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Internet service providers are increasingly facing the growing demand for higher bandwidth to satisfy users demand. In the condition of overloaded, the web servers show delays in offering services until reaching total unavailability. There exist several approaches to deal with this problem, the core of them use the configuration of a web server in cluster, but offering the service as a single entity...
Wireless Sensor Networks are used widely for remote environmental monitoring, target tracking or for recording weather conditions change applied at diverse applications. They have become integral part of our lives, by giving reliable data gathering and even that the sensor node is small, lightweight and portable. As the power for each sensor node is supplied from a battery, the lifetime and residual...
The study of Wireless Sensor Network is focused mainly on increasing the values of two main parameters like network lifetime and information reliability. All the algorithms and routing techniques applied on such networks try on their best effort to improve the performance and to have as result the most convenient values of both parameters. Lifetime and reliability are crucial in all kind of WSN application...
The goal of this chapter is to evaluate the efficiency of three versions of the well known gossip algorithm, namely: basic gossip, push-sum and broadcast, for the distributed solution of averaging problems. The main focus is on the impact of link failures that, reducing the network connectivity, decrease the convergence speed. As a similar effect occurs in non-fully-meshed networks, because of a limited...
Localization of sensor nodes in WSN in many different scenarios is becoming an important issue due to their widespread application. Different system parameters are changed in order to have a better performance. In this study are taken in consideration the simulation of the approaches of Hybrid algorithm but now with two more improvements brought to it. Based on simulations we understood the influence...
Recent researches on the usage of technology in different area of life activities have made WSN widely useful in monitoring different environments. Different monitoring tasks are being used in WSN and for that; in order to acquire the best performance is needed to focus in an essential parameter that is the node localization. This paper studies the localization issue based on three existing algorithms,...
Radio Frequency IDentification (RFID) is an identification technique for storing and transferring data and it is applied for identifying and tracking tags. Our study focus on RFID tags localization by using only mobile readers without the inclusion of static readers, helps to avoid pre-deploying of static readers. We are based only on connectivity information for achieving the goal of robust 3D localization...
The optimization of wireless sensor networks in terms of lifetime and quantity of information has been investigated recently through a large number of algorithms and routing techniques. The main contribution of the paper consists in studying the application parameters that can change the behavior of existing algorithms, as the network information collecting ability. Simulations show that due to this...
In the most common standard coding of the image, coder has greater complexity than the decoder, usually 5-10 times higher. In wireless sensor networks is the opposite, the coder implemented in a battery feed device has very limited resources, while decoder is typically implemented in a powerful computer. The paper focuses on a combination of wavelet technique with algebraic GPCA method, realizing...
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