Capturing essential questions using question support facilities in the VIEW classroom

Kagawa, Osami; Katayama, Kaoru; Konomi, Shin’ichi; Kambayashi, Yahiko

doi:10.1007/bfb0049110

Cited by 6 publications

(2 citation statements)

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“…Deputy objects can also be used for presentation in VIEW Classroom -a distant education system [18] as shown in Figure 10. We assume presentation materials are stored as objects in objectbases.…”

Section: 3mentioning

confidence: 99%

An object deputy model for realization of flexible and powerful objectbases

Kambayashi

Peng

1996

Journal of Systems Integration

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Abstract. In object-oriented databases, data and methods are combined by objects and their classes. Information redundancies are removed by the notions of class hierarchy and inheritance. This contributes the realization of high-performance systems. However, the flexibility of object structures still remains a problem due to its encapsulation feature. In this paper, we introduce an object deputy model which extends conventional objectoriented models with the concepts of deputy objects and deputy classes. A deputy object has its own identifier and may possess its own attributes and methods. It can also have attributes that are computed from values stored within its source object, and can be associated with methods generated from these of the source object. The inheritances are realized by switching operations, which make it possible to realize controllable, selective and dynamic inheritance structures. Schemata of deputy objects are defined by deputy classes which can be derived by an object deputy algebra. An object can have many deputy objects, and several objects can share a single deputy object. Thus, objects can be indirectly divided and combined through their deputy objects. We show that several difficult database problems, such as flexible views, objects with more than one role, object migration, and multiple inheritance become much easier in this model. The data-knowledge coordination model developed for the integration of distributed databases and knowledge-bases can also be realized easily by the object deputy model. Finally, we discuss several advanced database applications of this model, such as geographic databases, virtual office systems, and distant education systems.

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Section: 3mentioning

confidence: 99%

An object deputy model for realization of flexible and powerful objectbases

Kambayashi

Peng

1996

Journal of Systems Integration

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“…We are developing VIEW (Virtual Interactive E n vironment for Work-groups) systems [7] which includes an oce system [13], a distance education system [6], and a conference system [8] utilizing object-oriented database (OODB) technology. In order to realize these systems, we need model environ- 3 This work was done at Kyoto University ments that are rooms, such as working rooms, classrooms and meeting rooms, where users work together by sharing documents and equipment through available communication facility.…”

Section: Introductionmentioning

confidence: 99%

Realization of computer supported cooperative work environments using the object deputy model

Peng

Kambayashi²

Proceedings. IDEAS'98. International Database Engineering and Applications Symposium (Cat. No.98EX156)

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In conventional computer supported c ooperative work (CSCW) systems, usually only one video-based environment is shared by all the users. In this paper, we will show that multiple environments are r equired and they can be r ealized utilizing object-oriented database technology. A cooperative work environment can be r egarded a s a r oom where users work together by sharing documents and equipment through available communication facilities. In one environment, users, documents and equipment are handled as objects and these dierent types of objects have some attributes and methods in common, such as location attributes and layout methods. However, using the existing concepts of the conventional object-oriented model, such as class, complex object and collection object, it is dicult to dene one environment namely a set with dierent types of elements but having some attributes and methods in common. The object deputy model introduced by the authors can be extended t o formulate such environments. Since the object deputy model can uniformly handle object views, roles, migration and multiple inheritance, we can realize exible, dynamic and powerful environments based on objectoriented databases.

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