia; Miguel García-Pineda; Antonio Soriano Asensi. 2018. "Experimental trade-offs between different strategies for multihop communications evaluated over real deployments of wireless sensor network for environmental monitoring." International Journal of Distributed Sensor Networks 14, no. 5: 1.
Current mobile service providers are offering Gigabit Internet access over LTE-Advanced networks. Traditional services, such as live video streaming, over wired networks are feasible on these networks. However different aspects should be taken into account due to the fast changing network conditions as well as the constrained resources of the mobile phones, in order to provide a good subjective video quality in terms of Mean Opinion Score (MOS). Our goal is to estimate and predict this subjective metric without information or reference from the original video, known as Non Reference approach. This approach is important for the Service Provider from a practical point of view, because it can keep the customer satisfaction at good levels. We analyze different estimation techniques running over a set of monitored variables throughout the whole steaming system, from the streaming server to the mobile phone. We have gathered variables related to bit stream, basic video quality metrics as well as Quality of Services variables. These variables are used to estimate MOS in a reliable and robust way. We compare three techniques such as Artificial Neural Networks (ANN), Factor Analysis (FA) and Multinomial Linear Regression, at different time scales and with Full Reference and Non Reference approaches. We carry out a performance evaluation of these techniques, concluding that the behavior of MOS estimation based on FA is more accurate, unless we had a lossless scenario related to Guaranteed Bit Rate services, where ANN performs better. The subjective video quality has been evaluated through surveys. Finally, we evaluate the accuracy of the estimated MOS against well known publicly available video quality algorithms following the recommendations given by Video Quality Experts Group (VQEG).
Jaume Segura-Garcia; Santiago Felici-Castell; Miguel Garcia-Pineda. Performance evaluation of different techniques to estimate subjective quality in live video streaming applications over LTE-Advance mobile networks. Journal of Network and Computer Applications 2018, 107, 22 -37.
AMA StyleJaume Segura-Garcia, Santiago Felici-Castell, Miguel Garcia-Pineda. Performance evaluation of different techniques to estimate subjective quality in live video streaming applications over LTE-Advance mobile networks. Journal of Network and Computer Applications. 2018; 107 ():22-37.
Chicago/Turabian StyleJaume Segura-Garcia; Santiago Felici-Castell; Miguel Garcia-Pineda. 2018. "Performance evaluation of different techniques to estimate subjective quality in live video streaming applications over LTE-Advance mobile networks." Journal of Network and Computer Applications 107, no. : 22-37.
Miguel Garcia-Pineda; Jaume Segura-Garcia; Santiago Felici-Castell. Estimation techniques to measure subjective quality on live video streaming in Cloud Mobile Media services. Computer Communications 2018, 118, 27 -39.
AMA StyleMiguel Garcia-Pineda, Jaume Segura-Garcia, Santiago Felici-Castell. Estimation techniques to measure subjective quality on live video streaming in Cloud Mobile Media services. Computer Communications. 2018; 118 ():27-39.
Chicago/Turabian StyleMiguel Garcia-Pineda; Jaume Segura-Garcia; Santiago Felici-Castell. 2018. "Estimation techniques to measure subjective quality on live video streaming in Cloud Mobile Media services." Computer Communications 118, no. : 27-39.
Sound pleasantness or annoyance perceived in urban soundscapes is a major concern in environmental acoustics. Binaural psychoacoustic parameters are helpful to describe generic acoustic environments, as it is stated within the ISO 12913 framework. In this paper, the application of a Wireless Acoustic Sensor Network (WASN) to evaluate the spatial distribution and the evolution of urban acoustic environments is described. Two experiments are presented using an indoor and an outdoor deployment of a WASN with several nodes using an Internet of Things (IoT) environment to collect audio data and calculate meaningful parameters such as the sound pressure level, binaural loudness and binaural sharpness. A chunk of audio is recorded in each node periodically with a microphone array and the binaural rendering is conducted by exploiting the estimated directional characteristics of the incoming sound by means of DOA estimation. Each node computes the parameters in a different location and sends the values to a cloud-based broker structure that allows spatial statistical analysis through Kriging techniques. A cross-validation analysis is also performed to confirm the usefulness of the proposed system.
Jaume Segura-Garcia; Juan Miguel Navarro-Ruiz; Juan J. Perez-Solano; Jose Montoya-Belmonte; Santiago Felici-Castell; Maximo Cobos; Ana M. Torres-Aranda. Spatio-Temporal Analysis of Urban Acoustic Environments with Binaural Psycho-Acoustical Considerations for IoT-Based Applications. Sensors 2018, 18, 690 .
AMA StyleJaume Segura-Garcia, Juan Miguel Navarro-Ruiz, Juan J. Perez-Solano, Jose Montoya-Belmonte, Santiago Felici-Castell, Maximo Cobos, Ana M. Torres-Aranda. Spatio-Temporal Analysis of Urban Acoustic Environments with Binaural Psycho-Acoustical Considerations for IoT-Based Applications. Sensors. 2018; 18 (3):690.
Chicago/Turabian StyleJaume Segura-Garcia; Juan Miguel Navarro-Ruiz; Juan J. Perez-Solano; Jose Montoya-Belmonte; Santiago Felici-Castell; Maximo Cobos; Ana M. Torres-Aranda. 2018. "Spatio-Temporal Analysis of Urban Acoustic Environments with Binaural Psycho-Acoustical Considerations for IoT-Based Applications." Sensors 18, no. 3: 690.
Current mobile networks are providing high speed access to Internet at a rate of Gigabits per second. In this scenario, traditional services over wired networks are an alternative, in particular those based on live video streaming. But in the transition, different issues should be considered due to the rapid changing network conditions and the limited resources of the mobile devices. These issues should be taken into account to keep a good Quality of Experience (QoE) of the video in terms of a high Mean Opinion Score (MOS), a subjective video quality. Our goal is to estimate and predict this subjective metric in a holistic manner. Thus, we have analyzed and measured different variables related to Quality of Service, bit stream and basic video quality metrics of live video streaming over LTE Advanced (4G) mobile networks, as well as server side. With these variables, we apply an statistical method, called Factor Analysis based on the correlation of the variables, which allows us to estimate MOS of the delivered video in a robust and reliable way, both in Full Reference and Non Reference approaches. The real MOS has been evaluated through surveys. Finally, we compare the accuracy of the estimated MOS for the different approaches and compare their performance with well known publicly available video quality algorithms.
Miguel García-Pineda; Jaume Segura-García; Santiago Felici-Castell. A holistic modeling for QoE estimation in live video streaming applications over LTE Advanced technologies with Full and Non Reference approaches. Computer Communications 2018, 117, 13 -23.
AMA StyleMiguel García-Pineda, Jaume Segura-García, Santiago Felici-Castell. A holistic modeling for QoE estimation in live video streaming applications over LTE Advanced technologies with Full and Non Reference approaches. Computer Communications. 2018; 117 ():13-23.
Chicago/Turabian StyleMiguel García-Pineda; Jaume Segura-García; Santiago Felici-Castell. 2018. "A holistic modeling for QoE estimation in live video streaming applications over LTE Advanced technologies with Full and Non Reference approaches." Computer Communications 117, no. : 13-23.
Enrique A. Navarro-Camba; Antonio Soriano Asensi; Miguel García-Pineda; Jaume Segura-Garcia; Santiago Felici-Castell; Jesus Lopez-Ballester. Study of transmission parameters under controlled multipath environment using Rasp Pi3. Proceedings of the Euro American Conference on Telematics and Information Systems 2018, 33 .
AMA StyleEnrique A. Navarro-Camba, Antonio Soriano Asensi, Miguel García-Pineda, Jaume Segura-Garcia, Santiago Felici-Castell, Jesus Lopez-Ballester. Study of transmission parameters under controlled multipath environment using Rasp Pi3. Proceedings of the Euro American Conference on Telematics and Information Systems. 2018; ():33.
Chicago/Turabian StyleEnrique A. Navarro-Camba; Antonio Soriano Asensi; Miguel García-Pineda; Jaume Segura-Garcia; Santiago Felici-Castell; Jesus Lopez-Ballester. 2018. "Study of transmission parameters under controlled multipath environment using Rasp Pi3." Proceedings of the Euro American Conference on Telematics and Information Systems , no. : 33.
Santiago Felici-Castell; Enrique Navarro-Camba; Juan José Pérez Solano; Jaume Segura-Garcia; Adolfo Pastor Aparicio; Miguel García-Pineda. Web Tool for Path Analysis in Wireless Sensor Networks to Improve Their Performance. Proceedings of the Euro American Conference on Telematics and Information Systems 2018, 28 .
AMA StyleSantiago Felici-Castell, Enrique Navarro-Camba, Juan José Pérez Solano, Jaume Segura-Garcia, Adolfo Pastor Aparicio, Miguel García-Pineda. Web Tool for Path Analysis in Wireless Sensor Networks to Improve Their Performance. Proceedings of the Euro American Conference on Telematics and Information Systems. 2018; ():28.
Chicago/Turabian StyleSantiago Felici-Castell; Enrique Navarro-Camba; Juan José Pérez Solano; Jaume Segura-Garcia; Adolfo Pastor Aparicio; Miguel García-Pineda. 2018. "Web Tool for Path Analysis in Wireless Sensor Networks to Improve Their Performance." Proceedings of the Euro American Conference on Telematics and Information Systems , no. : 28.
Hoy en día el tráfico de video de internetsignifica alrededor del 65-70% del tráfico total. Se prevéque en 2019 aumente hasta el 80%. Debido a esto se hacenecesario optimizar y mejorar las tecnologías relacionadascon la transmisión de video para garantizar una calidad deexperiencia adecuada. Es por ello que se están desarrollando nuevos protocolos de transmisión de videoadaptativos basados en DASH. Debido a que su uso estáaumentando en los últimos años para realizar streamingsobre HTTP. En este artículo presentamos la herramientaMediaDASH Tool, la cual es una aplicación web quepermite de manera muy intuitiva poder comprimir ypreparar videos para su difusión con DASH. Así como suposterior visualización a través de la misma plataforma.Esta herramienta puede ser de gran utilidad para usuariosfinales que quieran disponer de su sistema DASH comotambién para investigadores que quieran testear suscontenidos multimedia haciendo uso de estos protocolos.
Miguel García-Pineda; Daniel García-Costa; Jonatan Hannecke-Esteve; Santiago Felici-Castell; Jaume Segura-García. MediaDASH Tool: Plataforma Web para la Codificación, Difusión y Recepción de Videos DASH. Proceedings XIII Jornadas de Ingenieria Telematica - JITEL2017 2017, 7 -14.
AMA StyleMiguel García-Pineda, Daniel García-Costa, Jonatan Hannecke-Esteve, Santiago Felici-Castell, Jaume Segura-García. MediaDASH Tool: Plataforma Web para la Codificación, Difusión y Recepción de Videos DASH. Proceedings XIII Jornadas de Ingenieria Telematica - JITEL2017. 2017; ():7-14.
Chicago/Turabian StyleMiguel García-Pineda; Daniel García-Costa; Jonatan Hannecke-Esteve; Santiago Felici-Castell; Jaume Segura-García. 2017. "MediaDASH Tool: Plataforma Web para la Codificación, Difusión y Recepción de Videos DASH." Proceedings XIII Jornadas de Ingenieria Telematica - JITEL2017 , no. : 7-14.