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Kaiser Ahmed,김두기 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.5
This research presents the influence and sensitivity of United States Nuclear Regulatory Commission (NRC) design spectrummatched multiple ground motions on the development of fragility functions for a base-isolated nuclear power plant (BI-NPP)structure using a new function. A multi-damping adjustment function called windowed tapered cosine adjustment function in timedomain is introduced as ground motion modification scheme and its sensitivity is quantified over linearly scaled ground motions(GMs). Spectrally matched and linearly scaled unmatched, both types of GMs are scaled to same PGA level to make sure they havethe same GM intensity during structural analysis. Time history analysis of a BI-NPP is carried out to evaluate the efficiency of thewindowed adjustment function in the context of seismic response prediction. Fragility curves are developed considering peak groundacceleration (PGA) as ground motion intensity measure using the maximum likelihood method. The lateral displacement of the leadrubber bearing (LRB) has been considered as prime response parameter. It is observed that the windowed adjustment function gives1.5-2.0 times higher responses found from the ratio of maximum displacement from spectrally matched to linearly scaled GMs.
Simple, Robust & User Friendly CAPTCHA ‘InstaCap’ for Web Security
Tanvir Ahmed,Kaiser Ahmed Tushar,Sunjida Islam Nova,Md. Mahbubur Rahman 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.1
Nowadays security matter is a great challenge in web-based systems and we are using various types of HIP to defend malwares in web. But today’s conventional HIP models are able to defend bots but make a user ireful. This paper will focus on a new and simple model of CAPTCHA to defend bot-attack. This model makes a user easily to pass and also amuse them with its simplicity. Considering computational complexity, we are using a thin algorithm with some other technical tricks to make it both robust & simple.