Crosslink Winter 2000/2001 Contributors

Concurrent Design at Aerospace

Clockwise from left: Thomas W. Trafton is Director of the Vehicle Concepts Department, which has been leading the development of the Concept Design Center. He holds a B.S. in mechanical engineering from California State Polytechnic University in San Luis Obispo and has been with Aerospace since 1966 (thomas.w.trafton@aero.org). Stephen P. Presley, Associate Director, Vehicle Concepts Department, oversees the work of the Concept Design Center. He holds a B.S. in engineering from the University of Washington and an M.A. in organizational leadership from Chapman University. He has been with Aerospace since 1990 (stephen.p.presley@aero.org). Patrick L. Smith, Principal Director, Architecture and Design Subdivision, has many years of experience in Kalman filters and control. He supported efforts to improve the Air Force acquisition of space systems, particularly in the area of risk analysis. He holds a Ph.D. in control systems engineering from the University of California at Los Angeles and has been with Aerospace since 1968 (patrick.l.smith@aero.org). Rhoda G. Novak, former Director of the Software Acquisition and Analysis Department, founded the Concept Design Center's Ground Systems Team. She holds an M.S. in computer science from Loyola Marymount University and has been with Aerospace since 1978 (rhoda.g.novak@aero.org). Andrew B. Dawdy, Vehicle Concepts Department, is one of the founding developers of the Concept Design Center. He manages a section responsible for systems engineering and conceptual system design. He holds an M.S. in aeronautics and astronautics from the University of Washington and has been with Aerospace since 1992 (andrew.b.dawdy@aero.org).

Estimating Probable System Cost

Stephen A. Book, Distinguished Engineer, Systems Engineering Division, was a member of the 1998 Cost Assessment and Validation Task Force on the International Space Station and the 1998–99 National Research Council Committee on space shuttle upgrades. Book shared the 1982 Aerospace President's Achievement Award for work showing that a particular nonuniform 18-satellite Navstar GPS constellation would satisfy the original GPS system requirements, with potentially large cost savings. He holds a Ph.D. in mathematics with concentration in probability and statistics from the University of Oregon and has been with Aerospace since 1979 (stephen.a.book@aero.org).

Space Launch Vehicle Reliability

I-Shih Chang, Distinguished Engineer, Vehicle Performance Subdivision, leads research on space launch vehicle failures and on solid-rocket-flow and thermal analyses. He has organized workshops on rocketry for the American Institute of Aeronautics and Astronautics and is a panel member of the White House Space Launch Broad Area Review Task Force. He has a Ph.D. in mechanical engineering from the University of Illinois and has been with Aerospace since 1977 (i-shih.chang@aero.org).

Small-Satellite Costs

David A. Bearden, Civil and Commercial Division, is Systems Director of the JPL and NASA Langley Independent Program Assessment Office, supporting programs such as Mars Exploration, New Millennium, and Discovery. He led development of the Small Satellite Cost Model, as well as its application to NASA independent reviews and deployment of the Concurrent Engineering Methodology at JPL's Project Design Center. Bearden is also editor of this issue of Crosslink. He holds a Ph.D. in aerospace engineering from the University of Southern California and has been with Aerospace since 1991 (david.a.bearden@aero.org).

Space-Based Systems for Missile Surveillance

Terrence S. Lomheim, Distinguished Engineer, Sensor Systems Subdivision, leads focal-plane technology development and electro-optical payload design and optimization. He has published 29 articles on these topics. Lomheim received the Aerospace President's Achievement Award in 1985 for his work with focal-plane technology. He holds a Ph.D. in physics from the University of Southern California and has been with Aerospace since 1978 (terrence.s.lomheim@aero.org). David G. Lawrie, Director, Sensing and Exploitation Department, leads modeling and simulation efforts in support of space-based surveillance programs. He was the recipient of The Aerospace Corporation's highest award, the Trustees' Distinguished Achievement Award, in 1997 for his role in developing a new national early-missile-warning system. He holds a Ph.D. in astronomy from the University of California at Los Angeles and has been with Aerospace since 1986 (david.g.lawrie@aero.org).