Mirta Baranovic

• PhD in Computer Science
• Professor (Full) at University of Zagreb

As the Data Lakes have gained a significant presence in the data world in the previous decade, several main approaches to building Data Lake architectures have been proposed. From the initial architecture towards the novel ones, omnipresent layers have been established, while at the same time new architecture layers are evolving. The evolution of t...

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...

Analysis of data stored in a graph enables the discovery of certain information that could be hard to see if the data were stored using some other model (e.g. relational). However, the vast majority of data in information systems today is stored in relational databases, which dominate the data management field over the last decades. In spite of the...

This paper analyzes the relationship between the system load/throughput and the query response time in a real Online transaction processing (OLTP) system environment. Although OLTP systems are characterized by short transactions, which normally entail high availability and consistent short response times, the need for operational reporting may jeop...

This paper is the result of a research project carried out by three teams of bachelor and master programme students. The research analyzes the possibility and usability of connecting different technologies. The project resulted in a system prototype based on a web application with a relational database, mobile application using a CouchDB database a...

A faculty with few thousand students, two studies and few hundred subjects faced the problem of how to devise the examination schedule. The aim of the examination schedule is to maximally disperse the examination terms as perceived by the students. Mixed­integer model turned out to be too complex and therefore genetic algorithm was applied. The ach...

The Croatian Scientific Bibliography -CROSBI is a bibliography web site that stores information about scientific papers published in Croatia in the last 15 years. At the present, CROSBI consists of over 400,000 records and is daily accessed and updated by a large number of researchers. As the appearance and purpose of database (and hence its struct...

A spatio-temporal database manages spatio-temporal objects and supports corresponding query languages. Today, the term moving objects databases is used as a synonym for spatio-temporal databases managing spatial objects with a continuously changing geospatial location and/or extent. Recent advances in wireless communication, miniaturization of spat...

Recent research efforts in data stream management systems (DSMS) focus mainly on processing continuous queries over traditional data streams, and only a few addressed spatio-temporal continuous queries. OCEANUS presents an effort to extend TelegraphCQ DSMS with spatial support providing a platform for spatio-temporal streaming applications. Data ty...

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, e...

We are proposing a multi-meta model that serves as a foundation for schema reuse in conceptual database design. Multi-meta model is based on entity-relationship model. According to the proposed model corresponding database, called multi-meta database is built. Multi-meta database contains descriptions of the existing database models and serves as a...

Managing moving objects in DSMS has recently been a focus of a relatively intense research. In this paper, we are concerned with data streams containing a location of a moving object at any time instant. Instead of using spatial and time instant data types separately, for representing spatio-temporal characteristics of data streams, we propose a un...

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 management systems has only recently become a focus of serious research effort. A spatio-temporal data stream ma...

In order to attain a certain degree of confidence in the quality of the data in the data warehouse it is necessary to perform a series of tests. There are many components (and aspects) of the data warehouse that can be tested, and in this paper we focus on the ETL procedures. Due to the complexity of ETL process, ETL procedure tests are usually cus...

Spatio-temporal database is a new type of database that manages spatio-temporal objects and supports corresponding query languages. If position and/or extent of an objects changes continuously, we talk about moving object database. A moving objects database supports a number of data types that could be termed moving. Standard and spatial operations...

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 Sem...

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 discus...

This paper gives an overview of web personalization approaches and techniques and explains possible ways of introducing the semantics into the web personalization process. Theoretical models of personalization are presented as base models for different semantic approaches to personalization and evaluated from aspect of usability. Existing semantic...

Currently, the World Wide Web is mostly composed of isolated and loosely connected "data islands". Connecting them together and retrieving only the information that is of interest to the user is the common Web usage process. Creating infrastructure that would support automation of that process by aggregating and integrating Web data in accordance t...

Spatio-temporal database is a new type of database that manages spatio-temporal objects and supports corresponding query languages. Term moving objects databases is today used as a synonym for spatio-temporal databases managing spatial objects with continuously changing location and/or extend. DSMS (Data Stream Management System) is an extension of...

Many data quality projects are integrated into data warehouse projects without enough time allocated for the data quality part, which leads to a need for a quicker data quality process implementation that can be easily adopted as the first stage of data warehouse implementation. We will see that many data quality rules can be implemented in a simil...

HEIS (Higher Education Information System) is a project funded by the Croatian Ministry of Science, Education and Sports started in the year 2001. HEIS is a comprehensive information system that provides support for education related processes taking place within a higher education institution. As a part of the project, a data warehouse was develop...

For a peer-to-peer(P2P) content sharing network holding large amount of data, an efficient semantic based search mechanism is a key requisite. Semantic based search should generate as little traffic (messages) possible while achieving precision and recall rates comparable to those of correspondent centralized system. In this paper protocols for sel...

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 c...

Until very recently, all Web sites 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 challeng...

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 r...

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...

Automated maintenance of data warehouse (DW) is particularly demanding task when DW is derived as an extension of existing transactional (OLTP) system - especially if corresponding assumptions haven't been incorporated in OLTP system design. Inability to implement modifications into existing design, necessity to maintain versions of DW through impl...

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 d...

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 poss...

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 purpos...

A faculty with a few thousand students, two fields of study and a few hundred subjects/specialisations faced the problem of how to devise their examination schedule. The aim of the examination schedule was to maximally disperse the examination terms as perceived by the students. A mixed-integer model turned out to be too complex, and therefore a ge...

The aim of the described model and procedures is to enable production planning by using multi-criteria linear programming in a manufacturing environment. It is assumed that linearity holds within acceptable tolerances and the problem of choice is present, i.e. the majority of products can be manufactured in a number of technically and financially d...

The foundation of the system lies in a technical database containing all the data relevant for the maintenance processes. ISOHEP helps the users to plan maintenance activities, to store and analyze the information about maintenance process. The outage management subsystem enables the minimization of the number and duration of outages. Embedded acti...