Mark Levene's The Nested Universal Relation Database Model PDF

By Mark Levene

ISBN-10: 3540554939

ISBN-13: 9783540554936

This monograph describes a style of knowledge modelling whose uncomplicated objective is to make databases more straightforward to exploit through supplying them with logical facts independence. to accomplish this, the nested UR (universal relation) version is outlined by means of extending the classical UR version to nested relatives. Nested kinfolk generalize flat relatives and make allowance hierarchically based items to be modelled at once, while the classical UR version permits the person to view the database as though it have been composed of a unmarried flat relation. the writer offers a entire formalisation of the nested relational version, which integrated null values into the version. sensible facts dependencies and the classical suggestion of lossless decomposition are prolonged to nested kin and a longer chase process is outlined to check the pride of the information dependencies. The nested UR version is outlined, and the classical UR version is proven to be a distinct case of the nested model.This signifies that an UR interface canbe applied through the use of the nested UR version, hence gaining the complete benefits of nested kin over flat relations.

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5 Experimental Results We conducted two experiments to evaluate the zero anaphora resolution and the indirect anaphora resolution. 1 Experimental Result of Zero Anaphora Resolution We ran an experiment on 100 newspaper articles in the “Relevance-tagged corpus” to evaluate the zero anaphora resolution. The antecedent location preference and the classifier are learned from 279 newspaper articles. Table 4 shows the experimental result. 2 Experimental Result of Indirect Anaphora Resolution We ran an experiment on 10 newspaper articles in the “Relevance-tagged corpus” to evaluate the indirect anaphora resolution.

Definition 1. By an ordered fuzzy number A we mean an ordered pair A = (f, g) of continuous functions f, g : [0, 1] → R. We call the corresponding elements: f – the up-part and g – the down-part of the fuzzy number A. The continuity of both parts implies their images are bounded intervals, say Fig. 1. a) Ordered fuzzy number, b) Ordered fuzzy number presented as fuzzy number in classical meaning, c) Simplified mark denotes the order of inverted functions Calculus with Fuzzy Numbers 25 U P and DOW N , respectively (Fig.

Fuzzy sets, Information and Control, 8 (1965) 338–353 27. : The concept of a linguistic variable and its application to approximate reasoning, Part I, Information Sciences, 8 (1975) 199–249 28. : The role of fuzzy logic in the management of uncertainty in expert systems, Fuzzy Sets and Systems, 11 (1983) 199–227. pl 3 Polish-Japanese Institute of Information Technology, ul. Koszykowa 86, 02-008 Warsaw, Poland Abstract. We present a new approach to the grid technology which is based on updateable views.

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The Nested Universal Relation Database Model by Mark Levene

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