Knowledge management systems can be defined as information and communication technology based systems developed to support the management of knowledge assets in the organization. This support is performed by facilitating collecting, organizing, storing, sharing, searching and retrieving knowledge and sharing it among knowledge workers. In this research we describe a framework of a semantic based knowledge management system for aerospace collaborative working environments. We also identify the design principles, system architecture and technological implantation of the system which is developed and implemented as part of integrated and virtually produced tools and functionalities for a collaborative and distributed working environment. The introduced system depends mainly on Latent semantic Indexing techniques and a set of evolving ontologies as underlying resource for searching and retrieving shared knowledge documents according to the semantic correlations with the knowledge worker's queries. The main goal of this research is to help knowledge workers effectively share, search and retrieve required knowledge from shared and vast knowledge bases in their collaborative working environment.
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