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First and Second Order Statistics Features for Classification of Magnetic Resonance Brain Images

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Journal of Signal and Information Processing 2012年第2期3卷 146-153页

作者： Namita aggarwal R. k. Agrawal School of Computer and Systems Sciences Jawaharlal Nehru University New Delhi India

In literature, features based on First and Second Order Statistics that characterizes textures are used for classification of images. Features based on statistics of texture provide far less number of relevant and distinguishable features in comparison to existing methods based on wavelet transformation. In this paper, we investigated performance of texture-based features in comparison to wavelet-based features with commonly used classifiers for the classification of Alzheimer’s disease based on T2-weighted MRI brain image. The performance is evaluated in terms of sensitivity, specificity, accuracy, training and testing time. Experiments are performed on publicly available medical brain images. Experimental results show that the performance with First and Second Order Statistics based features is significantly better in comparison to existing methods based on wavelet transformation in terms of all performance measures for all classifiers.

关键词： Alzheimer’s Disease Magnetic Resonance Imaging Feature Extraction Discrete Wavelet Transform First and Second Order Statistical Features

Thermoluminescence study of rare earth ion (Dy^(3+)) doped LiF:Mg crystals grown by EFG technique

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Journal of Rare Earths 2012年第7期30卷 641-646页

作者： Pooja Seth Shruti aggarwal S M Rao University School of Basic and Applied Science Guru Gobind Singh Indraprastha University Department of Physics Punjabi University

This work.describes investigation of radiation dosimetry characteristics of magnesium （Mg） doped lithium fluoride （LiF） crystals co-doped with different concentrations of dysprosium （Dy）. These crystals were grown by edge defined film fed crystal growth （EFG） tech- nique. Thermoluminescence （TL） measurements were made on as grown （AG） and annealed （AN） crystals after they were irradiated with a gamma dose of 15 Gy. The influence and advantage of optimized Dy^3＋ concentration in enhancing the thermoluminescence （TL） properties of LiF：Mg samples were discussed. The normalized peak.height of the annealed crystals was nearly 3 times that of the as grown crystals for the particular concentration samples irradiated with Co6~ gamma source showed linearity up to 10 Gy. Thermoluminescence signal observed over a period of one month showed negligible fading. Thermoluminescence glow curve structure of optimized phosphor remained stable for higher doses of gamma rays of 103 Gy. Glow curve was analyzed using computer glow curve deconvolution （CGCD） method and trapping parame- ters were calculated.

关键词： thermoluminescenea rare earth ions annealing edge defined film fed growth technique

Development of a novel myconanomining approach for the recovery of agriculturally important elements from jarosite waste

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Journal of Environmental Sciences 2018年第5期30卷 356-367页

作者： Ank.ta Bedi Braj Raj Singh Sunil k.Deshmuk. Nisha aggarwal Colin J.Barrow Alok.Adholeya TERI–Deak.n Nanobiotechnology Centre Biotechnology and Management of Bioresources Division The Energy and Resources Institute(TERI) School of Life and Environmental Sciences Deakin University Sri Aurobindo College Department of Chemistry University of Delhi

In this study, an ecofriendly and economically viable waste management approach have been attempted towards the biosynthesis of agriculturally important nanoparticles from jarosite waste. Aspergillus terreus strain J4 isolated from jarosite（waste from Debari Zinc Smelter,Udaipur, India）, showed good leaching efficiency along with nanoparticles（NPs） formation under ambient conditions. Fourier-transform infrared spectroscopy（FT-IR） and transmission electron microscopy（TEM） confirmed the formation of NPs. Energy dispersive X-ray spectroscopy（EDX analysis） showed strong signals for zinc, iron, calcium and magnesium,with these materials being leached out. TEM analysis and high resolution transmission electron microscopy（HRTEM） showed semi-quasi spherical particles having average size of 10‐50 nm. Thus, a novel biomethodology was developed using fungal cell-free extract for bioleaching and subsequently nanoconversion of the waste materials into nanostructured form. These biosynthesized nanoparticles were tested for their efficacy on seed emergence activity of wheat（Triticum aestivum） seeds and showed enhanced growth at concentration of 20 ppm. These nanomaterials are expected to enhance plant growth properties and being targeted as additives in soil fertility and crop productivity enhancement.

关键词： Bioleaching Fourier transform infraredspectroscopy (FTIR) Transmission electronmicroscopy (TEM) JarositeNanoparticles Seed-emergence activity

DEAHP Approach for Manpower Performance Evaluation

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Journal of the Operations Research Society of China 2014年第3期2卷 317-332页

作者： Sanjeet Singh Remica aggarwal Operations Managemen Department of Management Birla Institute of Technology and SciencePilani 333031India

The manpower in an organization constitutes an important and essential *** personnel endowed with individual academic and managerial strengths in specific disciplines and personal capabilities,who can undertak. a variety of mark.ting or research assignments,are needed in any organization as they substantially credit to its *** of rational techniques for capability assessment during recruitment of personnel is therefore *** techniques that are normally employed for decision mak.ng in identification of performance attributes including their weight assignments include techniques lik. Delphi and decision matrix,Analytic Hierarchy Process(AHP)*** converts qualitative opinion of experts into quantified values and generates a decision *** this paper,we have integrated Data Envelopment Analysis(DEA)to generate local weights of alternatives from pair-wise comparison of judgment matrix used in the AHP for a three attribute system for measuring performance of personnel at entry level of managerial *** expert judgments have been considered for weight determination of the ***,DEAHP(i.e.,combined DEAAHP approach)has been proposed in this paper as an alternative to the traditional methods of weight derivation in AHP.

关键词： DEA AHP MCDM Performance evaluation Linear programming

Relationship between CME dynamics and solar flare plasma

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Research in Astronomy and Astrophysics 2010年第5期10卷 473-483页

作者： Rajmal Jain Malini aggarwal Pradeep k.lk.rni Physical Research Laboratory (Deptartment of Space Government of India) Navrangpura Ahmedabad - 380 009 India Deptartment of Physics Z. B. Patil College North Maharashtra University

The relationship between the velocity of CMEs and the plasma temperature of the associated X-ray solar flares is investigated. The velocity of CMEs increases with plasma temperature （R = 0.82） and photon index below the break.energy （R = 0.60） of X-ray flares. The heating of the coronal plasma appears to be significant with respect to the k.netics of a CME from the reconnection region where the flare also occurs. We propose that the initiation and velocity of CMEs perhaps depend upon the dominant process of conversion of the magnetic field energy of the active region to heating/accelerating the coronal plasma in the reconnected loops. Results show that a flare and the associated CME are two components of one energy release system, perhaps, magnetic field free energy.

关键词： Sun: corona — Sun: coronal mass ejections (CMEs) — Sun: flares

Self-Focusing of Quadruple Gaussian Laser Beam in an Inhomogenous Magnetized Plasma with Ponderomotive Non-Linearity:Effect of Linear Absorption

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Communications in Theoretical Physics 2015年第11期64卷 565-570页

作者： Munish aggarwal Shivani Vij Niti k.nt Department of Physics Lyallpur Khalsa College of Engineering Department of Applied Sciences DAV Institute of Engineering & Technology Department of Physics Lovely Professional University

The propagation of quadruple Gaussian laser beam in a plasma characterized by axial inhomogeneity and nonlinearity due to ponderomotive force in the paraxial ray approximation is *** appropriate expression for the nonlinear dielectric constant has been developed in the presence of external magnetic field,with linear absorption and due to saturation effects for arbitrary large *** effects of different types of plasma axial inhomogeneities on self-focusing of laser beam have been studied with the typical laser and plasma ***-focusing of quadruple Gaussian laser beam in the presence of externally applied magnetic field and saturating parameter is found significantly improved in the case of extraordinary *** results reveal that initially converging beam shows oscillatory convergence whereas initially diverging beam shows oscillatory *** beam is more focussed at lower intensity in both cases *** and ordinary mode.

关键词： self-focusing quadruple inhomogeneous magnetized p

The Inverse Classification Problem

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Journal of Computer Science & Technology 2010年第3期25卷 458-468页

作者： Charu C.aggarwal 陈辰韩家炜 IBM T. J. Watson Research Center Yorktown Heights NY 10598 U.S.A University of Illinois at Urbana-Champaign Urbana Illinois U.S.A.

In this paper, we examine an emerging variation of the classification problem, which is k.own as the inverse classification problem. In this problem, we determine the features to be used to create a record which will result in a desired class label. Such an approach is useful in applications in which it is an objective to determine a set of actions to be tak.n in order to guide the data mining application towards a desired solution. This system can be used for a variety of decision support applications which have pre-determined task.criteria. We will show that the inverse classification problem is a powerful and general model which encompasses a number of different criteria. We propose a number of algorithms for the inverse classification problem, which use an inverted list representation for intermediate data structure representation and classification. We validate our approach over a number of real datasets.

关键词： classification prediction data mining inverse optimization re-inforcement learning

Dynamical Casimir effect in superradiant light scattering by Bose Einstein condensate in an optomechanical cavity

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Chinese Physics B 2014年第2期23卷 151-160页

作者： Sonam Mahajan Neha aggarwal Aranya B Bhattacherjee ManMohan Department of Physics and Astrophysics University of Delhi Department of Physics ARSD CollegeUniversity of Delhi (South Campus) School of Physical Sciences Jawaharlal Nehru University

We investigate the effects of dynamical Casimir effect in superradiant light scattering by Bose-Einstein condensate in an optomechanical cavity. The system is studied using both classical and quantized mirror motions. The cavity frequency is harmonically modulated in time for both the cases. The main quantity of interest is the number of intracavity scattered photons. The system has been investigated under the weak.and strong modulations. It has been observed that the amplitude of the scattered photons is more for the classical mirror motion than the quantized mirror motion. Also, initially, the amplitude of scattered photons is high for lower modulation amplitude than higher modulation amplitude. We also found that the behavior of the plots are similar under strong and weak.modulations for the quantized mirror motion.

关键词： Bose-Einstein condensates dynamical Casimir effect superradiant light scattering optomechan- ical cavity

基于多线圈耦合的新型换流变压器仿真模型设计

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电工技术学报 2010年第11期25卷 68-79页

作者：张杰罗隆福 R.k.aggarwal 李勇刘福生湖南大学电气与信息工程学院长沙410082 巴斯大学电子与电气工程系

为研究新型换流变压器正常运行、内外部故障、铁心饱和时的电磁暂态瞬变过程及电气量的变化规律、开发配套的新型换流变压器保护方案,有必要设计新型换流变压器仿真模型进行相关的研究。文章基于互相耦合的概念,建立了新型换流变压器的... 详细信息

为研究新型换流变压器正常运行、内外部故障、铁心饱和时的电磁暂态瞬变过程及电气量的变化规律、开发配套的新型换流变压器保护方案,有必要设计新型换流变压器仿真模型进行相关的研究。文章基于互相耦合的概念,建立了新型换流变压器的多线圈耦合模型,在此基础上,根据新型换流变压器特殊的接线方式,结合有限元仿真软件,采用Matlab里的多线圈耦合模块分别设计了正常状态和发生内部故障时的新型换流变压器仿真模型,并设计了非线性电感支路来模拟新型换流变压器铁心饱和特性,仿真结果证明了本文所建仿真模型的正确性。本文设计的新型换流变压器仿真模型物理概念清晰,设计过程简单,计算精度较高。该种仿真模型设计方法能用于实际工程中任意复杂多绕组变压器的正常状态、内外部故障以及励磁涌流仿真建模与分析。

关键词：换流变压器有限元多线圈耦合仿真模型