Showing papers by "Katsumi Tanaka published in 1991"
01 Jan 1991
TL;DR: An approach and basic constructs to realize a fuzzy database processing capability on an Object-Oriented Database (OODB) system and briefly show the functionalities of the system by using an example movie database.
Abstract: In this paper, we propose an approach and basic constructs to realize a fuzzy database processing capability on an Object-Oriented Database (OODB) system. The proposed approach can manage several types of uncertainties: (1) uncertain objects, (2) uncertain relationships between instance objects, (3) uncertain instance-of relationships, and (4) uncertain is-a (subclass/superclass) relationships. A notable feature is the usage of extensibility offered by OODB systems. That is, it is possible to add these several uncertainties without restructuring a database schema. We will describe our prototype fuzzy OODB system and briefly show the functionalities of the system by using an example movie database.
28 citations
08 Apr 1991
TL;DR: The TextLink-III system that was developed based on this idea and that is currently running and the notable features are the following: document objects are classified by class hierarchy and the notion of class expression is used for formulating a query for a class hierarchy; multiple viewpoint support; and less link maintenance against data updates.
Abstract: A new idea is proposed for constructing object-oriented hypertext database systems: query pairs as hypertext links, where each query is defined over a collection of document objects that are classified using a class hierarchy. With this idea, users need not modify their hypertext links against the insertions, deletions and updates of document objects. Also, when a database schema (here, a class hierarchy) evolves, a systematic method can be considered to modify user-defined query-pair links. The TextLink-III system that was developed based on this idea and that is currently running is described. The notable features of TextLink-III are the following: document objects are classified by class hierarchy and the notion of class expression is used for formulating a query for a class hierarchy; multiple viewpoint support; and less link maintenance against data updates. >
25 citations
11 Sep 1991
TL;DR: In order to handle structured query language (SQL) queries as generic/polymorphic methods, the authors extended the ordinary SQL and introduced a mechanism to attach query methods dynamically to several kinds of relational database constructs.
Abstract: An approach is described to realize a hypertext-like navigation over relational database management systems (DBMSs) by encapsulating query methods to relational database constructs (attribute-values, tuples, columns, and relations) and by invoking those query methods directly over user-selected data. In order to handle structured query language (SQL) queries as generic/polymorphic methods, the authors extended the ordinary SQL and introduced a mechanism to attach query methods dynamically to several kinds of relational database constructs. They present their prototype system, called SQL-Navigator, which currently runs on the NeXT Sybase relational DBMS. >
1 citations