41 research outputs found
IMPLEMENTATION AND DESIGN OF 64 BIT REVERSIBLE ALU
No full textArea, delay, power are the major factors which effect the performance of today’s digital revolution. Power dissipation is one of the most common problem in digital circuits, many low power methodology techniques are been implemented to reduce power dissipation but still the ease of optimizing the design power is left behind. So here we consider, Reversibility which plays an important role in power consumption. Reversible logic reduces the power by preventing the loss of information. This paper proposes design of 64 bit ALU. This ALU consists of nine operations, four arithmetic and five logical operations. The arithmetic operations include addition, subtraction, multiplication, division and the logical operations include XOR, NOT, OR, NAND, AND. All the modules were designed using reversible logic gates where the divider circuit uses adder/sub module in doing division. All the modules are designed for n-bit operations. Initially n was taken as 16 bit and all the modules were tested in NEXYS 4 DDR board, based on FPGA from XILINX , Then the n is assigned as 64 bit operations .We were unable to implement 64 bit operations directly on FPGA because there were no resources to implement 64 bit operations .So we implemented 16 bit operations on the board and verified simulations for 64 bit operations. But these can also deal with n-bit operations. The delay and power analysis of various modules are performed along with comparison tables are carried out in this design
Exploiting multi-path for safeguarding mmWave communications against randomly located eavesdropper
No full textCommunication in the millimeter-wave (mmWave) band has enabled giga-bit-per-second data rates for next generation wireless systems. To this end, physical layer security techniques have emerged as a simple and yet effective way to safeguard these systems against eavesdropping attacks. These techniques make use of the large antenna arrays available in mmWave systems to provide an array gain at the target receiver and obfuscate the signal at the eavesdropper. Despite their effectiveness, majority of these techniques are based on line-of-sight communication links between the transmitter and the receiver, and may fail in the presence of blockages or non-line of-sight links. In this project, we propose a new physical layer security technique to safeguard communication systems against randomly located eavesdroppers. Numerical results demonstrate the effectiveness of proposed technique and show that higher secrecy rate can be obtained when compared to recently proposed techniques
Operational strategies for HVDC transmission in smart grids: the security versus markets dilemma
No full textOver the last decades, the European transmission system has made many profound changes in the network and has focused on three main concepts: i) flexibility, ii) integration, and iii) sustainability to increase the technological innovations, and to improve the market design. The currently used methodby transmission system operators (TSOs) is trying to accomplish these requirements, but it is important to realize that each TSO has its own grid protocols and standards. Consequently, all major TSOs in the interconnected meshed European transmission system are facing a huge difficulty in maintaining a strong operational coordination to work together as a one single European technical market model. In order to guarantee the highest security of electricity supply, it is necessary to structure a stable, reliable and secure analytical AC framework that takes into consideration the stochastic nature of system in-feeds in the daily operational planning. In this thesis it is analyzed how incorporation of smart technologies such as HVDC transmission can be used as a smart grid solution to improve the power system security and lower the risk in different adjacent areas/zones. The proposed risk-based security assessment (RBSA) methodology based on Monte-Carlo sampling is employed to investigate the security of the system and to quantify the expected system risk. It is shown that the market optimal HVDC power set-points may result in unnecessarily high risk when subjected to the unavoidable uncertainty of inputs(fluctuations in load and RES) inherent to day-ahead forecasting. A detailed comparison of market optimal versus security optimal HVDC power set-point is presented. It is proposed to properly adapt the HVDC set-points with respect to the actual operating situation, which can be quite different from the day-ahead point forecast. Moreover, it is shown that by being able to adapt HVDC set-points in realtime operation, further more serious and more costly remedial actions such as active re-dispatch and load shedding, can be avoided. Furthermore, a study with two HVDC transmission lines is performed to show the necessity of coordinated control of the HVDC lines, and how this can reduce the stress in the network by acting as a tool to shift generation.Electrical Engineering | Sustainable Energy Technolog
The City as Medusa, Grandma and Whore in Arundhati Roy's The Ministry of Utmost Happiness
No full textThe paper assesses the city of Delhi as it is perceived and depicted in The Ministry of Utmost Happiness, the second novel of Booker-prize winning author, political essayist and writer-activist Arundhati Roy and the ways in which it challenges a hegemonic perception of urban spaces and through these spaces, the perception of a developing nation in an age of neoliberal capitalism and globalization in the free market. The paper underscores the various metaphors, figurative allusions and the shifting personas the city acquires and the gendering and transitioning it undergoes at the hands of the author. Likewise, the paper attempts an understanding of the city as a many-layered, living, breathing entity with surprises and secrets, celebrations and heartbreaks, as much a character and as human with an intimate and intense subject status as any of the inmates inhabiting it. It looks at the city space as an empowering and enabling agency offering shelter, variety, anonymity and opportunity to those who seek it and the cityscape as frequently alienating, ruthless and indifferent, foregrounding the juxtaposition of these two sharply contrasting images and the symbolic significance of them
A subspace approach to blind space-time signal processing for wireless communication systems
No full text
Business excellence models and the path ahead …
No full textPurposeQuality research has paved the way for the evolution of several business excellence models/national quality awards (BEMs/NQAs). This paper aims to review the evolution of BEMs/NQAs and takes a comparative view on these models. It also throws some light on the emerging scenario.Design/methodology/approachThis study is based on information gathered through an extensive literature review using print media and research databases like Emerald, EBSCO and Pro‐Quest. Discussions with experts helped in reviewing the effectiveness of BEMs and visualising the emerging scenario.FindingsA paradigm shift has been witnessed in the understanding of quality. Although MBNQA, EFQM and the Deming Prize are the three globally accepted major BEMs, some unique models are also emerging. The paper identifies 100 BEMs/NQAs being used across the world. They are subject to changes according to the evolution of the external environment and are considered a contemporary way to attain excellence. The benefits and limitations of BEMs are identified. BEMs need to be fine‐tuned by incorporating lessons from ancient teachings to attain “sustained business results”.Research limitations/implicationsAlthough this paper identifies 100 BEMs/NQAs, the author has limited access to the details of these models. While details of some NQAs are available on the web in the native languages of their respective countries, many BEMs/NQAs have limited information in the public domain. Further to this, rapid changes in BEMs/NQAs in line with the evolution of the external environment makes this study even more difficult. Future research may attempt to overcome some of these limitations.Practical implicationsThe study is expected to help in reviewing national business excellence strategies. The effectiveness of BEMs/NQAs needs to be examined empirically for sustained results. Ancient teachings provide the clues for sustainable growth.Originality/valueThis paper is based on literature review and interaction with experts. The paper provides a worldwide analysis of BEMs/NQAs and suggests a few emerging dimensions of excellence.</jats:sec
