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Artificial neural network approach for analyzing mutual coupling in a rectangular MIMO antenna

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Frontiers of Electrical and Electronic Engineering in China 2012年第3期7卷 293-298页

作者： K. SRI RAMA KRISHNA K. j.GADEESH BABU j. l.kshmi narayana l. PRATAP REDDY G. V. SUBRAHMANYAM Department of Electronics and Communication Engineering VRSiddhartha Engineering College Vijayawada India K. j.GADEESH BABU J. LAKSHMI NARAYANADepartment of Electronics and Communication Engineering St. Ann'sCollege of Engineering and Technology Chirala India Department of Electronics and Communication Engineering JNTUCollege of Engineering Hyderabad India Department of Electronics and Communication Engineering AcharyaNagarjuna University Guntur India

A wideband rectangular patch antenna resonat- ing at 3.5 GHz and 8 GHz frequencies is developed on a flexible substrate, which can be used for wearable applications. The proposed antenna gives a wide impe- dance bandwidth of 116%, operating from *** to 9.5 GHz, covering most of the ultra-wideband （UWB） operating frequency range. A two-element multiple-input multiple-output （MIMO） system is developed using the proposed antenna, and the mutual coupling between the two antennas for various separations and frequencies is analyzed by using artificial neural networks （ANNs）. The neural structure is trained by using different ANN algorithms and a comparative study is made between them. It is shown that, quasi-Newton （QN） and quasi- Newton multi layer perceptron （QN-MlP） algorithms are better in terms of training, testing errors, and correlation coefficient.

关键词： flexible substrate multiple input multipleoutput (MIMO) systems artificial neural networks (ANNs) mutual coupling impedance bandwidth

Optimization of Diffraction Efficiency and Polarization Dependence loss in Photopolymer Grating for Use in Multichip Module

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j.urnal of Modern Physics 2012年第9期3卷 1009-1012页

作者： lingaraj.Sahu j. Surya narayana Achary Sukanta Kumar Tripathy Ganj.m College Berhampur Odisa India National Institute of Science and Technology Berhampur Odisa India Sanj.ya Memorial Institute of Tehonology Berhampur Odisa India

We in this paper propose a model to increase the diffraction efficiency of a holographic grating at 1550 nm for multiplexing application. To use such a grating, polarization dependence loss is introduced analytically and then optimized for its minimum value A configuration of holographic grating is proposed based on both maximum diffraction efficiency and minimum polarization dependence loss. The proposed grating is expected to find importance in optoelectronic multichip module.

关键词： Multiplexing Demultiplexing Modulation Index

Phenotypic, Stress Tolerance and Plant Growth Promoting Characteristics of Rhizobial Isolates from Selected Wild legumes of Semiarid Region, Tirupati, India

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Advances in Microbiology 2016年第1期6卷 1-12页

作者： Y. Bhargava j. S. R. Murthy T. V. Raj.sh Kumar M. narayana Rao Department of Biotechnology S. V. University Tirupati India Department of Botany S. V. University Tirupati India

Rhizobia are vital for nitrogen input, fertility of soil and legume plant growth. Knowledge on rhizobial diversity from arid and semiarid areas is important for dry land agriculture in the context of climatic change and for economic utilization. This study provides morphological, biochemical, stress tolerance and plant growth promoting characteristics of fifteen rhizobial isolates from the nodules of same number of wild legumes and one isolate from cultivated Arachis hypogea from semi-arid region, Tirupati. The bacterial isolates were confirmed as rhizobia based on colony morphology and biochemical tests. Based on the colour change of YMA-BTB medium, eight isolates were identified as slow growers and six were fast growers. The isolates differed in growth pattern, colony morphology, antibiotic resistance at higher concentrations and uniformity in utilization of carbon and nitrogen sources. The isolates are tolerant to NaCl up to one percent, displayed normal growth at temperatures 28℃ - 30℃, at neutral pH and poor growth at pH 5and 9. The isolates varied in the production of EPS and IAA, positive for phosphate solubilization and siderophore formation. This functional diversity displayed by the isolates can be utilised for the legume crop production by cross inoculation.

关键词： Wild legumes Rhizobia Characterization Stress Tolerance Plant Growth Promotion

Incidence, timing, and treatment of new brain metastases after Gamma Knife surgery for limited brain disease： the case for reducing the use of whole-brain radiation therapy

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中国神经肿瘤杂志 2011年第1期9卷 76-76页

作者： Rush S Elliott RE Morsi A Mehta N Spriet j.narayana A Donahue B Parker EC Golfions j.

Obj.ct In this paper, the authors" goal was to analyze the incidence, timing, and treatment of new metastases following initial treatment with 20-Gy Gamma Knife surgery (GKS) alone in patients with limited brain metas... 详细信息

关键词：脑血管疾病放射治疗手术治疗发病率时间 GKS 伽玛刀

平扫MRI深度学习预测多发性硬化的强化病灶

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国际医学放射学杂志 2020年第2期 240-240页

作者： P.A.narayana I.Coronado S.j.Suj.t j.S.Wolinsky F.D.lublin R.E.Gabr 李璐 Department of Diagnostic and Interventional Imaging Mc Govern Medical School University of Texas Health Science Center

增强MRI扫描出现病灶的强化通常被认为是多发性硬化症(MS)活动的表现,而研究不用对比剂就能预测出强化病灶的方法是很有必要的。目的探讨深度学习能否

关键词： MRI 多发性硬化深度学习