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Review of Fresnel incoherent correlation holography with linear and non-linear correlations

Chinese Optics Letters 2021年第2期19卷 1-6页

作者： vijayakumar Anand Tomas katkus Soon Hock Ng Saulius Juodkazis Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthornVIC 3122Australia Melbourne Centre for Nanofabrication ANFFClaytonVIC 3168Australia Tokyo Tech World Research Hub Initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

Fresnel incoherent correlation holography(FINCH)is a well-established incoherent imaging *** FINCH,three selfinterference holograms are recorded with calculated phase differences between the two interfering,differently modulated object waves and projected into a complex *** object is reconstructed without the twin image and bias terms by a numerical Fresnel back propagation of the complex hologram.A modified approach to implement FINCH by a single camera shot by pre-calibrating the system involving recording of the point spread function library and reconstruction by a nonlinear cross correlation has been introduced *** expression of the imaging characteristics from the modulation functions in original FINCH and the modified approach by pre-calibration in spatial and polarization multiplexing schemes are *** study reveals that a reconstructing function completely independent of the function of the phase mask is required for the faithful expression of the characteristics of the modulating function in image *** the polarization multiplexing method by non-linear cross correlation,a partial expression was observed,while in the spatial multiplexing method by non-linear cross correlation,the imaging characteristics converged towards a uniform behavior.

关键词： digital holographic imaging Fresnel incoherent correlation holography holographic techniques imaging systems incoherent holography and speckle noise

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Fresnel incoherent correlation holography with single camera shot

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Opto-Electronic Advances 2020年第8期3卷 12-22页

作者： Anand vijayakumar Tomas katkus Stefan Lundgaard Denver P.Linklater Elena P.Ivanova Soon Hock Ng Saulius Juodkazis Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials(SEAM) School of ScienceSwinburne University of TechnologyHawthorn 3122Australia Department of Physics Royal Melbourne Institute of TechnologyGPO Box 2476Melbourne 3001Australia Melbourne Centre for Nanofabrication Australian National Fabrication Facility151 Wellington RoadClaytonVIC 3168Australia Tokyo Tech World Research Hub Initiative(WRHI) School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

Fresnel incoherent correlation holography(FINCH)is a self-interference based super-resolution three-dimensional imaging *** in inline configuration requires an active phase modulator to record at least three phase-shifted camera shots to reconstruct objects without twin image and bias *** this study,FINCH is realized using a randomly multiplexed bifocal binary diffractive Fresnel zone lenses fabricated using electron beam *** object space is calibrated by axially scanning a point object along the optical axis and recording the corresponding point spread holograms(PSHs).An object is mounted within the calibrated object space,and the object hologram was recorded under identical experimental conditions used for recording the *** image of the object at different depths was reconstructed by a cross-correlation between the object hologram and the *** potential including bio-medical optics is discussed.

关键词： imaging holography correlation three-dimensional imaging diffractive optics

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A two-scale approach for estimating forest aboveground biomass with optical remote sensing images in a subtropical forest of Nepal

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Journal of Forestry Research 2019年第6期30卷 2119-2136页

作者： Upama A.koju Jiahua Zhang Shashish Maharjan Sha Zhang Yun Bai Dinesh B.I.P.vijayakumar Fengmei Yao key Laboratory of Digital Earth Sciences Institute of Remote Sensing and Digital EarthCASBeijing 100094People’s Republic of China University of Chinese Academy of Sciences Beijing 100094People’s Republic of China International Maize and Wheat Improvement Center Kathmandu 44600Nepal The Laboratory of Forest Inventory The National Institute of Geographic and Forest InformationNancyFrance

Forests account for 80%of the total carbon exchange between the atmosphere and terrestrial ***,to better manage our responses to global warming,it is important to monitor and assess forest aboveground carbon and forest aboveground biomass(FAGB).Different levels of detail are needed to estimate FAGB at local,regional and national ***-scale remote sensing analysis from high,medium and coarse spatial resolution data,along with field sampling,is one approach often ***,the methods developed are still time consuming,expensive,and inconvenient for systematic monitoring,especially for developing countries,as they require vast numbers of field samples for ***,we recommend a convenient two-scale approach to estimate FAGB that was tested in our study *** study was conducted in the Chitwan district of Nepal using GeoEye-1(0.5 m),Landsat(30 m)and Google Earth very high resolution(GEVHR)Quickbird(0.65 m)*** the local scale(kayerkhola watershed),tree crowns of the area were delineated by the object-based image analysis technique on GeoEye *** overall accuracy of 83%was obtained in the delineation of tree canopy cover(TCC)per plot.A TCC *** model was developed based on the TCC estimations from GeoEye and FAGB measurements from field sample plots.A coefficient of determination(R2)of 0.76 was obtained in the modelling,and a value of 0.83 was obtained in the validation of the *** upscale FAGB to the entire district,open source GEVHR images were used as virtual field *** delineated their TCC values and then calculated FAGB based on a TCC versus FAGB *** the multivariate adaptive regression splines machine learning algorithm,we developed a model from the relationship between the FAGB of GEVHR virtual plots with predictor parameters from Landsat 8 bands and vegetation *** model was then used to extrapolate FAGB to the entire *** approach considerably reduced the need for field data and com

关键词： Forest aboveground biomass Google Earth imagery Multi-scale remote sensing Virtual plot Optical imagery

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An Effective Network Traffic Data Control Using Improved Apriori Rule Mining

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Circuits and Systems 2016年第10期7卷 3162-3173页

作者： Subbiyan Prakash Murugasamy vijayakumar Department of Information Technology Sri Shakthi Institute of Engineering and Technology Coimbatore India Department of Computer Science and Engineering Nandha College of Technology Erode India

The increasing usage of internet requires a significant system for effective communication. To pro- vide an effective communication for the internet users, based on nature of their queries, shortest routing path is usually preferred for data forwarding. But when more number of data chooses the same path, in that case, bottleneck occurs in the traffic this leads to data loss or provides irrelevant data to the users. In this paper, a Rule Based System using Improved Apriori (RBS-IA) rule mining framework is proposed for effective monitoring of traffic occurrence over the network and control the network traffic. RBS-IA framework integrates both the traffic control and decision making system to enhance the usage of internet trendier. At first, the network traffic data are ana- lyzed and the incoming and outgoing data information is processed using apriori rule mining algorithm. After generating the set of rules, the network traffic condition is analyzed. Based on the traffic conditions, the decision rule framework is introduced which derives and assigns the set of suitable rules to the appropriate states of the network. The decision rule framework improves the effectiveness of network traffic control by updating the traffic condition states for identifying the relevant route path for packet data transmission. Experimental evaluation is conducted by extrac- ting the Dodgers loop sensor data set from UCI repository to detect the effectiveness of theproposed Rule Based System using Improved Apriori (RBS-IA) rule mining framework. Performance evaluation shows that the proposed RBS-IA rule mining framework provides significant improvement in managing the network traffic control scheme. RBS-IA rule mining framework is evaluated over the factors such as accuracy of the decision being obtained, interestingness measure and execution time.

关键词： Network Traffic Internet Traffic Condition Rule Mining Decision Rule Framework Interestingness Traffic Data Web Log

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Biosynthesis of silver nanoparticles by using mangrove plant extract and their potential mosquito larvicidal property

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Asian Pacific Journal of Tropical Medicine 2011年第10期4卷 799-803页

作者： M Gnanadesigan M Anand S Ravikumar M Maruthupandy V vijayakumar S Selvam M Dhineshkumar Ak kumaraguru School of Energy Environmental and Natural ResourcesDepartment of Marine and Coastal StudiesMadurai Kamaraj UniversityMadurai-625021Tamil NaduIndia School of Marine Sciences Department of Oceanography and Coastal Area StudiesAlagappa UniversityThondi CampusThondi-623409Ramanathapuram DistrictTamil NaduIndia School of Chemistry Department of Inorganic ChemistryMadurai Kamaraj UniversityMadurai-625021Tamil NaduIndia School of Chemistry Department of Industrial ChemistryAlagappa UniversityKaraikudi-630003Tamil NaduIndia

Objective:To identify the larvicidal activities of silver nano particles synthesised with Rhizophora mucronata（***） leaf extract against the larvae of Aedes aegypti（***） and Culex quinquefasciatus（***）.Methods:In vitro larvicidal activities such as LC50 and LC90 were assessed for the *** and *** larval ***, characterisation such as UV,XRD,FTIR and AFM analysis were carried out for the synthesised silver nano ***:The LC50 value of the synthesised silver nano particle was identified as 0.585 and 0.891 mgg/L for *** and *** larvae respectively. Further,the LG90 values are also identified as 2.615 and 6.291 mg/L for *** and Cx. quinquefasciatus species *** synthesised silver nanoparticles have maximum absorption at 420 nm with the average size of 60-95 *** XRD data showed 20 intense values with various degrees such as 37.10°,47.66°,63.97°and 70.01°.The FTIR data showed prominent peaks in（3 426.89,2 925.49,2 869.56,2 346.95,1 631.49,1 031.73,669.18 and 455.12） different ***:The biosynthesis of silver nanoparticles with leaf aqueous extract of R. mucronata provides potential source for the larvicidal activity against mosquito borne diseases.

关键词： Biosynthesis Mangroves Larvicidal

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A potent fish pathogenic bacterial killer Streptomyces *** from the soils of east coast region,South India

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Journal of Coastal Life Medicine 2013年第3期 175-180页

作者： Durairaj Thirumurugan Ramasamy vijayakumar Department of Microbiology Bharathidasan University Constituent College kurumbalur-621107 PerambalurTamilnaduIndia

Objective:To investigate the potentiality of the marine actinobacteria isolated from marine soil against fish pathogenic ***:east coast region(ECR)of Tamilnadu,South *** they were used for the isolation of actinobacteria by using conventional serial dilution technique on starch casein agar *** antibacterial activities of the actinobacteria were screened primarily by using cross streak plate method against fish pathogenic bacteria namely Vibrio alginolyticus,Vibrio parahaemolyticus,Vibrio cholera,Aeromonas *** Pseudomonas *** antimicrobial efficacy of the selected isolates was carried out with various organic solvents,and finally the active compound was subjected to chromatographic techniques including TLC and ***:In the present study,a total of 33 soil samples were collected from the Bay of Bengal,against fish pathogenic *** of 21 antibacterial isolates,the isolate ECR77 was selected for further study based on its potential activity against fish pathogenic *** the various solvents tested,the ethyl acetate extract had good antibacterial activity against the tested bacterial *** isolate ECR77 grew well on oat meal agar medium with 2%salt level at 35°***-MS study found that the presence of bioactive compounds namely tetradecanoic acid,n-hexadecanoic acid and octadecanoic *** morphological,physiological,biochemical and cultural characteristics of the potential isolate were supported the identity up to generic level asStreptomyces ***:The results obtained from this study concludes that the ECR soils of South India is a hot spot of novel bioactive compound producing marine actinobacteria with great pharmaceutical *** the 82 actinobacteria isolated,21(26%)isolates were possessed antibacterial activity.

关键词： East coast region South India Streptomyces sp.ECR77 Antibacterial activity GC-MS Decanoic acids

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Cyanobacterial metabolites as novel drug candidates in corona viral therapies:A review

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Chronic Diseases and Translational Medicine 2022年第3期8卷 172-183页

作者： Srinivasan Prabhu Subramaniyan vijayakumar Pabakaran Praseetha Department of Botany Annai Vailankanni Arts and Science CollegeThanjavurTamil NaduIndia Deparment of Botany A.V.V.M Sri Pushpam CollegePoondi(Affiliated to Bharathidasan University)ThanjavurTamil NaduIndi Department of Nnotechnology Noorul Islam Cenire for Higher EducationKumaracolTamil NaduIndia

Most of the medical and nonmedical research labs,all around the world,are racing against time to produce an effective vaccine or an antiviral medicine for coronavirus disease 2019(COVID-19).Conventional medicines and novel nano-materials including chemical and herbal-based compounds are all into positive trials toward coronaviruses and other pandemic *** them,natural immune boosters have attracted physicians because of their longevity and reliability for fewer side *** is a review article with a detailed picture of an unexplored antiviral source with maximum potency in curing viral *** have been known for centuries and are rich in secondary metabolites of proteins,biopeptides,and polysaccharides for prominent antiviral action against chest *** detailed exploratory research is required to purify,scale-up,and commercialize the pharmacologically active agents from these drug reserves.

关键词： antiviral drugs coronavirus covid-19 cyanobacteria

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船体风机叶片对中速船水动力性能影响的计算分析

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哈尔滨工程大学学报（英文版） 2023年第4期22卷 762-774页

作者： S.Gopinath R.vijayakumar Department of Ocean Engineering Chennai Indian Institute of Technology MadrasChennai Tamil Nadu 600036India

The importance of reducing ship resistance is growing considerably as a result of the increase in atmospheric emissions and the drive towards green shipping through *** this point,Energy Saving Devices(ESD),in particular,Hull Vane®(HV),have been widely applied as a potential technique for reducing wave-making resistance for vessels with higher Froude Number(Fr).The advantages of HV for a medium-speed vessel,where the wave-making component accounts for almost 50%of total resistance,have yet to be *** study presents the computational analysis of the kCS model(1∶75.5);for a particular trim condition by using the VOF method and RANS *** hull acts as a candidate vessel for the class of medium-speed characteristics.A total of 36 numerical simulations were carried out to study the changes in resistance and motion characteristics of the vessel with and without *** validate the numerical setup,the experimental work of Hou et al(2020)on the DTMB hull was *** effectiveness of HV can be comprehended by the reduction percentage in total resistance,trim,sinkage,and transom wave height,in comparison to bare hull *** reduction in total resistance extends up to 6%for Fr=0.32 with configuration 2 with negative *** CFD results indicate that there is a reduction in trim up to 57%for the maximum speed with a corresponding Fr=0.34 with a positive angle of foil(AoF).The trim correction effect is increasing with the depth of submergence of *** sinkage,there occurs nearly a 31%reduction for Fr=0.34 with a positive *** exists a substantial reduction in the height of the transom wave with the inclusion of HV,the results of which are discussed in *** the presented results,retrofitting the Hull Vane®is effective in the selected speed range but pronouncing as the speed of the vessel increases.

关键词： Decarbonization Green shipping Ship resistance Energy saving devices(ESD) Hull vane®.(HV) Angle of foil(AoF)

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Genetic Algorithm Based Speed Control of PMDC Motor Using Low Cost PIC 16F877A Microcontroller

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Circuits and Systems 2016年第8期7卷 1334-1340页

作者： Thangavel vijayakumar Subramaniam Muthukrishnan Gopalraj Murugananth EEE Department Sri Eshwar College of Engineering Coimbatore India EEE Department Ahalia School of Engineering and Technology Palakkad India

This paper mainly aims at proposing an effective method of speed control of the low power motors like Permanent Magnet Direct Current (PMDC) motor used in the orthopedic surgeries using a natural optimization technique called genetic algorithm. Using this method, better values of Performance parameters like rise time, settling time, fall time, peak overshoot and steady state are achieved compared to the conventional PI controller. The SIMUINk MODEL of both the controller operation is obtained using MATLAB version R2013a. The simulated results reveal that the proposed control drive exhibits reduced peak overshoot, rise time, settling time and steady state error. An experimental setup is devised to validate the simulation results. The comparative analysis made depicts the superiority of the proposed algorithm with reference to its conventional counterpart.

关键词： Effective PMDC Orthopaedic Optimization Performance Indices Rise Time Fall Time Peak Overshoot Steady State Error PI MATLAB

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Salt Stress Induced Modulations in Growth, Compatible Solutes and Antioxidant Enzymes Response in Two Cultivars of Safflower (Carthamus tinctorius L. Cultivar TSF1 and Cultivar SM) Differing in Salt Tolerance

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American Journal of Plant Sciences 2016年第13期7卷 1802-1819页

作者： T. Vijayalakshmi A. S. vijayakumar k. kiranmai A. Nareshkumar Chinta Sudhakar Department of Botany Sri Krishnadevaraya University Anantapur India Department of Crop Physiology GKVK Bangalore India

Safflower is an important, traditional, multipurpose oil crop. This was to investigate the effect of different salinity levels on morphological, physiological, biochemical and antioxidant response of two safflower cultivars (Carthamus tinctorius L. cultivar TSF1 and cultivar SM) differing in salt tolerance. Salinity stress (0.0%, 1.0%, 1.5% and 2.0% of NaCl) was induced to safflower plants after 19 days of vegetative growth. After 12 days of stress impositions, plants were harvested and analysed for various parameters. The results revealed that cultivar TSF1 showed maximum growth, dry weight, cell membrane stability and more water content in both root and leaf tissues at higher salinity levels than cultivar SM. Salt stress resulted an accumulation of more soluble sugars, amino acids, proline and glycine betaine at high salinity level confers the tolerance potential of cultivar TSF1 over cultivar SM. Salt stress induces more increase in the enzyme activity of superoxide dismutase, ascorbate peroxidase, guaiacol peroxidase and catalase in tolerant cultivar than sensitive one. The results indicate that each cultivar adopt specific strategy at distinct salinity level for resistance against salinity. The possible conclusion is that improved tolerance in cultivar TSF1 to salinity may be accomplished by better management of growth, physiological attributes and antioxidative defence mechanisms.

关键词： Safflower Salinity Stress Compatible Solutes Antioxidative Enzymes

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