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Defence Technology（防务技术） 2022年第6期18卷 963-975页

作者： S.Suresh kumar P.A.shankar k.Lalith kumar Department of Mechanical Engineering Sri Sivasubramaniya Nadar College of EngineeringKalavakkamChennai603110India

High velocity ballistic impact deformation behaviour of Titanium/GFRP Fiber Metal Laminates(FML)has been *** single and multiple projectiles impact conditions were ***/GFRP FML targets were fabricated with addition of 5%and 10%weight percentage of boron carbide(B_(4)C)*** properties of Ti/GFRP FML targets were determined as per ASTM *** velocity ballistic experiments were conducted using Armour Piercing Projectile(APP)of diameter 7.62 mm and velocity ranging between 350 and 450 m/*** of penetration of the projectile into the target was *** deformation behaviour of Ti/GFRP targets with and without the presence of ceramic powder(B_(4)C)was investigated.“Ductile hole growth”failure mode was observed for pure GFRP target when subjected to single projectile impact whereas“plugging”failure mode was noted for Ti/GFRP *** presence of B_(4)C(5%by weight)particles has significantly improved the ballistic resistance of the Ti/GFRP FML target by offering frictional resistance to the projectile *** addition(10%by weight)of B_(4)C has reduced the ballistic performance due to *** of the targets showed‘brittle cracking’or‘fragmentation’*** compared to the published results of Aluminium(Al 1100/GFRP and Al 6061/GFRP)FMLs,Ti/GFRP FML showed lesser DoP which increases its potential application to aerospace industry.

关键词： Ti/GFRP FML Ballistic impact Armour piercing projectile Boron carbide Depth of penetration Plugging

Intrusion detection and prevention system for an IoT environment

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Digital Communications and Networks 2022年第4期8卷 540-551页

作者： Ajay kumar k.Abhishek M.R.Ghalib A.shankar X.Cheng Department of Computer Science and Engineering NIT PatnaBiharIndia Faculty of Science Engineering Computing(SEC)De Montfort UniversityDubaiUnited Arab Emirates Department of CSE Amity School of Engineering and TechnologyAmity UniversityUttar PradeshIndia Department of Computer Science Middlesex UniversityLondonUK

Internet of Things(IoT)security is the act of securing IoT devices and *** devices,including industrial machines,smart energy grids,and building automation,are extremely *** the goal of shielding network systems from illegal access in cloud servers and IoT systems,Intrusion Detection Systems(IDSs)and Network-based Intrusion Prevention Systems(NBIPSs)are proposed in this *** intrusion prevention system is proposed to realize NBIPS to safeguard top to bottom *** proposed NBIPS inspects network activity streams to identify and counteract misuse *** NBIPS is usually located specifically behind a firewall,and it provides a reciprocal layer of investigation that adversely chooses unsafe *** IPS sensors can be installed either in an inline or a passive *** inline sensor is installed to monitor the traffic passing through *** sensors are installed to stop attacks by blocking the traffic using an IoT signature-based protocol.

关键词： IDS and IPS Cloud Firewall Denial of service Smart environment Internet of things NBIPS

In-plane and out-of-plane quasi-static compression performance enhancement of 3D printed re-entrant diamond auxetic metamaterial with geometrical tuning and fiber reinforcement

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Defence Technology(防务技术) 2023年第7期25卷 1-17页

作者： Niranjan Chikkanna shankar krishnapillai Velmurugan Ramachandran Department of Mechanical Engineering Indian Institute of Technology Madras600036India Department of Aerospace Engineering Indian Institute of Technology Madras600036India

Auxetic materials are cellular materials with a unique property of negative Poisson’s *** auxeticity and performance of these metamaterials utterly depend on the geometrical parameters and loading *** the first time,the quasi-static uniaxial compression performance of fused filament fabricated re-entrant diamond auxetic metamaterial is evaluated in the x-direction(in-plane)and z-direction(out-of-plane).The most commonly used thermoplastic feedstock,Acrylonitrile butadiene styrene,is considered a material of *** effect of influential geometrical parameters of the re-entrant diamond structure and printing parameter is systematically studied using Taguchi’s design of ***-based multi-objective optimisation technique has been adopted to arrive at the optimal *** are made to improve the stiffness and strength of the structure with fibre *** glass fibre reinforcements have enhanced specific strength and stiffness in both in-plane and out-ofplane directions.A sevenfold and thirteen times increase in specific strength and energy absorption is evident for glass fibre-reinforced structures in out-of-plane directions compared to in-plane *** tuning of geometrical parameters of the re-entrant diamond structure can result in a Poisson’s ratio of up to-3.49 when tested in the *** parametric study has illustrated the tailorability of the structure according to the application *** statistical study has signified each considered parameter’s contribution to the compression performance characteristics of the 3D printed re-entrant diamond auxetic metamaterial.

关键词： Auxeticity Fibre reinforcement Tailorability Anisotropy Geometrical influence Property enhancement

Alkali activated slag-fly ash concrete incorporating precious slag as fine aggregate for rigid pavements

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Journal of Traffic and Transportation Engineering(English Edition) 2022年第1期9卷 78-92页

作者： Avinash Talkeri A.U.Ravi shankar Department of Civil Engineering National Institute of Technology KarnatakaSurathkalMangalore 575025India

This study aims to develop the alkali activated slag-fly ash concrete(AASFC) using precious slag(PS) ball as the fine aggregate. The slag-fly ash proportion, sodium silicate/sodium hydroxide(SS/SH) ratio and sodium hydroxide concentration are the prime variables. The fresh concrete properties like workability, setting time and the hardened concrete properties of AASFC developed under ambient curing were analyzed and similar way by replacing with fly ash(FA). The sodium hydroxide concentration of 8 M, 10 M and 12 M, SS/SH ratio of 1.0, 1.5 and 2.0, alkaline liquid to binder ratio of 0.35 and variation in slag-fly ash proportion as major inputs for mix design. The test results showed that, the fresh state of AASFC blend has a shorter setting time of 12-16 min, because of calcium mineral from the FA, the workability and setting time of AASFC mix was enhanced by the addition of the trisodium phosphate as a retarder. At the higher SS/SH extent, the workability and setting time exaggerated, whereas the increased FA content and sodium hydroxide concentration had a greater influence on the fresh state of concrete. Also, the sodium hydroxide concentration, SS/SH ratio and slag-fly ash proportion are the most inducing parameters on the workability, setting time and strength parameters of AASFC.

关键词： Road engineering Slag-fly ash proportion SS/SH ratio Molarity AASFC PS ball

Frequency domain analysis of pre-stressed elastomeric vibration isolators

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Defence Technology（防务技术） 2023年第7期25卷 33-47页

作者： S.Somanath R.Marimuthu shankar krishnapillai Indian Space Research Organisation Anthariksh BhavanNew BEL RoadBengaluru560231India STR/VSSC Indian Space Research OrganisationThiruvananthapuram695022India Department of Mechanical Engineering IIT MadrasChennai600036India

Two types of elastomeric vibration isolators used for equipment vibration isolation in aerospace vehicles are considered for the present study. These isolators are constructed using elastomers mounted in steel encasings. These isolators are initially deformed statically and dynamic loads are applied on the deformed configuration. To capture the static deformation, equivalent static load corresponding to its load rating and specified displacements are created. Static deformation is computed using Finite Element methods with four node axi-symmetric element which include the geometric non-linear effect for steel and with standard Yeoh hyper-elastic material model for elastomers(Muhammed and Zu, 2012) [1]. Yeoh material constants are derived from uni-axial tension test data of the elastomer specimen. These isolators are subjected to harmonic and random excitations in the pre-deformed state. For numerical analysis, elastomeric constants at dynamic conditions are obtained as complex function of frequency using Dynamic Mechanical Analyzer(DMA) for a range of frequencies. The standard material model of Yeoh is modified incorporating frequency dependant material characteristics and damping in the range of frequencies of interest. A multiplicative non-separable variables law is derived for Yeoh material model to include the effect of static pre-stress, based on the methodology given in literature(Nashif et al.,1985;Beda et al., 2014) [2,3]. The modifications of Yeoh model suitable for frequency domain analysis is the novelty in the present study. In the analysis, while dynamic loads are applied, the configuration is updated considering initial static loading. The frequency response of the isolators is computed using material properties evaluated at progressive dynamic strains until a match in natural frequency is observed. Appropriate damping corrections are then incorporated to match the test observed transmissibility. Then updated material properties are used to compute the

关键词： Elastomer Isolator Axi-symmetric Frequency Random Response Strain amplitude Complex modulus Transmissibility

Unravelling the situation of malaria misdiagnosis in India:Its adverse impact and management strategies

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Asian Pacific Journal of Tropical Medicine 2022年第7期15卷 290-292页

作者： Gaurav kumar Hari shankar ICMR-National Institute of Malaria Research Sector-8DwarkaDelhiIndia Indian Council of Medical Research New DelhiIndia

Malaria is a public health problem in several parts of India.A continuous decrease in malaria has been reported in India,from about 2.0 million cases in 2000 to about 0.2 million in 2020[1].In February 2016,the Government of India formally launched the National Framework for Malaria Elimination,which outlines the strategies for eliminating malaria from India by 2030[2].It aims to interrupt indigenous malaria transmission(zero indigenous case reporting)throughout the country,prevent the re-establishment of transmission in areas where it has been eliminated,and maintain national malaria-free status by 2030 and beyond,using the existing intervention tools and *** 2017,India launched its five-year National Strategic Plan for Malaria Elimination,which is mainly district focused rather than the National Framework for Malaria Elimination,which was state focused[3].India has shown a 71%reduction of malaria cases in 2019 compared to 2015,which was achieved by strengthening surveillance,improving diagnosis and treatment,and intensive vector control measures using existing *** India,Odisha state contributed 37.4%of total malaria cases in 2015,which was reduced to 12%in 2019 using the Durgama Anchalare Malaria Nirakaran initiative and comprehensive case management of malaria[4].

关键词： malaria Malaria India

Decision Tree Based key Management for Secure Group Communication

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Computer Systems Science & Engineering 2022年第8期42卷 561-575页

作者： P.Parthasarathi S.shankar Department of Computer Science and Engineering Bannari Amman Institute of TechnologySathyamangalam638401India Department of Computer Science and Engineering Hindusthan College of Engineering and TechnologyCoimbatore641032India

Group communication is widely used by most of the emerging network applications like telecommunication,video conferencing,simulation applications,distributed and other interactive *** group communication plays a vital role in case of providing the integrity,authenticity,confidentiality,and availability of the message delivered among the group members with respect to communicate securely between the inter group or else within the *** secure group communications,the time cost associated with the key updating in the proceedings of the member join and departure is an important aspect of the quality of service,particularly in the large groups with highly active ***,the paper is aimed to achieve better cost and time efficiency through an improved DC multicast routing protocol which is used to expose the path between the nodes participating in the group *** this process,each node constructs an adaptive Ptolemy decision tree for the purpose of generating the contributory *** of the node is comprised of three keys which will be exchanged between the nodes for considering the group key for the purpose of secure and cost-efficient group *** rekeying process is performed when a member leaves or adds into the *** performance metrics of novel approach is measured depending on the important factors such as computational and communicational cost,rekeying process and formation of the *** is concluded from the study that the technique has reduced the computational and communicational cost of the secure group communication when compared to the other existing methods.

关键词： key generation adaptive Ptolemy decision tree cost reduction secure group communication

Entire onion source-derived redox porous carbon electrodes towards efficient quasi-solid-state solar charged hybrid supercapacitor

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Journal of Materials Science & Technology 2022年第30期125卷 118-127页

作者： Edugulla Girija shankar Amit kumar Das Jae Su Yu Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence ElectronicsKyung Hee UniversityGyeonggi-do 17104Republic of Korea

Biomass-derived electrodes inherently containing redox-active species have gained extensive attention recently due to their availability,eco-friendliness,sustainability,and low *** report novel binder-free faradic surface redox onion-derived carbon positive electrode with nano regime particles by hydrothermal synthesis and Na^(+)and Cl^(−)ions diffused porous carbon negative electrode via a carbonization ***-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy confirmed the presence of oxidized sulfur and(N-6)pyridinic N-based redox groups inherently present in the as-prepared *** electrochemical analysis of the positive electrode revealed its faradic redox type of energy storage mechanism with an excellent specific capacitance of 1805 Fg^(-1) at the current density of 3 Ag^(-1) as well as appreciable long-term cycling stability(76.8%retention after 10000 charge-discharge cycles).Meanwhile,the negative electrode exhibited a maximum specific capacitance of 373 Fg^(-1) at 1 Ag^(-1) with outstanding long-term cycling stability(100.7%retention after 10000 cycles).The fabricated polyvinyl alcohol-potassium hydroxide gel electrolyte-based quasi-solid-state hybrid supercapacitor(QHSC)delivered excellent energy density and power density of 19.94 Wh kg^(-1) and 374.99 W kg^(-1),respectively with an ultralong cyclic life(102.3% retention)over 10000 ***,the QHSC was connected to a solar panel to store renewable *** charged QHSC effectively powered a speedometer,enlightening its potential application in advanced sustainable energy storage systems.

关键词： Binder-free Biomass Green source Hybrid supercapacitor Solar energy storage Faradic redox type

Codimension-2 bifurcation in a discrete predator-prey system with constant yield predator harvesting

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生物数学学报:英文版 2023年第5期16卷 165-191页

作者： Anuraj Singh Vijay shankar Sharma ABV-Indian Institute of Information Technology and Management Gwalior Madhya PradeshIndia

This work investigates the bifurcation analysis in a discrete-time Leslie-Gower predatorprey model with constant yield predator *** stability analysis for the fixed points of the discretized model is shown *** this study,the model undergoes codimension-1 bifurcation such as fold bifurcation(limit point),flip bifurcation(perioddoubling)and Neimark-Sacker bifurcation at a positive fixed ***,the model exhibits codimension-2 bifurcations,including Bogdanov-Takens bifurcation and generalized fip bifurcation at the fixed *** each bifurcation,by using the critical normal form coefficient method,various critical states are *** validate our analytical findings,the bifurcation curves of fixed points are drawn by using *** system exhibits interesting rich dynamics including limit cycles and ***,it has been shown that the predator harvesting may control the chaos in the system.

关键词： Flip bifurcation Neimark-Sacker bifurcation generalized fip bifurcation Bogdanov-Takens bifurcation harvesting

Semantic Based Greedy Levy Gradient Boosting Algorithm for Phishing Detection

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Computer Systems Science & Engineering 2022年第5期41卷 525-538页

作者： R.Sakunthala Jenni S.shankar Department of Computer Science and Engineering Hindusthan College of Engineering and TechnologyCoimbatore641032India

The detection of phishing and legitimate websites is considered a great challenge for web service providers because the users of such websites are *** websites also create traffic in the entire *** phishing issue is the broadening malware of the entire network,thus highlighting the demand for their detection while massive datasets(i.e.,big data)are *** the application of boosting mechanisms in phishing detection,these methods are prone to significant errors in their output,specifically due to the combination of all website features in the training *** upcoming big data system requires MapReduce,a popular parallel programming,to process massive *** address these issues,a probabilistic latent semantic and greedy levy gradient boosting(PLS-GLGB)algorithm for website phishing detection using MapReduce is proposed.A feature selection-based model is provided using a probabilistic intersective latent semantic preprocessing model to minimize errors in website phishing ***,the missing data in each URL are identified and discarded for further processing to ensure data ***,with the preprocessed features(URLs),feature vectors are updated by the greedy levy divergence gradient(model)that selects the optimal features in the URL and accurately detects the ***,greedy levy efficiently differentiates between phishing websites and legitimate *** are conducted using one of the largest public corpora of a website phish tank *** show that the PLS-GLGB algorithm for website phishing detection outperforms stateof-the-art phishing detection *** amounts of phishing detection time and errors are also saved during the detection of website phishing.

关键词： Web service providers probabilistic intersective latent semantic greedy levy divergence gradient phishing detection big data