( )Engineering Information Abstracts Part II154

Title: TAILORING Z39.50 ON EXISTING DATABASES: THEARCA PROJECT

( )Author s : Loffredo, M.; Baldacci, M.B.; Signore, O.Corporate Source: CNUCE, Pisa, ItalyConference Title: Proceedings of the 1997 8th InternationalWorkshop on Database and Expert Systems Applications,DEXA’97 Conference Location: Toulouse, Fr ConferenceDate: 19970901-19970902Source: International Conference on Database and ExpertSystems Applications- DEXA 1997. IEEE, Los Alamitos, CA,USA,97TB100181. p 332-338 CODEN: 002689Publication Year: 1997Abstract: The Z39.50 protocol aims at opening databases toclient-server communication. However, in the case of largedatabases, as OPACs are, the migration to the client-serverarchitecture may require significant effort. This can hardlylimit the diffusion of the open systems environment. TheARCA project gives solutions to these problems by providinga system which makes an OPAC a Z39.50 target with aminimal effort. The paper describes the basic ideas, the gen-eral architecture and the main functionality of the system

Žoutlining its contribution to systems interoperability. Author.abstract 12 Refs. In English EI Order Number:

EIP97103857748Keywords: Distributed database systems; Information re-trieval; Network protocols; Computer architecture

Title: INTERACTIVE VISUALIZATION THROUGH AP-PLIED VIRTUAL REALITY IN CONSTRUCTION

( )Author s : Jones, Brigitte; Webb, IanCorporate Source: Univ of Salford, Salford, UKConference Title: Proceedings of the 1997 International Con-ference on Information Visualization, IV Conference Loca-tion: London, Engl Conference Date: 19970827-19970829Source: Proceedings of the Information Visualization Confer-ence 1997. IEEE, Piscataway, NJ, USA,97TB100165. p 166-172CODEN: 002219Publication Year: 1997Abstract: This paper is concerned with the development of an

Ž .integrated, open and fully usable Virtual Reality VR envi-ronment for the construction industry for use on a low-cost

Ž .PC but transportable to other, mare sophisticated systems tomake VR accessible and usable by Small and Medium Enter-

Ž .prises SME’s . The paper describes a new VR system forcollaborative interaction in the construction industry that en-hances communication between the design team, contractorsand sub-contractors through open systems design. It discusseshow feedback from potential users of these VR systems isassessed and implemented, to ensure systems are designed tomeet user requirements. By enabling the use and integrationof a wide variety of multimedia technologies, communicationchannels between different construction parties become more

Ž .effective. Author abstract 10 Refs. In English EI OrderNumber: EIP97103862963Keywords: Interactive computer systems; Virtual reality; Con-struction industry; Information technology; Personal comput-ers; Computer aided design ; Computer architecture

Title: DESIGN GUIDELINES FOR ‘TAILORABLE’ FRAME-WORKS

( )Author s : Demeyer, Serge; Meijler, Theo Dirk; Niertstrasz,Oscar; Steyaert, PatrickCorporate Source: Univ of Berne, Berne, SwitzSource: Communications of the ACM v 40 n 10 Oct 1997. p60-64 CODEN: CACMA2 ISSN: 0001-0782Publication Year: 1997Abstract: Object-oriented frameworks encapsulate a reusable,tailorable software architecture as a collection of collaborat-ing, extensible object classes. These frameworks are particu-larly important for developing open systems in which not onlyfunctionality but architecture is reused across a family ofrelated applications. Unfortunately, the design frameworkshave inherent conflict between reuse and tailorability. Threeguidelines, namely, interoperability, extensibility, and distribu-tion, help to solve this conflict and design open system archi-tectures by identifying hot spots and contracts, thereby balanc-ing flexibility and tailorability. 4 Refs. In English EI OrderNumber: EIP97103858462Keywords: Software engineering; Object oriented pro-gramming; Computer simulation; Computer architecture;Computer systems programming; Data storage equipment

Title: TMN-BASED SCHEDULERS FOR SS7 ROUTINGVERIFICATION TESTS

( )Author s : Glitho, Roch H.Corporate Source: Ericsson Research, Town of Mount Royal,Que, CanSource: Computer Communications v 20 n 6 Jul 25 1997. p428-434 CODEN: COCOD7 ISSN: 0140-3664Publication Year: 1997Abstract: Routing verification tests have been specified by the

Ž .ITU-T as open system interconnection OSI systems manage-ment-based functions to audit routing tables in live signalling

Ž .system no. 7 SS7 networks. They generate a considerableamount of messages and can easily trigger congestion. Cir-cumspection is therefore required when using them, especiallywhen they are used to audit thoroughly and periodically allthe routing tables of a network. This paper proposes a central-ized and a distributed algorithm for scheduling routing verifi-cation tests in SS7 networks. It suggests as well a telecommu-

Ž .nications management network TMN based implementationŽ .of the algorithms. Author abstract 13 Refs. In English EI

Order Number: EIP97103857688Keywords: Telecommunication networks; Telecommunication

Ž .traffic; Communication channels information theory ; Algo-rithms

Title: DEVELOPING A MULTISTACK ISO-SRrrrrrZ39.50 AP-PLICATION GATEWAY

( )Author s : Andreadis, Dimitrios; Patel, AhmedCorporate Source: Univ Coll Dublin, Dublin, UKSource: Computer Standards & Interfaces v 18 n 5 Jun 1997. p397-415 CODEN: CSTIEZ ISSN: 0920-5489Publication Year: 1997Abstract: The growth of computer networks, in particular theInternet, led to the creation of methods for libraries that