San Francisco International Airport Noise Impact Analysis, Brisbane, California, USA, C. Michael Hogan. January 7,  2001.   Field measurements and computer modeling was utilized to assess the viability of an affordable housing condominium complex.  An airport noise contour map was produced to allow interpretation of noise exposure impacts to future residents.  Consideration was given to forecasts of future air traffic and future aircraft fleet hardware.  Mitigation measures were developed to produce specific site plan measures and building skin designs to minimize ultimate noise exposure impacts.

Hybrid Vehicle Noise Emission Comparison Study, C. Michael Hogan and Amy Gregory, June 1, 2006.   The hybrid vehicle Prius was chosen as a comparison model to conventional internal combustion engines of the same size class.  Emphasis was placed on low to medium speed operation to demonstrate differences in noise emission levels, since at very high operating velocities aerodynamic and tyre noise will dominate.  Results show substantially lower noise emissions from the hybrid vehicle compared to conventional vehicles of the same size and weight class.

Antananarivo, Madagascar Environmental Noise Survey, C. Michael Hogan, April 12, 2006.
A noise survey was conducted for a portion of the city's core to understand exposure statistics, day/night variation and principal sources.  As in most large cities of the world, motor vehicles are the predominant source of noise.  Ironically the sound levels are attenuated somewhat by the extreme congestion during peak traffic hours.  Nevertheless a considerable portion of the population is exposed to sound levels higher than the benchmark value of 60 CNEL.

Dual-carriageway Noise from A90 in Aberdeenshire, Scotland. C. Michael Hogan. Field testing and computer modeling was conducted for land uses east and west of this high volume roadway to understand exposure levels and day/night variation.  While nighttime sound levels drop significantly, there remain trucking operations which are known to contribute disproportionately to sound levels.  Significant  variation was demonstrated with wind direction and wind speed changes.  Also noteworthy were the terrain variation between Aberdeen and Stonehaven, which caused further deviations from mean sound levels measured at a reference receptor distance. 

 Healdsburg, California, USA Noise Element of the General Plan, C. Michael Hogan. December 11, 1999.  Comprehensive acoustical mapping was conducted for the entire city of Healdsburg as an initial step in characterizing the noise environment pursuant to requirements of the state of California.  Attention was given to analyzing sound levels at sensitive receptor locations such as residences, schools and hospitals.  The goal of the investigation was to produce a land use compatibility table recommending appropriate standards for maximum noise exposure for each land use classification.  Although most of the acoustical exposure throughout the city is due to roadway sources, great public interest was evinced in certiain stationary sources within the city.

San Francisco Peninsula CalTrain Noise Impact Evaluation, USA. C. Michael Hogan and Sixto Alcantara.  (1994).  In seven different cities on the San Francisco field measurements combined with computer simulation were carried out to examine impacts to residential receptors along the CalTrain right-of-way.  In general CNEL levels were at acceptable values except for those residing within about 150 meters from the rail right-of-way; however single event noise was high including warning signals from trains and crossings.  Recommendations were made by city for appropriate building skin design for new residences constructed near the CalTrain right-of-way.