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Search Results: 1 - 10 of 129 matches for " Kriti Saraswat "
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Kriti Saraswat,Ajit Kumar Shrivastava,Amit Saxena
International Journal of Computers & Technology , 2012,
Abstract: Dense deployment of cellular networks is leading to scarcity of communication bandwidth or what we call as channel. If compared to its wired counterparts, wireless cellular network have limited number of channels available, which gives rise to problem of efficient channel allocation. Here, in this piece of work, the main objective is to put an effort to improve existing channel allocation scheme. In earlier existing hybrid allocation scheme, the base station notifies about the hot-spots to the Mobile Switching Centre (MSC) and if MSC has available channels in its central pool then it satisfies the request. Now, the novelty of this work starts where central pool gets exhausted and request of channels from base station (BS) still arrives and is served by returning the unused channels by different cells back to MSC on its request. The simulation of this approach is expounded and evaluated over OMNeT++ in a scenario with fixed channel allocation and hybrid approach by varying the proportion of dynamic channels to total number of channels available and the effectiveness is evaluated in terms of Call blocked and Call dropped versus System load.
Evolutionary Programming for Systematic Evaluation of Aquifers: A Case Study from Dholera, Cambay Basin, Gujarat, India  [PDF]
Kriti Yadav, Anirbid Sircar
Journal of Geoscience and Environment Protection (GEP) , 2019, DOI: 10.4236/gep.2019.74009
Abstract: Joint inversion of different potentials improves subsurface model resolution. In this paper seismic refraction and magnetotelluric data are used to understand near subsurface features of Dholera, Gujarat, India. An extensive seismic and magnetotelluric survey was carried out in Dholera in order to delineate subsurface presence of aquifers. Ray Inversion for Near Surface Estimation (RINSE) is used for inversion of Dholera seismic data. The inversion output of seismic data is used as seed points for resistivity inversion of anomalies. Inversion of resistivity data is done using evolutionary programing method which is also a type of genetic algorithm. Here the optimization is done using four major steps, of evolutionary programing namely population generation, fitness function, crossover and mutation. This paper also compares the similarities between the natural and geophysical optimization. A Low Velocity Layer is identified up to a depth of 11 m from seismic refraction method. Three layers are identified after the interpretation of seismic and resistivity data. The average thicknesses of Layers one and two are calculated as 3.558 and 6.533 respectively.
Long-Term Changes in Night Time Airglow Emission at 557.7 nm over Mid Latitude Japanese Station i.e., Kiso (35.79oN, 137.63oE)  [PDF]
Brij Mohan Vyas, Vimal Saraswat
American Journal of Climate Change (AJCC) , 2012, DOI: 10.4236/ajcc.2012.14018

The present study describes the long-term changes in Pre-midnight and Midnight airglow intensities of 557.7 nm during the period 1979-1994 over mid latitude Japanese station i.e., Kiso, Tokyo Astronomical Observatory, University of Tokyo (35.79oN, 137.63oE; 1130 m), Japan. It has observed that there is a positive increasing decadal change in Midnight and Pre-midnight mesospheric airglow intensity of the range 25 - 88 R. This range is the order of 10 to 30% of the observed MARV and average night airglow intensity of 250 R. Besides this long-term trend, inter-annual monthly variation is also seen from fluctuation of yearly variation of deviation values from MARV to particular average monthly values. The present observations about the positive decadal change in night time mesospheric airglow intensity has been further linked to the reduction of mesospheric electron densities and temperature or shrinking and cooling of the lower ionosphere as established from the long-term behavior of mesospheric parameters such as a negative decadal change in thermal structure, electron density, neutral density parameters as per studies reported by other researchers.

Role of Silver Incorporation on the Specific Heat in Glassy Se80Te20 Alloy  [PDF]
Shipra Saraswat, Surendra Dutt Sharma
New Journal of Glass and Ceramics (NJGC) , 2014, DOI: 10.4236/njgc.2014.44009
Abstract: Specific heat measurements have been made in glassy Se80-xTe20Agx (0 ≤ x ≤ 15) alloys using differential scanning calorimetry (DSC) technique. An extremely large increase in the specific heat values has been observed at the glass transition temperature. It has also been found that the values of Cp below glass transition temperature and the difference of Cp values before and after glass transition (ΔCp) are highly composition dependent. This indicates that the incorporation of Ag in binary Se80Te20 alloy in the present study influences the structure of the binary alloy. Specific heat of the additive element Ag is found to be important for the observed changes in the specific heat of the ternary alloys as compared to binary alloy.
Topical corticosteroid use in children: Adverse effects and how to minimize them
Saraswat Abir
Indian Journal of Dermatology, Venereology and Leprology , 2010,
Free Final-Time Optimal Control for HIV Viral Dynamics
Gaurav Pachpute,Kriti Saxena
Mathematics , 2011,
Abstract: In this paper, we examine a well-established model for HIV wild-type infection. The algorithm for steepest descent method for fixed final-time is stated and a modified method for free final-time is presented. The first type of cost functional considered, seeks to minimize the total time of therapy. An easy implementation for this problem suggests that it can be effective in the early stages of treatment as well as for individual-based studies, due to the "hit first and hit hard" nature of optimal control. An LQR based cost functional is also presented and the solution is found using steepest descent method. It suggests that the optimal therapy must remain high until the patient shows signs of recovery after which, the therapy gradually decreases. This is in line with the biomedical philosophy. Solution to a modified problem which includes a weight for total time is approximated using the modified algorithm. It shows a considerable drop in the total period. We conclude that, a decreased and optimized therapy period can help us increase efficiency as well as the turnover rate for patient care.
GINI: From ISH Images to Gene Interaction Networks
Kriti Puniyani,Eric P. Xing
PLOS Computational Biology , 2013, DOI: 10.1371/journal.pcbi.1003227
Abstract: Accurate inference of molecular and functional interactions among genes, especially in multicellular organisms such as Drosophila, often requires statistical analysis of correlations not only between the magnitudes of gene expressions, but also between their temporal-spatial patterns. The ISH (in-situ-hybridization)-based gene expression micro-imaging technology offers an effective approach to perform large-scale spatial-temporal profiling of whole-body mRNA abundance. However, analytical tools for discovering gene interactions from such data remain an open challenge due to various reasons, including difficulties in extracting canonical representations of gene activities from images, and in inference of statistically meaningful networks from such representations. In this paper, we present GINI, a machine learning system for inferring gene interaction networks from Drosophila embryonic ISH images. GINI builds on a computer-vision-inspired vector-space representation of the spatial pattern of gene expression in ISH images, enabled by our recently developed system; and a new multi-instance-kernel algorithm that learns a sparse Markov network model, in which, every gene (i.e., node) in the network is represented by a vector-valued spatial pattern rather than a scalar-valued gene intensity as in conventional approaches such as a Gaussian graphical model. By capturing the notion of spatial similarity of gene expression, and at the same time properly taking into account the presence of multiple images per gene via multi-instance kernels, GINI is well-positioned to infer statistically sound, and biologically meaningful gene interaction networks from image data. Using both synthetic data and a small manually curated data set, we demonstrate the effectiveness of our approach in network building. Furthermore, we report results on a large publicly available collection of Drosophila embryonic ISH images from the Berkeley Drosophila Genome Project, where GINI makes novel and interesting predictions of gene interactions. Software for GINI is available at http://sailing.cs.cmu.edu/Drosophila_ISH?_images/
Dielectric Properties of PbNb2O6 up to 700°C from Impedance Spectroscopy
Kriti Ranjan Sahu,Udayan De
Journal of Materials , 2013, DOI: 10.1155/2013/702946
Abstract: Piezoelectric materials have wide band gap and no inversion symmetry. Only the orthorhombic phase of lead metaniobate (PbNb2O6) can be ferroelectric and piezoelectric below Curie temperature, but not the rhombohedral phase. High temperature piezoelectric applications in current decades have revived international interest in orthorhombic PbNb2O6, synthesis of which in pure form is difficult and not well documented. Second problem is that its impedance spectroscopy (IS) data analysis is still incomplete. Present work attempts to fill up these two gaps. Presently found synthesis parameters yield purely orthorhombic PbNb2O6, as checked by X-ray Rietveld analysis and TEM. Present 20?Hz to 5.5?MHz IS from room temperature to 700°C shows its ferroelectric Curie temperature to be one of the highest reported, >574°C for 0.5?kHz and >580°C for 5.5?MHz. Dielectric characteristics and electrical properties (like capacitance, resistance and relaxation time of the equivalent CR circuit, AC and DC conductivities, and related activation energies), as derived here from a complete analysis of the IS data, are more extensive than what has yet been reported in the literature. All the properties show sharp changes across the Curie temperature. The temperature dependence of activation energies corresponding to AC and DC conductivities has been reexamined. 1. Introduction A generator of pressure or movement or ultrasonic wave and their sensor/detector can be fabricated utilizing inverse and direct piezoelectric effect, respectively. These possibilities opened up a huge array [1] of medical, industrial, and other applications of piezoelectric materials with significant commercial implications. Commercial piezoelectric materials have mostly been barium titanate (BT), lead zirconate titanate (PZT), or materials based on BT or PZT. But Curie temperature ( ), the upper limit for piezoelectricity, is at best 130°C [2] for BT and 365°C for a modified PZT. So, higher materials are being developed worldwide for high temperature (HT) applications. Lead metaniobate (PbNb2O6), shortened here as PNO, with a higher Curie temperature (517 to 570°C in different papers), is one of the present candidate materials [2–14]. It was discovered [3] in 1953. However, synthesis of its piezoelectric phase, the metastable orthorhombic structure, in a pure state is difficult [4]. During the preparation of the orthorhombic PNO by quenching from a temperature above 1250°C, a few competing compounds and phases (like the rhombohedral PNO phase) tend to form. The rhombohedral PNO is not piezoelectric. In
Dielectric Properties of Rhombohedral
Kriti Ranjan Sahu,Udayan De
Journal of Solid State Physics , 2013, DOI: 10.1155/2013/451563
Abstract: Dielectric materials are needed in many electrical and electronic applications. So, basic characterizations need to be done for all dielectrics. (PN) is ferroelectric and piezoelectric only in its orthorhombic phase, with potential high temperature applications. So, its rhombohedral phase, frequently formed as an undesirable impurity in the preparation of orthorhombic PN, has been ignored with respect to possible dielectric characterizations. Here, essentially single phase rhombohedral PN has been prepared, checking structure from XRD Rietveld Analysis, and the real and imaginary parts of permittivity measured in an Impedance Spectrometer (IS) up to ~ and over 20?Hz to 5.5?MHz range, for heating and some cooling runs. Variations, with temperature, of relaxation time constant ( ), AC and DC conductivity, bulk resistance, activation energy and capacitance have been explored from our IS data. 1. Introduction Commercial piezoelectric (PE) materials for applications in medicine, industry, and research have mostly been barium titanate (BaTiO3), lead zirconate titanate (Pb[ZrxTi1-x]O3, , or PZT), or materials based on one of these. But Curie temperature, the upper limit for piezoelectricity, is at best 130°C [1, 2] for the former and 390°C [2] for a specially modified PZT. Now, certain modern high temperature applications in industry need higher Curie temperature and, hence, newer materials with higher Curie temperature and suitable PE properties. This growing need for high temperature piezoelectric sensors and actuators [1, 2] has revived, in last few decades, a worldwide interest in lead niobate (PbNb2O6, to be shortened here as PN) in orthorhombic structure, which alone is piezoelectric. It was discovered [3] in 1953 but almost ignored for decades after a wave of pioneering work [3–5] of high quality. PN and PN-based ferroelectric samples involving chemical substitution &/or composite formation [6–8] are now being investigated by different groups, while present work is on pure PbNb2O6 in rhombohedral form. PbNb2O6 has different structures as already indicated. The stable forms of PbNb2O6 are [3–5, 9] rhombohedral (at low temperature) and tetragonal (at high temperature). The latter is transformed, usually by quenching ( ), to PNQ, the metastable orthorhombic PbNb2O6, which alone can be made piezoelectric (fortunately with a high Curie temperature higher than 580°C for 5.5?MHz, e.g., [9]). Slow ( ) cooling (from temperatures like 1270°C) leads [10, 11] to PNS, rhombohedral PbNb2O6, which is not ferroelectric; ruling out piezoelectric properties and
Ambush Marketing concept, framework with special reference of ICC Cricket world cup 2011
Dr. Pranav Saraswat
International Journal of Knowledge and Research in Management and E-Commerce , 2011,
Abstract: As a result of the growth of sponsorship the emergent prominence of ambush marketing is increased. The academic study of ambushing has a developed as a contemporary concern of various sports event. Unfortunately, to date no conceptualization of ambush marketing exists, and our understanding of ambushing is grounded in studies conducted two decades ago, which arguably do not adequately represent the evolution of ambushing, and the ensuing concerns and issues raised, over the past twenty years. It is in the aim of addressing these limitations that this study endeavors to expand upon our understanding of ambushing, analyzing the methods and the burning issue of ICC Cricket world cup 2011 sponsorship.
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