re-use and re-engineering of the knowledge. However, beside
consistency checking, current ontology engineering tools provide
only basic functionalities for analyzing ontologies. Since
ontologies can be considered as (labeled, directed) graphs, graph
analysis techniques are a suitable answer for this need. Graph
analysis has been performed by sociologists for over 60 years, and
resulted in the vivid research area of Social Network Analysis
(SNA). While social network structures in general currently receive
high attention in the Semantic Web community, there are only very
few SNA applications up to now, and virtually none for analyzing the
structure of ontologies.
We illustrate in this paper the benefits of applying SNA to
ontologies and the Semantic Web, and discuss which research topics
arise on the edge between the two areas. In particular, we discuss
how different notions of centrality describe the core content and
structure of an ontology. From the rather simple notion of degree
centrality over betweenness centrality to the more complex
eigenvector centrality based on Hermitian matrices, we illustrate
the insights these measures provide on two ontologies, which are
different in purpose, scope, and size. ER - TY - JOUR AU - Cimiano, Philipp AU - Hotho, Andreas AU - Staab, Steffen T1 - Learning Concept Hierarchies from Text Corpora using Formal Concept Analysis JO - Journal on Artificial Intelligence Research PY - 2005/ VL - 24 IS - SP - 305 EP - 339 UR - http://dblp.uni-trier.de/db/journals/jair/jair24.html#CimianoHS05 DO - KW - analysis KW - concept KW - fca KW - formal KW - hierarchies KW - hierarchy KW - learning KW - ontologies KW - ontology KW - text L1 - SN - N1 - N1 - AB - ER - TY - CONF AU - Stumme, Gerd A2 - Kalfoglou, Yannis A2 - Schorlemmer, W. Marco A2 - Sheth, Amit P. A2 - Staab, Steffen A2 - Uschold, Michael T1 - Ontology Merging with Formal Concept Analysis T2 - Semantic Interoperability and Integration PB - IBFI, Schloss Dagstuhl, Germany C1 - PY - 2005/ CY - VL - 04391 IS - SP - EP - UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2005/stumme2005ontology.pdf DO - KW - 2005 KW - itegpub KW - l3s KW - merging KW - myown KW - ontology L1 - SN - N1 - Publications of Gerd Stumme N1 - AB - ER - TY - CONF AU - Ganter, Bernhard AU - Stumme, Gerd A2 - de Moor, Aldo A2 - Lex, Wilfried A2 - Ganter, Bernhard T1 - Creation and Merging of Ontology Top-Levels T2 - Conceptual Structures for Knowledge Creation and Communication. PB - Springer C1 - Heidelberg PY - 2003/ CY - VL - 2746 IS - SP - 131 EP - 145 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2003/ganter2003creation.pdf DO - KW - 2003 KW - analysis KW - concept KW - fca KW - formal KW - merging KW - myown KW - ontologies KW - ontology L1 - SN - N1 - Publications of Gerd Stumme N1 - AB - We provide a new method for systematically structuring the top-down level of ontologies.
It is based on an interactive, top--down knowledge acquisition
process, which assures that the knowledge engineer
considers all possible cases while avoiding redundant acquisition.
The method is suited especially for creating/merging the top
part(s) of the ontologies, where high accuracy is required, and for supporting the merging of two (or more) ontologies on that level. ER - TY - CONF AU - Tane, Julien AU - Schmitz, Christoph AU - Stumme, Gerd AU - Staab, Steffen AU - Studer, R. A2 - David, Klaus A2 - Wegner, Lutz T1 - The Courseware Watchdog: an Ontology-based tool for finding and organizing
learning material T2 - Mobiles Lernen und Forschen - Beiträge der Fachtagung an der Universität PB - Kassel University Press C1 - PY - 2003/november CY - VL - IS - SP - 93 EP - 104 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2003/tane2003courseware.pdf DO - KW - 2003 KW - analysis KW - concept KW - courseware KW - crawling KW - e-learning KW - eLearning KW - edutella KW - fca KW - formal KW - myown KW - ontologies KW - ontology KW - p2p KW - padlr KW - watchdog L1 - SN - N1 - Publications of Gerd Stumme N1 - AB - Topics in education are changing with an ever faster pace. E-Learning
resources tend to be more and more decentralised. Users need increasingly to be able to
use the resources of the web. For this, they should have tools for finding and organizing
information in a decentral way. In this, paper, we show how an ontology-based tool
suite allows to make the most of the resources available on the web. ER - TY - RPRT AU - Fernandez-Lopez, Mariano AU - Gomez-Perez, Asun AU - Euzenat, Jerome AU - Gangemi, Aldo AU - Kalfoglou, Y. AU - Pisanelli, D. AU - Schorlemmer, M. AU - Steve, G. AU - Stojanovic, Ljilajana AU - Stumme, Gerd AU - Sure, York A2 - T1 - A survey on methodologies for developing, maintaining, integration, evaluation and
reengineering ontologies PB - Universidad Politecnia de Madrid AD - PY - 2002/ VL - IS - SP - EP - UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2002/OntoWeb_Del_1-4.pdf DO - KW - 2002 KW - engineering KW - integration KW - merging KW - myown KW - ontologies KW - ontology L1 - N1 - Publications of Gerd Stumme N1 - OntoWeb deliverable N1 - AB - ER - TY - JOUR AU - Staab, Steffen AU - Studer, Rudi AU - Schnurr, Hans-Peter AU - Sure, York T1 - Knowledge Processes and Ontologies JO - IEEE Intelligent Systems PY - 2001/ VL - 16 IS - 1 SP - 26 EP - 34 UR - http://portal.acm.org/citation.cfm?id=630607 DO - http://dx.doi.org/10.1109/5254.912382 KW - ontology L1 - SN - N1 - Knowledge Processes and Ontologies N1 - AB - Increases in product complexity, the move toward globalization, the emergence of virtual organizations, and the increase in focus on customer orientation all demand a more thorough and systematic approach to managing knowledge. Knowledge management is a major issue for human resource management, enterprise organization, and enterprise culture. But IT plays a major supporting role in managing knowledge.The authors present an approach for ontology-based knowledge management that includes a suite of tools as well as a methodology for developing ontology-based KM systems. Their approach builds on the distinction between knowledge process and knowledge metaprocess. They illustrate their methodology with CHAR, a knowledge management system for corporate history analysis.The challenges lie in analyzing KM processes and dynamically updating the KM solution. The authors' framework is designed to help leverage these evolving systems by providing a concise view of the problem. ER - TY - CONF AU - Stumme, G. AU - Maedche, A. A2 - Nebel, B. T1 - FCA-Merge: Bottom-Up Merging of Ontologies. T2 - Proc. 17th Intl. Conf. on Artificial Intelligence (IJCAI '01) PB - C1 - Seattle, WA, USA PY - 2001/ CY - VL - IS - SP - 225 EP - 230 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2001/IJCAI01.pdf DO - KW - 2001 KW - analysis KW - concept KW - fca KW - formal KW - merging KW - myown KW - ontologies KW - ontology KW - semantic KW - web L1 - SN - N1 - Publications of Gerd Stumme N1 - AB - ER - TY - GEN AU - of Standardization, International Organization A2 - T1 - ISO 704. Terminology Work - Principles and Methods JO - PB - C1 - PY - 2000/ VL - IS - SP - EP - UR - DO - KW - DIN KW - ISO KW - concept KW - concepts KW - din KW - iso KW - ontologies KW - ontology KW - terminology L1 - N1 - Bibliography N1 - AB - ER - TY - CONF AU - Stumme, G. AU - Studer, R. AU - Sure, Y. A2 - Bodendorf, F. A2 - Grauer, M. T1 - Towards an Order-Theoretical Foundation for Maintaining and Merging Ontologies T2 - Verbundtagung Wirtschaftsinformatik 2000 PB - Shaker C1 - Aachen PY - 2000/ CY - VL - IS - SP - 136 EP - 149 UR - http://www.kde.cs.uni-kassel.de/stumme/papers/2000/REFMOD00.pdf DO - KW - 2000 KW - analysis KW - concept KW - fca KW - formal KW - merging KW - myown KW - ontologies KW - ontology KW - semantic KW - web L1 - SN - N1 - Publications of Gerd Stumme N1 - AB - ER -