Proceedings of the 12th International Conference on Telecommunications, Jun 26, 2013
Social networks based on ICT (Information and Communication Technology) are nowadays one of the m... more Social networks based on ICT (Information and Communication Technology) are nowadays one of the most popular services based on the Internet infrastructure. They are global phenomenon that greatly affects the modern way of life. Contrary to the widespread opinion, which assumes that social networks are interesting only for private users, these networks can produce added value in companies as well. The corporate social network is a system based on the web technologies that enables agile collaboration and information exchange within company. According to the method of making connections, social networks can be divided into two groups: implicit and explicit networks. While in explicit social networks a person herself defines another person to connect with, implicit networking is determined by a person's interests and by the level of communication and collaboration with other persons. This paper addresses the question of developing implicit corporate social networks. Based on the analysed communication performed through several communication channels (i.e. e-mail, file transfer, telephone calls and instant messaging) between the employees of a multinational company, we propose an algorithm for building the social network graph. Our algorithm calculates the level of connection between employees based on the level of communication between them. We verified the proposed algorithm on our prototype test application, the FER CSN Analysis.
Developing an Information System for Classified Electronic Documents
Abstract–The process of classifying information regarding the level of secrecy is performed in bu... more Abstract–The process of classifying information regarding the level of secrecy is performed in business organisations every day. As a result of that process, a number of classified information in electronic format is created. The information requires the fulfilment of strict ...
Volleyball Information System (VIS) is an information system that was built to be used as a suppo... more Volleyball Information System (VIS) is an information system that was built to be used as a support for the conduct of volleyball competitions, as well as the support for informing the public about volleyball. The system is composed of a central database where all the data is stored and of a set of web portals through which the authorized users
Proceedings of the 7th International Conference on Telecommunications, 2003. ConTEL 2003., 2003
Department of Telecommunications, Faculty of Electrical Engineering and Computing, University of ... more Department of Telecommunications, Faculty of Electrical Engineering and Computing, University of Zagreb works on the research project named "networked economy", supported by Croatian Ministry of Science and Technology. The project is also recognized by corporate domain and was made a part of an e-business initiative by the Agrokor group. The Agrokor's intention is to use the ebXML registry/repository layer as
Metadata-Driven SOA-Based Application for Facilitation of Real-Time Data Warehousing
Lecture Notes in Computer Science, 2009
Service-oriented architecture (SOA) has already been widely recognized as an effective paradigm f... more Service-oriented architecture (SOA) has already been widely recognized as an effective paradigm for achieving integration of diverse information systems. SOA-based applications can cross boundaries of platforms, operation systems and proprietary data standards, commonly through the usage of Web Services technology. On the other side, metadata is also commonly referred to as a potential integration tool given the fact that standardized metadata objects can provide useful information about specifics of unknown information systems with which one has interest in communicating with, using an approach commonly called "model-based integration". This paper presents the result of research regarding possible synergy between those two integration facilitators. This is accomplished with a vertical example of a metadata-driven SOA-based business process that provides ETL (Extraction, Transformation and Loading) and metadata services to a data warehousing system in need of a real-time ETL support.
A federated data warehouse is a logical integration of data warehouses applicable when physical i... more A federated data warehouse is a logical integration of data warehouses applicable when physical integration is impossible due to privacy policy or legal restrictions. In order to enable the translation of queries in a federated approach, schemas of the federated and the local warehouses must be matched. In this paper we present a procedure that enables the matching process for schema structures specific to the multidimensional model of data warehouses: facts, measures, dimensions, aggregation levels and dimensional attributes. Similarities between warehouse-specific structures are computed by using linguistic and structural comparison, where calculated values are used to create necessary mappings. We present restriction rules and recommendations for aggregation level matching, which builds the most complex part of the process. A software implementation of the entire process is provided in order to perform its verification, as well as to determine the proper selection metric for mapping different multidimensional structures.
2007 15th International Conference on Software, Telecommunications and Computer Networks, 2007
Data mining and data analysis in general demonstrate high dependency on data quality. Gathering t... more Data mining and data analysis in general demonstrate high dependency on data quality. Gathering the right data of high enough quality takes most of researcher's time and often demonstrates need for some additional data to be parsed. In order to eliminate or at least reduce required effort for this first phase of every analysis, authors of this paper present the idea of Integrated Data Repository and Intelligent Data Source. Concepts of those components are presented and approach to their development is suggested together with the high-level view of the system architecture. Finally, an experimental implementation is described.
An application for multidimensional analysis of the Web site traffic
2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099), 1998
Considers the use of online analytical processing (OLAP) tools to provide fast, interactive analy... more Considers the use of online analytical processing (OLAP) tools to provide fast, interactive analysis of Web-site traffic. For the purpose of analysing our own hierarchically organized Web site, the Directory of Croatian WWW Servers, an OLAP application (OLAWEB) has been developed. We describe data extraction from existing server access log files, the data transformation necessary to prepare data for multidimensional
2010 Fifth International Multi-conference on Computing in the Global Information Technology, 2010
Detailed inspection of transactional data can reveal various useful information, in which of spec... more Detailed inspection of transactional data can reveal various useful information, in which of special importance are relationships between transaction elements. Hierarchical clustering coupled with specific distance measures reveal those relationships from one angle. Additionally, association rules -a natural method of inspecting transactional data -is able to reveal relationships between each pair of transaction elements. With transactional data modulation and multiple usages of this method a tree-like structure can be created. This paper concerns the interpretation of resulting structures for each method as well as providing comparison between them. For each algorithm mathematical base is introduced along with an explanation of result interpretation. Performances of two methods are compared and examined on a real life data set.
Abstract. Automated construction of ontologies from text corpora, which saves both time and human... more Abstract. Automated construction of ontologies from text corpora, which saves both time and human effort, is a principal condition for realizing the idea of the Semantic Web. However, the recently proposed automated techniques are still limited in the scope of context that can ...
Proceedings of the 12th International Conference on Telecommunications, Jun 26, 2013
Social networks based on ICT (Information and Communication Technology) are nowadays one of the m... more Social networks based on ICT (Information and Communication Technology) are nowadays one of the most popular services based on the Internet infrastructure. They are global phenomenon that greatly affects the modern way of life. Contrary to the widespread opinion, which assumes that social networks are interesting only for private users, these networks can produce added value in companies as well. The corporate social network is a system based on the web technologies that enables agile collaboration and information exchange within company. According to the method of making connections, social networks can be divided into two groups: implicit and explicit networks. While in explicit social networks a person herself defines another person to connect with, implicit networking is determined by a person's interests and by the level of communication and collaboration with other persons. This paper addresses the question of developing implicit corporate social networks. Based on the analysed communication performed through several communication channels (i.e. e-mail, file transfer, telephone calls and instant messaging) between the employees of a multinational company, we propose an algorithm for building the social network graph. Our algorithm calculates the level of connection between employees based on the level of communication between them. We verified the proposed algorithm on our prototype test application, the FER CSN Analysis.
Developing an Information System for Classified Electronic Documents
Abstract–The process of classifying information regarding the level of secrecy is performed in bu... more Abstract–The process of classifying information regarding the level of secrecy is performed in business organisations every day. As a result of that process, a number of classified information in electronic format is created. The information requires the fulfilment of strict ...
Volleyball Information System (VIS) is an information system that was built to be used as a suppo... more Volleyball Information System (VIS) is an information system that was built to be used as a support for the conduct of volleyball competitions, as well as the support for informing the public about volleyball. The system is composed of a central database where all the data is stored and of a set of web portals through which the authorized users
Proceedings of the 7th International Conference on Telecommunications, 2003. ConTEL 2003., 2003
Department of Telecommunications, Faculty of Electrical Engineering and Computing, University of ... more Department of Telecommunications, Faculty of Electrical Engineering and Computing, University of Zagreb works on the research project named "networked economy", supported by Croatian Ministry of Science and Technology. The project is also recognized by corporate domain and was made a part of an e-business initiative by the Agrokor group. The Agrokor's intention is to use the ebXML registry/repository layer as
Metadata-Driven SOA-Based Application for Facilitation of Real-Time Data Warehousing
Lecture Notes in Computer Science, 2009
Service-oriented architecture (SOA) has already been widely recognized as an effective paradigm f... more Service-oriented architecture (SOA) has already been widely recognized as an effective paradigm for achieving integration of diverse information systems. SOA-based applications can cross boundaries of platforms, operation systems and proprietary data standards, commonly through the usage of Web Services technology. On the other side, metadata is also commonly referred to as a potential integration tool given the fact that standardized metadata objects can provide useful information about specifics of unknown information systems with which one has interest in communicating with, using an approach commonly called "model-based integration". This paper presents the result of research regarding possible synergy between those two integration facilitators. This is accomplished with a vertical example of a metadata-driven SOA-based business process that provides ETL (Extraction, Transformation and Loading) and metadata services to a data warehousing system in need of a real-time ETL support.
A federated data warehouse is a logical integration of data warehouses applicable when physical i... more A federated data warehouse is a logical integration of data warehouses applicable when physical integration is impossible due to privacy policy or legal restrictions. In order to enable the translation of queries in a federated approach, schemas of the federated and the local warehouses must be matched. In this paper we present a procedure that enables the matching process for schema structures specific to the multidimensional model of data warehouses: facts, measures, dimensions, aggregation levels and dimensional attributes. Similarities between warehouse-specific structures are computed by using linguistic and structural comparison, where calculated values are used to create necessary mappings. We present restriction rules and recommendations for aggregation level matching, which builds the most complex part of the process. A software implementation of the entire process is provided in order to perform its verification, as well as to determine the proper selection metric for mapping different multidimensional structures.
2007 15th International Conference on Software, Telecommunications and Computer Networks, 2007
Data mining and data analysis in general demonstrate high dependency on data quality. Gathering t... more Data mining and data analysis in general demonstrate high dependency on data quality. Gathering the right data of high enough quality takes most of researcher's time and often demonstrates need for some additional data to be parsed. In order to eliminate or at least reduce required effort for this first phase of every analysis, authors of this paper present the idea of Integrated Data Repository and Intelligent Data Source. Concepts of those components are presented and approach to their development is suggested together with the high-level view of the system architecture. Finally, an experimental implementation is described.
An application for multidimensional analysis of the Web site traffic
2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099), 1998
Considers the use of online analytical processing (OLAP) tools to provide fast, interactive analy... more Considers the use of online analytical processing (OLAP) tools to provide fast, interactive analysis of Web-site traffic. For the purpose of analysing our own hierarchically organized Web site, the Directory of Croatian WWW Servers, an OLAP application (OLAWEB) has been developed. We describe data extraction from existing server access log files, the data transformation necessary to prepare data for multidimensional
2010 Fifth International Multi-conference on Computing in the Global Information Technology, 2010
Detailed inspection of transactional data can reveal various useful information, in which of spec... more Detailed inspection of transactional data can reveal various useful information, in which of special importance are relationships between transaction elements. Hierarchical clustering coupled with specific distance measures reveal those relationships from one angle. Additionally, association rules -a natural method of inspecting transactional data -is able to reveal relationships between each pair of transaction elements. With transactional data modulation and multiple usages of this method a tree-like structure can be created. This paper concerns the interpretation of resulting structures for each method as well as providing comparison between them. For each algorithm mathematical base is introduced along with an explanation of result interpretation. Performances of two methods are compared and examined on a real life data set.
Abstract. Automated construction of ontologies from text corpora, which saves both time and human... more Abstract. Automated construction of ontologies from text corpora, which saves both time and human effort, is a principal condition for realizing the idea of the Semantic Web. However, the recently proposed automated techniques are still limited in the scope of context that can ...
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