paper, delivered at ASHRAE 1988 General Meeting held in conjunction with the AHR Expo 1988, in Dallas, TX. "Certificate of Merit awarded to MIT digital control system" - Energy User News, December 1991 "Integrating VAV zone requirements with supply fan operations" - ASHRAE Journal, April 1993 External links http://www.DDC-online.org/ - University of Iowa Energy Center-hosted reference site on DDC principles and Digital Controls system manufacturers http://www.asicontrols.com/ - company website Technology companies established in 1986 Heating, ventilation, and air conditioning companies 1986 establishments in California San Ramon, California