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Elias Iosif

PostDoctoral researcher

Elias (Ilias) Iosif received his PhD degree from the School of ECE, Technical University of Crete, Greece in Oct. 2013. He holds a 5-year Diploma (2005) and a MS degree (2007) from the same department. From 2007 to Sep. 2013 he was a research assistant at the School of ECE, Technical University of Crete, Greece. Beginning Jan. 2014, he is a post-doctoral researcher affiliated with the School of ECE, National Technical University of Athens, Greece and the "Athena" Research and Innovation Center in Information, Athens, Greece. The core of his research is in the area of lexical semantics focus on Distributional Semantic Models (DSMs). As part of his PhD research he proposed a network-based DSM approach for the computation of semantic similarity between words. His recent interests include the extension of this network approach towards the development of multimodal/multilingual semantic networks, and the creation of a compositional framework for computing the similarity between larger textual fragments, e.g., phrases and sentences. Parts of his work have been applied to various tasks including the affective analysis of text and creation of social networks from web-harvested data. Also, he applied DSMs and affective text analysis to spoken dialogue systems in the framework of two recent EC-founded projects: PortDial (www.portdial.eu) and SpeDial (www.spedial.eu).

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Education & Publications

Education

  • Doctor of Philosophy, 2013

    Technical University of Crete

    School of Electronic & Computer Engineering

    Thesis: "Network-Based Distributional Semantic Models"
    Advisor: Prof. Alexandros Potamianos

  • Master of Science, 2007

    Technical University of Crete

    Dept. of Electronic & Computer Engineering

    Thesis: "Unsupervised Induction of Semantic Classes Using Semantic Similarity Metrics"
    Advisor: Prof. Alexandros Potamianos

  • Five-year Diploma, 2005

    Technical University of Crete

    Dept. of Electronic & Computer Engineering

    Thesis: "Automatic Derivation of Ontologies from Text"
    Advisor: Prof. Alexandros Potamianos

Publications

JOURNAL PAPERS

  1. Elias Iosif, Ioannis Klasinas, Georgia Athanasopoulou, Elisavet Palogiannidi, Spiros Georgiladakis, Katerina Louka, Alexandros Potamianos. ``Speech Understanding for Spoken Dialogue Systems: From Corpus Harvesting to Grammar Rule Induction'', Computer Speech and Language, 2017. (under review)
  2. Elias Iosif, Alexandros Potamianos. ``Similarity Computation Using Semantic Networks Created From Web-Harvested Data'', Natural Language Engineering, vol. 21, issue 01, pp. 49-79, Jan 2015.
  3. Nikos Malandrakis, Alexandros Potamianos, Elias Iosif, Shrikanth~Narayanan ``Distributional Semantic Models for Affective Text Analysis''. IEEE Transactions on Audio, Speech and Language Processing, vol. 21, issue 11, pp. 2379-2392, 2013.
  4. Theodosis Moschopoulos, Elias Iosif, Leeda Demetropoulou, Alexandros Potamianos, Shrikanth Narayanan. ``Towards the Automatic Extraction of Policy Networks using Web Links and Documents''. IEEE Transactions on Knowledge and Data Engineering, vol. 25, issue 10, pp. 2404-2417, 2012.
  5. Elias Iosif, Alexandros Potamianos. ``Unsupervised Semantic Similarity Computation Between Terms Using Web Documents''. IEEE Transactions on Knowledge and Data Engineering, vol. 22, no. 11, pp. 1637-1647, 2010.

BOOK CHAPTERS

  1. Elias Iosif, Georgios Petasis and Vangelis Karkaletsis, ``Ontology Based Information Extraction Under a Bootstrapping Approach''. In ``Semi-Automatic Ontology Development: Processes and Resources'', Maria Teresa Pazienza and Armando Stellato (Eds), IGI Global Inc., ISBN 9781466601888, 2012.
  2. Vangelis Karkaletsis, Pavlina Fragkou, Georgios Petasis, Elias Iosif. ``Ontology Based Information Extraction from Text''. In ``Knowledge-Driven Multimedia Information Extraction and Ontology Evolution'', George Paliouras, Constantine Spyropoulos and George Tsatsaronis (Eds), Springer Verlag, vol. 6050, ISBN 978-3-642-20794-5, 2011.

CONFERENCE PAPERS

  1. Spiros Georgiladakis, Georgia Athanasopoulou, Raveesh Meena, Jose Lopes, Arodami Chorianopoulou, Elisavet Palogiannidi, Elias Iosif, Gabriel Skantze, Alexandros Potamianos. ``Root Cause Analysis of Miscommunication Hotspots in Spoken Dialogue Systems''. Interspeech, 8-12 September 2016, San Francisco, California, USA.
  2. Giannis Karamanolakis, Elias Iosif, Athanasia Zlatintsi, Aggelos Pikrakis, Alexandros Potamianos. ``Audio-based Distributional Representations of Meaning Using a Fusion of Feature Encodings''. Interspeech, 8-12 September 2016, San Francisco, California, USA.
  3. Elisavet Palogiannidi, Athanasia Kolovou, Fenia Christopoulou, Filippos Kokkinos, Elias Iosif, Nikolaos Malandrakis, Harris Papageorgiou, ShrikanthNarayanan, Alexandros Potamianos. ``Tweester: Sentiment Analysis in Twitter using Semantic-Affective Model Adaptation''. International Workshop on Semantic Evaluation (SemEval'16), 16-17 June 2016, San Diego, California, USA. [Best system for shared evaluation task 4B]
  4. Elisavet Palogiannidi, Elias Iosif, Polychronis Koutsakis, Alexandros Potamianos. ``A Semantic-Affective Compositional Approach for the Affective Labelling of Adjective-Noun and Noun-Noun Pairs''. 7th Workshop on Computational Approaches to Subjectivity, Sentiment and Social Media Analysis (WASSA), 16 June 2016, San Diego, California, USA.
  5. Elias Iosif, Alexandros Potamianos. ``Crossmodal Network-Based Distributional Semantic Models''. In: 10th International Conference on Language Resources and Evaluation (LREC), Portoroz, Slovenia, May 2016.
  6. Elias Iosif, Spiros Georgiladakis, Alexandros Potamianos. ``Cognitively Motivated Distributional Representations of Meaning''. In: 10th International Conference on Language Resources and Evaluation (LREC), Portoroz, Slovenia, May 2016.
  7. Elisavet Palogiannidi, Elias Iosif, Polychronis Koutsakis, Alexandros Potamianos. ``Affective Lexicon Creation for the Greek Language''. In: 10th International Conference on Language Resources and Evaluation (LREC), Portoroz, Slovenia, May 2016.
  8. Jose Lopes, Arodami Chorianopoulou, Elisavet Palogiannidi, Helena Moniz, Alberto Abad, Katerina Louka, Elias Iosif and Alexandros Potamianos. The SpeDial datasets: datasets for Spoken Dialogue Systems analytics''. In: 10th International Conference on Language Resources and Evaluation (LREC), Portoroz, Slovenia, May 2016.
  9. Alexandros Potamianos, Costas Tzafestas, Elias Iosif, Franziska Kirstein, Petros Maragos, Kerstin Dauthenhahn, Joakim Gustafson, John Erland Ostergaard, Stefan Kopp, Preben Wik, Oliver Pietquin, Samer Al Moubayed. ``BabyRobot - Next Generation Social Robots: Enhancing Communication and Collaboration Development of TD and ASD Children by Developing and Commercially Exploiting the Next Generation of Human-Robot Interaction Technologies''. 2nd Workshop on Evaluating Child-Robot Interaction (CRI) at Human-Robot Interaction (HRI'16), Christchurch, New Zealand, March 2016.
  10. Athanasia Zlatintsi, Elias Iosif, Petros Maragos, Alexandros Potamianos. ``Audio Salient Event Detection and Summarization Using Audio and Text Modalities''. In: European Signal Processing Conference (EUSIPCO), Nice, France, Sept 2015.
  11. Petros Koutras, Athanasia Zlatintsi, Elias Iosif, Athanasios Katsamanis, Petros Maragos, Alexandros Potamianos. ``Predicting Audio-Visual Salient Events Based on Visual, Audio and Text Modalities for Movie Summarization''. In: IEEE International Conference on Image Processing (ICIP), Qu\'{e}bec City, Canada, Sept 2015.
  12. Elisavet Palogiannidi, Elias Iosif, Polychronis Koutsakis, Alexandros Potamianos. ``Valence, Arousal and Dominance Estimation for English, German, Greek, Portuguese and Spanish Lexica using Semantic Models''. In: Interspeech, Dresden, Germany, Sept 2015.
  13. Spiros Georgiladakis, Elias Iosif, Alexandros Potamianos. ``Fusion of Compositional Network-based and Lexical Function Distributional Semantic Models''. In: Proc. Cognitive Modeling and Computational Linguistics (CMCL) Workshop, Conference of the North American Chapter of the Association for Computational Linguistics -- Human Language Technologies (NAACL--HLT), Denver, Colorado, USA, June 2015.
  14. Elias Iosif and Alexandros Potamianos. ``Feeling is Understanding: From Affective to Semantic Spaces''. In: Proc. 11th International Conference for Computational Semantics (IWCS), London, UK, Apr 2015.
  15. Georgia Athanasopoulou, Ioannis Klasinas, Spiros Georgiladakis, Elias Iosif, Alexandros Potamianos. ``Using Lexical, Syntactic and Semantic Features for Non-Terminal Grammar Rule Induction in Spoken Dialogue Systems''. In: Proc. IEEE International Workshop on Spoken Language Technology (SLT), South Lake Tahoe, USA, Dec 2014.
  16. Manolis Tsangaris, Vassiliki Kouloumenta , Katerina Louka, Spyros Georgiladakis, Manolis Perakakis, Georgia Athanasopoulou, Ioannis Klasinas, Elias Iosif, Alexandros Potamianos. ``The PortDial/SpeDial Grammar Induction Platform for Spoken Dialogue Systems ''. In: Proc. IEEE International Workshop on Spoken Language Technology (SLT), South Lake Tahoe, USA, Dec 2014.
  17. Spiros Georgiladakis, Christina Unger, Elias Iosif, Sebastian Walter, Philipp Cimiano, Euripides Petrakis, Alexandros Potamianos. ``Fusion of Knowledge-Based and Data-Driven Approaches to Grammar Induction''. In: Proc. Interspeech, Singapore, Sep 2014.
  18. Ioannis Klasinas, Elias Iosif, Katerina Louka, Alexandros Potamianos. ``SemEval-2014 Task 2: Grammar Induction for Spoken Dialogue Systems''. In: Proc. 8th International Workshop on Semantic Evaluation (SemEval), Dublin, Ireland, Aug 2014.
  19. Arodami Chorianopoulou, Georgia Athanasopoulou, Elias Iosif, Ioannis Klasinas, Alexandros Potamianos. ``tucSage: Grammar Rule Induction for Spoken Dialogue Systems via Probabilistic Candidate Selection''. In: Proc. 8th International Workshop on Semantic Evaluation (SemEval), Dublin, Ireland, Aug 2014.
  20. Georgia Athanasopoulou, Elias Iosif, Alexandros Potamianos. ``Low-Dimensional Manifold Distributional Semantic Models''. In: Proc. 25th International Conference on Computational Linguistics (COLING), Dublin, Ireland, Aug 2014.
  21. Kalliopi Zervanou, Elias Iosif, Alexandros Potamianos. ``Word Semantic Similarity for Morphologically Rich Languages''. In: Proc. 9th International Conference on Language Resources and Evaluation (LREC), Reykjavik, Iceland, May 2014.
  22. Elisavet Palogiannidi, Ioannis Klasinas, Alexandros Potamianos, Elias Iosif. ``Spoken Dialogue Grammar Induction from Crowdsourced Data''. In: Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Florence, Italy, May 2014.
  23. Elias Iosif and Taniya Mishra. ``From Speaker Identification to Affective Analysis: A Multi-Step System for Analyzing Children Stories''. In: Proc. Third Workshop on Computational Linguistics for Literature (co-located with EACL'14), Gothenburg, Sweden, April 2014.
  24. Ioannis Klasinas, Alexandros Potamianos, Elias Iosif, Spiros Georgiladakis, Gianluca Mameli. ``Web Data Harvesting for Speech Understanding Grammar Induction''. In: Proc. Interspeech, August 2013.
  25. Nikos Malandrakis, Elias Iosif, Vassiliki Prokopi, Alexandros Potamianos, Shrikanth Narayanan. ``Deep Purple: Lexical, String and Affective Feature Fusion for Sentence-Level Semantic Similarity Estimation''. In: Proc. *SEM, 2013.
  26. Elias Iosif, Alexandros Potamianos, Maria Giannoudaki, Kalliopi Zervanou. ``Semantic Similarity Computation for Abstract and Concrete Nouns Using Network-Based Distributional Semantic Models''. In: Proc. 10th International Conference for Computational Semantics (IWCS), Potsdam, Germany, 2013.
  27. Nikos Malandrakis, Elias Iosif, Alexandros Potamianos. ``DeepPurple: Estimating Sentence Semantic Similarity using N-gram Regression Models and Web Snippets''. In: Proc. First Joint Conference on Lexical and Computational Semantics (*SEM), Montreal, Canada, 2012.
  28. Elias Iosif, Alexandros Potamianos. ``SemSim: Resources for Normalized Semantic Similarity Computation Using Lexical Networks''. In: Proc. 8th International Conference on Language Resources and Evaluation (LREC), Istanbul, Turkey, 2012.
  29. Elias Iosif, Maria Giannoudaki, Eric Fosler-Lussier, Alexandros Potamianos. ``Associative and Semantic Features Extracted From Web-Harvested Corpora''. In: Proc. 8th International Conference on Language Resources and Evaluation (LREC), Istanbul, Turkey, 2012.
  30. Nikos Malandrakis, Alexandros Potamianos, Elias Iosif and Shrikanth Narayanan. ``EmotiWord: Affective Lexicon Creation with Application to Interaction and Multimedia Data". In: Proc. MUSCLE International Workshop on Computational Intelligence for Multimedia Understanding , Pisa, Italy, 2011.
  31. Nikos Malandrakis, Alexandros Potamianos, Elias Iosif, Shrikanth Narayanan. ``Kernel Models for Affective Lexicon Creation''. In Proc. of Interspeech, Florence, Italy, 2011.
  32. Elias Iosif. ``Unsupervised Web Name Disambiguation Using Semantic Similarity and Single-Pass Clustering''. In: Proc. 6th Hellenic Conference on Artificial Intelligence (SETN), Athens, Greece, 2010.
  33. Elias Iosif, Alexandros Potamianos. ``Unsupervised Semantic Similarity Computation Using Web Search Engines''. In: Proc. IEEE/WIC/ACM International Conference on Web Intelligence (WI), Silicon Valley, USA, 2007.
  34. Elias Iosif, Alexandros Potamianos. ``A Soft-Clustering Algorithm for Automatic Induction of Semantic Classes''. In: Proc. Interspeech, Antwerp, Belgium, 2007.
  35. Elias Iosif, Athanasios Tegos, Apostolos Pangos, Eric Fosler-Lussier, Alexandros Potamianos. ``Unsupervised Combination of Metrics for Semantic Class Induction''. In: Proc. IEEE/ACL International Workshop on Spoken Language Technology (SLT), Aruba, 2006.
  36. Apostolos Pangos, Elias Iosif, Alexandros Potamianos, Eric Fosler-Lussier. ``Combining Statistical Similarity Metrics for Automatic Induction of Semantic Classes''. In: Proc. IEEE International Workshop on Automatic Speech Recognition and Understanding (ASRU), San Juan, Puerto Rico, 2005.

News & Highlights

Proud to be member of the Tweester team that won the 1st place (among 19 groups) in the Twiter sentiment analysis task SemEval 2016 competition. Also, you may read a related article published in the local press (in Greek). March 2016

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