Research Topics | 研究テーマ

Main research topics:

1. Social networks, travel behavior and joint decision-making processes
2. The effect of new transportation technologies on travel behavior and urban form
3. Travel behavior changes during the COVID-19 Pandemic
4. Validation methods for discrete choice models
5. Evacuation behavior during natural disasters
6. Built environment and travel behavior

See some highlights of specific projects below. More generally, my research output list is here.

①Social networks, travel behavior and joint decision making processes

As social animals, many of our decisions are made in coordination with members of our social groups. However, the traditional approaches to travel behavior modeling do not take into consideration this very important factor. The purpose of this project is to better understand how we make travel-related decisions in the groups we belong to. To do so, we are working on 1) novel data collection methods to collect data on joint travel behavior and its joint decision-making processes and 2) both qualitative and quantitative methods to better understand and ultimately model these processes.

Selected output:

• Parady, G., Suzuki, K., Oyama, Y., Chikaraishi, M. (2023) Activity detection with Google Maps Location History data: factors affecting joint activity detection probability and its potential application on real social networks. Travel Behaviour and Society 30
• Parady, G., Oyama, Y., Chikaraishi M. (2022) Understanding the joint decision-making process of leisure destination choices: Exploring new methodologies. Presented at the 16th International Conference on Travel Behavior Research, Santiago, Chile, December 11-15
• Han, C., Luo, L., Parady, G., Takami, K., Chikaraishi, M., Harata N. (2022) Modeling joint eating-out destination choice incorporating group utility. Presented at the International Conference of Asian-Pacific Planning Societies 2022、August 18-20.
• Parady, G., Frei, A., Kowald, M., Guidon, S., Wicki, M., van den Berg, P., Carrasco, J., Arentze, T., Timmermans, H., Wellman, B., Takami, K., Harata, N., Axhausen, K. (2021) A comparative study of social interaction frequencies among social network members in five countries. Journal of Transport Geography 90, 102934
• Parady, G., Takami, K., Harata, N. (2021) Egocentric social networks and social interactions in the Greater Tokyo Area. Transportation 48, pp. 831–856

②The effect of new transportation technologies on travel behavior and urban form

The transportation field is undergoing fast changes in terms of technological development. While these technological innovations promise to solve many of our urban problems, risks exist that the might contribute to exacerbate them if left unchecked. The purpose of this project is to understand the potential effects of these technologies on travel behavior and urban from to guide related policy making.

Selected output:

• Luo, L., Parady, G., Takami, K. (2023) Evaluating the Impact of Automated Vehicles on Residential Location Distribution using Activity-based Accessibility: A Case Study of Japanese Regional Areas. Presented at the 102nd TRB Annual Meeting, Washington D.C. USA, January 8-12.
• Luo, L., Parady, G., Takami, K. (2022) Evaluating the Impact of Private Autonomous Vehicles on Activity-based Accessibility in Japanese Regional Areas: A Case Study of Gunma Prefecture Transportation Research Interdisciplinary Perspectives 16, 100717 (Open Access)
• Kamijo,Y., Parady, G., Takami, K.: Required Simulated Population Ratios for Valid Assessment of Shared Autonomous Vehicles’ Impact Using Agent-Based Models
• Kamijo, Y., Parady G., Takami K. Stated Preference Survey and Intention Analysis of Autonomous Vehicle Purchase and Shared Autonomous Vehicle Service Use. JSTE Journal of Traffic Engineering (Special Issue) 7(2) A_326 – A_335 Feb, 2021 (In Japanese)