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Nanjing, China

Huang C.-T.,University of Southern California | Huang L.,Loyola Marymount University | Qin Z.,SoutheastUniversity | Yuan H.,University of Southern California | And 3 more authors.
APSIPA Transactions on Signal and Information Processing | Year: 2014

Cloud Computing has become a well-known primitive nowadays; many researchers and companies are embracing this fascinating technology with feverish haste. In the meantime, security and privacy challenges are brought forward while the number of cloud storage user increases expeditiously. In this work, we conduct an in-depth survey on recent research activities of cloud storage security in association with cloud computing. After an overview of the cloud storage system and its security problem, we focus on the key security requirement triad, i.e., data integrity, data confidentiality, and availability. For each of the three security objectives, we discuss the new unique challenges faced by the cloud storage services, summarize key issues discussed in the current literature, examine, and compare the existing and emerging approaches proposed to meet those new challenges, and point out possible extensions and futuristic research opportunities. The goal of our paper is to provide a state-of-the-art knowledge to new researchers who would like to join this exciting new field. © The Authors, 2014. Source

Li S.,SoutheastUniversity | Li J.,SoutheastUniversity
European Physical Journal B | Year: 2016

This paper investigates the impact of social network structures of depositors on bankruns. The analyzed network structures include random networks, small-world networks andscale-free networks. Simulation results show that the probability of bank run occurrencein random networks is larger than that in small-world networks, but the probability ofbank run occurrence in scale-free networks drops from the highest to the lowest among thethree types of network structures with the increase of the proportion of impatientdepositors. The average degree of depositor networks has a significant impact on bankruns, but this impact is related to the proportion of impatient depositors and theconfidence levels of depositors in banks. © 2016, EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Source

Gong K.,SoutheastUniversity | Chen Z.N.,National University of Singapore | Chen Z.N.,Agency for Science, Technology and Research Singapore | Qing X.,Institute for Infocomm Research | And 3 more authors.
IEEE Transactions on Antennas and Propagation | Year: 2013

An empirical formula of the dominant mode resonant frequency of the cavity which is used to back a wide slot antenna is presented. The antenna is formed by etching a wide slot onto the broad wall of a substrate integrated waveguide (SIW) cavity fed by an SIW through an inductive coupling window. The widely slotted cavity resonates at the dominant mode when the wide slot radiates. Based on the analysis of the field distribution in the slotted-cavity, an empirical formula is derived to determine the dominant mode resonant frequency of the cavity with respect to the width to length ratio (WLR) of the etched slot. The empirical formula is numerically verified at a 60-GHz band. © 2012 IEEE. Source

Li P.J.,SoutheastUniversity | Li P.J.,Polytechnic University of Turin | Zhang J.,SoutheastUniversity | Zhang J.,Polytechnic University of Turin | And 2 more authors.
SHMII 2015 - 7th International Conference on Structural Health Monitoring of Intelligent Infrastructure | Year: 2015

Various kinds of uncertainty included in the monitoring data induce the classic non-uniqueness problem during finite element (FE) calibrating. Namely, multiple models with different intrinstic parameters may fit the measurement well thus the selected single "best" model may be not a truly good model to reflect structural intrinstic property. A probability-based method using a population of FE models, not the single "best" method, is proposed to deal with the above descriped problem. In the proposed method, the Markov Chain Monte Carlo technique is first performed to sample the key structural parameters representing main sources of uncertainty. Then a population of models is generated using the samples, and the posterial probability of each model is evaluated by calculating the correlation between its simulation results and measurements through the Bayesian interface. Finally, all those FE models from the stothestic sampling with their posterial probabilities are used for structural identification and performance evaluation. The advantage of the proposed method is that it not only identifies the magnitudes of structural parameters, but also output their probability distributions, thus they are appropriate for subsequent probability-based reliability analysis and risk evaluation. This feature provided by stothestic samping and statistical techniques offter the proposed method the merit to deal with the uncertainty. The example of the Phase I IASC-ASCE benchmark structure investigated successfully verified the effectiveness of the proposed method for probability-based strucrual health monitoring. © 2015, International Society for Structural Health Monitoring of Intelligent Infrastructure, ISHMII. All rights reserved. Source

Zhang Y.,SoutheastUniversity | Jia C.,SoutheastUniversity | Xu Z.,SoutheastUniversity | Wang K.,SoutheastUniversity | Pei W.,SoutheastUniversity
2011 International Conference on Wireless Communications and Signal Processing, WCSP 2011 | Year: 2011

According to the correlation between adjacent blocks of the carrier image, two algorithms, called STDM-CO-MW and STDM-PCO-MW, are proposed. By using the quantization step calculated from the previous secondary block to modulate the latter secondary block, STDM-CO-MW solves the problem of the difference of quantization step between embedding and decoding. In order to raise the correlation between adjacent secondary blocks, STDM-PCO-MW exchanges the pixels between the previous secondary block and the latter one before embedding. As a result STDM-PCO-MW is more robust. Thanks to the quantization step calculated above based on modified Watson model, we find that the quantization step of our algorithms varies linearly with the brightness of the carrier image adaptively. From the results of numerical simulation, it is obvious that our proposed algorithms are robust to JPEG compression, Gaussian noise and gain attack. Compared with AQIM and general STDM based on Watson model, our algorithms have a great improvement in performance. © 2011 IEEE. Source

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