Browsing by Author "Stassopoulou, Athena"
Now showing items 1-15 of 15
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Article
Characterizing crawler behavior from web server access logs
Dikaiakos, Marios D.; Stassopoulou, Athena; Papageorgiou, Loizos (2003)In this paper, we present a study of crawler behavior based on Web-server access logs. To this end, we use logs from five different academic sites in three countries. Based on these logs, we analyze the activity of different ...
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Conference Object
Combining Naive Bayes Classifiers with Temporal Association Rules for Coronary Heart Disease Diagnosis
Orphanou, Kalia; Dagliati, A.; Sacchi, L.; Stassopoulou, Athena; Keravnou-Papailiou, Elpida T.; Bellazzi, R. (2016)
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Article
Content-selection strategies for the periodic prefetching of WWW resources via satellite
Dikaiakos, Marios D.; Stassopoulou, Athena (2001)In this paper we study satellite-caching, that is, the employment of satellite multicasting for the dissemination of prefetched content to WWW caches. This approach is currently being deployed by major satellite operators ...
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Conference Object
Crawler detection: A Bayesian approach
Stassopoulou, Athena; Dikaiakos, Marios D. (2006)In this paper, we introduce a probabilistic modeling approach for addressing the problem of Web robot detection from Web-server access logs. More specifically, we construct a Bayesian network that classifies automatically ...
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Article
DBN-extended: A Dynamic Bayesian network model extended with temporal abstractions for coronary heart disease prognosis
Orphanou, Kalia; Stassopoulou, Athena; Keravnou-Papailiou, Elpida T. (2015)Dynamic Bayesian networks (DBNs) are temporal probabilistic graphical models that model temporal events and their causal and temporal dependencies. Temporal abstraction (TA) is a knowledge-based process which abstracts raw ...
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Article
DBN-extended: A dynamic Bayesian network model extended with temporal abstractions for coronary heart disease prognosis
Orphanou, Kalia; Stassopoulou, Athena; Keravnou-Papailiou, Elpida T. (2016)
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Conference Object Open Access
Digipoe: an open standard and reference implementation for digital portfolios
Georgiou, Eleni; Stassopoulou, Athena; Dikaiakos, Marios (Department of Educational Sciences, University of Cyprus, 2003)In this paper we present the design and implementation of a software system aiming at helping educators in the process of appraisal for self-improvement and self-evaluation. The system is a "Digital Portfolio Environment" ...
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Article
Integration of Temporal abstraction and Dynamic Bayesian Networks for Coronary Heart Diagnosis
Orphanou, Kalia; Stassopoulou, Athena; Keravnou-Papailiou, Elpida T. (2014)
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Article
An investigation of web crawler behavior: Characterization and metrics
Dikaiakos, Marios D.; Stassopoulou, Athena; Papageorgiou, Loizos (2005)In this paper, we present a characterization study of search-engine crawlers. For the purposes of our work, we use Web-server access logs from five academic sites in three different countries. Based on these logs, we analyze ...
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Article
On the properties of spam-advertised URL addresses
Georgiou, E.; Dikaiakos, Marios D.; Stassopoulou, Athena (2008)The main purpose of most spam e-mail messages distributed on Internet today is to entice recipients into visiting World Wide Web pages that are advertised through spam. In essence, e-mail spamming is a campaign that ...
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Article
A probabilistic reasoning approach for discovering web crawler sessions
Stassopoulou, Athena; Dikaiakos, Marios D. (2007)In this paper we introduce a probabilistic-reasoning approach to detect Web robots (crawlers) from human visitors of Web sites. Our approach employs a Naive Bayes network to classify the HTTP sessions of a Web-server access ...
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Conference Object
Real-time web crawler detection
Balla, A.; Stassopoulou, Athena; Dikaiakos, Marios D. (2011)In this paper we present a methodology for detecting web crawlers in real time. We use decision trees to classify requests in real time, as originating from a crawler or human, while their session is ongoing. For this ...
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Article
Risk assessment for primary coronary heart disease event using dynamic bayesian networks
Orphanou, Kalia; Stassopoulou, Athena; Keravnou-Papailiou, Elpida T. (2015)
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Article
Temporal abstraction and temporal Bayesian networks in clinical domains: a survey
Orphanou, Kalia; Stassopoulou, Athena; Keravnou-Papailiou, Elpida T. (2014)Objectives: Temporal abstraction (TA) of clinical data aims to abstract and interpret clinical data into meaningful higher-level interval concepts. Abstracted concepts are used for diagnostic, prediction and therapy planning ...
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Article
Web robot detection: A probabilistic reasoning approach
Stassopoulou, Athena; Dikaiakos, Marios D. (2009)In this paper, we introduce a probabilistic modeling approach for addressing the problem of Web robot detection from Web-server access logs. More specifically, we construct a Bayesian network that classifies automatically ...