Design of Cognitive Fog Computing for Intrusion Detection in Internet of Things

Prabavathy, S.,Sundarakantham, K.,Shalinie, S.Mercy The Korean Institute of Communications and Informa 2018 Journal of communications and networks Vol.20 No.3

Internet of things (IoT) is penetrating into every aspect of our lives including our body, our home and our living environment along with numerous security challenges. With rapidly growing number of connected devices in IoT, the scope for cyber-attack also increases exponentially. Therefore an effective intrusion detection system (IDS) is needed to efficiently detect the attack at faster rate in highly scalable and dynamic IoT environment. In this paper, a novel intrusion detection technique is proposed based on fog computing using Online Sequential Extreme Learning Machine (OS-ELM) which can intelligently interpret the attacks from the IoT traffic. In the proposed system, the existing centralized cloud intelligence in detecting the attack is distributed to local fog nodes to detect the attack at faster rate for IoT application. The distributed architecture of fog computing enables distributed intrusion detection mechanism with scalability, flexibility and interoperability. The analysis of the proposed system proves to be efficient in terms of response time and detection accuracy.

Study of exterior beam-column joint with different joint core and anchorage details under reversal loading

S. Rajagopal,S. Prabavathy 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.6

In the present study, in reinforced concrete structures, beam-column connections are one of the most critical regions in areas with seismic susceptibility. Proper anchorage of reinforcement is vital to enhance the performance of beam-column joints. Congestion of reinforcement and construction difficulties are reported frequently while using conventional reinforcement detailing in beam-column joints of reinforced concrete structures. An effort has been made to study and evaluate the performance of beamcolumn joints with joint detailing as per ACI-352 (mechanical anchorage), ACI-318 (conventional hooks bent) and IS-456(full anchorage conventional hooks bent) along with confinement as per IS-13920 and without confinement. Apart from finding solutions for these problems, significant improvements in seismic performance, ductility and strength were observed while using mechanical anchorage in combination with X-cross bars for less seismic prone areas and X-cross bar plus hair clip joint reinforcement for higher seismic prone areas. To evaluate the performances of these types of anchorages and joint details, the specimens were assembled into four groups, each group having three specimens have been tested under reversal loading and the results are presented in this paper.

Design of Cognitive Fog Computing for Intrusion Detection in Internet of Things

S.Prabavathy,K.Sundarakantham,S.Mercy Shalinie 한국통신학회 2018 Journal of communications and networks Vol.20 No.3

Internet of things (IoT) is penetrating into every aspectof our lives including our body, our home and our living environmentalong with numerous security challenges.With rapidly growingnumber of connected devices in IoT, the scope for cyber-attackalso increases exponentially. Therefore an effective intrusion detectionsystem (IDS) is needed to efficiently detect the attack at fasterrate in highly scalable and dynamic IoT environment. In this paper,a novel intrusion detection technique is proposed based on fog computingusing Online Sequential Extreme Learning Machine (OSELM)which can intelligently interpret the attacks from the IoTtraffic. In the proposed system, the existing centralized cloud intelligencein detecting the attack is distributed to local fog nodesto detect the attack at faster rate for IoT application. The distributedarchitecture of fog computing enables distributed intrusiondetection mechanism with scalability, flexibility and interoperability. The analysis of the proposed system proves to be efficientin terms of response time and detection accuracy.

Construction of heterostructure CoWO4/g-C3N4 nanocomposite as an efficient visible-light photocatalyst for norfloxacin degradation

S. Lakshmi Prabavathi,Kadarkarai Govindan,K. Saravanakumar,장암,Velluchamy Muthuraj 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-

The CoWO4 nanoparticles assembled with g-C3N4 nanosheets were successfully fabricated by means of asimple hydrothermal method, followed by ultrasonication. The surface topography, crystalline structure,chemical status, and optical properties of as-prepared materials are well characterized herein. Thesestudies unveil the formation of CoWO4 nanoparticles assembled on the surface of g-C3N4 nanosheetswith good crystallinity. EDX and XPS studies substantiated that there were no impurities in thesynthesized photocatalyst materials. Furthermore, surface topographical (TEM) analysis affirms thatCoWO4 nanoparticles were successfully anchored to g-C3N4 nanosheet. This worthy interfacial contactbetween CoWO4 and g-C3N4 leads the transfer and separation of photo-induced charge carriers. Theeffect of catalyst loading and initial substrate concentrations on photocatalytic degradation of norfloxacinby as-prepared samples were examined under visible light. We found that the rate of CoWO4 and g-C3N4photocatalytic degradation of norfloxacin was 3.18 times and 2.69 times higher than that of pure g-C3N4and CoWO4, respectively. Enhanced photocatalytic activity was because the synergism between CoWO4nanoparticles and g-C3N4 nanosheets inhibit the fast recombination of photogenerated e –h+ pairs. Inaddition, the radical scavenger study substantiates that OH plays dominate role for norfloxacindegradation rather than O2. A possible mechanism responsible for photodegradation of the Z-schemewas ultimately proposed. This work can be useful in the rational design and delivery of new types ofZ-scheme photocatalysts.

Seismic behavior evaluation of exterior beam-column joints with headed or hooked bars using nonlinear finite element analysis

Rajagopal, S.,Prabavathy, S.,Kang, Thomas H.K. 테크노프레스 2014 Earthquakes and structures Vol.7 No.5

This paper studies the response of seismic behavior of reinforced concrete exterior beam-column joints under reversal loading with different anchorages and joint core details. The joint core was detailed without much confinement (group-I) and/or with proposed X-cross bars in the core (group-II). The beam longitudinal reinforcement's anchorages were designed as per ACI 352 (headed bars), ACI 318 (conventional $90^{\circ}$ bent hooks) and IS 456 ($90^{\circ}$ bent hooks with extended tails). The nonlinear finite element analysis response of the beam-column joints was studied, along with initial and progressive cracks up to failure. The experimental and analytical results were compared and presented in this paper to make more scientific conclusions.

Study of exterior beam-column joint with different joint core and anchorage details under reversal loading

Rajagopal, S.,Prabavathy, S. Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.6

In the present study, in reinforced concrete structures, beam-column connections are one of the most critical regions in areas with seismic susceptibility. Proper anchorage of reinforcement is vital to enhance the performance of beam-column joints. Congestion of reinforcement and construction difficulties are reported frequently while using conventional reinforcement detailing in beam-column joints of reinforced concrete structures. An effort has been made to study and evaluate the performance of beam-column joints with joint detailing as per ACI-352 (mechanical anchorage), ACI-318 (conventional hooks bent) and IS-456(full anchorage conventional hooks bent) along with confinement as per IS-13920 and without confinement. Apart from finding solutions for these problems, significant improvements in seismic performance, ductility and strength were observed while using mechanical anchorage in combination with X-cross bars for less seismic prone areas and X-cross bar plus hair clip joint reinforcement for higher seismic prone areas. To evaluate the performances of these types of anchorages and joint details, the specimens were assembled into four groups, each group having three specimens have been tested under reversal loading and the results are presented in this paper.

Algorithm for Vertical Handover Decision using Least Cost Function

Siddharth Goutam,Srija Unnikrishnan,Sundary S. Prabavathy,Archana Karandikar 대한전자공학회 2021 IEIE Transactions on Smart Processing & Computing Vol.10 No.1

Next Generation Networks (NGNs) will be heterogeneous due to the presence of the various Radio Access Technologies (RATs). The number of smartphone users is increasing exponentially, and smartphones are being equipped with multiple network interfaces. Smartphone users desire to be connected to the best network among the available networks while moving across geography. The requirement of seamless connectivity along with a maintained Quality of Service (QoS) can be achieved through Vertical Handover (VHO).Vertical Handover is an important factor to be considered in network design. The full potential of various access networks can be achieved using efficient and effective Vertical Handover Decision Algorithms (VHDAs). In this context, the research paper proposes a model for VHDA based on a Least Cost function. The primary function of VHDA is to provide “All-Time Connectivity to the Best Possible Network with the Best Quality of Service at the Least Cost”. The main parameters considered in the VHDA are RSS, bandwidth, network coverage, packet loss, jitter, and latency.