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On January 14, 2004 President George W Bush outlined a new vision for NASA that has humans venturing back to the moon by 2020. With this ambitious goal, new tools and models have been developed to help define and predict the amount of space radiation astronauts will be exposed to during transit and habitation on the moon. A representative scenario is used that includes a trajectory from LEO to a Lunar Base, and simplified CAD models for the transit and habitat structures. For this study galactic cosmic rays, solar proton events, and trapped electron and proton environments are simulated using new dynamic environment models to generate energetic electron, and light and heavy ion fluences. Detailed calculations are presented to assess the human exposure for transit segments and surface stays.

This paper describes the joint development of a data model exchange interface based on STEP AP212 to support the flow of electrical data through the design process - specifically between the Mentor Graphics CHS (ECAD) system and the UGS NX3 (MCAD) system. The reasons for selecting AP212 in preference to the AP210 and KBL data exchange protocols are discussed. The scope of the interface is discussed, and examples are presented of the translation of real-world electrical objects into the AP212 data model. The definition of the exchange file format is described, with examples, and the reasoning behind its design is discussed.