N. Davies et al., "Caches in the Air: Disseminating Information in the Guide System, " Proc. 2nd IEEE Workshop Mobile Computing Systems and Applications (WMCSA 99), IEEE Press, Piscataway, N.J., 1999, pp. 11--19.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....is available, it is delayed until a high bandwidth network connection is available. The problem with this approach is that the users might then not be interested in the requested information anymore, as, in the meantime, they havemoved on to another location. 25 Other approaches, like [2] [7], or [11] are based on broadcast dissemination of information. Their primary focus is to reduce the response time and to increase the scalability of the system. If they are location aware, they are designed to support the users with the information items they need at their current location, e.g. ....

N. Davies, K. Cheverst,K.Mitchell, and A. Friday. Caches in the air: Disseminating information in the guide system. In ########### ## ### ### #### ######## ## ###### ######### ####### ### ############ ###### ####, pages 11-19, New Orleans, USA, February 1999.

....such devices will create new forms of play and entertainment; promote learning, participation and creativity; and support activities both inside and outside of the workplace, including maintaining family and social relationships. Previous work in this field has used tablet and palmtop computers [4, 5], and map based applications for laptops and palmtops are becoming available commercially [6] Figure 1. The eSleeve. We describe research using a smaller, and wearable platform, the Matsucom onHandPC. This research has contributed significantly to the design of our current wearable ....

N. Davies, K. Cheverst, K. Mitchell, and A Friday. Caches in the air: Disseminating information in the guide system. In Proceedings of the 2nd IEEE Workshop on Mobile Computing Systems and Applications, February 1999.

....the abstraction that is required in the first place to make systems accessible in changing environments and situations. The actual utility of context awareness in mobile systems has been demonstrated in a wide range of application examples, in obvious domains such as fieldwork [17,19] and tourism [3,6,18], as well as in emerging areas like affective computing based on bio sensing [15,20] Also, it has been shown, that context is useful at different levels within a mobile device. At systems level, it can be exploited for example for context sensitive resource and power management. At application ....

....of the cell based communication infrastructure in which the base stations double as device locators. Many other context aware mobile systems have likewise used cell of origin as context for location based services, for example the GUIDE system deployed in Lancaster on the basis of a wireless LAN [6]. More recent work has increasingly considered embedding of direct awareness in mobile devices. This has been boosted by rapid advances in sensor technologies, such as piezo materials, VLSI video, optical gyros and MEMS (Micro Electro Mechanical Systems) 22] The trend is leading to sensors in ....

N. Davies, K. Cheverst, K. Mitchell, and A. Friday, Caches in the Air: Disseminating Information in the Guide System. Proc. of the 2 nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), New Orleans, Louisiana, USA, February 1999.

....tags and beacons to enhance physical things by associating their presence with virtual actions, such as the invocation of a program. Work at Georgia Tech [34] has expounded a view of context enabled applications and an infrastructure to support them. The GUIDE project at Lancaster University [9] has developed a system for presenting guide information to tourists as they visit sites. The Satchel project at Xerox s European Research Centre [14] has produced tools to support the mobile worker with services to fetch remote documents and print them locally. A group at Stanford University [21] ....

Davies, N., Cheverst, K., Mitchell, K., and Friday, A. Caches in the Air: Disseminating Information in the Guide System. Proceedings of the 2nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), New Orleans, Louisiana, U.S., 25-26 February 1999.

....of services to points in geographic areas at the instigation of the user or as automatically instigated from the user s device. For example, the SpaceTags system [52] maps the user s GPS coordinates to virtual services from their handheld device; and the GUIDE project at Lancaster University [12] has developed a system for presenting guide information to tourists as they visit sites. 3.4 Infrastructure for People: WebLink WebLink uses a person s point of web presence as a level of indirection for electronic communications. A user such as Harry, with whom Veronica needs to communicate, ....

Davies, N., Cheverst, K., Mitchell, K., and Friday, A. Caches in the Air: Disseminating Information in the Guide System. Proceedings of the 2nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA `99), New Orleans, Louisiana, U.S., 25-26 February 1999.

....Place contexts In general, place contexts can be defined not only in terms of the physical domain but also in terms of other factors, such as the time of day, the identity of the user, the user s device, and the user s current activity. Some of these factors have been explored in tourist guides [9] and other applications such as overviews of working groups and meetings [26] Section 4, for the sake of simplicity, shows only how places are defined irrespective of factors such as time of day. In fact, the data supplied by the Place Manager can be made a function of those factors [6] Both ....

Davies, N., Cheverst, K., Mitchell, K., and Friday, A. Caches in the air: disseminating information in the Guide system. Proc. Second IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), New Orleans, Louisiana, U.S., 25-26 February 1999.

....only a low bandwidth is available, it is delayed until a high bandwidth network connection is available. The problem with this approach is that the users might then not be interested in the requested information anymore, as in the meantime they moved on to another location. Other approaches, like [4] or [9] are based on broadcast dissemination of information. Their primary focus is to reduce the response time and to increase the scalability of the system. If they are location aware, they are designed to support the users with the information items they need at their current location, e.g. ....

N. Davies, K. Cheverst, K. Mitchell, and A. Friday. Caches in the air: Disseminating information in the guide system. In Proceedings of the 2nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), New Orleans, USA, February 1999.

....levels of service. While early research focused on applications which adapted to changes in network characteristics, there is now increasing interest in applications that adapt to general environmental and contextual triggers such as changes in a system s physical location, e.g. the GUIDE system [5] which supplies users with information tailored to their current location. Current adaptive mobile applications are built using one of two approaches: either the adaptation is performed by the system which underpins the application (in an attempt to make transparent the effects of mobility) or, ....

....flows B and C. The application is thus able to alter the functionality of the platform according to its needs via the middleware s meta level interface. Application adaptation can be performed with the use of notifications from the underlying infrastructure. Context aware applications like GUIDE [5], Stick e Notes [19] and Cyberguide [15] are based only on flow C. The underlying platform or device provides the contextual information to the application and the application is responsible for adapting to the change of the context. According to our knowledge the only middleware platform that ....

Davies N., K. Cheverst, K. Mitchell and A. Friday. "Caches in the Air: Disseminating Information in the Guide System". Proceedings of the 2nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), 1999.

.... to the user [11] While early research focused on applications which adapted to changes in network characteristics, there is now increasing interest in applications that adapt to general environmental and contextual triggers such as changes in a system s physical location, e.g. the GUIDE system [2,3] which supplies users with information tailored to their current location. Current adaptive mobile applications are built using one of two approaches: either the adaptation is performed by the system which underpins the application (in an attempt to make transparent the effects of mobility) or, ....

....or disk usage. Consideration of this framework enables a classification of current systems according to the types of flows supported. For example, network based adaptive systems such as BAYOU [18] Odyssey [16] MOST [8] and Rover [10] support flows A and C. Context aware applications like GUIDE [2,3], Stick e Notes [17] and Cyberguide [14] are based on flows B and C. In more detail, for these applications, flow B represents the access to the various context sensors while flow C represents the information flowing from the sensors to the application. According to our knowledge no platform ....

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Davies N., K. Cheverst, K. Mitchell, A. Friday.: Caches in the Air: Disseminating Information in the Guide System. In: Proc. of the 2 IEEE Workshop on Mobile Computing Systems and Applications (WMCSA `99) (1999)

....state (such as a visitor s preferences) and of performing specific actions or satisfying certain requests. Although each particular information type has been successfully modelled, no models could be found that were capable of handling the full complement of information types described above [5]. In more detail, data models for supporting contextsensitive information such as stick e notes [2] are not well suited for managing geographic information such as proximity relationships. Similarly, the data models supported by the current range of object oriented Geographic Information Systems ....

....potential storage requirements associated with storing the model in its entirety, simply caching the model at the local client is not an appropriate solution. In the GUIDE system, the communications infrastructure is used to disseminate the latest version of the information model to GUIDE units [5]. This is achieved using a broadcast based approach [8] In more detail, units listen on a well known multicast IP address for those parts of the information model currently being transmitted in the broadcast cycle. In this way, units entering a cell receive (and locally cache) pages related to ....

Davies, N., K. Cheverst, K. Mitchell, and A. Friday, "Caches in the Air: Disseminating Information in the Guide System, Proc". In Proc. of the 2nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), New Orleans, U.S., IEEE Press, 11-19 (1999).

....informed of such changes and should also be able to adapt their behaviour accordingly in order to deliver the best level of service to the end user. Moreover, future mobile systems should be capable of adapting to general environmental and contextual triggers such as the system s physical location [2]. As presented in [3] current middleware support lacks the required level of control for co ordinating highly adaptive systems triggered by multiple contextual attributes. Reflection has been suggested as a solution for adaptive middleware [1] The benefits of being able to open the ....

Davies N., Cheverst, K., Mitchell, K. and Friday, A. "Caches in the Air: Disseminating Information in the Guide System". Proceedings of the 2nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), 1999.

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N. Davies et al., "Caches in the Air: Disseminating Information in the Guide System, " Proc. 2nd IEEE Workshop Mobile Computing Systems and Applications (WMCSA 99), IEEE Press, Piscataway, N.J., 1999, pp. 11--19.

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Davies, N., Cheverst, K., Mitchell, K., und Friday, A.: Caches in the Air: Disseminating Information in the Guide System. In: 2nd IEEE Workshop on Mobile Comp. Systems and App. New Orleans. 1999.

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N. Davies et al., "Caches in the Air: Disseminating Information in the Guide System, " Proc. 2nd IEEE Workshop Mobile Computing Systems and Applications (WMCSA 99), IEEE Press, Piscataway, N.J., 1999, pp. 11--19.

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N. Davies, K. Cheverst, K. Mitchell, and A. Friday. Caches in the air: Disseminating information in the guide system. In Proceedings of the Second IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), pages 11--19, New Orleans, LA, USA, February 1999.

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Davies, N., Cheverst, K., Mitchell, K., and Friday, A. Caches in the Air: Disseminating Information in the Guide System. Proceedings of the 2nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), New Orleans, Louisiana, U.S., 25-26 February 1999.

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N. Davies et al., "Caches in the Air: Disseminating Information in the Guide System," Proc. 2nd IEEE Workshop Mobile Computing Systems and Applications (WMCSA 99), IEEE Press, Piscataway, N.J., 1999, pp. 11-19.

No context found.

Nigel Davies, Keith Cheverst, Keith Mitchell, and Adrian Friday. `Caches in the Air': Disseminating Information in the Guide System. In Proceedings of the Second IEEE Workshop on Mobile Computing Systems and Applications, pages 11--19, New Orleans, Louisiana, United States, February 25--26, 1999.

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