Studies on performance parameters of a practical transformer for various utilizations

This work has been conducted at the electrical machines lab in European University of Bangladesh (EUB) for both the experimental and analytical determination of the performance parameters of the transformer for practical utilization. No-load and short-circuit tests were done for calculating the various performances parameters, such as core loss(Hysteresis loss and Eddy current loss), winding copper loss (I²R loss), no load current (I_o),active component of no load current (I_w),magnetizing component of no load current (I_µ), no load resistance (R_o), no load reactance (X_o), equivalent resistance referred to primary (R₀₁), reactance referred to primary (X₀₁) and impedance referred to primary (Z₀₁) and efficiency (η) of the practical transformer. Insulation resistance test was done to check the insulation level, which can identify the presence of major faults. The vector group tests also performed to identify the group numbers for various connection facilities of practical transformer. The subject under consideration was a 1.5 kVA small size, dry type practical transformer. This type of research work like 1.5 kVA practical transformer is not yet done before anywhere. This study will be the guide line for practical utilization of transformer for different purposes.

     

RAM: resource allocation in MIMO–MISO cognitive IoT for 5G wireless networks using two-level weighted majority cooperative game

Cognitive Internet of things (CIoT) is the solution for resource allocation problem in an exponentially increasing number of Internet of things in fifth generation wireless networks. Two-tier massive multiple-input-multiple-output (MIMO) and multiple-input-single-output small cell-based CIoT using weighted majority cooperative game (WMCG) is deployed in RAM. We have proposed a two-level WMCG theoretic model and two utility functions, to detect the channel is free or not and for allocating the spectrum to a high majority CIoT device by the spectrum manager based on their applied maximum weight or price values. In RAM, we have calculated power consumption, signal-to-interference-plus-noise ratio (SINR), spectral efficiency, and energy efficiency of the proposed network. We have simulated the RAM using QualNet 7.1 simulator. The power consumption of the RAM has been shown to decrease by approximately 15–30%, and SINR has been shown to increase by approximately 6–7% as compared to the existing approaches.

     

Design of low power,high speed 4 bit binary to Gray converter with 8 × 4 barrel shifter using nano dimensional MOS transistor for arithmetical,logical and telecommunication circuit and system application

In this work the design of 4 bit binary to Gray code converter circuit with 8 × 4 barrel shifter has been carried out. The circuit has been designed using metal oxide semiconductor (MOS) transistor. The verification of the functionality of the circuits has been performed using Tanner-SPICE software. Power consumption and speed are the major design metrics for very large scale integrated circuit. In this work the average power consumption and gate delay analysis of 4 bit binary to Gray converter with 8 × 4 barrel shifter has been carried out using nano dimensional MOS transistor having channel length of 150 nm. Power consumption, delay analysis has been carried out for different set of supply voltage. It has been observed that power consumption of the 4 bit binary to Gray converter with 8 × 4 barrel shifter has been reduced by reducing the power supply voltage V_DD. The power consumption and delay offers by the circuit is very less. At 1 V V_DD, power consumption and delay are 0.15 μW and 52.7 ps respectively. Therefore the circuit is suited for low power and high speed application in the area of arithmetical, logical and telecommunication.

     

Insight into molecular interactions between constituents in polymer clay nanocomposites

The mechanisms responsible for the enhancement of physical properties of polymer clay nanocomposites (PCN) over pristine polymers are not well understood. This knowledge is important for obtaining a better control over the physical properties of PCN and designing PCN with tailored properties. The interactions among the different constituents of PCN may be a key factor for controlling physical properties of PCN. The interaction energy is an important measure of the interactions among different constituents of composites. Molecular dynamics (MD) is a useful tool for studying the nature and quantitative analysis of interaction energies of a molecular system. In this work, the interaction energies among different components of intercalated organically modified montmorillonite (OMMT) and PCN have been investigated. Here, the interaction of polymer or organic modifier with clay and polymer and modifier is studied. Also, the nature and quantitative contributions arising from functional groups or backbone chain have been assessed. This investigation provides important insight into the mechanism of intercalation, and specific information about the interactions of different constituents in the nanocomposites system. In this current work using MD, for the first time, we have provided a detailed quantitative picture of interactions among the different components of OMMT and PCN.     

PROBABILITY-ONE HOMOTOPY ALGORITHMS FOR ROBUST CONTROLLER SYNTHESIS WITH FIXED-STRUCTURE MULTIPLIERS

Continuation algorithms that avoid multiplier–controller iteration have been developed earlier for fixed-architecture, mixed structured singular value controller synthesis. These algorithms have only been formulated for the special case of Popov multipliers and rely on an ad hoc initialization scheme. In addition, the algorithms have not used the prediction capabilities obtained by computing the Jacobian matrix of the continuation (or homotopy) map, and have assumed that the homotopy zero curve is monotonic. This paper develops probability-one homotopy algorithms based on the use of general fixed-structure multipliers. These algorithms can be initialized using an arbitrary (admissible) multiplier and a stabilizing compensator. In addition, as with all probability-one algorithms, the homotopy zero curve is not assumed to be monotonic and prediction is accomplished by using the homotopy Jacobian matrix. This approach also appears to have some advantages over the bilinear matrix inequality (BMI) approaches resulting from extensions of the LMI framework for robustness analysis. © 1997 by John Wiley & Sons, Ltd.     

TTCBT: two tier complete binary tree based wireless sensor network for FSR and LANMAR routing protocols

Microsystem Technologies - Wireless sensor network is extensively used for monitoring and surveillance systems. The primary challenges encountered in the area are energy minimization as well as...     

Tea leaf disease detection using multi-objective image segmentation

Multimedia Tools and Applications - Tea leaves’ diseases caused by constant exposure to pathogens lead to significant crop yield loss globally. Diagnosing the tea leave disease at an early...     

Energy and Spectrum Optimization for 5G Massive MIMO Cognitive Femtocell Based Mobile Network Using Auction Game Theory

Wireless Personal Communications - Energy and spectrum optimization for massive multiple input multiple output (MIMO) cognitive femtocell based fifth generation (5G) mobile network is developed...     

Design of Green Smart Room Using Fifth Generation Network Device Femtolet

Wireless Personal Communications - Designing smart room with energy-efficient data and application offloading facilities for the users is a crucial issue. This paper has proposed the architecture...