S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. IEEE Transactions on Knowledge and Data Engineering, 12(5):802-820, 2000.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....Retrieval Service (SRS) The service proposed in this paper takes part of a more global system called ANTARCTICA [3] which main goal is to offer different wireless data services that enhance the capabilities of mobile devices . The implementation of the SRS is based on the agent technology [4, 10]. So, four main agents participate in the service: Alfred (the user agent situated at the user device) who is an efficient majordomo that serves the user and is on charge of storing as much information about the user device and the user her himself as possible; The Software Manager agent (situated ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. In Proceedings of the International Conference on Data Engineering, 1999.

....transactions to a set of mobile agents. The authors of [9] proposed that parallel processing was one of the application areas of mobile agent approach. Their paper described JAMES, a Java based platform that provides support for parallel computing. The group of G. Samaras pointed out in [10] that the current commercial applet based methodologies for accessing database systems offered limited flexibility, scalability and robustness in comparison with the Javabased mobile agent systems. Their work showed the performance of the mobile agent system was comparable to, and in some case ....

Papastavrou S., Samaras G. and Pitoura E. "Mobile Agents for WWW Distributed Database Access", Proceedings of 15 International Conference on Data Engineering (ICDE'99), Sydney, Australia, March 23-26, 1999, pp. 228 --237.

....But they simply put mobile agents in a serial working pattern and their global control mechanisms are not clear. The work of Silva, Papastavrou, Panayiotou and Wang all showed the advantages of applying the mobile agent approach to parallel processing over distributed databases or data sources [10,11,14,17]. A mobile agent can decompose its tasks to multiple sub mobile agents and dispatch them to distributed sites simultaneously in order to let them work in parallel. Hence, the mobile agent technology is naturally suitable for deploying parallel and distributed computation. The performance is ....

S. Papastavrou, G. Samaras, and E. Pitoura, "Mobile agents for WWW distributed database access," in Proceedings of 15th International Conference on Data Engineering (ICDE'99), Sydney, Australia, March 23--26, 1999, pp. 228--237.

.... agent paradigm can solve or improve some database and information retrieval problems is investigated in [7] Based upon basic distributed computing models adapted to the mobile agent paradigm, a set of frameworks for distributed database access over the World Wide Web was proposed and tested [8, 6]. Mobile agents were efficiently used for distributed query processing [4] Recently, a basic research into efficient execution strategies for mobile database procedures querying distributed databases was presented in [9] We have applied mobility in the field of multidatabase systems. Laying ....

Papastavrou, S., Samaras, G., Pitoura, E.: Mobile Agents for WWW Distributed Database Access. In: 15th International Conference on Data Engineering (ICDEE99), Sydney, 1999.

....services that the ANTARCTICA system offers we can mention: an efficient access to web pages and to data repositories through SQL, a customized e mail service, data lockers management, etc. Many recent research efforts in the area of mobile computing combine the use of proxies and agent technology [2, 4, 10]. The Agent TCL approach [2] proposes to use a number of hosts, distributed in a fixed network, called docks, whose goal is to allow agents to wait there until their mobile computers reconnect. The goal of the OnTheMove project [4] is to investigate a mobile middleware, which supports applications ....

....[2] proposes to use a number of hosts, distributed in a fixed network, called docks, whose goal is to allow agents to wait there until their mobile computers reconnect. The goal of the OnTheMove project [4] is to investigate a mobile middleware, which supports applications for the mobile users. In [10] a performance analysis shows that the use of mobile agents when accessing data sources from web navigators is more efficient than the use of Java applets, especially when using wireless communications. The main contributions of the ANTARCTICA system are: first, the design of multipurpose proxies ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. In Proceedings of the International Conference on Data Engineering, 1999.

....The main idea behind them is that wireless devices send agents to the xed network, where they work autonomously to carry out their tasks, and once they nish, they return to the wireless devices. Finally, among the works that, as in our case, use agent and proxies we mention [GRK97,KRR98,PSP00] In [GRK97] they describe an agent system called Agent TCL and propose to use certain hosts (called docks) distributed in the xed network where agents that cannot return to the corresponding wireless devices (because they are disconnected) remain temporarily. In [KRR98] the OnTheMove project ....

....temporarily. In [KRR98] the OnTheMove project is presented, the goal of which is to investigate 1 Autonomous ageNT bAsed aRChitecture for cusTomized mobIle Computing Assistance. A preliminary version appears in [VGGI98] a mobile middleware that supports applications for mobile users. In [PSP00] a statistical analysis appears that demonstrates the interest of using mobile agents for web database access. This last group of works is the closest to ours. However two main features di erentiate our proposal (ANTARCTICA) from the others. The rst di erence concerns the services provided by ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. IEEE Transactions on Knowledge and Data Engineering, 12(5):802-820, 2000.

....papers remain qualitative and subjective in their nature. The dearth of quantitative results, however, means it has not yet been possible to fully evaluate the potential of either the technology or the paradigm. In the last year a trickle of results is beginning to validate some of the claims [23] [24] and these results are certainly important in establishing the credibility of mobile code systems. In addition, there has been work done to attempt to fully understand this new paradigm at the abstraction level [19] and develop metrics for system evaluation [22] 3 Issues Facing Mobility ....

Papastavrou, S., Samaras, G., Pitoura, E.: Mobile Agents for WWW Distributed Database Access. Proceedings of IEEE International Conference on Data Engineering (ICDE99), 1999.

....connection either to his desktop computer or to his Personal Digital Assistant in a mobile setting. The Proxy Server of FIGI is implemented as a stationary Concordia Agentwhich launches Mobile Agents to access and combine information sources over the network, implementing the scheme described in [PSP99] Finally, the FIGI servers described in Figure 1 (Login, Alerter, Profile Registry) are implemented as Concordia Service Bridges. CONCLUSIONS The Mobile Agenttechnology is a flexible and efficient platform for implementing environments that will help mobile investors cope with the information ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile Agents for WWW Distributed Database Access. In Proceedings of the Fifteenth International ConferenceonData Engineering. IEEE, March1999.

....connection either to his desktop computer or to his Personal Digital Assistant in a mobile setting. The Proxy Server of FIGI is implemented as a stationary Concordia Agent which launches Mobile Agents to access and combine information sources over the network, implementing the scheme described in [11, 12]. Finally, the FIGI servers described in Figure 1 (Login, Alerter, Profile Registry) are implemented as Concordia Service Bridges. 4 Conclusions The Mobile Agent technology is a flexible and efficient platform for implementing environments that will help mobile investors cope with the ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile Agents for WWW Distributed Database Access. In Proceedings of the Fifteenth International Conference on Data Engineering. IEEE, March 1999.

No context found.

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. In Proceedings of the International Conference on Data Engineering, 1999.

No context found.

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. In Proceedings of the International Conference on Data Engineering, 1999.

No context found.

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile Agents for WWW Distributed Database Access. IEEE Transactions on Knowledge and Data Engineering, 2000.

....applications have gained remarkable pop ularity. One of the most promising approaches for developing such applications is the Java based mobile agent paradigm [13, 28] Mobile agents (MA) are being used already in a variety of Internet based distributed computing applications: Web databases [17], coop erative environments [6] information gathering systems [8] electronic commerce systems [31] and so on. In that context, a distributed application can be considered as a dynamic group of agents working in coordination to accomplish some goal. The employment of MA technologies for the ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile Agents for WWW Distributed Database Access. In Proceedings of the Fifteenth International Conference on Data Engineering, pages 228-237. IEEE, March 1999. 35

....the results. All subsequent queries require only the execution phase. 3. 3 RPC like approach: Java Mobile Agents (JMA) Finally, in this subsection, we describe the approach of using mobile agents to achieve Web database connectivity, and specifically, the best of the three variants proposed in [15]. Mobile agents [3, 7] are processes capable of pausing their execution on one machine, dispatching themselves on another machine and resuming their execution on the new machine. The idea in the JMA approach is to use one or more mobile agents to implement the middleware and carry out the requests ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile Agents for WWW Distributed Database Access. Fourteenth IEEE Int'l Conference on Data Engineering, Feb. 1999.

....on the idea of renting resources, such as for example [3] where the main focus is on accounting CPU cycles and communications consumption made by the hosted processes. On the contrary, the main idea of our service is to rent storage. The second line exploits the use of proxies and software agents [7, 6, 4, 13, 5, 8, 9]. To our knowledge, our work is the first one to combine both aspects, by employing proxies and agents to provide users with storage external to their mobile computers. Finally, our work can benefit from other works, such as the CODA project [7] by implementing the ideas and techniques they ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. In Proceedings of the International Conference on Data Engineering, 1999.

....overcome the lack of multiple inheritance in Java, we had to use both interfaces 4 and classes. To enhance the new Aglets with additional capabilities is now straightforward. For example, to extend the parallel framework with database capabilities we only have to create a database TaskHandler [8], make it a descendant of the TaskHandler class and extend the PaCMAn mobile agent in order to use the DBMS TaskHandler (which could be any of the Developer s TaskHandler in Figure 4) Such a scenario is demonstrated in the section below. 5.2 Implementation Roadmap The PaCMAn framework provides ....

S. Papastavrou, G. Samaras, and E. Pitoura, "Mobile Agents for WWW Distributed Database Access", Proceedings of 15th International Data Engineering Conference, Sydney, Australia, March 1999.

....applications have gained remarkable popularity. One of the most promising approaches for developing such applications is the Java based mobile agent paradigm [19, 24] Mobile agents (MA) are being used already in a variety of Internet based distributed computing applications: Web databases [20], cooperative environments [5] information gathering systems [12] electronic commerce systems 1 [25] and so on. In that context, a distributed application can be considered as a dynamic group of agents working in coordination to accomplish some goal. The employment of MA technologies for the ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile Agents for WWW Distributed Database Access. In Proceedings of the Fifteenth International Conference on Data Engineering, pages 228-237. IEEE, March 1999.

....autonomous and auto managed extension of the MU, dynamically customizable to the user needs and network status, that gives the agents more autonomy to work for long periods of time even when the MU is disconnected. The second line of related research exploits the use of proxies and software agents [6, 4, 5, 3, 7, 9]. To our knowledge, our work is the rst one to combine both aspects, by employing proxies and agents to provide users with storage external to their mobile computers. However, our work can bene t from other works, such as the CODA project [6] by implementing the ideas and techniques they propose ....

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. In Proceedings of the International Conference on Data Engineering, 1999.

....applications have gained remarkable popularity. One of the most promising approaches for developing such applications is the Java based mobile agent paradigm [15, 28, 12] Mobile agents are being used already in a variety of Internet based distributed computing applications: Web databases [19], cooperative environments [2] information gathering systems [5] electronic commerce systems [30] and so on. In that context, a distributed application can be thought of as a dynamic group of agents working in coordination to accomplish some goal. As the mobile agent paradigm becomes prevalent ....

....distributed database access over the World Wide Web and present several computational models that are pertinent to this application. The choice of Web databases is not random: previous research has established the advantages of the mobile agent approach over other state of the art techniques [19]. We propose a number of benchmarks to assess basic performance properties of mobile agent platforms and compare the performance of different mobile agentbased frameworks for distributed database access over the Web. Finally, we describe our experiences with two Mobile Agent platforms that we used ....

[Article contains additional citation context not shown here]

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile Agents for WWW Distributed Database Access. In Proceedings of the Fifteenth International Conference on Data Engineering, pages 228--237. IEEE, March 1999.

.... SSOHW 06#DJOHW # 0HVVHQJHU 6LQJOH 06#DJOHW 06#DJOHW ZLWK 0HVVDJH Figure t2: Long Transactions Graph The Z test proved that the time required for the DBMS aglet with Messages methodology for first queries is always less than the time required for any other approach (see full version [24]) A similar analysis has been made for all methodologies concerning subsequent queries proving that the best methodology for all cases of client connectivity is the traditional Applet . Taking the results from the Z test, we safely produced the time required for short and long transaction for ....

S. Papastavrou, E. Pitoura, G. Samaras. Mobile Agents for WWW Distributed Database Access. (extended version). Technical Report TR 98-12, Univ. Of Cyprus, Computer Science Department, Sept. 98.

No context found.

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. IEEE Transactions on Knowledge and Data Engineering, 12(5):802-820, 2000.

No context found.

S. Papastavrou, G. Samaras, and E. Pitoura. "Mobile agents for WWW distributed database access." Proceedings of the International Conference on Data Engineering, 1999.

No context found.

S. Papastavrou, G. Samaras, and E. Pitoura. Mobile agents for WWW distributed database access. IEEE Transactions on Knowledge and Data Engineering, 12(5):802-820, 2000.

No context found.

Stavros Papastavrou, George Samaras and Evaggelia Pitoura, "Mobile Agents for WWW Distributed Database Access ", Proceedings of IEEE International Conference on Data Engineering (ICDE99), 1999.

No context found.

Papastavrou S., Samaras G. and Pitoura E. "Mobile Agents for WWW Distributed Database Access", Proceedings of 15 International Conference on Data Engineering (ICDE'99), Sydney, Australia, March 23-26, 1999, pp. 228 --237.

Online articles have much greater impact   More about CiteSeer.IST   Add search form to your site   Submit documents   Feedback  

CiteSeer.IST - Copyright Penn State and NEC