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ommunications world
􀂄 Provides:
􀂄 World-wide broadcasting capability
􀂄 Mechanism for information dissemination
􀂄 Medium for collaborative work group environment
􀂄 Open standards & accessibility:
􀂄 Evolved into powerful environment to support distributed
group work
􀂄 Moved from unidirectional to full-blown clientserver
medium
􀂄 Able to run line-of-business applications and deal
with the complex requirements of
e-Commerce􀂄 Each facet isolated in terms of:
􀂄 Control
• data protection, maintainability, etc
􀂄 Scalability
• decreased load on database server
􀂄 Flexibility
• client & database independent
Client-server technologyVisualisation technology
􀂄 Today, visualisation technology used in many
application areas such as engineering, construction,
medicine, military etc
􀂄 In the main for product design, assessing operation
and maintenance issues and promoting collaboration
between project teams; training and sales and
marketing
􀂄 Visualisation combined with an integrated and
collaborative approach, offers:
􀂄 Test proposed projects prior to construction
􀂄 Walk-through views to identify problems and design
improvements made earlier in the process
􀂄 Providing a free flow of information between CAD systems
and other applications
􀂄 Facilitating the selection of
alternative designs􀂄 CAD exchange formats
􀂄 IGES (Initial Graphics Exchange Format)
􀂄 DXF (Data Interchange Format)
􀂄 Distributed computing
􀂄 RPC, CORBA, DCOM, RMI
􀂄 Electronic Data Interchange (EDI)
􀂄 CITE
Exchange standards􀂄 Emerged with development of ‘next’ generation’
DBMS and data exchange standards such as STEP
􀂄 STandard for Exchange of Product Data international
standard for the exchange of PM data
􀂄 Launched in 1983 with long-term ambition of improving
communication of engineering information and …
􀂄 enabling integration by co-ordination of open standards for data
exchange and sharing
􀂄 ‘new generation’ of data exchange standards
intended to enable software to share engineering
information not simply graphical representations
􀂄 standardising way engineering information is held,
facilitate accurate, coherent, and
unambiguous transfer
Information standards (Product Models)􀂄 A formal way of capturing concepts and
facts
􀂄 With an explicit set of usage rules
􀂄 together, these represent a specified
aspect of a physically realisable artefact
􀂄 Product models are …
􀂄 simplified yet complete
􀂄 accurate, coherent and unambiguous
􀂄 computer sensible
A Product Model is …􀂄 EXPRESS language (Part 11):
􀂄 Standard language for data specification that forms a neutral
human-readable and computer-processable conceptual schema
􀂄 Exchange structure (Part21):
􀂄 Defines the format of an exchange structure
􀂄 SDAI (Standard Data Access Interface - Part 22):
􀂄 SDAI effectively makes EXPRESS a generic object-oriented
language and turns every valid EXPRESS schema into a本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。