M. Ángel Sicilia

M. Ángel Sicilia
University of Alcalá | UAH

About

342
Publications
75,638
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4,161
Citations
Citations since 2017
50 Research Items
1400 Citations
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2017201820192020202120222023050100150200250

Publications

Publications (342)
Article
Full-text available
Steganography is the set of techniques aiming to hide information in messages as images. Recently, stenographic techniques have been combined with polyglot attacks to deliver exploits in Web browsers. Machine learning approaches have been proposed in previous works as a solution for detecting stenography in images, but the specifics of hiding explo...
Chapter
Blockchain technologies have demonstrated the potential to build decentralized finance (DeFi) protocols that are composable and interoperable. One of the envisioned applications of blockchains is that of becoming a platform for markets of greenhouse-gas emissions. KlimaDAO is one of the recently launched protocols that attempts to bridge existing v...
Book
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This book constitutes selected and revised papers presented at the First International Conference on Electronic Governance with Emerging Technologies, EGETC 2022, held in Tampico, Mexico, in September 2022. The 15 full papers and 2 short papers presented were thoroughly reviewed and selected from the 54 submissions. This volume focuses on the rec...
Book
Full-text available
This book constitutes the proceedings of the 4th Iberoamerican Conference and third Indo-American Conference on Knowledge Graphs and Semantic Web, KGSWC 2022, which took place in Madrid, Spain, in November 2022. The 22 full and 3 short research papers presented in this volume were carefully reviewed and selected from 63 submissions. The papers cov...
Chapter
Language models (LMs) trained or large text corpora have demonstrated their superior performance in different language related tasks in the last years. These models automatically implicitly incorporate factual knowledge that can be used to complement existing Knowledge Graphs (KGs) that in most cases are structured from human curated databases. Her...
Chapter
This chapter discusses prospects for the measurement of quantum software artifacts and processes, describing initial directions and reviewing the scattered and scarce literature on the topic. It examines potential differences and commonalities of classical and quantum software in the context of measurement and identifies future research directions...
Article
The Semantic Web in general and the Linked Open Data Initiative, in particular, are a growing movement for organisations to make their existing data available in a machine-readable format. Thus, institutions are highly encouraged to publish, share and interlink their data publicly. The more data are opened on the Web (Open Data), the more integrate...
Article
Full-text available
Uncovering community structure has made a significant advancement in explaining, analyzing, and forecasting behaviors and dynamics of networks related to different fields in sociology, criminology, biology, medicine, communication, economics, and academia. Detecting and clustering communities is a powerful step toward identifying the structural pro...
Chapter
As the field of online learning unfolds, ample research opportunities are provided to understand emerging learning networks, the learning environment, and learners’ behaviour. Here are some interesting research directions:
Chapter
In this chapter, we investigated the detected communities and users using different social network analysis (SNA) measures and techniques. We assessed the effectiveness of the emerged learning communities, and we investigated the users’ interactions with the instructional videos. We attempted to evaluate the structural significance and learners’ be...
Chapter
In this chapter, we investigated the gathered data using different descriptive analysis including growth analysis, demographics, and interactions analysis to describe the learning repository and present the data in a meaningful manner that gives indication and useful insights regarding its growth, its features, and the characteristics of its users.
Chapter
This research was prepared and developed according to Creswell’s framework (Creswell, 2003) for research design which outlines characteristics of quantitative method research approach. This approach includes problem statement, hypothesis formation, literature review, and quantitative data analysis. According to Creswell, the quantitative research i...
Chapter
This chapter presents how we gathered data from an online learning repository which is Khan Academy. Here we discuss the tools used to create the database, scrap the repository, clean the data, and draw the network graph. The gathered data included subjects, topics, articles, exercises, instructional videos, and users’ interactions. All the gathere...
Chapter
This chapter presents different community detection techniques applied to our network graph to detect the emergent learning communities. We compared between the performance, goodness, and effectiveness of the selected algorithms as each method is based on a different principle and applies different technique in identifying learning communities.
Chapter
The main objective of our research revolves around exploring online learning repositories and analysing their characteristics. It also aimed to assess and study users’ interactions with those repositories and examine their patterns to detect emergent online communities and understand their properties. We intended to investigate the repositories, ex...
Chapter
Nowadays, as we are facing unprecedented times and almost 300 million students suffer from educational disruption, online learning becomes a genuine necessity. Many research efforts attempted to define online learning and focus on its main features. Data science methods and specifically social network analysis (SNA) techniques can play a powerful r...
Article
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The publication of large amounts of open data is an increasing trend. This is a consequence of initiatives like Linked Open Data (LOD) that aims at publishing and linking data sets published in the World Wide Web. Linked Data publishers should follow a set of principles for their task. This information is described in a 2011 document that includes...
Article
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Traceability is considered a key requirement for trustworthy artificial intelligence (AI), related to the need to maintain a complete account of the provenance of data, processes, and artifacts involved in the production of an AI model. Traceability in AI shares part of its scope with general purpose recommendations for provenance as W3C PROV, and...
Chapter
Ontologies or databases describing occupations in terms of competences or skills are an important resource for a number of applications. Exploiting large knowledge graphs thus becomes a promising direction to update those ontologies with entities of the latter, which may be updated faster, especially in the case of crowd-sourced resources. Here we...
Article
Full-text available
The length of hospital stay and its implications have a significant economic and human impact. As a consequence, the prediction of that key parameter has been subject to previous research in recent years. Most previous work has analysed length of stay in particular hospital departments within specific study groups, which has resulted in successful...
Article
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Background In recent years new forms of syndromic surveillance that use data from the Internet have been proposed. These have been developed to assist the early prediction of epidemics in various cases and diseases. It has been found that these systems are accurate in monitoring and predicting outbreaks before these are observed in population and,...
Book
This book addresses the need to explore user interaction with online learning repositories and the detection of emergent communities of users. This is done through investigating and mining the Khan Academy repository; a free, open access, popular online learning repository addressing a wide content scope. It includes large numbers of different lear...
Chapter
A considerable number of high-level quantum programming languages have been proposed and implemented in the last years. This fact opens the possibility to study the structure of the source code of quantum software, using initially the same metrics typically used in classical software. Here we report a preliminary study in module structure and use o...
Chapter
Data aggregators can leverage personal data for the benefit of their users in their role of mediators with enterprises that are willing to target qualified user segments with customized offerings. However, such type of transaction must comply with personal data protection regulation and provide a fair and auditable context for business partners. In...
Article
Free and open source software package ecosystems have existed for a long time, but such collaborative development practice has surged in recent years. One of the oldest and most popular package ecosystems is Comprehensive R Archive Network (CRAN), the repository of packages of the statistical language R, a popular statistical computing environment....
Article
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Twitter is undoubtedly one of the most widely used data sources to analyze human communication. The literature is full of examples where Twitter is accessed, and data are downloaded as the previous step to a more in-depth analysis in a wide variety of knowledge areas. Unfortunately, the extraction of relevant information from the opinions that user...
Article
The rapid growth of instructional videos repositories and their widespread use as a tool to support education have raised the need of studies to assess the quality of those educational resources and their impact on the quality of learning process that depends on them. Khan Academy (KA) repository is one of the prominent educational videos’ reposito...
Article
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Internet technologies have demonstrated their value for the early detection and prediction of epidemics. In diverse cases, electronic surveillance systems can be created by obtaining and analyzing on-line data, complementing other existing monitoring resources. This paper reports the feasibility of building such a system with search engine and soci...
Article
The rapid development of online learning networks has resulted in the widespread use of recorded educational contents. While the community structure of those networks may have an influence on the use of contents, research on detecting online learning communities and investigating their structures using social network analysis (SNA) methods is scarc...
Chapter
The widespread of data science programming languages and libraries have raised new interest in teaching computational science coding in ways that leverage the capabilities of both single-computer and cluster-based computation infrastructures. Some of the programming patterns and idioms are converging, yet there are specialized uses and cases that r...
Article
Teams can be defined by their interactions and successful performance rests on their members' behaviour. Although this topic has been studied both in sports and management, research on computer mediated team interactions, communication, cooperative work and efficiency in online competitive environments is scarce. In this article, networks will be u...
Article
Emergency response and management requires the coordination of agencies and different services in a complex evolving situation. This in turn, requires diverse models representing detailed knowledge about the types of adverse events, their potential impact and the means and resources that are best suited for an effective response. The basic formal i...
Article
Full-text available
Persistent Identifier (PID) systems have evolved in the last decade to mitigate the problem of link rot and provide unique and resolvable identifiers for digital objects, becoming a key element in archival services. However, they still depend on centralized services which may either become unavailable or cease to behave or be managed as expected. D...
Chapter
Advanced in technologies for the decentralization of applications have enabled micro-grid energy systems that do not rely on central control and optimization but are controlled by their owners. This may eventually enable consumers or intermediaries to specify concrete and diverse conditions on the supply that not only concern throughput, price and...
Chapter
Ontologies are usually applied to drive intelligent applications and also as a resource for integrating or extracting information, as in the case of Natural Language Processing (NLP) tasks. Further, ontologies as the Gene Ontology (GO) are used as an artifact for very specific research aims. However, the value of ontologies for data analysis tasks...
Article
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Nowadays there is a huge number of learning resources, covered different digital skills, on the Internet. In the framework of European Erasmus+ project: ‘Digital Skills Accelerator’ we developed dedicated to digital skills set of learning resources. Moreover, the test to analyses the level of user digital skills in form of the Online Self-Assessmen...
Article
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Institutions in higher education (HE) continuously strive to develop and deliver impactful educational programs. At the same time, they should continue to fulfill their mission to educate students in basic applied subjects and in parallel respond to the need to equip students with new skills. For this reason, higher education institutions (HEI) per...
Conference Paper
Digital skills are key enablers in a wide spectrum of jobs that require the use of digital tools for information search, communication and problem-solving. The interest on digital skills training has resulted in frameworks and offerings at different educational levels. However, there is a limited understanding on the relative importance of these sk...
Conference Paper
Problem-based learning has been proved as a good method to teach Software Engineering, concretely when project development skills are involved. In those cases, project work departs from some stakeholder requirements that are often ill-defined, and the team progresses by analysis and design identifying the parts that the team can develop and which o...
Article
Purpose The purpose of this paper is to employ the case of Organization for Economic Cooperation and Development (OECD) data repositories to examine the potential of blockchain technology in the context of addressing basic contemporary societal concerns, such as transparency, accountability and trust in the policymaking process. Current approaches...
Article
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The integration of quality in Higher Education is multidimensional. Higher Education administration, programs, procedures and evaluation provide the context for the application and diffusion of quality metrics. Our research intends to provide a holistic discussion on Key Performance Indicators (KPIs) related to quality in Higher Education. The anal...
Article
While video games provide different Player Experiences (PE), some genres can provide particularly unique PEs driven by their particular features. Such is the case of MOBA (Multiplayer Online Battle Arena) games, currently led in number of players and popularity by League of Legends. In spite of this popularity, PE in MOBA games remains largely unex...
Article
Full-text available
The increasing concern for the availability of scientific data has resulted in a number of initiatives promoting the archival and curation of datasets as a legitimate research outcome. Among them, dataset repositories fill the gap of providing long-term preservation of diverse kinds of data along with its meta-descriptions, and support citation. Un...
Article
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Background: An extended discussion and research has been performed in recent years using data collected through search queries submitted via the Internet. It has been shown that the overall activity on the Internet is related to the number of cases of an infectious disease outbreak. Objective: The aim of the study was to define a similar correla...
Conference Paper
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Metadata repositories and services support the key functions required by the curation of digital resources, including description, management and provenance. They typically use conventional databases owned and managed by different kinds of organizations that are trusted by their users. Blockchains have emerged as a means to deploy decentralized dat...
Article
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Wiktionary is an online collaborative project based on the same principle than Wikipedia , where users can create, edit and delete entries containing lexical information. While the open nature of Wiktionary is the reason for its fast growth, it has also brought a problem: how reliable is the lexical information contained in every article? If we are...
Conference Paper
Intrusion detection relies on the analysis of flows of network and system events that are checked against signatures or models of normality to raise alerts. However, these alerts are often the result of having detected a single step in the unfolding sequence of activities of an attacker, and techniques relying on simple alerting fall short in recog...
Conference Paper
Linked Open Data (LOD) is a method of publishing machine-readable open data so that it can be interlinked and become more useful through semantic querying. The decentralized nature of the current LOD cloud relies on location-specific services, which is known to result in problems of availability and broken links. Current approaches to peer-to-peer...
Article
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The increase of Linked Open Data (LOD) usage has grown in the last few years, and the number of datasets available is considerably higher. Taking this into account, another way to make data available is microdata, whose aim is to make information more understandable for search engines to give better results. The Schema.org vocabulary was created fo...
Conference Paper
Full-text available
Collaborative Filtering can be used in the context of e-learning to recommend learning objects to students and teachers involved with the teaching and learning process. Although such technique presents a great potential for e-learning, studies related to this application in this field are still limited, mostly because the inexistence of available d...
Article
Exposing eLearning objects on the Web of Data leads to sharing and reusing of educational resources and improves the interoperability of data on the Web. Furthermore, it enriches e-learning content, as it is connected to other valuable resources using the Linked Data principles. This paper describes a study performed on the Organic.Edunet repositor...
Article
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Linking a learning dataset to useful information on the Web of Data enriches its learning resources, as it enhances learners’ knowledge. This enrichment is usually achieved by creating links between datasets using the interlinking tools, which facilitate connecting any kind of data in a semi-automatic manner. This paper evaluates the interlinking r...
Conference Paper
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The needs of global science have fostered open access to the results and contextual information of research organizations at an international scale. This requires the use of standards or shared data models to exchange information preserving its semantics when transferred between systems. In that direction, standards as CERIF or projects as VIVO wer...
Article
Open textbook initiatives have appeared as an alternative to traditional publishing. These initiatives for the production of alternatively copyrighted educational resources provide a way of sharing materials through the Web.While the open model of peer-produced materials enables the global reuse of textbooks, the combination of fragments to produce...
Article
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Linked open data allow interlinking and integrating any kind of data on the web. Links between various data sources play a key role insofar as they allow software applications (e.g., browsers, search engines) to operate over the aggregated data space as if it was a unique local database. In this new data space, where DBpedia, a data set including s...
Article
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The rise and widespread use of Linked Data has encouraged data providers to publish and link their content in order to classify and organize information in a useful fashion. Interlinking between datasets enhances data navigation and facilitates searching. As a result, the use of interlinking tools as a way of connecting data items to the Linked Ope...
Chapter
It is known that current Learning Object Repositories adopt strategies for quality assessment of their resources that rely on the impressions of quality given by the members of the repository community. Although this strategy can be considered effective at some extent, the number of resources inside repositories tends to increase more rapidly than...
Article
Software Process Improvement (SPI) activities aim at driving change in information technology development towards increased quality and productivity levels. The SPI Manifesto describes the key values and principles for a successful implementation of SPI. About two-thirds of its principles relate to human, social, and organizational aspects and one-...
Chapter
The value and cost of metadata are highly dependent on the functions enabled by metadata inside systems and organizations. As the number of functions and the kinds of organizations that typically create and use metadata are extremely diverse, valuing and cost-justifying metadata turn out to be a difficult and multi-faceted task which involves sever...
Article
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Automation or semi-automation of learning scenario specifications is one of the least explored subjects in the e-learning research area. There is a need for a catalogue of learning scenarios and a technique to facilitate automated retrieval of stored specifications. This requires constructing an ontology with this goal and is justified in this pape...
Chapter
Knowledge management (KM) can be defined as “identifying and leveraging the collective knowledge in an organization to help the organization compete” (Alavi and Leidner, 2001). Knowledge is often considered the most valuable resource in any organization (Teece, 1998) because the expertise and innovative capacities of employees represent the only re...
Conference Paper
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Many knowledge organizations and digital repositories have leveraged different software to manage their taxonomies and thesauri. However, some of them do not have enough technical knowledge or experts to create complex structure e.g., OWL. On the other side, SKOS, as a simple language for classifying the knowledge organization systems e.g., thesaur...
Conference Paper
Full-text available
With the proliferation of educational materials on the Web of Data, interlinking learning resources has become an important issue nowadays. Interlinking datasets over Linked Open Data (LOD) enables enriching, enhances navigation, facilitates casual discovery, and improves resource seeking. To this aim, many tools, approaches and frameworks have bee...
Article
In the area of eLearning the automation of processes from their specifications is still unfeasible. The reason may be the lack of standards and specifications to specify learning processes unambiguously. The work presented in this paper try to solve such problem with two main contributions: the creation of a OKI-OSID metamodel to specify learning p...
Book
Although the standards in electronic health records and general healthcare services continue to evolve, many organizations push to connect interoperability with public service and basic citizenship rights. This poses significant technical and organizational challenges that are the focus of many research and standardization efforts. Interoperabilit...
Book
Full-text available
Opening up the access to scientific information is an increasing demand and crucial need for researchers and also for all citizens, communities and societies: VOA3R, the European initiative for the Virtual Open Access Agriculture & Aquaculture Repository, has established the online platform connecting digital libraries and facilitating virtual comm...
Conference Paper
A large number of curated digital collections containing learning resources of a various kind has emerged in the last year. These include referatories containing descriptions for resources in the Web (as MERLOT), aggregated collections (as Organic.Edunet), concrete initiatives as Khan Academy, repositories hosting and versioning modular content (as...
Article
Collaborative filtering (CF) algorithms are techniques used by recommender systems to predict the utility of items for users based on the similarity among their preferences and the preferences of other users. The enormous growth of learning objects on the internet and the availability of preferences of usage by the community of users in the existin...
Article
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Beyond the kind of processes dealt with the IMS LD specification, there are other kinds of processes, which are repeated periodically in learning environments that have not already been described yet due to the lack of mechanisms to describe them effectively. Inspired by the standard specification of language processes in the business area and taki...
Chapter
Achieving semantic interoperability between heterogeneous healthcare systems and integrating clinical guidelines in the automatic decision support of healthcare institutions are two key priorities of current medical informatics. They can lead to a significant improvement on patient safety by reducing medical risks and delays in diagnosis, facili...
Article
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The use ofKnowledgeOrganizationSystems (KOS) as ontologies or terminologies forthedescriptionof scholarly contents requires a careful consideration ofthedomain and the KOS available. KOS inthe same domain may differ in several dimensions including purpose, level of formality, structure and language. In consequence, curators of scientific data face...
Article
Massively Multiuser On-line Learning (MMOL) Platforms, often called “virtual learning worlds”, constitute a still unexplored context for communication-enhanced learning, where synchronous communication skills in an explicit social setting enhance the potential of effective collaboration. In this paper, we report on an experimental study of collabor...
Article
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As the amount of learning objects is rapidly growing inside the existing repositories, there is an urgent need to create new approaches for evaluating their quality without relying only on human work. The availability of evaluative metadata inside some repositories has opened the possibility of contrasting intrinsic features of the resources in ord...
Conference Paper
Assessing quality of learning resources is a difficult and complex task that often revolve around multiple and different aspects that must be observed. In order to evaluate quality, it is necessary to consider the particular spectrum of users and the particular set of criteria used by these users to value the resources. Existing approaches for asse...
Article
The notion of competency provides an observable account of concrete human capacities under specific work conditions. The fact that competencies are subject to concrete kinds of measurement entails that they are subject to some extent to comparison and even in some sense, calculus. Then, competency models and databases can be used to compute compete...
Article
Achieving continuous innovation in organizations requires a balance between exploiting yet acquired knowledge and exploring new knowledge. In addition to having the adequate resources, change and innovation capabilities require specific management support and organizational structures. Recent research has pointed out the importance of social networ...
Article
Corporate social responsibility (CSR) is a set of principles and practices that encourages companies to be responsibile for the impact that their activities have on society. CSR positions are publicly communicated through information usually made available through corporate Web sites. Previous studies have shown that these are heterogeneous in the...
Article
Instructional design theories are design theories that offer explicit guidance on how to help people to learn in specific situation. They can be used to guide the design of learning activities and the arrangement of associated resources. These theories are currently expressed in natural language, but they are often given some structure in terms of...
Conference Paper
Institutional repositories (IR) and Current Research Information Systems (CRIS) among other kinds of systems store and manage information on the context in which research activity takes place. Several models, standards and ontologies have been proposed to date as a solution to give coherent semantics to research information. These present a large d...