2009 First Asian Conference on Intelligent Information and Database Systems, 2009
ABSTRACT Motifs are small subgraphs showing statistically significant occurrence in given network... more ABSTRACT Motifs are small subgraphs showing statistically significant occurrence in given network. Motif analysis helps to insight into the local topology and functions of complex networks. The social position measure is interpreted as the importance of the node (user) within the network. We propose to fuse motif analysis with the social position assessment by colouring the nodes according to the measured position. As the distribution of discovered coloured motifs is utilized to mine the interconnection patterns between nodes, the results allow us to evaluate the influence of social position on the local topology of network connections. The experiment was carried out on the large social network derived from email communication.
ABSTRACT A new framework for recommendation of multimedia objects based on individual ontologies ... more ABSTRACT A new framework for recommendation of multimedia objects based on individual ontologies is presented in the paper. The recommendation process takes into account similarities calculated both between objects’ and users’ ontologies that respect the social and semantic features existing in the system. The system was developed for the use inthe Flickr multimedia sharing system.
2012 International Conference on Privacy, Security, Risk and Trust and 2012 International Confernece on Social Computing, 2012
This study investigates the data preparation process for predictive modelling of the evolution of... more This study investigates the data preparation process for predictive modelling of the evolution of complex networked systems, using an e–mail based social network as an example. In particular, we focus on the selection of optimal time window size for building a time series of network snapshots, which forms the input of chosen predictive models. We formulate this issue as a constrained multi–objective optimization problem, where the constraints are specific to a particular application and predictive algorithm used. The optimization process ...
A framework for recommendation of multimedia objects based on processing of individual ontologies... more A framework for recommendation of multimedia objects based on processing of individual ontologies is proposed in the chapter. The recommendation process takes into account similarities calculated both between objects’ and users’ ontologies, which reflect the social and semantic features existing in the system. The ontologies, which are close to the current context, provide a list of suggestions presented to the user. Each user in the system possesses its own Personal Agent that performs all necessary online tasks. Personal Agents co-operate each other and enrich lists of possible recommendations. The system was developed for the use inthe Flickr multimedia sharing system.
2012 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, 2012
We propose a predictive model of structural changes in elementary subgraphs of social network bas... more We propose a predictive model of structural changes in elementary subgraphs of social network based on Mixture of Markov Chains. The model is trained and verified on a dataset from a large corporate social network analyzed in short, one day-long time windows, and reveals distinctive patterns of evolution of connections on the level of local network topology. We argue that the network investigated in such short timescales is highly dynamic and therefore immune to classic methods of link prediction and structural analysis, and show ...
... In other words, more prominent people are those who received more nominations from members of... more ... In other words, more prominent people are those who received more nominations from members of the community [2]. The degree prestige DP(x) of member x can be described ... CambridgeUniversity Press, New York (1994) 19. ... Wernicke, S.: Efficient detection of network motifs. ...
ABSTRACT In this work we propose a framework for courses recommendation. We use a social network ... more ABSTRACT In this work we propose a framework for courses recommendation. We use a social network approach to discover relations between users and discover social networks reflecting the patterns according to which the services are used. The topological analysis of this network allows us to detect dense groups of users which tend to use educational. The method for educational services and the results of some experiments are given.
ABSTRACT A paper proposes a formal framework for communication patterns’ uncertainty assessment w... more ABSTRACT A paper proposes a formal framework for communication patterns’ uncertainty assessment within a distributed multiagent IDS architecture. The role of the detection of communication anomalies in IDS is discussed then it is shown how sequences of detectable patterns like fan-in, fan-out values for given network node and clustering coefficients can be used to detect network anomalies caused by security incidents (worm attack, virus spreading). It is defined how to use the proposed techniques in distributed IDS and backtrack the incidents.
Computational Intelligence in Decision and Control, 2008
ABSTRACT In this paper we briefly characterize the application of ontologies in multilevel inform... more ABSTRACT In this paper we briefly characterize the application of ontologies in multilevel information fusion. Then a scenario of multi-user environment with private ontologies is considered. We propose a social network-based ontology alignment scheme which aims to maintain knowledge consistency between communicating users thus ensuring effective collaboration and obtaining consistent results during information fusion tasks.
Computational Intelligence in Decision and Control, 2008
ABSTRACT In this paper we propose a Subjective Logic - based framework which allows composition a... more ABSTRACT In this paper we propose a Subjective Logic - based framework which allows composition and rating of semantically described web services. The framework is intended to be applied in so-called SOKU (Service-Oriented Knowledge Utility) environments and involves data fusion from two different sources (the descriptions of services and user ratings assigned to them).
ABSTRACT We propose an original approach which allows the characterization of network communicati... more ABSTRACT We propose an original approach which allows the characterization of network communication graphs with the network motifs. As an example we checked our approach by the use of network topology analysis methods applied to communication graphs. We have tested our approach on a simulated attacks inside a scale-free network and data gathered in real networks, showing that the motif distribution reflects the changes in communication pattern and may be used for the detection of ongoing attacks. We have also noticed that the communication graphs of the real networks show a distinctive motif profile.
2009 First Asian Conference on Intelligent Information and Database Systems, 2009
ABSTRACT Motifs are small subgraphs showing statistically significant occurrence in given network... more ABSTRACT Motifs are small subgraphs showing statistically significant occurrence in given network. Motif analysis helps to insight into the local topology and functions of complex networks. The social position measure is interpreted as the importance of the node (user) within the network. We propose to fuse motif analysis with the social position assessment by colouring the nodes according to the measured position. As the distribution of discovered coloured motifs is utilized to mine the interconnection patterns between nodes, the results allow us to evaluate the influence of social position on the local topology of network connections. The experiment was carried out on the large social network derived from email communication.
ABSTRACT A new framework for recommendation of multimedia objects based on individual ontologies ... more ABSTRACT A new framework for recommendation of multimedia objects based on individual ontologies is presented in the paper. The recommendation process takes into account similarities calculated both between objects’ and users’ ontologies that respect the social and semantic features existing in the system. The system was developed for the use inthe Flickr multimedia sharing system.
2012 International Conference on Privacy, Security, Risk and Trust and 2012 International Confernece on Social Computing, 2012
This study investigates the data preparation process for predictive modelling of the evolution of... more This study investigates the data preparation process for predictive modelling of the evolution of complex networked systems, using an e–mail based social network as an example. In particular, we focus on the selection of optimal time window size for building a time series of network snapshots, which forms the input of chosen predictive models. We formulate this issue as a constrained multi–objective optimization problem, where the constraints are specific to a particular application and predictive algorithm used. The optimization process ...
A framework for recommendation of multimedia objects based on processing of individual ontologies... more A framework for recommendation of multimedia objects based on processing of individual ontologies is proposed in the chapter. The recommendation process takes into account similarities calculated both between objects’ and users’ ontologies, which reflect the social and semantic features existing in the system. The ontologies, which are close to the current context, provide a list of suggestions presented to the user. Each user in the system possesses its own Personal Agent that performs all necessary online tasks. Personal Agents co-operate each other and enrich lists of possible recommendations. The system was developed for the use inthe Flickr multimedia sharing system.
2012 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, 2012
We propose a predictive model of structural changes in elementary subgraphs of social network bas... more We propose a predictive model of structural changes in elementary subgraphs of social network based on Mixture of Markov Chains. The model is trained and verified on a dataset from a large corporate social network analyzed in short, one day-long time windows, and reveals distinctive patterns of evolution of connections on the level of local network topology. We argue that the network investigated in such short timescales is highly dynamic and therefore immune to classic methods of link prediction and structural analysis, and show ...
... In other words, more prominent people are those who received more nominations from members of... more ... In other words, more prominent people are those who received more nominations from members of the community [2]. The degree prestige DP(x) of member x can be described ... CambridgeUniversity Press, New York (1994) 19. ... Wernicke, S.: Efficient detection of network motifs. ...
ABSTRACT In this work we propose a framework for courses recommendation. We use a social network ... more ABSTRACT In this work we propose a framework for courses recommendation. We use a social network approach to discover relations between users and discover social networks reflecting the patterns according to which the services are used. The topological analysis of this network allows us to detect dense groups of users which tend to use educational. The method for educational services and the results of some experiments are given.
ABSTRACT A paper proposes a formal framework for communication patterns’ uncertainty assessment w... more ABSTRACT A paper proposes a formal framework for communication patterns’ uncertainty assessment within a distributed multiagent IDS architecture. The role of the detection of communication anomalies in IDS is discussed then it is shown how sequences of detectable patterns like fan-in, fan-out values for given network node and clustering coefficients can be used to detect network anomalies caused by security incidents (worm attack, virus spreading). It is defined how to use the proposed techniques in distributed IDS and backtrack the incidents.
Computational Intelligence in Decision and Control, 2008
ABSTRACT In this paper we briefly characterize the application of ontologies in multilevel inform... more ABSTRACT In this paper we briefly characterize the application of ontologies in multilevel information fusion. Then a scenario of multi-user environment with private ontologies is considered. We propose a social network-based ontology alignment scheme which aims to maintain knowledge consistency between communicating users thus ensuring effective collaboration and obtaining consistent results during information fusion tasks.
Computational Intelligence in Decision and Control, 2008
ABSTRACT In this paper we propose a Subjective Logic - based framework which allows composition a... more ABSTRACT In this paper we propose a Subjective Logic - based framework which allows composition and rating of semantically described web services. The framework is intended to be applied in so-called SOKU (Service-Oriented Knowledge Utility) environments and involves data fusion from two different sources (the descriptions of services and user ratings assigned to them).
ABSTRACT We propose an original approach which allows the characterization of network communicati... more ABSTRACT We propose an original approach which allows the characterization of network communication graphs with the network motifs. As an example we checked our approach by the use of network topology analysis methods applied to communication graphs. We have tested our approach on a simulated attacks inside a scale-free network and data gathered in real networks, showing that the motif distribution reflects the changes in communication pattern and may be used for the detection of ongoing attacks. We have also noticed that the communication graphs of the real networks show a distinctive motif profile.
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Papers by Krzysztof Juszczyszyn