PUBLICATIONS

Journal Papers

(* Corresponding author; __ Advisees)

  1. Ren, Y.*, Lu, P., Ai, C., Gao, L., Qiu, S., and Tolliver, D. (2021).“Emerging Rail TrackInspection for Local Lines: A Review.” ASCE Journal of Transportation Engineering. (In Press).
  2. Hennessy, E.*, and Ai, C.“Roadway Lighting and Non-Motorist Crashes: A SpatialComparison of Cambridge, MA.” Journal of Transportation Research Record. (In Press).
  3. Keramati, A., Lu, P., Ren, Y.*, Tolliver, D., and Ai, C. (2021). “Investigating the Effectiveness of Safety Countermeasures at Highway-Rail At-Grade Crossings using a Competing RiskModel.” Journal of Safety Research. (In Press).
  4. Ryan, A.*, Ai, C., Knodler, M., and Fitzpatrick, C. (2020). Evaluation of Small Unmanned Aerial System Highway Volume and Speed-Sensing Applications.IET Intelligent Transportation Systems 2020(14), 1-14. [Link].
  5. Hou, Q., and Ai, C.* (2020). “A Network-level Sidewalk Inventory Method using Mobile LiDAR and Deep Learning.” Transportation Research Part C:  Emerging Technologies, 119, 102772. [Link].
  6. Ai, C., Xu, G., and Qiu, S.* (2019). “Robust Rail Track Fastener Identification Under Extremely Low Illumination.” Proceedings of the Institute of Mechanical Engineers Part F: Journal of Rail and Rapid Transit, 233(4), 410-419. [Link]
  7. Ai, C., Qiu, S.*, Xu, G., Zhang, A., and Wang, C. (2018). “A Non-Ballasted Rail Track Slab Crack Identification Method Using a Level Set Based Active Contour Model.” Computer-Aided Civil and Infrastructure Engineering, 33(7), 571-584. [Link].
  8. Tsai, Y., Pranav, C.P.*, Wu, Y., and Ai, C.. (2018). “Identification of Site Characteristics for Proactive High-Friction Surface Treatment Site-Selection Using Sensor-Based, Detailed, Location-Referenced Curve Characteristics Data.” Transportation Research Record: Journal of the Transportation Research Board, 2672(38), 69-80. [Link].
  9. Tsai, Y. and Ai, C.*. (2017). “Automated Superelevation Measurement Method Using a Low-Cost Device: An Efficient, Cost-Effective Approach Toward Intelligent Horizontal Curve Safety Assessment.” Transportation Research Record: Journal of the Transportation Research Board, 2621(1), 62-70. [Link] [Preprint].
  10. Ai, C.* and Tsai, Y. (2016). “Automated Traffic Sign Retroreflectivity Condition Assessment Using Mobile LIDAR and Computer Vision.” Transportation Research Part C:  Emerging Technologies, 63, 96-113 [Link].
  11. Ai, C.*, and Tsai, Y. (2016). “Automated Sidewalk Assessment Method for Americans with Disabilities Act Compliance Using Three-Dimensional Mobile Lidar.” Transportation Research Record: Journal of the Transportation Research Board, 2542(1), 25-32 [Link] [Preprint].
  12. Ai, C.* and Tsai, Y. (2015). ”Automatic Horizontal Curve Identification and Measurement Method Using GPS Data.” ASCE Journal of Transportation Engineering, 141(2), 04014078 [Link] [Preprint].
  13. Ai, C.* and Tsai, Y. (2015). “Critical Assessment of an Enhanced Traffic Sign Detection Method Using Mobile LiDAR and INS Technologies.” ASCE Journal of Transportation Engineering, 141(5), 04014096. [Link].
  14. Ai, C.* and Tsai, Y. (2015). “Geometry Preserving Active Polygon-Incorporated Sign Detection Algorithm.” ASCE Journal of Computing in Civil Engineering, 29(6), 04014092. [Link].
  15. Tsai, Y., Ai, C.*, Wang Z., and Pitts, E. (2013). “Mobile Cross Slope Measurement Method Using LiDAR Technology.” Transportation Research Record: Journal of the Transportation Research Board, 2367(1), 53–62 [Link].
  16. Tsai, Y., Wu, Y.*, Ai, C., and Pitts, E. (2012). ”Critical Assessment of Measuring Concrete Joint Faulting Using 3D Continuous Pavement Profile Data.” ASCE Journal of Transportation Engineering, 138(11), 1291–1296. [Link].
  17. Tsai, Y.*, Dusanter, T., Wu, Y., Ai, C. and Caitucoli, Q. (2012). “Automatic Truck Processing Time Extraction at Marine Container Terminal Gates Using Low Frame Rate Images.” Journal of Intelligent Transportation Systems, 16(4), 211–225 [Link].
  18. Ai, C., and Tsai, Y.* (2012). ”Hybrid Active Contour–Incorporated Sign Detection Algorithm.” ASCE Journal of Computing in Civil Engineering, 26(1), 28–36. [Link].

Patents

  1. Ai, C., Tsai, Y., Wang, Z., and Yezzi, A. “Systems and Methods for Identifying Traffic Control Devices and Testing the Retroreflectivity of the Same.” U.S. Patent US9767371 B2 (Granted on Sept. 19th, 2017). [Link].

Dissertation

  1. “A Sensing Methodology for an Intelligent Traffic Sign Inventory and Condition Assessment Using GPS/GIS, Computer Vision, and Mobile LiDAR Technologies.” Georgia Institute of Technology, March 27, 2013. [Link].

Refereed Conference Papers

  1. Hennessy, E.*, and Ai, C. (2021). “Roadway Lighting and Non-Motorist Crashes: A SpatialComparison of Cambridge, MA.” Transportation Research Board 100th Annual Meeting, Washington, D.C.
  2. Deliali, A.*, Christofa, E., and Ai, C.(2021). “Bike Boxes: A Review of Design GuidelinesAcross the US and Impacts on Safety.” Transportation Research Board 100th Annual Meeting, Washington, D.C.
  3. Deliali, A.*, Ai, C., and Christofa, E. (2021). “Assessing the Impact of Bicycle InfrastructureTreatment Type on the Frequency of Right-Hook Conflicts Between Bicyclists and Motorized Vehicles at Signalized intersections.” Transportation Research Board 100th Annual Meeting, Washington, D.C.
  4. Ai, C., and Hou, Q.*(2020). “Improving Pedestrian Infrastructure Inventory in Massachusetts using Mobile LiDAR and Deep Learning.” Nvidia GPU Technology Conference, March 23-26, Silicon Valley, CA. (Virtual event due to COVID-19)
  5. Wang, Y., Ai, C.*, and Qiu, S. (2020). “Development of A Large-Scale Horizontal Curve Inventory for Safety Analysis Using Open GIS Data.” 99th Transportation Research Board Annual Meeting, Washington D.C.
  6. Ai, C.*, Qiu, S., and Wang, Y. (2019). “Development of A Nationwide Horizontal Curve Inventory Using Open GIS Data.” International Conference on Transportation & Development, Alexandria, VA.
  7. Qiu, S., Xue, B., Chen, Y., and Ai, C.* (2019). “Utility Tunnel Route Optimization for New Development in Urbanized Areas.” International Conference on Transportation & Development, Alexandria, VA.
  8. Chen, Y., Xue, B., Ning, N., Huang, Z., Qiu, S., and Ai, C.* (2018). “Bi-Level Programming Model for Unified Urban Planning of Ground Transportation and Underground Utility Tunnel Systems.” International Conference on Transportation & Development 2018, Pittsburgh, PA.
  9. Qiu, S., Li, J., Xue, B., Huang, Z., Wei, Z., and Ai, C.* (2018). “Comprehensive Cost-Benefit Evaluation Method for Underground Utility Tunnel Construction Incorporating Road User Cost.” International Conference on Transportation & Development 2018, Pittsburgh, PA.
  10. Tsai, Y., and Ai, C.* (2017). ” An Automated Superelevation Measurement Method For Horizontal Curve Safety Assessment Using A Low-Cost Mobile Device.” 96th Transportation Research Board Annual Meeting, Washington D.C. [Paper]
  11. Ai, C.* and Tsai, Y. (2016). “An Automated Sidewalk Assessment Method for the Americans with Disabilities Act Compliance Using 3-D Mobile LiDAR.” 95th Transportation Research Board Annual Meeting, Washington D.C. [Paper]
  12. Ai, C.* and Tsai, Y. (2015). “Automatic Awareness of Traffic Sign Condition Changes Using Multi-Temporal Sensing Data.” 94th Transportation Research Board Annual Meeting, Washington D.C. [Paper].
  13. Ai, C.* and Tsai, Y. (2014). “An Automatic Horizontal Curve Radii Measurement Method for Roadway Safety Using GPS Data.” 93rd Transportation Research Board Annual Meeting, Washington D.C. [Paper].
  14. Tsai, Y., Ai, C.*, Wang Z., and Pitts, E. (2013). “A Mobile Cross Slope Measurement Method Using LiDAR Technology.” 92nd Transportation Research Board Annual Meeting, Washington D.C. [Paper].
  15. Ai, C., and Tsai, Y.* (2012). “Critical Assessment of Automatic Traffic Sign Detection Using Three-Dimensional LiDAR Point Cloud Data.” 91st Transportation Research Board Annual Meeting, Washington D.C. [Paper].
  16. Tsai, Y., Wu, Y.* and Ai, C. (2011). “Feasibility Study of Measuring Concrete Joint Faulting Using 3D Continuous Pavement Profile Data.” 90th Transportation Research Board Annual Meeting, Washington D.C. [Paper].
  17. Tsai, Y., Ai, C.*, Wu, Y., and Siplon, P. (2010). “Simulating Port Logistics Operations Using 3D Visualization Technology.” International Conference on Civil and Building Engineering (ICCBE), Nottingham, UK. [Paper].
  18. Ai, C.* and Tsai, Y. (2010). “Partial Differential Equation (PDE) Incorporated Multi-Feature Traffic Sign Detection.”89th Transportation Research Board Annual Meeting, Washington D.C. [Paper].

Technical Reports 

  1. Ai, C., and Hou, Q. (2019). “Improving Pedestrian Infrastructure Inventory in Massachusetts using Mobile LiDAR.” Massachusetts Department of Transportation 19-007. [Link][AASHTO Sweet Sixteen 2020]
  2. Tsai, Y., Ai, C., and Wu, Y. (2017). “Curve Identification for High Friction Surface Treatment (HFST) Installation Recommendation.”  Georgia Department of Transportation 15-05. [Link]
  3. Tsai, Y., Wang, Z., and Ai, C. (2017). “Implementation of Automatic Sign Inventory and Pavement Condition Evaluation on Georgia’s Interstate Highways.” Georgia Department of Transportation 15-11. [Link][AASHTO Sweet Sixteen 2017][Georgia Tech News]
  4. Tsai, Y., and Ai, C. (2016). “Delta TechOps Parking Lot Traffic and Employee Safety Improvement Study.” Final Report, Delta TechOps RG274. [Report upon request]