Dr. Frey's interests are broadly in energy and environmental systems, including: modeling and evaluation of advanced energy conversion (e.g.,combustion, gasification) and environmental control systems; measurement and modeling of real-world fuel use and emissions of onroad and nonroad vehicles; development and application of methods for quantification of variability and uncertainty and for sensitivity analysis in systems models; and exposure and risk analysis

Works (190)

2019 | journal article

Comparison of real-world vehicle fuel use and tailpipe emissions for gasoline-ethanol fuel blends

FUEL, 249, 352–364.

By: W. Yuan, H. Frey, T. Wei, N. Rastogi, S. VanderGriend, D. Miller, L. Mattison

Sources: Web Of Science, ORCID
Added: May 6, 2019

2019 | journal article

Development of probabilistic emission inventories of air toxics for Jacksonville, Florida

Journal of the Air & Waste Management Association, 54(11), 1405–1421.

By: Y. Zhao & H. Frey

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2019 | journal article

Effect of Air-Conditioning on Light Duty Gasoline Vehicles Fuel Economy

TRANSPORTATION RESEARCH RECORD, 2673(5), 131–141.

By: T. Khan & H. Frey

Sources: Web Of Science, ORCID
Added: July 15, 2019

2019 | journal article

Indoor Exposure to Ambient Particles and Its Estimation Using Fixed Site Monitors

Environmental Science & Technology, 12(2), 808–819.

By: W. Che, H. Frey, Z. Li, X. Lao & A. Lau

Sources: NC State University Libraries, ORCID
Added: February 11, 2019

2019 | journal article

Quantification of Energy Saving Potential for A Passenger Train Based on Inter-Run Variability in Speed Trajectories

TRANSPORTATION RESEARCH RECORD, 2673(5), 153–165.

By: W. Yuan, H. Frey & N. Rastogi

Sources: Web Of Science, ORCID
Added: July 15, 2019

2018 | journal article

Comparison of real-world and certification emission rates for light duty gasoline vehicles

Science of The Total Environment, 622-623, 790–800.

By: T. Khan & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2018 | journal article

Dynamics of coarse and fine particle exposure in transport microenvironments

NPJ CLIMATE AND ATMOSPHERIC SCIENCE, 1.

By: P. Kumar, I. Rivas, A. Singh, V. Ganesh, M. Ananya & H. Frey

Sources: Web Of Science, ORCID
Added: June 4, 2019

2018 | journal article

Effect of Light Duty Vehicle Performance on a Driving Style Metric

TRANSPORTATION RESEARCH RECORD, 2672(25), 67–78.

By: S. Tanvir, H. Frey & N. Rouphail

Sources: Web Of Science, ORCID
Added: May 28, 2019

2018 | journal article

Real-world fuel use and gaseous emission rates for flex fuel vehicles operated on E85 versus gasoline

Journal of the Air & Waste Management Association, 12(3), 235–254.

By: M. Delavarrafiee & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2018 | journal article

Trends in on-road transportation, energy, and emissions

JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION, 68(10), 1015–1024.

By: S. Altshuler, A. Ayala, S. Collet, J. Chow, H. Frey, R. Shaikh, E. Stevenson, M. Walsh, J. Watson

Sources: NC State University Libraries, ORCID
Added: October 16, 2018

2018 | journal article

Trends in onroad transportation energy and emissions

Journal of the Air & Waste Management Association, 3(6), 514–563.

By: H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2017 | journal article

Characterization of PM 2.5 exposure concentration in transport microenvironments using portable monitors

Environmental Pollution, 228, 433–442.

By: Z. Li, W. Che, H. Frey, A. Lau & C. Lin

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2017 | journal article

Real-world freeway and ramp activity and emissions for light-duty gasoline vehicles

Transportation Research Record, (2627), 17–25.

By: H. Frey, M. Delavarrafiee & S. Singh

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2016 | journal article

Comparison of vehicle-specific fuel use and emissions models based on externally and internally observable activity data

Transportation Research Record, (2570), 30–38.

By: J. Hu, H. Frey & S. Washburn

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2016 | journal article

Dose-response models are conditional on determination of causality

Risk Analysis, 36(9), 1751–1754.

By: H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2016 | journal article

Effect of biodiesel fuels on real-world emissions of passenger locomotives

Environmental Science & Technology, 50(21), 12030–12039.

By: B. Graver, H. Frey & J. Hu

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2016 | journal article

Evaluation of light-duty gasoline vehicle rated fuel economy based on in-use measurements

Transportation Research Record, (2570), 21–29.

By: T. Khan & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2016 | journal article

Highway Vehicle Emissions Avoided by Diesel Passenger Rail Service Based on Real-World Data

Urban Rail Transit, 2(3-4), 153–171.

By: B. Graver & H. Frey

Source: ORCID
Added: April 26, 2019

2016 | journal article

Real-world activity, fuel use, and emissions of diesel side-loader refuse trucks

Atmospheric Environment, 129, 98–104.

By: G. Sandhu, H. Frey, S. Bartelt-Hunt & E. Jones

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2016 | journal article

Sequential measurement of intermodal variability in public transportation PM2.5 and CO exposure concentrations

Environmental Science & Technology, 50(16), 8760–8769.

By: W. Che, H. Frey & A. Lau

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2015 | journal article

Comparison of over-the-rail and rail yard measurements of diesel locomotives

Environmental Science & Technology, 49(21), 13031–13039.

By: B. Graver & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2015 | journal article

Comparison of sources of variability in school age children exposure to ambient PM2.5

Environmental Science & Technology, 49(3), 1511–1520.

By: W. Che, H. Frey & A. Lau

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2015 | journal article

In-use activity, fuel use, and emissions of heavy-duty diesel roll-off refuse trucks

Journal of the Air & Waste Management Association, 65(3), 306–323.

By: G. Sandhu, H. Frey, S. Bartelt-Hunt & E. Jones

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2015 | journal article

Integrating a simplified emission estimation model and mesoscopic dynamic traffic simulator to efficiently evaluate emission impacts of traffic management strategies

Transportation Research. Part D, Transport and Environment, 37, 123–136.

By: X. Zhou, S. Tanvir, H. Lei, J. Taylor, B. Liu, N. Rouphail, H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2015 | journal article

Measurement and evaluation of real-world speed and acceleration activity envelopes for light-duty vehicles

Transportation Research Record, (2503), 128–136.

By: B. Liu & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2015 | journal article

Simplified method for comparing emissions in roundabouts and at signalized intersections

Transportation Research Record, (2517), 48–60.

By: K. Salamati, N. Rouphail, H. Frey, B. Liu & B. Schroeder

Source: NC State University Libraries
Added: August 6, 2018

2015 | journal article

Variability in light-duty gasoline vehicle emission factors from trip-based real-world measurements

Environmental Science & Technology, 49(20), 12525–12534.

By: B. Liu & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2014 | journal article

Application of AIMSUN microsimulation model to estimate emissions on signalized arterial corridors

Transportation Research Record, (2428), 75–86.

By: A. Anya, N. Rouphail, H. Frey & B. Schroeder

Source: NC State University Libraries
Added: August 6, 2018

2014 | journal article

Assessment of the effect of population and diary sampling methods on estimation of school-age children exposure to fine particles

Risk Analysis, 34(12), 2066–2079.

By: W. Che, H. Frey & A. Lau

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2014 | journal article

Comparison of fine particulate matter and carbon monoxide exposure concentrations for selected transportation modes

Transportation Research Record, (2428), 54–62.

By: W. Jiao & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2014 | journal article

In-use measurement of the activity, fuel use, and emissions of front-loader refuse trucks

Atmospheric Environment, 92, 557–565.

By: G. Sandhu, H. Frey, S. Bartelt-Hunt & E. Jones

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2014 | journal article

Method for modeling driving cycles, fuel use, and emissions for over snow vehicles

Environmental Science & Technology, 48(14), 8258–8265.

By: J. Hu, H. Frey, G. Sandhu, B. Graver, G. Bishop, B. Schuchmann, J. Ray

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2014 | journal article

Road grade quantification based on global positioning system data obtained from real-world vehicle fuel use and emissions measurements

Atmospheric Environment, 85, 179–186.

By: B. Boroujeni & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2013 | journal article

Comparing exposure metrics for the effects of fine particulate matter on emergency hospital admissions

Journal of Exposure Science and Environmental Epidemiology, 23(6), 627–636.

By: E. Mannshardt, K. Sucic, W. Jiao, F. Dominici, H. Frey, B. Reich, M. Fuentes

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2013 | journal article

Comparison of locomotive emissions measured during dynamometer versus rail yard engine load tests

Transportation Research Record, (2341), 23–33.

By: B. Graver & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2013 | journal article

Effects of errors on vehicle emission rates from portable emissions measurement systems

Transportation Research Record, (2340), 10–19.

By: G. Sandhu & H. Frey

Source: NC State University Libraries
Added: August 6, 2018

2013 | journal article

Emissions estimation at multilane roundabouts effects of movement and approach lane

Transportation Research Record, (2389), 12–21.

By: K. Salamati, M. Coelho, P. Fernandes, N. Rouphail, H. Frey & J. Bandeira

Source: NC State University Libraries
Added: August 6, 2018

2013 | journal article

Engine and duty cycle variability in diesel construction equipment emissions

Journal of Environmental Engineering (United States), 139(2), 261–268.

By: S. Abolhasani & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2013 | journal article

Method for measuring the ratio of in-vehicle to near-vehicle exposure concentrations of airborne fine particles

Transportation Research Record, (2341), 34–42.

By: W. Jiao & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2013 | journal article

Road Grade Measurement Using In-Vehicle, Stand-Alone GPS with Barometric Altimeter

Journal of Transportation Engineering, 139(6), 605–611.

By: B. Boroujeni, H. Frey & G. Sandhu

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2012 | journal article

Assessment of inter-individual, geographic, and seasonal variability in estimated human exposure to fine particles

Environmental Science and Technology, 46(22), 12519–12526.

By: W. Jiao, H. Frey & Y. Cao

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2012 | journal article

Effects of engine idling on national ambient air quality standards criteria pollutant emissions from nonroad diesel construction equipment

Transportation Research Record, (2270), 67–75.

By: P. Lewis, W. Rasdorf, H. Frey & M. Leming

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2012 | journal article

Evaluation of On-Site Fuel Use and Emissions over the Duration of a Commercial Building Project

Journal of Infrastructure Systems, 18(2), 119–129.

By: W. Rasdorf, P. Lewis, S. Marshall, I. Arocho & H. Frey

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2012 | journal article

Evaluation of representativeness of site-specific fuel-based vehicle emission factors for route average emissions

Environmental Science and Technology, 46(12), 6867–6873.

By: T. Lee & H. Frey

Source: ORCID
Added: April 26, 2019

2012 | journal article

Methodology for estimating emissions inventories for commercial building projects

Journal of Architectural Engineering, 18(3), 251–260.

By: S. Marshall, W. Rasdorf, P. Lewis & H. Frey

Source: ORCID
Added: April 26, 2019

2012 | journal article

Modeling of Human Exposure to In-Vehicle PM2.5 from Environmental Tobacco Smoke

Human and Ecological Risk Assessment, 18(3), 608–626.

By: Y. Cao & H. Frey

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2012 | journal article

Portable emission measurement system for emissions of passenger rail locomotives

Transportation Research Record, (2289), 56–63.

By: H. Frey, H. Choi & K. Kim

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2012 | journal article

Real-world measurement and evaluation of duty cycles, fuels, and emission control technologies of heavy-duty trucks

Transportation Research Record, (2270), 180–187.

By: G. Sandhu & H. Frey

Source: NC State University Libraries
Added: August 6, 2018

2012 | journal article

Time series analysis of personal exposure to ambient air pollution and mortality using an exposure simulator

Journal of Exposure Science and Environmental Epidemiology, 22(5), 483–488.

By: H. Chang, M. Fuentes & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2011 | journal article

Assessing effects of operational efficiency on pollutant emissions of nonroad diesel construction equipment

Transportation Research Record, (2233), 11–18.

By: P. Lewis, M. Leming, H. Frey & W. Rasdorf

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2011 | journal article

Assessment of Interindividual and Geographic Variability in Human Exposure to Fine Particulate Matter in Environmental Tobacco Smoke

Risk Analysis, 31(4), 578–591.

By: Y. Cao & H. Frey

Source: ORCID
Added: April 26, 2019

2011 | journal article

Comparison of driving schedule project level MOVES emission factors to empirical data

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 3, 2445–2454.

By: B. Liu & H. Frey

Source: ORCID
Added: April 26, 2019

2011 | journal article

Comparison of real-world activity, fuel use, and emissions for selected light duty gasoline vehicles based on driving cycles

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 1, 600–607.

By: Y. Sun & H. Frey

Source: ORCID
Added: April 26, 2019

2011 | journal article

Fuel use and emission rates for F59PH locomotive engines tested on an engine dynamometer

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 1, 614–619.

By: B. Graver & H. Frey

Source: ORCID
Added: April 26, 2019

2011 | journal article

Geographic differences in inter-individual variability of human exposure to fine particulate matter

Atmospheric Environment, 45(32), 5684–5691.

By: Y. Cao & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2011 | journal article

In-use measurement of activity, energy use, and emissions of a plug-in hybrid electric vehicle

Environmental Science and Technology, 45(20), 9044–9051.

By: B. Graver, H. Frey & H. Choi

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2011 | journal article

Incorporating vehicle portable emissions measurement systems into the classroom

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 1, 620–637.

By: H. Frey, G. Sandhu, Y. Sun, T. Lee, H. Swidan, B. Liu, S. Babaee

Source: ORCID
Added: April 26, 2019

2011 | journal article

Modeling of hybrid and plug-in hybrid electric vehicle energy use and emissions based on in-use measurement

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 1, 608–613.

By: B. Graver & H. Frey

Source: ORCID
Added: April 26, 2019

2011 | journal article

Modeling of in-vehicle human exposure to ambient fine particulate matter

Atmospheric Environment, 45(27), 4745–4752.

By: X. Liu & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2011 | journal article

Variability in gram per gallon vehicle emission factors with engine load and among driving cycles

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 3, 2335–2341.

By: T. Lee & H. Frey

Source: ORCID
Added: April 26, 2019

2010 | journal article

Comparative assessment of passenger railroad locomotives using portable emission measurement systems

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 7, 5249–5255.

By: H. Frey, H. Choi, B. Graver & G. Sandhu

Source: ORCID
Added: April 26, 2019

2010 | journal article

Comprehensive field study of fuel use and emissions of nonroad diesel construction equipment

Transportation Research Record, (2158), 69–76.

By: H. Frey, W. Rasdorf & P. Lewis

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2010 | journal article

Estimating diesel vehicle emission factors at constant and high speeds for short road segments

Transportation Research Record, (2158), 19–27.

By: H. Choi & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2010 | journal article

Estimating in-vehicle concentration of and exposure to fine particulate matter: Near-roadway ambient air quality and variability in vehicle operation

Transportation Research Record, (2158), 105–112.

By: X. Liu, H. Frey & Y. Cao

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2010 | conference paper

Estimating productivity-based fuel eifficiency and emissions factors of diesel construction equipment performing earthmoving activities

In N. M. B. Chimay J. Anumba, John Messner, & M. K. Parfitt (Eds.), Proceedings of the 6th International Conference on Innovation in Architecture, Engineering, and Construction. University Park, Pa. : Department of Architectural Engineering, Pennsylvania State University.

By: W. Rasdorf, P. Lewis & H. Frey

Ed(s): N. Chimay J. Anumba, . John Messner & M. Parfitt

Source: NC State University Libraries
Added: August 6, 2018

2010 | journal article

Field procedures for real-world measurements of emissions from diesel construction vehicles

Journal of Infrastructure Systems, 16(3), 216–225.

By: W. Rasdorf, C. Frey, P. Lewis, K. Kim, S. Pang & S. Abolhassani

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2010 | journal article

Measurement and comparison of locomotive engine emissions

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 7, 5272–5280.

By: H. Frey, H. Choi, B. Graver & G. Sandhu

Source: ORCID
Added: April 26, 2019

2010 | journal article

Method for in-use measurement and evaluation of the activity, fuel use, electricity use, and emissions of a plug-in hybrid diesel-electric school bus

Environmental Science and Technology, 44(9), 3601–3607.

By: H. Choi & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2010 | journal article

Quantifying the microscale activity, energy use, and emissions of a plug-in hybrid electric vehicle based on in-use data

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 1, 23–45.

By: B. Graver & H. Frey

Source: ORCID
Added: April 26, 2019

2010 | journal article

Vehicle-specific emissions modeling based upon on-road measurements

Environmental Science and Technology, 44(9), 3594–3600.

By: H. Frey, K. Zhang & N. Rouphail

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

A risk-based assessment and management framework for multipollutant air quality

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 2, 1068–1080.

By: H. Frey & B. Hubbell

Source: ORCID
Added: April 26, 2019

2009 | journal article

Analysis of coupled model uncertainties in source-to-dose modeling of human exposures to ambient air pollution: A PM2.5 case study

Atmospheric Environment, 43(9), 1641–1649.

By: H. Özkaynak, H. Frey, J. Burke & R. Pinder

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Assessing methods for comparing emissions from gasoline and diesel light-duty vehicles based on microscale measurements

Transportation Research Part D: Transport and Environment, 14(2), 91–99.

By: M. Coelho, H. Frey, N. Rouphail, H. Zhai & L. Pelkmans

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Comparison of flexible fuel vehicle and life-cycle fuel consumption and emissions of selected pollutants and greenhouse gases for ethanol 85 versus gasoline

Journal of the Air and Waste Management Association, 59(8), 912–924.

By: H. Zhai, H. Frey, N. Rouphail, G. Gonçalves & T. Farias

Source: ORCID
Added: April 26, 2019

2009 | journal article

Development and use of emissions inventories for construction vehicles

Transportation Research Record, (2123), 46–53.

By: P. Lewis, H. Frey & W. Rasdorf

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Effects of idle reduction technologies on real world fuel use and exhaust emissions of idling long-haul trucks

Environmental Science and Technology, 43(17), 6875–6881.

By: H. Frey, P. Kuo & C. Villa

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Estimation of air carrier emissions at Raleigh-Durham international airport

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 4, 2502–2516.

By: B. Graver & H. Frey

Source: ORCID
Added: April 26, 2019

2009 | journal article

In-use measurement of the activity, energy use, and emissions of a plug-in hybrid electric vehicle

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 2, 1127–1144.

By: H. Frey, H. Choi, E. Pritchard & J. Lawrence

Source: ORCID
Added: April 26, 2019

2009 | journal article

In-use measurement of the activity, fuel use, and emissions of eight cement mixer trucks operated on each of petroleum diesel and soy-based B20 biodiesel

Transportation Research Part D: Transport and Environment, 14(8), 585–592.

By: H. Frey & K. Kim

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Life cycle inventory energy consumption and emissions for biodiesel versus petroleum diesel fueled construction vehicles

Environmental Science & Technology, 43(16), 6398–6405.

By: S. Pang, H. Frey & W. Rasdorf

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Life cycle inventory energy consumption and emissions for biodiesel versus petroleum diesel fueled construction vehicles

Environmental Science and Technology, 43(16), 6398–6405.

By: S. Pang, H. Frey & W. Rasdorf

Source: ORCID
Added: April 26, 2019

2009 | journal article

Light duty gasoline vehicle emission factors at high transient and constant speeds for short road segments

Transportation Research. Part D, Transport and Environment, 14(8), 610–614.

By: H. Choi & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Measurement of the energy use and emissions of passenger rail locomotives using a portable emission measurement system

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 2, 1145–1157.

By: H. Frey, H. Choi & K. Kim

Source: ORCID
Added: April 26, 2019

2009 | journal article

Modeling of in-vehicle PM2.5 exposure using the stochastic human exposure and dose simulation model

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 2, 1087–1100.

By: X. Liu, H. Frey, Y. Cao & B. Deshpande

Source: ORCID
Added: April 26, 2019

2009 | journal article

Probabilistic exposure analysis for chemical risk characterization

Toxicological Sciences, 109(1), 4–17.

By: K. Bogen, A. Cullen, H. Frey & P. Price

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Real-world energy use and emission rates for idling long-haul trucks and selected idle reduction technologies

Journal of the Air and Waste Management Association, 59(7), 857–864.

By: H. Frey & P. Kuo

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Regional on-road vehicle running emissions modeling and evaluation for conventional and alternative vehicle technologies

Environmental Science and Technology, 43(21), 8449–8455.

By: H. Frey, H. Zhai & N. Rouphail

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2009 | journal article

Requirements and incentives for reducing construction vehicle emissions and comparison of nonroad diesel engine emissions data sources

Journal of Construction Engineering and Management, 135(5), 341–351.

By: P. Lewis, W. Rasdorf, H. Frey, S. Pang & K. Kim

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2008 | journal article

A vehicle-specific power approach to speed- and facility-specific emissions estimates for diesel transit buses

Environmental Science and Technology, 42(21), 7985–7991.

By: H. Zhai, H. Frey & N. Rouphail

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2008 | journal article

Characterization of real-world activity, fuel use, and emissions for selected motor graders fueled with petroleum diesel and B20 biodiesel

Journal of the Air and Waste Management Association, 58(10), 1274–1287.

By: H. Frey, K. Kim, S. Pang, W. Rasdorf & P. Lewis

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2008 | journal article

Characterizing variability and uncertainty in exposure assessments improves links to environmental decision-making

EM: Air and Waste Management Association's Magazine for Environmental Managers, (JULY), 18–22.

By: H. Özkaynak, H. Frey & B. Hubbell

Source: ORCID
Added: April 26, 2019

2008 | journal article

Comparison of fuel consumption and tailpipe emissions of ethanol 85 and gasoline for flexible fuel vehicles

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 5, 3262–3276.

By: H. Zhai, H. Frey, N. Rouphail, G. Gonçalves & T. Farias

Source: ORCID
Added: April 26, 2019

2008 | journal article

Comparison of real-world emissions of B20 biodiesel versus petroleum diesel for selected IMonroad vehicles and engine tiers

Transportation Research Record, (2058), 33–42.

By: H. Frey, W. Rasdorf, K. Kim, S. Pang & P. Lewis

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2008 | journal article

Estimating light duty gasoline vehicle emission factors at high transient and constant speeds for short road segments to support near-roadway air quality studies

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 5, 3137–3148.

By: H. Frey & H. Choi

Source: ORCID
Added: April 26, 2019

2008 | journal article

Evaluation of response time of a portable system for in-use vehicle tailpipe emissions measurement

Environmental Science and Technology, 42(1), 221–227.

By: K. Zhang & C. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2008 | journal article

Fuel use and emissions comparisons for alternative routes, time of day, road grade, and vehicles based on in-use measurements

Environmental Science and Technology, 42(7), 2483–2489.

By: H. Frey, K. Zhang & N. Rouphail

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2008 | journal article

Impact of alternative vehicle technologies on measured vehicle emissions

Transportation Land Use, Planning, and Air Quality - Proceedings of the 2007 Transportation Land Use, Planning, and Air Quality Conference, 320.

By: H. Zhai, H. Frey, N. Rouphail, G. Gonçalves & T. Farias

Source: ORCID
Added: April 26, 2019

2008 | journal article

Link-based emission factors for heavy-duty diesel trucks based on real-world data

Transportation Research Record, (2058), 23–32.

By: H. Frey, N. Rouphail & H. Zhai

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2008 | journal article

Measurement and modeling of fuel use and exhaust emissions from idling Long-haul freight truck and auxiliary power unit engines

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 5, 3060–3064.

By: H. Frey, P. Kuo & C. Villa

Source: ORCID
Added: April 26, 2019

2008 | journal article

Methodology for characterization of long-haul truck idling activity under real-world conditions

Transportation Research Part D: Transport and Environment, 13(8), 516–523.

By: H. Frey, P. Kuo & C. Villa

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2008 | report

Real-world duty cycles and utilization for construction equipment in North Carolina

Technical Report- Not held in TRLN member libraries. Raleigh, N.C.: North Carolina Department of Transportation.

By: H. Frey, W. Rasdorf, K. Kim, S. Pang, P. Lewis & S. Abolhassani

Source: NC State University Libraries
Added: August 6, 2018

2008 | journal article

Real-world in-use activity, fuel use, and emissions for nonroad construction vehicles: A case study for excavators

Journal of the Air and Waste Management Association, 58(8), 1033–1046.

By: S. Abolhasani, H. Frey, K. Kim, W. Rasdorf, P. Lewis & S. Pang

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2008 | journal article

Vehicle-specific emissions modeling for non-road construction vehicles based upon real-world measurements

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 5, 2743–2749.

By: H. Frey, S. Pang & K. Kim

Source: ORCID
Added: April 26, 2019

2008 | journal article

What is uncertainty analysis and how can it be performed?

Toxicology Letters, 180, 3.

By: H. Frey

Source: ORCID
Added: April 26, 2019

2007 | journal article

Comparing real-world fuel consumption for diesel- and hydrogen-fueled transit buses and implication for emissions

Transportation Research Part D: Transport and Environment, 12(4), 281–291.

By: H. Frey, N. Rouphail, H. Zhai, T. Farias & G. Gonçalves

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2007 | journal article

Fuel consumption and emissions comparisons between ethanol 85 and gasoline fuels for flexible fuel vehicles

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 5, 3104–3108.

By: H. Zhai, H. Frey, N. Rouphail, G. Gonçalves & T. Farias

Source: ORCID
Added: April 26, 2019

2007 | report

Life cycle inventory and impact analysis framework for nonroad construction vehicles and equipment based upon in-use measurements

Technical Report- Not held in TRLN member libraries. Raleigh, N.C.: National Science Foundation.

By: H. Frey, W. Rasdorf, K. Kim, S. Pang, P. Lewis & S. Abolhassani

Source: NC State University Libraries
Added: August 6, 2018

2007 | conference paper

Methodology for activity, fuel use, and emissions data collection and analysis for nonroad construction equipment

In Proceedings of the Air and Waste Management Association Annual Conference. Pittsburgh, PA: AWMA.

By: H. Frey, W. Rasdorf, S. Pang, K. Kim, S. Abolhasani & P. Lewis

Source: NC State University Libraries
Added: August 6, 2018

2007 | journal article

Methodology for activity, fuel use, and emissions data collection and analysis for nonroad construction equipment

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 5, 3124–3128.

By: H. Frey, W. Rasdorf, S. Pang, K. Kim, S. Abolhasani & P. Lewis

Source: ORCID
Added: April 26, 2019

2007 | conference paper

Methods for measurement and analysis of in-use emissions of nonroad construction equipment

In Proceedings of the EPA Emissions Inventory Conference. Raleigh, NC: EPA.

By: H. Frey, W. Rasdorf, S. Pang, K. Kim & P. Lewis

Source: NC State University Libraries
Added: August 6, 2018

2007 | journal article

Potential best practices for reducing greenhouse gas (GHG) emissions in freight transportation

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 5, 3099–3103.

By: H. Frey & P. Kuo

Source: ORCID
Added: April 26, 2019

2007 | journal article

Second-order modeling of variability and uncertainty in microbial hazard characterization

Journal of Food Protection, 70(2), 363–372.

By: A. Vicari, A. Mokhtari, R. Morales, L. Jaykus, H. Frey, B. Slenning, P. Cowen

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2007 | journal article

Simplified performance model of gas turbine combined cycle systems

Journal of Energy Engineering, 133(2), 82–90.

By: Y. Zhu & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2007 | journal article

Spatial and temporal analysis of real-world empirical fuel use and emissions

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 3, 2097–2102.

By: H. Frey & K. Zhang

Source: ORCID
Added: April 26, 2019

2006 | journal article

Air emission inventories in North America: A critical assessment

Journal of the Air and Waste Management Association, 56(8), 1115–1129.

By: C. Miller, G. Hidy, J. Hales, C. Kolb, A. Werner, B. Haneke, D. Parrish, H. Frey ...

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2006 | journal article

Application of classification and regression trees for sensitivity analysis of the Escherichia coli O157:H7 food safety process risk model

Journal of Food Protection, 69(3), 609–618.

By: A. Mokhtari, H. Frey & L. Jaykus

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2006 | journal article

Emissions comparison between dirt roads and paved roads using portable emissions measurement systems

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 6, 3421–3439.

By: J. Zietsman, D. Perkinson, H. Frey & K. Wieters

Source: ORCID
Added: April 26, 2019

2006 | journal article

Evaluation and recommendation of sensitivity analysis methods for application to stochastic human exposure and dose simulation models

Journal of Exposure Science and Environmental Epidemiology, 16(6), 491–506.

By: A. Mokhtari, H. Frey & J. Zheng

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2006 | journal article

Evaluation of numerical models for simulation of real-world hot-stabilized fuel consumption and emissions of gasoline light-duty vehicles

Transportation Research Part D: Transport and Environment, 11(5), 377–385.

By: C. Silva, T. Farias, H. Frey & N. Rouphail

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2006 | journal article

Evaluation of sampling-based methods for sensitivity analysis: Case study for the E. coli food safety process risk model

Human and Ecological Risk Assessment, 12(6), 1128–1152.

By: A. Mokhtari & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2006 | journal article

Improved system integration for integrated gasification combined cycle (IGCC) systems

Environmental Science and Technology, 40(5), 1693–1699.

By: H. Frey & Y. Zhu

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2006 | journal article

Real-world data collection procedure for non-road construction equipment: Problems, solutions, and data quality assurance

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 3, 1935–1939.

By: K. Kim, S. Abolhasani, S. Pang & H. Frey

Source: ORCID
Added: April 26, 2019

2006 | journal article

Road grade estimation for on-road vehicle emissions modeling using light detection and ranging data

Journal of the Air and Waste Management Association, 56(6), 777–788.

By: K. Zhang & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2006 | journal article

Uncertainty analysis of integrated gasification combined cycle systems based on frame 7H versus 7F gas turbines

Journal of the Air and Waste Management Association, 56(12), 1649–1661.

By: Y. Zhu & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2006 | journal article

Uncertainty for data with non-detects: Air toxic emissions from combustion

Human and Ecological Risk Assessment, 12(6), 1171–1191.

By: Y. Zhao & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2005 | journal article

In-use emissions of heavy duty diesel dump trucks on petroleum diesel and B20 biodiesel fuels

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 2005.

By: H. Frey & K. Kim

Source: ORCID
Added: April 26, 2019

2005 | journal article

Quantitative analysis of variability and uncertainty with known measurement error: Methodology and case study

Risk Analysis, 25(3), 663–675.

By: J. Zheng & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2005 | journal article

Recommended practice regarding selection of sensitivity analysis methods applied to microbial food safety process risk models

Human and Ecological Risk Assessment, 11(3), 591–605.

By: A. Mokhtari & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2005 | journal article

Road grade estimation for on-road vehicle emissions modeling using lidar data

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 2005.

By: K. Zhang & C. Frey

Source: ORCID
Added: April 26, 2019

2005 | journal article

Sensitivity analysis of a two-dimensional probabilistic risk assessment model using analysis of variance

Risk Analysis, 25(6), 1511–1529.

By: A. Mokhtari & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2004 | journal article

A Monte Carlo study of the uncertainties in predictions by ISC3ST and AERMOD of annual average benzene and 1,3-butadiene concentrations around the Houston Ship Channel

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA, 3145–3157.

By: S. Hanna, D. Heinold, R. Paine, H. Frey, D. Baker, R. Karp, H. Feldman

Source: ORCID
Added: April 26, 2019

2004 | journal article

Assessment of uncertainty in benzene concentration estimates in the Houston, TX, area

Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA.

By: A. Hanna, J. Vukovich, S. Arunachalam, D. Loughlin, H. Frey & V. Isakov

Source: ORCID
Added: April 26, 2019

2004 | journal article

Comparison of sensitivity analysis methods based on applications to a food safety risk assessment model

Risk Analysis, 24(3), 573–585.

By: S. Patil & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2004 | journal article

Development of probabilistic emission inventories of air toxics for Jacksonville, Florida

Journal of the Air and Waste Management Association, 54(11), 1405–1421.

By: Y. Zhao & H. Frey

Source: ORCID
Added: April 26, 2019

2004 | journal article

Optimization under variability and uncertainty: A case study for NO x emissions control for a gasification system

Environmental Science and Technology, 38(24), 6741–6747.

By: J. Chen & H. Frey

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2004 | journal article

Propagation of Uncertainty in Hourly Utility NOx Emissions through a Photochemical Grid Air Quality Model: A Case Study for the Charlotte, NC, Modeling Domain

Environmental Science and Technology, 38(7), 2153–2160.

By: A. Abdel-Aziz & H. Frey

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2004 | journal article

Quantification of Highway Vehicle Emissions Hot Spots Based upon On-Board Measurements

Journal of the Air and Waste Management Association, 54(2), 130–140.

By: A. Unal, H. Frey & N. Rouphail

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2004 | journal article

Quantification of variability and uncertainty for air toxic emission inventories with censored emission factor data

Environmental Science and Technology, 38(22), 6094–6100.

By: H. Frey & Y. Zhao

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2004 | journal article

Quantification of variability and uncertainty for censored data sets and application to air toxic emission factors

Risk Analysis, 24(4), 1019–1034.

By: Y. Zhao & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2004 | journal article

Quantification of variability and uncertainty using mixture distributions: Evaluations of sample size, mixing weights, and separation between components

Risk Analysis, 24(3), 553–571.

By: J. Zheng & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2003 | journal article

Development of hourly probabilistic utility NOx emission inventories using time series techniques: Part I - Univariate approach

Atmospheric Environment, 37(38), 5379–5389.

By: A. Abdel-Aziz & H. Frey

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2003 | journal article

Development of hourly probabilistic utility NOx emission inventories using time series techniques: Part II - Multivariate approach

Atmospheric Environment, 37(38), 5391–5401.

By: A. Abdel-Aziz & H. Frey

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2003 | chapter

Effect of arterial signalization and level of service on measured vehicle emissions

In Energy, air quality, and fuels 2003 (pp. 47–56). Washington, DC: Transportation Research Board.

By: A. Unal, N. Rouphail & H. Frey

Source: NC State University Libraries
Added: August 6, 2018

2003 | journal article

Effect of arterial signalization and level of service on measured vehicle emissions

Transportation Research Record, (1842), 47–56.

By: A. Unal, N. Rouphail & C. Frey

Source: ORCID
Added: April 26, 2019

2003 | journal article

Methods for Quantifying Variability and Uncertainty in AP-42 Emission Factors: Case Studies for Natural Gas-Fueled Engines

Journal of the Air and Waste Management Association, 53(12), 1436–1447.

By: H. Frey & S. Li

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2003 | journal article

On-road measurement of vehicle tailpipe emissions using a portable instrument

Journal of the Air and Waste Management Association, 53(8), 992–1002.

By: H. Frey, A. Unal, N. Rouphail & J. Colyar

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2003 | journal article

Probabilistic nonroad mobile source emission factors

Journal of Environmental Engineering, 129(2), 162–168.

By: H. Frey & S. Bammi

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2003 | journal article

Quantification of Hourly Variability in NOx Emissions for Baseload Coal-Fired Power Plants

Journal of the Air and Waste Management Association, 53(11), 1401–1411.

By: A. Abdel-Aziz & H. Frey

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

2002 | journal article

Identification and review of sensitivity analysis methods

Risk Analysis, 22(3), 553–578.

By: H. Frey & S. Patil

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2002 | journal article

Introduction to special section on sensitivity analysis and summary of NCSU/USDA workshop on sensitivity analysis

Risk Analysis, 22(3), 539–545.

By: H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2002 | journal article

Probabilistic analysis of driving cycle-based highway vehicle emission factors

Environmental Science and Technology, 36(23), 5184–5191.

By: H. Frey & J. Zheng

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2002 | journal article

Quantification of variability and uncertainty in air pollutant emission inventories: Method and case study for utility NOx emissions

Journal of the Air and Waste Management Association, 52(9), 1083–1095.

By: H. Frey & J. Zheng

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2002 | journal article

Quantification of variability and uncertainty in lawn and garden equipment NOx and total hydrocarbon emission factors

Journal of the Air and Waste Management Association, 52(4), 435–448.

By: H. Frey & S. Bammi

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2001 | journal article

Uncertainties in predicted ozone concentrations due to input uncertainties for the UAM-V photochemical grid model applied to the July 1995 OTAG domain

Atmospheric Environment, 35(5), 891–903.

By: S. Hanna, Z. Lu, H. Frey, N. Wheeler, J. Vukovich, S. Arunachalam, M. Fernau, D. Hansen

Sources: ORCID, NC State University Libraries
Added: August 6, 2018

1999 | journal article

Methods for characterizing variability and uncertainty: Comparison of bootstrap simulation and likelihood-based approaches

Risk Analysis, 19(1), 109–130.

By: H. Frey & D. Burmaster

Source: ORCID
Added: April 26, 2019

1999 | journal article

Methods for characterizing variability and uncertainty: Comparison of bootstrap simulation and likelihood-based approaches

Risk Analysis, 19(1), 109–130.

By: H. Frey & D. Burmaster

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

1998 | journal article

Characterization and simulation of uncertain frequency distributions: Effects of distribution choice, variability, uncertainty, and parameter dependence

Human and Ecological Risk Assessment, 4(2), 423–468.

By: H. Frey & D. Rhodes

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

1998 | conference paper

Desktop modeling of the performance, emissions, and cost of gasification systems

In Proceedings of the Air & Waste Management Association's, 91th Annual Meeting & Exhibition: San Diego, California, June 14-18, 1998 (Vol. 91). Pittsburgh, PA :; A & WMA.

By: H. Frey & R. Bharvirkar

Source: NC State University Libraries
Added: August 6, 2018

1998 | journal article

Desktop modeling of the performance, emissions, and cost of gasification systems

Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition.

By: H. Frey & R. Bharvirkar

Source: ORCID
Added: April 26, 2019

1998 | conference paper

Methods for quantitative analysis of variability and uncertainty in hazardous air pollutant emissions

In Proceedings of the Air & Waste Management Association's, 91th Annual Meeting & Exhibition: San Diego, California, June 14-18, 1998 (Vol. 91). Pittsburgh, PA :; A & WMA.

By: H. Frey

Source: NC State University Libraries
Added: August 6, 2018

1998 | journal article

Methods for quantitative analysis of variability and uncertainty in hazardous air pollutant emissions

Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition.

By: H. Frey

Source: ORCID
Added: April 26, 2019

1998 | chapter

Quantitative analysis of variability and uncertainty in energy and environmental systems

In Uncertainty modeling and analysis in civil engineering (pp. 381–423). Boca Raton: CRC Press.

By: H. Frey

Source: NC State University Libraries
Added: August 6, 2018

1997 | journal article

Bootstrap methods for quantitative analysis of variability and uncertainty in exposure and risk assessment

Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition.

By: H. Frey

Source: ORCID
Added: April 26, 2019

1997 | journal article

Integrated environmental control modeling of coal-fired power systems

Journal of the Air and Waste Management Association, 47(11), 1180–1188.

By: E. Rubin, J. Kalagnanam, H. Frey & M. Berkenpas

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

1997 | conference paper

Methods for characterizing and managing technological risks in advanced power generation systems: Application to gasification repowering in Poland

In Proceedings of Gasification Technologies Conference, Electric Power Research lnstitute, Palo Alto, CA. October 1997.

By: H. Frey & Z. Iwanski

Source: NC State University Libraries
Added: August 6, 2018

1997 | journal article

Modeling and evaluation of externally fired combined cycle using ASPEN

Journal of Energy Engineering, 123(3), 69–87.

By: P. Agarwal & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

1997 | journal article

Modeling and evaluation of externally fired combined cycle using ASPEN

Journal of Energy Engineering, 123(3), 69–86.

By: P. Agrawal & H. Frey

Source: ORCID
Added: April 26, 2019

1997 | journal article

Optimal design of advanced power systems under uncertainty

Energy Conversion and Management, 38(15-17), 1725–1735.

By: U. Diwekar, E. Rubin & H. Frey

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

1997 | book

Probabilistic evaluation of mobile source air pollution. Volume I, Probabilistic modeling of exhaust emissions from light duty gasoline vehicles

Raleigh, NC: North Carolina State University for Center for Transportation and the Environment.

By: M. Kini & H. Frey

Source: NC State University Libraries
Added: August 6, 2018

1997 | conference paper

Probabilistic methodology for risk assessment of new energy technologies and application to gasification repowering for an oil refinery in Poland

In Florence World Energy Research Symposium (1997): FLOWERS ''97: Florence World Energy Symposium (Vol. 39, pp. 267–274). Padova, Italy: SGEditorial.

By: H. Frey & Z. Iwanski

Source: NC State University Libraries
Added: August 6, 2018

1997 | journal article

Quantification of uncertainty in remotesensing-based school bus CO and hydrocarbon emission factors

Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition.

By: H. Frey

Source: ORCID
Added: April 26, 2019

1997 | conference paper

Quantification of variability and uncertainty in AP-42 emission factors using bootstrap simulation

In Emission inventory: Planning for the future, proceedings of a specialty conference, October 28-30, 1997, Research Triangle Park, NC. Pittsburgh, Pa.: Air & Waste Management Association.

By: D. Rhodes & H. Frey

Source: NC State University Libraries
Added: August 6, 2018

1997 | chapter

Uncertainty evaluation in capital cost projection

In Encyclopedia of chemical processing and design, Vol. 59 (Vol. 59, pp. 480–494). New York: Marcel Dekker.

By: H. Frey & E. Rubin

Source: NC State University Libraries
Added: August 6, 2018

1997 | conference paper

Variability and uncertainty in highway vehicle emission factors

In Emission inventory: Planning for the future, proceedings of a specialty conference, October 28-30, 1997, Research Triangle Park, NC. Pittsburgh, Pa.: Air & Waste Management Association.

By: H. Frey

Source: NC State University Libraries
Added: August 6, 2018

1996 | journal article

Characterizing, simulating, and analyzing variability and uncertainty: An illustration of methods using an air toxics emissions example

Human and Ecological Risk Assessment (HERA), 2(4), 762–797.

By: H. Frey & D. Rhodes

Source: ORCID
Added: April 26, 2019

1996 | journal article

Methods for evaluating the costs of utility NOx control technologies

Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition.

By: L. Tran & H. Frey

Source: ORCID
Added: April 26, 2019

1996 | journal article

Optimization of environmental control system design for an IGCC power plant

Proceedings of the American Power Conference, 1, 58–63.

By: U. Diwekar, E. Rubin & H. Frey

Source: ORCID
Added: April 26, 2019

1996 | journal article

Probabilistic analysis and optimization of new power generation technologies: a case study for the externally-fired combined cycle

Proceedings of the American Power Conference, 1, 52–57.

By: H. Frey & P. Agarwal

Source: ORCID
Added: April 26, 2019

1996 | journal article

Probabilistic modeling and optimization of clean coal technologies: case studies of the externally-fired combined cycle

Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition.

By: H. Frey & P. Agarwal

Source: ORCID
Added: April 26, 2019

1996 | journal article

Uncertainty, bias, and variability in emission factors for light duty gasoline vehicles

Proceedings of the Air & Waste Management Association's Annual Meeting & Exhibition.

By: H. Frey, M. Kini, S. Ranjithan & S. Fu

Source: ORCID
Added: April 26, 2019

1995 | journal article

Coal blending optimization under uncertainty

European Journal of Operational Research, 83(3), 452–465.

By: J. Shih & H. Frey

Source: ORCID
Added: April 26, 2019

1995 | journal article

Engineering-economic evaluation of SCR NOx control systems for coal-fired power plants

Proceedings of the American Power Conference, 57-2, 1583–1588.

By: H. Frey

Source: ORCID
Added: April 26, 2019

1994 | journal article

Modeling uncertainties in advanced technologies: Application to a coal gasification system with hot-gas cleanup

Energy, 19(4), 449–463.

By: H. Frey, E. Rubin & U. Diwekar

Source: ORCID
Added: April 26, 2019

1992 | journal article

Evaluate uncertainties in advanced process technologies

Chemical Engineering Progress, 88(5), 63–70.

By: H. Frey & E. Rubin

Source: ORCID
Added: April 26, 2019

1992 | journal article

Evaluation method for advanced acid rain compliance technology

Journal of Energy Engineering, 118(1), 38–55.

By: H. Frey & E. Rubin

Source: ORCID
Added: April 26, 2019

1992 | journal article

Evaluation of advanced coal gasification combined-cycle systems under uncertainty

Industrial and Engineering Chemistry Research, 31(5), 1299–1307.

By: C. Frey & E. Rubin

Source: ORCID
Added: April 26, 2019

1992 | journal article

Synthesizing optimal flowsheets. Applications to IGCC system environmental control

Industrial and Engineering Chemistry Research, 31(8), 1927–1936.

By: U. Diwekar, C. Frey & E. Rubin

Source: ORCID
Added: April 26, 2019

1991 | journal article

Evaluating advanced technologies for acid rain compliance

Energy in the 90's, 172–178.

By: H. Frey & E. Rubin

Source: ORCID
Added: April 26, 2019

1991 | journal article

Probabilistic evaluation of advanced SO2/NO(x) control technology

Journal of the Air and Waste Management Association, 41(12), 1585–1593.

By: H. Frey & E. Rubin

Source: ORCID
Added: April 26, 2019

1991 | journal article

Probabilistic modeling of the performance and economics of IGCC systems

American Society of Mechanical Engineers, Environmental Control Division Publication, EC, 2, 59–66.

By: E. Rubin, H. Frey & U. Diwekar

Source: ORCID
Added: April 26, 2019

Employment

North Carolina State University Raleigh, NC
Distinguished University Professor, Civil, Construction, and Environmental Engineering

Education

Carnegie Mellon University Pittsburgh, PA
PhD, Engineering and Public Policy