Hyung-Wook Choi

Frey, H. C., Choi, H.-W., & Kim, K. (2012). Portable Emission Measurement System for Emissions of Passenger Rail Locomotives. TRANSPORTATION RESEARCH RECORD, (2289), 56–63. https://doi.org/10.3141/2289-08

Graver, B. M., Frey, H. C., & Choi, H.-W. (2011). In-Use Measurement of Activity, Energy Use, and Emissions of a Plug-in Hybrid Electric Vehicle. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 45(20), 9044–9051. https://doi.org/10.1021/es201165d

Choi, H.-W., & Frey, H. C. (2010). Estimating Diesel Vehicle Emission Factors at Constant and High Speeds for Short Road Segments. TRANSPORTATION RESEARCH RECORD, (2158), 19–27. https://doi.org/10.3141/2158-03

Choi, H.-W., & Frey, H. C. (2010). 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. https://doi.org/10.1021/es903330k

Choi, H.-W., & Frey, H. C. (2009). 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. https://doi.org/10.1016/j.trd.2009.09.001