On May 28, 2026, at 15:00, the 402nd session of the School of Public Administration's “Lun Dao · Distinguished Lecture Series” was successfully held in Room 601 of Xingmin Building. The lecture featured Professor Li Hanlin, a specially appointed professor from the Department of Medical Humanities at Southeast University, who delivered a talk on the theme “Contractualism, Non-Aggregation, and Rough Estimation.” Professor Chen Zhen from the School of Public Administration served as the host, and faculty members and students from the school actively attended the event.

Professor Li Hanlin is currently an emeritus professor in the Department of Philosophy at The Chinese University of Hong Kong and an affiliate professor in the Department of Medical Humanities and Bioethics at the University of Washington School of Medicine, with a distinguished academic record. Professor Chen Zhen briefly introduced Professor Li's research areas and scholarly achievements, and extended a warm welcome and sincere gratitude for his visit.

Professor Li Hanlin began his discussion by delving into the core disputes of contemporary normative ethics. He analyzed the theoretical differences between contractarianism and utilitarianism in issues such as interest balancing and responsibility allocation. Based on this, he further explored the moral rationality and practical application boundaries of the non-aggregation principle, and, by combining life ethics case studies, emphasized the application of rough estimation methods in moral judgment and public decision-making, stressing that theoretical speculation must be closely aligned with real-life ethical dilemmas.

During the interactive discussion session, Professor Li Hanlin engaged in in-depth discussions with the on-site students and faculty on issues such as "the applicable conditions of the non-aggregation principle". The academic atmosphere was very intense. When summarizing, Professor Chen Zhen highly praised this lecture. He stated that Professor Li Hanlin's logic was rigorous and progressive, combining theoretical speculation with practical concern. This lecture provided a new perspective for understanding the current frontiers of normative ethics. This lecture was rich in academic content and had unique insights. It not only offered excellent academic demonstrations for students to cultivate problem awareness but also provided important inspirations for related theoretical research and practical exploration in reality. The lecture concluded successfully amid the enthusiastic applause from the students and faculty.