Title: Implementation of Multi-Level Inverter Based Direct Torque Control of Induction Motor Using Fuzzy Logic Controller
Authors: Vinod Kumar. R and Pandian. A
Abstract: Induction motor is the heart of the automation industry. It is widely used for its simple and robust structure. The Fuzzy Logic Direct Torque Control [FL-DTC] is popularly used because of its simple control structure. The Fuzzy Logic is used to efficiently analyze the errors. It is used in applications like traction which require high torque even at low speed. The control technique is simple and similar to that of Field-Oriented Drive. The control is achieved by varying switching pulse of the inverter. The switching sequence depends on torque and flux errors obtained from the output of the induction motor.
Title: Microcontroller Based Soft Switching For Boost Converter with Improved THD
Authors: Sam Edwin Moses.E and Sathish.R
Abstract: DC power supplies are non ? linear system when they are connected across a load. The power factor is low and their Harmonics (THD) is high, resulting in poor quality of DC power supply. In order to improve power factor and Harmonics (THD) active power factor corrector (PFC) is used. Mostly PFC will be buck-boost topology with hard switching. In order to improve more in power factor and decreasing the total harmonic distortion (THD), hybrid (zvzcs) soft switching method using microcontroller is proposed in this paper.
Title: Minimization of Switching Activities of Partial Products for Designing Low Power Digital Multipliers Using 3 Different Adder Cell
Authors: J.Vivek Kumar, B.M.Prabhu and Dr.S. Padma
Abstract: This article presents the design of multiplier. It means to perform a repeated addition while processing the addition we can get a multiplier and the performance of any processor or controller will depend upon its power, size and delay. So the power, size and delay should be less in order to get an effective processor or controller. Each and every processor has ALU (Arithmetic logic units). That arithmetic operation includes Addition, Subtraction, Multiplication, Division, shifter and many units. Multiplication is an important function in arithmetic operations, and it is more complex to develop the next level of bits. To illustrate the proposed multipliers exhibiting low power dissipation, the theoretical analyzing switching activates of partial products are derived and it is also used in DSP, multiplication process is used in many application like measurements and instrumentation applications such as filters, communication, Image processing, Robotics, Intelligence of embedded systems, special effects and graphics etc., The multiplier circuits are schematized and their layouts are design and generated by using VLSI CAD tools.
Title: Reduce the End ?to-end Delay and increase Network Lifetime in Mobile Adhoc Network using NS-2
Authors: Abhishek Saxena, Shailendra Kumar Gupta and Dr. Narendra Singh Yadav
Abstract: In this paper, we present a cooperative transmission approach to reduce the end-to-end delay in the context of DSR based multi hop wireless networks. Some of the routing algorithms in mobile ad hoc networks use multiple paths simultaneously. These algorithms can attempt to find node-disjoint paths to achieve higher fault tolerance capability. Dynamic Source Routing (DSR) is a source routing protocol for ad hoc networks. The algorithm of DSR depends of DSR on the supportive contribution of the nodes that enables route discovery from a source node to a destination node. The end-to-end delay between any source and destination depends on the pattern of communication in the neighborhood region. In this case some of the intermediate nodes should be silent to reverence their neighbors and this matter increases the average of end-to-end delay. To escape from this attack we introduced a personalized dynamic source routing protocol which perform better compare to dynamic source routing protocol with selfish and inimical nodes. To avoid this problem, multi-path routing algorithms can use zone-disjoint paths instead of node-disjoint paths. For the implementation and analyze the performance NS-2.34 was used. For comparison of the both routing protocols throughput, end to end delay, PDR, packet loss and routing overhead parameters are used with Random waypoint mobility model. The simulation results show that the proposed approach is very effective in decreasing delay and packet loss.
Title: Spintronics Devices and Materials- A Review
Authors: Stuti Ramola
Abstract: Spintronics deals mainly with the science and technology of using the spin degree of freedom of a charge carrier for various applications such as storing, encoding, accessing, processing and to transmitting information in some manner. However, such role had been traditionally delegated to the charge of the electron rather than the spin of the electron. Interest in spintronics is encouraged by replacing the charge with spin .The various devices working under this principles include spin transistors(both BJTs and FETs), various types of spin light-emitting diodes, spin filtering, spin valve, spin tunnelling and sensor devices and the fabrication of various spintronics materials using different techniques like physical vapour deposition and lithographic techniques.