Publications
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100 W Operation of a Cold Cathode TWT
This paper reports on the experimental studies of implementation of such field emitter arrays as the electron source for a moderate power traveling wave tube (TWT) operating in the C-band…
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Coordinated Optical and Radar Image Measurements of Noctilucent Clouds and Polar Mesospheric Summer Echoes
Novel coincident 3-D radar, lidar and optical image measurements of dynamical structures in polar mesosphere summer echoes (PMSE) and noctilucent clouds (NLC) are presented.
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Pfisr Observations of Strong Azimuthal Flow Bursts in the Ionosphere and Their Relation to Nightside Aurora
We present two flow burst events observed by the new Poker Flat Advanced Modular Incoherent Scatter Radar (PFISR) in the pre-midnight auroral zone on 28 April 2007, one towards the…
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Poker Flat Radar Observations of the Magnetosphere-Ionosphere Coupling Electrodynamics of the Earthward Penetrating Plasma Sheet Following Convection Enhancements
We have used PFISR observations associated with two relatively abrupt southward turnings of the IMF to provide an initial evaluation of aspects of this response.
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Seasonal and Diurnal Variability of the Meteor Flux at High Latitudes Observed Using PFISR
Latitudinal and seasonal variability of the micrometeor input function: A study using model predictions and observations from Arecibo and PFISR.
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Inside events in progress
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Signpost from the masses: learning effects in an exploratory social tag search browser
In this paper, we present the design of a tag-based exploratory system and detail an experiment in understanding its effectiveness.
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Remembrance of things tagged: How tagging effort affects tag production and human memory
We developed a low-effort interaction method called Click2Tag for social bookmarking. Information foraging theory predicts that the production of tags in will increase as the effort required to do so…
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Annotate once, appear anywhere: collective foraging for snippets of interest using paragraph fingerprinting
In this paper we report how we explore the idea of paragraph fingerprinting to achieve the goal of annotate once, appear anywhere in a social annotation system called SparTag.us.
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Using temporal patterns (T-Patterns) to derive stress factors of routine tasks
We describe the use of a statistical technique called T-pattern analysis to derive and characterize the routineness of tasks.
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With a little help from my friends: examining the impact of social annotations in sensemaking tasks
This paper presents a laboratory study aimed at evaluating the learning effect of social features in SparTag.us.
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What’s in Wikipedia? mapping topics and conflict using socially annotated category structure
In this paper we develop measures to map Wikipedia using its socially annotated, hierarchical category structure.