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Search Publications by: David Holmberg (Fed)

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Displaying 51 - 61 of 61

Secure Messaging in BACnet

November 1, 2005
Author(s)
David G. Holmberg
A proposal for BACnet secure messaging is nearing public release by the BACnet standard committee (ASHRAE SSPC-135). The proposal adds a level of BACnet specific security to existing IT security, extending the BACnet standard to offer basic security using

Workshop to Define Information Needed by Emergency Responders During Building Emergencies

January 3, 2005
Author(s)
Walter W. Jones, William D. Davis, D D. Evans, David G. Holmberg, Steven T. Bushby, K A. Reed
On May 3, 2004, NIST sponsored a workshop to identify the information needs for emergency responders. The purpose of this workshop was to obtain guidance on the type of building static and dynamic tactical information needed by public safety officials, how

Enemies at the Gate: Securing the BACnetRG Building.

December 1, 2003
Author(s)
David G. Holmberg
The building automation industry is moving away from isolated building control systems toward building automation systems (BAS) integrated with business applications on a shared "IT" network. This open shared architecture allows not only for integration of

Enemies at the Gates: Securing the BACnet building

November 1, 2003
Author(s)
David G. Holmberg
This article seeks to increase awareness of the threats associated with connecting the building control system (specifically a BACnet system) to a wider network. In addition, it presents countermeasures available for addressing security threats

BACnet Wide Area Network Security Threat Assessment

July 1, 2003
Author(s)
David G. Holmberg
This technical report addresses inter-networked building automation and control systems (BAS or BCS) using the BACnet protocol [ANSI/ASHRAE, 2001]. The report deals with threats from known sources due to communication connections to the corporate LAN and

BACnet Wide Area Network Security Threat Assessment.

July 1, 2003
Author(s)
David G. Holmberg
This technical report addresses inter-networked building automation and control systems (BAS or BCS) using the BACnet protocol [ANSI/ASHRAE, 2001]. The report deals with threats from known sources due to communication connections to the corporate LAN and

A Progress Report on the NIST Convective Heat Flux Calibration Facility

March 15, 1999
Author(s)
David G. Holmberg, C A. Womeldorf
The National Institute of Standards and Technology has developed a convective heat flux calibration facility to allow evaluation of heat flux sensors. This facility is a small wind tunnel that produces a two-dimensional laminar boundary layer across a

Performance and Modeling of Heat Flux Sensors in Different Environments

January 1, 1999
Author(s)
David G. Holmberg, C A. Womeldorf
Heat flux measurement is not simple; care is required in selecting a suitable sensor for a given application. Surface substrate properties and the convective and radiative environment determine the choice of sensors. Mounting of the sensor, especially in

Report on the First-Generation NIST Convective Heat Flux Calibration Facility

December 10, 1998
Author(s)
David G. Holmberg, C A. Womeldorf
The National Institute of Standards and Technology has developed a convective heat flux calbration facility to allow evaluation of heat flux sensors. This facility is a small wind tunnel that produces a two-dimensionl laminar boundary layer across a heated

Facility for Calibrating Heat Flu Sensors in a Convective Environment

January 1, 1997
Author(s)
David G. Holmberg, Kenneth D. Steckler, C A. Womeldorf, William L. Grosshandler
The National Institute of Standards and Technology (NIST) presently conducts heat flux sensor calibrations using standard radiation methods. In practice, however, many heat flux sensors are used in test environments where convective heat transfer dominates