A design knowledge base and database modeling language, named Integrated Data Description Language (IDDL), was developed at the University of Tokyo to model both design processes and design objects.
A meta-model mechanism was introduced to model meta-knowledge in design to select appropriate design knowledge bases based on design requirements, control the design processes, and manipulate the design databases.
An intelligent CAD system, called Intelligent Integrated Interactive CAD (IIICAD), was developed based on the IDDL and the meta-model.
The database modeling scheme of the IDDL was improved as a feature-based modeling scheme to describe different product life-cycle aspects. This feature modeling scheme was also used in the Internet based concurrent design system, and the Web based concurrent design system.
The feature based modeling scheme was improved as an artifact based modeling scheme for developing a generic product modeling scheme through research collaboration with the National Institute of Standards and Technologies (NIST), Gaithersburg, Maryland, USA.
The knowledge-based design database modeling approach was integrated with optimization methods in the development of a quantitative intelligent system for concurrent design.
A design candidate evaluation method was introduced by combing
neural networks and fuzzy logic for conceptual design.
The IIICAD system was developed for the New Japan Steel Corporation, Japan as a prototype system for modeling both design knowledge base and design database.
The feature-based product modeling system was modified as an application for Gienow Windows and Doors, Calgary, Canada to model the design and manufacturing information of the windows and doors.