Identifying the leaders and main conspirators of the attacks in terrorist networks

Abhay Kumar Rai(Abhay Kumar Rai ),Sumit Kumar(Sumit Kumar ) 한국전자통신연구원 2022 ETRI Journal Vol.44 No.6

This study proposes a novel method for identifying the primary conspirators involved in terrorist activities. To map the information related to terrorist activities, we gathered information from different sources of real cases involving terrorist attacks. We extracted useful information from available sources and then mapped them in the form of terrorist networks, and this mapping provided us with insights in these networks. Furthermore, we came up with a novel centrality measure for identifying the primary conspirators of a terrorist attack. Because the leaders of terrorist attacks usually direct conspirators to conduct terrorist activities, we designed a novel algorithm that can identify such leaders. This algorithm can identify terrorist attack leaders even if they have less connectivity in networks. We tested the effectiveness of the proposed algorithms on four real-world datasets and conducted an experimental evaluation, and the proposed algorithms could correctly identify the primary conspirators and leaders of the attacks in the four cases. To summarize, this work may provide information support for security agencies and can be helpful during the trials of the cases related to terrorist attacks.

Bi-axial and shear buckling of laminated composite rhombic hypar shells

Abhay K. Chaubey,Shubham Raj,Pratik Tiwari,Ajay Kumar,Anupam Chakrabarti,K.K. Pathak 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.74 No.2

The bi-axial and shear buckling behavior of laminated hypar shells having rhombic planforms are studied for various boundary conditions using the present mathematical model. In the present mathematical model, the variation of transverse shear stresses is represented by a second-order function across the thickness and the cross curvature effect in hypar shells is also included via strain relations. The transverse shear stresses free condition at the shell top and bottom surfaces are also satisfied. In this mathematical model having a realistic second-order distribution of transverse shear strains across the thickness of the shell requires unknown parameters only at the reference plane. For generality in the present analysis, nine nodes curved isoparametric element is used. So far, there exists no solution for the bi-axial and shear buckling problem of laminated composite rhombic (skew) hypar shells. As no result is available for the present problem, the present model is compared with suitable published results (experimental, FEM, analytical and 3D elasticity) and then it is extended to analyze bi-axial and shear buckling of laminated composite rhombic hypar shells. A C0 finite element (FE) coding in FORTRAN is developed to generate many new results for different boundary conditions, skew angles, lamination schemes, etc. It is seen that the dimensionless buckling load of rhombic hypar increases with an increase in c/a ratio (curvature). Between symmetric and anti-symmetric laminations, the symmetric laminates have a relatively higher value of dimensionless buckling load. The dimensionless buckling load of the hypar shell increases with an increase in skew angle.

Identification of High-Specificity H-NS Binding Site in LEE5 Promoter of Enteropathogenic Esherichia coli (EPEC)

Abhay Prasad Bhat,신민상,최현일 한국미생물학회 2014 The journal of microbiology Vol.52 No.7

Histone-like nucleoid structuring protein (H-NS) is a small but abundant protein present in enteric bacteria and is involved in compaction of the DNA and regulation of the transcription. Recent reports have suggested that H-NS binds to a specific AT rich DNA sequence than to intrinsically curved DNA in sequence independent manner. We detected two high-specificity H-NS binding sites in LEE5 promoter of EPEC centered at -110 and -138, which were close to the proposed consensus H-NS binding motif. To identify H-NS binding sequence in LEE5 promoter, we took a random mutagenesis approach and found the mutations at around -138 were specifically defective in the regulation byH-NS. It was concluded that H-NS exertsmaximumrepression via the specific sequence at around -138 and ubsequently contacts α subunit of RNAP through oligomerization.

Correlation between Meyer–Neldel rule and phase separation in Se98xZn2Inx chalcogenide glasses

Abhay Kumar Singh,Neeraj Mehta,Kedar Singh 한국물리학회 2009 Current Applied Physics Vol.9 No.4

The present work reports the observation of Meyer–Neldel rule for the thermally activated crystallization of glassy Se98-xZn2Inx (0 ≼ x ≼ 10) alloys. We have observed a strong co-relation between the pre-exponential factor K0 of rate constant K(T) of crystallization and activation energy of crystallization Ec in the present case. This indicates the presence of compensation effect for the non-isothermal crystallization process in the present glassy system, which is explained in terms of phase separation of the present alloys due to flaw bonds of these amorphous solids. The present work reports the observation of Meyer–Neldel rule for the thermally activated crystallization of glassy Se98-xZn2Inx (0 ≼ x ≼ 10) alloys. We have observed a strong co-relation between the pre-exponential factor K0 of rate constant K(T) of crystallization and activation energy of crystallization Ec in the present case. This indicates the presence of compensation effect for the non-isothermal crystallization process in the present glassy system, which is explained in terms of phase separation of the present alloys due to flaw bonds of these amorphous solids.

A Fundamental Study on Droplet Evaporation in Wet Compression Systems

Abhay Mohan,Palani Kumar Chidambaram,Abhilash Suryan,Heuy Dong Kim(김희동) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11

For the current investigation, the gas liquid two-phase media are modeled as air involving fine droplet or droplets of water. A cylinder-piston system is modeled which contains air with single or multiple droplets of water. The compression process is achieved by the movement of the piston. During the compression process, thermodynamic properties such as temperature and pressure are investigated in detail. Analytical equations have been derived to obtain the transformation in fluid properties. The results thus obtained are discussed for different conditions of overspray and initial absolute humidity of the air inside the cylinder. The thermodynamic curves obtained are seen to deviate significantly from the dry isentropic curve ( PVγ=constant) with decreasing droplet diameters and increasing mass of droplets. This deviation can be associated with the latent heat absorbed by the evaporating droplets during the process of compression.

Design of IIR Filters with Definite Group Delay (Lowpass Equalization) using LabVIEW

Abhay kumar singh,Lalit singh garia 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.7

Digital filters with lined phase responses that is constant group delay responses are desirable in many uses for signal treating. In this paper, a new method is proposed for scheming maximally smooth IIR filters with constant group delay in the pass band. This paper presents a concept of IIR filters with equalized group delay response. The group delay has been equalized by all pass filter. In this IIR filter design some constant group delay has been introduce and effect of group delay on phase is studied. At some extent of frequency group delay of compensated filter is linear so that phase of the IIR filter is linear at particular range of frequency. This paper looks at a compromise in which the IIR filter is followed by a allpass filter, which adaptively tries to linearize the overall phase response but leaves the magnitude response unchanged.

OSCILLATION OF SECOND ORDER SUBLINEAR NEUTRAL DELAY DYNAMIC EQUATIONS VIA RICCATI TRANSFORMATION

ABHAY KUMAR SETHI 한국전산응용수학회 2018 Journal of applied mathematics & informatics Vol.36 No.3

In this work, we establish oscillation of the second order sublinear neutral delay dynamic equations of the form: \begin{eqnarray*} (r(t)((x(t)+p(t)x(\tau(t)))^\Delta)^\gamma)^\Delta+q(t) x^\gamma(\alpha(t))+v(t)x^\gamma(\eta(t))=0 \end{eqnarray*} on a time scale $\mathcal{T}$ by means of Riccati transformation technique, under the assumptions \begin{eqnarray*} \int_{t_0}^{\infty}\left(\frac{1}{r(t)}\right)^\frac{1}{\gamma}\Delta t&=&\infty, \end{eqnarray*} and \begin{eqnarray*} \int_{t_0}^{\infty}\left(\frac{1}{r(t)}\right)^\frac{1}{\gamma}\Delta t& < &\infty, \end{eqnarray*} for various ranges of $p(t)$, where $0<\gamma \leq 1$ is a quotient of odd positive integers.

Offline Signature Verification Using Critical Region Matching

Abhay Bansal,Bharat Gupta,Gaurav Khandelwal,Shampa Chakraverty 보안공학연구지원센터(IJSIP) 2009 International Journal of Signal Processing, Image Vol.2 No.1

Cold electronics based 128 temperature sensor interface with 14 leads for testing of high Tc superconducting cable

Abhay Singh Gour,S. Thadela,V. V. Rao 한국초전도저온학회 (구 한국초전도저온공학회) 2018 한국초전도저온공학회논문지 Vol.20 No.1

Synthesis of low-cost HNO3-functionalized acetylene black carbon supported Pt-Ru/CAB nano electrocatalysts for the application in direct ethanol fuel cell (DEFC)

Abhay Kumar Choudhary,Hiralal Pramanik 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.10

Ethanol electrooxidation was thoroughly investigated on laboratory synthesized Pt-Ru nano electrocatalysts. Low cost acetylene black carbon functionalized by HNO3 was used as support material for synthesized Pt-Ru/CAB electrocatalysts. The effect of synthesis methods on the major electrocatalytic properties of Pt-Ru/CAB electrocatalysts were studied thoroughly. The electrocatalysts Pt-Ru/CAB were manufactured by different chemical reduction methods. The electrocatalysts were designated as Pt-Ru/CAB-PLM for polyol reduction and Pt-Ru/CAB-FAM for formic acid reduction method, respectively. The electrocatalyst synthesis method and treatment of support material remarkably enhanced the catalytic performance of synthesized Pt-Ru/CAB electrocatalysts. The commercial Pt-Ru/C was selected as anode electrocatalyst for comparative study with the synthesis electrocatalyst in terms of performance in half cell study and in a single direct ethanol fuel cell as well. In the direct ethanol fuel cell, synthesized Pt-Ru/CAB-PLM produced maximum open circuit voltage of 0.71 V and highest power density of 6.02 mW/cm2 at a current density of 19.52mA/ cm2 at the room temperature of 35 oC. Whereas, the maximum power density of 5.13mW/cm2 at a current density of 18.70 mA/cm2 and open circuit voltage of 0.717 V were obtained for commercial Pt-Ru/C electrocatalyst at the same temperature (35 oC). The power density enhanced around 2.17 times when cell temperature was increased from 35 oC to 80 oC using anode electrocatalyst Pt-Ru/CAB-PLM. The performance of synthesized Pt-Ru/CAB-PLM is excellent for the ethanol electrooxidation and, thus, could replace commercial Pt-Ru/C.