Chen, G., Kotz, D.: Supporting adaptive ubiquitous applications with the SOLAR system. Technical Report TR2001-397, Dartmouth College, Computer Science (2001)  Home/Search   Document Details and Download   Summary   Related Articles   Check

....of the graph abstraction. Section 4 overviews several design issues involved in realizing the graph abstraction, by discussing possible approaches and the specific choices we made in our prototype Solar system ; the details of Solar s architecture and implementation are presented in other papers [7, 8]. We men tion related work in Section 5 and summarize in Sec tion 6. 2. Motivation We arrived at our graph abstraction by considering the structure of applications that consume context infor (a) c) d) e) Figure 1. The evolution of data flow structures. marion, the proper location for ....

....the Solar architecture to support the following discussion of general design issues. The details of the specific Solar implementation, experimental results, security and privacy model, and applications are not the focus of this paper and interested readers are referred to our technical reports [7, 8, 22, 23]. At the center of any Solar system is a Star, which maintains the operator graph and services requests for new subscriptions. When the Star receives a new subscription description from an application, it parses the description, checks the name space, and matches the subscription against its ....

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G. Chen and D. Kotz. Supporting adaptive ubiquitous applications with the SOLAR system. Technical Report TR2001-397, Dartmouth College.

....mechanism is designed for the Solar system, which is under development at Dartmouth College, and for systems like Solar. In this section we summarize the features of Solar needed to understand this paper. For more information on Solan: see the companion paper [4] or our earlier paper [3]. Solar is middleware that supports the collection, processing, and dissemination of context information for context aware applications. in Solar, sensor data and context information are represented as events flowing from sources through operators (which filter, transform, or aggregate events ....

....mergers, A are aggregators, and F are filters. ID Location Active Change Map Merger Aggmgaror Application Location Bob s Guide Architecture. The Sola system is distributed across many hosts, although the only abstraction presented to operators and applications is the operator graph [3,4]. Applications run outside the Solar system, on any platform, using a small Solar library that allows them request subscriptions and to receive events over standard network proto cols. Summary. Although we describe our access control mechanism in terms of the Solar infrastructure, most of its ....

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Guanling Chen and David Kotz. Supporting adaptive ubiquitous applications with the SOLAR system. Technical Report TR2001-397, Dept. of Computer Science, Dartmouth College, May 2001.

....1 across hosts in the network and by sharing identical data streams across users and applications. This paper provides a brief overview of the Solar infrastructure. We necessarily skip many of the details here because of the space limitation. For more information see our Technical Report [3]. 2 Operator graph Solar treats sensors of ubiquitous data as information sources, whether they sense physical properties such as location, or computational properties such as network bandwidth. Information sources produce their data as events, implemented in Solar as objects. The sequence of ....

....space does not scale. Furthermore, given the dynamic nature of an application s context in ubiquitous computing environments, Solar s name bindings change with the changing context. So Solar s name space is organized as a tree of labelled nodes, with the addition of cross edges (see an example in [3]) The name for a node is the sequence of labels encountered on any path from the root to the node, separated by slashes. There are several types of nodes. Some of the leaves are alias nodes that are representatives of another node. By analogy to Unix, we call these cross edges soft links . Some ....

G. Chen and D. Kotz. Supporting adaptive ubiquitous applications with the SOLAR system. Technical Report TR2001-397, Dept. of Computer Science, Dartmouth College, May 2001.

....some of the other design choices in related prototypes. 5 The Solar system We are building a prototype infrastructure for context collection, aggregation, and dissemination, based on the operator graph abstraction. We describe our prototype, the Solar system, in detail in a technical report [8]. In this paper we focus on the graph abstraction and related design choices. Our Solar prototype is implemented in Java. It models events as Java objects and uses Java serialization for event transmission. The operators are small Java objects that implement a simple publish subscribe interface. ....

....in a supporting system, and we discuss design issues involved with event representation, operator naming, event routing, and programming models. We give an overview of our Solar system that implements the graph abstraction. Interested readers can find more details in technical reports about Solar [8] and about a smart reminder application built on top of Solar [26] ....

G. Chen and D. Kotz. Supporting adaptive ubiquitous applications with the SOLAR system. Technical Report TR2001-397, Dept. of Computer Science, Dartmouth College, May 2001.

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Chen, G., Kotz, D.: Supporting adaptive ubiquitous applications with the SOLAR system. Technical Report TR2001-397, Dartmouth College, Computer Science (2001)

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