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On designing an unaided authentication service with threat detection and leakage control for defeating opportunistic adversaries

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Frontiers of Computer Science 2021年第2期15卷 161-179页

作者： Nilesh chakraborty Samrat MONDAL College of Computer Science and Software Engineering Shenzhen UniversityShenzhen518060China Department of Computer Science Indian Institute of Technology PatnaBihar801106India

Unaided authentication services provide the flexibility to login without being dependent on any additional *** power of recording attack resilient unaided authentication services(RARUAS)is undeniable as,in some aspects,they are even capable of offering better security than the biometric based authentication ***,high login complexity of these RARUAS makes them far from usable in *** adopted information leakage control strategies have often been identified as the primary cause behind such high login *** recent proposals have made some significant efforts in designing a usable RARUAS by reducing its login complexity,most of them have failed to achieve the desired usability *** this paper,we have introduced a new notion of controlling the information leakage *** maintaining a good security standard,the introduced idea helps to reduce the login complexity of our proposed mechanism—named as Textual-Graphical Password-based Mechanism or TGPM,by a significant *** with resisting the recording attack,TGPM also achieves a remarkable property of threat *** the best of our knowledge,TGPM is the first RARUAS,which can both prevent and detect the activities of the opportunistic recording attackers who can record the complete login activity of a genuine user for a few login *** study reveals that TGPM assures much higher session resiliency compared to the existing authentication services,having the same or even higher login ***,TGPM stores the password information in a distributed way and thus restricts the adversaries to learn the complete secret from a single compromised server.A thorough theoretical analysis has been performed to prove the strength of our proposal from both the security and usability *** have also conducted an experimental study to support the theoretical argument made on the usability standard of TGPM.

关键词： authentication recording attack premature attack opportunistic adversary leakage control threat prevention threat detection

Bearing and uplift capacities of under-reamed piles in soft clay underlaid by stiff clay using lower-bound finite element limit analysis

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Frontiers of Structural and Civil Engineering 2021年第2期15卷 537-551页

作者： Mantu MAJUMDER Debarghya chakraborty Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur 721302India

Ensuring a safe foundation design in soft clay is always a challenging task to *** the present study,the effectiveness of under-reamed piles in soft clay underlaid by stiff clay is numerically studied using the lower-bound finite element limit analysis(LB FELA).The bearing and uplift capacities of under-reamed piles are estimated through non-dimensional factors N_(cul)and Fcul,*** factors increased remarkably and marginally compared to N_(cul)and Fcul of the piles without bulbs when the bulb is placed in stiff and soft clay,*** a given ratio of undrained cohesion of stiff to soft clay(c_(2)/c_(1)),the factors N_(cul)and Fcul moderately increased with the increase in the length-to-shaft-diameter ratio(Lu/D)and adhesion factors in soft clay(α_(s1))and stiff clay(αs2).The variation of radial stress along the pile-soil interface,distribution of axial force in the under-reamed piles,and state of plastic shear failure in the soil are also studied under axial compression and *** results of this study are expected to be useful for the estimation of the bearing and uplift capacities of under-reamed piles in uniform clay and soft clay underlaid by stiff clay.

关键词： bearing capacity uplift capacity under-reamed pile clay limit analysis

Effect of undercut on the lower bound stability of vertical rock escarpment using finite element and power cone programming

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Frontiers of Structural and Civil Engineering 2022年第8期16卷 1040-1055页

作者： Shuvankar DAS Debarghya chakraborty Department of Civil Engineering Indian Institute of Technology KharagpurWest Bengal 721302India

In the present study,the stability of a vertical rock escarpment is determined by considering the influence of *** bound finite element limit analysis in association with Power Cone Programming(PCP)is applied to incorporate the failure of rock mass with the help of the Generalized Hoek-Brown yield *** change in stability due to the presence of undercut is expressed in terms of a non-dimensional stability number(σci/γH).The variations of the magnitude ofσci/γH are presented as design charts by considering the different magnitudes of undercut offset(H/vu and wu/vu)from the vertical edge and different magnitudes of Hoek-Brown rock mass strength parameters(Geological Strength Index(GSI),rock parameter(mi),Disturbance factor(D)).The obtained results indicate that undercut can cause a severe stability problem in rock mass having poor *** the help of regression analysis of the computed results,a simplified design equation is proposed for obtainingσci/γ*** performing sensitivity analysis for an undisturbed vertical rock escarpment,we have found that the undercut height ratio(H/vu)is the most sensitive parameter followed by GSI,undercut shape ratio(wu/vu),and *** developed design equation as well as design charts can be useful for practicing engineers to determine the stability of the vertical rock escarpment in the presence of *** patterns are also presented to understand type of failure and extent of plastic state during collapse.

关键词： undercut vertical escarpment stability Hoek-Brown yield criterion PCP

Effect of interface adhesion factor on the bearing capacity of strip footing placed on cohesive soil overlying rock mass

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1494-1503页

作者： Shuvankar DAS Debarghya chakraborty Department of Civil Engineering Indian Institute of Technology KharagpurKharagpur 721302India

The problem related to bearing capacity of footing either on pure soil or on pure rock mass has been investigated over the ***,no study deals with the bearing capacity of strip footing on a cohesive soil layer overlying rock ***,by implementing the lower bound finite element limit analysis in conjunction with the second-order cone programming and the power cone programming,the ultimate bearing capacity of a strip footing located on a cohesive soil overlying rock mass is determined in this *** considering the different values of interface adhesion factor(α_(cr))between the cohesive soil and rock mass,the ultimate bearing capacity of strip footing is expressed in terms of influence factor(I _(f))for different values of cohesive soil layer cover ratio(T_(cs)/B).The failure of cohesive soil is modeled by using Mohr−Coulomb yield criterion,whereas Generalized Hoek−Brown yield criterion is utilized to model the rock mass at *** variations of I_(f) with different magnitudes of α_(cr) are studied by considering the influence of the rock mass strength parameters of beneath rock mass *** examine stress distribution at different depths,failure patterns are also plotted.

关键词： bearing capacity soil-rock interface Hoek−Brown yield criterion plasticity limit analysis

Seismic fragility analysis of bridges by relevance vector machine based demand prediction model

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Earthquake Engineering and Engineering Vibration 2022年第1期21卷 253-268页

作者： Swarup Ghosh Subrata chakraborty Department of Civil Engineering Indian Institute of Engineering Science and TechnologyShibpurHowrah 711103India

A relevance vector machine(RVM)based demand prediction model is explored for efficient seismic fragility analysis(SFA)of a bridge *** proposed RVM model integrates both record-to-record variations of ground motions and uncertainties of parameters characterizing the bridge *** efficient fragility computation,ground motion intensity is included as an added dimension to the demand prediction *** incorporate different sources of uncertainty,random realizations of different structural parameters are generated using Latin hypercube sampling *** fragility,along with its dispersions,is estimated based on the log-normal fragility model for different critical components of a *** effectiveness of the proposed RVM model-based SFA of a bridge structure is elucidated numerically by comparing it with fragility results obtained by the commonly used SFA approaches,while considering the most accurate direct Monte Carlo simulation-based fragility estimates as the *** proposed RVM model provides a more accurate estimate of fragility than conventional approaches,with significantly less computational *** addition,the proposed model provides a measure of uncertainty in fragility estimates by constructing confidence intervals for the fragility curves.

关键词： bridge structure seismic fragility analysis seismic demand model relevance vector machine

Study of flow characteristics within randomly distributed submerged rigid vegetation

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Journal of Hydrodynamics 2019年第2期31卷 358-367页

作者： Paromita chakraborty Arindam Sarkar School of Civil Engineering Kalinga Institute of Industrial Technology(KIIT)Deemed to be UniversityBhubaneswarOdishaIndia School of Infrastructure Indian Institute of Technology(IIT)Bhubaneswar AurgulBhubaneswarOdishaIndia

Flow through submerged rigid vegetation has been studied both analytically and *** Reynolds stress,present in the governing equation,has been modeled using one of the turbulent stress equations,adopted in numerous *** adva ntage of this turbulent stress model is to replace the mixing length non linear term of the stress with a linear relatio n between stress and the velocity *** velocity field and shear stress are obtained by solving the governing force balance equation numerically.A correlation,validated with the experimental results,has been developed for the relevant non-dimensional numbers.

关键词： Submerged vegetation Reynolds stress drag force stream wise velocity

A language for easy and efficient modeling of Turing machines

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Progress in Natural Science:Materials International 2007年第7期17卷 867-871页

作者： Pinaki chakraborty India New Delhi 110067 School of Computer and Systems Sciences Jawaharlal Nehru University

A Turing Machine Description Language(TMDL)is developed for easy and efficient modeling of Turing machines. TMDL supports formal symbolic representation of Turing *** grammar for the language is also *** a fast single- pass compiler is developed for *** scope of code optimization in the compiler is *** interpreter is used to simulate the exact behavior of the compiled Turing machines.A dynamically allocated and resizable array is used to simulate the infinite tape of a Turing *** procedure for simulating composite Turing machines is also *** this paper,two sample Turing machines have been designed in TMDL and their simulations are *** TMDL can be extended to model the different variations of the standard Tur- ing machine.

关键词： Turing machine compiler interpreter simulation

Influence of scattering of SH-waves in dynamic interaction of shear wall with soil layers

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Earthquake Engineering and Engineering Vibration 2020年第3期19卷 583-595页

作者： Shashi Kumar Swapan Kumar chakraborty Department of Mathematics Sarala Birla UniversityRanchi 835103India Department of Applied Mathematics Cambridge Institute of TechnologyRanchi 835103India Department of Mathematics Birla Institute of TechnologyMesraRanchi 835215India

The dynamic soil-structure interaction of a shear wall embedded in elastic isotropic and homogeneous soil layers underlain by bedrock,subjected to SH waves,is modeled in the present *** soil layers consist of irregular interfaces and it has been shown that the scattering due to the roughness of the layers has significant effect on the displacement of both the foundation and the shear *** demonstrate the phenomena indirect boundary element method(IBEM)has been used on the basis of its validation in previous problems of similar *** system response is compared with the analytical solution of the same type of model for vertically propagating incident SH *** is observed that for the low frequency of wave,displacement is abruptly high,and as a result the combination of shear wall and foundation perceives *** thickness of the soil layer,mass of the shear wall,stiffness of the bedrock and the soil layers all affects the system frequency and displacement.

关键词： soil dynamic interaction

Flavor-alignment in an S_(3)-symmetric Higgs sector and its RG-behavior

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Chinese Physics C 2022年第12期46卷 58-67页

作者： Nabarun Chakrabarty Indrani chakraborty Department of Physics Indian Institute of TechnologyKanpur 208016India

A three Higgs-doublet model exhibiting S_(3)-symmetry can predict the observed pattern of quark masses and their mixings. However, the same symmetry also introduces potential flavor-changing neutral currents(FCNCs)at the tree level. In this study, we assume that the scalar potential contains appropriate soft S_(3)-breaking terms to maintain flexible choices of scalar masses. We identify the parameters in the Yukawa Lagrangian of the quark sector responsible for such FCNCs and constrain them using data from flavor physics observables, such as meson-decays and meson-mixings. We also validate the corresponding model parameter space via renormalization group evaluation.

关键词： beyond the standard model extended Higgs sector flavor changing neutral current