The Experts below are selected from a list of 104388 Experts worldwide ranked by ideXlab platform
Saul Greenberg - One of the best experts on this subject based on the ideXlab platform.
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a Usability Study of awareness widgets in a shared workspace groupware system
Conference on Computer Supported Cooperative Work, 1996Co-Authors: Carl Gutwin, Mark Roseman, Saul GreenbergAbstract:Workspace awareness is knowledge about others’ interaction with a shared workspace. Groupware systems provide only limited information about other participants, often compromising workspace awareness. This paper describes a Usability Study of several widgets designed to help maintain awareness in a groupware workspace. These widgets include a miniature view, a radar view, a multiuser scrollbar, and a “what you see is what I do” view. The Study examined the widgets’ information content, how easily people could interpret them, and whether they were useful or distracting. Experimenter observations, subject questionnaires, and interviews indicate that the miniature and radar displays are useful and valuable for tasks involving spatial manipulation of artifacts.
Gabor Fichtinger - One of the best experts on this subject based on the ideXlab platform.
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Electromagnetic tracking in surgical and interventional environments: Usability Study
International Journal of Computer Assisted Radiology and Surgery, 2015Co-Authors: Elodie Lugez, Hossein Sadjadi, David R. Pichora, Randy E. Ellis, Gabor FichtingerAbstract:Purpose Electromagnetic (EM) tracking of instruments within a clinical setting is notorious for fluctuating measurement performance. Position location measurement uncertainty of an EM system was characterized in various environments, including control, clinical, cone beam computed tomography (CBCT), and CT scanner environments. Static and dynamic effects of CBCT and CT scanning on EM tracking were evaluated. Methods Two guidance devices were designed to solely translate or rotate the sensor in a non-interfering fit to decouple pose-dependent tracking uncertainties. These devices were mounted on a base to allow consistent and repeatable tests when changing environments. Using this method, position and orientation measurement accuracies, precision, and 95 % confidence intervals were assessed. Results The tracking performance varied significantly as a function of the environment—especially within the CBCT and CT scanners—and sensor pose. In fact, at a fixed sensor position in the clinical environment, the measurement error varied from 0.2 to 2.2 mm depending on sensor orientations. Improved accuracies were observed along the vertical axis of the field generator. Calibration of the measurements improved tracking performance in the CT environment by 50–85 %. Conclusion EM tracking can provide effective assistance to surgeons or interventional radiologists during procedures performed in a clinical or CBCT environment. Applications in the CT scanner demand precalibration to provide acceptable performance.
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electromagnetic tracking in surgical and interventional environments Usability Study
Computer Assisted Radiology and Surgery, 2015Co-Authors: Elodie Lugez, Hossein Sadjadi, David R. Pichora, Randy E. Ellis, Selim G Akl, Gabor FichtingerAbstract:Purpose Electromagnetic (EM) tracking of instruments within a clinical setting is notorious for fluctuating measurement performance. Position location measurement uncertainty of an EM system was characterized in various environments, including control, clinical, cone beam computed tomography (CBCT), and CT scanner environments. Static and dynamic effects of CBCT and CT scanning on EM tracking were evaluated.
Carl Gutwin - One of the best experts on this subject based on the ideXlab platform.
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a Usability Study of awareness widgets in a shared workspace groupware system
Conference on Computer Supported Cooperative Work, 1996Co-Authors: Carl Gutwin, Mark Roseman, Saul GreenbergAbstract:Workspace awareness is knowledge about others’ interaction with a shared workspace. Groupware systems provide only limited information about other participants, often compromising workspace awareness. This paper describes a Usability Study of several widgets designed to help maintain awareness in a groupware workspace. These widgets include a miniature view, a radar view, a multiuser scrollbar, and a “what you see is what I do” view. The Study examined the widgets’ information content, how easily people could interpret them, and whether they were useful or distracting. Experimenter observations, subject questionnaires, and interviews indicate that the miniature and radar displays are useful and valuable for tasks involving spatial manipulation of artifacts.
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CHI Conference Companion - A Usability Study of workspace awareness widgets
Conference companion on Human factors in computing systems common ground - CHI '96, 1996Co-Authors: Carl Gutwin, Mark RosemanAbstract:Groupware systems that use large shared workspaces generally provide only limited awareness information about other collaborators in the workspace. We are designing a set of groupware widgets to provide this missing information. This paper describes a Usability Study of a number of such widgets. The Study has both validated our intuitions about the need for workspace awareness information, and revealed the strengths and weaknesses of several current designs.
Ruba Aljafari - One of the best experts on this subject based on the ideXlab platform.
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A Usability Study of the obamacare website: Evaluation and recommendations
Government Information Quarterly, 2017Co-Authors: Viswanath Venkatesh, Hartmut Hoehle, Ruba AljafariAbstract:We conducted a Usability Study of the healthcare.gov website, popularly known as the Obamacare website, using the guidelines available on Usability.gov, which were published by the Department of Health and Human Services. The Study was conducted among 374 citizens. We found that the interface design, which we conceptualized as 16 dimensions, was rated rather low. Specifically, five dimensions of Usability emerged as key to the prediction of overall Usability of the website: hardware and software, home page, screen, scrolling and paging, and user experience. We also found that citizen satisfaction and intention to use the website were rated poorly. Based on a break down by gender, age and voting behavior (for Obama or not), we found several interesting patterns of differences. Ultimately, even if the infrastructure issues that have received a bulk of the media attention are miraculously resolved, our findings suggest that the site will be found wanting. The article offers specific illustrative examples of Usability problems with the website and specific recommendations drawn from Usability.gov. In addition to the practical implications for Obamacare, the article offers significant implications for researchers who seek to evaluate the Usability of websites in general and healthcare websites in particular.
Jessica Petrey - One of the best experts on this subject based on the ideXlab platform.
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An Exploration of a Website Design Process and Results of a Usability Study.
Medical reference services quarterly, 2019Co-Authors: Lauren E Robinson, Jessica PetreyAbstract:A transition of content management systems provided Kornhauser Health Sciences Library with an opportunity to redesign the library's website to be more user-friendly, efficient, and visually appealing. A multistage approach was taken: (1) informal interviews of various stakeholders from the library, (2) a redesign using information gained from those stakeholders, and (3) a retrospective comparative Usability Study. This Study was conducted with the goal to inform library staff whether the redesigned website improved accuracy and efficiency of information retrieval through the completion of timed tasks. In addition, user satisfaction was measured through guided interview questions.
