N. Davies, G. S. Blair, K. Cheverst and A. Friday, "Experiences of Using RM-ODP to Build Advanced Mobile Applications", Distributed Systems Engineering Journal, Volume 2, Number 3, 1995, pp 142-151.  Home/Search   Document Not in Database   Summary   Related Articles   Check

....of the state of the art in middleware support platforms for mobile environments since this particular topic is central to the work described in this thesis. Six major initiatives have so far been concerned with the development of mobile middleware: Adapt [Blair,97a] Mobile DCE [Schill,95] MOST [Davies,95b] Odyssey [Noble,97] RAPP [Seitz,98] and the Rover Toolkit [Joseph,95] Four of these projects have focused on existing distributed systems standards, while the other two have taken a non standards based approach. Section 2.3 presents an overview of the CORBA standard and describes the Adapt ....

....and, secondly, the potential establishment of multiple dial up connections to traverse a hierarchy of traders seeking service offers is clearly undesirable. To address these problems, the MOST platform incorporates a different trading mechanism which features the peer to peer linking of traders [Davies,95b] These links have constraints imposed on them, ensuring they are only traversed when there is a high probability the remote trader will be able to satisfy the request. The MOST platform and application prototype have been implemented on Sun workstations, desktop PCs and laptop PCs running a ....

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N. Davies, G. S. Blair, K. Cheverst and A. Friday, "Experiences of Using RM-ODP to Build Advanced Mobile Applications", Distributed Systems Engineering Journal, Volume 2, Number 3, 1995, pp 142-151.

....after the server has moved. Also, a mobile client will wake up in a different trading environment after it changes its physical location. The imported service offer may be unreachable in the new environment. 2.2. Design issues of a real time trader for mobile clients and servers Davies et al.[5] built an experimental advanced mobile application, Geographical Information Systems for mobile users, on the RM ODP platform. Although the open distributed system architecture does not impose any constraints on the pattern of interconnection, most conventional distributed systems such as RM ODP ....

N. Davies, G. S. Blair et al., "Experiences of using RM-ODP to build advanced mobile applications," Distributed Systems Engineering, vol.2, no.3, pp.142-151, Sept. 1995

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Davies, N., G.S. Blair, K. Cheverst and A. Friday. "Experiences of Using RMODP to Build Advanced Mobile Applications.", Distributed Systems Engineering, Vol. 2, No. 3, pages 142-151, 1995.

....channel by, for example, varying the type and amount of information returned in response to database queries or by providing collaborating users with feedback so that they can match their mode of working to the level of support available. Further details on these adaptive services can be found in [Davies95b]. ....

Davies, N., G.S. Blair, K. Cheverst, and A. Friday. "Experiences of Using RM-ODP to Build Advanced Mobile Applications.", Distributed Systems Engineering Journal, Vol. 2 No. 3, 1995, Pages 142-151. -11-

....the user whose display we can see) reflected by the photograph icons in the centre. Underneath each user is a column of smaller icons representing the components currently being used by that user. A more complete description of the application and the workings of the interface can be found in [Davies,95a] The icons under the representation of each user serve two main purposes. Firstly, the icons graphically illustrate the activities being undertaken by each user and may be clicked on with the mouse to toggle whether group operations are propagated to each of the other users. The figure ....

Davies, N., G.S. Blair, K. Cheverst, and A. Friday. "Experiences of Using RM-ODP to Build Advanced Mobile Applications." 2 No. 3, Pages 142-151.

....at Lancaster this support is provided in the form of explicit bindings between client and server objects. The QoS associated with these bindings can be established at bind time and the platform notifies interested parties if this QoS is violated (more details of this work can be found in [Davies95], Friday96] The disadvantage with the approach described above is that it addresses the issue of change only in network QoS and does not, for example, provide a mechanism for applications finding out about their current location. However, the work has highlighted one important issue regarding ....

Davies, N., G.S. Blair, K. Cheverst, and A. Friday. "Experiences of Using RMODP to Build Advanced Mobile Applications." 2 No. 3, Pages 142-151.

....the inclusion of an electronic mail based application designed for issuing job instructions which enabled annotated diagrams to be sent in addition to plain text. The application was supported by APM s ANSAware software suite [5] which was extended to support operation in a mobile environment [6]. Central to the design of the MOST collaborative application was the end user requirement that field engineers would usually be contactable only via an analogue PMR (Private Mobile Radio) channel. Such a channel offers low bandwidth (approximately 2.4 kbits sec) high latency and, most ....

Davies, N., G.S. Blair, K. Cheverst, and A. Friday, "Experiences of Using RM-ODP to Build Advanced Mobile Applications", Distributed Systems Engineering Journal, Vol. 2 No. 3, Pages 142-151, 1995.

.... which alter the networks perceived QoS [9,10] Given the implications for applications and end users of the characteristics and potential services offered by such a range of networking technologies, there is an increasing requirement for QoS information and control throughout end system software [8,11,12]. This requirement for information provision is in contrast to current distributed systems platforms which justify their existence primarily through the provision of distribution transparencies. For instance, the provision of location and access transparencies greatly simplify the development of ....

....as stated in the previous section, change is a fundamental characteristic of mobile environments. Employing the same approach in environments such as these, i.e. hiding the environmental changes with layers of transparency, prohibits adaptation, the requirement for which has been presented in [8,11,12]. Existing research has postulated that API level QoS abstractions based on communications bindings [13,14] are sufficient to enable platforms and applications to be made aware of, and control, their supporting environment. Indeed, systems based on the concept of bindings have shown that such ....

N. Davies, G. S. Blair, K. Cheverst and A. Friday, Experiences of Using RM-ODP to Build Advanced Mobile Applications, Distributed Systems Engineering Journal 2(3) (1995) 142-151.

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Davies, N., Blair, G.S., Cheverst, K. and Friday, A. (1995) Experiences of Using RMODP to Build Advanced Mobile Applications. Distributed Systems Engineering Journal, 2(3), 142-151.

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