The current issue of the IETE Journal of Research (Vol. 63, No. 6, Nov-Dec 2017) contains 13 articles. These articles present on-going research and developments taking place in the broad areas of Biomedical Engineering, Electromagnetics, Communication Engineering, Computer Science & Engineering, and Power Systems.
The paper titled “A new dynamic synchrophasor estimator for digital relaying,” gives a method for improved phasor estimation for transmission line protection. The method is based on the classical Taylor – least error squares algorithm and is based on the fundamental phasor estimation and decaying DC and harmonics components estimation. The performance is evaluated in simulation environment and through comparison with other algorithms.
In “An iterative implementation of level set for precise segmentation of brain tissues and abnormality detection from MR images,” an algorithm for the precise segmentation of normal and abnormal tissues in magnetic resonance imaging of brain is presented. The segmentation is based on iterative three region level set methods and hierarchical structure. The performance is evaluated using accuracy similarity index and relative error over a defined set of the MRI image and compared with other algorithms from the literature.
The paper on “Application of artificial neural network and adaptive neuro-fuzzy inference system for the modeling and simulation of QCA circuits,” uses ANN and ANFIS for modeling and simulating quantum-dot cellular automata (QCA) circuits. The components used in QCA are modeled using ANN and ANFIS. QCA logic circuits are designed by importing these models in HSPICE. The paper gives the accuracy and performance using some circuits. Also, the simulation efficiency is compared with QCADesigner.
The paper on “Capacity analysis of MIMO in non-uniform Nakagami channel with linear receiver,” presents the performance analysis of MIMO system in correlated non-uniform phase distributed Nakagami-m channel with a linear receiver. The effect of channel correlation on the capacity is analyzed. Also, the effects of Doppler shift and Nakagami-m fading parameter on the channel ergodic and outage capacity are analyzed. Several simulation results are presented for illustration.
In the paper “Compact planar UWB antenna with enhanced bandwidth and switchable band-notch function for WLAN and DSRC,” a planar switchable antenna with band-notched and multi-resonance performance is presented. The antenna has compact dimensions and the simulated and experimental performance in the ultra-wideband frequency bandwidth is compared.
In the following paper titled “Analytic hierarchy process-based cell ranking in cellular networks using continuous cellular statistical measure technique for telemedicine applications,” a technique of continuous cellular statistical measure for optimal cell selection is presented. The measure uses Call blocking ratio, SINR, and inter-cell Analytic hierarchy process-based cell ranking in cellular networks using continuous cellular statistical measure technique for telemedicine applications interference to rank cells. The ranking is transmitted to all cells for optimal cell selection. The technique reduces the handover during transmission of real-time critical data.
The paper titled “Contourlet transform with sparse representation-based integrated approach for image pan-sharpening,” presents a method for pan sharpening based on the contourlet transform and its sparse representation. The method improves the spatial resolution of the synthesized multispectral image and also preserves the original spectral resolution. The results are compared with other pan-sharpening techniques such as the wavelet transform with sparse representation through subjective visual comparisons and objective performance measures.
In the paper “Energy efficient event detection using probabilistic inference in wireless sensor networks,” a scheme for delay-based event detection is presented to minimize in-network traffic and optimize the overall energy consumption of a deployed network. A fitness function is used to obtain the optimal data transmission path to the sink. A Markov random field model of the sensor network is used. The performance is evaluated through simulation studies in terms of detection accuracy, communication cost, delivery delay, network energy and packet delivery ratio.
The next paper titled “Modelling facial features for emotion recognition and synthesis,” presents a method for the recognition of emotion from facial feature deformations. The features used in the modeling process include the lip, nose, eyes and eyebrows. The change is detected using landmark points. Thin plate spline is used for modeling deformations of the landmark points. The performance of the method is evaluated on image databases and inferences are drawn from comparisons with other methods.
The next paper on “NAC-based synchronization and anti-synchronization between hyper-chaotic and chaotic systems, its analogue circuit design and application,” presents an analogue circuit design for secure communication based on chaos theory. The synchronization and anti-synchronization between a hyper-chaotic system and a chaotic system is considered using a nonlinear active control scheme. The two tasks of synchronization and anti-synchronization are stated and studied on specific systems. The secure communication application is studied in simulation environment and a circuit realization is studied and discussed.
In the paper “New copyright protection scheme for digital images based on visual cryptography,” a method is presented for blind watermarking using visual cryptography for copyright protection of digital images. The algorithm for the given method is studied and compared with other visual cryptography based watermarking methods. Its robustness to different attacks on various types of images is reported.
The next paper titled “Optimal design of single and multi-ring planar array antenna using simplex-PSO,” gives the design of a single-ring and multi-ring circular array, hexagonal array, and elliptical array for isotropic antenna. The design is optimized using simplex particle swarm optimization (Simplex-PSO). Design examples are discussed in terms of achieving the design parameters through the Simplex-PSO optimization method, and the advantage of the given design methodology over other optimization methods is presented.
In “Polarimetric parameters to categorize normal and malignant thyroid tissue,” the authors study images for their polarized light scattering from normal and malignant thyroid tissue samples. The study is used to categorize the two tissue types and to understand the structural and morphological changes in the samples. Inferences are drawn from the study.