Fernando Llopis

Fernando Llopis
University of Alicante | UA · Department of Software and Computing Systems

About

107
Publications
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459
Citations
Citations since 2017
7 Research Items
47 Citations
2017201820192020202120222023024681012
2017201820192020202120222023024681012
2017201820192020202120222023024681012
2017201820192020202120222023024681012

Publications

Publications (107)
Conference Paper
In this paper we present our contribution to the TREC 2019 Incident Streams track. We submitted four runs to the 2019-B edition of this task. Our main goal is to evaluate the effectiveness of sentiment analysis and information retrieval techniques to automatically detect and prioritize incidents on social media streams. Here, we describe these tech...
Conference Paper
In this paper we present our contribution for the TREC 2018 Real-Time Summarization track. This task contains two scenarios: push notifications, and email digest. We participated in both, submitting three runs on each one. Our main goal was to evaluate the effectiveness the techniques employed in Social Analytics, a reputation analysis platform, wh...
Conference Paper
The recent failures of traditional poll models, like the predictions in United Kingdom with the Brexit, or in United States presidential election with the victory of Donald Trump, have been noteworthy. With the decline of traditional poll models and the growth of the social networks, automatic tools are gaining popularity to make predictions in thi...
Article
Full-text available
La Web 2.0 ha focalizado la importancia de la información, no en unos pocos expertos en un tema, sino en una multitud de opiniones vertidas por usuarios a través de diversos medios en las redes sociales. Debido a ello, han cobrado un mayor interés los sistemas que son capaces de determinar qué es lo que piensan los usuarios sobre un determinado con...
Article
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Mobile devices have significantly changed the way users access the information available on Internet. These devices allow instant access anytime and anywhere, but they have a number of important limitations with respect to personal computers. The limited screen space and, sometimes, the limited capacity to receive the information, make the selectio...
Conference Paper
Continuous changes in the real world implies the need of change in the curriculums of the students. Aspects such as leadership, team management, competitiveness, may be more important than the technical knowledge. On the other hand, new demands require a symbiotic relationship between business and university. In the article it presents an experienc...
Article
The great amount of available online information is making increasingly more and more difficult that users can assimilate such as volume of information, being this almost inconceivable without using Human Language Technologies (HLT) tools, for instance, information retrieval systems or automatic summarisers. The interest of this emerging project (a...
Conference Paper
On-line Social Networks have increased their popularity rapidly since their creation, providing a huge amount of data which can be leverage to extract useful information related to commercial and social human behaviours. One of the most useful information that can be extracted is the geographical one. This paper shows an approach to detect the geog...
Article
This introduction provides an overview of the state-of-the-art technology in Applications of Natural Language to Information Systems. Specifically, we analyze the need for such technologies to successfully address the new challenges of modern information systems, in which the exploitation of the Web as a main data source on business systems becomes...
Article
This project is focused on textual treatment in Spanish in order to reduce language barriers that hinder hearing impaired people from reading comprehension, or even people learning a new language. This paper describes the methodology used to face the different problems related to the proposed objective, as well as the working hypothesis and partial...
Article
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The main objective of this project is based on the need to reconsider the clasical HLT philosophy to adapt it, not only to the currently available resources (unstructured data with multimodality, multilinguality and different levels of formality) but also to the real needs of the final users. In order to reach this objective it is necessary to incl...
Article
The geographical focus of a document identifies the relevant locations mentioned in text. This paper presents a corpus-based approach to detecting the geographical focus in documents. Despite other approaches focused on using solely geographical information, our proposal employs all the textual information included in the corpus under the assumptio...
Article
Full-text available
El objetivo de este proyecto se basa en la necesidad de replantearse la filosofía clásica del TLH para adecuarse tanto a las fuentes disponibles actualmente (datos no estructurados con multi-modalidad, multi-lingualidad y diferentes grados de formalidad) como a las necesidades reales de los usuarios finales. Para conseguir este objetivo es necesari...
Article
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Tratamiento de la dimensión espacial en el texto y su aplicación a la recuperación de información Resumen: Proyecto emergente centrado en la desambiguación de topónimos y la detección del foco geográfico en el texto. La finalidad es mejorar el rendimiento de los sistemas de recuperación de información geográfica. Se describen los problemas abordado...
Article
This project is focused on toponym disambiguation and geographical focus identification in text. The goal is to improve the performance of geographic information retrieval systems. This paper describes the problems faced, working hypothesis, tasks proposed and goals currently achieved. © 2012 Sociedad Española para el Procesamiento del Lenguaje Nat...
Conference Paper
In this paper we present a complete system for the treatment of both geographical and temporal dimensions in text and its application to information retrieval. This system has been evaluated in both the GeoTime task of the 8th and 9th NTCIR workshop in the years 2010 and 2011 respectively, making it possible to compare the system to contemporary ap...
Conference Paper
Full-text available
Many users employ vague geographical expressions to query Information Retrieval systems. These fuzzy entities do not appear neither in gazetteers nor in geographical databases. Searches such as “Ski resorts in north-central Spain” or “Restaurants near the Teatro Real of Madrid” often do not get the expected results, mainly due to the difficulty of...
Conference Paper
royecto emergente centrado en la detección e interpretación de metáforas con métodos no supervisados. Se presenta la caracterización del problema metafórico en Procesamiento del Lenguaje Natural, los fundamentos teóricos del proyecto y los primeros resultados.
Conference Paper
Full-text available
In this paper we present an approach to detect external plagiarism based on textual similarity. This is an efficient and precise method that can be applied over large sets of documents. The system that we have developed contains a first phase of document selection that uses a variant of tf-idf applied over the terms that appear in the two documents...
Conference Paper
Full-text available
In our participation in the ImageCLEF 2009 Photo Retrieval task we pursued two objectives: Firstly, to re-evaluate MultiModal Local Context Analysis (MMLCA), our multimodal fusion technique. Secondly, to evaluate a new subquery generation technique based on clustering. From the experiments conducted: Firstly, we confirmed MMLCA performs better for...
Conference Paper
This paper focuses on the proposal and evaluation of two multimodal fusion techniques in the field of Visual Information Retrieval (VIR). These proposals are based on two widely used fusion strategies in the VIR area, the multimodal blind relevance feedback and the multimodal re-ranking strategy. Unlike the existent techniques, our alternative pr...
Article
Full-text available
Common approaches to evaluate Question Answering (QA) systems consider exclusively the accuracy of the answers. It ignores an essential feature of all the computational proce- dures: the eciency. In this note, we explore new evaluation measures that take into account, in addition to the accuracy, the eciency, which is incorporated through the magni...
Conference Paper
Full-text available
The paper describes our participation in the Monolingual tasks at CLEF 2007. We submitted results for the following languages: Hungarian, Bulgarian and Czech. We focused on studying different query expansion techniques: Probabilistic Relevance Feedback (PRF) and Mutual Information Relevance Feedback (MI-RF) to improve retrieval performance. After a...
Conference Paper
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This paper describes the joint work of two teams belonging to the TEXT-MESS project. The system presented at ImageCLEFPhoto task combines one module based on filtering and other based on clustering. The main objective was to study the behavior of these methods with a large number of configurations in order to increase our chances of success. The sy...
Conference Paper
The motivation of this research project is to build an e-learning platform for educational contents in the field of computer science. Students will be able to use this platform to attend lessons, to practice as part of their learning experience with a certain set of tools and, finally, to check their progress using rich tests including media conten...
Article
Full-text available
This paper describes our participation in the Medical Retrieval task at ImageCLEF 2008. We present the joint work of two teams belonging to the TEXT-MESS project using a new system that combines the 2 individual systems of these teams. The aim of the experiments performed is to figure out if there are techniques used in one of the two systems which...
Article
This paper describes our participation in the ImagePhoto task at CLEF 2008. We present the joint work of two teams belonging to the TEXT-MESS project using a new system that combines the individual systems of these teams, one based on filtering and the other one based on clustering. We have submited experiments using SINAI filtering method with the...
Article
Full-text available
This paper describes the approach of the university of Alicante to the problem of finding a suitable handling of multimodal sources within the ImageCLEF ad-hoc competition. We have worked on to add modifications to the most common multimodal techniques used in the image retrieval area in order to improve their performance. Moreover, we have added a...
Conference Paper
Full-text available
This paper analyses an approach made to the development of a textual image retrieval system by the University of Alicante using IR-n, a text-based information retrieval (IR) system. With only a minimal amount of adaptations to the features of this task, our system has obtained precision results above the mean average of participants for ImageCLEF07...
Conference Paper
The paper describes our participation in monolingual tasks at CLEF 2006. We submitted results for the following languages: English, French, Portuguese and Hungarian. We focused on studying different weighting schemes (okapi and dfr) and retrieval strategies (passage retrieval and document retrieval) to improve retrieval performance. After an analys...
Conference Paper
Full-text available
Previous works on evaluating the performance of Question Answering (QA) systems are focused on the evaluation of the precision. In this paper, we developed a mathematic procedure in order to ex- plore new evaluation measures in QA systems considering the answer time. Also, we carried out an exercise for the evaluation of QA systems within a time co...
Conference Paper
Previous works on evaluating the performance of Question Answering (QA) systems are focused in the evaluation of the precision. Nevertheless, the importance of the answer time never has been evaluated. This paper studies the problem of the evaluation in QA systems, focusing on the way in which the time can be considered. Specifically, we carried ou...
Conference Paper
Full-text available
Nowadays there is a big amount of biomedical literature which uses complex nouns and acronyms of biological entities thus complicating the task of retrieval specific infor- mation. The Genomics Track works for this goal and this paper describes the approach we used to take part of this track of TREC 2007. As this is the first time we participate in...
Article
This paper describes an approach made to the development of a textual image retrieval system, by the university of Alicante using IR-n, a Information Retrieval (IR) text- based system. With only a minimal quantity of adaptations to the features of this task, our system has obtained precision results over the mean average of participants at ImageCLE...
Article
Full-text available
Previous works on evaluating the performance of Question Answering (QA) systems are focused in the evaluation of the precision. Nevertheless, the importance of the answer time never has been evaluated. In this paper, we developed a mathematic procedure in order to explore new evaluation measures in QA systems considering the answer time. Also, we c...
Conference Paper
Full-text available
Question Answering is a major research topic at the University of Alicante. For this reason, this year two groups participated in the QA@CLEF track using different approaches. In this paper we describe the work of Alicante 2 group. This paper describes AliQAn, a monolingual open-domain Question Answering (QA) System developed in the Department of L...
Conference Paper
A previous version of AliQAn participated in the CLEF 2005 Spanish Monolingual Question Answering task. For this year’s run, to the system are added new and representative patterns in question analysis and extraction of the answer. A new ontology of question types has been included. The inexact questions have been improved. The information retrieva...
Conference Paper
This paper studies the problem of filtering data in Passage Retrieval applied to Question Answering. Specifically, in this paper we have proved that the Mean-Value Theorem can play an important role to improve Question Answering. We have studied the way in which this theorem can be applied in order to produce a maximum data reduction without precis...
Article
An initial version of AliQAn participated in the CLEF-2005 Spanish Monolingual Ques- tion Answering task. AliQAn has been improved and it has better results than last year. The system ofiers new and representative patterns in question analysis and extraction of the answer. A new ontology of questions types has been included. The inexact questions h...
Conference Paper
Abstract This paper describes our participation in monolingual tasks at CLEF-2005. In this research we have worked in the following languages: English, French, Portuguese, Bulgarian and Hungarian. Our task has been focused on using combined dierent size passages to improve the Information Retrieval process. Once we have studied the experiments whic...
Conference Paper
In this paper, the new features that IR-n system applies on the topic processing for CL-SR are described. This set of features are based on applying logic forms to topics with the aim of incrementing the weight of topic terms according to a set of syntactic rules.
Conference Paper
Full-text available
This paper describes the participation of IR-n system at CLEF-2005. This year, we have participated in bilingual task (English-French and English-Portuguese) and multi-lingual task (English, French, Italian, German, Dutch, Finish and Swedish). At present conference, we have introduced the combined passages method for the bilingual task. Futhermore...
Conference Paper
Full-text available
For the participation of the University of Alicante in the first cross-language Geo-graphic Information Retrieval, we have developed a system made up of three modules. One of them is an Information Retrieval module and the others are Named Entity Recognition modules based on machine learning and based on knowledge. We have carried out several runs...
Conference Paper
Full-text available
The main topic of this paper is the context size needed for an ecient Interactive Cross-language Question Answering system. We compare two approaches: the first one (baseline system) shows user whole passages (maximum context: 10 sentences). The second one (experimental system) shows only a clause (minimum context). As cross-language system, the ma...
Conference Paper
This paper presents the first experiment done for the CLEF2005 WebCLEF Track. In the present work, we have focused our main efforts in the Spanish part of the Mixed Monolingual task, but we have also participated in several other languages tasks and in the Bilingual English-Spanish task. A passage-based IR system is applied in the retrieval phase....
Conference Paper
In a previous paper we proved that Named Entity Recognition plays an important role to improve Question Answering by both increasing the quality of the data and by reducing its quantity. Here we present a more in-depth discussion, studying several ways in which NER can be applied in order to produce a maximum data reduction. We achieve a 60% reduct...
Conference Paper
Full-text available
This paper presents the evaluation of a QA system for the treatment of complex temporal questions. The system was implemented in a multilayered architecture where complex temporal questions are first decomposed into simple questions, according to the temporal relations expressed in the original question. These simple questions are then processed in...
Conference Paper
One of the main differences between Spoken Document Retrieval (SDR) systems and Text Retrieval systems is the need of a segmentation process that detects the story boundaries. However, until now, SDR researchers have not paid attention in building correct segments more than considering slidding windows of a fixed size in time. In this paper, new me...
Conference Paper
This paper studies the use of Named Entity Recognition (NER) for the Question Anwering (QA) task in Spanish texts. NER applied as a preprocessing step not only helps to detect the answer to the question but also decreases the amount of data to be considered by QA. Our proposal reduces a 26% the quantity of data and moreover increases a 9% the effic...
Article
Full-text available
This paper presents the first experiment done for the CLEF2005 Multilingual Web Track. At present conference we have focused our main effort in the Spanish part of the Mixed Monolingual task, but we have also participated in others several languages and in the Bilingual English-Spanish task. A passage based IR system is applied at retrieving phase....
Conference Paper
This paper describes the architecture, operation and results obtained with the Question Answering prototype for Spanish developed in the Department of Language Processing and Information Systems at the University of Alicante for the CLEF-2004 Spanish monolingual QA evaluation task. Our system is based on the prototype developed for the CLEF-2003 Sp...
Conference Paper
Full-text available
The iCLEF 2004 experiment at the University of Alicante has focused on how to assist users when searching the correct answer in passages written in a language different from the one of the query. The language of the users is Spanish and the language of the documents/passages English. In order to help users, a first system shows, together with the p...
Conference Paper
This paper describes the fourth participation of the IR-n system (Alicante University) at the CLEF evaluation campaigns. For CLEF 2004, we modified our similarity measure and query expansion model. For the similarity measure, we now use normalization based on the number of words for each of the passages. We tested two different approaches for query...
Conference Paper
Passage Retrieval is an alternative to traditional document-oriented Information Retrieval. These systems use contiguous text fragments (or passages), instead of full documents, as basic unit of information. IR-n system is a passage retrieval system that uses groups of contiguous sentences as unit of information. This paper reports on a new archite...
Article
Full-text available
Open-Domain Question Answering systems (QA) performs the task of detecting text fragments in a collection of documents that contain the response to user's queries.
Conference Paper
This paper describes the first participation of IR-n system at Spoken Document Retrieval, focusing on the experiments we made before participation and showing the results we obtained. IR-n system is an Information Retrieval system based on passages and the recognition of sentences to define them. So, the main goal of this experiment is to adapt IR-...
Conference Paper
Full-text available
This paper describes the architecture, operation and results obtained with the Question Answering prototype for Spanish developed in the Department of Language Processing and Information Systems at the University of Alicante for the CLEF 2003 Spanish monolingual QA evaluation task. Our system has been fully developed from scratch and it combines sh...
Conference Paper
Full-text available
In this paper we will present the result of the interactive CLEF experiment at the University of Alicante. Our aim was to compare two interactive approaches: one based on passages (presented at the iCLEF 2002 (5)), and a new interactive approach based on syntactic semantic patterns. These patterns are composed by the main verb of a sentence plus it...
Conference Paper
Full-text available
This paper describes the third participation of the IR-n system (U. Alicante) in CLEF 2003. Two previous participations were focused on the Spanish monolingual task. This year, we participated in three different tracks: the multilingual track (four languages), the bilingual track (Italian-Spanish) and the monolingual track (Spanish, German, French,...
Article
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PhD Thesis in Computer Science written by Fernando Llopis Pascual under the supervision of Dr. José Luis Vicedo González and Dr. Antonio Ferrández Rodríguez (University of Alicante Spain). The author was examined in May 6th, 2003 by the commitee formed by Dr. Manuel Palomar Sanz (Univ. de Alicante), Alfonso Ureña López (Univ. de Jaén), Emilio Sanch...
Conference Paper
Full-text available
We present the results obtained at iCLEF-2002. This is the first time that we have participated in the iCLEF task, and we have used our Passage Retrieval approach (IR-n). This system previously divides the document in fragments or passages, and the similaxity of each passage with the query is then measured. Finally, the document that contains the m...
Conference Paper
Full-text available
Passage Retrieval is an alternative to traditional document-oriented Information Retrieval. These systems use contiguous text fragments (or passages) instead of full documents as the basic unit of information. The IR-n system is a passage retrieval system that uses groups of contiguous sentences as units of information. This paper reports on exper...
Conference Paper
Full-text available
En el presente artículo se presenta una aplicación web que permite a los alumnos resolver ejercicios planteados en la asignatura Fundamentos de la Programación de las titulaciones de Informática de la Universidad de Alicante. Esta aplicación se ha planteado a modo de "competición" o juego, con el fin de motivar al alumno a que realice una gran cant...
Conference Paper
Previous works in Information Retrieval show that using pieces of text obtain better results than using the whole document as the basic unit to compare with the user's query. This kind of IR systems is usually called Passage Retrieval (PR). However, there is not a general agreement about how one should define those pieces of text (also known as pas...
Conference Paper
Previous works in Information Retrieval show that using pieces of text obtain better results than using the whole document as the basic unit to compare with the user’s query. This kind of IR systems is usually called Passage Retrieval (PR). This paper discusses the use of our PR system in the question answering process (QA). Our main objective is t...
Conference Paper
Previous works in Information Retrieval show that using pieces of text obtain better results than using the whole document as the basic unit to compare with the user’s query. This kind of IR systems is usually called Passage Retrieval (PR). However, there is not a general agreement about how one should define those pieces of text (also known as pas...
Conference Paper
Full-text available
This paper describes the architecture, operation and results obtained with the Question Answeringprototype developed in the Department of Language Processing and Information Systems at theUniversity of Alicante. This system is based on our TREC-10 approach where differentimprovements have been introduced. Main modifications reside on the introducti...
Article
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Los sistemas de Búsqueda de Respuestas (BR) tienen como objetivo detectar pequeños fragmentos de texto de una colección que respondan una consulta concreta de un usuario. La complejidad de estos sistemas, dificulta que sean aplicado eficientemente a colecciones de gran tamaño. Por ello los sistemas de BR utilizan previamente sistemas de recuperació...
Article
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Trabajos previos demuestran que la utilización de fragmentos de documentos como unidad básica de información, para calcular la relevancia de un documento con respecto a una pregunta, mejora sensiblemente los resultados de los sistemas de recuperación de información. Sin embargo, no se ha llegado a un consenso acerca de cómo definir esos fragmentos...
Conference Paper
Previous work demonstrates that information retrieval system performance is sensibly improved when using document passages as the basic unit of information. However, the IR community has not yet arrived at consensus about the best way of defining text passages for retrieval purposes. This paper reports on experiments with the IR-n system, an inform...
Article
The supply of phenotyped red blood cells (RBC) for patients with several RBC antibodies presents a difficult task to hospital blood banks and regional blood centers. The aim of this study was to establish a low-cost typing system to allow extensive phenotyping of regular blood donors for clinically significant RBC antigens. We developed a new buffe...
Article
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RESUMEN. En este trabajo se presenta el sistema EXIT, una propuesta de un sistema de extracción de información capaz de obtener información estructurada a partir del contenido de escrituras de compra-venta. Este sistema tiene como objetivo el rellenar unas plantillas que son el reflejo del esquema lógico de una base de datos relacional, en la cuál...
Article
Serologic agglutination tests have the disadvantage of lack of an objective endpoint that can be easily read and quantitated. We have developed a new method for ABO and Rh typing based on producing a red blood cell (RBC) monolayer on microplates and the mixed hemagglutination reaction. We have employed a new red cell fixation buffer to prepare the...