Stanley Chang - Personal Website

About Me

I am Yung-Ju (Stanley) Chang, an Associate Professor at the Department of Computer Science, National Yang Ming Chiao Tung University. From 2023 to 2024, I was a visiting scholar at Stanford University, Department of Communication, contributing to the Human Screenome Project. I earned my B.S. in Computer Science from National Chiao Tung University and an M.S. and Ph.D. from the School of Information at the University of Michigan.

Currently, I lead the Mobile and Ubiquitous Interaction Lab (MUILab), where my research sits at the intersection of Human-Computer Interaction (HCI) and Ubiquitous Computing (Ubicomp). My primary focus is on mobile notifications and multitasking, mobile crowdsourcing, mobile media consumption, human-AI communication, and social media influencers. Recently, I have started exploring technological interventions to promote digital wellbeing on mobile devices, using screenshot-based methodologies to better understand mobile phone and media behavior.

If you're interested in this topic, let's chat! Collaboration is the spice of academic life, and I'm always eager to add more flavor!

For Prospective Students

I welcome students interested in HCI research, particularly focusing on mobile phone usage. Enthusiasm and a genuine interest in the topic are the most important attributes I look for in students. Feel free to reach out with your ideas!

Selected Publications

Verifying or Clarifying? User Preferences for Mobile Crowdsourcing in Response to Seemingly Inconsistent Sensor Data [In Press] [PDF]

You-Hsuan Chiang, Je-Wei Hsu, Hsin-Lun Chiu, Chung-En Liu, Tzu-Yu Huang, and Yung-Ju Chang* (PACM CSCW '24)

"I Want Lower Tone for Work-Related Notifications": Exploring the Effectiveness of User-Assigned Notification Alerts in Improving User Speculation of and Attendance to Mobile Notifications [PDF]

Tang-Jie Chang, Li-Ting Su, Yong-Han Lin, Jie Tsai, ZiXun Tang, and Yung-Ju Chang* (PACM MHCI '24)

Investigating User-perceived Impacts of Contextual Factors on Opportune Moments [PDF]

Yu-Jen Lee, Meng-Hsin Wu, Chung Chiao Chang, XiJing Chang, and Yung-Ju Chang* (PACM MHCI '24)

Pinning, Sorting, and Categorizing Notifications: A Mixed-methods Usage and Experience Study of Mobile Notification-management Features [PDF]

Yong-Han Lin, Li-Ting Su, Uei-Dar Chen, Yi-Chi Lee, Peng-Jui Wang, and Yung-Ju Chang* (IMWUT '24)

“I Prefer Regular Visitors to Answer My Questions”: Users’ Desired Experiential Background of Contributors for Location-based Crowdsourcing Platform [PDF]

Fang-Yu Lin, Pei-Hua Tsai, Chia-Yi Lee, Yi-Ting Ho, Yao-Kuang Chen, Yu-Chun Yen, and Yung-Ju Chang* (CHI '24)

Get Distracted or Missed the Stop? Investigating Public Transit Passengers’ Travel-Based Multitasking Behaviors, Motives, and Challenges [PDF]

Hsinju Lee, Fang-Hsin Hsu, Wei-Ko Li, Jie Tsai, Ying-Yu Chen, and Yung-Ju Chang* (CHI '23)

I Like Their Autonomy and Closeness to Me: Uncovering the Perceived Appeal of Social-Media Influencers [PDF]

Yu-Ling Chou, Hsuan-Jen Lee, Jie Tsai, Kung-Pai Lin, Faye Shih, and Yung-Ju Chang* (CHI '23)

Not Merely Deemed as Distraction: Investigating Smartphone Users’ Motivations for Notification-Interaction [PDF]

XiJing Chang, Fang-Hsin Hsu, En-Chi Liang, Zih-Yun Chiou, Ho-Hsuan Chuang, Fang-Ching Tseng, Yu-Hsin Lin, and Yung-Ju Chang* (CHI '23)

Are You Killing Time? Predicting Smartphone Users’ Time-killing Moments via Fusion of Smartphone Sensor Data and Screenshots [PDF]

Yu-Chun Chen, Yu-Jen Lee, Kuei-Chun Kao, Jie Tsai, En-Chi Liang, Wei-Chen Chiu, Faye Shih, and Yung-Ju Chang* (CHI '23)

Multiple Device Users' Actual and Ideal Cross-Device Usage for Multi-Stage Notification-Interactions: An ESM Study Addressing the Usage Gap and Impacts of Device Context [PDF]

Fang-Ching Tseng, Zih-Yun Chiou, Ho-Hsuan Chuang, Li-Ting Su, Yong-Han Lin, Yu-Rou Lin, Yi-Chi Lee, Peng-Jui Wang, Uei-Dar Chen, and Yung-Ju Chang* (CHI '23)

What Makes IM Users (Un)Responsive: An Empirical Investigation for Understanding IM Responsiveness [PDF]

Hao-Ping Lee, Yi-Shyuan Chiang, Yu-Ling Chou, Kung-Pai Lin, and Yung-Ju Chang* (IJHCS '23)

Predicting and Exploring Abandonment Signals in a Banking Task-Oriented Chatbot Service [PDF]

Chieh Hsu, Hsin-Chien Tung, Hong-Han Shuai, Yung-Ju Chang* (IJHCI '23)

Scanning or Simply Unengaged in Reading? Opportune Moments for Pushed News Notifications and Their Relationship with Smartphone Users' Choice of News-reading Modes [PDF]

Chen-Chin Lin, Chia-Chen Wu, Ping-Ju Huang, Yu-Hsin Lai, Yi-Ting Ho, Chih-Chi Chung, and Yung-Ju Chang* (PACM MHCI '23)

Tracking the Temporal Flows of Mobile Communication in Daily Life [PDF]

Morgan Ross, Joseph Bayer*, Lisa Rhee, Ivory Potti, Yung-Ju Chang (New Media and Society '23)

Perceived vs. Observed mHealth Behavior: A Naturalistic Investigation of Tracking Apps and Daily Movement [PDF]

Chang Mao, Joseph Bayer*, Morgan Ross, Lisa Rhee, Huyen Le, Jerry Mount, Hsiu-Chi Chang, Yung-Ju Chang, Alex Hedstrom, Shelly Hovick (Mobile Media & Communication '23)

“Because I’m Restricted, 2–4 PM Unable to See Messages”: Exploring Users’ Perceptions and Likely Practices around Exposing Attention-management Information on IM Statuses [PDF]

Yu-Ling Chou, Yu-Ling Chien, Yu-Hsin Lin, Kung-Pai Lin, Faye Shih, and Yung-Ju Chang* (CHI '22)

Predicting Opportune Moments to Deliver Notifications in Virtual Reality [PDF]

Kuan-Wen Chen, Yung-Ju Chang*, Liwei Chan (CHI '22)

Why Did You/I Read but Not Reply? IM Users’ Unresponded Read-Receipt Practices and Explanations [PDF]

Yu-Ling Chou, Yi-Hsiu Lin, Tzu-Yi Lin, Hsin Ying You, and Yung-Ju Chang* (CHI '22)

How to Guide Task-oriented Chatbot Users, and When: A Mixed-methods Study of Combinations of Chatbot Guidance Types and Timings [PDF]

Su-Fang Yeh, Meng-Hsin Wu, Tze-Yu Chen, Yen-Chun Lin, XiJing Chang, You-Hsuan Chiang, and Yung-Ju Chang* (CHI '22) [Honorable Mention Award for Best Paper]

Analyzing GPS Data for Psychological Research: A Tutorial [PDF]

Sandrine Müller, Joseph Bayer*, Morgan Quinn Ross, Jerry Mount, Clemens Stachl, Gabriella M. Harari, Yung-Ju Chang, and Huyen T. (AMPPS '22)

Investigating Four Navigation Aids for Supporting Navigator Performance and Independence in Virtual Reality [PDF]

Ting-Yu Kuo, Yung-Ju Chang*, and Hung-Kuo Chu (IJHCI '22)

A Source You Prefer, or Majority? Investigating User Responses to Conflicting Opinions in Multi-platform Restaurant-review Lists [PDF]

Tzu-Hao Lin, Yen-Yun Liu, Hong-Han Shuai, Fang-Hsin Hsu, and Yung-Ju Chang* (IJHCI '22)

A Lab-Based Investigation of Reaction Time and Reading Performance using Different In-Vehicle Reading Interfaces during Self-Driving [PDF]

Lei Hsiung, Yung-Ju Chang, Wei-Ko Li, Tsung-Yi Ho, and Shan-Hung Wu* (Automotive UI '22)

What Kinds of Experiences Do you Desire? A Preliminary Study of Desired Experiences of Contributors in Location-Based Mobile Crowdsourcing [PDF]

Fang-Yu Lin, Chia-Yi Lee, Yi-Ting Ho, Yao-Kuang Chen, Grace Yu-Chun Yen, and Yung-Ju Chang* (CHI LBW '22)

Screenshot Journey Auditor: A Tool to Support Analysis of Smartphone Media Consumption Journey Using Screenshot Data [PDF]

Chen-Chin Lin, Jian-Hua Jiang Chen, Rebecca Ping Yu, Wan-Yun Yu, and Yung-Ju Chang* (CSCW EA '22)

“This is Why I Like Them!”: Exploring the Perceived Appeal of Social Media Influencers vs. Traditional Mass Media [PDF]

Hsuan-Jen Lee, Yu-Ling Chou, Jie Tsai, and Yung-Ju Chang* (CSCW EA '22)

CAMPUS: A University Crowdsourcing Platform for Reporting Facility, Status Update, and Problem Area Information [PDF]

Chih-Chi Chung, Yen-Chun Lin, Yu-Cheng Wang, Tze-Yu Chen, Chia-Yu Chen, Xinye Jiang, Fang-Yu Lin, Yu Hao Weng, and Yung-Ju Chang* (CSCW EA '22)

Investigating Correction Effects of Different Modalities for Misinformation about COVID-19 [PDF]

Yu-Chia Tseng, Nanyi Bi, Yung-Ju Chang, and Chien Wen (Tina) Yuan* (CSCW EA '22)

IM Receptivity and Presentation-type Preferences among Users of a Mobile App with Automated Receptivity-status Adjustment [PDF]

Ting-Wei Wu, Yu-Ling Chien, Hao-Ping Lee, and Yung-Ju Chang* (CHI '21)

“I Got Some Free Time”: Investigating Task-execution and Task-effort Metrics in Mobile Crowdsourcing Tasks [PDF]

Chia-En Chiang, Yu-Chun Chen, Fang-Yu Lin, Felicia Feng, Hao-An Wu, Hao-Ping Lee, Chang-Hsuan Yang, and Yung-Ju Chang* (CHI '21)

“Put it on the Top, I’ll Read it Later”: Investigating Users’ Desired Display Order for Smartphone Notifications [PDF]

Tzu-Chieh Lin, Yu-Shao Su, Emily Yang, Yun Han Chen, Hao-Ping Lee, and Yung-Ju Chang* (CHI '21)

Inviting Participants' Peers in a Mobile Assessment Study: An Empirical Investigation [PDF]

Yu-Lin Chang, Hao-Ping Lee, Yung-Ju Chang*, and Chih-Ya Shen (MobileHCI '21)

Making Meals Both Appealing and Healthy: A Food Presentation Simulation System [PDF]

Li-Hsing Zheng, Yao-Zhen Kuo, Jui Lo, and Yung-Ju Chang* (C&C '21)

Self-Attentive Recommendation for Multi-Source Review Package [PDF]

Pin-Yu Chen, Yu-Hsiu Chen, Hong-Han Shuai*, and Yung-Ju Chang (IJCNN '21)

Opportune Moments for the Multi-Stage Notification Responding Process: A Preliminary Investigation [PDF]

Chung Chiao Chang, Meng-Hsin Wu, Xi-Jing Chang, and Yung-Ju Chang* (UbiComp-ISWC '21)

Killing-Time Detection from Smartphone Screenshots [PDF]

Yu-Chun Chen, KeuiChun Kao, Yu-Jen Lee, Faye Shih, Wei-Chen Chiu, and Yung-Ju Chang* (UbiComp-ISWC '21)

I’m Interested, but Can/Would Only Skim It: Studying Smartphone Users’ Receptivity to News Notifications [PDF]

Ping-Ju Huang, Chia-Chen Wu, Yu-Hsin Lai, Chen-Chin Lin, and Yung-Ju Chang* (UbiComp-ISWC '21)

Occurrence and Triggers of Mobile News Exposure: A Screenshot-Based ESM Study [PDF]

Jian Hua Jiang Chen, Ming Yen Yeh, Chen-Chin Lin, Yung-Ju Chang*, Wan-Yun Yu, Rebecca Ping Yu (UbiComp-ISWC '21)

SYNC: A Crowdsourcing Platform for News Co-editing [PDF]

Jin An Lin, Feng-I Hsu, Shang-Hsun Lu, Hsin-Yu Yao, Tsai-Yu Kuo, Chieh Kai Lin, and Yung-Ju Chang* (CSCW EA '21)

Exploring Users’ Preferences on Chatbot’s Guidance Type and Timing [PDF]

Meng-Hsin Wu, Su-Fang Yeh, XiJing Chang, and Yung-Ju Chang* (CSCW EA '21)

Distinguishing IM Communication Patterns with Relationship and Conversation Topic [PDF]

Kung-Pai Lin, Hao-Ping (Hank) Lee, Yu-Ling Chou, Faye Shih, and Yung-Ju Chang* (CSCW EA '21)

Tell Me When Users Leave: Predicting Users’ Abandonment of A Task-Oriented Chatbot Service using Explainable Deep Learning [PDF]

Yu-Wei Yang, Chieh Hsu, Hsin-Chien Tung, Hong-Han Shuai, and Yung-Ju Chang* (CUI EA '21)

Bridging the Virtual and Real Worlds: A Preliminary Study of Messaging Notifications in Virtual Reality [PDF]

Ching-Yu Hsieh, Yi-Shyuan Chiang, Hung-Yu Chiu, and Yung-Ju Chang* (CHI '20)

A Conversation Analysis of Non-Progress and Coping Strategies with a Banking Task-Oriented Chatbot [PDF]

Chi-Hsun Li, Su-Fang Yeh, Tang-Jie Chang, Meng-Hsuan Tsai, Ken Chen, and Yung-Ju Chang* (CHI '20)

Exploring the Design Space of User-System Communication for Smart-home Routine Assistants [PDF]

Yi-Shyuan Chiang, Ruei-Che Chang, Yi-Lin Chuang, Shih-Ya Chou, Hao-Ping Lee, I-Ju Lin, Jian-Hua Jiang Chen, and Yung-Ju Chang* (CHI '20)

V-Eye: A Vision-based Navigation System for the Visually Impaired [PDF]

Ping-Jung Duh, Yu-Cheng Sung, Liang-Yu Fan Chiang, Yung-Ju Chang, and Kuan-Wen Chen* (IEEE Transactions on Multimedia, 2020)

Combining Participatory and ESM: A Hybrid Approach to Collecting Annotated Mobility Data [PDF]

Hsiu-Chi Chang, Yung-Ju Chang*, Mark W. Newman, and Chih-Hsin Lin (CHI EA '20)

A Preliminary Attempt of an Intelligent System Predicting Users’ Correctness of Notifications’ Sender Speculation [PDF]

Tang-Jie Chang, Jian-Hua Jiang Chen, Hao-Ping Lee, and Yung-Ju Chang* (UbiComp-ISWC '20)

Effects of Activity Breakpoints on Mobile Crowdsourcing Task Performance [PDF]

Chia-En Chiang, Yung-Ju Chang*, and Felicia Feng (UbiComp-ISWC '20)

Using Gamification to Create and Label Photos that are Challenging for Computer Vision and People [PDF]

Piotr Kotlinski, Xi-Jing Chang, Yang Chih-Yun, Wei-Chen Chiu, and Yung-Ju Chang* (UbiComp-ISWC '20)

Comparing the Effects of Reference-based, Orientation-based, and Turn-by-turn navigation Guidance on Users’ Independent Navigation [PDF]

Ting-Yu Kuo, Hung-Kuo Chu, and Yung-Ju Chang* (UbiComp-ISWC '20)

A Preliminary Investigation of the Mismatch between Attendance Order and Desired Display Order of Smartphone Notifications [PDF]

Tzu-Chieh Lin, Yu-Shao Su, Emily Yang, Yun Han Chen, Hao-Ping Lee, and Yung-Ju Chang* (UbiComp-ISWC '20)

A Preliminary Study of an Intelligent System Facilitating Selective Notification Attendance on Smartphones via Alert Assistance [PDF]

Yi-Hao Shih, Tang-Jie Chang, Jian-Hua Jiang Chen, Hao-Ping Lee, and Yung-Ju Chang* (UbiComp-ISWC '20)

Exploring the Presentation of Estimated Receptivity Status for Instant Messaging [PDF]

Ting-Wei Wu, Yu-Ling Chien, and Yung-Ju Chang* (MobileHCI '20 EA)

BusMyFriend: Designing a Bus Reservation Service for People with Visual Impairments in Taipei [PDF]

Carolyn Yu, Yee Li, Tsai-Yuan Huang, Wei-An Hsieh, Shao-Yu Lee, I-Hui Yeh, Gang Ku Lin, Neng-Hao Yu*, Hsien-Hui Tang, and Yung-Ju Chang* (DIS '20 Companion)

Tourgether: Exploring Tourists’ Real-time Sharing of Experiences as a Means of Encouraging Point-of-Interest Exploration [PDF]

Yung-Ju Chang*, Chu-Yuan Yang, Ying-Hsuan Kuo, Wen-Hao Cheng, Chun-Liang Yang, Fang-Yu Lin, I-Hui Yeh, Chih-Kuan Hsieh, Ching-Yu Hsieh, and Yu-Shuen Wang (IMWUT '19)