別記様式第５号
論文審査の要旨
博士の専攻分野の名称

博士 （工学）

学位授与の要件

学位規則第４条第１・２項該当氏名

HONGXIANG DING

論 文 題 目
Behavioral research for pandemic policymaking: Focusing on activity-travel behavior
and social contact decisions under the impacts of COVID-19（パンデミック政策のための行動：COVID-19 の影響下における活動・交通と社会的接触の意思決定に着目して）論文審査担当者
主査

教授

張 峻屹

審査委員

教授

馮審査委員

教授

藤原 章正

審査委員

准教授

鹿嶋 小緒里

審査委員

准教授

力石 真

審査委員

准教授

布施 正暁

涛

〔論文審査の要旨〕
This research focuses on the impacts of COVID-19 and people’s behavioral responses to theimpacts. It aims at providing behaviorally sound evidence for supporting the policymaking of
COVID-19 and future pandemics. Such evidence has remained unknown. To fill such a researchgap, this study implemented two types of nationwide online questionnaire surveys in six developed
countries, including Japan, and conducted several modeling analyses. The surveys are all based on
the life-oriented approach, where the first targets monthly activity-travel behaviors between Apriland September 2020, only in Japan (respondents: 2643) and the second, implemented inMarch-May 2021, investigates both activity-travel and social contact behaviors in six developed
countries before and during COVID-19 pandemic (respondents: more than 1000 in each country
and 7245 in total). A dynamic structural equation model, a mixed hybrid choice model, and a
copula-based integrated model were built and estimated. Factors incorporated into the modeling
analyses include, (1) individual and household attributes, (2) attributes of activity, travel, and social
contact behaviors, (3) triggers of behavior changes, and (4) various psychological factors.
Psychological factors further include reliability of risk information, risk perceptions at different
spatial scales, expertise and competence of and trust in stakeholders (government, medicalagencies, etc.), cultural risk factors (hierarchists, individualists, egalitarians, fatalists),
pre-pandemic preparedness, coping ability (self-efficiency, safety awareness, etc.), attitudes toward
necessity and punishment (in case of violation of pandemic rules) of activity participation, attitudes

towardvarious

COVID-19

policies(PASS:“Prepare-protect-provide”,“Avoid-adjust”,“Shift-share”, and “Substitute-stop”), LASTING: “Life needs”, “Activity participation”, “Space”,
and “Time-timing”), etc. Various behavioral insights are summarized and policy implications areextensively discussed.
The dissertation consists of eight chapters: (1) “Introduction”, (2) “Literature review”, (3)“Pandemic-responsive methodologies”, (4) “Capturing temporal dynamics of behavioral andpsychological adaptations to COVID-19”, (5) “Influences of preparedness and correlated culturaland psychological factors on choice behaviors in response to COVID-19: A case study on travel
mode choices”, (6) “Differences of social contacts by activity settings before and during theCOVID-19 pandemic and associational analysis”, (7) “Investigation of multi-faceted social contact
decisions under the impacts of COVID-19: Joint analysis of contact mode choices and the numberof contacted persons”, and (8) “Conclusions”.
The applicant already published the following peer-reviewed papers. Among the published papers,
there are two first-authored papers and two papers in journals with an impact factor (web ofscience).
1) Ding, H., & Zhang, J. (2021). Dynamic associations between temporal behavior changes
caused by the COVID-19 pandemic and subjective assessments of policymaking: A casestudy in Japan. Transport Policy, 110, 58-70. (IF=6.173) (Chapter 4)2) Ding, H., Zhang, J. & Zhang, L. (2022). Psychological/cultural risk factors andinfluenza-induced preparedness associated the travel mode choices under the impacts ofCOVID-19: Analysis based on a mixed hybrid choice model. Transport Policy. (IF=6.173)(Under review: Passed the first round of review (major revision) - Resubmitted onDecember 12, 2022) (Chapter 5)3) Ding, H., Zhang, J., Zhang, L., & Feng, T. (2023). Social contact for daily activities during
the COVID-19 pandemic in six developed countries, Book chapter for Research Handbook
on Transport and COVID-19. Edward Elgar Publishing. (Accepted on December 5, 2022)(Chapter 6)4) Ding, H., Zhang, J. (2023). Dependence analysis of social contact behaviors under theimpacts of COVID-19 based on a copula approach. Science of the Total Environment.
(IF=10.753) (Under review: Submitted on January 9, 2023) (Chapter 7)5) Zhang, J., Zhang, R., Ding, H., Li, S., Liu, R., Ma, S., ... & Hayashi, Y. (2021). Effects oftransport-related COVID-19 policy measures: a case study of six developed countries.
Transport Policy, 110, 37-57. (IF=6.173) (for supporting Chapters 1 & 2)
With the above evidence, the applicant is judged as sufficiently qualified to be awarded the degreeof “Doctor of Philosophy in Engineering”.
備考：審査の要旨は，1,500 字以内とする。