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共 110 条记录，以下是61-70 订阅

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Android application development to promote physical activity in adolescents

Android application development to promote physical activity...

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International Symposium on Collaborative technologies and Systems

作者： Darryl Clark Clarence Edmonds Antonio Moore Julee Harlow Kacie Allen Woodrow W. Winchester D. Scott McCrickard Paul Estabrooks Department of Computer Science Norfolk State University Norfolk VA USA Center for Human Computer Interaction Virginia Tech Blacksburg VA USA

Adolescents in today's society are becoming increasingly less active, contributing to a rising obesity rate. With this epidemic as motivation, and the use of smart phones by youth as opportunity, a suite of Androi... 详细信息

关键词： Color Games Mobile communication Smart phones Obesity Usability

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Effects of navigation design on Contextualized Video Interfaces

Effects of navigation design on Contextualized Video Interfa...

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IEEE Symposium on 3D User Interfaces

作者： Wang, Yi Bowman, Doug A. Dept. of Computer Science Center for Human-Computer Interaction Virginia Tech United States

ISBN: (纸本)9781457700620

Real-time monitoring and responding to events observed across multiple surveillance cameras can pose an overwhelmingly high mental workload. Contextualized Video Interfaces (which place the surveillance videos within their spatial context) can be used to support these tasks. In order for users to integrate information from the videos and the spatial context as the events progress in real time, navigation interfaces are required. However, different tasks seem to favor different navigation techniques. In this paper, we describe the formal evaluation of four navigation designs for Contextualized Video Interfaces. The four designs arise from the consideration of two important factors of navigation techniques: navigation mode (manual or semi-automatic) and navigation context (overview or detailed view). To avoid a piecemeal understanding of the navigation techniques, we evaluated them using three tasks that have different information requirements. While semi-automatic navigation was generally preferable, low-DOF manual navigation techniques were found to be useful in certain situations. The choice between overview navigation and detailed-view navigation depends primarily on the user's information requirement in the task. Based on the findings, we provide guidelines on how to select designs according to task features. © 2011 IEEE.

关键词： Navigation

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Building blocks: A novel metaphor for solving 3D puzzles

Building blocks: A novel metaphor for solving 3D puzzles

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IEEE Symposium on 3D User Interfaces

作者： Bacim, Felipe Stinson, Cheryl Laha, Bireswar Bowman, Doug A. Dept. of Computer Science Center for Human-Computer Interaction Virginia Tech United States

ISBN: (纸本)9781457700620

This paper presents our team's design and implementation of an innovative solution to solve the challenge proposed by the 3DUI Contest, which consisted of creating a 3DUI to solve simple 3D puzzles. Rather than using a direct manipulation technique to handle placement of the puzzle pieces, such as the virtual hand, we designed an innovative technique based on build. We aimed to provide a fun and intuitive way to solve puzzles that is not possible in the physical world. Rather than having to focus on specific pieces one at a time, users instead build pieces from individual building blocks, allowing them to focus on the structure of the puzzle space. The results of a user study showed that this system provides a fun and engaging experience for both novices and experts. We believe that performance was determined primarily by experience with games and 3D puzzles rather than by 3DUI design. © 2011 IEEE.

关键词： 3D interaction 3DUI Contest Building blocks Metaphor Solve Use Studies

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Rapid and accurate 3D selection by progressive refinement

Rapid and accurate 3D selection by progressive refinement

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IEEE Symposium on 3D User Interfaces

作者： Kopper, Regis Bacim, Felipe Bowman, Doug A. Dept. of Computer Science Center for Human-Computer Interaction Virginia Tech United States

ISBN: (纸本)9781457700620

Issues such as hand and tracker jitter negatively affect user performance with the ray-casting selection technique in 3D environments. This makes it difficult for users to perform tasks that require them to select objects that have a small visible area, since small targets require high levels of precision. We introduce an approach to address this issue that uses progressive refinement of the set of selectable objects to reduce the required precision of the task. We present a design space of progressive refinement techniques and an exemplar technique called Sphere-casting refined by QUAD-menu (SQUAD). We explore the tradeoffs between progressive refinement and immediate selection techniques in an evaluation comparing SQUAD to ray-casting. Both an analytical evaluation based on a distal pointing model and an empirical evaluation demonstrate that progressive refinement selection can be better than immediate selection. SQUAD was much more accurate than ray-casting, and SQUAD was faster than ray-casting with small targets and less cluttered environments. © 2011 IEEE.

关键词： 3D interaction 3D selection distal pointing progressive refinement Ray tracing Refining required precision

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3D sketching using interactive fabric for tangible and bimanual input

3D sketching using interactive fabric for tangible and biman...

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37th Graphics Interface Conference, GI 2011

作者： Leal, Anamary Schaefer, Laurel Bowman, Doug Quek, Francis Stiles, Clarissa Center for Human-Computer Interaction Virginia Tech. United States Computer Science Department Virginia Tech. United States

ISBN: (纸本)9781450306935

As an input device, fabric holds potential benefits for three dimensional (3D) interaction in the domain of surface design, which includes designing objects from clothing to metalwork. To investigate these benefits, we conducted an exploratory study of different users' natural interactions with fabric. During this study, we instructed users to communicate various shapes and surfaces of varying complexity. A prevailing way of communicating shapes proved to be an in-the-air sketch metaphor. Based on this result, we proposed and implemented a system supporting three in-the-air sketch-based input devices: a point, a flexible curve, and a flexible surface. A preliminary feasibility study found that users successfully sketched objects and scenes despite the influence of tracking issues, suggesting lessons learned and relevant constraints for such systems in future work. Copyright held by authors.

关键词： Graphical user interfaces

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Don't drop it! Pick it up and storyboard 11

Don't drop it! Pick it up and storyboard

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Proceedings of the SIGCHI Conference on human Factors in Computing Systems

作者： Wahid, Shahtab McCrickard, D. Scott DeGol, Joseph Elias, Nina Harrison, Steve Center for Human-Computer Interaction Virginia Tech. Blacksburg VA United States Dept. of Computer Science and Engineering Pennsylvania State University University Park PA United States Dept. of Writing Rhetoric and American Culture Michigan State University East Lansing MI United States

ISBN: (纸本)9781450302289

Storyboards offer designers a way to illustrate a narrative. Their creation can be enabled by tools supporting sketching or widget collections. As designers often incorporate previous ideas, we contribute the notion of blending the reappropriation of artifacts and their design tradeoffs with storyboarding. We present PIC-UP, a storyboarding tool supporting reappropriation, and report on two studies - a long-term investigation with novices and interviews with experts. We discuss how it may support design thinking, tailor to different expertise levels, facilitate reappropriation during storyboarding, and assist with communication. Copyright 2011 ACM.

关键词： Blending

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Investigating the relationship between imagery and rationale in design 10

Investigating the relationship between imagery and rationale...

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Proceedings of the 8th ACM Conference on Designing Interactive Systems

作者： Wahid, Shahtab Branham, Stacy M. McCrickard, D. Scott Harrison, Steve Center for Human-Computer Interaction Department of Computer Science Virginia Tech. Blacksburg VA 24060 United States

ISBN: (纸本)9781450301039

Artifacts can be used to inspire, guide, and create new designs. As approaches to design can range from focusing on inspiration to formalized reasoning, we seek to create and study artifacts that combine the use of images and rationale. In this paper, we contribute an understanding of the relationship between imagery and rationale through an investigation of an artifact made of both. Through a study of group design sessions, we find images can provide access to rationale, moments of inspiration can be balanced with rationale, and differences between images and rationale must be reconciled. We conclude with thoughts on how such artifacts might be leveraged by the design community. © 2010 ACM.

关键词： imagery design artifact rationale

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Higher levels of immersion improve procedure memorization performance 15

Higher levels of immersion improve procedure memorization pe...

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Joint Virtual Reality Conference of the 15th Eurographics Symposium on Virtual Environments, EGVE 2009, 19th International Conference on Artificial Reality and Telexistence, ICAT 2009 and 6th EuroVR ,INTUITION Conference, EuroVR 2009

作者： Bowman, D.A. Sowndararajan, A. Ragan, E.D. Kopper, R. Virginia Center for Human-Computer Interaction Dept. of Computer Science Virginia Tech United States

ISBN: (纸本)9783905674200

Researchers have proposed that immersion could have advantages for tasks involving abstract mental activities, such as conceptual learning;however, there are few empirical results that support this idea. We hypothesized that higher levels of immersion would benefit such tasks if the mental activity can be mapped to objects or locations in a 3D environment. To investigate this hypothesis, we performed an experiment in which participants memorized procedures in a virtual environment and then attempted to recall those procedures. We aimed to understand the effects of three components of immersion on performance. Results demonstrate that a matched software field of view (SFOV), a higher physical FOV, and a higher field of regard (FOR) all contributed to more effective memorization. The best performance was achieved with a matched SFOV and either a high FOV or a high FOR, or both. In addition, our experiment demonstrated that memorization in a virtual environment could be transferred to the real world. The results suggest that, for procedure memorization tasks, increasing the level of immersion even to moderate levels, such as those found in head-mounted displays (HMDs) and display walls, can improve performance significantly compared to lower levels of immersion. © The Eurographics Association 2009.

关键词： Virtual reality

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Enabling opportunistic navigation in location-based notification systems

Enabling opportunistic navigation in location-based notifica...

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2nd International Conferences on Advances in computer-human interactions, ACHI 2009

作者： Kelly, Scott Hood, Ben Lee, Jason Chong Sampat, Miten Lally, Leigh McCrickard, D. Scott Department of Computer Science Center for Human Computer Interaction Virginia Tech. Blacksburg VA United States

ISBN: (纸本)9780769535296

Device-assisted navigation is rapidly becoming a major topic in computer science. PDAs and other small devices are enabling the introduction of navigational assistants to many different spaces. These areas are generally filled with points of interest with which users may choose to interact with. The natural behavior of users in such a space is to explore, interacting with objects the user deems worthy of further interaction. We call this behavior 'opportunistic navigation.' In this paper we define the challenges associated with and put forward several criteria for enabling opportunistic navigation in Location-Based Notification Systems. Our criteria have been implemented in the form of a prototype navigational assistant, SeeVT-ART, and have undergone a preliminary field test. © 2009 IEEE.

关键词： Navigation

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Body-based interaction for desktop games

Body-based interaction for desktop games

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27th International Conference Extended Abstracts on human Factors in Computing Systems, CHI 2009

作者： Silva, Mara G. Bowman, Doug A. Center for Human-Computer Interaction Department of Computer Science Virginia Tech. 2202 Kraft Drive Blacksburg VA 24060 United States

ISBN: (纸本)9781605582474

interaction for desktop games is mostly limited to keyboard and mouse input. We are investigating the benefits of adding body-based interaction to complement keyboard and mouse interaction in desktop gaming. We present a proof-of-concept implementation of body-based navigation for the game World of Warcraft, and a formative evaluation to test the feasibility of this kind of interaction. Our observations provide evidence that body-based interaction in addition to keyboard and mouse can help players perform more tasks at the same time and can be especially attractive and helpful to new players. Our study also revealed design consideration for this type of interaction.

关键词： Mammals

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