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In comparison to multiple choice or other recognition-oriented forms of assessment, short answer questions have been shown to offer greater value for both students and teachers; for students they can improve retention of knowledge, while for teachers they provide more insight into student understanding. Unfortunately, the same open-ended nature which makes(More)
Geographically distributed collaborative teams often rely on synchronous text-based online communication for accomplishing tasks and maintaining social contact. This technology leaves a trace that can help researchers understand affect expression and dynamics in distributed groups. Although manual labeling of affect in chat logs has shed light on complex(More)
Distributed collaborative teams increasingly rely on online tools for interaction and communication in both social and task-oriented goals. Measuring and modeling these interactions along different dimensions can help understand, and better design for, distributed collaboration. Affect is one such dimension that can play a crucial role in the dynamics,(More)
Machine learning requires an effective combination of data, features, and algorithms. While many tools exist for working with machine learning data and algorithms, support for thinking of new features, or feature ideation, remains poor. In this paper, we investigate two general approaches to support feature ideation: visual summaries and sets of errors. We(More)
Widespread adoption of biometric authentication technology has been slow because of technical, usability, and acceptability issues. Incorporating feedback from stakeholders throughout the design process is one way to ensure that biometric technologies have the best chance of achieving success. Emerging technology that performs biometric identification(More)
Although laboratory user studies are the most common method for validating the utility of information visualiza-tion systems, it may be difficult to determine if such studies accurately reflect the tasks of real users. In this paper , we describe a longitudinal real-world user evaluation of a visual and interactive Web search interface designed to support(More)
TheHotMap.com is an example of a next-generation Web search interface, wherein users are able to take an active role in the Web search process. Information that can assist searchers in their Web search tasks is presented in a visual manner. The system supports user interaction both during the query refinement process, as well as the search results(More)
Researchers across many fields are increasingly using data from social media sites to address questions about individual and group social behaviors. However, the size and complexity of these data sets challenge traditional research methods; many new tools and techniques have been developed to support research in this area. In this paper, we present our(More)
Like most online content, user-generated content (UGC) poses accessibility barriers to users with disabilities. However, the accessibility difficulties pervasive in UGC warrant discussion and analysis distinct from other kinds of online content. Content authors, community culture, and the authoring tool itself all affect UGC accessibility. The choices,(More)
An approach is presented for estimating a set of interdependent homography matrices linked together by latent variables. The approach allows enforcement of all underlying consistency constraints while accounting for the arbitrariness of the scale of each individual matrix. The input data is assumed to be in the form of a set of homography matrices(More)