- Introduced and applied a causal inference method: regression discontinuity.
- China winter district heating policy at the Huai River enables a natural experiment for causal inference.
- Demonstrated that correlations in observational studies do not accurately reflect causal relationships.
- Demonstrated the importance of integrating causal thinking into correlation-based statistical methods.
- Compared two linear regression approaches used in thermal comfort field studies.
- The two approaches yield different neutral temperatures and comfort zones.
- Conducted air tracer experiments in a subway station.
- Discovered the airflow pattern and velocity distribution characteristics of the piston wind.