Rethinking Healthcare -- Development and Testing of a Usability Checklist for the Evaluation of Control Interfaces of Electrical Medical Beds -- Kits for Patients with Transtibial Amputation in the Pre- and Post-Prosthetic Phases -- Research on Social Innovation Design of SCD Pre-hospital Emergency Equipment Based on IoT Technology -- Towards a Practical Approach for Assessing Pressure Relief Activities for Manual Wheelchair Users in their Daily Lives -- Principles for Designing an mHealth App for Participatory Research and Management of Chronic Pain -- Automated Escalation and Incident Management in Healthcare during Mass Casualties and Pandemic Events -- Different Patterns of Medication Administration between Inside and Outside the Patient Room using Electronic Medical Record Log Data -- Systematic Review of The Importance of Human Factors in Incorporating Healthcare Automation -- Scenario Planning in Healthcare Development in the VUCA World -- The Digital Dilemma and the Healthy Nation -- Development of Autonomous UVC Disinfectant Robot -- Requirements for a Game-Based Approach to Strengthen Leadership in Health Care -- Towards an Effective Web-based Virtual Health Intervention: The Impact of Media Platform, Visual Framing, and Race on Social Presence and Transportation Ratings -- The Design of Outpatient Services in Children's Hospitals based on the Double Diamond Model -- Artificial Intelligence Applications and Ethical Issues -- Brown Hands Aren't Terrorists: Challenges in Image Classification of Violent Extremist Content -- A Βibliometric Analysis of Intelligent Agent Researches during 2010 ~ 2020 based on VOS Viewer -- What if: Human Rights vs Science - or Both? An Unusual Argument from a Disability Perspective -- Sources of Risk and Design Principles of Trustworthy Artificial Intelligence -- Analysis of the Application of Artificial Intelligence in the Creative Space -- Benchmarking Robots by Inducing Failures in Competition Scenarios -- Fairness and the Need for Regulation of AI in Medicine, Teaching, and Recruiting -- Digital Human Modeling in Product and Service Design -- Research on Tourism Marketing Based on Community E-commerce -- An Empirical Study of the Influencing Factors on User Experience for Barrage Video Website - A Case Study of Bilibili -- Application of Design Thinking in the Education Segment, Regarding the Human-Computer Interactions -- Learning Effectiveness Evaluation of Lesson Plan on Streamline in Model Design Course -- Comprehensive Study of Digital Restoration of Buddha Statues in Qingzhou by 3D Technology -- Influence of the Color and Logo Position of HNB Products on User Experience Based on Eye Tracking -- A Study on the Effect of Online Vertical Searching Advertising Presence towards Customer Behavioral Intentions -- Influence of HNB Product Packaging Health Warning Design on Risk Perception Based on Eye Tracking -- The Influence of the Aesthetic Design of Taobao APP on Users' Emotional Experience -- Research on Chinese Traditional Garden Immersive Aesthetic Experience in the Era of Artificial Intelligence.

This two-volume set LNCS 12777 and 12778 constitutes the thoroughly refereed proceedings of the 12th International Conference on Digital Human Modeling and Applications in Health, Safety, Ergonomics and Risk Management, DHM 2021, which was held virtually as part of the 23rd HCI International Conference, HCII 2021, in July 2021. The total of 1276 papers and 241 posters included in the 39 HCII 2021 proceedings volumes was carefully reviewed and selected from 5222 submissions. DHM 2021 includes a total of 56 papers; they were organized in topical sections named: Part I, Human Body, Motion and Behavior: Ergonomics, human factors and occupational health; human body and motion modeling; and language, communication and behavior modeling. Part II, AI, Product and Service: Rethinking healthcare; artificial intelligence applications and ethical issues; and digital human modeling in product and service design.