Fernando Enríquez

article

Gonadic conditioning and maturation of the queen conch (Dosinia ponderosa) fed three microalgae at three temperatures

Emmanuel Villanueva‐Gutiérrez, Luis Fernando Enríquez‐Ocaña, José Antonio López‐Elias, María del Carmen Garza‐Aguirre, more

Aquaculture Nutrition > 25 > 1 > 88 - 96

Gonadic conditioning and maturation of queen clam Dosinia ponderosa fed three microalgae (Isochrysis galbana, Tetraselmis suecica and Chaetoceros calcitrans) at three temperatures (20, 25 and 30°C) were assessed. Histological analysis showed six gonadic stages, indicators of maturity. The evaluation included sex proportion, oocyte diameter and frequency of gonadic stages after 22 (middle of trial)...

article

Su1745 - Predictive Value of Fecal Hemoglobin Levels in Consecutive Rounds in a Population Screening Program for Colorrectal Cancer (CRC)

Laura Carot, Cristina Hernández, Josep M Augé, Maria Gonzalez, more

Gastroenterology > 2018 > 154 > 6(S1) > S-575-S-576

article

Chemical characterization and antioxidant activity of sulfated polysaccharides from Navicula sp.

Diana Fimbres-Olivarria, Elizabeth Carvajal-Millan, Jose Antonio Lopez-Elias, Karla Guadalupe Martinez-Robinson, more

Food Hydrocolloids > 2018 > 75 > C > 229-236

Sulfated polysaccharides were extracted from Navicula sp. cultivated at three wavelengths: white (WSPN), red (RSPN) and blue (BSPN) with yield rates of 3.4, 3.9 and 4.4 (% w/w dry biomass basis) respectively. Analysis of these polysaccharides using gas chromatography showed that they contain glucose, galactose, rhamnose, xylose and mannose as main neutral sugars. The amount of rhamnose was higher...

article

An approach to the use of word embeddings in an opinion classification task

Fernando Enríquez, José A. Troyano, Tomás López-Solaz

Expert Systems with Applications > 2016 > 66 > C > 1-6

In this paper we show how a vector-based word representation obtained via word2vec can help to improve the results of a document classifier based on bags of words. Both models allow obtaining numeric representations from texts, but they do it very differently. The bag of words model can represent documents by means of widely dispersed vectors in which the indices are words or groups of words. word2vec...

chapter

Processing of the results from educational forum of the virtual courses in order to analyze them: Making automatic reports from the log files

Luisa Maria Romero-Moreno, Fernando Enriquez de Salamanca Ros

2016 11th Iberian Conference on Information Systems and Technologies (CISTI) > 1 - 6

2016 11th Iberian Conference on Information Systems and Technologies (CISTI)

Methodology eLearning improves educational and promotes to share and collaborate. This work presents a way to analyze and automate log files from the educational forums in a course of virtual learning systems. We have developed a piece of software to process the logs files. Text reports and database files are produced. Then it is possible to study them and to obtain conclusions about the work of our...

chapter

Combining Textual Content and Hyperlinks in Web Spam Detection

F. Javier Ortega, Craig Macdonald, José A. Troyano, Fermín L. Cruz, more

Lecture Notes in Computer Science > Natural Language Processing and Information Systems > Posters > 266-269

In this work, we tackle the problem of spam detection on the Web. Spam web pages have become a problem for Web search engines, due to the negative effects that this phenomenon can cause in their retrieval results. Our approach is based on a random-walk algorithm that obtains a ranking of pages according to their relevance and their spam likelihood. We introduce the novelty of taking into account the...

chapter

Supervised TextRank

Fermín Cruz, José A. Troyano, Fernando Enríquez

Lecture Notes in Computer Science > Advances in Natural Language Processing > Research Papers > 632-639

In this paper we investigate how to adapt the TextRank method to make it work in a supervised way. TextRank is a graph based method that applies the ideas of the ranking algorithm used in Google (PageRank) to Natural Language Processing (NLP) tasks. This approach has given very good results in many NLP tasks like text summarization, keyword extraction or word sense disambiguation. In all these tasks...

chapter

TOES: A Taxonomy-Based Opinion Extraction System

Fermín L. Cruz, José A. Troyano, F. Javier Ortega, Fernando Enríquez

Lecture Notes in Computer Science > Natural Language Processing and Information Systems > Posters > 262-265

Feature-based opinion extraction is a task related to opinion mining and information extraction which consists of automatically extracting feature-level representations of opinions from subjective texts. In the last years, some researchers have proposed domain-independent solutions to this task. Most of them identify the feature being reviewed by a set of words from the text. Rather than that, we...

chapter

Named Entity Recognition Through Corpus Transformation and System Combination

José A. Troyano, Vicente Carrillo, Fernando Enríquez, Francisco J. Galán

Lecture Notes in Computer Science > Advances in Natural Language Processing > 255-266

In this paper we investigate the way of combining different taggers to improve their performance in the named entity recognition task. The main resources used in our experiments are the publicly available taggers TnT and TBL and a corpus of Spanish texts in which named entities occurrences are tagged with BIO tags. We have defined three transformations that provide us three additional versions of...

chapter

A Comparative Study of Classifier Combination Methods Applied to NLP Tasks

Fernando Enríquez, José A. Troyano, Fermín L. Cruz, F. Javier Ortega

Lecture Notes in Computer Science > Natural Language Processing and Information Systems > Posters > 258-261

There are many classification tools that can be used for various NLP tasks, although none of them can be considered the best of all since each one has a particular list of virtues and defects. The combination methods can serve both to maximize the strengths of the base classifiers and to reduce errors caused by their defects improving the results in terms of accuracy. Here is a comparative study on...

chapter

Applying Stacking and Corpus Transformation to a Chunking Task

José A. Troyano, Víctor J. Díaz, Fernando Enríquez, Vicente Carrillo, more

Lecture Notes in Computer Science > Computer Aided Systems Theory – EUROCAST 2005 > Intelligent Information Systems > 150-158

In this paper we present an application of the stacking technique to a chunking task: named entity recognition. Stacking consists in applying machine learning techniques for combining the results of different models. Instead of using several corpus or several tagger generators to obtain the models needed in stacking, we have applied three transformations to a single training corpus and then we have...

article

Physiological and sanitary condition of the white clam Dosinia ponderosa collected from a coastal area impacted by shrimp farm effluent

Marcel Martínez-Porchas, Susana Maria Scheuren-Acevedo, Luis Rafael Martínez-Córdova, Teresa Gollas-Galvan, more

Aquaculture International > 2016 > 24 > 1 > 243-256

White clams (Dosinia ponderosa) were collected near an effluent outlet of shrimp farms to measure the impact of the discharge. Clams were collected at 50, 150, and 300 m from the discharge area. Environmental parameters at each sampling site were determined and the physiological, stress, and health conditions of the clams were recorded. Water and sediment qualities were negatively affected by effluent...

article

A comparative study of classifier combination applied to NLP tasks

Fernando Enríquez, Fermín L. Cruz, F. Javier Ortega, Carlos G. Vallejo, more

Information Fusion > 2013 > 14 > 3 > 255-267

The paper is devoted to a comparative study of classifier combination methods, which have been successfully applied to multiple tasks including Natural Language Processing (NLP) tasks. There is variety of classifier combination techniques and the major difficulty is to choose one that is the best fit for a particular task. In our study we explored the performance of a number of combination methods...

article

‘Long autonomy or long delay?’ The importance of domain in opinion mining

Fermín L. Cruz, José A. Troyano, Fernando Enríquez, F. Javier Ortega, more

Expert Systems With Applications > 2013 > 40 > 8 > 3174-3184

Nowadays, people do not only navigate the web, but they also contribute contents to the Internet. Among other things, they write their thoughts and opinions in review sites, forums, social networks, blogs and other websites. These opinions constitute a valuable resource for businesses, governments and consumers. In the last years, some researchers have proposed opinion extraction systems, mostly domain-independent...

article

Propagation of trust and distrust for the detection of trolls in a social network

F. Javier Ortega, José A. Troyano, Fermín L. Cruz, Carlos G. Vallejo, more

Computer Networks > 2012 > 56 > 12 > 2884-2895

Trust and Reputation Systems constitute an essential part of many social networks due to the great expansion of these on-line communities in the past few years. As a consequence of this growth, some users try to disturb the normal atmosphere of these communities, or even to take advantage of them in order to obtain some kind of benefits. Therefore, the concept of trust is a key point in the performance...

article

Is the mangrove cockle Anadara tuberculosa a candidate for effluent bioremediation? Energy budgets under combined conditions of temperature and salinity

Mario Nieves-Soto, Fernando Enriquez-Ocaña, Pablo Piña-Valdez, Alfonso N. Maeda-Martínez, more

Aquaculture > 2011 > 318 > 3-4 > 434-438

To determine extreme and optimum temperature and salinity for growth in the mangrove cockle Anadara tuberculosa, we measured the scope for growth in adult cockles exposed to 16 treatments composed of combinations of four salinities (20, 30, 40, and 50psu) and four water temperatures (23, 26, 29, and 32°C). Higher clearance rates were recorded in cockles maintained at 30 and 40psu and 32°C. Consistently...

article

Re-organization of mitochondria at the NK cell immune synapse

Edgar Abarca-Rojano, Saé Muñiz-Hernández, María Maximina Bertha Moreno-Altamirano, Ricardo Mondragón-Flores, more

Immunology Letters > 2009 > 122 > 1 > 18-25

As part of the innate immune response NK cells destroy infected, transformed, or otherwise stressed cells within hours of activation. In contrast, CD4 ⁺ T lymphocytes require a sustained increase in their metabolism in order to cope with the biogenesis of cell components, in a process of proliferation and differentiation into effector cells.Recently, mitochondria have been implied in T lymphocyte...

article

Clarifying the semantics of value in use cases through Jackson's Problem Frames

José M. Cañete-Valdeón, Fernando Enríquez, Javier Ortega, Ernesto Veláquez

Information Processing Letters > 2008 > 107 > 6 > 221-229

Use cases constitute a popular technique to problem analysis, partly due to their focus on thinking in terms of the user needs. However this is not a guarantee for discovering all the subproblems that compose the structure of a given software problem. Moreover, a rigorous application of the technique requires a previous consensus about the meaning of I. Jacobson's statement “a use case must give a...

article

Natural evolution of carpal tunnel syndrome in untreated patients

Fernando Ortiz-Corredor, Fernando Enríquez, Jorge Díaz-Ruíz, Nixon Calambas

Clinical Neurophysiology > 2008 > 119 > 6 > 1373-1378

To describe the clinical and electrophysiological evolution of a group of patients diagnosed with carpal tunnel syndrome (CTS) who have not undergone any type of treatment (injections, braces or surgery).Clinical and electrophysiological monitoring was done consecutively in a series of patients who were admitted with a diagnosis of CTS. The average time for follow-up was 2 years. The Historic and...

article

Cardiac papillary fibroelastoma in left ventricular apex

María Margarita Company Campins, Ester Antón, Fernando Enríquez, Juan Palmer, more

Cardiovascular Pathology > 2007 > 16 > 5 > 317-319

Papillary fibroelastoma (PF) is a rare benign heart tumor and represents less than 10% of primary cardiac tumors. It mainly affects the cardiac valves and is often discovered during open heart surgery or autopsy. We present a case of a patient who was detected with a left ventricular apex tumor during the evaluation of the transient ischemic attack. The patient underwent surgery, and subsequently,...

INFONA - science communication portal

Search results for: Fernando Enríquez

Gonadic conditioning and maturation of the queen conch (Dosinia ponderosa) fed three microalgae at three temperatures

Su1745 - Predictive Value of Fecal Hemoglobin Levels in Consecutive Rounds in a Population Screening Program for Colorrectal Cancer (CRC)

Chemical characterization and antioxidant activity of sulfated polysaccharides from Navicula sp.

An approach to the use of word embeddings in an opinion classification task

Processing of the results from educational forum of the virtual courses in order to analyze them: Making automatic reports from the log files

Combining Textual Content and Hyperlinks in Web Spam Detection

Supervised TextRank

TOES: A Taxonomy-Based Opinion Extraction System

Named Entity Recognition Through Corpus Transformation and System Combination

A Comparative Study of Classifier Combination Methods Applied to NLP Tasks

Applying Stacking and Corpus Transformation to a Chunking Task

Physiological and sanitary condition of the white clam Dosinia ponderosa collected from a coastal area impacted by shrimp farm effluent

A comparative study of classifier combination applied to NLP tasks

‘Long autonomy or long delay?’ The importance of domain in opinion mining

Propagation of trust and distrust for the detection of trolls in a social network

Is the mangrove cockle Anadara tuberculosa a candidate for effluent bioremediation? Energy budgets under combined conditions of temperature and salinity

Re-organization of mitochondria at the NK cell immune synapse

Clarifying the semantics of value in use cases through Jackson's Problem Frames

Natural evolution of carpal tunnel syndrome in untreated patients

Cardiac papillary fibroelastoma in left ventricular apex

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