检索结果-南通市图书馆

Adaptive Particle swarm Optimization Data Hiding for High security secret Image sharing

Computer systems science & Engineering 2022年第12期43卷 931-946页

作者： s.Lakshmi narayanan Electronics and Communication Engineering Sri Ramakrishna Engineering CollegeCoimbatore641022Tamil NaduIndia

The main aim of this work is to improve the security of data hiding forsecret image sharing. The privacy and security of digital information have becomea primary concern nowadays due to the enormous usage of digital *** security and the privacy of users’ images are ensured through reversible datahiding techniques. The efficiency of the existing data hiding techniques did notprovide optimum performance with multiple end nodes. These issues are solvedby using separable Data Hiding and Adaptive Particle swarm Optimization(sDHAPsO) algorithm to attain optimal performance. Image encryption, dataembedding, data extraction/image recovery are the main phases of the proposedapproach. DFT is generally used to extract the transform coefficient matrix fromthe original image. DFT coefficients are in float format, which assists in transforming the image to integral format using the round function. After obtainingthe encrypted image by data-hider, additional data embedding is formulated intohigh-frequency coefficients. The proposed sDHAPsO is mainly utilized for performance improvement through optimal pixel location selection within the imagefor secret bits concealment. In addition, the secret data embedding capacityenhancement is focused on image visual quality maintenance. Hence, it isobserved from the simulation results that the proposed sDHAPsO techniqueoffers high-level security outcomes with respect to higher PsNR, security level,lesser MsE and higher correlation than existing techniques. Hence, enhancedsensitive information protection is attained, which improves the overall systemperformance.

关键词： Image sharing separable data hiding using adaptive particle swarm optimization(sDHAPsO) security access control

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Life threatening vitamin B_(12) deficiency:will timely screening make a difference?

引用

World Journal of Gastroenterology 2000年第3期6卷 456-457页

作者： T.s.Dharmarajan s. Lakshmi narayanan Rajiv D. Poduval Chief Division of GeriatricsDirectorGeriatric Medicine Fellowship Program Our Lady of Mercy University Medical Center600 E 233~(rd)StreetBronxNY 10466 Resident Internal Medicine Our Lady of Mercy Medical Center Chief Medical Resident Internal Medicine Our Lady of Mercy Medical Center

INTRODUCTION While Vit.B12 deficiency is common,with aprevalence of about 15% in the elderly,andrecommendations for treatment available,detectionof deficiency at the pre-clinical stage by appropriatescreening does not always take *** report isan example of life threatening Vit.B12 deficiencydiagnosed at age 56,with the onset of Vit.B12depletion likely to have begun in the

关键词： vitamin B12 deficiency/therapy anemia sickle cell gastric mucosa biopsy anemia pernicious toxicity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Hot Corrosion Behavior of Friction Welded AIsI 4140 and AIsI 304 in K_2sO-60% NaCl Mixture

引用

Journal of Materials science & Technology 2012年第10期28卷 895-904页

作者： N.Arivazhagan K.senthilkumaran s.narayanan K.Devendranath Ramkumar s.surendra s.Prakash school of Mechanical and Building sciences VIT University Department of Metallurgical and Materials Engineering Indian Institute of Technology Roorkee

Understanding the behavior of weldment at elevated temperatures and especially the corrosion behavior has become an object of scientific investigation recently. Investigation has been carried out on friction welded AIsI 4140 and AIsI 304 in molten salt of K2sO4-60% NaCI environment at 550, 600 and 650 ℃ under cyclic condition. The resulted oxide scales in the weldment have been characterized systematically by surface analytical techniques. From the results of the experiments~ it is observed that the scale thickness on low alloy steel side was higher than that on stainless steel side. Furthermore, weld interface has been found to be more susceptible to degradation than base metals due to inter diffusion of element across the interface and the formation of intermetallic compound. The influences of welding parameters and the temperature of exposure on the hot corrosion behavior of the weldment were discussed in this paper.

关键词： Friction Welding Dissimilar metals Hot corrosion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nanobiocomposite Electrochemical Biosensor Utilizing synergic Action of Neutral Red Functionalized Carbon Nanotubes

引用

Nano-Micro Letters 2012年第4期4卷 220-227页

作者： D.R.shobha Jeykumari R.Kalaivani s.sriman narayanan Department of Chemistry Women’s Christian college Department of Chemistry School of Basic Sciences VELS University Department of Analytical Chemistry School of Chemical Sciences University of Madras Guindy Campus National Centre for Nanoscience and Nanotechnology University of Madras Guindy campus

An amperometric hydrogen peroxide biosensor using a nanobiocomposite based on neutral red modified carbon nanotubes and co-immobilized glucose oxidase and horseradish peroxidase is reported. Modification of the nanobiocomposite electrode with neutral red resulted in a sensitive, low-cost and reliable H_2O_2 sensor. The use of carbon nanotubes, as the conductive part of the composite, facilitated fast electron transfer rates. The biosensor was characterized for the influence of p H, potential and temperature. A remarkable feature of the biosensor is the detection of H_2O_2 at low applied potentials where the noise level and interferences are minimal. The sensor has a fast steady-state measuring time of 10 s with a quick response(2 s). The biosensor showed a linear range from 15 n M to 45 m M of H_2O_2 and a detection limit of 5 n M. Nafion, which is used as a binder, makes the determination free from other electroactive substances. The repeatability, reproducibility,stability and analytical performance of the sensor are very good.

关键词： Multiwalled carbon nanotubes Neutral red Glucose oxidase Horseradish peroxidase Nafion Nanobiocomposite biosensor

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pure and Mg-doped self-assembled ZnO nano-particles for the enhanced photocatalytic degradation of 4-chlorophenol

引用

Journal of Environmental sciences 2013年第10期25卷 2157-2167页

作者： N.Clament sagaya selvam s.narayanan L.John Kennedy J.Judith Vijaya Catalysis and Nanomaterials Research Laboratory Department of Chemistry Loyola College Materials Division School of Advanced Sciences Vellore Institute of Technology UniversityChennai Campus

A novel self-assembled pure and Mg doped ZnO nano-particles （NPs） were successfully synthesized by a simple low temperature co-precipitation method. The prepared photocatalysts were characterized by X-ray diffraction, high resolution scanning electron mi- croscopy, high resolution transmission electron microscopy, diffuse reflectance spectroscopy and photoluminescence （PL） spectroscopy. The results indicated that the prepared photocatalysts showed high crystallinity with a uniform size distribution of the NPs. The degradation of cholorphenols is highly mandatory in today＇s scenario as they are affecting the environment adversely. Thus, the photocatalytic degradation of 4-chlorophenol （4-CP）, a potent endocrine disrupting chemical in aqueous medium was investigated by both pure and Mg-doped ZnO NPs under UV-light irradiation in the present study. The influence of the Mg content on the structure, morphology, PL character and photocatalytic activity of ZnO NPs were investigated systematically. Furthermore,the effect of different parameters such as 4-CP concentration, photocatalyst amount, pH and UV-light wavelength on the resulting photocatalytic activity was investigated.

关键词： Mg-doped ZnO nanoparticles photocatalyst photocatalytic degradation 4-chlorophenol

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design of internal model control based fractional order PID controller

引用

控制理论与应用（英文版） 2012年第3期10卷 297-302页

作者： T.VINOPRABA N.sIVAKUMARAN s.narayanan T.K.RADHAKRIsHNAN Department of Instrumentation and Control Engineering National Institute of TechnologyTiruchirappalli 620015India Department of Chemical Engineering National Institute of TechnologyTiruchirappalli 620015India

This article presents a design of the internal model control （IMC） based single degree of freedom （sDF） fractional order （FO） PID controller with a desired bandwidth specification for a class of fractional order system （FOs）. The drawbacks of the sDF FO-IMC are eliminated with the help of the two-degree of freedom （TDF） FO PID controller. The robust stability and robust performance of the designed controller are analyzed using an example.

关键词： Fractional order PID controller Fractional order systems Model based control Robust control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

New therapeutic strategies targeting D1-type dopamine receptors for neuropsychiatric disease

引用

Frontiers in Biology 2015年第3期10卷 230-238页

作者： Young-Cho Kim stephanie L. Alberico Eric Emmons Nandakumar s. narayanan Department of Neurology University of Iowa Iowa City IA 52242 USA Aging Mind and Brain Initiative Carver College of Medicine University of Iowa Iowa City IA 52242 USA

The neurotransmitter dopamine acts via two major classes of receptors, Dl-type and D2-type. D1 receptors are highly expressed in the striatum and can also be found in the cerebral cortex. Here we review the role of D1 dopamine signaling in two major domains： L-DOPA-induced dyskinesias in Parkinson＇s disease and cognition in neuropsychiatric disorders. While there are many drugs targeting D2-type receptors, there are no drugs that specifically target D1 receptors. It has been difficult to use selective Dl-receptor agonists for clinical applications due to issues with bioavailability, binding affinity, pharmacological kinetics, and side effects. We propose potential therapies that selectively modulate D1 dopamine signaling by targeting second messengers downstream of D1 receptors, aUosteric modulators, or by making targeted modifications to Dl-receptor machinery. The development of therapies specific to Dl-receptor signaling could be a new frontier in the treatment of neurological and psychiatric disorders.

关键词： D1DR dopamine D1 receptor dyskinesia cognition

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Triton X-100辅助合成多级孔道结构ZsM-5沸石催化剂(英文)

引用

催化学报 2014年第11期35卷 1892-1899页

作者： s.narayanan J.Judith Vijaya s.sivasanker sihai Yang L.John Kennedy Catalysis & Nanomaterials Research Laboratory Department of Chemistry Loyola College (Autonomous) National Centre for Catalysis Research Indian Institute of Technology school of Chemistry University of Nottingham University Park Materials Division School of Advanced Sciences Vellore Institute of Technology (VIT) University

ZsM-5 zeolite with a hexagonal cubic morphology was synthesized by a hydrothermal method using Triton X-100, a nonionic surfactant. The samples prepared with and without the surfactant were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy, N2 adsorption, high resolution transmission electron microscopy(TEM), high resolution scanning electron mi-croscopy, energy dispersive X-ray analysis, and NH3 temperature-programmed desorption. The XRD patterns confirmed the formation of a pure ZsM-5 crystalline phase without secondary phases. TEM images revealed that the hexagonal cubes were made of peanut-shaped nanoparticles with *** catalytic activity of the zeolite samples was evaluated using the selective oxidation of benzyl alcohol with tertiary-butyl hydrogen peroxide as the oxidant at 90 °C. The surfactant-assisted prep-aration yielded a zeolite that gave a higher conversion than the one prepared in the absence of the surfactant. The catalyst was retrieved and reused four times without significant loss in activity and selectivity.

关键词： ZsM-5催化剂 Triton 水热法合成 X-100 非离子表面活性剂 ZsM-5沸石高分辨透射电子显微镜傅立叶变换红外光谱

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

GA Based Heuristic to Minimize Makespan in single Machine scheduling Problem with Uniform Parallel Machines

引用

Intelligent Information Management 2011年第5期3卷 204-214页

作者： P. senthilkumar s. narayanan 不详

This paper considers the single machine scheduling problem with uniform parallel machines in which the objective is to minimize the makespan. Four different GA based heuristics are designed by taking different combinations of crossover methods, viz. single point crossover method and two point crossover method, and job allocation methods while generating initial population, viz. equal number of jobs allocation to machines and proportionate number of jobs allocation to machines based on machine speeds. A detailed experiment has been conducted by assuming three factors, viz. Problem size, crossover method and job allocation method on 135 problem sizes each with two replications generated randomly. Finally, it is suggested to use the GA based heuristic with single point crossover method, in which the proportionate number of jobs allocated to machines based on machine speeds.

关键词： Uniform Parallel Machines Genetic Algorithm Crossover Method Job Allocation Method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

经Opuntia dilenii haw植物提取液绿色合成制备的纳米铝酸锌的催化性质(英文)

引用

催化学报 2013年第10期34卷 1951-1958页

作者： C.Ragupathi J.Judith Vijaya s.narayanan L.John Kennedy seeram Ramakrishna Catalysis and Nanomaterials Research Laboratory Department of ChemistryLoyola College Materials Division School of Advanced SciencesVellore Institute of Technology University Centre for Nanofibres and Nanotechnology National University of Singapore

Various nanosized zinc aluminate(ZnAl2O4) samples were prepared by a conventional and a mi- crowave method both with and without using Opuntia dilenii haw plant extract,and were charac- terized by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),high resolution scanning electron microscopy(HRsEM),energy dispersion scanning(EDX),temperature dependent conductance measurements, thermoelectric power measurements, ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopy,and photoluminescence *** formation of a pure ZnAl2O4 phase was confirmed by XRD and FT-IR.A change in morphology from nanosized plates to nanosized sheets with,respectively,the conventional and microwave heating methods was clearly shown by ***-Vis diffusion reflectance spectroscopy measured the band gaps of ZnAl2O4 nanosized plates and nanosized sheets as 3.5 and 3.9 eV,*** synthesized ZnAl2O4 was single crystalline and has three photoluminescence emissions at 482,528,and 540 ***2O4 nanosized sheets prepared by the microwave method showed higher catalytic activity for the oxida- tion of benzyl alcohol(85% conversion) than ZnAl2O4 nanosized plates prepared by the convention- al method(60% conversion).

关键词： Green synthesis Zinc aluminate spinel Microwave Optical property

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：