Miroslav Bača

Publications

• Analysis of B-tree data structure and its usage in computer forensics

  Petra Koruga, Miroslav Bača

  Central European Conference on Information and Intelligent Systems, Varaždin, Croatia; 01/2010

  The idea behind this article is to give an overview of B-tree data structure and show the connection between B-tree indexing technique and computer forensics. B-tree is a fast data indexing method that organizes indexes into a multi-level set of nodes, where each node contains indexed data. This tec... [more] The idea behind this article is to give an overview of B-tree data structure and show the connection between B-tree indexing technique and computer forensics. B-tree is a fast data indexing method that organizes indexes into a multi-level set of nodes, where each node contains indexed data. This technique is most commonly used in databases and file systems where it is important to retrieve records stored in a file when data is to large to fit in main memory. In that case, B-trees are used to reduce the number of disk accesses.

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• Behavioral and physical biometric characteristics modeling used for ITS security improvement

  Bača Miroslav, SCHATTEN Markus, ŠEVA Jurica

  Transport Problems : an International Scientific Journal. 01/2009;

  Biometric technologies rely on specific biometric characteristics that are used for recognition. The particular characteristic for a given situation can be described through a serious of descriptive parameters including ease of collecting, permanence, measurably, acceptability, deceptiveness, univer... [more] Biometric technologies rely on specific biometric characteristics that are used for recognition. The particular characteristic for a given situation can be described through a serious of descriptive parameters including ease of collecting, permanence, measurably, acceptability, deceptiveness, universality, uniqueness, sample cost, system cost, database size, as well as environmental factors. By using our ontology-based framework for adequacy of biometric systems, we introduce a model for using biometric technologies in ITS. Such technologies increase security, safety and protection of ITS.

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• Towards a General Definition of Biometric Systems

  Schatten Markus, Baca Miroslav, Cubrilo Mirko

  International Journal of Computer Science Issues. 01/2009;

  A foundation for closing the gap between biometrics in the narrower and the broader perspective is presented trough a conceptualization of biometric systems in both perspectives. A clear distinction between verification, identification and classification systems is made as well as shown that there a... [more] A foundation for closing the gap between biometrics in the narrower and the broader perspective is presented trough a conceptualization of biometric systems in both perspectives. A clear distinction between verification, identification and classification systems is made as well as shown that there are additional classes of biometric systems. In the end a Unified Modeling Language model is developed showing the connections between the two perspectives.

• Evaluation of Open Source Office Suites for the use in Public Administration of the Republic of Croatia from a Security Perspective

  Marinela Ivanković, Markus Schatten, Miroslav Bača

  19th Central European Conference on Information and Intelligent Systems, Varaždin, Croatia; 09/2008

  In this paper we will present an evaluation of open source offi�ce suites for the use in public administration of the Republic of Croatia from a security oriented view. Security is an important factor in this evaluation since there is no guarantee from a software developer company that can provide t... [more] In this paper we will present an evaluation of open source offi�ce suites for the use in public administration of the Republic of Croatia from a security oriented view. Security is an important factor in this evaluation since there is no guarantee from a software developer company that can provide the necessary backdrop for a huge organization like the public administration. Since the government of Croatia issued a policy where the use of open source software is strongly encouraged and recommended there was no public evaluation of possible offi�ce suites. By basing our reasoning on different research conducted in the European Union and worldwide we propose a number of applications that would be appropriate for o�ffice use in public administration.

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• Fuzzy active rules in mutimodal biometric systems

  K. Rabuzin, M. Baca, M. Schatten

  Information Technology Interfaces, 2008. ITI 2008. 30th International Conference on; 07/2008

  This paper presents the idea how to use fuzzy active rules within biometric systems. We have already shown how the concept of complex events presented in the active database theory could be used in order to build a biometric system. We especially explored the paradigm of active rules and complex eve... [more] This paper presents the idea how to use fuzzy active rules within biometric systems. We have already shown how the concept of complex events presented in the active database theory could be used in order to build a biometric system. We especially explored the paradigm of active rules and complex events and experimental results were encouraging. Fuzzy logic is very good when dealing with imprecision and uncertainty and hence it is suitable to be used in biometric systems. We will discuss how to apply fuzzy active rules in order to deal with imprecise decision making in multimodal biometric systems.

• A taxonomy of biometric methods

  M. Schatten, M. Baca, K. Rabuzin

  Information Technology Interfaces, 2008. ITI 2008. 30th International Conference on; 07/2008

  In this paper we shall introduce a taxonomy of biometric methods continuing thereby our previous research on selected segments of biometrics. We show how our previously developed systematization and categorization of biometric methods, characteristics and models can be extended by building upon an o... [more] In this paper we shall introduce a taxonomy of biometric methods continuing thereby our previous research on selected segments of biometrics. We show how our previously developed systematization and categorization of biometric methods, characteristics and models can be extended by building upon an open ontology of biometrics. The developed taxonomy inherits its openness and extendibility as well as its consistency from the systematization, adding new insights at the same time. We add a new dimension, namely biometric samples, to our previous framework built upon biometric characteristics as well as the general biometric system developed by Wayman and extended in our research.

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• Modeling Biometrics Systems in UML

  Miroslav Bača, Markus Schatten, Bernardo Golenja

  18th International Conference Information and Intelligent Systems, Varaždin, Croatia; 09/2007

  Abstract. In this paper we present an object-relational database for biometric systems and results conducted during implementation. Using a systematization of biometric methods, models and characteristics we developed a UML (Unified Modeling Language) model and ODL (Object Definition Language) speci... [more] Abstract. In this paper we present an object-relational database for biometric systems and results conducted during implementation. Using a systematization of biometric methods, models and characteristics we developed a UML (Unified Modeling Language) model and ODL (Object Definition Language) specification of the database which can be used for unimodal as well as for multimodal biometric systems. For the implementation we used the object-oriented scripting language Python, and especially the ZODB (Zope Object Database) package for object-base management. In the end we summarize the advantages and disadvantages of such an approach, and give guidelines for future research of such a concept.

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• Using Biometric Characteristics to Increase ITS Security

  Bača Miroslav, Čubrilo Mirko, Rabuzuin Kornelije

  Traffic&Transportation Scientific Journal on Traffic and Transportation Research. 05/2007;

• The Concept of Complex Events as Suitable Means for Biometric System Implementation

  Kornelije Rabuzin, Miroslav Bača, Markus Schatten

  International Multi-Conference on Computing in the Global Information Technology, Gosier, Guadaloupe; 03/2007

  Generally speaking, a user (person) can be authorized in three different ways (or their combinations): one can use something that a user knows, something that a user possesses or by measuring some physical or psychological characteristics which are immanent and unique to each person i.e. biometric c... [more] Generally speaking, a user (person) can be authorized in three different ways (or their combinations): one can use something that a user knows, something that a user possesses or by measuring some physical or psychological characteristics which are immanent and unique to each person i.e. biometric characteristics. In this paper we are going to put accent on this third possibility. We are going to show how active databases could be used in order to implement multimodal biometric systems, and, due to some capabilities which they possess, reduce the time needed for authorization (identification). Especially, we will put accent on complex events and show how they can be used for identification (authorization) purposes.

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• TOWARDS AN OPEN BIOMETRIC ONTOLOGY

  Bača Miroslav, SCHATTEN Markus, Rabuzin Kornelije

  Journal of Information and Organizational Sciences. 01/2007;

  Over the last decade we faced a great number of publications in the field of biometrics. Many new biometric methods, techniques, models, metrics and characteristics were proposed. Due to this explosion of research, scientific and professional papers certain inconsistencies in terminology. What some ... [more] Over the last decade we faced a great number of publications in the field of biometrics. Many new biometric methods, techniques, models, metrics and characteristics were proposed. Due to this explosion of research, scientific and professional papers certain inconsistencies in terminology. What some authors call a biometric method, others call model, system or even characteristic. There wasn't enough effort in creating a unique systematization and categorization which would approach the stated issues and open new areas of research. We argue that it is possible to approach biometrics in a narrower and in a broader perspective. We observed biometrics in the narrower perspecive and created a unique framework for the systematization and categorization of biometric methods, models, characteristics and patterns based on a general biometric system. This systematization is a fundamental step forward towards the creation of an open biometrics ontology.

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• A Multimodal Biometric System Implemented within an Active Database Management System

  Rabuzin Kornelije, Bača Miroslav, Maleković Mirko

  Journal of Software. 01/2007;

  Active databases have been used in many different fields to accomplish many different tasks. One of the main problems today that still have not been solved is authorization. In some situations it is enough that user knows e.g. password, in other situations it is enough that user posses e.g. a smart ... [more] Active databases have been used in many different fields to accomplish many different tasks. One of the main problems today that still have not been solved is authorization. In some situations it is enough that user knows e.g. password, in other situations it is enough that user posses e.g. a smart card, but, there are also situations where user’s unique physical or psychological characteristics need to be measured. In this paper we are going to put accent on this third possibility. We will show how the concept of complex events presented in the active database theory could be used in order to build a multimodal biometric system. Especially, we will explore the paradigm of active rules and complex events, and apply them in order to implement a multimodal biometric system.

• Towards an open biometrics ontology

  Miroslav Bača, Markus Schatten, Kornelije Rabuzin

  Journal of Information and Organizational Sciences. 01/2007; 31:1-11.

  In the last decade we faced a great number of publications in the field of biometrics and a lot of new biometric methods, techniques, models, metrics and characteristics were proposed. Due to this explosion of research, scientific and professional papers certain inconsistencies in terminology emerge... [more] In the last decade we faced a great number of publications in the field of biometrics and a lot of new biometric methods, techniques, models, metrics and characteristics were proposed. Due to this explosion of research, scientific and professional papers certain inconsistencies in terminology emerged. What some authors call a biometric method, others call model, system or even characteristic. There wasn't enough effort in creating a unique systematization and categorization which would approach the stated issues and open new areas of research. We argue that it is possible to approach biometrics in a narrower and in a broader perspective. We observed biometrics in the narrower one and created a unique framework for the systematization and categorization of biometric methods, models, characteristics and patterns based on a general biometric system. This systematization is a fundamental step forward towards the creation of an open biometrics ontology.

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• Autopoietic Information Systems in Modern Organizations

  Miroslav Bača, Markus Schatten, Dinko Deranja

  Organizacija. 01/2007; 40:157-165.

  In this paper we argue for the possibilities of applying the concept of autopoiesis to modern organizations information systems. Modern organizations today in a rapidly changing, turbulent and complex environment are virtual, open, heterarchic and autopoietic. The main question in this paper we try ... [more] In this paper we argue for the possibilities of applying the concept of autopoiesis to modern organizations information systems. Modern organizations today in a rapidly changing, turbulent and complex environment are virtual, open, heterarchic and autopoietic. The main question in this paper we try to address is how to support such organizations with an adequate information system? We show that it is possible to develop autopoietic information systems which should be able to respond to the challanges of modern organizations.

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• Framework for systematization and categorization of biometrics methods

  Miroslav Bača, Markus Schatten, Kornelije Rabuzin

  17th International Conference Information and Intelligent Systems, Varaždin, Croatia; 09/2006

  During the last decade a great number of publications in the field of biometry has emerged. Due to this explosion of research, which has brought us scientific and professional papers, a lot of new biometric methods, techniques, models, metrics and characteristics were proposed. But there was not eno... [more] During the last decade a great number of publications in the field of biometry has emerged. Due to this explosion of research, which has brought us scientific and professional papers, a lot of new biometric methods, techniques, models, metrics and characteristics were proposed. But there was not enough effort in creating a unique systematization and categorization which would approach the stated issues and open new areas of research. We argue that it is possible to approach biometry in a narrow and in a broader sense. For the purpose of this paper we observed biometry in the narrow sense (research possibilities of person recognition based on physical and/or psychological characteristics) and created a unique framework for the systematization and categorization of biometric methods, models, characteristics and patterns based on a general biometric system.

• HOW TO CALCULATE INFORMATION VALUE FOR EFFECTIVE SECURITY RISK ASSESSMENT

  Sajko Mario, Rabuzin Kornelije, Bača Miroslav

  Journal of Information and Organizational Sciences. 01/2006;

  The actual problem of information security (infosec) risk assessment is determining the value of information property or asset. This is particularly manifested through the use of quantitative methodology in which it is necessary to state the information value in quantitative sizes. The aim of this p... [more] The actual problem of information security (infosec) risk assessment is determining the value of information property or asset. This is particularly manifested through the use of quantitative methodology in which it is necessary to state the information value in quantitative sizes. The aim of this paper is to describe the evaluation possibilities of business information values, and the criteria needed for determining importance of information. For this purpose, the dimensions of information values will be determined and the ways used to present the importance of information contents will be studied. There are two basic approaches that can be used in evaluation: qualitative and quantitative. Often they are combined to determine forms of information content. The proposed criterion is the three-dimension model, which combines the existing experiences (i.e. possible solutions for information value assessment) with our own criteria. An attempt for structuring information value in a business environment will be made as well.

• FINGERPRINTS PREPROCESSING USING WALSH FUNCTIONS

  Bača Miroslav, Rabuzin Kornelije

  Journal of Information and Organizational Sciences. 01/2006;

  Minutiae classification and fingerprint classification in fingerprint evaluating process are very important. Fingerprint image contains about 150 minutiae’s. When we compare two fingerprint images, we compare latent and non latent fingerprint and we try to find 12 minutiae’s placed on the same posit... [more] Minutiae classification and fingerprint classification in fingerprint evaluating process are very important. Fingerprint image contains about 150 minutiae’s. When we compare two fingerprint images, we compare latent and non latent fingerprint and we try to find 12 minutiae’s placed on the same position on latent and non latent fingerprint images. After fingerprint image pre-processing we can perform classification or we can try to find minutiae. In this paper we describe the process of minutiae classification for comparison purposes. For that purpose we use Walsh function and Walsh transforms. Paper describes minutiae classification which is relatively new in recognition systems and gives contribution for development of practical fingerprint recognition systems. Paper also gives contribution in the theoretical part due to the fact that Walsh functions were not implemented in fingerprint pre-processing systems so far. The new symbolic database model for fingerprint storage gives multifunctional foundations for future research.

• A SURVEY OF THE PROPERTIES OF AGENTS

  Rabuzin Kornelije, Maleković Mirko, Bača Miroslav

  Journal of Information and Organizational Sciences. 01/2006;

  In the past decade agent systems were considered to be as one of the major fields of study in Artificial Intelligence (AI) field. Many different definitions of agents were presented and several different approaches describing agency can be distinguished. While some authors have tried to define “what... [more] In the past decade agent systems were considered to be as one of the major fields of study in Artificial Intelligence (AI) field. Many different definitions of agents were presented and several different approaches describing agency can be distinguished. While some authors have tried to define “what” an agent really is, others have tried to identify agents by means of properties which they should possess. Most authors agree on these properties (at least basic set of properties) which are intrinsic to agents. Since agent's definitions are not consistent, we are going to give an overview and list the properties intrinsic to an agent. Many different adjectives were attached to the term agent as well and many different kinds of agents and different architectures emerged too. The aim of this paper it go give an overview of what was going on in the field while taking into consideration main streams and projects. We will also present some guidelines important when modelling agent systems and say something about security issues. Also, some existing problems which restrict the wider usage of agents will be mentioned too.

• Introduction in computer security (In Croatian)

  Miroslav Bača

  05/2004: pages 378;

  ISBN: 953-234-030-0