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Abowd, Gregory D.

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Author: Brotherton, Jason Alan × End date: 1999 × Start date: 1994 ×

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Now showing 1 - 4 of 4
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    A Scalable Workload Model of Media-Enhanced Classrooms
    (Georgia Institute of Technology, 1999) Chervenak, Ann L. ; Vellanki, Vivekanand ; Yanasak, Ivan ; Harel, Nissim ; Rodenstein, Roy ; Abowd, Gregory D. ; Brotherton, Jason Alan ; Ramachandran, Umakishore
    We present a scalable workload model for media-enhanced classrooms. Such classrooms include equipment for presenting multimedia streams and for capturing streams of information (audio, video and notes) during a lecture. Our model characterizes the workload of a centralized or distributed server that supports multiple classrooms. The workload includes server bandwidth, network bandwidth and server storage requirements. Using our workload model, we present detailed performance measurements of one media-enhanced classroom system, Classroom 2000. We identify patterns in user behavior, and demonstrate that the number of simultaneous study sessions varies with time of day according to a beta distribution. In addition, we model the total number of study sessions on a particular day using a simple linear model that depends on proximity to midterm and final examinations. Finally, we use the model to predict how the capabilities of a Classroom 2000 server must scale to support hundreds of classrooms and thousands of students.
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    Supporting Capture and Access Interfaces for Informal and Opportunistic Meetings
    (Georgia Institute of Technology, 1999) Brotherton, Jason Alan ; Abowd, Gregory D. ; Truong, Khai Nhut
    Automated support for the capture and access of live experiences is a common theme for ubiquitous computing. For certain capture situations, such as informatl or opportunistic gatherings, existing capture framesworks are inadequate for a number of reasons. They require too much time to initiate a capture session and they often are too inflexible to support unstructured and impromptu use. In this paper, we present a whiteboard capture application called DUMMBO, aimed to support opportunistic and serendipitous meeting capture. We emphasize an easy-to-initiate interface that mirrors as much as possible traditional whiteboard functionality. This is accompanied by visualization techniques for accessing captured meetings afterwards. By separating the physical interface for capture from the electronic interface for accessing captured meetings, we demonstrate how a capture and access application can be designed to better support its intended audience.
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    A Multi-Scale Timeline Slider for Stream Visualization and Control
    (Georgia Institute of Technology, 1999) Richter, Heather Anne ; Brotherton, Jason Alan ; Abowd, Gregory D. ; Truong, Khai Nhut
    We present a new user interface technique for the visualization and playback of long media streams decorated with significant events. Our Multi-Scale Timeline Slider allows users to precisely focus on a specific location in a very long media stream or set of streams based on significant events while also retaining the stream's entire context.
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    Context-Awareness in Wearable and Ubiquitous Computing
    (Georgia Institute of Technology, 1997) Abowd, Gregory D. ; Dey, Anind K. ; Orr, Robert J. ; Brotherton, Jason Alan
    A common focus shared by researchers in mobile, ubiquitous and wearable computing is the attempt to break away from the traditional desktop computing paradigm. Computational services need to become as mobile as their users. Whether that service mobility is achieved by equipping the user with computational power or by instrumenting the environment, all services need to be extended to take advantage of the constantly changing context in which they are accessed. This paper will report on work done in the Future Computing Environments Group at Georgia Tech to provide infrastructure for context-aware computing. We will describe some of the fundamental issues involved in context-aware computing, solutions we have generated to provide a flexible infrastructure and several applications that take advantage of context awareness to allow freedom from traditional desktop computing.