Narula Institute of Technology

About: Narula Institute of Technology is a based out in . It is known for research contribution in the topics: Quantum dot cellular automaton & Cognitive radio. The organization has 288 authors who have published 490 publications receiving 2258 citations. The organization is also known as: NiT.

Semi-Isotropically Optimized Stewart Platform Manipulator Design with Actuator Stroke Constraint

Abstract: The isotropic property has been a general use in the context of kinematic design optimization of robotic manipulators In this paper, the semi-isotropic home or neutral configuration of a semi-regular Stewart platform manipulator has been designed by introducing the stroke constraint of all the legs through the assessment of new actuator variable termed as ‘fractional excess margin’ of actuation The constrained optimization problem structured with the quadratic functions relating all the rotational and translational motion of the tool center point and the actuator stroke The numerical solution obtained from the system of nonlinear equations has been interpreted graphically through the analysis of the ‘fractional excess margin’ for prescribed single degree of motions of Stewart platform manipulator Finally, a trade-off has been made between the goals of optimum semi-isotropic design configuration and that of the configuration with the actuators in the legs of the least stroke requirement

Comparative analysis of GA and SA for utility maximization of licensed and unlicensed users in a cognitive radio network

Abstract: In this paper we consider a cognitive radio network comprising of a number of primary users (PUs) and a number of secondary users (SUs). The spectrum has been divided into channels by means of frequency division multiple access (FDMA). The PUs have license to use the channels and the SUs periodically check the channels for idleness. When the channels are not in use by the PUs, the SUs may bid for them. The PUs auctions off the channels to the purchasers (SUs) who offer most money for them. Thus, PUs earn revenue in place of the spectrum. Here, we intend to compute an allocation of channels/vacant spectrums to the SUs such that the total revenue earned by all PUs is maximized. We also intend to compute another such allocation of channels/vacant spectrum to the SUs such that the payoff earned by the SUs is maximized. Both these optimizations have been performed with the help of real coded genetic algorithm (GA) and simulated annealing (SA) algorithm. We have made comparative analysis of both the algorithms and show that GA provides better near optimal solution compared to SA in terms of computation of a close to optimal solution. But, computational time of GA is more than that of SA. GA suffers from premature convergence, which can be dealt with SA.

Towards the Design of Cost-efficient Generic Register Using Quantum-dot Cellular Automata

Abstract: The advancement of VLSI in the application of emerging nanotechnology explores quantum-dot cellular automata (QCA) which has got wide acceptance owing to its ultra-high operating speed, extremely low power dissipation with a considerable reduction in feature size. The QCA architectures are emerging as a potential alternative to the conventional complementary metal oxide semiconductor (CMOS) technology. Since the register unit has a crucial role in digital data transfer between the electronic devices, such study leading to the design of cost-efficient and highly reliable QCA register is expected to be a prudent area of research. A thorough survey on the existing literature shows that the generic models of Serial-in Serial Out (SISO), Serial-in-Parallel-Out (SIPO), Parallel-In- Serial-Out (PISO) and Parallel-in-Parallel-Out (PIPO) registers are inadequate in terms of design parameters like effective area, delay, O-Cost, Costα, etc. This work introduces a layered T gate for the design of the D flip flop (LTD unit), which can be broadly used in SISO, SIPO, PISO, and PIPO register designs. For detection and reporting of high susceptible errors and defects at the nanoscale, the reliability and defect tolerant analysis of LTD unit are also carried out in this work. The QCA design metrics for the general register layouts using LTD unit is modeled. Moreover, the cost metrics for the proposed LTD layouts are thoroughly studied to check the functional complexity, fabrication difficulty and irreversible power dissipation of QCA register layouts.

An incentive driven reliable message exchange scheme in post-disaster situation using delay tolerant network

Abstract: In post-disaster situation, re-establishment of communication infrastructure is very critical task. For that delay tolerant network is used by smart phone users like volunteers or victims. In such fragile environment, data can be forwarded by store-carry-forward mechanism. So, for data delivery, multi-hop communication and proper cooperation among nodes are very important aspects. Volunteers are working by forming small groups. In such sensational environment secure and instantaneous group communication among volunteer nodes and to remote monitoring system is imperative as there can be various malicious nodes intentionally intercept and alter data for the purpose of fraudulence. So, proper mechanism is required to detect malicious nodes and encourage them to participate by giving them incentives. Here, the objective is to develop incentive based secure message exchange scheme for reliable data communication. Opportunistic network environment simulator is used for performance measurement.

High-resolution x-ray spectra from highly charged Si, S and Cl ions showing evidence of fluorescence active resonant states

Abstract: We have measured the x-ray spectra from highly charged Si, S and Cl ions in collisions with thin foils using a high-resolution x-ray spectrometer. The observed lines have been assigned to various transitions in H-, He- and Li-like ions. For proper identification of line positions, the theoretical calculations have been carried out using a state-of-the-art MCDF code including QED effects, with which the experimental data is in excellent agreement. We have also observed, for the first time, x-rays arising out of the decay of long-lived resonant states in the He-like ions of each species. Details will be presented.