Optical Disk Data Storage

Kenville,

doi:10.1109/mc.1982.1654078

Cited by 7 publications

(2 citation statements)

References 2 publications

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“…CDROM systems enable a single twelve centimetre digital optical disc platter [4] to hold as much as 600 Mbytes of data. This is equivalent to about 1600 conventional floppy disks.…”

Section: Hardware Developmentsmentioning

confidence: 99%

Automation of the CAS Document Delivery Service.

Steensland

Soukup²

1986

The Electronic Library

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This paper describes the automation of the retrieval of online orders for the CAS Document Delivery Service. By shifting from a process using stand‐alone terminal to a process linked to a Unix network, we were able to improve the productivity of the staff responsible for operating the service and the speed with which electronic orders were dispatched. A similar shift could be used by other companies to capture online information from external sources.

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“…CDROM systems enable a single twelve centimetre digital optical disc platter [4] to hold as much as 600 Mbytes of data. This is equivalent to about 1600 conventional floppy disks.…”

Section: Hardware Developmentsmentioning

confidence: 99%

Automation of the CAS Document Delivery Service.

Steensland

Soukup²

1986

The Electronic Library

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“…Storage capacity of optical devices presently under development ranges from 1.25 to 4.00 and 5.00 Gbytes (1 gigabyte is equal to 1024 megabytes), whereas in general read and write times for optical and magnetic disks are expected to be roughly the same [ 12,171. Further development efforts are concentrating on devices with multiple optical disks ("jukeboxes") with storage capacity from 1250 Gbytes to 2000 Gbytes, at maximum access time below 5 seconds [25,311. Prices for commercially available optical storage (e.g., A Temporally Oriented Data Model l 501 Drexon II) are already below the price per bit on magnetic tape-traditionally the least expensive storage medium directly manipulable by computers.…”

Section: Introductionmentioning

confidence: 99%

A temporally oriented data model

Ariav

1986

ACM Trans. Database Syst.

139

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The research into time and data models has so far focused on the identification of extensions to the classical relational model that would provide it with "adequate" semantic capacity to deal with time.The temporally oriented data model (TODM) presented in this paper is a result of a different approach, namely, it directly operationalizes the pervasive three-dimensional metaphor for time. One of the main results is thus the development of the notion of the data cube: a three-dimensional and inherently temporal data construct where time, objects, and attributes are the primary dimensions of stored data. TODM's cube adds historical depth to the tabular notions of data and provides a framework for storing and retrieving data within their temporal context. The basic operations in the model allow the formation of new cubic views from existing ones, or viewing data as one moves up and down in time within cubes. This paper introduces TODM, a consistent set of temporally oriented data constructs, operations, and constraints, and then presents TOSQL, a corresponding end-user's SQL-like query syntax. The model is a restricted but consistent superset of the relational model, and the query syntax incorporates temporal notions in a manner that likewise avoids penalizing users who are interested solely in the current view of data (rather than in a temporal perspective). The naturalness of the spatial reference to time and the added semantic capacity of TODM come with a price-the definitions of the cubic constructs and basic operations are relatively cumbersome. As rudimentary as it is, TODM nonetheless provides a comprehensive basis for formulating an external data model for a temporally oriented database.

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Video discs in education

Barker

1986

Education and Computing

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Optical Disk Data Storage

Cited by 7 publications

References 2 publications

Automation of the CAS Document Delivery Service.

Automation of the CAS Document Delivery Service.

A temporally oriented data model

Video discs in education

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