1,721,188 research outputs found
Ontology construction from online ontologies
Full text linkOne of the main hurdles towards a wide endorsement of ontologies is the high cost of constructing them. Reuse of existing ontologies offers a much cheaper alternative than building new ones from scratch, yet tools to support such reuse are still in their infancy. However, more ontologies are becoming available on the web, and online libraries for storing and indexing ontologies are increasing in number and demand. Search engines have also started to appear, to facilitate search and retrieval of online ontologies. This paper presents a fresh view on constructing ontologies automatically, by identifying, ranking, and merging fragments of online ontologies
TGVizTab: An ontology visualisation extension for Protégé
Full text linkOntologies are gaining a lot of interest and many are being developed to provide a variety of knowledge services. There is an increasing need for tools to graphically and in-teractively visualise such modelling structures to enhance their clarification, verification and analysis. Protégé 2000 is one of the most popular ontology modelling tools currently available. This paper introduces TGVizTab; a new Protégé plugin based on TouchGraph technology to graphically visualise Protégé?s ontologies
AKTing for the Consumer
No full textKnowledge management is all about delivering data to the right person at the right time and in the right format. Yet there are massive amounts of very valuable data stored in inaccessible databases, and written in machine unreadable formats. The applications below attempt to unlock the potential of some of this data, and serve it back to the consumer. Funded by the Office of Public Sector Information (OPSI) to demonstrate how Semantic Web technology can be used by government to unlock the potential of public sector information
Data driven ontology evaluation
Full text linkThe evaluation of ontologies is vital for the growth of the Semantic Web. We consider a number of problems in evaluating a knowledge artifact like an ontology. We propose in this paper that one approach to ontology evaluation should be corpus or data driven. A corpus is the most accessible form of knowledge and its use allows a measure to be derived of the 'fit' between an ontology and a domain of knowledge. We consider a number of methods for measuring this 'fit' and propose a measure to evaluate structural fit, and a probabilistic approach to identifying the best ontology
Content-based ontology ranking
Full text linkTechniques to rank ontologies are crucial to aid and encourage the re-use of publicly available ontologies. This paper presents a system that obtains a list of ontologies from a search engine that contain the terms provided by a knowledge engineer and ranks them. The ranking of these ontologies will be done according to how many of the concept labels in those ontologies match a set of terms extracted from a corpus of documents related to the domain of knowledge identified by the knowledge engineer's original search terms
Multivariant Information Management and Exploitation - Scenario Specification
No full textThis report provides a piloting scenario for MIMEX development which involves UK military operations in the Helmand province, Afghanistan. The scenario aims to highlight some of the challenges and opportunities for information exploitation in support of stabilising efforts undertaken in a complex environment where there is a blur borderline separating enemy forces and civil elements. The scenario describes the situation in Helmand and UK military tasks planned to be carried out in the province for the following 6 months. Aiming at providing sustainable security for the region, the tasks range from ensuring the safety for the local populations to suppressing insurgent activities. All these are information intensive tasks and draws attention to the challenges with respect to effective information acquisition, management and exploitation. Against this scenario, the report analyses the information requirements for the scenario tasks, which encompass both military and civil information. Based on these, it provides a taxonomy of the required information to serve as the departure point for later ontology development work and identifies relevant information resources currently available in the public domain. These resources are potential information sources for MIMEX’s later information acquisition work. In addition to the above, the report also outlines a set of capabilities anticipated to be implemented in support of the following areas in the context of the scenario: knowledge base maintenance, knowledge monitoring (for situation awareness), situation assessment and analysis, and operational planning. These capabilities are presented as a vision of the technologies that MIMEX will develop and to showcase a wide range of benefits that advance knowledge management and processing can bring to military users. Finally, the report identifies and reviews a number of existing semantic technologies that are relevant to the development of MIMEX
Ontology Change Management in Protégé
No full textOntology schemas tend to change and evolve over time to meet new requirements. This change may invalidate dependent applications if there is no dynamic adaptation to the changes made to underlying ontologies. Protégé, as a popular ontology development tool, should meet the challenges addressed by the evolving ontology. In this paper, we will briefly analyse the current ontology-change management in Protégé, and propose some extensions to facilitate change traceability by external application and services
Change Management: The Core Task of Ontology Versioning and Evolution
No full textChange management as a key issue in ontology versioning and evolution is still not fully addressed, which to some extent forms a barrier against the smooth process of ontology evolution. The key issue in the support of evolving ontologies is to distinguish and recognize the changes during the process of ontology evolution. Most of the current popular work on ontology versioning do not keep a record of the changes in the ontology, thus preventing the user from tracking those changes back and forward, or to at least understand the rational behind those changes. We are proposing an approach to get the evidences of ontology changes, keep track of them, and manage them in an engineering fashion
ONTOCOPI: Methods and Tools for Identifying Communities of Practice
No full textThe paper describes ONTOCOPI, a tool for identifying communities of practice (COPs) by analysing ontologies of the relevant working domain. COP identification is currently a resource-heavy process largely based on interviews. ONTOCOPI attempts to uncover informal COP relations by spotting patterns in the formal relations represented in ontologies, traversing the ontology from instance to instance via selected relations. Experiments to determine particular COPs from an academic ontology are described, showing how the alteration of threshold and temporal settings, and the weights applied to the ontology?s relations affect the composition of the identified COP
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