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400 results on '"Vasilecas, Olegas"'

1. Outlier Analysis for Telecom Fraud Detection

Author

Chadyšas, Viktoras, Bugajev, Andrej, Kriauzienė, Rima, Vasilecas, Olegas, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Ivanovic, Mirjana, editor, Kirikova, Marite, editor, and Niedrite, Laila, editor

Published
2022
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2. General Context-Aware Data Matching and Merging Framework

Author

Žitnik, Slavko, Šubelj, Lovro, Lavbič, Dejan, Vasilecas, Olegas, and Bajec, Marko

Subjects
Computer Science - Information Retrieval, Computer Science - Databases
Abstract

Due to numerous public information sources and services, many methods to combine heterogeneous data were proposed recently. However, general end-to-end solutions are still rare, especially systems taking into account different context dimensions. Therefore, the techniques often prove insufficient or are limited to a certain domain. In this paper we briefly review and rigorously evaluate a general framework for data matching and merging. The framework employs collective entity resolution and redundancy elimination using three dimensions of context types. In order to achieve domain independent results, data is enriched with semantics and trust. However, the main contribution of the paper is evaluation on five public domain-incompatible datasets. Furthermore, we introduce additional attribute, relationship, semantic and trust metrics, which allow complete framework management. Besides overall results improvement within the framework, metrics could be of independent interest., Comment: 29 pages, 12 figures, 2 tables

Published
2018

3. Ontology-based multi-agent system to support business users and management

Author

Lavbič, Dejan, Vasilecas, Olegas, and Rupnik, Rok

Subjects
Computer Science - Multiagent Systems, Computer Science - Computers and Society
Abstract

For some decision processes a significant added value is achieved when enterprises' internal Data Warehouse (DW) can be integrated and combined with external data gained from web sites of competitors and other relevant Web sources. In this paper we discuss the agent-based integration approach using ontologies (DSS-MAS). In this approach data from internal DW and external sources are scanned by coordinated group of agents, while semantically integrated and relevant data is reported to business users according to business rules. After data from internal DW, Web sources and business rules are acquired, agents using these data and rules can infer new knowledge and therefore facilitate decision making process. Knowledge represented in enterprises' ontologies is acquired from business users without extensive technical knowledge using user friendly user interface based on constraints and predefined templates. The approach presented in the paper was verified using the case study from the domain of mobile communications with the emphasis on supply and demand of mobile phones., Comment: 17 pages, 6 figures

Published
2018
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4. Rule- and context-based dynamic business process modelling and simulation

Author

Vasilecas, Olegas, Kalibatiene, Diana, and Lavbič, Dejan

Subjects
Computer Science - Software Engineering
Abstract

The traditional approach used to implement a business process (BP) in today's information systems (IS) no longer covers the actual needs of the dynamically changing business. Therefore, a necessity for a new approach of dynamic business process (DBP) modelling and simulation has arisen. To date, existing approaches to DBP modelling and simulation have been incomplete, i.e. they lack theory or a case study or both. Furthermore, there is no commonly accepted definition of BDP. Current BP modelling tools are suitable almost solely for the modelling and simulation of a static BP that strictly prescribes which activities, and in which sequence, to execute. Usually, a DBP is not defined strictly at the beginning of its execution, and it changes under new conditions at runtime. In our paper, we propose six requirements of DBP and an approach for rule- and context-based DBP modelling and simulation. The approach is based on changing BP rules, BP actions and their sequences at process instance runtime, according to the new business system context. Based on the proposed approach, a reference architecture and prototype of a DBP simulation tool were developed. Modelling and simulation were carried out using this prototype, and the case study shows correspondence to the needs of dynamically changing business, as well as possibilities for modelling and simulating DBP., Comment: 22 pages, 4 figures, 3 tables

Published
2018
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5. Application of Interactive Classification System in University Study Course Comparison

Author

Birzniece, Ilze, Rudzajs, Peteris, Kalibatiene, Diana, Vasilecas, Olegas, and Rencis, Edgars

Abstract

The growing amount of information in the world has increased the need for computerized classification of different objects. This situation is present in higher education as well where the possibility of effortless detection of similarity between different study courses would give the opportunity to organize student exchange programmes effectively and facilitate curriculum management and development. This area which currently relies on manual time-consuming expert activities could benefit from application of smartly adapted machine learning technologies. Data in this problem domain is complex leading to inability for automatic classification approaches to always reach the desired result in terms of classification accuracy. Therefore, our approach suggests an automated/semi-automated classification solution, which incorporates both machine learning facilities and interactive involvement of a domain expert for improving classification results. The system's prototype has been implemented and experiments are carried out. This interactive classification system allows to classify educational data, which often comes in unstructured or semi-structured, incomplete and/or insufficient form, thus reducing the number of misclassified instances significantly in comparison with the automatic machine learning approach. [A bibliography is included.]

Published
2015

7. Shared Resource Model for Allocating Resources to Activities in BP Simulation

Author

Vasilecas, Olegas, Normantas, Kestutis, Rusinaite, Toma, Savickas, Titas, Vysockis, Tadas, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Kotenko, Igor, Series editor, Liu, Ting, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Dregvaite, Giedre, editor, and Damasevicius, Robertas, editor

Published
2016
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8. Dynamic Business Process Simulation - A Rule- and Context- Based Approach

Author

Kalibatiene, Diana, Vasilecas, Olegas, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Kotenko, Igor, Series editor, Liu, Ting, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Dregvaite, Giedre, editor, and Damasevicius, Robertas, editor

Published
2016
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9. Improving Business Processes in HIS by Adding Dynamicity

Author

Kalibatiene, Diana, Trinkunas, Justas, Rusinaite, Toma, Vasilecas, Olegas, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Kotenko, Igor, Series editor, Liu, Ting, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Dregvaite, Giedre, editor, and Damasevicius, Robertas, editor

Published
2016
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12. Directed Acyclic Graph Extraction from Event Logs

Author

Vasilecas, Olegas, Savickas, Titas, Lebedys, Evaldas, Junqueira Barbosa, Simone Diniz, Series editor, Chen, Phoebe, Series editor, Cuzzocrea, Alfredo, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Kotenko, Igor, Series editor, Sivalingam, Krishna M., Series editor, Ślęzak, Dominik, Series editor, Washio, Takashi, Series editor, Yang, Xiaokang, Series editor, Dregvaite, Giedre, editor, and Damasevicius, Robertas, editor

Published
2014
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17. Survey on Ontology Languages

Author

Kalibatiene, Diana, Vasilecas, Olegas, van der Aalst, Wil, Series editor, Mylopoulos, John, Series editor, Rosemann, Michael, Series editor, Shaw, Michael J., Series editor, Szyperski, Clemens, Series editor, Grabis, Janis, editor, and Kirikova, Marite, editor

Published
2011
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20. Business Rule Model Integration into the Model of Transformation Driven Software Development

Author

Vasilecas, Olegas, Smaizys, Aidas, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Grundspenkis, Janis, editor, Kirikova, Marite, editor, Manolopoulos, Yannis, editor, and Novickis, Leonids, editor

Published
2010
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24. Natural Language Based Heavy Personal Assistant Architecture for Information Retrieval and Presentation

Author

Laukaitis, Algirdas, Vasilecas, Olegas, Gediminas, Vilnius, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Smith, Michael J., editor, and Salvendy, Gavriel, editor

Published
2007
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25. Integrating All Stages of Information Systems Development by Means of Natural Language Processing

Author

Laukaitis, Algirdas, Vasilecas, Olegas, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Rangan, C. Pandu, editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Sawyer, Pete, editor, Paech, Barbara, editor, and Heymans, Patrick, editor

Published
2007
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26. Tool-Supported Method for the Extraction of OCL from ORM Models

Author

Sosunovas, Sergejus, Vasilecas, Olegas, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Rangan, C. Pandu, editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, and Abramowicz, Witold, editor

Published
2007
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27. Asymmetric Hybrid Machine Translation for Languages with Scarce Resources

Author

Laukaitis, Algirdas, Vasilecas, Olegas, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Rangan, C. Pandu, Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, and Gelbukh, Alexander, editor

Published
2007
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30. Business Rules in Clinical Trials

Author

Vasilecas, Olegas, Lebedys, Evaldas, Magyar, Gabor, editor, Knapp, Gabor, editor, Wojtkowski, Wita, editor, Wojtkowski, W. Gregory, editor, and Zupančič, Jože, editor

Published
2007
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31. Ontology-Based Information Systems Development: The Problem of Automation of Information Processing Rules

Author

Vasilecas, Olegas, Bugaite, Diana, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Yakhno, Tatyana, editor, and Neuhold, Erich J., editor

Published
2006
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33. Ontology-Based Elicitation of Business Rules

Author

Vasilecas, Olegas, Bugaite, Diana, Nilsson, Anders G., editor, Gustas, Remigijus, editor, Wojtkowski, Wita, editor, Wojtkowski, W. Gregory, editor, Wrycza, Stanisław, editor, and Zupančič, Jože, editor

Published
2006
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34. On Business Rules Automation: The BR-Centric IS Development Framework

Author

Valatkaite, Irma, Vasilecas, Olegas, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Eder, Johann, editor, Haav, Hele-Mai, editor, Kalja, Ahto, editor, and Penjam, Jaan, editor

Published
2005
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35. Analysis of Using Resources in Business Process Modeling and Simulation

Author

Vasilecas Olegas, Laureckas Evaldas, and Rima Audrius

Subjects
business process model and notation (bpmn), business process models, resources, resources models, resources modeling, resource aspect modeling, Computer software, QA76.75-76.765
Abstract

One of the key purposes of Business Process Model and Notation (BPMN) is to support graphical representation of the process model. However, such models have a lack of support for the graphical representation of resources, whose processes are used during simulation or execution of process instance. The paper analyzes different methods and their extensions for resource modeling. Further, this article presents a selected set of resource properties that are relevant for resource modeling. The paper proposes an approach that explains how to use the selected set of resource properties for extension of process modeling using BPMN and simulation tools. They are based on BPMN, where business process instances use resources in a concurrency manner.

Published
2014
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