Mike Spreitzer and Marvin Theimer. Providing location information in a ubiquitous computing environment. In SOSP 1993, pages 270--283, Asheville, NC. ACM Press.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....areas can be integrated into a augmented world model that provides uniform access to the different areas. The data of these areas are stored in different nodes of the platform that maintain databases for the different objects of the areas. Spreitzer and Theimer from Xerox PARC designed a system [13] that sup ports location based information about the entities in the system, but takes into account some privacy issues. The mobile entities are registered at a central server. The entities may choose to hide their personal information and to register with their location and a network address ....

Mike Spreitzer and Marvin Theimer. Providing location information in a ubiquitous computing environment. In Proceedings of the fourteenth A CM symposium on Operating systems principles, pages 270-283. ACM Press, 1993.

....encourage re use. 5. Related work Many have studied context aware applications and their support systems. In Xerox Parc s distributed architecture each user s agent collects context (loca tion) about that user, and decides to whom the context can be delivered based on that user s policy [29, 32]. AT T Laboratories at Cambridge built a dense net work of location sensors to maintain a world model shared between users and applications [16] Location context can be used to select on the spot information for tourist guide applications [1, 11] HP s Cooltown project adds Web context to the ....

M. Spreitzer and M. Theimer. Providing location information in a ubiquitous computing environment. In SOSP 1993, pages 27(3283, Asheville, NC.

....such as the marks written on a shared whiteboard or the calendar of meetings for product teams. A context information infrastructure must, therefore, control access to the information it disseminates. Although researchers often note the importance of privacy and security in context aware computing [7,13,14,10], there is surprisingly little literature about access control in context information systems. In this paper we propose an access control mechanism for protecting context information in an infrastructure for collecting, processing, and disseminating context information. The mechanism must support ....

....to monitor all the roles directly. To avoid the overhead of monitoring role membership, we expect that many implementations will narrow the test to p OPij. 6 Related work There is little published about access control in event distribution systems for pervasive computing. Spreitzer and Theimer [14] discuss privacy issues involved in locationaware applications, and developed a mechanism to encode a user s privacy policy in the user agent that collected and disseminated the user s personal context information. Their approach is limited to location context and does not generalize to derived ....

Mike Spreitzer and Marvin Theimer. Providing location information in a ubiquitous computing environment. In Proceedings of the 18th ACM Symposium on Operating $,stems Principles(SOSP'93), pages 270-283, Ashville, NC, 1993. ACM Press. 14

....http: www.versustech.com 6 Related work Many have studied context aware applications and their support systems. In Xerox Parc s distributed architecture each user s agent collects context (location) about that user, and decides to whom the context can be delivered based on that user s policy [31, 34]. AT T Laboratories at Cambridge built a dense network of location sensors to maintain a world model shared between users and applications [17] Location context can be used to select onthe spot information for tourist guide applications [1, 11] HP s Cooltown project adds Web context to the ....

M. Spreitzer and M. Theimer. Providing location information in a ubiquitous computing environment. In Proceedings of the 14th ACM Symposium on Operating Systems Principles, pages 270--283, December 1993.

....applications such as visualisation, routing of phone calls to users, and teleporting of roaming computer sessions [64] Lpez de Ipia [36] describes a vision based passive tag location system, TRIP, and a sentient computing architecture with similar applications to SPIRIT. Spreitzer et al. [65] describe an infra red sensor system in which tags are placed in the environment and are monitored by mobile agents themselves. The Eucalyptus architecture can provide similar location like context metrics to the tag systems described above. Whereas the SPIRIT system relies inherently on ....

Mike Spreitzer and Marvin Theimer. Providing Location Information in a Ubiquitous Computing Environment. In SIGOPS, pages 270--283. ACM, 1993.

....subscribing Planet. 6 Related work Many have studied context aware applications and their supporting systems. In Xerox Parc s distributed architecture each user s agent collects context (location) about that user, and decides to whom the context can be delivered based on that user s policy [21,23]. AT T Laboratories at Cambridge built a dense network of location sensors to maintain a world model shared between users and applications [13] Location context can be used to select on the spot information for tourist guide applications [1,6] HP s Cooltown project adds Web context to the ....

Mike Spreitzer and Marvin Theimer. Providing location information in a ubiquitous computing environment. In SOSP 1993, pages 270 283, Asheville, NC. ACM Press.

....systems As in smart spaces, context aware applications adapt their behaviors to their context, as obtained from per12 vasive information sources. In many systems, a monolithic module transforms the raw sensor information into high level context, which is then available to applications [34, 36]. They provide no support for applications to derive new refined information, in ways that were not expected by the information providers. The Context Toolkit [13] is a distributed system that encapsulates each sensor as a widget with a service component. Applications may subscribe to sensor data ....

Mike Spreitzer and Marvin Theimer. Providing location information in a ubiquitous computing environment. In Proceedings of the 14th ACM Symposium on Operating Systems Principles, pages 270--283, Asheville, NC, December 1993. ACM Press.

....abstraction. 5 Related work Many have studied context aware applications and their supporting systems. In Xerox Parc s distributed architecture each user s agent collects context (location) about that user, and decides to whom the context can be deliv ered based on that user s policy [16, 17]. A few projects specifically address the flexibility and scalability of context aggregation and dissemination. Like Solar, the Context Toolkit is a distributed architecture supporting context fusion and delivery [5] It uses a widget 1 See http: www. cs.dartmouth.edu solar for more ....

Mike Spreitzer and Marvin Theimer. Providing location information in a ubiquitous computing environment. In SOSP 1993, pages 270-283, Asheville, NC. ACM Press.

....the potentially huge number of pairs for which a policy needs to be established. Protecting People Location Information (Extended Abstract) 3 What approach is most appropriate depends on the environment in which people are being located. For example, earlier work (e.g. by Spreitzer and Theimer [4]) lets users have influence on room policies. One example is that users can specify whether room queries for a room will include them in their answer, effectively giving user policies precedence over room policies. While this approach is appropriate for some scenarios (e.g. public buildings) it ....

M. Spreitzer and M. Theimer. Providing Location Information in a Ubiquitous Computing Environment. In Proceedings of SIGOPS '93, pages 270--283, Dec 1993.

....of a hierarchy of m regional matching directories . In their scheme, forwarding pointers 21 and regional matching directories are used to enable localized updates and searches. Spreitzer et al. proposed a network architecture which consists of user agents and a location query service (LQS) [10]. There is a dedicated user agent per user and these user agents are responsible to forward any communication to or from the user. This scheme was mainly aimed for local networks the kind used within building premises. As the number of hosts in a network increase, it might not be efficient to ....

M. Spreitzer and M. Theimer, "Providing Location Information in a Ubiquitous Computing Environment, " Tech. Rept., Xerox PARC, 1993.

....of communicating appliances [19] Our approach to nomadic users extends work on mobile web browsers ( wireless web ) to support the augmentation of physical entities in the environment with web resources. In this way we see our work as combining the physical information systems work of Xerox PARC [27, 29] with the Web. Our work describes an approach to system development based on assumptions about the hardware and communications resources available. To start then we need to layout those assumptions. Nomadicity. Our first assumption is that users will be mobile: they will use computing resources ....

....environments potentially process detailed location information, and they provide points of exposure with which users are not currently familiar, such as utilization of a wireless networking infrastructure. We shall deal briefly with the question of location information. In active badge systems [27, 30], locations sense users via the badges they wear, which emit a unique identifier. The system thus knows where each user is, without the user having to take any action. This is the inverse of the CoolTown approach, in which users decide whether to sense their location, and can do so without ....

Spreitzer, M., and Theimer, M. Providing location information in a ubiquitous computing environment. Proc. Fourteenth ACM Symposium on Operation System Principles, 1993, pp. 270-283.

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Mike Spreitzer and Marvin Theimer. Providing location information in a ubiquitous computing environment. In SOSP 1993, pages 270--283, Asheville, NC. ACM Press.

No context found.

Spreitzer, M., Theimer, M.: Providing Location Information in a Ubiquitous Computing Environment. In: Proceedings of SIGOPS '93. (1993) 270--283

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Spreitzer, M. and M. Theimer. Providing location information in a ubiquitous computing environment. In Fourteenth ACM Symposium on Operating System Principles. Asheville, NC: ACM Press. pp. 270-283. 1993.

No context found.

M. Spreitzer and M. Theimer. Providing Location Information in a Ubiquitous Computing Environment. In Proceedings of SIGOPS '93, pages 270--283, Dec 1993.

No context found.

Spreitzer, M. and M. Theimer. Providing location information in a ubiquitous computing environment. In Proceedings of Fourteenth ACM Symposium on Operating System Principles. Asheville, NC: ACM Press, December 1993.

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M. Spreitzer and M. Theimer, "Providing Location Information in a Ubiquitous Computing Environment," Proc. 14th ACM Symp. Op. Sys. Principles, Dec. 1993.

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Spreitzer, M. and M. Theimer, "Providing Location Information in a Ubiquitous Computing Environment", Proc. 14th Symposium on Operating System Principles, ACM Press, December 1993, pages 270-283.

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Mike Spreitzer and Marvin Theimer. 1993. "Providing Location Information in a Ubiquitous Computing Environment". In Proceedings of the 14th ACM Symposium on Operating Systems Principles (SIGOPS '93). 270-283.

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Mike Spreitzer and Marvin Theimer. Providing location information in a ubiquitous computing environment (panel session). In Proceedings of the fourteenth ACM symposium on Operating systems principles, pages 270-- 283. ACM Press, 1993.

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M. Spreitzer and M. Theimer . Providing location information in a ubiquitous computing environment. In Proceedings of the 14th International Conference on Distributed Computing Systems, pages 29-38, Poznan, Poland, June 1994.

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M. Spreitzer and M. Theimer. Providing location information in a ubiquitous computing environment. In 14th ACM Symposium on Operating System Principles, volume 27, pages 270-283, Dec. 1993.

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M. Spreitzer and M. Theimer. Providing Location Information in a Ubiquitous Computing Environment. In Proc. 14th ACM SIGOPS Conf., pages 270--283, Asheville, NC, December 1993.

No context found.

M. Spreitzer and M. Theimer, "Providing Location Information in a Ubiquitous Computing Environment," Proc. 14th ACM Symp. Op. Sys. Principles, Dec. 1993.

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Spreitzer, M., Theimer, M. Providing location information in an ubiquitous computing environment. In Proceedings of the Fourteenth ACM Symposium on Operating System Principles, Dec. 1993.

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