Papers by Mirta Baranovic
Procesni model Sveučilišta u Zagrebu
Data warehouse is a copy of transaction data specifically structured for query and analysis [1]. ... more Data warehouse is a copy of transaction data specifically structured for query and analysis [1]. Within data warehouse, data is usually stored in a dimensional model. On-Line Analytical Processing (OLAP) is an approach to analysis and reporting that enables a user to easily and selectively extract and view data from different points of view based on a multidimensional data structure called a cube [2]. There are numerous data warehousing platforms available on the market. Exhaustive data warehousing platform comprises of data warehouse server, OLAP server and some data mining functionality. There are no present standards to support interoperability between different OLAP systems. In this article, two major initiatives towards standardization are examined: XMLA and JOLAP. Web service is a piece of business logic, located somewhere on the Internet, that is accessible through standard-based Internet protocols such as HTTP or SMTP [3]. Web services are neither language nor platformspecif...
Proceedings of the ITI 2010, 32nd International Conference on Information Technology Interfaces, 2010
With increasing student mobility and boom of the international student exchange programmes, a nee... more With increasing student mobility and boom of the international student exchange programmes, a need arises for unifying and presenting information about academic study programmes on the Web. Publishing study programmes using semantic web technologies enables students to easily search and select study topic of their interest. In this paper, we discuss the way to transform data from production-grade information system's relational database to semantic data. The process of transforming starts with building ontology for describing study programmes. Data from relational database is mapped to the semantic model. Finally, we present the study programmes from semantic model which are used by the web application. Project presented in this paper took first step in introducing ISVU to semantic web and demonstrated possibility to integrate data about academic programmes.
Proceedings of the 28th International Convention MIPRO (BIS&DE&ISS), MIPRO 2005, May 30-June 03, 2005, Opatija, Croatia
IEEE Access
Automated Programming Assessment Systems (APAS) are used for overcoming problems associated with ... more Automated Programming Assessment Systems (APAS) are used for overcoming problems associated with manually managed programming assignments, such as objective and efficient assessing in large classes and providing timely and helpful feedback. In this paper we survey the literature and software in this field and identify the set of necessary features that make APAS comprehensive-such that it can support all key stages in the assessment process. Put differently, comprehensive APAS is generic enough to meet the demands of "any" computer science course. Despite the vast number of publications, the choice of software turns out to be very limited. We contribute by developing Edgar, a comprehensive open-source APAS which, to the best of our knowledge, exceeds any other similar free and/or open-source tool. Edgar is the result of three years of development and usage in, for the time being, eight courses dealing with various programming languages and paradigms (C, Java, SQL, etc.). Edgar supports various text-based programming languages, multi-correct multiple-choice questions, provides rich exam logging and monitoring infrastructure to prevent potential fraudulent behaviour, and subsequent data analysis and visualization of students' scores, exams, question quality, etc. It can be deployed on all major operating systems and is written in a modular fashion so that it can be adjusted and scaled to a custom fit. We comment on the architecture and present data from real-world use-cases to support these claims. Edgar is in active use today (1000+ students per semester) and it is being constantly developed with new features.
Business process management systems selection guidelines: Theory and practice
2016 39th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO), 2016
Nowadays many business process management systems (BPMSs) are available on the market and it is q... more Nowadays many business process management systems (BPMSs) are available on the market and it is quite difficult to select the appropriate one. This paper presents a set of criteria and proposes guidelines for BPMS selection. The proposal has been developed on the basis of literature overview and the feedback from practical experience in BPM projects. The results of this research are valuable for both academic and business community.
ISVU - Higher Education Information System
ISVU je razvojni projekt Ministarstva znanosti, obrazovanja i sporta pokrenut krajem 2000. godine... more ISVU je razvojni projekt Ministarstva znanosti, obrazovanja i sporta pokrenut krajem 2000. godine u sklopu programa informatizacije visokih ucilista u Republici Hrvatskoj.
Proceedings of the 7th Wseas International Conference on Software Engineering Parallel and Distributed Systems, 2008
In order for peer-to-peer (P2P) content sharing network to be scalable, it is imperative to effic... more In order for peer-to-peer (P2P) content sharing network to be scalable, it is imperative to efficiently route queries through the network. Semantic based search should, with as little messages (traffic) as possible, return just those relevant documents stored throughout the network thus achieving precision and recall values comparable to those of correspondent centralized system. In this article we propose protocols for self-organizing P2P network that arranges links between peers according to peer's content. In proposed network peers organize themselves into "semantic communities" but without losing links to other semantic communities. Proposed network has no prior knowledge of the semantics of documents that are to be stored in the system.
Proceedings of the 11th International Conference on Telecommunications and Informatics Proceedings of the 11th International Conference on Signal Processing, Apr 2, 2012
In this paper we discuss the procedure for horizontal fragmentation of data warehouse tables. Thi... more In this paper we discuss the procedure for horizontal fragmentation of data warehouse tables. This procedure is suitable when there are multiple independent organizational units that are producing data of the same structure that is eventually loaded into the consolidated fact table. In such cases, it is important for one organizational unit's errors not to influence the others. We show that horizontal fragmentation improves data warehouse's data quality, namely, completeness and timeliness data quality dimensions. The proposed procedure relies on metadata and is generic and applicable to any data warehouse.
Proceedings of the 9th Wseas International Conference on Data Networks Communications Computers, Nov 3, 2010
At the moment, the field of Semantic Web is lacking methodologies for development of Semantic Web... more At the moment, the field of Semantic Web is lacking methodologies for development of Semantic Web solutions. We argue that existing methodologies are no longer relevant because of the constant technological changes in the field of Semantic Web as well as in the Web development. We also argue that providing unique development methodology for all Semantic Web applications is not satisfactorily and that specialization of methodologies is needed. To establish foundation for such methodologies we conducted an analysis of Semantic Web solutions resulting in a categorization of Semantic Web applications. In this paper we present our categorization scheme and provide precise definitions for each of the identified categories.
Proceedings of the 28th International Convention MIPRO (BIS&DE&ISS), MIPRO 2005, May 30June 03, 2005, Opatija, Croatia
User oriented Quality of Service (QoS) of On-Line Transaction Processing (OLTP) systems (or Data ... more User oriented Quality of Service (QoS) of On-Line Transaction Processing (OLTP) systems (or Data Warehouse (DW)) is determined with a response time, availability, consistency and currency. In this paper we consider the influence of the system load and the system throughput on the response time, as well as a possibility of the accurate response time prediction - whereby that mechanism may be a foundation for (automatized) decision-making for a query (or DB procedure) scheduling. The possible application of proposed method can be the estimation of the optimal moment for the data transfer from OLTP system into DW or the appropriate moment for the complex query execution.
The Multi-Meta Model Aimed for Schema Reuse in Conceptual Database Design
In this article a database model, called multi-meta model, aimed for schema reuse in conceptual d... more In this article a database model, called multi-meta model, aimed for schema reuse in conceptual database design is described. The multi-meta model is based on the entity-relationship model. The corresponding multi-meta database contains the description of existing database models. In the description of models contained in the multi-meta base, the redundancy has been maximally reduced without loss of existing knowledge. In this way, any ambiguity regarding the model description has been eliminated. The restructuring of knowledge about models is simplified, while the model consistencies are preserved. The necessary conditions are defined that have to be satisfied by each database model. If these conditions are not met, the described procedures for the model restructuring have to be applied.
Oceanus
Proceedings of the Third ACM SIGSPATIAL International Workshop on GeoStreaming - IWGS '12, 2012
Data warehouse as a part of the higher education information system in Croatia
IEEE Transactions on Image Processing, 2003
ABSTRACT Although the idea of a decision support system resourceful in querying and analysis can ... more ABSTRACT Although the idea of a decision support system resourceful in querying and analysis can be traced back to the 1960s, it was not until the late 1990s that data warehousing was universally recognized and adopted. We address issues related to modelling and implementing a data warehouse for the higher education information system in Croatia. The purpose of the project is to provide a data querying service that will improve the understanding, planning and operational work of institutions of higher education in Croatia in order to facilitate and improve educational activities.
OCEANUS: a spatio-temporal data stream system prototype
Recent advances in wireless communication, miniaturization of spatially enabled devices and globa... more Recent advances in wireless communication, miniaturization of spatially enabled devices and global navigation satellite systems (GNSS) services have resulted in a large number of novel application domains. Applications in these novel domains (moving objects tracking, sensor networks, fleet management, real-time intelligent transportation systems, etc.) process huge volume of continuous streaming data, i.e. data that is produced incrementally over time, rather than being available in full before processing. Data stream management systems (DSMS) have been developed to manage continuous data streams. Usually based on relational paradigm, they have rudimentary support for spatial data. Recent research efforts in data stream management systems focus mainly on processing continuous queries over traditional data streams, and only a few papers addressed spatio-temporal continuous queries. In this paper we present OCEANUS, an ongoing effort to extend TelegraphCQ DSMS with spatial support pro...
The Tanagra project - a simple MDBS API
A multidatabase system (MDBS) is a software package that allows user transactions to invoke retri... more A multidatabase system (MDBS) is a software package that allows user transactions to invoke retrieval and update instructions against data located in autonomous heterogeneous hardware and software environments. Here, the Tanagra Project is presented, a large part of which is a simple MDBS API. This API is introduced, and the data model it uses is described. The layers of the API and the tasks and capabilities of each layer are defined. Ways of handling standard data operations are shown. Possible extensions of the API are discussed, as well as its limitations and shortcomings
28th International Conference on Information Technology Interfaces, 2006., 2006
Until very recently, all websites have been built using a syntactic model. Now new semantic Web-b... more Until very recently, all websites have been built using a syntactic model. Now new semantic Web-based technologies are deployed that enable true interoperability standards. This paper describes why we should consider possibilities of migrating existing applications into Semantic Web, and presents possible steps that could be taken in this challenging task.
IEEE Transactions on Image Processing, 2003
During the migration of an application to a new system, it is usually desirable to start using ne... more During the migration of an application to a new system, it is usually desirable to start using new tools while keeping existing models. However, challenges brought by new technologies often lead to modifications in architecture of the existing system. Two similar applications with different architecture not sharing the same code base present a possible point of improvement. Development of a new multi-tier application based on open standards was an attempt to solve problems brought by old architecture. Special attention was given to implementation of specific feature of existing applications. Quality solution was achieved using stable platform and design patterns.
Data Types and Operations for Spatio-temporal Data Streams
2011 IEEE 12th International Conference on Mobile Data Management, 2011
Abstract While the field of spatio-temporal databases, moving objects databases and the field of ... more Abstract While the field of spatio-temporal databases, moving objects databases and the field of data stream management systems have separately been rather extensively researched in the last decade, a combined field of spatio-temporal data stream ...
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Papers by Mirta Baranovic