Papers by Author: Ying Chen

Abstract: Through analysis of the current version of relationship models, the paper presents the short points of them and develops a new PDM multi-version management model based on the theory of polychromatic sets with the concept and method of the theory introduced. This new PDM multi-version management model uses the element of polychromatic sets to represent the version of a document, a uniform color to represent the integrated attribute of object, and individual color to represent the property information of an object version respectively. Considering adjacent versions have too many identical contents, this new model introduces a method on difference information to reduce the storage space of multi-versions. Finally, the arithmetic operators of the version management model of PDM were presented through a related case.

Abstract: In this paper, a workflow model based on N-tree for process management in PDM system is presented. It streamlines circuits in process management to sequence, branch, parallel, and loop patterns. It also offers this workflow model’s mechanisms of construction, executing, and state transition by definitions of workflow’s node properties, node constraints and state set. Last it exhibits an instance of applying this workflow model to process management of a simple PDM system.