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| Year : 2011 | Volume
: 57
| Issue : 5 | Page : 397-398 |
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Scanning the Issue
Shiban K Koul
Editor-in-Chief, India
| Date of Web Publication | 24-Nov-2011 |
Correspondence Address:
Shiban K Koul
Editor-in-Chief
India
 DOI: 10.4103/0377-2063.90144
How to cite this article:
Koul SK. Scanning the Issue. IETE J Res 2011;57:397-8 |
The current issue of the IETE Journal of Research, Vol.57, No.5 (September-October, 2011) contains 11 articles. These articles present on-going research and developments taking place in the broad areas of Electronics, Communication, Electromagnetics, Computers and Control systems.
The paper "Hybrid Radio and Optical Communications for Energy-efficient Wireless Sensor Networks" investigates the energy efficiency of hybrid radio frequency (RF) and free-space optical (FSO) wireless sensor networks using simulation models. Although the communication between the base station and nodes using free-space optical links requires line of sight unlike in an RF link, yet a combination of RF and FSO based wireless sensor networks is shown to reduce the average energy consumption at the nodes compared to RF only networks.
The next paper, "A Novel Approach to the Design of MESFET-based MMIC Switches Using Common-gate Parameter Extraction," describes a new optimization technique for the modeling of an HEMT operated in common-gate configuration. Parameters extracted at 1 GHz are validated for the frequency range of 1-20 GHz with excellent accuracy. A simple design method for the SPDT switch is proposed where the size of the HEMT is optimized depending on the isolation and the insertion loss.
In the paper "Algorithm for Web Server Security," an algorithm for web security is described. The method is based on experimental scanning results from several research and educational websites, which also takes into account the number of open ports. Some sample case studies are also presented.
The next paper titled "A Fake Content Remove Scheme using Binomial Distribution Characteristics of Collective Intelligence in Peer-to-Peer Environment" addresses the problem of fake content removal in a peer-to-peer distributed network environment. The proposed scheme uses trust manager model and host information and is based on the collective intelligence of several users' evaluation to take a decision. A decision criterion is presented and studied using computer simulations for trustworthy and unbiased evaluation cases.
The paper "T-connected Transformer with a Voltage Source Converter for Voltage Control of an Isolated Asynchronous Generator" proposes a voltage controller configuration using a voltage source converter with a T-connected transformer for an isolated asynchronous generator driven by constant speed prime movers that feed into three-phase four-wire consumer loads. The controller is studied in computer simulation environment which shows its capability in eliminating harmonics and load balancing in addition to controlling voltage and providing neutral conductor path.
The next paper on "Multiband Rectangular Microstrip Antennas"describes design details of a dual- and triple-band rectangular slot and half U-slot cut antennas. It has been shown that resonance frequencies can be tuned by changing the slot lengths. For better understanding of the multi-frequency operation of the patch antennas, new MN models are proposed. Modified multiband RMSA in suspended configurations are proposed for improving the gain.
In the paper "Fuzzy Tracking Control for Indirect Field-oriented Induction Machine Using Integral Action Performance," the problem of designing a fuzzy controller applied to an induction motor with H∞ tracking is explored. A fuzzy model of the induction motor is used to design the controller. The performance efficiency of the fuzzy controller in terms of tracking performance and load torque rejection capability is studied and presented through computer simulations.
The following paper on "Frequency and Time Domain Characterization of a Novel Hexagonal-shaped Microstrip Antenna for Ultra Wideband Applications"describes frequency and time domain characterization of a novel hexagonal monopole antenna for UWB wireless applications. The proposed structure offers a wider impedance bandwidth, broader radiation patterns, and an improved time domain behavior.
In the next paper titled "Performance Evaluation of Shot Boundary Detection Metrics in the Presence of Object and Camera Motion," an algorithm is given for the detection of shot boundaries for video partitioning for indexing applications. The method is based on dual tree complex wavelet transform that targets the problem of incorrect decisions in the presence of fast camera and object motion. The performance of the algorithm is evaluated in terms of Recall, Precision and F1 measure and compared with other methods for shot detection.
The paper "Neural Network Based Voltage and Frequency Controller for Isolated Wind Power Generation" gives the design of an ANN based voltage and frequency control of an isolated asynchronous generator that feeds to three-phase four-wire loads. The controller with bi-directional power flow capabilities functions as a voltage and frequency controller in wind energy conversion systems, a load leveller, a load balancer and harmonics eliminator. The performance is studied using computer simulations for nonlinear loads and balanced/unbalanced linear loads and variations in wind speed.
In "Practical Blind Approach for Joint Detection and Parameter Assessment in Direct Sequence Code Division Multiple Access Systems," the authors investigate the problem of blind code extraction of DS-CDMA signals using independent component analysis to estimate the number of active users, to distinguish correctly extracted codes from incorrectly extracted ones, and to determine the quality of user detection. The overall performance is studied using computer simulations.
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