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Management of dynamic knowledge (2005)

Haase, Peter ; Völker, Johanna ; Sure, York

Bingley : Emerald

Journal of knowledge management 9 (2005), S. 97-107

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ISSN: 1367-3270

Source: Emerald Fulltext Archive Database 1994-2005

Topics: Information Science and Librarianship

Notes: Purpose - This paper presents a framework for ontology evolution tailored to Digital Libraries, which makes use of two different sources for change detection and propagation, the usage of ontologies by users and the changes of available data. Design/methodology/approach - After presenting the logical architecture of the evolution framework, we first illustrate how to deal with usage-driven changes, that is changes derived from the actual usage of ontologies. Second, we describe the generation of data-driven ontology changes based on the constant flow of documents coming into digital libraries. Findings - The proposed framework for ontology ontology evolution, which is currently applied and evaluated in the case studies, significantly reduces the costs of ontology updates and improves the quality of the ontology with respect to the users' requirements. Practical implications - The management of dynamic knowledge is crucial for many knowledge management applications. Our approach for usage-driven and data-driven change discovery not only assures the consistency of ontologies modeling dynamic knowledge, but also reduces the burden of manual ontology engineering. Originality/value - This paper presents the first approach towards a common framework for ontology evolution based on usage-driven and data-driven change discovery.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1108/13673270510622483

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Climatic control of annual leaf area production in two New Zealand subalpine composite shrubs (1986)

Haase, Peter

Springer

Oecologia 68 (1986), S. 456-458

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ISSN: 1432-1939

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary The annual leaf area production of the subalpine composite shrubsOlearia ilicifolia andSenecio bennettii is related to the environmental temperatures experienced at the time of leaf primordia initiation in the previous growing season. The sensitive period occurs 3–9 weeks after bud break when the new resting bud is formed in the growing shoot apex. The initiation periods ofOlearia andSenecio do not coincide and, therefore, the annual variation of leaf area increment follows a different pattern in the two species. A minimum annual increment of 20 cm2 inOlearia and 40–45 cm2 inSenecio seems to represent a probable lower limit; lower temperatures are unlikely to be experienced during primordia formation as these would delay bud break.