Showing papers on "Heterogeneous network published in 1987"

A name service for evolving heterogeneous systems

Abstract: A prototype implementation has been built as part of the Heterogeneous Computer Systems project at the University of Washington. This service supports RPC binding and other applications in our heterogeneous environment. Measurements of the performance of this prototype show that it is close to that of the underlying name services, due largely to the use of specialized caching techniques.

Heterogeneous distributed database management: The HD-DBMS

Abstract: The proliferation of different DBMS and advances in computer networking and communications have led to increasing heterogeneous distributed DBMS network scenarios. Major heterogeneity problems and challenges include: different database models, syntactically and semantically different DBMS, different types of controls (recovery, etc.), etc. We address herein the long-range goal for a heterogeneous distributed DBMS (HD-DBMS) to be able to support a network in which any user in any node can be given an integrated and tailored view or schema, while in reality the data may reside in one single database or in physically separated databases, managed individually by the same type of DBMS (by the only one the user understands) or by different DBMS. We cite the major approaches to data sharing and accessing: from the primitive commercial file and database unload/load and PC download, to common interfaces on top of existing DBMS, to the R&D and prototype efforts toward the long-range desires. Commercial availability of the more encompassing thrusts may become a reality with the mounting problems, opportunity costs, and demand for data sharing in the heterogeneous world. Major research and development projects in this arena are leading toward some partial attainment of the long-range objective. The UCLA HD-DBMS project is highlighted herein, with a presentation of its status, progress, and plans. It is a longer range project, with the unique feature of allowing any user in the network to use a preferred database model and DML to access or update any data in the heterogeneous network. HD-DBM5 is to provide a multilingual interface to heterogeneous distributed databases.

A method for interconnecting heterogeneous computer networks

Abstract: The real problems of network interconnection lie in the management of heterogeneity. The heterogeneity is not confined to the mechanical protocols but to much wider issues such as service philosophy (connection-orientated vs connectionless), addressing, routing, applications models, management facilities and the foresight of the network designers in allowing for interconnection with alien networking systems. This paper describes a system which interconnects two heterogeneous networking environments through a third (local) system. Application layer relaying was chosen to provide the services of computer mail and remote terminal access. The interconnection architecture uses special network front-ends and a local area network to provide a flexible and manageable system. A transport service interface is used to provide functional separation between the front-ends and general purpose computers, including the relays.

Computer networking for large computers in Universities

Abstract: N-1 protocol was developed for construction of a computer network which connects universities in Japan. N-1 protocol has been adopted by Inter-University Computer Network and University Library Network.NACSIS has started the construction of Science Information Network which will provide an infrastructure for digital communication for universities in Japan. High speed digital lines has been leased from NTT for that purpose.A local area network was constructed at the Faculty of Engineering at the University of Tokyo. The network consists of an optical fiber backbone network and many IEEE802.3 10Mbps baseband networks connected to the backbone. Connection to large computers was one of the key issues in the planning of that network.

Design and Implementation of an Extendible Distributed System

Abstract: The extension of a local, module-based operating system kernel to a distributed kernel for homogeneous and heterogeneous networks is discussed. This discussion is founded on a widely known software design using Remote Procedure Call. Our purpose is to show how this design can be implemented without any major change of the existing kernel.