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The context-aware computing is a research field that defines systems capable of adapting their behavior according to any relevant information about entities (e.g., people, places and objects) of interest. Ubiquitous systems are closely related to the use of contexts and are frequently shared among multiple users, once they are designed to be embedded into everyday environments such as houses, cars,...
The context-aware computing is a research field that defines systems capable of adapting their behavior according to any relevant information about entities (e.g.,people, places and objects) of interest. The ubiquitous computing is closely related to the use of contexts, since it aims to provide personalized, transparent and on-demand services. Ubiquitous systems are frequently shared among multiple...
Some proposals are found on the literature for decentralizing SIP-based Voice over IP (VoIP) systems, replacing the client-server architecture for a P2P overlay network but none of the proposed solutions deploying a P2P network had studied the impacting of decentralization on call setup delay. We proposed a system using Kademlia instead of a centralized user location approach. Kademlia offers concurrent...
The increasing interest in wireless mesh network technology and its popularity leads to the vision that we are going to have a wireless cover almost ubiquitous in urban areas. Nevertheless, how will be negotiated these networks services? This article propose a solution to the negotiation of network services using autonomous agents based on simple machine learning techniques combined to economic theories...
Brazilian forests and Savannas have a rich biodiversity that still needs to be known, monitored and protected. Distributed sensing tools such as the wireless sensor networks are a natural solution. These networks have evolved quickly in recent years leading to specializations such as wireless visual sensor networks and wireless multi-tier, multimodal sensor networks, sensor networks distributed over...
The unplanned and random deployment of a Wireless Sensor Network (WSN) may impose a high node density on a specific region. This concentration can be exploited by density control mechanisms to increase network lifetime, by deactivating temporarily redundant sensor nodes. Previous approaches for density control in WSN focus in guaranteeing full sensing coverage of monitoring area. This work presents...
There are many approaches that can be applied to the management of wireless sensor networks (WSN) and nowadays the research in this field is only beginning. A management approach determines how the management monitor and control functions are performed by the network and network elements. Since a wireless sensor network presents severe resource constraints, a certain management approach must be chosen...
A fundamental goal of a wireless sensor network (WSN) is to collect and deliver data to external applications. Due to the strong constraints of these networks, routing algorithms usually consider application-specific characteristics and, consequently, there is no self-contained algorithm appropriate for every case. In particular, many WSN applications are event- driven. In such scenarios, the behavior...
Autonomic networks are able to monitor and control themselves without direct human intervention. The smallest unit of an autonomic network is the autonomic element (AE). This work presents the model and evaluation of a specific wireless sensor network (WSNs) AE, called autonomic sensor element (ASE). The ASE has been proposed considering WSNs hardware, software, communication and energy restrictions.
Autonomic computing defines computational systems that are able to manage themselves with none or minimal human intervention. The concepts related to autonomic computing in computer networks leads to the development of a new concept: autonomic networks. This kind of network is able to perform self-management of its elements and data communication links. Smart environments represent the next evolutionary...
The goal of a wireless sensor network (WSN) management solution is to promote network resources productivity and quality of services. This paper presents a comparative study of client/server (CS) and mobile agent (MA) approaches used in distributed self-management solutions for a hierarchical heterogeneous WSN, in which the managers are embedded into the cluster head nodes. These approaches were simulated...
Wireless sensor networks (WSNs) are characterized by having scarce resources. The usual way of designing network functions is to consider them isolatedly, a strategy which may not guarantee the correct and efficient operation of WSNs. For this reason, in this paper we propose an integrated design of network functions. We take two important WSN functions - density control and routing - as an example...
In this paper we propose a new reconfigurable architecture for sensor nodes, called RANS-300, which can operate in applications demanding low power to high performance, although sacrificing the lifetime of the sensor node. This node has a FPGA board, which can be dynamically reconfigured to add new configuration, and has a Compact Flash device to expand the node possibilities
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