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In this paper, we discuss how event processing technologies can be employed for real-time text stream processing and information filtering in the context of the TREC 2012 microblog task. After introducing basic characteristics of stream and event processing, the technical architecture of our text stream analysis engine is presented. Employing well-known term weighting schemes from document-centric text retrieval for temporally dynamic text streams is discussed next, giving details of the ESPER Event Processing Agents (EPAs) we have implemented for this task. Finally, we describe our experimental setup, give details on the TREC microblog runs as well as the result thereafter with our system including some extensions and give a short interpretation of the evaluation results., Presented at the Text REtrieval Conference (TREC 2012) (21st) held in Gaithersburg, Maryland on 6-9 November 2012. The conference was co-sponsored by the National Institute of Standards and Technology (NIST) the Defense Advanced Research Projects Agency (DARPA) and the Advanced Research and Development Activity (ARDA).

This article is from ADA408025 Nanostructures: Physics and Technology International Symposium (9th), St. Petersburg, Russia, June 18-22, 2001 Proceedings

This article is from ADA408025 Nanostructures: Physics and Technology International Symposium (9th), St. Petersburg, Russia, June 18-22, 2001 Proceedings

We report on a novel detector for THz radiation. It consists of a GaAs/AlAs superlattice mesa device mounted in a corner cube antenna system. The detector shows a current-voltage characteristic with a negative differential conductance. Under the influence of THz radiation, the dc current through the superlattice mesa is reduced; this is caused by a THz field-induced modulation of Bloch oscillating miniband electrons in the superlattice. A fast detector response (several tenth of picoseconds, limited by the electronics) and a high responsivity is demonstrated in a frequency range 0.7-7 THz., Prepared in cooperation with GMM, VDE/VDE-Gesellschaft Mikroelektronik, Mikro- und Feinwerktechnik; ITS, Informationstechnische Gesellschaft im VDE. This article is from the THz Conference 2000 pp91-93. This article is from ADA398789 International Conference on Terahertz Electronics (8th), Held in Darmstadt, Germany on 28-29 September 2000

Wide miniband superlattice devices are suitable for generation detection and frequency multiplication of microwaves and for detection and autocorrelation of THz radiation. The devices. operated at room temperature, are based on nonlinear transport properties of the miniband electrons. While the interaction of the miniband electrons with microwaves can be described by the nonlinear current-voltage characteristic, interaction with a THz field is based on a quantum nonlinearity. namely a THz-field induced modulation of the Bloch oscillations of the miniband electrons., Pres: 7th Int Symp Nanostructures: Physics and Technology, St Petersburg, Russia. 14-18 Jun 1999. p444-449. This article is from ADA407055 Nanostructures: Physics and Technology. 7th International Symposium. St. Petersburg, Russia, June 14-18, 1999 Proceedings

This article is from 'Organization of the Optical Society of America Photonic Science Topical Meeting Series (1991). Volume 16. Conference Edition: Summaries of papers presented at the Persistent Spectral Hole-Burning: Science and Applications Topical Meeting Held in Monterey, California on 26-28 September 1991', AD-A258 663, p248-251.

We studied the effects of an external electric field on persistent spectral holes in an inhomogeneously broadened optical transition of dye molecules embedded in crystalline or disordered solids. The results are applied to optical data storage in the electric field dimension, modulation and pulse forming of laser beams, and hybrid optical bistability., This article is from 'Organization of the Optical Society of America Photonic Science Topical Meeting Series (1991). Volume 16. Conference Edition: Summaries of papers presented at the Persistent Spectral Hole-Burning: Science and Applications Topical Meeting Held in Monterey, California on 26-28 September 1991', AD-A258 663, p56-59.