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El autor Oscar Urra ha publicado 2 artículo(s):

1 - Simulating Mobile Agents in Vehicular Networks

In the next years, vehicular ad hoc networks (VANETs) are expected to become a reality and a great number of interesting applications for drivers and passengers will be developed (related to safety, comfort, and entertainment). In all these applications, the acquisition, management and an efficient and effective exchange of data will be key issues. Therefore, significant data management challenges arise in this context. We argue that mobile agent technology could play an important role as a middleware for the development of applications for vehicular networks, as they naturally support disconnected operations and distributed data management. Overall, a development of solutions based on agents that autonomously take decisions may be promising. A significant problem arises when we need to evaluate a data management approach for vehicular networks. Deploying it in the real-world in order to evaluate the proposal with real cars is impractical and very expensive, and so field tests are limited to very small-scale and controlled scenarios, mainly as a proof of concept. Instead, simulators are usually used for experimental evaluation. However, existing simulators for vehicular networks do not directly support testing data management techniques based on the use of mobile agents. In this paper, we present a simulator that offers interesting functionalities for that context. The simulator has been developed in a quite generic and extensible way, in order to facilitate its use in a variety of scenarios to test different data management approaches.

Autores: Oscar Urra / Sergio Ilarri / Eduardo López / 
Palabras Clave: mobile ad-hoc networks - mobile agents - mobile computing - simulations - vehicular networks

2 - An approach driven by mobile agents for data management in vehicular networks

In the last years, and thanks to improvements on computing and communications technologies, wireless networks formed by vehicles (called vehicular networks) have emerged as a key topic of interest. In these networks, the vehicles can exchange data by using short-range radio signals in order to get useful information related to traffic conditions, road safety, and other aspects. The availability of different types of sensors can be exploited by the vehicles to measure many parameters from their surroundings. These data can then be shared with other drivers who, on the other side, could also explicitly submit queries to retrieve information available in the network. This can be a challenging task, since the data is scattered among the vehicles belonging to the network and the communication links among them have usually a short life due to their constant movement. In this paper, we use mobile agent technology to help to accomplish these tasks, since mobile agents have a number of features that are very well suited for mobile environments, such as autonomy, mobility, and intelligence. Specifically, we analyze the benefits that mobile agents can bring to vehicular networks and the potential difficulties for their adoption. Moreover, we describe a query processing approach based on the use of mobile agents. We focus on range queries that retrieve interesting information from the vehicles located within a geographic area, and perform an extensive experimental evaluation that shows the feasibility and the interest of the proposal.

Autores: Oscar Urra / Sergio Ilarri / Raquel Trillo-Lado / 
Palabras Clave: data management - mobile agents - query processing - vehicular ad hoc networks