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March 2013

Volume: 13, Issue: 1, March' 2013

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Energy-Efficiency and Reliable Protocol based on Virtual Zones Infrastructure for Wireless Sensor Networks (ERVM)

Authors: Amina MERBAH, Ahmed KAMIL, Hicham BELHADAOUI, Mohamed OUZZIF

Abstract:

The field of wireless sensor networks has covered up a large part in the various aspects of scientific research, thanks to its applications that operate in most active domains, such as military purposes, medical and industrial goals. Large scale sensor networks generally consist of hundreds or even thousands of sensor nodes. Establishing a routing process to produce global coverage of a monitored area is the biggest challenge, since the implementation of energy efficiency of wireless communications in each sensor node is critical. Each routing protocol designed for WSN should be reliable, efficient and ensures the increase of the life time of the network. In this paper we present a new routing protocol that supports reliability and energy efficiency ERVM, we evaluate  this protocol with a set of existing routing protocols (ZHLS and RZRP ). ERVM considers the residual battery capacity of each sensor node to establish  routing paths and to offer the optimal path between several sensor nodes in some specific cases. The evaluation results show the effectiveness of the VZP protocol in terms of end to end delay, and in terms of the number of delivered packets and energy-efficiency.

(pp. 697-706)                    Download PDF        DOAJ

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Effect of Noise Covariance Matrices in Kalman Filter Performance of Power System Harmonics Detection

Authors: Hisham Alrawashdeh, Johnson Asumadu, Jumana Alshawawreh

Abstract:

The prior knowledge of the covariance noise matrices is effecting the performance of the Kalman filter for detecting power system harmonics, In this paper the effect of the noise matrices will be investigated under several circumstances, to determine the quality and the convergence of the Kalman filter in power system harmonics detection.

(pp. 707-717)                    Download PDF       DOAJ

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An Efficient Algorithm using a Meshfree Method for Nonlinear Electromagnetic Field Computation

Authors: Chelghoum Leila, Louai Fatima Zohra, Nait-Said Nasreddine

Abstract:

This paper outlines a numerical procedure based on the magnetic field computation taking the hysteresis into account. The scalar Preisach model is integrated into a meshfree element-free Galerkin (EFG) method analysis. The hysteretic nonlinearity is handled by the fixed point iterative technique.  The developed algorithm was applied to study an electromagnetic device containing a ferromagnetic core. Numerical simulations highlight, among other, the power of the EFG method in terms of time computation and accuracy. Results were compared to those provided by finite element (FE) method.

(pp. 718-721)                    Download PDF       DOAJ

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Portable Instrumentation Smart Sensor Labs

Authors: Aditi Thatte, Bhagavat Patil, Ambarish Thakur, Chaitanya Kulkarni

Abstract:

Data acquisition systems have been used in various applications in our world. Sensors and transducers are the heart of these systems. If any fault occurs in the system then engineer debugs the entire circuit and at the end he comes to know that problem was with the sensor so there is no use of complex DAQ systems if the signals generated from these sensors are faulty. So our project is basically to test the heart of DAQ, the sensors. The project mainly focuses on the testing and characterization of the sensors & transducers. Engineers need to determine system behavior to optimize the performance. Correct signals from sensors indicate performance of the system. This information can be used for modification of performance. Any variation in this information from the sensor, it affects the performance of the system. In general, for testing DMMs are used and oscilloscopes are used to see the characteristic curves. But the project combines the advantages of both the systems and provides better understanding to users. We are implementing the In-built testing of specific sensors and provide the output in very user friendly manner. This enables even non technical user to successfully test the sensor and helps in understanding the behavior of it. So, no need to carry DMMs and big oscilloscopes to do the critical testing. Just take the sensor and plug it into our system. Direct results will be obtained whether the sensor is working or not in real time.

(pp. 722-725)                    Download PDF       DOAJ
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