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Sofia University "St. Kliment Ohridski"

Browsing by Author "Koychev, Ivan"

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Browsing by Author "Koychev, Ivan"

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  • Adaptation to Drifting User's Interests 
    Schwab, Ingo; Koychev, Ivan (In proc. of ECML2000 Workshop: Machine Learning in New Information Age, 2000)
    In recent years, many systems have been developed which aim at helping users to find pieces of information or other objects that are in accordance with their personal interests. In these systems, machine learning methods ...
  • A Just-In-Time Information Retrieval Agent that Provides Context Aware Support of Text Creation 
    Chenkova, Chenkova; Koychev, Ivan (Demetra EOOD, 2009-10-29)
    Finding relevant resources and supplemental information that support the process of text creation is time consuming and often distracting for the author. With the increase of digitally stored information, accessing diverse ...
  • Changing User Interests through Prior-Learning of Context 
    Koychev, Ivan (In: de Bra, P., Brusilovsky, P., Conejo, R. (eds.): Adaptive Hypermedia and Adaptive Web Based Systems. Lecture Notes in Computer Science, 2002)
    The paper presents an algorithm for learning drifting and recurring user interests. The algorithm uses a prior-learning level to find out the current context. After that, searches into past observations for episodes that ...
  • Classification of Online Reviews by Computational Semantic Lexicons 
    Kraychev, Boris; Koychev, Ivan (Springer-Verlag Berlin Heidelberg 2011, 2011)
    We present a method for automatic generation of sentiment aware lexicon based on 500’000 recent online user reviews about restaurants and hotels. The experiments include an implementation of a web crawler, part of speech ...
  • DESIGNING A TOOLSET FOR THE PRIME VIRTUAL BUSINESS ENVIRONMENT 
    Boytchev, Pavel; Bontchev, Boyan; Nikolov, Roumen; Olivera, Manuel; Koychev, Ivan (10th International Workshop of the IFIP WG 5.7 Special Interest Group on Experimental Interactive Learning in Industrial Management: Multidisciplinary Research on Simulation Methods and Educational Games in Industrial Management, 2006)
    The PRIME (Providing Real Integration in Multi-disciplinary Environments) project1 aims in modeling, creating and evaluation of a Virtual Business Environment (VBE) for learning the entire life cycle of products and ...
  • Experiments with Two Approaches for Tracking Drifting Concepts 
    Koychev, Ivan (“Serdica Journal of Computing” 1, Institute of Mathematics and Informatics - BAS, 2006)
    . This paper addresses the task of learning classifier from stream of labelled data. In this case we can face problem that the underling concepts can changes over time. The paper studies two mechanisms developed for dealing ...
  • Feature Selection and Generalisation for Retrieval of Textual Cases 
    Wiratung, Nirmalie; Koychev, Ivan; Massie, Stewart (Proceeding of the 7-th European Conference on Case-Based Reasoning. Lecture Notes in Artificial Intelligence, 2004)
    Textual CBR systems solve problems by reusing experiences that are in textual form. Knowledge-rich comparison of textual cases remains an important challenge for these systems. However mapping text data into a structured ...
  • Gradual Forgetting for Adaptation to Concept Drift 
    Koychev, Ivan (Proceedings of ECAI 2000 Workshop on Current Issues in Spatio-Temporal Reasoning,, 2000)
    The paper presents a method for gradual forgetting, which is applied for learning drifting concepts. The approach suggests the introduction of a time-based forgetting function, which makes the last observations more ...
  • Intelligent Search in eBook Repository 
    Ali, Waris; Koychev, Ivan (Sofia University, 2010-09-11)
    Nowadays a lot of systems are available for searching e-books, but the ways to retrieve relevant and meaningful information are difficult. To cope with this problem of retrieving relevant information efficiently we ...
  • Intelligent Search in eBook Repository 
    Ali, Waris; Koychev, Ivan (Demetra EOOD, 2010)
    Nowadays a lot of systems are available for searching e-books, but the ways to retrieve relevant and meaningful information are difficult. To cope with this problem of retrieving relevant information efficiently we proposed ...
  • A Just-In-Time Information Retrieval Agent that Provides Context Aware Support of Text Creation 
    Chenkova, Elitza; Koychev, Ivan (Demetra EOOD, 2009)
    Finding relevant resources and supplemental information that support the process of text creation is time consuming and often distracting for the author. With the increase of digitally stored information, accessing diverse ...
  • Learning about the User: A General Approach and Its Application 
    Pohl, Wolfgang; Schwab, Ingo; Koychev, Ivan (Proceeding of IJCAI'99 Workshop: Learning About Users, 1999)
  • Learning about Users from Observation 
    Schwab, Ingo; Kobsa, Alfred; Koychev, Ivan (In proc. of the AAAI Spring Symposium: Adaptive User Interfaces, Menlo Park CA: AAAI Press., 2000)
    Many approaches and systems for recommending information, goods, or other kinds of objects have been developed in recent years. In these systems, machine learning methods are often used that need training input to acquire ...
  • Learning to Recommend from Positive Evidence 
    Schwab, Ingo; Pohl, Wolfgang; Koychev, Ivan (Proceedings of the International Conference on Intelligent User Interfaces IUI2000, 2000)
    In recent years, many systems and approaches for recommending information, goods, or other kinds of objects have been developed. In these systems, often machine learning methods are used that need training input to acquire ...
  • Online Authoring System with Semi-automatic Annotation and Visual Knowledge Representation 
    Kiprov, Yasen; Koychev, Ivan (Sofia University, 2010-09-11)
    With the recent development of technology e-books are becoming more and more popular. Some of them already incorporate rich multimedia and hyperlinks, adding references to different resources. On the other hand, the ...
  • Query-Based Document Skimming: A User-Centred Evaluation of Relevance Profiling 
    Harper, David; Koychev, Ivan; Sun, Yixing (Proceedings of 25-th European Conference on Information Retrieval. Lecture Notes in Computer Science, 2003)
    We present a user-centred, task-oriented, comparative evaluation of two query-based document skimming tools. ProfileSkim bases within-document retrieval on computing a relevance profile for a document and query; FindSkim ...
  • Query-Based Summarization: A survey 
    Damova, Mariana; Koychev, Ivan (Sofia University, 2010-09-11)
    This paper presents a survey of recent extractive query-based summarization techniques. We explore approaches for single document and multi-document summarization. Knowledge-based and machine learning methods for choosing ...
  • Query-Based Summarization: A survey 
    Damova, Mariana; Koychev, Ivan (Demetra EOOD, 2010)
    This paper presents a survey of recent extractive query-based summarization techniques. We explore approaches for single document and multi-document summarization. Knowledge-based and machine learning methods for choosing ...
  • SmartBook: The New Generation e-Book Meets University 2.0 
    Koychev, Ivan; Nikolov, Roumen; Dicheva, Darina (Demetra EOOD, 2009-10-29)
    This paper presents a vision for the future of the e-books as part of the growing collective intelligence. The vision entails further development of technologies that will facilitate the creation and use of a new generation ...
  • SmartBook: The New Generation e-Book Meets University 2.0 
    Koychev, Ivan; Nikolov, Roumen; Dicheva, Darina (Demetra EOOD, 2009)
    This paper presents a vision for the future of the e-books as part of the growing collective intelligence. The vision entails further development of technologies that will facilitate the creation and use of a new generation ...