1. Contact through official website, Academia Sinica: You can browse Professor Han's personal information page in official website, Academia Sinica, get his contact information, such as e-mail, telephone number or mailing address, and then contact him through these methods.
2. Contact through social media platforms: You can search Professor Han's name on social media platforms, such as Weibo, LinkedIn or ResearchGate, and then send him information or messages directly through these platforms to get contact information.
3. Contact through academic journals or conferences: If you are an academic colleague, you can try to search for Professor Han's papers or lecture records in academic journals or conferences, and then get their contact information through these channels for further exchanges and cooperation.