Co-Ordinated Decentralised Computer Systems
Due to the decreasing cost of computer hardware the trend in computer development has been away from the large centralised computer systems and towards a large number of autonomous microcomputer systems. This development has had many benefits not least the local departmental control over the operation of the system and also the increase in availability. But it also has its disadvantages, the main ones being the difficulty in exchanging information between autonomous systems and secondly the inability to share underutilised and expensive resources. Local networks provide a high speed communication facility between computers within a radius on one or two kilometres. The communication media is usually coaxial cable and the transfer speed is comparable with disk transfer rates. The local network provides the ability to exchange information rapidly and easily and also the ability to share resources. The next stage in the development is to weld the loosely connected systems into a coordinated decentralised computer system by a distributed operating system. This paper discusses a project in this area.
KeywordsHospital Information System Coaxial Cable File Store Distribute Operating System Local Computer Network
Unable to display preview. Download preview PDF.
- (1).Kimbleton SR. The NBS experimental network operating system. Distributed systems — Architecture and Implementation: Lecture Notes in Computer Science No. 105, Springer Verlag 1981; 308–356.Google Scholar
- (2).Bakker AR. Centralisation and decentralisation aspects in hospital information systems. Lecture Notes in Medical Informatics, Springer Verlag 1981; 41–49.Google Scholar
- (3).James RM, Viale RO. The evolution of a data communications network in an university hospital. Lecture Notes in Medical Informatics, Springer Verlag 1981; 922–927.Google Scholar
- (4).Jensen ED. Distributed Control. Distributed Systems — Architecture and Imp¬lementation: Lecture Notes in Computer Science No.105, Springer Verlag 1981; 195–190.Google Scholar
- (7).Metcalfe RM, Boggs DR. Ethernet: Distributed packet switching for local com¬puter networks. Comm ACM Vol. 19 No. 7, July 1976.Google Scholar
- (8).Holler E. The National Software Works. Distributed Systems — Architecture and Implementation: Lecture Notes in Computer Science No.105, Springer Verlag 1981; 421–442.Google Scholar
- (9).Svobodova L, Liskov B, Clark D. Distributed Computer Systems: structure and semantics. MIT LCS TR-215 1979.Google Scholar
- (12).Solomon MH, Finkel RA. The Roscoe Distributed Operating System. Proceedings of the 7th Symposium of Operating System Principles (ACM Order No. 534790 ), Dec 1980; 108–114.Google Scholar