PUBLICATIONS

Journal Papers

(* Corresponding author)

  1. Ai, C., Xu, G., and Qiu, S.* (2018). “Robust Rail Track Fastener Identification Under Extremely Low Illumination.” Proceedings of the Institute of Mechanical Engineers Part F: Journal of Rail and Rapid Transit, OnlineFirst. [Link]
  2. 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. Vol. 33(7), 571-584. [Link].
  3. 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, OnlineFirst. [Link].
  4. 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, Vol. 2621, 62-70. [Link] [Preprint].
  5. 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].
  6. 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, Vol. 2542, 25-32 [Link] [Preprint].
  7. 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].
  8. 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].
  9. 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].
  10. 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, Vol. 2367, 53–62 [Link].
  11. 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].
  12. 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].
  13. 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. Tsai, Y. and Ai, C. “An Automated Superelevation Measurement Method for Horizontal Curve Safety Assessment Using a Low-Cost Mobile Device.” U.S. Patent Provisional Application GTRC7520.
  2. 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].

Peer-Reviewed Conference Papers

  1. 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]
  2. 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]
  3. 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].
  4. 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].
  5. 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].
  6. 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].
  7. 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].
  8. 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].
  9. 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].

Other Conference Papers and Presentations

(* Corresponding author, # Presenter)

  1. 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.
  2. 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.
  3. Tsai, Y., Ai, C.*#, and Wu, Y. “Intelligent Traffic Sign Retroreflectivity Condition Assessment Using Computer Vision and Mobile LiDAR.” 3rd GDOT/GTI Transportation Research Expo, Atlanta, GA.
  4. Wang, Z.*, Ai, C.#(2014). “Using GPS/GIS for Managing Pavement Investigation Data and Supporting Decision Making.” Georgia Geospatial Conference 2014, Athens, GA
  5. Ai, C.*# and Tsai, Y. (2012). “An Enhanced Automatic Traffic Sign Detection Algorithm Using SVM-based Color Segmentation for Real World Lighting Adaptation.” 8th Annual Interuniversity Symposium on Infrastructure Management, Atlanta, GA
  6. Tsai, Y.*#, Wang, Z., Li, F., and Ai, C. (2012). “A Sensor-Based and Spatially Enabled Roadway Asset Management System.” 9th National Conference on Transportation Asset Management, San Diego, CA.
  7. Tsai, Y.#Ai, C.*, Ellington, B. (2010). “Critical Assessment of Using Image Sign Detection Algorithms for Roadway Sign Asset Inventory.” Conference of NDE/NDT for Highways and Bridges: Structural Materials Technology (SMT), New York, NY.
  8. Ai, C.*# and Tsai, Y. (2009). “Partial Differential Equation (PDE) Incorporated Multi-Feature Traffic Sign Detection.” 5th Annual Inter-university Symposium on Infrastructure Management (AISIM5), Iowa City, IA. (Best Paper Award)

Technical Reports 

  1. Tsai, Y., Ai, C., and Wu, Y. (2017). “Curve Identification for High Friction Surface Treatment (HFST) Installation Recommendation.” Final Report FHWA-GA-17-1505, Georgia Department of Transportation 15-05. [Link]
  2. Tsai, Y., Wang, Z., and Ai, C. (2017). “Implementation of Automatic Sign Inventory and Pavement Condition Evaluation on Georgia’s Interstate Highways.” Final Report FHWA-GA-16-15-11, Georgia Department of Transportation 15-11. [Link][AASHTO Sweet Sixteen 2017][Georgia Tech News]
  3. Tsai, Y., and Ai, C. (2016). “Delta TechOps Parking Lot Traffic and Employee Safety Improvement Study.” Final Report, Delta TechOps RG274. [Report upon request]