Conceptual framework and models for identifying and organizing usability impact factors of mobile phones. - Dong-Han Ham; Jeongyun Heo; Peter Fossick; B. L. William Wong; Sanghyun Park; Chiwon Song; Mike D. Bradley (OZCHI, 2006)

Model-Based Approaches to Quantifying the Usability of Mobile Phones. - Dong-Han Ham; Jeongyun Heo; Peter Fossick; B. L. William Wong; Sanghyun Park; Chiwon Song; Mike D. Bradley (HCI (2), 2007)

A Study on the Improving Product Usability Applying the Kano's Model of Customer Satisfaction. - Jeongyun Heo; Sanghyun Park; Chiwon Song (HCI (1), 2007)

A framework for evaluating the usability of mobile phones based on multi-level, hierarchical model of usability factors. - Jeongyun Heo; Dong-Han Ham; Sanghyun Park; Chiwon Song; Wan Chul Yoon (Interact. Comput., 2009)