| 1. |
- Darányi, Sándor, et al.
(författare)
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A Physical Metaphor to Study Semantic Drift
- 2016
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Ingår i: Proceedings of SuCCESS-16, 1st International Workshop on Semantic Change & Evolving Semantics. - 9781450321389
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Konferensbidrag (refereegranskat)abstract
- In accessibility tests for digital preservation, over time we experience drifts of localized and labelled content in statistical models of evolving semantics represented as a vector field. This articulates the need to detect, measure, interpret and model outcomes of knowledge dynamics. To this end we employ a high-performance machine learning algorithm for the training of extremely large emergent self-organizing maps for exploratory data analysis. The working hypothesis we present here is that the dynamics of semantic drifts can be modeled on a relaxed version of Newtonian mechanics called social mechanics. By using term distances as a measure of semantic relatedness vs. their PageRank values indicating social importance and applied as variable ‘term mass’, gravitation as a metaphor to express changes in the semantic content of a vector field lends a new perspective for experimentation. From ‘term gravitation’ over time, one can compute its generating potential whose fluctuations manifest modifications in pairwise term similarity vs. social importance, thereby updating Osgood’s semantic differential. The dataset examined is the public catalog metadata of Tate Galleries, London.
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| 2. |
- Darányi, Sándor, 1951-, et al.
(författare)
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Communicating Semantic Content to Persons with Deafblindness by Haptograms and Smart Textiles : Theoretical Approach and Methodology
- 2020
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Ingår i: International Journal on Advances in Intelligent Systems. - 1942-2679. ; 13:1&2, s. 103-113
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Tidskriftsartikel (refereegranskat)abstract
- By means of a proof-of-concept prototype, which is work in progress, we adopted a multidisciplinary approach to develop a smart-textile-based communication system for use by people with deafblindness. In this system, sensor technologies and computer vision are used to detect environmental cues such as presence of obstacles, faces, objects, etc. Focusing on the communication module here, a new ontology connects visual analytics with the user to label detected semantic content about objects, persons and situations for navigation and situational awareness. Such labelled content is then translated to a haptogram vocabulary with static vs. dynamic patterns, which are mapped to the body. A haptogram denotes a tactile symbol composed over a touchscreen, its dynamic nature referring to the act of writing or drawing. A vest made of smart textile, in the current variant equipped with a 4 x 4 grid of vibrotactile actuators, is used to transmit haptograms on the user’s back. Thereby system messages of different complexity -- both alerts and short sentences -- can be received by the user, who then has the option to respond by pre-coded questions and messages. By means of grids with more actuators, displays with higher resolution can be implemented and tested, paving the way for an extended haptogram vocabulary, covering more detailed ontology content.
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| 3. |
- Darányi, Sándor, 1951-, et al.
(författare)
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Static and Dynamic Haptograms to Communicate Semantic Content : Towards Enabling Face-to-Face Communication for People with Deafblindness
- 2019
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Ingår i: ThinkMind// SEMAPRO, International Conference on Advances in Semantic Processing. - Porto, Portugal : International Academy, Research and Industry Association (IARIA). - 9781612087382
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Konferensbidrag (refereegranskat)abstract
- Based on the ontology developed in the ongoing SUITCEYES EU-funded project to bridge visual analytics for situational awareness and navigation with semantic labelling of environmental cues, we designed a set of static and dynamic haptograms to represent concepts for two-way communication between deafblind and non-deafblind users. A haptogram corresponds to a tactile symbol drawn over a touchscreen, its dynamic nature referring to the act of writing or drawing, where the touchscreen can take several forms, including a smart textile screen designated for specific areas on the body. In its current version, our haptogram set is generated over a 4 x 4 matrix of cells and is displayed on the back of the user, tested for robustness at the receiving end. The concepts and concept sequences simulating simple questions and answers represented by haptograms are focused on ontology content for now but can be scaled up.
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| 4. |
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Internet Science : Proceedings
- 2017
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Proceedings (redaktörskap) (refereegranskat)abstract
- This book constitutes the proceedings of the 4th International Conference on Internet Science held in Thessaloniki, Greece, in November 2017. The 34 papers presented were carefully reviewed and selected for inclusion in this volume. They were organized in topical sections named: next generation community engagement; online policy, politics and co-creation; understanding and empowering digital citizens; data-driven research and design; social media and online interaction.
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| 5. |
- Karunaratne, Thashmee, 1968-, et al.
(författare)
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A Canonical Evidence-based Approach for Semantic Interoperability in Cross-border and Cross-domain e-Government Services
- 2022
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Ingår i: ICEGOV '22. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450396356 ; , s. 131-139, s. 131-139
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Konferensbidrag (refereegranskat)abstract
- This paper demonstrates a proof of concept for cross-border information exchange guided by the single digital gateway regulation (SDGR) and once-only principle (OOP). The research systematically investigates the challenges and limitations of existing solutions for semantic interoperability. Furthermore, the concept of canonical evidence is introduced as a tool for the cross-border exchange of structured data automatically with less ambiguity and in compliance with the legal requirements of the selected public services. A design science research approach in an agile set-up is applied in the artefact (canonical evidences) development process. The requirements are elicited based on eight case studies set up in the context of the EU initiative, Digital Europe for all (De4a). The data models developed in this study are in compliance with the requirements and provisions of a selected set of EU member states. The outcome of the study includes eleven evidence types that could be reusable in executing procedures of respective e-Government services.
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| 6. |
- Karunaratne, Thashmee, 1968-, et al.
(författare)
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Supporting Learning Mobility With Student Data Harmonisation : A European Perspective
- 2022
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Ingår i: Proceedings of the 21st European Conference on e-Learning ECEL 2022. - : Academic Conferences International (ACI). ; , s. 156-164, s. 156-164
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Konferensbidrag (refereegranskat)abstract
- Digitalisation promotes online education, internationalisation and student mobility. Based on the Bologna process and the European higher education area, learning mobility has been successful under Erasmus and other similar initiatives. However, a key issue for students and universities is that a significant amount of time is spent on the manual labour involved in the process of applying to degree programs overseas. It is therefore essential for higher education institutions to better exploit the potential of technology and Web 2.0 to enable a secure exchange of evidence during application for degree programs and academic courses in foreign Higher Education Institutions, as well as applying for study grants and obtaining recognition for academic and other types of studies. Harmonisation of the student data is a key initial step for enabling such exchange. In this study, an approach to a secured exchange of education evidence is instrumented under the H2020 project Digital Europe for All (DE4A). Existing semantic standards for Web 2.0 applications, core vocabularies for public service data and semantic assets from existing best practices such as W3C, ISA2 core vocabularies, and Europass data model are used to curate data models that allow the exchange of a higher education diploma, secondary education diploma and information of special needs (disability, large family), which is required by students when requesting study grants (waive of tuition fees). The semantic interoperability agreements are established cross-border through these data models called canonical evidences. The canonical evidences are tested with the national data services of three countries, Portugal, Slovenia, and Spain. The final data models are implemented in XML Schema format that could be used by any educational organisation intending to use trusted public service databases within Europe to automatically retrieve information on students’ degrees. The validity of the canonical evidences is tested on two pilot occasions within the DE4A project. The outcome of this study summarises the procedural requirements for evidences when applying for a higher degree program and seeking grants. Furthermore, it resulted in verified canonical evidence data models that fulfil the procedural requirements for applying for studying abroad.
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| 7. |
- Kontopoulos, Efstratios, et al.
(författare)
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PERICLES Deliverable 4.4: Modelling Contextualised Semantics
- 2016
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Rapport (refereegranskat)abstract
- The current deliverable summarises the work conducted within task T4.4 of WP4, presenting our proposed models for semantically representing digital content and its respective context – the latter refers to any information coming from the environment of the digital object (DO) that offers a better insight into the object’s status, its interrelationships with other content items and information about the object’s context of use. Within PERICLES, we refer to the content semantics enriched with the contextual perspective as “contextualised semantics”. The deliverable presents two complementary modelling approaches, based respectively on (a) ontologies and logics, and, (b) multivariate statistics.
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| 8. |
- Kontopoulos, Efstratios, et al.
(författare)
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Studying the Cohesion Evolution of Genes Related to Chronic Lymphocytic Leukemia Using Semantic Similarity in Gene Ontology and Self-Organizing Maps
- 2016
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Ingår i: Proceedings of SWAT4LS-16, 9th International Conference on Semantic Web Applications and Tools for Life Sciences.
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Konferensbidrag (refereegranskat)abstract
- A significant body of work on biomedical text mining is aimed at uncovering meaningful associations between biological entities, including genes. This has the potential to offer new insights for research, uncovering hidden links between genes involved in critical pathways and processes. Recently, high-throughput studies have started to unravel the genetic landscape of chronic lymphocytic leukemia (CLL), the most common adult leukemia. CLL displays remarkable clinical heterogeneity, likely reflecting its underlying biological heterogeneity which, despite all progress, still remains insufficiently characterized and understood. This paper deploys an ontology-based semantic similarity combined with self-organizing maps for studying the temporal evolution of cohesion among CLL-related genes and the extracted information. Three consecutive time periods are considered and groups of genes are derived therein. Our preliminary results indicated that our proposed gene groupings are meaningful and that the temporal dimension indeed impacted the gene cohesion, leaving a lot of room for further promising investigations.
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| 9. |
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| 10. |
- Pastor-Sánchez, Juan-Antonio, et al.
(författare)
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Expressing Significant Others by Gravitation in the Ontology of Greek Mythology
- 2022
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Ingår i: Metadata and Semantic Research. - Cham : Springer International Publishing. ; , s. 224-235
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Konferensbidrag (refereegranskat)abstract
- To help close the gap between folksonomic knowledge vs. digital classical philology, based on a perceived analogy between Newtonian mechanics and evolving semantic spaces, we tested a new conceptual framework in a specific domain, the Ontology of Greek Mythology (OGM). The underlying Wikidata-based public dataset has 5377 entities with 289 types of relations, out of which 34 were used for its construction. To visualize the influence structure of a subset of 771 divine actors by other means than the force-directed placement of graph nodes, we expressed the combination of semantic relatedness plus objective vs. relative importance of these entities by their gravitational behaviour. To that end, the metaphoric equivalents of distance, mass, force, gravitational potential, and gravitational potential energy were applied, with the latter interpreted as the structuration capacity of nodes. The results were meaningful to the trained eye, but, given the very high number of contour maps and heatmaps available by our public tool, their systematic evaluation lies ahead.
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