gautam rana - Academia.edu (original) (raw)

Papers by gautam rana

This paper presents RF-MEMS devices, which are based on low-complexity fabrication technologies. ... more This paper presents RF-MEMS devices, which are based on low-complexity fabrication technologies. Tuneable filters and phase shifting elements for Ka-band have already been realized by using a fabrication process which requires only two photo-lithographic steps. Adding just one more lithographic process step results in the realization of high performance switching devices with insertion losses of -0.2dB at 30GHz. Due to their low fabrication complexity, all these RF-MEMS devices minimize technological challenges and have the potential for being highly reliable due to their design principle. In addition, these technologies may pave the way for the monolithic integration of RF-MEMS based circuits with compound semiconductor MMICs for highly integrated and high performance multi-functional circuits.

IEEE Aerospace and Electronic Systems Magazine, 2018

2016 European Radar Conference (EuRAD), 2016

This paper introduces an approach to combine a FMCW MIMO radar frontend with a communications dat... more This paper introduces an approach to combine a FMCW MIMO radar frontend with a communications datalink frontend all integrated in a single Printed Circuit Board (PCB). The chosen MIMO configuration allows to integrate communication antennas without increasing the size of the PCB. The system is all incorporated in a single planar PCB with 36 radiating elements, 16 for receive (RX) and 16 for transmit (TX) for the radar as well as 4 for communication purposes. In order to achieve more bandwidth of operation, Resonant Slot Patch Antennas (RSPA) for the radar, and spiral antennas for communication were designed. Electrical measurements of the radar frontend and the communication datalink were carried out with good results. To the best of the authors' knowledge this is the first time that available space in the center of the aperture of a MIMO array is used for a different RF functionality.

It is very important to forecast electricity price in a deregulated electricity market for choosi... more It is very important to forecast electricity price in a deregulated electricity market for choosing the bidding strategy, and it is the most important signal for other players. It engulfs information for both customers and producers in order to maximize their profit. Thus, choosing the best method of price forecasting is a crucial task to have the most accurate forecast. In this paper the price forecasting is done based on Neural Network (NN). The method is examined by using data of an electricity market. The results are compared and described well in the results section.

In this manuscript, the author has tried to analyze a study of Variable Frequency Drives. Variabl... more In this manuscript, the author has tried to analyze a study of Variable Frequency Drives. Variable frequency drives are energy saving drives. But they generate harmonics generates. Harmonics introduced by any means affect the performance parameters of any system The presence of harmonics is the system for a long duration & that, too, of higher order affect the various parameters in a Power distribution system. Harmonics change the shapes of current & voltage waveform there by affecting the overall power quality. In this work, it is concluded that Variable Frequency Drives introduce harmonics that affect the current signal waveform and increase Total Harmonics Distortion (THD). The results showed that by placing a three phase harmonic filter in the circuit where VFD is used for speed control of motor the THD is reduced considerably. This method of eliminating harmonics is a very cost effective and robust. It is also applicable in industries where VFDs are used for motor speed control...

Oxford Research Encyclopedia of Linguistics, 2019

The Early Modern interest taken in language was intense and versatile. In this period, language e... more The Early Modern interest taken in language was intense and versatile. In this period, language education gradually no longer centered solely on Latin. The linguistic scope widened considerably, partly as a result of scholarly curiosity, although religious and missionary zeal, commercial considerations, and political motives were also of decisive significance. Statesmen discovered the political power of standardized vernaculars in the typically Early Modern process of state formation. The widening of the linguistic horizon was, first and foremost, reflected in a steadily increasing production of grammars and dictionaries, along with pocket textbooks, conversational manuals, and spelling treatises. One strategy of coping with the stunning linguistic diversity consisted of first collecting data on as many languages as possible and then tracing elements that were common to all or to certain groups of languages. Language comparison was not limited to historical and genealogical endeavor...

As we are moving in a World of advancement, so the security is the major concern in order to keep... more As we are moving in a World of advancement, so the security is the major concern in order to keep data isolate from the unauthorised users to access. In today’s World, we need high degree security system for the protection of our document, important data, as well as memory and jewellery. This review paper presents a secure fingerprint locker which is feasible. This system is proved successful on all norms of security of lockers. There are other methods of verifying authentication through password, RFID but this method is most efficient and reliable. To provide perfect security to the lockers and to make the work easier, this project is taking help of two different technologies, i.e. Embedded System and Biometrics. Biometrics is basically the measurement and use of unique characteristics of living beings to make them distinguish from one another. And this is more reliable then passwords and tokens which can be lost or stolen by the humans. In this paper we are providing the work done...

Vanderbilt Journal of Transnational Law, 1997

2017 European Radar Conference (EURAD), 2017

Many Thanks! ChemCatChem has had aw onderful year and I would like to say ab ig thank you to our ... more Many Thanks! ChemCatChem has had aw onderful year and I would like to say ab ig thank you to our authors, referees, readers,and board members. It was great to meet up with you at conferencesa cross the world, especially at EuropaCat in Florence!Iappreciate all of the feedback and constructive criticism and Il ook forwardt oa nother year of fine interactions in 2018. Fearless Chairmen:L ast year we renewed our Chairmen-the founding Chairmen and leaderso fChemCatChem had served for eight years and we welcomed two new Chairmen in Stephen Hashmi and Hermenegildo Garcia. Uwe Bornscheuer remained to allow for some continuity,b ut now makes way for Wolfgang Kroutil. [1] On ar elatedn ote, we would like to welcome Dieter Vogt to the International Advisory Board after the retirement of Arno Behr.

International Journal of Climatology, 2020

Numerous satellite‐based precipitation datasets have been successively made available. Their prec... more Numerous satellite‐based precipitation datasets have been successively made available. Their precipitation estimates rely on clouds properties derived from microwave and thermal sensors in a so‐named ‘top‐down’ approach. Recently, a ‘bottom‐up’ approach to infer precipitation from soil moisture (SM) estimates has resulted in the release of two new precipitation datasets (P‐datasets). One uses satellite‐based SM estimates from the European Spatial Agency (ESA) Climate Change Initiative (CCI) (SM2RAIN‐CCI) while the other uses satellite‐based SM from European Organization for the Exploitation of Meteorological Satellites (EUMETSAT) Advanced SCATterometer (ASCAT) (SM2RAIN‐ASCAT). This study assesses SM2RAIN‐ASCAT and ‐CCI reliability over two arid regions: Bolivian and Peruvian Altiplano and Pakistan (South Asia) using (a) direct comparisons with rain gauges and (b) testing the sensitivity of streamflow modelling to the P‐datasets. Selecting two different regions and different indicators helps to assess whether the P‐dataset reliability varies depending on the assessment method and location. For comparison purposes, the most reliable P‐datasets from the literature are also considered (IMERG‐E v.6, IMERG‐L v.6, IMERG‐F v.6, CHIRPS v.2 and MSWEP v.2.2). Compared to rain gauge observations and based on the modified Kling–Gupta Efficiency (KGE) values, the SM2RAIN‐ASCAT and ‐CCI are more accurate in the Altiplano than in Pakistan. This difference is explained by a more favourable physical context for satellite‐based SM estimates in the Altiplano. Over the Altiplano and despite an overall positive bias, SM2RAIN‐ASCAT describes rain gauges temporal dynamics as well as IMERG‐F v.6, CHIRPS v.2 and MSWEP v.2.2 and provides streamflow simulations very close to those obtained when using IMERG‐F v.6, CHIRPS v.2 and MSWEP v.2.2 as forcing data.

2007 European Microwave Integrated Circuit Conference, 2007

A fundamental problem in debugging and monitoring is detecting whether the state of a system sati... more A fundamental problem in debugging and monitoring is detecting whether the state of a system satisfies some predicate. If the system is distributed, then the resulting uncertainty in the state of the system makes such detection, in general, ill-defined. This paper presents three algorithms for detecting global predicates in a well-defined way. These algorithms do so by interpreting predicates with respect to the communication that has occurred in the system. A fundamental problem in debugging and monitoring is detecting whether the state of a system satisfies some predicate. If the system is distributed, then the resulting uncertainty in the state of the system makes such detection, in general, ill-defined. This paper presents three algorithms for detecting global predicates in a well-defined way. These algorithms do so by interpreting predicates with respect to the commtmication that has occurred in the system. Briefly, the first algoritlma determines that the predicate was possibly true at some point in the past; the second determines that the predicate was definitely true in the past; while the third algorithm establishes "This work was supported by the Defense Advuced Rese_ch Projects Agency (DoD) under NASA Ames _ut number NAG 2-593, Contract N00140-87-C-8904, ud by grants from IBM and Siemens. The views, opinions, and findings contained in this report are those of the authors and should not be construeffas an official Department of Defense position, policy,or decision.This paper will appear in the Proceedings of the 1991 ACM/ONR Workshop on Parallel and D_tributed Debugging.

The POAM III satellite instrument was fully operational during the SOLVE2/VINTERSOL campaign (200... more The POAM III satellite instrument was fully operational during the SOLVE2/VINTERSOL campaign (2002/3 northern hemisphere winter), and sampled the vortex core, the vortex edge, and outside the vortex throughout this winter. In this paper we present an overview of POAM observations and analysis obtained during the SOLVE2/VINTERSOL winter. PSCs were observed quite frequently in the early part of the winter (through December). In fact, in the first half of December the PSC occurrence frequency was larger in the 2002/3 winter than that observed in any other POAM measurement year (POAM II: 1993/94-1995/96, and POAM III: 1998/99-2002/03). After a warming, which occurred in mid-January, PSCs were observed only episodically for the remainder of the winter, and the last POAM PSC observation was made on 21 March. From an analysis of PSC occurrence frequency as a function of UKMO temperature, we infer that the intense PSC activity in December resulted in extensive denitrification of the polar v...

Berg Encyclopedia of World Dress and Fashion

International Journal of Environment and Pollution, 2010

Computer Methods in Applied Mechanics and Engineering, 2003

In this paper, we adopt the first-order shear deformation theory in the moving least squares diff... more In this paper, we adopt the first-order shear deformation theory in the moving least squares differential quadrature (MLSDQ) procedure for predicting the free vibration behavior of moderately thick symmetrically laminated composite plates. The transverse deflection and two rotations of the laminate are independently approximated with the moving least squares (MLS) approximation. The weighting coefficients used in the MLSDQ approximation are obtained through the fast computation of the MLS shape functions and their partial derivatives. The natural frequencies of vibration are computed for various laminated plates and compared with the available published results. Through numerical experiments, the capability and efficiency of the MLSDQ method for eigenvalue problems are demonstrated, and the numerical accuracy and convergence are thoughtfully examined. Effects of the size of support, order of completeness of the basis functions and node irregularity on the numerical accuracy are also investigated.

German Microwave Conf

This paper presents a very low complexity RF-MEMS process with only one metallisation layer and s... more This paper presents a very low complexity RF-MEMS process with only one metallisation layer and some phase shifting applications produced in this technology. The MEMS are fabricated on silicon, with a bimorph metallisation. Affected by a mechanic stress gradient in the bimorph layer, free standing parts of the structure roll up. These bended beams can be switched onto the substrate by electrostatic actuation. Using these bended structures in a transmission line or a loaded line, the effective dielectricity of the line and thus the phase shift of the line is changed. The concepts of switchable loaded lines and switchable transmission lines are compared in terms of phase shift and insertion loss. A 20° phase shifter with IL < 0.5dB @ 30GHz is shown, produced in a MEMS process with only 2 lithographic steps.

2018 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2018

Wireless networks are growing in the value of application in many areas, in which accurate clock ... more Wireless networks are growing in the value of application in many areas, in which accurate clock synchronization is required when tasks are performed in a collaborative fashion among nodes. Especially, cooperative synchronization techniques lead to significant performance improvement compared with traditional methods. However, the correlation among agents renders the performance analysis of cooperative network synchronization difficult. In this paper, we introduce the concept of information coupling intensity to the analysis of interaction between agents. Our approach enables us to derive closed-form asymptotic expressions under specific network topologies, and relate them to various network parameters.