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H.
Christopher Frey
News Archive:
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Brandon Graver, an MS student working with Dr. Frey, was
featured in the Southeastern Transportation Center’s Summer 2010 Research Spotlight for his work on
measuring the activity, energy use, and emissions of passenger railroad
locomotives.
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Dr. Frey is starting a new collaborative research
project, with Co-PI Dr. Nagui M. Rouphail, that will focus on the linkage between travel
simulation and vehicle emissions models and their application to evaluation
of traffic management strategies and emissions impacts. The new project is sponsored by the U.S.
Environmental Protection Agency and was selected via a scientific peer
review process under the STAR grants program. The project will be administered as a
cooperative agreement with the U.S. EPA.
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Dr. Frey’s group has recently published two new papers in
Environmental Science and Technology. One paper, by postdoctoral research
associate Dr. Hyung-Wook Choi and Dr. Frey, is
regarding a method for quantifying the
real-world energy use and emissions of a plug-in
hybrid electric school bus.
The other, by Dr. Frey, Dr. Kaishan Zhang
(now with the California Air Resources Board, and Dr. Rouphail
(director of the Institute for Transportation Research and Education
located at NCSU) is regarding a method for modeling the
emissions of individual vehicles based on second-by-second data obtained
from Portable Emissions Measurement
Systems.
   
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Brandon Graver, an MS student working with Dr. H.
Christopher Frey, received the first‐place Masters‐level platform paper award at the 2010 Annual Meeting of
the Air & Waste Management Association.
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Dr. Frey and colleagues have recently published in Transportation Research Record a
methodology for inventorying construction fleet emissions. The method is based on the use of
representative real-world measurements of construction vehicles obtained by
means of a portable emissions measurement system (PEMS). Recommendations are made about
development and practical applications of emissions inventories for
construction fleet management.
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Dr. Frey and collaborators have recently published in Environmental Science and Technology
a methodology for estimating high-resolution, regional on-road vehicle emissions
and the associated reductions in air pollutant emissions from vehicles that
utilize alternative fuels or propulsion technologies. The fuels
considered are gasoline, diesel, ethanol, biodiesel, compressed natural
gas, hydrogen, and electricity. The technologies considered are internal
combustion or compression engines, hybrids, fuel cell, and electric. Road
link-based emission models are developed using modal fuel use and emission
rates applied to facility- and speed-specific driving cycles. The methodology makes use of
second-by-second data from field measurements using Portable Emission
Measurement Systems (PEMS) in order to develop correction factors for
real-world driving cycles.
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In addition to previous studies in Dr. Frey’s group that
compared energy use and emissions of dump trucks and construction vehicles fueled with B20 biodiesel versus petroleum
diesel, we have recently published a similar study in Transportation Research – Part D that focuses on eight cement mixers. These three studies include a combined
total of 35 vehicles that were tested for approximately one day on each of
the two fuels. In general, these
studies support the finding from dynamometer tests that substitution of B20
for petroleum diesel leads to reductions in tailpipe emissions of carbon
monoxide, hydrocarbons, and particulate matter. While there are differences in the effect
of B20 on the emissions of nitrogen oxides from one vehicle to another, on
average there was little change.
These studies also establish duty cycles for multiple types of
vehicles, including dump trucks, cement mixers, front-end loaders,
backhoes, and motor graders. The
newly measured duty cycles, coupled with modal emission rates obtained from
in-use measurements using Portable Emission Measurement Systems, enable
estimation of the effect of variations in vehicle operations on emissions.Dr. Frey and recent Ph.D. graduate Po-Yao Kuo have completed an assessment of avoided fuel use
and emissions for anti-idling methods for long-haul freight trucks, in
collaboration with the NC Solar Center and Volvo Technology of North
America. This assessment is based on
real world data from 20 instrumented trucks. See the November 6, 2008 press release, a video, and access the project final report. See also a recent presentation.
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Effective October 1, 2008, Dr. Frey will serve a
three-year term as one of the seven statutory members of the Clean Air Scientific Advisory Committee (CASAC) of the
U.S. Environmental Protection Agency (EPA).
See November 5, 2008 press release from NCSU’s College of Engineering.
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In August 2008, Dr. Frey was selected to serve on a
National Research Council committee that will assess methodology for
quantifying uncertainty in the health effects of air pollutants. See NCSU press release.
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Dr. Frey received an individual NC Mobile Clean Air and Renewable Energy (CARE) Award at the 2nd
Annual Mobile Clean Air and Renewable Energy (CARE) Symposium held in
Greensboro, NC on May 6, 2008.
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Dr. Frey is a recipient of a 2008 NCSU Alumni Association Outstanding Research Award
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Dr. Frey has been selected as a Fellow of the Air & Waste Management Association.
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Dr. Frey moderated a panel session on the new Energy Economy, sponsored by
the student group Net Impact and the NCSU College of Management. The session was held Friday, April 25, 2008 at 3:00 pm in 3400 Nelson Hall.
· Dr. Frey and his
students and colleagues delivered six presentations at the CRC On-Road
Vehicle Emissions Workshop, held on March 31-April 2. Topics include real world measurements of activity, fuel use, and
emissions of construction vehicles, modeling of construction vehicles, reducing idling fuel use and emissions of long-haul
freight trucks, real-world measurement of cement mixers and school
buses, as well as modeling of conventional and advanced vehicle
technologies and their impact on urban scale energy use and emissions.
· Dr. Frey delivered
the Chairman’s Air Pollution Seminar at the California Air Resources Board
in Sacramento, CA on January
9, 2008 on the topic of “Identification and Evaluation of
Potential Best Practices for Greenhouse Gas Reductions in Freight
Transportation.” The related final report is available,
“Best Practices Guidebook for Greenhouse Gas Reductions in Freight
Transportation.”
· Dr. Frey,
colleagues, and students delivered four presentations at the Transportation Research Board (TRB) Annual Meeting in Washington, DC
on January 15 and 16, 2008.
July 2008. Frey
Collaborates on Assessment of Plug-In Hybrid Electric
School Buses. See related story.
January 2007: Frey
Delivers Webinar on Reducing Greenhouse Gas Emissions from Freight
Transportation. See details at Federal Highway Administration Website.
August 2006. Frey
Begins 12 Month Assignment at U.S. Environmental Protection
Agency. Dr. H.
Christopher Frey began a 12 month sabbatical from NC State to the U.S. Environmental
Protection Agency on August
16, 2006 at the EPA’s National Exposure Research Laboratory
(NERL) in Research Triangle Park,
NC. While at NERL, Dr. Frey co-led an
agency-wide working group on the role of probabilistic risk assessment in
regulatory decision making and contributed to collaborative research with
EPA scientists on quantifying uncertainty in integrated modeling of air
pollutant emissions, air quality, human exposure
to air pollutant, and health effects.
Dr. Frey also participated in numerous other activities, such as
leading a working group at a November 2006 workshop on uncertainty in
models used to assess climate change.
December 2004:
Frey Elected President of the Society for Risk Analysis. Dr. Frey was elected to a three-year term
in 2004 to 2006 as President-Elect, President, and Past-President of the Society
for Risk Analysis. An international
multidisciplinary scholarly society, the Society for Risk Analysis provides
an open forum for researchers in the area of risk analysis, which includes
risk assessment, characterization, communication, management and
policymaking.
April 2004: Frey Appointed to EPA Scientific
Advisory Panel on Pesticides.
Dr. H. Christopher Frey was appointed to the US Environmental
Protection Agency’s Federal Insecticide, Fungicide and Rodenticide Act
(FIFRA) scientific advisory panel.
The panel serves as the primary scientific peer review mechanism for
the EPA Office of Prevention, Pesticides and Toxic Substances and provides
recommendations to the EPA concerning pesticide impact on health and the
environment. Frey, an internationally recognized expert in probabilistic
exposure assessment, was nominated for membership by the National
Institutes of Health and began his term on April 30, 2004. He continued on the panel until August 15, 2006.
November 1999:
Frey Receives SRA’s Chauncey Starr Award. Dr. H. Christopher Frey was selected to
receive the 1999 Chauncey Starr Award from the Society for Risk Analysis
(SRA). The award honors an individual under the age of 40 who has made
exceptional contributions to the field of risk analysis. The award is named
after Chauncey Starr, the founding president of the Electric Power Research
Institute, and a pioneer in the field of risk analysis. The Society of Risk
Analysis was established in 1980, with more than 2,000 members world-wide.
The award was presented at the SRA Annual Meeting in Atlanta, Georgia,
on December 7, 1999.
November 1999. Frey Participates in Sigma Xi “Risk Roundtable”
Symposium. See related story at Sigma Xi website.
October 1999: Frey Serves on IPCC Expert Working
Group. Dr. H. Christopher Frey
contributed to the development of the Best Practice Guidelines of the
National Greenhouse Gas Inventory Program of the Intergovermental
Panel on Climate Change (IPCC).
October 1999. Frey Invited to NAE Frontiers of
Engineering Symposium. Dr. H.
Christopher Frey was an invited participant in the National Academy of
Engineering’s (NAE’s) 5th Annual Symposium on Frontiers of
Engineering (FoE), held in Irvine,
California. Participants in FoE symposia are selected via a nomination process and
attendance is limited in order to encourage interaction among emerging leaders
in engineering.
October 1999. Frey and Colleagues Pioneer Research on
Real-World Vehicle Emissions. See related story.
June 1997: Frey Receives NSF CAREER Award. Dr. H. Christopher Frey of Raleigh received a
Faculty Early Career Development (CAREER) Award from the National Science
Foundation. The prestigious CAREER Award, which replaces the NSF Young
Investigator Award, recognizes and supports research by junior faculty. Frey used the award to support research
on, "New Methods for Systems Analysis of Environmental
Technologies." The research program focuses on pollution prevention
and involves development of engineering-economic models of clean
technologies and new technology analysis and optimization methods that deal
with uncertainty. Frey also will create detailed case studies to illustrate
the use of the new system models. "The goal is to achieve lower
emissions and minimize costs through better process design," said
Frey. "The research will also yield more realistic estimates of
technology capabilities, emissions and costs needed by industrial and
regional governmental planners in order to develop cost efficient air
quality management strategies."
November 1996: Frey Moderates Panel at Risk Conference. See related story at Duke University. See also Duke Law professor Jonathan Weiner’s paper on the topics
discussed.
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