Hi!👋 I'm Howard Han
I am a PhD Student at Carnegie Mellon University, Human-Computer Interaction Institute. I am fortunate to be advised by Nikolas Martelaro. I work on projects related to Human-Robot and Human-Agent Interaction, Design, Responsible AI, and HCI in general.
My research goal is to advance bidirectional Human-Robot and Human-Agent Interaction drawn from fields like Design, HCI, HRI, and AI. I am interested in tools and processes to augment the design process with a specific focus in robot design.
From Design to Human-Agent Interaction: Specifically, I work on projects on Public Space Service Robots, involving community members, especially people with mobility disability, in the initial co-design, simulation-based evaluation, and robot policy development for more socially inclusive and compliant robot deployment. Works from this line of research has been published at CHI and ASSETS (see and ), and covered in TechXplore and Triblive, a Pittsburgh local daily news outlet.
From Human-Agent Interaction to Design: Another line of research is to develop Design Agents that spark human creativity, critical thinking, and adaptability, built upon theories from Human-Robot Interaction.
Before starting my PhD, I completed a research-based master's at CMU, advised by Daragh Byrne, Sarah Fox and Ken Holstein. I hold a Bachelor's degree in Urban Planning from Tongji University, where I conduct research in urban computing and GIS.
Below are my publications and ongoing research projects.
Ongoing Research Threads

Public Space Robotics: Community-Driven Co-design, Simulation, and Robot Learning for Social Navigation and Communication
Advised by Nikolas Martelaro and Sarah Fox. In collaboration with CMU Mechanical Engineering and Civil Engineering Departments.
Informed by the ethnographic and design research from our group, we are exploring how to repurpose simulation-based platform for community engagement and how such engagement can inform socially compliant VLM-enhanced robot navigation and communication.
Related Publications:
[CHI '24], [ASSETS '23]
Design Agent: Understanding, Modeling, and Improving Human-Agent Interaction for more Adaptive and Contested Design Processes
Advised by Nikolas Martelaro
Design Agents are more than just LLM-enhanced design tools. Informed by theories from Human-Machine Interaction. We are exploring how to model and improve human-agent interaction for more adaptive and contested design processes.
Related Publications:
Enacting Facets of Adversarial Design with AI AgentsPublications

Enacting Facets of Adversarial Design with AI Agents
Skills: #Human-Agent Interaction #LLM Applications #Quantitative Research
Howard Han and Nikolas Martelaro
In Submission to the 2026 CHI Conference on Human Factors in Computing Systems 2026

Co-design accessible public robots: Insights from people with mobility disability, robotic practitioners and their collaborations
Skills: #Human-Robot Interaction #Co-design #Design Research
Howard Han, Franklin Mingzhe Li, Alesandra Baca Vazquez, Daragh Byrne, Nikolas Martelaro and Sarah Fox
Proceedings of the 2024 CHI Conference on Human Factors in Computing Systems 2024 [PDF]

The Robot in Our Path: Investigating the Perceptions of People with Motor Disabilities on Navigating Public Space Alongside Sidewalk Robots
Skills: #Accessibility #Qualitative Research
Howard Han and Franklin Li and Nikolas Martelaro and Daragh Byrne and Sarah Fox
ASSETS 2023 Short Paper 2023 [PDF]

WeAudit: Scaffolding User Auditors and AI Practitioners in Auditing Generative AI
Skills: #Generative AI #NLP #Crowdsourcing
Wesley Deng, Claire Wang, Howard Han, Jason Hong, Kenneth Holstein and Motahhare Eslami
ACM SIGCHI Conference on Computer-Supported Cooperative Work & Social Computing (CSCW) 2025 [PDF]

Catch my Eyebrow, Catch my Mind: Examining the Effect of Upper Facial Expressions on Emotional Recognition for VR Avatars
Skills: #Social Virtual Reality #Unity Development #Psychological Experiments
Xin Yi, Howard Han, Xinge Liu, Yutong Ren, Xin Tong, Yan Kong and Hewu Li
2023 IEEE Conference on Virtual Reality and 3D User Interfaces Abstracts and Workshops (VRW) 2023 [PDF]

Raise Your Eyebrows Higher: Facilitating Emotional Communication in Social Virtual Reality Through Region-Specific Facial Expression Exaggeration
Skills: #Social Virtual Reality #Facial Expression #Emotional Communication
Xueyang Wang, Sheng Zhao, Yihe Wang, Howard Han, Xinge Liu, Xin Yi, Xin Tong and Hewu Li
Proceedings of the 2025 CHI Conference on Human Factors in Computing Systems 2025 [PDF]

Evolution Of Historical Urban Landscape With Computer Vision And Machine Learning: A Case Study Of Berlin
Skills: #Applied Machine Learning #Data Visualization #Crowdsourcing
Hui Wan and Howard Han and Weishan Xu and Waishan Qiu and Wenjing Li and Xun Liu
Journal of Digital Landscape and Architecture 2022 [PDF]