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410 results on '"Kougianos, Elias"'

179. A new region aware invisible robust blind watermarking approach.

Author

Albalawi, Umar, Mohanty, Saraju, and Kougianos, Elias

Subjects
DIGITAL watermarking, DATA protection, DIGITAL media, ALGORITHMS, DIGITAL rights management
Abstract

The multimedia revolution has made a strong impact on our society. The explosive growth of Internet access to this digital information has generated new opportunities and challenges. The ease of editing and duplicating information in the digital domain has created copyright protection concerns for content providers. Various schemes to embed secondary data in digital media have been investigated to preserve copyright and to discourage unauthorized duplication. In order to achieve the required level of protection to digital information, digital watermarking is a viable solution. This paper proposes a novel invisible watermarking scheme: a Discrete Cosine Transform (DCT) domain based watermark embedding and blind extraction algorithm for copyright protection of color images. The proposed algorithm is optimized in terms of robustness, computational load, and quality of the image. Testing of the proposed watermarking scheme's robustness and security via different benchmarks as well as comparison with a Discrete Wavelet Transform (DWT) approach proves its resilience to digital attacks. The results show that the Peak Signal to Noise Ratio (PSNR) value obtained under no attack conditions in the proposed algorithm is above 41.81 dB, which is higher than most of the existing watermark algorithms. The results from the detector's response also show that the proposed algorithm has a better security performance than most of the existing algorithms. The architecture for hardware implementation of the proposed algorithm is also presented and the results from the architecture show a PSNR value of 44.37 dB. This verifies that the presented algorithm is more effective than existing algorithms such as image adaptive watermarking, image adaptive watermark creation, zerotree wavelet, and 9/7 biorthogonal wavelet lifting. [ABSTRACT FROM AUTHOR]

Published
2017
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194. Simscape® based ultra-fast design exploration: graphene-nanoelectronic circuit case studies.

Author

Joshi, Shital, Mohanty, Saraju, and Kougianos, Elias

Subjects
GRAPHENE, INTEGRATED circuit design, FIELD-effect transistors, LOW noise amplifiers, ANALOG circuits
Abstract

SPICE has been the corner stone of integrated circuit simulation since the 1970s. The device-level options that are available for SPICE/analog simulators to simulate a circuit netlist are typically compact models and/or Verilog-A structural and behavioral models. Though these simulations are very accurate, for large and complex circuits/systems they are extremely slow and even computationally infeasible. Thus, as a paradigm shift of the conventional design simulation flow, this paper presents a complete Simscapebased design and simulation flow for ultra-fast design exploration of graphene based nanoelectronic systems. A behavioral model for a dual gate graphene field effect transistor (GFET) is modeled in Simscapebased on the drift-diffusion conduction mechanism. The kink region of the $$I-V$$ characteristic is modeled via a displacement current. For case study design circuits, an all graphene based low noise amplifier and an LC-tank voltage controlled oscillator are presented. The results show that the proposed design alternative to simulate analog circuits and systems is a viable option in addition to the existing SPICE, VHDL-AMS or Verilog-A based flows and can open the way to true device-level system design exploration and optimization. To the best of the authors' knowledge, this is the first ever paper to explore a Simscapemodel of a GFET device and design a GFET based radio-frequency circuit using Simscape. [ABSTRACT FROM AUTHOR]

Published
2016
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200. Verilog-AMS-PAM

Author

Zheng, Geng, primary, Mohanty, Saraju P., additional, Kougianos, Elias, additional, and Garitselov, Oleg, additional

Published
2012
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