Dejan Lavbič’s publications 53x

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2019 1x

Book chapter 1x

Marko Poženel and Dejan Lavbič. 2019. Discovering Language of Stocks, Frontiers in Artificial Intelligence and Applications - Databases and Information Systems X, 315, pp. 243–258, IOS Press.
HTML full text PDF full text Book link Publication link arXiv link ResearchGate link COBISS Google Scholar

@Incollection{pozenel_discovering_2019,
  Author = {Poženel, Marko and Lavbič, Dejan},
  Booktitle = {Databases and {Information} {Systems} {X},
  Note = {2019/DBISX},
  Pages = {243--258},
  Publisher = {IOS Press},
  Series = {Frontiers in {Artificial} {Intelligence} and {Applications},
  Title = {Discovering {Language} of {Stocks},
  Volume = {315},
  Year = {2019},
  Url = {https://doi.org/10.3233/978-1-61499-941-6-243},
  Isbn = {978-1-61499-941-6}
}

2018 3x

Journal 1x

Jan Robas and Dejan Lavbič. 2018. Poizvedovanje po povezanih podatkih s porazdelitvijo dela med strežnikom in odjemalcem, Uporabna informatika, 26(2), pp. 54–64.
HTML full text PDF full text Journal link Publication link ResearchGate link INSPEC COBISS SPARQL spletne tehnologije povezani podatki semantični splet procesiranje na odjemalcu

@Article{robas_poizvedovanje_2018,
  Author = {Robas, Jan and Lavbič, Dejan},
  Journal = {Uporabna informatika},
  Note = {2018/UI},
  Number = {2},
  Pages = {54--64},
  Title = {Poizvedovanje po povezanih podatkih s porazdelitvijo dela med strežnikom in odjemalcem},
  Volume = {26},
  Year = {2018},
  Issn = {1318-1882},
  Url = {https://uporabna-informatika.si/index.php/ui/article/view/1}
}

Na spletu je veliko podatkov, ki so objavljeni na različnih mestih v različnih, nezdružljivih oblikah. Zaradi tega nad njimi ne moremo izvajati poizvedb. Iskanje odgovora na specifično vprašanje ponavadi terja iskanje po ključnih besedah, branje in tolmačenje vsebine. To lahko rešimo tako, da uporabimo povezane podatke. Problem pri tem je dostopnost in učinkovitost poizvedovanja. V tem članku predstavimo obstoječo rešitev, ki omogoča poizvedovanje po povezanih podatkih tako, da je delo porazdeljeno med strežnikom in odjemalcem. Poleg tega predstavimo obstoječo razširitev, ki poveča učinkovitost in ne nazadnje našo lastno razširitev, s katero poskušamo učinkovitost še izboljšati. Našo razširitev primerjamo z že obstoječo razširitvijo in z osnovno različico omenjene rešitve.

Conference 2x

Sandi Gec, Dejan Lavbič, Marko Bajec and Vlado Stankovski. 2018. Smart contracts for container based video conferencing services: Architecture and implementation, Proceedings of 15th International Conference on the Economics of Grids, Clouds, Systems, and Services (GECON 2018), Pisa, Italy.
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@Inproceedings{gec_smart_2018,
  Address = {Pisa, Italy},
  Author = {Gec, Sandi and Lavbič, Dejan and Bajec, Marko and Stankovski, Vlado},
  Booktitle = {Proceedings of 15th {International} {Conference} on the {Economics} of {Grids}, {Clouds}, {Systems}, and {Services} ({GECON} 2018)},
  Note = {2018/GECON},
  Title = {Smart contracts for container based video conferencing services: {Architecture} and implementation},
  Year = {2018}
}

Today, container-based virtualization is very popular due to the lightweight nature of containers and the ability to use them flexibly in various heterogeneously composed systems. This makes it possible to collaboratively develop services by sharing various types of resources, such as infrastructures, software and digitalized content. In this work, our home made video-conferencing (VC) system is used to study resource usage optimisation in business context. An application like this, does not provide monetization possibilities to all involved stakeholders including end users, cloud providers, software engineers and similar. Blockchain related technologies, such as Smart Contracts (SC) offer a possibility to address some of these needs. We introduce a novel architecture for monetization of added-value according to preferences of the stakeholders that participate in joint software service offers. The developed architecture facilitates use case scenarios of service and resource offers according to fixed and dynamic pricing schemes, fixed usage period, prepaid quota for flexible usage, division of income, consensual decisions among collaborative service providers, and constrained based usage of resources or services. Our container-based VC service, which is based on the Jitsi Meet Open Source software is used to demonstrate the proposed architecture and the benefits of the investigated use cases.

Marko Poženel and Dejan Lavbič. 2018. What language do stocks speak?, Databases and Information Systems, DB&IS 2018, Communications in Computer and Information Science, Trakai, Vilnius.
HTML full text PDF full text PPT slides Conference link Publication link ResearchGate link Scopus Google Scholar Stock price prediction Trading strategy Word2Vec NLP

@Inproceedings{pozenel_what_2018,
  Address = {Trakai, Vilnius},
  Author = {Poženel, Marko and Lavbič, Dejan},
  Booktitle = {Databases and {Information} {Systems}, {DB}\&{IS} 2018, {Communications} in {Computer} and {Information} {Science},
  Note = {2018/BalticDBIS},
  Title = {What language do stocks speak?},
  Year = {2018},
  Doi = {10.1007/978-3-319-97571-9_27}
}

Stock prediction is a challenging and chaotic research area where many variables are included with their effects being complex to determine. Nevertheless, stock value prediction is still very appealing for researchers and investors since it might be profitable, yet the number of published research papers remains to be relatively small. The employment of advanced data analysis techniques has already been suggested by previous researches, such as the use of neural networks for stock price prediction, but practical implications of the the majority of approaches are limited as they are concerned mainly with a prediction accuracy and less with the success in real trading with consideration of trading fees. We propose a novel approach for stock trend prediction that combines Japanese candlesticks (OHLC trading data) and neural network based group of models Word2Vec. Word2Vec is usually utilized to produce word embeddings in natural language processing tasks, while we adopt it for acquiring semantic context of words in candlesticks’ sequence, where clustered candlesticks represent stock’s words. The approach is employed for the extraction of useful information from large sets of OHLC trading data to improve prediction accuracy. In evaluation of our approach we define a trading strategy and compare our approach with other popular prediction models – Buy & Hold, MA and MACD. The evaluation results on Russell Top 50 index are encouraging – the proposed Word2Vec approach outperformed all compared models on a test set with a statistical significance.

2017 5x

Journal 4x

Miloš Fidler and Dejan Lavbič. 2017. Improving information quality of Wikipedia articles with cooperative principle, Online Information Review, 41(6), pp. 797–811.
HTML full text PDF full text Journal link Publication link arXiv link ResearchGate link SCIE (Q₃) SSCI (Q₂) IF₂₀₁₇ = 1,675 COBISS WoS Scopus Google Scholar (2 citations) Conversation maxims Cooperative principle Improving information quality Information quality assessment and analysis Interrater reliability Presenting information in relevant way

@Article{fidler_improving_2017,
  Author = {Fidler, Miloš and Lavbič, Dejan},
  Journal = {Online Information Review},
  Note = {2017/OIR},
  Number = {6},
  Pages = {797--811},
  Title = {Improving information quality of {Wikipedia} articles with cooperative principle},
  Volume = {41},
  Year = {2017},
  Issn = {1468-4527},
  Url = {http://www.emeraldinsight.com/doi/10.1108/OIR-01-2016-0003},
  Doi = {10.1108/OIR-01-2016-0003}
}

Purpose: The purpose of this paper is to investigate the impact of cooperative principle on the information quality (IQ) by making objects more relevant for consumer needs, in particular case Wikipedia articles for students. Design/methodology/approach: The authors performed a quantitative study with participants being invited to complete an online survey. Each rater evaluated three selected and re-written articles from Wikipedia by four IQ dimensions (accuracy, completeness, objectivity, and representation). Grice’s maxims and submaxims were used to re-write articles and make them more relevant for student cognitive needs. The results were analyzed with statistical methods of mean, standard deviation, Cronbach’s α, and ICC (two-way random model of single measure). Findings: The study demonstrates that Wikipedia articles can be made more relevant for student needs by using cooperative principle with increase in IQ and also achieving higher consistency of students’ scores as recent research. In particular, students in the research perceived the abstract, constructed with cooperative principle, more objective and complete as reported in recent research. Practical implications: The work can benefit encyclopedia editors to improve IQ of existing articles as well as consumers that would obtain more relevant information in less reading time. Originality/value: This is one of the first attempts to empirically investigate the application of cooperate principle to make objects more relevant for consumer needs and impact of this on IQ. IQ improvement evidence is provided and impacts on IQ dimensions such as objectivity, completeness, accuracy, and representation for research community to validate and compare results.

Dejan Lavbič, Tadej Matek and Aljaž Zrnec. 2017. Learning SQL with Artificial Intelligent Aided Approach, International Journal of Information and Education Technology, 7(11), pp. 803–808.
PDF full text Journal link Publication link ResearchGate link INSPEC COBISS Google Scholar Intelligent Tutoring Systems Improving classroom teaching Interactive learning environments Programming and programming languages Recommender system SQL learning

@Article{lavbic_learning_2017,
  Author = {Lavbič, Dejan and Matek, Tadej and Zrnec, Aljaž},
  Journal = {International Journal of Information and Education Technology},
  Note = {2017/IJIET},
  Number = {11},
  Pages = {803--808},
  Title = {Learning {SQL} with {Artificial} {Intelligent} {Aided} {Approach},
  Volume = {7},
  Year = {2017},
  Issn = {20103689},
  Url = {http://www.ijiet.org/show-93-1116-1.html},
  Doi = {10.18178/ijiet.2017.7.11.976}
}

Efficient data manipulation and retrieval is a fundamental part of many business processes in the majority of todays’ companies. SQL, as a standard, is widely adopted and well accepted in this area. Students who set out to learn SQL frequently face difficulties. The learning process is to some extent inefficient, as the student’s knowledge is afterwards often inadequate. Several computer-aided systems have been developed to alleviate the problem. However, most of them are static and rigid, because the system’s knowledge is encoded manually. We propose a new system based on past attempts and solutions to SQL exercises. The proposed system is flexible and dynamic, as it adapts to the individual student and requires minimal intervention from domain experts. We show that the system is beneficial, in particular to students with low prior knowledge.

Dejan Lavbič, Tadej Matek and Aljaž Zrnec. 2017. Recommender system for learning SQL using hints, Interactive Learning Environments, 25(8), pp. 1048–1064.
HTML full text PDF full text Journal link Publication link arXiv link ResearchGate link SSCI (Q₂) IF₂₀₁₇ = 1,604 COBISS WoS Scopus (1 citation) Google Scholar (3 citations) Intelligent Tutoring Systems Improving classroom teaching Interactive learning environments Programming and programming languages Recommender system SQL learning

@Article{lavbic_recommender_2017,
  Author = {Lavbič, Dejan and Matek, Tadej and Zrnec, Aljaž},
  Journal = {Interactive Learning Environments},
  Note = {2017/NILE},
  Number = {8},
  Pages = {1048--1064},
  Title = {Recommender system for learning {SQL} using hints},
  Volume = {25},
  Year = {2017},
  Issn = {1049-4820},
  Url = {https://www.tandfonline.com/doi/full/10.1080/10494820.2016.1244084},
  Doi = {10.1080/10494820.2016.1244084}
}

Today’s software industry requires individuals who are proficient in as many programming languages as possible. Structured query language (SQL), as an adopted standard, is no exception, as it is the most widely used query language to retrieve and manipulate data. However, the process of learning SQL turns out to be challenging. The need for a computer-aided solution to help users learn SQL and improve their proficiency is vital. In this study, we present a new approach to help users conceptualize basic building blocks of the language faster and more efficiently. The adaptive design of the proposed approach aids users in learning SQL by supporting their own path to the solution and employing successful previous attempts, while not enforcing the ideal solution provided by the instructor. Furthermore, we perform an empirical evaluation with 93 participants and demonstrate that the employment of hints is successful, being especially beneficial for users with lower prior knowledge.

Aljaž Zrnec and Dejan Lavbič. 2017. Social network aided plagiarism detection: Social network aided plagiarism detection, British Journal of Educational Technology, 48(1), pp. 113–128.
HTML full text PDF full text Journal link Publication link arXiv link ResearchGate link SSCI (Q₁) IF₂₀₁₇ = 2,729 COBISS WoS Scopus (2 citations) Google Scholar (3 citations) Social Network Analysis Plagiarism detection process Plagiarism visualization Assessment Facilitation Learning management systems Student-centredness Case study

@Article{zrnec_social_2017,
  Author = {Zrnec, Aljaž and Lavbič, Dejan},
  Journal = {British Journal of Educational Technology},
  Note = {2017/BJET},
  Number = {1},
  Pages = {113--128},
  Title = {Social network aided plagiarism detection: {Social} network aided plagiarism detection},
  Volume = {48},
  Year = {2017},
  Issn = {00071013},
  Url = {http://doi.wiley.com/10.1111/bjet.12345},
  Doi = {10.1111/bjet.12345},
  Shorttitle = {Social network aided plagiarism detection}
}

The prevalence of different kinds of electronic devices and the volume of content on the Web have increased the amount of plagiarism, which is considered an unethical act. If we want to be efficient in the detection and prevention of these acts, we have to improve today’s methods of discovering plagiarism. The paper presents a research study where a framework for the improved detection of plagiarism is proposed. The framework focuses on the integration of social network information, information from the Web, and an advanced semantically enriched visualization of information about authors and documents that enables the exploration of obtained data by seeking of advanced patterns of plagiarism. To support the proposed framework, a special software tool was also developed. The statistical evaluation confirmed that the employment of social network analysis and advanced visualization techniques led to improvements in the confirmation and investigation stages of the plagiarism detection process, thereby enhancing the overall efficiency of the plagiarism detection process.

Conference 1x

Slavko Žitnik, Marko Bajec and Dejan Lavbič. 2017. LogMap+ : Relational data enrichment and linked data resources matching, 11th International conference on research challenges in Information Science (RCIS 2017), Brighton, UK.
PDF full text Conference link ResearchGate link COBISS Scopus (1 citation) Google Scholar (1 citation) ontology mapping ontology matching relational database OAEI

@Inproceedings{zitnik_logmap+_2017,
  Address = {Brighton, UK},
  Author = {Žitnik, Slavko and Bajec, Marko and Lavbič, Dejan},
  Booktitle = {11th {International} conference on research challenges in {Information} {Science} ({RCIS} 2017)},
  Note = {2017/RCIS},
  Pages = {267--275},
  Publisher = {IEEE},
  Series = {International {Conference} on {Research} {Challenges} in {Information} {Science},
  Title = {LogMap}+ : {Relational} data enrichment and linked data resources matching},
  Year = {2017},
  Isbn = {978-1-5090-5476-3}
}

Relational database to ontology mapping and ontology matching techniques are mostly addressed separately, even though it is known that the real power of semantic data lies in data interconnection. The latter is especially important when designing a new ontology, which often includes at least some of the concepts that already exist in the linked open data cloud. Thus, in this paper we describe a new end-to-end tool LogMap+ for transformation of relational data into an ontology and matching it against a pre-existent semantic source. Apart from offering the efficient web-based application, the main contributions are the improvements of the domain specific LogMap system. We evaluate our general tool against OAEI 2014 challenge datasets and achieve comparable results to the top performing algorithms and also outperform the domain specific LogMap tool.

2016 2x

Journal 2x

Tadej Matek and Dejan Lavbič. 2016. Adaptivni pristop k učenju jezika SQL, Uporabna informatika, 24(2), pp. 81–93.
PDF full text Journal link Publication link INSPEC COBISS inteligentni sistemi za učenje učenje jezika SQL odločitveni proces Markova razčlenjevalnik jezika SQL strojno učenje priporočilni sistemi

@Article{matek_adaptivni_2016,
  Author = {Matek, Tadej and Lavbič, Dejan},
  Journal = {Uporabna informatika},
  Note = {2016/UI},
  Number = {2},
  Pages = {81--93},
  Title = {Adaptivni pristop k učenju jezika {SQL},
  Volume = {24},
  Year = {2016},
  Issn = {1318-1882},
  Url = {http://stara.uporabna-informatika.si/stevilke/stevilka-16-2.aspx}
}

Jezik SQL je danes standard na področju poizvedovanja in manipulacije s podatki. Večina podjetij aktivno uporablja jezik SQL za podporo delovanja informacijskih sistemov, zato so potrebe po usposabljanju velike. Sam proces učenja jezika SQL je težaven, saj pogosto prihaja do napačnega razumevanja temeljnih konceptov jezika. V okviru naše raziskave smo se lotili razvoja adaptivnega sistema za generiranje namigov kot pomoč pri procesu učenja. Sistema uporablja informacije iz zgodovinskih podatkov, iz preteklih poskusov reševanja nalog iz jezika SQL. Za odkrivanje znanja, skritega v podatkih, smo uporabili odločitvene procese Markova, ki omogočajo napovedovanje v negotovih razmerah. Poleg sistema smo razvili tudi komponento za procesiranje jezika SQL ter preprost spletni vmesnik. Preprosta evalvacija je pokazala, da je sistem zmožen generirati namige, prilagojene posameznemu študentu.

Olegas Vasilecas, Diana Kalibatiene and Dejan Lavbič. 2016. Rule- and context-based dynamic business process modelling and simulation, Journal of Systems and Software, 122, pp. 1–15.
HTML full text PDF full text Journal link Publication link arXiv link ResearchGate link SCIE (Q₁) SCIE (Q₁) IF₂₀₁₇ = 2,444 COBISS WoS Scopus (5 citations) Google Scholar (10 citations) Context Business Rules Dynamic Business Process Simulation Business Process Modelling

@Article{vasilecas_rule-_2016,
  Author = {Vasilecas, Olegas and Kalibatiene, Diana and Lavbič, Dejan},
  Journal = {Journal of Systems and Software},
  Note = {2016/JSS},
  Pages = {1--15},
  Title = {Rule- and context-based dynamic business process modelling and simulation},
  Volume = {122},
  Year = {2016},
  Issn = {01641212},
  Url = {http://linkinghub.elsevier.com/retrieve/pii/S0164121216301509},
  Doi = {10.1016/j.jss.2016.08.048}
}

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.

2015 3x

Conference 3x

Miloš Fidler and Dejan Lavbič. 2015. Research About Measurability of Information Quality, 10th International Conference on Knowledge Management in Organisations (KMO 2015), Slovenia, Maribor.
PDF full text Conference link Publication link ResearchGate link COBISS Scopus Google Scholar (1 citation) Information quality Inter rater reliability Information quality dimensions Completeness Accuracy Objectivity Consistency Big data

@Inproceedings{fidler_research_2015,
  Address = {Slovenia, Maribor},
  Author = {Fidler, Miloš and Lavbič, Dejan},
  Booktitle = {10th {International} {Conference} on {Knowledge} {Management} in {Organisations} ({KMO} 2015)},
  Note = {2015/KMO},
  Title = {Research {About} {Measurability} of {Information} {Quality},
  Year = {2015},
  Url = {https://link.springer.com/chapter/10.1007/978-3-319-21009-4_21},
  Doi = {10.1007/978-3-319-21009-4_21}
}

This article will discuss on going research about Information Quality (IQ). Raters evaluating various IQ dimensions (accuracy, completeness, objectivity …) of same object showed low agreement level, therefore making IQ not measurable. Increase of IQ measurability to sufficient level would present an opportunity for guidelines to replace information of low with high quality. Speculations why IQ dimensions are not measurable have been made but at the same time mechanisms that improve agreement level have been proposed by researchers for validation. Moreover context in which information is being evaluated has not been yet addressed by existing research. This article will describe and explain a study that aims to create a robust model that will validate and measure effect of three different IQ aspects. Although this article is still work in progress, current results regarding research construction and preliminary testing will be presented as well as future steps.

Ana Bastinos Šaša and Dejan Lavbič. 2015. SPARQL-based framework for semantically-based event processing, Proceedings of the 25th International Conference on Information Modelling and Knowledge Bases (EJC 2015), Maribor, Slovenia.
PDF full text Conference link ResearchGate link COBISS Scopus Google Scholar (1 citation) event processing complex event ontology SPARQL RDF OWL

@Inproceedings{bastinos_sasa_sparql-based_2015,
  Address = {Maribor, Slovenia},
  Author = {Šaša, Ana Bastinos and Lavbič, Dejan},
  Booktitle = {Proceedings of the 25th {International} {Conference} on {Information} {Modelling} and {Knowledge} {Bases} ({EJC} 2015)},
  Note = {2015/EJC},
  Pages = {282--296},
  Title = {SPARQL}-based framework for semantically-based event processing},
  Year = {2015}
}

Event-driven architecture and complex event processing have become important topics in achieving business reactivity and proactivity. Even though many technologies to support this have been developed, there is still a need for providing support for complex events based on different levels of required expressivity. On the other hand, semantic technologies and semantic-based systems have emerged and are becoming more and more used, whereas there is no recognized solution for event processing in information systems based on semantic technologies. In this paper, we address these issues. We present a framework for ontology-based support for complex events, which allows for semantically enriched event definitions and automatic recognition. In order to automatically recognize complex events, an appropriate event definition basis has to be defined. The paper represents a continuation of our previous work by enhancing this basis and developing a SPARQL-based framework to provide a richer mechanism for event definitions and more efficient event detection. As a proof-of-concept, we provide an implementation of this framework using the semantic integration platform - Information Workbench. The implementation is available as an app that runs on top of the Information Workbench platform.

Aljaž Zrnec and Dejan Lavbič. 2015. The Role of Social Connections in Plagiarism Detection, Learning technology for education in cloud (LTEC 2015), Maribor, Slovenia.
PDF full text Conference link ResearchGate link COBISS WoS Scopus Google Scholar integration social network anaylsis plagiarism detection process plagiarism visualisation

@Inproceedings{zrnec_role_2015,
  Address = {Maribor, Slovenia},
  Author = {Zrnec, Aljaž and Lavbič, Dejan},
  Booktitle = {Learning technology for education in cloud ({LTEC} 2015)},
  Note = {2015/LTEC},
  Pages = {54--63},
  Series = {Communications in {Computer} and {Information} {Science},
  Title = {The {Role} of {Social} {Connections} in {Plagiarism} {Detection},
  Volume = {533},
  Year = {2015},
  Doi = {10.1007/978-3-319-22629-3_5},
  Isbn = {978-3-319-22629-3 978-3-319-22628-6}
}

Plagiarism is considered as an unethical act. Over the past few years its rate has increased considerably due to a widespread access to electronic documents on the Web. Existing tools for plagiarism detection are not efficient enough and if we want to successfully prevent these kind of acts we must improve today’s plagiarism detection approaches. The paper proposes a framework for improved detection of plagiarism, where we focus on integration of information from social networks, information from the Web and semantically enriched visualization of information about authors and plagiates. Visualization enables exploring data and seeking of advanced patterns of plagiarism. We also developed a special tool to support the proposed framework. The results of evaluation confirmed our hypothesis that employment of social network analysis and advanced visualization techniques improves plagiarism detection process.

2014 1x

Conference 1x

Andraž Hribernik, Lorand Dali, Dušan Omerčević and Dejan Lavbič. 2014. Applying multi-armed bandit on top of content similarity recommendation engine, Data science for news publishing at KDD 2014 (NewsKDD 2014), New York, USA.
PDF full text Conference link ResearchGate link COBISS Google Scholar (1 citation) exploration vs. exploitation recommendation systems mobile news

@Inproceedings{hribernik_applying_2014,
  Address = {New York, USA},
  Author = {Hribernik, Andraž and Dali, Lorand and Omerčević, Dušan and Lavbič, Dejan},
  Booktitle = {Data science for news publishing at {KDD} 2014 ({NewsKDD} 2014)},
  Note = {2014/NewsKDD},
  Pages = {1--5},
  Title = {Applying multi-armed bandit on top of content similarity recommendation engine},
  Year = {2014}
}

One of the goals of every news publisher is to prolong users’ browsing sessions by convincing them to read additional content besides the initially requested. Consequently, most news publishers use recommendation engines to keep users engaged by recommending them content which they might like to read next. In this paper we present how to improve an existing news recommendation system deployed on the mobile news site of one of Zemanta’s partners. With this publisher the users are browsing news sequentially by scrolling through a continuous stream of items on their mobile devices. Our goal is to order the recommended items in a way to increase probability that the users will click one them and read them. The existing system orders the recommendations by similarity to the article that the user is currently reading. We build on top of the content-similarity approach by also estimating the probability that the recommended item will be clicked. We use click-through data, and take a Bayesian approach to estimate the probability of a click; moreover, we propose the use of hierarchical models as a way of including data from contextually similar sessions into the estimation. The recommendations are performed using a multi-armed bandit approach. We try to find a trade-off between “exploitation” of items likely to perform well and “exploration” of items where not much data is available. When evaluated on data collected from a mobile news publisher, the proposed methods showed significant improvements compared to the existing system.

2013 4x

Journal 1x

Slavko Žitnik, Lovro Šubelj, Dejan Lavbič, Olegas Vasilecas and Marko Bajec. 2013. General Context-Aware Data Matching and Merging Framework, Informatica, 24(1), pp. 119–152.
HTML full text PDF full text Journal link Publication link arXiv link SCIE (Q₃) SCIE (Q₂) IF₂₀₁₃ = 0,901 COBISS WoS Scopus (1 citation) Google Scholar (4 citations) semantic elevation entity resolution redundancy elimination trust ontologies

@Article{zitnik_general_2013,
  Author = {Žitnik, Slavko and Šubelj, Lovro and Lavbič, Dejan and Vasilecas, Olegas and Bajec, Marko},
  Journal = {Informatica},
  Note = {2013/INFOR},
  Number = {1},
  Pages = {119--152},
  Title = {General {Context}-{Aware} {Data} {Matching} and {Merging} {Framework},
  Volume = {24},
  Year = {2013},
  Issn = {0868-4952},
  Url = {https://www.mii.lt/Informatica/htm/INFO902.htm}
}

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.

Conference 3x

Miloš Pavković, Dražen Drašković, Lovro Šubelj, Slavko Žitnik, Dejan Lavbič, Marko Janković, Jelica Protić and Boško Nikolić. 2013. Intelligent techniques for searching Internet forums, Proceedings of the 22nd International Electrotechnical and Computer Science Conference (ERK 2013), Portorož, Slovenia.
PDF full text COBISS Google Scholar (1 citation)

@Inproceedings{pavkovic_intelligent_2013,
  Address = {Portorož, Slovenia},
  Author = {Pavković, Miloš and Drašković, Dražen and Šubelj, Lovro and Žitnik, Slavko and Lavbič, Dejan and Janković, Marko and Protić, Jelica and Nikolić, Boško},
  Booktitle = {Proceedings of the 22nd {International} {Electrotechnical} and {Computer} {Science} {Conference} ({ERK} 2013)},
  Note = {2013/ERK},
  Title = {Intelligent techniques for searching {Internet} forums},
  Year = {2013}
}

Aljaž Zrnec, Dejan Lavbič, Neli Blagus, Marko Janković and Marko Bajec. 2013. Podatkovne baze vrste triplestore, Zbornik prispevkov 20. konference Dnevi slovenske informatike (DSI 2013), Portorož, Slovenia.
PDF full text COBISS

@Inproceedings{zrnec_podatkovne_2013,
  Address = {Portorož, Slovenia},
  Author = {Zrnec, Aljaž and Lavbič, Dejan and Blagus, Neli and Janković, Marko and Bajec, Marko},
  Booktitle = {Zbornik prispevkov 20. konference {Dnevi} slovenske informatike ({DSI} 2013)},
  Note = {2013/DSI},
  Pages = {1--10},
  Title = {Podatkovne baze vrste triplestore},
  Year = {2013}
}

Dejan Lavbič, Slavko Žitnik, Lovro Šubelj, Aleš Kumer, Aljaž Zrnec and Marko Bajec. 2013. Traversal and Relations Discovery among Business Entities and People using Semantic Web Technologies and Trust Management, Databases and Information Systems VII, 10th International Baltic Conference on Databases and Information Systems (Baltic DB&IS 2012), Vilnius, Lithuania.
PDF full text COBISS WoS Scopus (1 citation) Google Scholar (3 citations)

@Inproceedings{lavbic_traversal_2013,
  Address = {Vilnius, Lithuania},
  Author = {Lavbič, Dejan and Žitnik, Slavko and Šubelj, Lovro and Kumer, Aleš and Zrnec, Aljaž and Bajec, Marko},
  Booktitle = {Databases and {Information} {Systems} {VII}, 10th {International} {Baltic} {Conference} on {Databases} and {Information} {Systems} ({Baltic} {DB}\&{IS} 2012)},
  Note = {2013/BalticDBIS},
  Pages = {164--174},
  Publisher = {Vilnius Univ Inst Math \& Informat, Lithuanian Acad Sci; Lithuanian Comp Soc},
  Series = {Frontiers in {Artificial} {Intelligence} and {Applications},
  Title = {Traversal and {Relations} {Discovery} among {Business} {Entities} and {People} using {Semantic} {Web} {Technologies} and {Trust} {Management},
  Volume = {249},
  Year = {2013},
  Doi = {10.3233/978-1-61499-161-8-164},
  Isbn = {978-1-61499-161-8 978-1-61499-160-1}
}

There are several data silos containing information about business entities and people but are not semantically connected. If in integration process of data sources trust management is also employed than we can expect much higher success rate in relations discovery among entities. Majority of current mash-up approaches that deal with integration of information from several data sources omit or don’t fully address the aspect of trust. In this paper we discuss semantic integration of personal and business information from various data sources coupled with trust layer. The resulting system has higher and more defined solidity while trust for single entity and also for data source is defined. The case study presented in the paper focuses on integration of personal information from data sources mainly maintained by government authorities who have higher trustability than information from social networks, but we also include other less trusted sources. The developed SocioLeaks system allows users traversal and further relation discovery in a graph based manner.

2012 5x

Journal 2x

Dejan Lavbič and Marko Bajec. 2012. Employing semantic web technologies in financial instruments trading, International journal of new computer architectures and their applications, 2(1), pp. 167–182.
PDF full text Journal link Publication link ResearchGate link INSPEC COBISS Google Scholar (3 citations) ontology Semantic web financial instruments trading strategies rapid ontology development

@Article{lavbic_employing_2012,
  Author = {Lavbič, Dejan and Bajec, Marko},
  Journal = {International journal of new computer architectures and their applications},
  Note = {2012/IJNCAA},
  Number = {1},
  Pages = {167--182},
  Title = {Employing semantic web technologies in financial instruments trading},
  Volume = {2},
  Year = {2012},
  Issn = {2220-9085}
}

The lack of rapid approaches in ontology development led us to define Rapid Ontology Development (ROD) approach. The following approach includes the development process and constant evaluation of the steps in the process. The ROD approach was then applied to development of Financial Instruments and Trading Strategies (FITS) ontology. We pointed out that ontology development process does not conclude with successful definition of schematic part of ontology, but that developers should continue with post development activities where additional axiomatic information and instances with dynamic imports from various sources are defined. The result is executable ontology as part of Semantic Web application that can employ data from several data sources. The overall process of ontology development presented in this paper is suitable for users without extensive technical and programming skills.

Dejan Lavbič. 2012. Rapid ontology development model based on rule management approach in business applications, Informatica, 36(1), pp. 115–116.
PDF full text Journal link Publication link ResearchGate link INSPEC COBISS Scopus (1 citation) Google Scholar (2 citations) Business rules Methodologies for ontology development Ontologies Ontology evaluation Rapid ontology development ROD Semantic web

@Article{lavbic_rapid_2012,
  Author = {Lavbič, Dejan},
  Journal = {Informatica},
  Note = {2012/Informatica},
  Number = {1},
  Pages = {115--116},
  Title = {Rapid ontology development model based on rule management approach in business applications},
  Volume = {36},
  Year = {2012},
  Issn = {0350-5596}
}

In this paper rapid ontology development with emphasis on facilitating development with constant evaluation of steps in the process of ontology development is presented. The review of related work pointed out that existing methodologies for ontology development are complex and high level of technical knowledge is required. Business users and developers usually don’t pose such knowledge therefore ontology completeness indicator was introduced in this approach. The role of this indicator is to guide developer throughout the development process and constantly aid user with recommendations to progress to next step and improve the quality of ontology. While evaluating the ontology, several aspects are considered; from description, partition, consistency, redundancy and to anomaly. The approach was verified on Financial Instruments and Trading Strategies (FITS) ontology and compared to other approaches.

Conference 3x

Slavko Žitnik, Lovro Šubelj, Dejan Lavbič, Aljaž Zrnec and Marko Bajec. 2012. Collective information extraction using first-order probabilistic models, ACM International Conference Proceeding Series (5th Balkan Conference in Informatics (BCI 2012)), Novi Sad, Serbia.
PDF full text COBISS Scopus (3 citations) Google Scholar (7 citations)

@Inproceedings{zitnik_collective_2012,
  Address = {Novi Sad, Serbia},
  Author = {Žitnik, Slavko and Šubelj, Lovro and Lavbič, Dejan and Zrnec, Aljaž and Bajec, Marko},
  Booktitle = {ACM} {International} {Conference} {Proceeding} {Series} (5th {Balkan} {Conference} in {Informatics} ({BCI} 2012))},
  Note = {2012/BCI},
  Pages = {279--282},
  Publisher = {ACM},
  Title = {Collective information extraction using first-order probabilistic models},
  Year = {2012},
  Doi = {10.1145/2371316.2371377}
}

Traditional information extraction (IE) tasks roughly consist of named-entity recognition, relation extraction and coreference resolution. Much work in this area focuses primarily on separate subtasks where best performance can be achieved only on specialized domains. In this paper we present a collective IE approach combining all three tasks by employing linear-chain conditional random fields. The usage of probabilistic models enables us to easily communicate between tasks on the fly and error correction during the iterative process execution. We introduce a novel iterative-based IE system architecture with additional semantic and collective feature functions. Proposed system is evaluated against real-world data set, introduced in the paper, and results are better over traditional approaches on two tested tasks by error reduction and performance improvements.

Lovro Šubelj, Slavko Žitnik, Aljaž Zrnec, Aleš Kumer, Bojan Klemenc, Dejan Lavbič and Marko Bajec. 2012. Lastnosti velikih realnih omrežij in primeri uporabe, Zbornik prispevkov 19. konference Dnevi slovenske informatike (DSI 2012), Portorož, Slovenia.
PDF full text COBISS

@Inproceedings{subelj_lastnosti_2012,
  Address = {Portorož, Slovenia},
  Author = {Šubelj, Lovro and Žitnik, Slavko and Zrnec, Aljaž and Kumer, Aleš and Klemenc, Bojan and Lavbič, Dejan and Bajec, Marko},
  Booktitle = {Zbornik prispevkov 19. konference {Dnevi} slovenske informatike ({DSI} 2012)},
  Note = {2012/DSI-2},
  Pages = {1--10},
  Title = {Lastnosti velikih realnih omrežij in primeri uporabe},
  Year = {2012}
}

Aljaž Zrnec, Dejan Lavbič, Lovro Šubelj, Slavko Žitnik, Aleš Kumer and Marko Bajec. 2012. Podatkovne baze NoSQL, Zbornik prispevkov 19. konference Dnevi slovenske informatike (DSI 2012), Portorož, Slovenia.
PDF full text COBISS

@Inproceedings{zrnec_podatkovne_2012,
  Address = {Portorož, Slovenia},
  Author = {Zrnec, Aljaž and Lavbič, Dejan and Šubelj, Lovro and Žitnik, Slavko and Kumer, Aleš and Bajec, Marko},
  Booktitle = {Zbornik prispevkov 19. konference {Dnevi} slovenske informatike ({DSI} 2012)},
  Note = {2012/DSI-1},
  Title = {Podatkovne baze {NoSQL},
  Year = {2012}
}

2011 6x

Journal 2x

Aljaž Zrnec and Dejan Lavbič. 2011. Comparison of cloud vs. tape backup performance and costs with oracle database, Journal of Information and Organizational Sciences, 35(1), pp. 135–142.
PDF full text Journal link Publication link ResearchGate link INSPEC COBISS Scopus (2 citations) Google Scholar (4 citations) computer center bandwidth service cloud performance cost remote location

@Article{zrnec_comparison_2011,
  Author = {Zrnec, Aljaž and Lavbič, Dejan},
  Journal = {Journal of Information and Organizational Sciences},
  Note = {2011/JIOS},
  Number = {1},
  Pages = {135--142},
  Title = {Comparison of cloud vs. tape backup performance and costs with oracle database},
  Volume = {35},
  Year = {2011}
}

Current practice of backing up data is based on using backup tapes and remote locations for storing data. Nowadays, with the advent of cloud computing a new concept of database backup emerges. The paper presents the possibility of making backup copies of data in the cloud. We are mainly focused on performance and economic issues of making backups in the cloud in comparison to traditional backups. We tested the performance and overall costs of making backup copies of data in Oracle database using Amazon S3 and EC2 cloud services. The costs estimation was performed on the basis of the prices published on Amazon S3 and Amazon EC2 sites.

Lovro Šubelj, David Jelenc, Eva Zupančič, Dejan Lavbič, Denis Trček, Marjan Krisper and Marko Bajec. 2011. Merging data sources based on semantics, contexts and trust, IPSI BgD Transactions on Internet Research, 7(1), pp. 18–30.
PDF full text ResearchGate link COBISS Google Scholar (5 citations) merging data semantic elevation context trust management entity resolution redundancy elimination

@Article{subelj_merging_2011,
  Author = {Šubelj, Lovro and Jelenc, David and Zupančič, Eva and Lavbič, Dejan and Trček, Denis and Krisper, Marjan and Bajec, Marko},
  Journal = {IPSI BgD Transactions on Internet Research},
  Note = {2011/IPSI},
  Number = {1},
  Pages = {18--30},
  Title = {Merging data sources based on semantics, contexts and trust},
  Volume = {7},
  Year = {2011}
}

Matching and merging of data from heterogeneous sources is a common need in various scenarios. Despite numerous algorithms proposed in the recent literature, there is a lack of general and complete solutions combining different dimensions arising during the matching and merging execution. We propose a general framework, and accompanying algorithms, that allow joint control over various dimensions of matching and merging. To achieve superior performance, standard (relational) data representation is enriched with semantics and thus elevated towards the real world situation. Data sources are merged using collective entity resolution and redundancy elimination algorithms that are managed through the use of different contexts – user, data and also trust contexts. Introduction of trust allows for an adequate trust management and efficient security assurance which is, besides a general solution for matching and merging, the main novelty of the proposition.

Conference 4x

Dejan Lavbič, Marjan Krisper and Marko Bajec. 2011. Continuous Evaluation in the process of Ontology Development, Proceedings of the 6th International conference on internet and web applications and services (ICIW 2011), 1st International workshop on enterprise cloud computing - strategies and solutions (ECCSS 2011), St. Maarten, Netherlands.
PDF full text COBISS WoS Google Scholar

@Inproceedings{lavbic_continuous_2011,
  Address = {St. Maarten, Netherlands},
  Author = {Lavbič, Dejan and Krisper, Marjan and Bajec, Marko},
  Booktitle = {Proceedings of the 6th {International} conference on internet and web applications and services ({ICIW} 2011), 1st {International} workshop on enterprise cloud computing - strategies and solutions ({ECCSS} 2011)},
  Note = {2011/ICIW},
  Pages = {231--236},
  Publisher = {IARIA},
  Title = {Continuous {Evaluation} in the process of {Ontology} {Development},
  Year = {2011},
  Isbn = {978-1-61208-124-3}
}

Due to complexity of existing methodologies for ontology development we propose facilitating ontology development with continuous evaluation of steps in the process of ontology development. The approach is called Rapid Ontology Development (ROD) and is based on completeness indicator that helps guiding developer by constant evaluation of ontology and producing recommendations to progress to next step and improve the quality of ontology. The applicability of the approach is demonstrated on Financial Instruments and Trading Strategies (FITS) ontology. The main contribution of the paper is the suggested approach for rapid development of ontologies which brings ontology modeling closer to business users as it does not require from users to know any formal syntax.

Marko Bajec, Dejan Lavbič, Tomaž Vidonja and Andrej Kos. 2011. OCCAPI - odprta inteligentna komunikacijska platforma, Informatika v luči reforme javne uprave - zbornik konference Informatika v javni upravi 2011 (IJU 2011), Brdo pri Kranju, Slovenia.
PDF full text COBISS

@Inproceedings{bajec_occapi_2011,
  Address = {Brdo pri Kranju, Slovenia},
  Author = {Bajec, Marko and Lavbič, Dejan and Vidonja, Tomaž and Kos, Andrej},
  Booktitle = {Informatika v luči reforme javne uprave - zbornik konference {Informatika} v javni upravi 2011 ({IJU} 2011)},
  Note = {2011/IJU-1},
  Title = {OCCAPI} - odprta inteligentna komunikacijska platforma},
  Year = {2011}
}

Dejan Lavbič and Marko Bajec. 2011. Rapid development of executable ontology for financial instruments and trading strategies, 2nd International Conference on Software Engineering and Computing Systems (ICSECS 2011), Software Engineering and Computer Systems, Part 1, Kuantan, Malaysia.
PDF full text Conference link Publication link ResearchGate link INSPEC COBISS WoS Scopus Google Scholar (1 citation) ontology Semantic web financial instruments trading strategies rapid ontology development

@Inproceedings{lavbic_rapid_2011,
  Address = {Kuantan, Malaysia},
  Author = {Lavbič, Dejan and Bajec, Marko},
  Booktitle = {2nd {International} {Conference} on {Software} {Engineering} and {Computing} {Systems} ({ICSECS} 2011), {Software} {Engineering} and {Computer} {Systems}, {Part} 1},
  Note = {2011/ICSECS},
  Pages = {232--243},
  Publisher = {Springer},
  Series = {Communications in {Computer} and {Information} {Science},
  Title = {Rapid development of executable ontology for financial instruments and trading strategies},
  Volume = {179},
  Year = {2011},
  Isbn = {978-3-642-22169-9}
}

In this paper we employ Rapid Ontology Development approach (ROD) with constant evaluation of steps in the process of ontology construction for development of Financial Instruments and Trading Strategies (FITS) ontology. We show that ontology development process does not conclude with successful definition of schematic part of ontology but we continue with post development activities where additional axiomatic information and instances with dynamic imports from various sources are defined. The result is executable ontology as part of Semantic Web application that uses data from several semi structured sources. The overall process of construction is suitable for users without extensive technical and programming skills and those users are rather experts in the problem domain.

Marko Bajec, Stefan Furlan, Aleš Kumer, Lovro Šubelj, Slavko Žitnik and Dejan Lavbič. 2011. Supervizor+, Informatika v luči reforme javne uprave - zbornik konference Informatika v javni upravi 2011 (IJU 2011), Brdo pri Kranju, Slovenia.
PDF full text COBISS

@Inproceedings{bajec_supervizor+_2011,
  Address = {Brdo pri Kranju, Slovenia},
  Author = {Bajec, Marko and Furlan, Stefan and Kumer, Aleš and Šubelj, Lovro and Žitnik, Slavko and Lavbič, Dejan},
  Booktitle = {Informatika v luči reforme javne uprave - zbornik konference {Informatika} v javni upravi 2011 ({IJU} 2011)},
  Note = {2011/IJU-2},
  Title = {Supervizor+},
  Year = {2011}
}

2010 6x

Journal 3x

Dejan Lavbič and Marjan Krisper. 2010. Facilitating Ontology Development with Continuous Evaluation, Informatica, 21(4), pp. 533–552.
HTML full text PDF full text Journal link Publication link arXiv link ResearchGate link SCIE (Q₂) SCIE (Q₁) IF₂₀₁₀ = 1,786 COBISS WoS Scopus (9 citations) Google Scholar (13 citations) Semantic web rapid ontology development ontology development methodology ontology evaluation ontology completeness

@Article{lavbic_facilitating_2010,
  Author = {Lavbič, Dejan and Krisper, Marjan},
  Journal = {Informatica},
  Note = {2010/INFOR},
  Number = {4},
  Pages = {533--552},
  Title = {Facilitating {Ontology} {Development} with {Continuous} {Evaluation},
  Volume = {21},
  Year = {2010},
  Issn = {0868-4952},
  Url = {https://www.mii.lt/Informatica/htm/INFO805.htm}
}

In this paper we propose facilitating ontology development by constant evaluation of steps in the process of ontology development. Existing methodologies for ontology development are complex and they require technical knowledge that business users and developers don’t poses. By introducing ontology completeness indicator developer is guided throughout the development process and constantly aided by recommendations to progress to next step and improve the quality of ontology. In evaluating the ontology, several aspects are considered; from description, partition, consistency, redundancy and to anomaly. The applicability of the approach was demonstrated on Financial Instruments and Trading Strategies (FITS) ontology with comparison to other approaches.

Dejan Lavbič, Iztok Lajovic and Marjan Krisper. 2010. Facilitating information system development with Panoramic view on data, Computer Science and Information Systems, 7(4), pp. 737–767.
HTML full text PDF full text Journal link Publication link arXiv link ResearchGate link SCIE (Q₄) SCIE (Q₄) IF₂₀₁₀ = 0,324 COBISS WoS Scopus (4 citations) Google Scholar (7 citations) software development associative thinking object recognition rapid application development

@Article{lavbic_facilitating_2010-1,
  Author = {Lavbič, Dejan and Lajovic, Iztok and Krisper, Marjan},
  Journal = {Computer Science and Information Systems},
  Note = {2010/ComSIS},
  Number = {4},
  Pages = {737--767},
  Title = {Facilitating information system development with {Panoramic} view on data},
  Volume = {7},
  Year = {2010},
  Issn = {1820-0214},
  Doi = {10.2298/CSIS091122031L}
}

The increasing amount of information and the absence of an effective tool for assisting users with minimal technical knowledge lead us to use associative thinking paradigm for implementation of a software solution - Panorama. In this study, we present object recognition process, based on context + focus information visualization techniques, as a foundation for realization of Panorama. We show that user can easily define data vocabulary of selected domain that is furthermore used as the application framework. The purpose of Panorama approach is to facilitate software development of certain problem domains by shortening the Software Development Life Cycle with minimizing the impact of implementation, review and maintenance phase. Our approach is focused on using and updating data vocabulary by users without extensive programming skills. Panorama therefore facilitates traversing through data by following associations where user does not need to be familiar with the query language, the data structure and does not need to know the problem domain fully. Our approach has been verified by detailed comparison to existing approaches and in an experiment by implementing selected use cases. The results confirmed that Panorama fits problem domains with emphasis on data oriented rather than ones with process oriented aspects. In such cases the development of selected problem domains is shortened up to 25%, where emphasis is mainly on analysis, logical design and testing, while omitting physical design and programming, which is performed automatically by Panorama tool.

Dejan Lavbič, Olegas Vasilecas and Rok Rupnik. 2010. Ontology-based multi-agent system to support business users and management, Technological and Economic Development of Economy, 16(2), pp. 327–347.
HTML full text PDF full text Journal link Publication link arXiv link ResearchGate link SSCI (Q₁) IF₂₀₁₀ = 5,605 COBISS WoS Scopus (15 citations) Google Scholar (21 citations) Decision support Agent Multi-Agent System Ontology Data Warehouse Information Retrieval Business Rules Business Process Management

@Article{lavbic_ontology-based_2010,
  Author = {Lavbič, Dejan and Vasilecas, Olegas and Rupnik, Rok},
  Journal = {Technological and Economic Development of Economy},
  Note = {2010/TEDE},
  Number = {2},
  Pages = {327--347},
  Title = {Ontology-based multi-agent system to support business users and management},
  Volume = {16},
  Year = {2010},
  Issn = {1392-8619},
  Url = {https://www.tandfonline.com/doi/abs/10.3846/tede.2010.21},
  Doi = {10.3846/tede.2010.21}
}

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.

Conference 3x

Lovro Šubelj, Neli Blagus, Stefan Furlan, Bojan Klemenc, Aleš Kumer, Dejan Lavbič, Aljaž Zrnec, Slavko Žitnik and Marko Bajec. 2010. Analiza kompleksnih omrežij - osnovni pojmi in primeri uporabe v praksi, Informatika kot gonilo razvoja javne uprave - zbornik konference Informatika v javni upravi (IJU 2010), Brdo pri Kranju, Slovenia.
PDF full text COBISS Google Scholar (2 citations)

@Inproceedings{subelj_analiza_2010,
  Address = {Brdo pri Kranju, Slovenia},
  Author = {Šubelj, Lovro and Blagus, Neli and Furlan, Stefan and Klemenc, Bojan and Kumer, Aleš and Lavbič, Dejan and Zrnec, Aljaž and Žitnik, Slavko and Bajec, Marko},
  Booktitle = {Informatika kot gonilo razvoja javne uprave - zbornik konference {Informatika} v javni upravi ({IJU} 2010)},
  Note = {2010/IJU-1},
  Pages = {1--10},
  Title = {Analiza kompleksnih omrežij - osnovni pojmi in primeri uporabe v praksi},
  Year = {2010}
}

Dejan Lavbič and Aljaž Zrnec. 2010. Ontology based agent system, Proceedings of the 2nd International conference on Information Society and Information Technologies (ISIT 2010), Novo mesto, Slovenia.
PDF full text COBISS

@Inproceedings{lavbic_ontology_2010,
  Address = {Novo mesto, Slovenia},
  Author = {Lavbič, Dejan and Zrnec, Aljaž},
  Booktitle = {Proceedings of the 2nd {International} conference on {Information} {Society} and {Information} {Technologies} ({ISIT} 2010)},
  Note = {2010/ISIT},
  Pages = {1--6},
  Title = {Ontology based agent system},
  Year = {2010}
}

Slavko Žitnik, Bojan Klemenc, Dejan Lavbič, Lovro Šubelj, Stefan Furlan, Aleš Kumer, Aljaž Zrnec, Neli Blagus and Marko Bajec. 2010. Trendi v inteligentnem pridobivanju podatkov iz heterogenih virov, Informatika kot gonilo razvoja javne uprave - zbornik konference Informatika v javni upravi (IJU 2010), Brdo pri Kranju, Slovenia.
PDF full text COBISS

@Inproceedings{zitnik_trendi_2010,
  Address = {Brdo pri Kranju, Slovenia},
  Author = {Žitnik, Slavko and Klemenc, Bojan and Lavbič, Dejan and Šubelj, Lovro and Furlan, Stefan and Kumer, Aleš and Zrnec, Aljaž and Blagus, Neli and Bajec, Marko},
  Booktitle = {Informatika kot gonilo razvoja javne uprave - zbornik konference {Informatika} v javni upravi ({IJU} 2010)},
  Note = {2010/IJU-2},
  Pages = {1--12},
  Title = {Trendi v inteligentnem pridobivanju podatkov iz heterogenih virov},
  Year = {2010}
}

2009 2x

Journal 1x

Dejan Lavbič and Rok Rupnik. 2009. Multi-agent system for decision support in enterprises, Journal of Information and Organizational Sciences, 33(2), pp. 269–284.
PDF full text Journal link Publication link ResearchGate link INSPEC COBISS Scopus (13 citations) Google Scholar (17 citations) ontology intelligent agent business rules data warehouse information retrieval

@Article{lavbic_multi-agent_2009,
  Author = {Lavbič, Dejan and Rupnik, Rok},
  Journal = {Journal of Information and Organizational Sciences},
  Note = {2009/JIOS},
  Number = {2},
  Pages = {269--284},
  Title = {Multi-agent system for decision support in enterprises},
  Volume = {33},
  Year = {2009}
}

Business decisions must rely not only on organisation’s internal data but also on external data from competitors or relevant events. This information can be obtained from the Web but must be integrated with the data in an organisation’s Data Warehouse (DW). In this paper we discuss the agent-based integration approach using ontologies. To enable common understanding of a domain between people and application systems we introduce business rules approach towards ontology management. Because knowledge in organisation’s ontologies is acquired from business users without technical knowledge simple user interface based on ontology restrictions and predefined templates are used. After data from internal DW, Web and business rules are acquired; agent can deduce new knowledge and therefore facilitate decision making process. Tasks like information retrieval from competitors, creating and reviewing OLAP reports are autonomously performed by agents, while business users have control over their execution through knowledge base in ontology. The approach presented in the paper was verified on the case study from the domain of mobile communications with the emphasis on supply and demand of mobile phones and its accessories.

Conference 1x

Dejan Lavbič. 2009. Možnosti uporabe ontologij pri arhitekturi e-uprave, Povežimo informacijske otoke - zbornik konference Informatika v javni upravi (IJU 2009), Brdo pri Kranju, Slovenia.
PDF full text COBISS

@Inproceedings{lavbic_moznosti_2009,
  Address = {Brdo pri Kranju, Slovenia},
  Author = {Lavbič, Dejan},
  Booktitle = {Povežimo informacijske otoke - zbornik konference {Informatika} v javni upravi ({IJU} 2009)},
  Note = {2009/IJU},
  Pages = {1--9},
  Title = {Možnosti uporabe ontologij pri arhitekturi e-uprave},
  Year = {2009}
}

2008 2x

Journal 1x

Dejan Lavbič and Matjaž Gams. 2008. Agenti ali samo še en objektno usmerjen pristop?, Uporabna informatika, 16(3), pp. 162–170.
PDF full text COBISS

@Article{lavbic_agenti_2008,
  Author = {Lavbič, Dejan and Gams, Matjaž},
  Journal = {Uporabna informatika},
  Note = {2008/UI},
  Number = {3},
  Pages = {162--170},
  Title = {Agenti ali samo še en objektno usmerjen pristop?},
  Volume = {16},
  Year = {2008}
}

Conference 1x

Dejan Lavbič and Marjan Krisper. 2008. Rapid ontology development model based on business rules management approach for the use in business applications, Proceedings of the 6th Doctoral Consortium on Enterprise Information Systems (DCEIS 2008) - In conjunction with 10th International Conference on Enterprise Information Systems (ICEIS 2008), Barcelona, Spain.
PDF full text COBISS Scopus Google Scholar (3 citations)

@Inproceedings{lavbic_rapid_2008,
  Address = {Barcelona, Spain},
  Author = {Lavbič, Dejan and Krisper, Marjan},
  Booktitle = {Proceedings of the 6th {Doctoral} {Consortium} on {Enterprise} {Information} {Systems} ({DCEIS} 2008) - {In} conjunction with 10th {International} {Conference} on {Enterprise} {Information} {Systems} ({ICEIS} 2008)},
  Note = {2008/DCEIS},
  Pages = {24--35},
  Title = {Rapid ontology development model based on business rules management approach for the use in business applications},
  Year = {2008},
  Isbn = {978-989-8111-41-8}
}

Ontologies as means for knowledge manipulation in IT have gained its popularity in recent years. The scenarios of successful implementation can mainly be found in the World Wide Web domain and within academia while there are only a few in business environment. This paper introduces Rapid Ontologfy Development model and accompanying intelliOnto support tool to facilitate ontology construction for inclusion in business applications. Emphasis is given to simplification of the development process of functional components by bridging the gap between formal syntax of captured knowledge and acquisition of knowledge in semi formal way. Verification of the model will be presented with running examples from the domain of financial portfolio management and organisation of a rent-a-car etc.

2007 1x

Conference 1x

Dejan Lavbič, Rok Rupnik, Marko Bajec and Marjan Krisper. 2007. Agent oriented approach for integration of BI systems, Proceedings of 29th International Conference on Information Technology Interfaces (ITI 2007), Dubrovnik, Croatia.
PDF full text COBISS Scopus (1 citation) Google Scholar (3 citations)

@Inproceedings{lavbic_agent_2007,
  Address = {Dubrovnik, Croatia},
  Author = {Lavbič, Dejan and Rupnik, Rok and Bajec, Marko and Krisper, Marjan},
  Booktitle = {Proceedings of 29th {International} {Conference} on {Information} {Technology} {Interfaces} ({ITI} 2007)},
  Note = {2007/ITI},
  Pages = {133--138},
  Title = {Agent oriented approach for integration of {BI} systems},
  Year = {2007},
  Url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-48349104807&doi=10.1109%2fITI.2007.4283758&partnerID=40&md5=aa206c378ff99bceeb90677bb24d1042},
  Doi = {10.1109/ITI.2007.4283758}
}

Decision Support in enterprises is gaining its importance in the age of Internet and e-business. While dealing with the need for fast response in the dynamic competitive environments and rapid increase of information available on various networks we propose Multi-Agent System approach to backend Decision Support. Research case study presented in the paper is from the domain of mobile communications with system’s main goal of delivering right information at the right time to the right users. We integrate several BI systems such as Data Mining and Data Warehousing with information available on the Internet. Ontologies are used to store derived knowledge, to support knowledge exchange between our MAS and other systems, to support agent-to-agent communication and enable seamless extending of MAS capabilities.

2006 5x

Journal 2x

Bogdan Kronovšek, Dejan Lavbič and Marjan Krisper. 2006. Mobilnost pri agentno usmerjenem razvoju programske opreme, Uporabna informatika, 14(4), pp. 182–195.
PDF full text Journal link INSPEC COBISS

@Article{kronovsek_mobilnost_2006,
  Author = {Kronovšek, Bogdan and Lavbič, Dejan and Krisper, Marjan},
  Journal = {Uporabna informatika},
  Note = {2006/UI},
  Number = {4},
  Pages = {182--195},
  Title = {Mobilnost pri agentno usmerjenem razvoju programske opreme},
  Volume = {14},
  Year = {2006},
  Issn = {1318-1882}
}

Paradigma mobilnosti programske kode in inteligentnih agentov sta se zdruţili pri mobilnih agentih. Mobilni agenti so aktivne entitete, ki se selijo iz enega izvajalnega okolja v drugega, pri tem pa srečujejo druge agente, uporabljajo storitve in vire, ki so tam na voljo, medtem ko za poslovnega uporabnika izvršujejo določeno nalogo. Zaenkrat so še vedno bolj v domeni raziskovalnih krogov, kljub temu pa so obeti uporabe tega pristopa pri razvoju programske opreme veliki. Z razvojem kvalitetnih in zanesljivih platform, ki omogočajo implementacijo mobilnih agentov, se je zanimanje zanje zelo povečalo. Njihova uporabnost in prednosti pa se izkaţejo predvsem pri večjih omreţnih sistemih in internetu. Študija primera razvoja mobilnega agenta, ki ga prispevek predstavlja, je s področja poslovnega obveščanja, zdruţuje pa koncept mobilnih agentov in koncept mobilnega uporabnika.

Dejan Lavbič, Marko Bajec and Marjan Krisper. 2006. Pravila na semantičnem spletu, Elektrotehniški vestnik / Electrotechnical review, 73(5), pp. 249–254.
PDF full text Journal link Publication link ResearchGate link INSPEC COBISS Scopus Google Scholar (2 citations) semantični splet RuleML SWRL pravila

@Article{lavbic_pravila_2006,
  Author = {Lavbič, Dejan and Bajec, Marko and Krisper, Marjan},
  Journal = {Elektrotehniški vestnik / Electrotechnical review},
  Note = {2006/EV},
  Number = {5},
  Pages = {249--254},
  Title = {Pravila na semantičnem spletu},
  Volume = {73},
  Year = {2006},
  Shorttitle = {Pravila na semantičnem spletu}
}

Jeziki za predstavitev pravil imajo čedalje pomembnejšo vlogo pri uveljavljanju semantičnega spleta. Po eni strani pravila omogočajo zapis deklarativnega znanja pri jezikih za predstavitev ontologij in izražajo omejitve ali pretvorbe, ki so povezane z opisno logiko. Po drugi strani pa lahko s pravili opredelimo uveljavljanje politik, odzivanje na spremembe, specifikacijo delovanja inteligentnih agentov in jih uporabimo še za številne druge namene. Jeziki za predstavitev pravil bodo tako igrali ključno vlogo, saj bodo kot lingua franca za izmenjavo pravil med različnimi sistemi in orodji ter bodo omogočali razvijanje, izvajanje, objavljanje in medsebojno komunikacijo pravil na semantičnem spletu. V članku je predstavljeno ogrodje za predstavitev znanja na semantičnem spletu, kjer je poudarek na integraciji ontologij in pravil. Povezovanje je izpeljano s pomočjo pretvornikov, saj trenutno ni podpore za izvajanje pravil v obliki SWRL, ki je eden najobetavnejših predlogov pravil na semantičnem spletu.

Conference 3x

Dejan Lavbič and Viljan Mahnič. 2006. Intelligent agent aided use of unstructured information in decision support, Zbornik 9. mednarodne multikonference Informacijska družba (IS 2006), Ljubljana, Slovenia.
PDF full text COBISS Google Scholar

@Inproceedings{lavbic_intelligent_2006,
  Address = {Ljubljana, Slovenia},
  Author = {Lavbič, Dejan and Mahnič, Viljan},
  Booktitle = {Zbornik 9. mednarodne multikonference {Informacijska} družba ({IS} 2006)},
  Note = {2006/IS},
  Pages = {1--5},
  Title = {Intelligent agent aided use of unstructured information in decision support},
  Year = {2006}
}

Dejan Lavbič and Ana Bastinos Šaša. 2006. Knowledge management in multi-agent systems, Knowledge Management in Organizations - proocedings of the 1st International conference for new trends in Knowledge Management (KMO 2006), Maribor, Slovenia.
PDF full text COBISS Google Scholar (1 citation)

@Inproceedings{lavbic_knowledge_2006,
  Address = {Maribor, Slovenia},
  Author = {Lavbič, Dejan and Šaša, Ana Bastinos},
  Booktitle = {Knowledge {Management} in {Organizations} - proocedings of the 1st {International} conference for new trends in {Knowledge} {Management} ({KMO} 2006)},
  Note = {2006/KMO},
  Pages = {128--133},
  Title = {Knowledge management in multi-agent systems},
  Year = {2006}
}

Dejan Lavbič and Marjan Krisper. 2006. Semantične spletne storitve, V partnerstvu z informatiko do poslovne odličnosti - zbornik prispevkov 13. konference Dnevi slovenske informatike (DSI 2006), Portorož, Slovenia.
PDF full text COBISS

@Inproceedings{lavbic_semanticne_2006,
  Address = {Portorož, Slovenia},
  Author = {Lavbič, Dejan and Krisper, Marjan},
  Booktitle = {V partnerstvu z informatiko do poslovne odličnosti - zbornik prispevkov 13. konference {Dnevi} slovenske informatike ({DSI} 2006)},
  Note = {2006/DSI},
  Pages = {1--7},
  Title = {Semantične spletne storitve},
  Year = {2006}
}

2005 6x

Journal 1x

Dejan Lavbič and Marjan Krisper. 2005. Semantika podatkov in ontologije, Uporabna informatika, 13(3), pp. 121–135.
PDF full text Journal link INSPEC COBISS Google Scholar (4 citations)

@Article{lavbic_semantika_2005,
  Author = {Lavbič, Dejan and Krisper, Marjan},
  Journal = {Uporabna informatika},
  Note = {2005/UI},
  Number = {3},
  Pages = {121--135},
  Title = {Semantika podatkov in ontologije},
  Volume = {13},
  Year = {2005},
  Issn = {1318-1882}
}

Semantično strukturiranje, ki ga dosežemo z uporabo ontologij, se razlikuje od površinskega oblikovanja informacij, ki nam jih nudijo relacijske in XML podatkovne baze, saj mora biti pri podatkovnih bazah večina semantične vsebine zajete v uporabniških programih. Ontologije predstavljajo objektivno specifikacijo informacij za določeno domeno, kjer s predstavitvijo konceptov in medsebojnih relacij prikažemo znanje. Ta specifikacija je prvi korak pri gradnji naprednejših informacijskih sistemov, ki temeljijo na souporabi obstoječega znanja. V prispevku prikažemo stopnjo inteligence, ki so jo podatki skozi čas pridobivali, se ustavimo ter podrobneje opišemo najvišjo raven, ontologije in avtomatsko sklepanje. Predstavljen je opredelitev ontologij s filozofskega stališča in uporaba na področju računalništva in informatike, kjer omenimo jezike za opis in predstavitev ontologij.

Conference 5x

Dejan Lavbič, Rok Rupnik, Aljaž Zrnec, Damjan Vavpotič and Marjan Krisper. 2005. Agentno usmerjen razvoj informacijskih sistemov in večagentni sistemi, Informatika kot temelj povezovanja - zbornik prispevkov 12. konference Dnevi slovenske informatika (DSI 2005), Portorož, Slovenia.
PDF full text COBISS

@Inproceedings{lavbic_agentno_2005,
  Address = {Portorož, Slovenia},
  Author = {Lavbič, Dejan and Rupnik, Rok and Zrnec, Aljaž and Vavpotič, Damjan and Krisper, Marjan},
  Booktitle = {Informatika kot temelj povezovanja - zbornik prispevkov 12. konference {Dnevi} slovenske informatika ({DSI} 2005)},
  Note = {2005/DSI-1},
  Pages = {371--376},
  Title = {Agentno usmerjen razvoj informacijskih sistemov in večagentni sistemi},
  Year = {2005}
}

Dejan Lavbič. 2005. Avtonomna programska oprema in ponovna uporaba obstoječih informacij, Informatika kot temelj povezovanja - zbornik prispevkov 12. konference Dnevi slovenske informatika (DSI 2005), Portorož, Slovenia.
PDF full text COBISS

@Inproceedings{lavbic_avtonomna_2005,
  Address = {Portorož, Slovenia},
  Author = {Lavbič, Dejan},
  Booktitle = {Informatika kot temelj povezovanja - zbornik prispevkov 12. konference {Dnevi} slovenske informatika ({DSI} 2005)},
  Note = {2005/DSI-2},
  Pages = {755--760},
  Title = {Avtonomna programska oprema in ponovna uporaba obstoječih informacij},
  Year = {2005}
}

Damjan Vavpotič, Marko Bajec, Marjan Krisper, Aljaž Zrnec and Dejan Lavbič. 2005. Merjenje in izboljševanje tehnične učinkovitosti in socialne sprejetosti metodologij razvoja IS, Informatika kot temelj povezovanja - zbornik prispevkov 12. konference Dnevi slovenske informatika (DSI 2005), Portorož, Slovenia.
COBISS

@Inproceedings{vavpotic_merjenje_2005,
  Address = {Portorož, Slovenia},
  Author = {Vavpotič, Damjan and Bajec, Marko and Krisper, Marjan and Zrnec, Aljaž and Lavbič, Dejan},
  Booktitle = {Informatika kot temelj povezovanja - zbornik prispevkov 12. konference {Dnevi} slovenske informatika ({DSI} 2005)},
  Pages = {309--315},
  Title = {Merjenje in izboljševanje tehnične učinkovitosti in socialne sprejetosti metodologij razvoja {IS},
  Year = {2005}
}

Dejan Lavbič, Rok Rupnik and Marjan Krisper. 2005. Poslovna pravila v večagentnih sistemih, Zbornik 8. mednarodne multikonference Informacijska družba (IS 2005), Ljubljana, Slovenia.
PDF full text COBISS

@Inproceedings{lavbic_poslovna_2005,
  Address = {Ljubljana, Slovenia},
  Author = {Lavbič, Dejan and Rupnik, Rok and Krisper, Marjan},
  Booktitle = {Zbornik 8. mednarodne multikonference {Informacijska} družba ({IS} 2005)},
  Note = {2005/IS},
  Pages = {374--377},
  Title = {Poslovna pravila v večagentnih sistemih},
  Year = {2005}
}

Aljaž Zrnec, Marko Bajec, Marjan Krisper, Damjan Vavpotič, Dejan Lavbič and Marjan Krisper. 2005. Prilagajanje procesa konkretnim potrebam projekta, Informatika kot temelj povezovanja - zbornik prispevkov 12. konference Dnevi slovenske informatika (DSI 2005), Portorož, Slovenia.
COBISS

@Inproceedings{zrnec_prilagajanje_2005,
  Address = {Portorož, Slovenia},
  Author = {Zrnec, Aljaž and Bajec, Marko and Krisper, Marjan and Vavpotič, Damjan and Lavbič, Dejan and Krisper, Marjan},
  Booktitle = {Informatika kot temelj povezovanja - zbornik prispevkov 12. konference {Dnevi} slovenske informatika ({DSI} 2005)},
  Pages = {316--321},
  Title = {Prilagajanje procesa konkretnim potrebam projekta},
  Year = {2005}
}

2004 1x

Conference 1x

Dejan Lavbič. 2004. Povezava rezultatov iskanja spletnega inteligentnega agenta s podatki pomembnimi za poslovne odločitve, Management in informatika - zbornik prispevkov 11. konference Dnevi slovenske informatike (DSI 2004), Portorož, Slovenia.
PDF full text COBISS

@Inproceedings{lavbic_povezava_2004,
  Address = {Portorož, Slovenia},
  Author = {Lavbič, Dejan},
  Booktitle = {Management in informatika - zbornik prispevkov 11. konference {Dnevi} slovenske informatike ({DSI} 2004)},
  Note = {2004/DSI},
  Pages = {670--675},
  Title = {Povezava rezultatov iskanja spletnega inteligentnega agenta s podatki pomembnimi za poslovne odločitve},
  Year = {2004}
}