Susumu Harada
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Publications by Susumu Harada (bibliography)
» 2009 «
Harada, Susumu, Wobbrock, Jacob O., Malkin, Jonathan, Bilmes, Jeff A. and Landay, James A. (2009): Longitudinal study of people learning to use continuous voice-based cursor control. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 347-356. Available online
“We conducted a 2.5 week longitudinal study with five motor impaired (MI) and four non-impaired (NMI) participants, in which they learned to use the Vocal Joystick, a voice-based user interface control system. We found that the participants were able to learn the mapping between the vowel sounds and directions used by the Vocal Joystick, and showed marked improvement in their target acquisition performance. At the end of the ten session period, the NMI group reached the same level of performance as the previously measured "expert" Vocal Joystick performance, and the MI group was able to reach 70% of that level. Two of the MI participants were also able to approach the performance of their preferred device, a touchpad. We report on a number of issues that can inform the development of further enhancements in the realm of voice-driven computer control.”
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Wobbrock, Jacob O., Fogarty, James, Liu, Shih-Yen (Sean), Kimuro, Shunichi and Harada, Susumu (2009): The angle mouse: target-agnostic dynamic gain adjustment based on angular deviation. In: Proceedings of ACM CHI 2009 Conference on Human Factors in Computing Systems 2009. pp. 1401-1410. Available online
“We present a novel method of dynamic C-D gain adaptation that improves target acquisition for users with motor impairments. Our method, called the Angle Mouse, adjusts the mouse C-D gain based on the deviation of angles sampled during movement. When angular deviation is low, the gain is kept high. When angular deviation is high, the gain is dropped, making the target bigger in motor-space. A key feature of the Angle Mouse is that, unlike most pointing facilitation techniques, it is target-agnostic, requiring no knowledge of target locations or dimensions. This means that the problem of distractor targets is avoided because adaptation is based solely on the user's behavior. In a study of 16 people, 8 of which had motor impairments, we found that the Angle Mouse improved motor-impaired pointing throughput by 10.3% over the Windows default mouse and 11.0% over sticky icons. For able-bodied users, there was no significant difference among the three techniques, as Angle Mouse throughput was within 1.2% of the default. Thus, the Angle Mouse improved pointing performance for users with motor impairments while remaining unobtrusive for able-bodied users.”
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» 2008 «
Wobbrock, Jacob O., Cutrell, Edward, Harada, Susumu and MacKenzie, I. Scott (2008): An error model for pointing based on Fitts' law. In: Proceedings of ACM CHI 2008 Conference on Human Factors in Computing Systems April 5-10, 2008. pp. 1613-1622. Available online
“For decades, Fitts' law (1954) has been used to model pointing time in user interfaces. As with any rapid motor act, faster pointing movements result in increased errors. But although prior work has examined accuracy as the "spread of hits," no work has formulated a predictive model for error rates (0-100%) based on Fitts' law parameters. We show that Fitts' law mathematically implies a predictive error rate model, which we derive. We then describe an experiment in which target size, target distance, and movement time are manipulated. Our results show a strong model fit: a regression analysis of observed vs. predicted error rates yields a correlation of R{sup:2}=.959 for N=90 points. Furthermore, we show that the effect on error rate of target size (W) is greater than that of target distance (A), indicating a departure from Fitts' law, which maintains that W and A contribute proportionally to index of difficulty (ID). Our error model can be used with Fitts' law to estimate and predict error rates along with speeds, providing a framework for unifying this dichotomy.”
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Harada, Susumu, Lester, Jonathan, Patel, Kayur, Saponas, T. Scott, Fogarty, James, Landay, James A. and Wobbrock, Jacob O. (2008): VoiceLabel: using speech to label mobile sensor data. In: Digalakis, Vassilios, Potamianos, Alexandros, Turk, Matthew, Pieraccini, Roberto and Ivanov, Yuri (eds.) Proceedings of the 10th International Conference on Multimodal Interfaces - ICMI 2008 October 20-22, 2008, Chania, Crete, Greece. pp. 69-76. Available online
» 2007 «
Harada, Susumu, Wobbrock, Jacob O. and Landay, James A. (2007): Voicedraw: a hands-free voice-driven drawing application for people with motor impairments. In: Ninth Annual ACM Conference on Assistive Technologies 2007. pp. 27-34. Available online
“We present VoiceDraw, a voice-driven drawing application for people with motor impairments that provides a way to generate free-form drawings without needing manual interaction. VoiceDraw was designed and built to investigate the potential of the human voice as a modality to bring fluid, continuous direct manipulation interaction to users who lack the use of their hands. VoiceDraw also allows us to study the issues surrounding the design of a user interface optimized for non-speech voice-based interaction. We describe the features of the VoiceDraw application, our design process, including our user-centered design sessions with a 'voice painter', and offer lessons learned that could inform future voice-based design efforts. In particular, we offer insights for mapping human voice to continuous control.”
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Everitt, Katherine, Harada, Susumu, Bilmes, Jeff A. and Landay, James A. (2007): Disambiguating speech commands using physical context. In: Massaro, Dominic W., Takeda, Kazuya, Roy, Deb and Potamianos, Alexandros (eds.) Proceedings of the 9th International Conference on Multimodal Interfaces - ICMI 2007 November 12-15, 2007, Nagoya, Aichi, Japan. pp. 247-254. Available online
Harada, Susumu, Saponas, T. Scott and Landay, James A. (2007): Voicepen: augmenting pen input with simultaneous non-linguisitic vocalization. In: Massaro, Dominic W., Takeda, Kazuya, Roy, Deb and Potamianos, Alexandros (eds.) Proceedings of the 9th International Conference on Multimodal Interfaces - ICMI 2007 November 12-15, 2007, Nagoya, Aichi, Japan. pp. 178-185. Available online
» 2006 «
Harada, Susumu, Landay, James A., Malkin, Jonathan, Li, Xiao and Bilmes, Jeff A. (2006): The vocal joystick: evaluation of voice-based cursor control techniques. In: Eighth Annual ACM Conference on Assistive Technologies 2006. pp. 197-204. Available online
“Mouse control has become a crucial aspect of many modern day computer interactions. This poses a challenge for individuals with motor impairments or those whose use of hands are restricted due to situational constraints. We present a system called the Vocal Joystick which allows the user to continuously control the mouse cursor by varying vocal parameters such as vowel quality, loudness and pitch. A survey of existing cursor control methods is presented to highlight the key characteristics of the Vocal Joystick. Evaluations were conducted to characterize expert performance capability of the Vocal Joystick, and to compare novice user performance and preference for the Vocal Joystick and two other existing speech based cursor control methods. Our results show that Fitts' law is a good predictor of the speedaccuracy tradeoff for the Vocal Joystick, and suggests that the optimal performance of the Vocal Joystick may be comparable to that of a conventional hand-operated joystick. Novice user evaluations show that the Vocal Joystick can be used by people without extensive training, and that it presents a viable alternative to existing speech-based cursor control methods.”
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» 2004 «
Paepcke, Andreas, Wang, Qianying, Patel, Sheila, Wang, Matthew and Harada, Susumu (2004): A cost-effective three-in-one personal digital assistant input control. In International Journal of Human-Computer Studies, 60 (5) pp. 717-736
“We attach an inexpensive pressure sensor to the side of a personal digital
assistant and use it as three input devices at once. Users can squeeze the
device to provide near-continuous input to applications. At the same time the
drivers interpret a sudden full squeeze as the push of a virtual button. A
user's sudden pressure release while squeezing is detected as the push of a
second virtual button. We briefly describe our hardware and signal processing
techniques. The remainder of the writing describes an experiment that explores
whether users can cope cognitively with the 3-in-1 control. We compare against
a three-control setup consisting of a jog wheel and two physical buttons. We
show that the three-in-one control enables a 13% faster reaction time over the
three-control one, but that the three-in-one control suffers a 4% penalty in
the accuracy of users choosing between the two buttons in response to cues from
an application. We show that a good choice of application cue is more important
for assuring accuracy in the 3-in-1 than in the more traditional set of
separate controls.”
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Harada, Susumu, Naaman, Mor, Song, Yee Jiun, Wang, Qianying and Paepcke, Andreas (2004): Lost in memories: interacting with photo collections on PDAs. In: JCDL04: Proceedings of the 4th ACM/IEEE-CS Joint Conference on Digital Libraries 2004. pp. 325-333. Available online
“We developed two browsers to support large personal photo collections on PDAs. Our first browser is based on a traditional, folder-based layout that utilizes either the user's manually created organization structure, or a system-generated structure. Our second browser uses a novel interface that is based on a vertical, zoomable timeline. This timeline browser does not require users to organize their photos, but instead, relies solely on system-generated structure. Our system creates a hierarchical structure of the user's photos by applying time-based clustering to identify subsets of photos that are likely to be related. In a user experiment, we compared users' searching and browsing performance across these browsers, using each user's own photo collection. Photo collection sizes varied between 500 and 3000 photographs Our results show that our timeline browser is at least as effective for searching and browsing tasks as a traditional browser that requires users to manually organize their photos.”
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Naaman, Mor, Harada, Susumu, Wang, Qianying, Garcia-Molina, Hector and Paepcke, Andreas (2004): Context data in geo-referenced digital photo collections. In: Schulzrinne, Henning, Dimitrova, Nevenka, Sasse, Martina Angela, Moon, Sue B. and Lienhart, Rainer (eds.) Proceedings of the 12th ACM International Conference on Multimedia October 10-16, 2004, New York, NY, USA. pp. 196-203. Available online
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Mar 21st, 2010
Changes to this page (author)
25 Feb 2010: Enabled abstracts to be shown on Susumu Harada's author page.17 Jun 2009: Author was edited 30 May 2009: Author was edited
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30 May 2009: Author was edited
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28 Apr 2003: Added the author to the bibliography
