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Darányi, Sándor
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Publications (10 of 63) Show all publications
Darányi, S., Olson, N., Riga, M., Kontopoulos, E. & Kompatsiaris, I. (2019). Static and Dynamic Haptograms to Communicate Semantic Content: Towards Enabling Face-to-Face Communication for People with Deafblindness. In: Tim vor der Brück, Efstratios Kontopoulos (Ed.), ThinkMind// SEMAPRO, International Conference on Advances in Semantic Processing: . Paper presented at SEMAPRO 2019, The Thirteenth International Conference on Advances in Semantic Processing, Porto, September 22-26, 2019.. Porto, Portugal: International Academy, Research and Industry Association (IARIA)
Open this publication in new window or tab >>Static and Dynamic Haptograms to Communicate Semantic Content: Towards Enabling Face-to-Face Communication for People with Deafblindness
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2019 (English)In: ThinkMind// SEMAPRO, International Conference on Advances in Semantic Processing / [ed] Tim vor der Brück, Efstratios Kontopoulos, Porto, Portugal: International Academy, Research and Industry Association (IARIA), 2019Conference paper, Published paper (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
Porto, Portugal: International Academy, Research and Industry Association (IARIA), 2019
Keywords
deafblind communication; conceptual haptograms; word and sentence semantics; ontology.
National Category
Engineering and Technology
Research subject
Library and Information Science
Identifiers
urn:nbn:se:hb:diva-22588 (URN)978-1-61208-738-2 (ISBN)
Conference
SEMAPRO 2019, The Thirteenth International Conference on Advances in Semantic Processing, Porto, September 22-26, 2019.
Projects
SUITCEYES
Note

This paper received a best paper award: https://suitceyes.eu/wp-content/uploads/2019/11/semapro2019_a2-1.pdf

Available from: 2020-01-17 Created: 2020-01-17 Last updated: 2020-01-23Bibliographically approved
Kiraly, L., Kiraly, B., Szigeti, K., Tamas, C. Z. & Darányi, S. (2019). Virtual museum of congenital heart defects: digitization and establishment of a database for cardiac specimens.. Quantitative imaging in medicine and surgery, 9(1), 115-126
Open this publication in new window or tab >>Virtual museum of congenital heart defects: digitization and establishment of a database for cardiac specimens.
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2019 (English)In: Quantitative imaging in medicine and surgery, ISSN 2223-4292, Vol. 9, no 1, p. 115-126Article in journal (Refereed) Published
Abstract [en]

Education and training of morphology for medical students, and professionals specializing in pediatric cardiology and surgery has traditionally been based on hands-on encounter with congenitally malformed cardiac specimens. Large international archives are no longer widely available due to stricter data protection rules, a reduced number of autopsies, attrition rate of existing specimens, and most importantly due to a higher survival rate of patients. Our Cardiac Archive houses about 400 cardiac specimens with congenital heart disease. The collection spans almost 60 years and thus goes back to pre-surgical era. Unfortunately, attrition rate due to desiccation has led to an increased natural decay in recent years. The present multi-institutional project focuses on saving the collection by digitization. Specimens are scanned by high-resolution micro-CT/MRI. Virtual 3D-models are segmented and a comprehensive database is built. We now report an initial feasibility study with six test specimens that provided promising results, however, adequate presentation of the intracardiac anatomy, including septa and cardiac valves requires further refinements. Computer assisted design methods are necessary to overcome consequences of pathological examination, shrinkage and/or distortion of the specimens. For a next step, we anticipate an expandable web-based virtual museum with interactive reference and training tools. Web access for professional third parties will be provided by registration/subscription. In a future phase, segmental wall motion data could be added to virtual models. 3D-printed models may replace actual specimens and serve as hands-on surgical training to elucidate complex morphologies, promote surgical emulation, and extract more accurate procedural knowledge based on such a collection.

Keywords
Congenital abnormalities, anatomic, imaging, three-dimensional, interactive learning, models, multimodal imaging
National Category
Cardiac and Cardiovascular Systems Information Studies
Identifiers
urn:nbn:se:hb:diva-22598 (URN)10.21037/qims.2018.12.05 (DOI)000456878900013 ()30788253 (PubMedID)2-s2.0-85061211752 (Scopus ID)
Available from: 2020-01-20 Created: 2020-01-20 Last updated: 2020-01-22Bibliographically approved
Darányi, S., Wittek, P., Konstantinidis, K., Papadopoulos, S. & Kontopoulos, E. (2016). A Physical Metaphor to Study Semantic Drift. In: Proceedings of SuCCESS-16, 1st International Workshop on Semantic Change & Evolving Semantics: . Paper presented at 1st International Workshop on Semantic Change & Evolving Semantics, Leipzig, September 12, 2016. , 1695
Open this publication in new window or tab >>A Physical Metaphor to Study Semantic Drift
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2016 (English)In: Proceedings of SuCCESS-16, 1st International Workshop on Semantic Change & Evolving Semantics, 2016, Vol. 1695Conference paper, Published paper (Refereed)
Abstract [en]

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.

National Category
Other Computer and Information Science
Identifiers
urn:nbn:se:hb:diva-11648 (URN)978-1-4503-2138-9 (ISBN)
Conference
1st International Workshop on Semantic Change & Evolving Semantics, Leipzig, September 12, 2016
Available from: 2017-01-05 Created: 2017-01-05 Last updated: 2018-01-13Bibliographically approved
Kontopoulos, E., Darányi, S., Wittek, P., Konstantinidis, K., Riga, M., Mitzias, P., . . . Avgerinakis, K. (2016). Deliverable 4.5: Context-aware Content Interpretation. PERICLES project
Open this publication in new window or tab >>Deliverable 4.5: Context-aware Content Interpretation
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2016 (English)Report (Refereed)
Abstract [en]

The current deliverable summarises the work conducted within task T4.5 of WP4, presenting our proposed approaches for contextualised content interpretation, aimed at gaining insightful contextualised views on content semantics. This is achieved through the adoption of appropriate context-aware semantic models developed within the project, and via enriching the semantic descriptions with background knowledge, deriving thus higher level contextualised content interpretations that are closer to human perception and appraisal needs. More specifically, the main contributions of the deliverable are the following: A theoretical framework using physics as a metaphor to develop different models of evolving semantic content. A set of proof-of-concept models for semantic drifts due to field dynamics, introducing two methods to identify quantum-like (QL) patterns in evolving information searching behaviour, and a QL model akin to particle-wave duality for semantic content classification. Integration of two specific tools, Somoclu for drift detection and Ncpol2spda for entanglement detection. An “energetic” hypothesis accounting for contextualized evolving semantic structures over time. A proposed semantic interpretation framework, integrating (a) an ontological inference scheme based on Description Logics (DL), (b) a rule-based reasoning layer built on SPARQL Inference Notation (SPIN), (c) an uncertainty management framework based on non-monotonic logics. A novel scheme for contextualized reasoning on semantic drift, based on LRM dependencies and OWL’s punning mechanism. An implementation of SPIN rules for policy and ecosystem change management, with the adoption of LRM preconditions and impacts. Specific use case scenarios demonstrate the context under development and the efficiency of the approach. Respective open-source implementations and experimental results that validate all the above.All these contributions are tightly interlinked with the other PERICLES work packages: WP2 supplies the use cases and sample datasets for validating our proposed approaches, WP3 provides the models (LRM and Digital Ecosystem models) that form the basis for our semantic representations of content and context, WP5 provides the practical application of the technologies developed to preservation processes, while the tools and algorithms presented in this deliverable can be deployed in combination with test scenarios, which will be part of the WP6 test beds.

Place, publisher, year, edition, pages
PERICLES project, 2016. p. 101
Keywords
semantic drift, concept drift, contextualisation, ontologies, quantum-like systems
National Category
Communication Systems Computer Systems Interaction Technologies Other Engineering and Technologies not elsewhere specified Information Systems, Social aspects Media Studies
Research subject
Library and Information Science
Identifiers
urn:nbn:se:hb:diva-11753 (URN)
Projects
PERICLES
Funder
EU, FP7, Seventh Framework Programme, 601138
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2017-03-08Bibliographically approved
Waddington, S., Hedges, M., Riga, M., Mitzias, P., Kontopoulos, E., Kompatsiaris, I., . . . McNeill, J. (2016). PERICLES – Digital Preservation through Management of Change in Evolving Ecosystems.. In: Hamriouni, S. (Ed.), The Success of European Projects Using New Information and Communication Technologies: . Paper presented at European Project Space (EPS) event organized in Colmar, July 2015,associated with the set of conferences ICETE (12th International Joint Conference on e-Business and Telecommunications), ICSOFT (10th International Joint Conference on Software Technologies), SIMULTECH (5th International Conference on Simulation and Modeling Methodologies, Technologies and Applications) and DATA (4th International Conference on Data Management Technologies and Applications). (pp. 51-74). Setubal, Portugal
Open this publication in new window or tab >>PERICLES – Digital Preservation through Management of Change in Evolving Ecosystems.
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2016 (English)In: The Success of European Projects Using New Information and Communication Technologies / [ed] Hamriouni, S., Setubal, Portugal, 2016, p. 51-74Conference paper, Published paper (Refereed)
Abstract [en]

Management of change is essential to ensure the long-term reusabilityof digital assets. Change can be brought about in many ways, includingthrough technological, user community and policy factors. Motivated by casestudies in space science and time-based media, we consider the impact ofchange on complex digital objects comprising multiple interdependent entities,such as files, software and documentation. Our approach is based on modellingof digital ecosystems, in which abstract representations are used to assess risksto sustainability and support tasks such as appraisal. The paper is based onwork of the EU FP7 PERICLES project on digital preservation, and presentssome general concepts as well as a description of selected research areas underinvestigation by the project.

Place, publisher, year, edition, pages
Setubal, Portugal: , 2016
Keywords
digital preservation, digital ecosystems, PERICLES project
National Category
Communication Systems Computer Systems Interaction Technologies Information Systems Other Computer and Information Science Media Studies
Research subject
Library and Information Science
Identifiers
urn:nbn:se:hb:diva-11746 (URN)978-989-758-176-2 (ISBN)
Conference
European Project Space (EPS) event organized in Colmar, July 2015,associated with the set of conferences ICETE (12th International Joint Conference on e-Business and Telecommunications), ICSOFT (10th International Joint Conference on Software Technologies), SIMULTECH (5th International Conference on Simulation and Modeling Methodologies, Technologies and Applications) and DATA (4th International Conference on Data Management Technologies and Applications).
Funder
EU, FP7, Seventh Framework Programme, 601138
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2018-01-13Bibliographically approved
Maronidis, A., Chatzilari, E., Kontopoulos, E., Nikopoulos, S., Riga, M., Mitzias, P., . . . Sauter, C. (2016). PERICLES Deliverable 4.3: Content Semantics and Use Context Analysis Techniques. PERICLES project
Open this publication in new window or tab >>PERICLES Deliverable 4.3: Content Semantics and Use Context Analysis Techniques
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2016 (English)Report (Refereed)
Abstract [en]

The current deliverable summarises the work conducted within task T4.3 of WP4, focusing on the extraction and the subsequent analysis of semantic information from digital content, which is imperative for its preservability. More specifically, the deliverable defines content semantic information from a visual and textual perspective, explains how this information can be exploited in long-term digital preservation and proposes novel approaches for extracting this information in a scalable manner. Additionally, the deliverable discusses novel techniques for retrieving and analysing the context of use of digital objects. Although this topic has not been extensively studied by existing literature, we believe use context is vital in augmenting the semantic information and maintaining the usability and preservability of the digital objects, as well as their ability to be accurately interpreted as initially intended.

Place, publisher, year, edition, pages
PERICLES project, 2016. p. 120
Keywords
content, semantics, use context, content analysis, context analysis
National Category
Communication Systems Computer Systems Interaction Technologies Other Engineering and Technologies not elsewhere specified Information Systems, Social aspects Media Studies
Research subject
Library and Information Science
Identifiers
urn:nbn:se:hb:diva-11750 (URN)
Projects
PERICLES
Funder
EU, FP7, Seventh Framework Programme, 601138
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2017-03-08Bibliographically approved
Kontopoulos, E., Riga, M., Mitzias, P., Andreadis, S., Stavropoulos, T., Konstantinidis, K., . . . Corubolo, F. (2016). PERICLES Deliverable 4.4: Modelling Contextualised Semantics. PERICLES project
Open this publication in new window or tab >>PERICLES Deliverable 4.4: Modelling Contextualised Semantics
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2016 (English)Report (Refereed)
Abstract [en]

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.

Place, publisher, year, edition, pages
PERICLES project, 2016. p. 102
Keywords
modelling, context, semantics
National Category
Communication Systems Computer Systems Interaction Technologies Information Systems, Social aspects Media Studies
Research subject
Library and Information Science
Identifiers
urn:nbn:se:hb:diva-11749 (URN)
Projects
PERICLES
Funder
EU, FP7, Seventh Framework Programme, 601138
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2017-03-08Bibliographically approved
Wittek, P., Liu, Y.-H., Darányi, S., Gedeon, T. & Lim, I. S. (2016). Risk and Ambiguity in Information Seeking: Eye Gaze Patterns Reveal Contextual Behaviour in Dealing with Uncertainty. Frontiers in Psychology, 7
Open this publication in new window or tab >>Risk and Ambiguity in Information Seeking: Eye Gaze Patterns Reveal Contextual Behaviour in Dealing with Uncertainty
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2016 (English)In: Frontiers in Psychology, ISSN 1664-1078, E-ISSN 1664-1078, Vol. 7Article in journal (Refereed) Published
Abstract [en]

Information foraging connects optimal foraging theory in ecology with how humans search for information. The theory suggests that, following an information scent, the information seeker must optimize the tradeoff between exploration by repeated steps in the search space vs. exploitation, using the resources encountered. We conjecture that this tradeoff characterizes how a user deals with uncertainty and its two aspects, risk and ambiguity in economic theory. Risk is related to the perceived quality of the actually visited patch of information, and can be reduced by exploiting and understanding the patch to a better extent. Ambiguity, on the other hand, is the opportunity cost of having higher quality patches elsewhere in the search space. The aforementioned tradeoff depends on many attributes, including traits of the user: at the two extreme ends of the spectrum, analytic and wholistic searchers employ entirely different strategies. The former type focuses on exploitation first, interspersed with bouts of exploration, whereas the latter type prefers to explore the search space first and consume later. Based on an eye-tracking study of experts’ interactions with novel search interfaces in the biomedical domain, we demonstrate that perceived risk shifts the balance between exploration and exploitation in either type of users, tilting it against vs. in favour of ambiguity minimization. Since the pattern of behaviour in information foraging is quintessentially sequential, risk and ambiguity minimization cannot happen simultaneously, leading to a fundamental limit on how good such a tradeoff can be. This in turn connects information seeking with the emergent field of quantum decision theory.

Keywords
information foraging, quantum decision theory, risk and ambiguity minimizationl, eye gaze, information seeking, cognitive style
National Category
Other Computer and Information Science
Identifiers
urn:nbn:se:hb:diva-11643 (URN)10.3389/fpsyg.2016.01790 (DOI)000387917200001 ()27909418 (PubMedID)2-s2.0-85006337226 (Scopus ID)
Available from: 2017-01-05 Created: 2017-01-05 Last updated: 2018-01-13Bibliographically approved
Wittek, P., Darányi, S. & Nelhans, G. (2016). Ruling out static latent homophily in citation networks. Scientometrics, 110(2), 765-777
Open this publication in new window or tab >>Ruling out static latent homophily in citation networks
2016 (English)In: Scientometrics, ISSN 0138-9130, E-ISSN 1588-2861, Vol. 110, no 2, p. 765-777Article in journal (Refereed) Published
Abstract [en]

Citation and coauthor networks offer an insight into the dynamics of scientific progress. We can also view them as representations of a causal structure, a logical process captured in a graph. From a causal perspective, we can ask questions such as whether authors form groups primarily due to their prior shared interest, or if their favourite topics are ‘contagious’ and spread through co-authorship. Such networks have been widely studied by the artificial intelligence community, and recently a connection has been made to nonlocal correlations produced by entangled particles in quantum physics—the impact of latent hidden variables can be analyzed by the same algebraic geometric methodology that relies on a sequence of semidefinite programming (SDP) relaxations. Following this trail, we treat our sample coauthor network as a causal graph and, using SDP relaxations, rule out latent homophily as a manifestation of prior shared interest only, leading to the observed patternedness. By introducing algebraic geometry to citation studies, we add a new tool to existing methods for the analysis of content-related social influences.

Keywords
Causal network, Citation network, Hidden variables, Semidefinite programming, Sum-of-squares decomposition
National Category
Other Computer and Information Science
Identifiers
urn:nbn:se:hb:diva-11645 (URN)10.1007/s11192-016-2194-9 (DOI)2-s2.0-85001053538 (Scopus ID)
Available from: 2017-01-05 Created: 2017-01-05 Last updated: 2018-01-13Bibliographically approved
Kontopoulos, E., Moysiadis, T., Tsagiopoulou, M., Darányi, S., Wittek, P., Papakonstantinou, N., . . . Kompatsiaris, I. (2016). Studying the Cohesion Evolution of Genes Related to Chronic Lymphocytic Leukemia Using Semantic Similarity in Gene Ontology and Self-Organizing Maps. In: Proceedings of SWAT4LS-16, 9th International Conference on Semantic Web Applications and Tools for Life Sciences: . Paper presented at 9th International Conference on Semantic Web Applications and Tools for Life Sciences, Amsterdam, December 5-8, 2016.
Open this publication in new window or tab >>Studying the Cohesion Evolution of Genes Related to Chronic Lymphocytic Leukemia Using Semantic Similarity in Gene Ontology and Self-Organizing Maps
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2016 (English)In: Proceedings of SWAT4LS-16, 9th International Conference on Semantic Web Applications and Tools for Life Sciences, 2016Conference paper, Published paper (Refereed)
Abstract [en]

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.

Keywords
Chronic Lymphocytic Leukemia, Gene Ontology, Semantic Similarity, Semantic Drift, Self-Organizing Maps
National Category
Other Computer and Information Science
Identifiers
urn:nbn:se:hb:diva-11650 (URN)
Conference
9th International Conference on Semantic Web Applications and Tools for Life Sciences, Amsterdam, December 5-8, 2016
Available from: 2017-01-05 Created: 2017-01-05 Last updated: 2018-01-13Bibliographically approved
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