P. Castro, P. Chiu, T. Kremenek, and R. Muntz. A Probabilistic Room Location Service for Wireless Networked Environments. In Proc. 3rd Int. Conf. on Ubiquitous Computing (UBICOMP-2001.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....the pervasive computing community a number of schemes have been used to obtain the physical location of computers. In outdoors environments GPS (Global Positioning System) and GSM cell information has been used to obtain location information. Indoors, wireless LAN signal strength [BP00, SSA 01, CCKM01] has been used as has combined radio and ultrasonic beacons [PCB00] pure ultrasonic beacons (Bat) and pure radio systems. Even bar codes or radio tags can be used to detect when people or computers enter leave rooms. A good overview of the technologies is given in [HB01] The OpenLSD framework ....

....brother location server as above: locations obtained are not reported back to our location service, nor can clients query the location mapper service for locations of other computers. Several papers have explored how to get more precise location information from a wireless LAN [BP00, SSA 01, CCKM01] Using their methods we could obtain more precise location information for wireless laptops without contacting a central location service. In [JS02] Jiang and Steenkiste propose the ALI URL format for representing locations. It is a hybrid of hierarchical location names and Euclidean ....

Paul Castro, Patrick Chiu, Ted Kremenek, and Richard Muntz. A probabilistic room location service for wireless networked environments. In G.D. Abowd, B. Brumitt, and S. Shafer, editors, Ubicomp 2001: Ubiquitous Computing, volume 2201 of LNCS, page 18ff, Atlanta, Georgia, September 2001. Springer-Verlag.

....Microsoft research, pre computes an SNR map for a building. The vector of signal strengths received at various base stations is compared to the map to determine position. Other interesting RF based systems include SpotON [14] which is designed for three dimensional location detection, and Nibble [15], a probabilistic location detection system developed at the University of California, Los Angeles. Nibble improves performance by incorporating a Bayesian model for predicting the likely origin of a signal 5 based on signal quality observed at access points. As with the previously mentioned ....

Paul Castro, Patrick Chiu, Ted Kremenek, and Richard R. Muntz, \A probabilistic room location service for wireless networked environments, " in Ubicomp, Atlanta, GA, 2001, ACM. 25

....Microsoft research, pre computes an SNR map for a building. The vector of signal strengths received at various base stations is compared to the map to determine position. Other interesting RF based systems include SpotON [14] which is designed for three dimensional location detection, and Nibble [15], a probabilistic location detection system developed at the University of California, Los Angeles. Nibble improves performance by incorporating a Bayesian model for predicting the likely origin of a signal based on signal quality observed at access points. As with the previously mentioned ....

Paul Castro, Patrick Chiu, Ted Kremenek, and Richard R. Muntz, "A probabilistic room location service for wireless networked environments, " in Ubicomp, Atlanta, GA, 2001, ACM.

.... (GPS) used very successfully in open areas but ineffective indoor, there are several indoor location techniques such as Active Badge[19] using infrared signals, Active Bat[20, 9] Cricket[16] using a combination of RF and ultrasound to estimate the distance, PinPoint 3D iD[21] RADAR[2] Nibble[6] and SpotON[10] using RF based location determination. The current paper considers a high speed wireless LAN environment using the IEEE 802.11b standard. The method is based on neural network models and automated learning techniques. As it is the case for the RADAR system, no special purpose ....

P. Castro, P. Chiu, T. Kremenek, and R. Muntz. A probabilistic room location service for wireless networked environments. In Ubicomp 2001: Ubiquitous Computing, pages 18--34. Springer, 2001.

....a real world physical quantity, and using it to calculate or infer a position estimate. The data can be gathered via a number of physical media; previously developed location systems have used infrared light [2, 3, 4] visible light [5, 6] ultrasound [7, 8, 9] and wireless LAN based radio [10, 11]. The desirable property of ultrasonic location systems is that they have the capability to be fine grained, meaning they can estimate location with a high degree of resolution. This is because the speed of ultrasound in air is sufficiently slow to allow the time offlight of a signal to be ....

Paul Castro, Patrick Chiu, Ted Kremenek, and Richard Muntz. A probabilistic room location service for wireless networked environments. In Proceedings of Ubicomp 2001.

....on theus##O behalf, itis esO5 tial thatapplications havesW means by which to judge the reliability of the information. Forthis reas(W we incorporatemeas#V) of information quality into our model of context. The need toaddres the varying quality of context informationhas been widely recognized [14,15,12,11,7], yet none of theexis WV workaddresWF the problem in an adequate or general way. Dey et al..s.#O ( that ambiguous information can beres # ed by a mediation pro ces involving the us# [15] However, cons #(#zW the potentially large quantities of context information involved in pervas# e computing ....

.... Ebling et al. desW)5 e a contextsxt##V that allows context information to beasV ciated with qualitymetrics st h as fres)W#z and confidence [12] but their model of context is incomplete and lacks formality.Cas(V et al. have a well defined notion of qualitybasF onmeas( of accuracy and confidence [14], but their workconsO( only location information. Schmidt et al. as# ciate each of their context values with a certaintymeasW thatcaptures the likelihood that the value accurately reflects reality [7] They are concerned only withsth#O context information, and moreover take a rather narrow view ....

Castro, P., Chiu, P., Kremenek, T., Muntz, R.: A probabilistic room location service for wireless networked environments. I. UbiComp 2001 Conference, Atlanta (2001)

....the highlight color of the matching region. See Fig. 1. Documents are faded to indicate how relevant their space and time attributes are to the selected regions and time intervals. One factor affecting relevance comes from sensor uncertainty when automatic location detection systems are used (see [2]) A relevance score incorporates location uncertainty together with how far the time attribute is from the time coordinate of the map. Normalizing the relevance score between 0.0 and 1.0 yields the alpha value for fading. As shown in Fig. 1, the upper left photo is noticeably faded. Multiple ....

....times and places than with madeup filenames and hierarchical directories. Our plan is to deploy the SpaceTime Browser and learn more about the effectiveness of this technique, beginning with multimedia content created by digital cameras and documents captured in different rooms and times ( 1] [2], 3] As information appliances become ubiquitous and locationaware [7] new techniques such as interactive space time maps will be helpful to manage the mass of data. 5. ....

Castro, P., Chiu, P., Kremenek, T., Muntz, R. A probabilistic room location service for wireless networked environments. Proceedings of Ubicomp '01, pp. 18-34.

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P. Castro, P. Chiu, T. Kremenek, and R. Muntz. A Probabilistic Room Location Service for Wireless Networked Environments. In Proc. 3rd Int. Conf. on Ubiquitous Computing (UBICOMP-2001.

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Castro, P., Chiu, P., Kremenek, T., and Muntz, R., 2001, A Probabilistic room location service for wireless networked environments, in: Proc. 3rd Int. Conf. on Ubiquitous Computing (UBICOMP-2001), Atlanta.

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P. Castro, P. Chiu, T. Kremenek, and R. Muntz. A Probabilistic Room Location Service for Wireless Networked Environments. In Proc. 3rd Int. Conf. on Ubiquitous Computing (UBICOMP-2001.

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Castro, P., Chiu, P., Kremenek, T., and Muntz, R., 2001, A Probabilistic room location service for wireless networked environments, in: Proc. 3rd Int. Conf. on Ubiquitous Computing (UBICOMP-2001), Atlanta.

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Castro, P., Chiu, P., Kremenek, T. and Muntz, R., A probabilistic room location service for wireless networked environments. in UbiComp 2001, (2001), 18-34.

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Paul Castro, Patrick Chiu, Ted Kremenek, and Richard Muntz. A Probabilistic Room Location Service for Wireless Networked Environments. In Proceedings of the Third International Conference on Ubiquitous Computing, pages 18--34, Atlanta, GA, September-October 2001. Springer-Verlag.

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Paul Castro, Patrick Chiu, Ted Kremenek, and Richard Muntz. A Probabilistic Room Location Service for Wireless Networked Environments. In Proceedings of the Third International Conference on Ubiquitous Computing, pages 18--34, Atlanta, GA, September-October 2001. Springer-Verlag.

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Castro, P., Chiu, P., Kremenek, T., and Muntz, R. A Probabilistic Room Location Service for Wireless Networked Environments In Abowd, G.D., Brumitt, B., Shafer, S. (Eds.): Proceedings of Ubicomp 2001.

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Castro, P., Chiu, P., Kremenek, T., and Muntz, R. A probabilistic room location service for wireless network environments. In Proceedings of the 3rd International Conference on Ubiquitous Computing (Ubicomp 2001.

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. Paul Castro, Patrick Chiu, Ted Kremenek, and Richard Muntz, A Probabilistic Room Location Service for Wireless Networked Environments, Proceedings of Ubicomp 2001.

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P. Castro, P. Chiu, T. Kremenek, and R.R. Muntz, "A probabilistic room location service for wireless networked environments," in ACM UbiComp, Atlanta, GA, 2001.

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P. Castro, P. Chiu, T. Kremenek, and R. Muntz, "A Probabilistic Room Location Service for Wireless Networked Environments," in Proc. Ubiquitous Computing, 2001.

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P. Castro, P. Chiu, E. Kremenek, and R. Muntz. A probabilistic room location service for wireless networked environments. In Ubiquitous Computing, pages 18--34. Springer, 2001.

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Castro, P., Chiu, P., Kremenek, T., and Muntz, R. A probabilistic room location service for wireless network environments. In Proceedings of the 3rd International Conference on Ubiquitous Computing (Ubicomp 2001.

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