Área de Sistemas de la Información y las Comunicaciones

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Author: Turró Ribalta, Carlos ×

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    WLAN IEEE 802.11 a/b/g/n Indoor Coverage and Interference Performance Study
    (IARIA, 2011) Sendra Compte, Sandra; García Pineda, Miguel; Turró Ribalta, Carlos; Lloret Mauri, Jaime; Dpto. de Comunicaciones; Área de Sistemas de la Información y las Comunicaciones; Escuela Politécnica Superior de Gandia; Instituto de Investigación para la Gestión Integrada de Zonas Costeras
    An adequate wireless network plan is needed to replace the traditional wired LANs. A full coverage WLAN offers the flexibility to relocate people and equipment or to reconfigure and add more wireless devices to the network. Usually, an IEEE 802.11 variant is chosen based on their bandwidth and their coverage area. However, sometimes there are special cases where the best technology is not the newest one. In addition, suitable positioning of access points (AP) is crucial to determine the efficiency of the network. E.g. in the case where devices are going to transmit at a maximum of 1 Mbps, any choice is acceptable, but when it is required higher performance, other factors must be considered. In this paper, we compare IEEE 802.11a/b/g/n indoor environments to know what technology is better. This comparison will be taken in terms of RSSI, coverage area, and measuring the interferences between channels. These key factors must be optimum to have high performance in the WLAN. This study will help the researchers to choose the best technology depending of their deploying case, and we will see study the best variant for indoors.
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    Efficient Generation of High-Quality Multilingual Subtitles for Video Lecture Repositories
    (Springer Verlag (Germany), 2015-11-26) Valor Miró, Juan Daniel; Silvestre Cerdà, Joan Albert; Civera Saiz, Jorge; Turró Ribalta, Carlos; Juan Císcar, Alfonso; Dpto. de Sistemas Informáticos y Computación; Área de Sistemas de la Información y las Comunicaciones; Escuela Politécnica Superior de Alcoy; Escuela Técnica Superior de Ingeniería Informática; Instituto Universitario Valenciano de Investigación en Inteligencia Artificial; European Commission; Ministerio de Economía y Competitividad
    Video lectures are a valuable educational tool in higher education to support or replace face-to-face lectures in active learning strategies. In 2007 the Universitat Politècnica de València (UPV) implemented its video lecture capture system, resulting in a high quality educational video repository, called poliMedia, with more than 10.000 mini lectures created by 1.373 lecturers. Also, in the framework of the European project transLectures, UPV has automatically generated transcriptions and translations in Spanish, Catalan and English for all videos included in the poliMedia video repository. transLectures’s objective responds to the widely-recognised need for subtitles to be provided with video lectures, as an essential service for non-native speakers and hearing impaired persons, and to allow advanced repository functionalities. Although high-quality automatic transcriptions and translations were generated in transLectures, they were not error-free. For this reason, lecturers need to manually review video subtitles to guarantee the absence of errors. The aim of this study is to evaluate the efficiency of the manual review process from automatic subtitles in comparison with the conventional generation of video subtitles from scratch. The reported results clearly indicate the convenience of providing automatic subtitles as a first step in the generation of video subtitles and the significant savings in time of up to almost 75 % involved in reviewing subtitles.
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    Efficiency and usability study of innovative computer-aided transcription strategies for video lecture repositories
    (Elsevier, 2015-11) Valor Miró, Juan Daniel; Silvestre Cerdà, Joan Albert; Civera Saiz, Jorge; Turró Ribalta, Carlos; Juan Císcar, Alfonso; Dpto. de Sistemas Informáticos y Computación; Área de Sistemas de la Información y las Comunicaciones; Escuela Politécnica Superior de Alcoy; Escuela Técnica Superior de Ingeniería Informática; Instituto Universitario Valenciano de Investigación en Inteligencia Artificial; European Commission; Ministerio de Economía y Competitividad
    [EN] Video lectures are widely used in education to support and complement face-to-face lectures. However, the utility of these audiovisual assets could be further improved by adding subtitles that can be exploited to incorporate added-value functionalities such as searchability, accessibility, translatability, note-taking, and discovery of content-related videos, among others. Today, automatic subtitles are prone to error, and need to be reviewed and post-edited in order to ensure that what students see on-screen are of an acceptable quality. This work investigates different user interface design strategies for this post-editing task to discover the best way to incorporate automatic transcription technologies into large educational video repositories. Our three-phase study involved lecturers from the Universitat Polite`cnica de Vale`ncia (UPV) with videos available on the poliMedia video lecture repository, which is currently over 10,000 video objects. Simply by conventional post-editing automatic transcriptions users almost reduced to half the time that would require to generate the transcription from scratch. As expected, this study revealed that the time spent by lecturers reviewing automatic transcriptions correlated directly with the accuracy of said transcriptions. However, it is also shown that the average time required to perform each individual editing operation could be precisely derived and could be applied in the definition of a user model. In addition, the second phase of this study presents a transcription review strategy based on confidence measures (CM) and compares it to the conventional post-editing strategy. Finally, a third strategy resulting from the combination of that based on CM with massive adaptation techniques for automatic speech recognition (ASR), achieved to improve the transcription review efficiency in comparison with the two aforementioned strategies. 2015 Elsevier B.V. All rights reserved.
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    Generación eficiente de transcripciones y traducciones automáticas en poliMedia
    (Editorial Universitat Politècnica de València, 2016-07-19) Valor Miró, Juan; Turró Ribalta, Carlos; Civera Saiz, Jorge; Juan Císcar, Alfons; Dpto. de Sistemas Informáticos y Computación; Área de Sistemas de la Información y las Comunicaciones; Escuela Técnica Superior de Ingeniería Informática; Instituto Universitario Valenciano de Investigación en Inteligencia Artificial
    [EN] Usage of educational videos in higher education has raised quickly for different educational applications, which leads to platforms and services such as poliMedia, of the Polytechnic University of Valencia (UPV), which enables the creation, publication and dissemination of this educational multimedia content. Through various research projects, and specifically the European project transLectures, UPV implemented a system that automatically generates subtitles in various languages for all poliMedia videos. Creation of these subtitles is made by an automatic speech recognition and machine translation system that provides high accuracy in both recognition and translation to the main European languages. Transcripts and translations are not only used to improve accessibility, but also allow search and retrieval of video contents within the video portal. So a user can locate the video, and the time within it, where a certain word is said for later viewing. In this article we also extend previous work in the assessment of the review process, including transcription of French and Spanish to Catalan translation.
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    Grabación automatizada de clases magistrales: el proyecto Videoapuntes de la UPV
    (Servicio de Publicaciones de la Universidad e Murcia, 2014) Turró Ribalta, Carlos; Despujol Zabala, Ignacio; Busquets Mataix, Jaime Luis; Dpto. de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería del Diseño; Área de Sistemas de la Información y las Comunicaciones
    [EN] On the second half of the academic year 2011-2012, the Polytechnic University of Valencia (UPV) has developed a pilot test on automated lecture recording, called ¿Videoapuntes¿, in which high quality recordings of the lectures have been made for several courses. Then students are able to view those recordings, including video, audio and the teacher¿s computer screen through the virtual campus platform using a web interface. These recordings have been made following the guidelines of the Opencast consortium, of which UPV is member. Results of this pilot have been very positive both in teachers and students opinion, so we have developed a second phase in which we have recorded more than 800 hours on the first half of the 2012-2013 academic year and now we are currently recording around 1500 hours per period. In this paper we will present the system and the results obtained during the period of the Videoapuntes project.
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    Evaluación del proceso de revisión de transcripciones automáticas para vídeos Polimedia
    (Editorial Universitat Politècnica de València, 2014-07-15) Valor Miró, Juan Daniel; Nadine Spencer, Rachel; Pérez González de Martos, Alejandro Manuel; Garcés Díaz-Munío, Gonzalo Vicente; Turró Ribalta, Carlos; Civera Saiz, Jorge; Juan Císcar, Alfonso; Dpto. de Sistemas Informáticos y Computación; Área de Sistemas de la Información y las Comunicaciones; Escuela Técnica Superior de Ingeniería Informática; Escuela de Doctorado; Instituto Universitario Valenciano de Investigación en Inteligencia Artificial; European Commission
    [EN] Video lectures are a tool of proven value and wide acceptance in universities that are leading to platforms like poliMedia. transLectures is a European project that generates automatic high-quality transcriptions and translations for the poliMedia platform, and improve them by using massive adaptation and intelligent interaction techniques. In this paper we present the evaluation with lecturers carried out under the Doc`encia en Xarxa 2012-2013 call, with the aim to study the process of supervise transcriptions, compared with to transcribe from scratch.
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    La iniciativa UPV[X] de la Universitat Politècnica de València
    (2013) Despujol Zabala, Ignacio; Turró Ribalta, Carlos; Busquets Mataix, Jaime Luis; Dpto. de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería del Diseño; Área de Sistemas de la Información y las Comunicaciones
    Se describe UPV[X], la iniciativa de MOOC de la UPV, comentando las directrices para crear un curso, la plataforma upvx.es y los datos obtenidos.
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    Users macro and micro-mobility study using WLANs in a University Campus
    (IARIA, 2011) García Pineda, Miguel; Sendra Compte, Sandra; Turró Ribalta, Carlos; Lloret Mauri, Jaime; Dpto. de Comunicaciones; Área de Sistemas de la Información y las Comunicaciones; Escuela Politécnica Superior de Gandia; Instituto de Investigación para la Gestión Integrada de Zonas Costeras
    Wireless Local Area Networks are important and necessary in university campuses and large enterprise areas. Such networks allow us to have data connection anywhere without wires and many other benefits such as to obtain the location of the users. Moreover, they can be used to track the users. Tracking the user’s mobility we can know which places are most visited, if people have to go to places that are far from their office, detect the best location for emergency points, etc. Moreover, we can study the mobility pattern of several users. According to this pattern, the network can use reconfiguration systems to reallocate resources and improve its connectivity. This paper shows us the case study of a university campus of two square kilometers and how we have taken advantage of the information gathered from the wireless network. Two studies (macro and micro mobility) have been done in order to make this survey. This approach can be used by the enterprises to optimize the sites to place their resources (network printers, servers, meeting rooms, etc.). Furthermore, the network’s administrators can use these parameters to improve the network’s behavior by providing a better connection, better roaming, etc.
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    What Does the Data Say about Effective University Online Internships? The Universitat Politecnica de Valencia Experience Using MOOC during COVID-19 Lockdown
    (MDPI AG, 2022-01) Despujol Zabala, Ignacio; Castañeda, Linda; Turró Ribalta, Carlos; Dpto. de Ingeniería de la Construcción y de Proyectos de Ingeniería Civil; Escuela Técnica Superior de Ingeniería del Diseño; Área de Sistemas de la Información y las Comunicaciones; European Commission; Universitat Politècnica de València
    [EN] Universitat Politecnica de Valencia's students can take in-company internships during their bachelor's degrees, and, with the COVID-19 lockdown, 224 students had their internships cancelled. EdX launched a free certificate initiative for its partners, and UPV gave the possibility of using MOOCs to cover for the credit needed to graduate. We have tried to answer the question, "Is it possible to use MOOCs to replace an in-company internship in an emergency?" using Learning Analytics; 179 students chose this possibility. More than 90% of the students got their academic credit, and their satisfaction with the initiative was 4.6/5. They scored MOOCs' quality with 4/5 and the contribution of MOOCs to their careers with 3.6/5; 95% will take a MOOC, and 69.3% think it is worth paying for the certificate. The answers to the question evaluating if MOOCs had given them the same knowledge as a company internship are positive but much less conclusive, with an average of 2.87/5. We conclude that MOOCs achieved the pursued goal during the emergency. With more time for planning and extra resources for remote support, they can be a good solution in environments where online is the only choice, and they can even be used as a tool to reinforce some of the knowledge needed to be successful in a traditional internship.
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    Doblaje automático de vídeo-charlas educativas en UPV[Media]
    (Editorial Universitat Politècnica de València, 2023-01-09T07:40:08Z) Pérez González de Martos, Alejandro Manuel; Giménez Pastor, Adrián; Jorge Cano, Javier; Iranzo Sánchez, Javier; Silvestre Cerdà, Joan Albert; Garcés Díaz-Munío, Gonzalo Vicente; Baquero Arnal, Pau; Sanchis Navarro, José Alberto; Civera Saiz, Jorge; Juan Císcar, Alfonso; Turró Ribalta, Carlos; Dpto. de Sistemas Informáticos y Computación; Área de Sistemas de la Información y las Comunicaciones; Escuela Politécnica Superior de Alcoy; Escuela Técnica Superior de Ingeniería Informática; Escuela de Doctorado; Instituto Universitario Valenciano de Investigación en Inteligencia Artificial; Agencia Estatal de Investigación; European Commission
    [EN] More and more universities are banking on the production of digital contents to support online or blended learning in higher education. Over the last years, the MLLP research group has been working closely with the UPV’s ASIC media services in order to enrich educational multimedia resources through the application of natural language processing technologies including automatic speech recognition, machine translation and text-tospeech. In this work we present the steps that are being followed for the comprehensive translation of these materials, specifically through (semi-)automatic dubbing by making use of state-of-the-art speaker-adaptive text-to-speech technologies.