Forthcoming and Online First Articles

International Journal of Critical Computer-Based Systems

International Journal of Critical Computer-Based Systems (IJCCBS)

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International Journal of Critical Computer-Based Systems (2 papers in press)

Regular Issues

  • An Enhanced Digital Image Watermarking Technique using DWT-HD-SVD and Deep Convolutional Neural Network   Order a copy of this article
    by Manish Rai, Sachin Goyal, Mahesh Pawar 
    Abstract: This paper proposes a novel image watermarking model, which combines discrete wavelet transform (DWT), Hessenberg decomposition (HD), singular value decomposition (SVD)-based deep convolutional neural networks (D-CNN) technique to explore the subjective and objective quality of the images. Initially, the source and cover image are preprocessed using random sampling techniques. During the process of embedding a watermark image, the cover image is decomposed into a number of sub-bands using the DWT process and the resulting coefficients are fed into the HD process. In continuation to it, the source image is operated on the SVD simultaneously and finally, the cover image is embedded into the source image by the attack-defending process. The probability of data loss during the watermarking extraction process and this issue is postulated by the D-CNN technique that explores the denoising process on the extracted watermarked images. The experimental results show that the proposed method has a good trade-off between robustness and invisibility even for the watermarks with multiple sizes.
    Keywords: watermarking; discrete wavelet transform; DWT; singular value decomposition; SVD; deep convolutional neural networks; D-CNN; watermarking embedding; extraction process.
    DOI: 10.1504/IJCCBS.2022.10050956
     
  • Task Models for Mixed Criticality Systems - A Review   Order a copy of this article
    by Louella Colaco, Arun S. Nair, Biju Raveendran, Sasikumar Punnekkat 
    Abstract: The past decade has seen tremendous interest in mixed criticality systems research due to its exponential growth with inherent challenges of effective resource utilisation and isolation. The pervasiveness of these systems along with their certification needs, prompt for suitable task models to perform the required analysis. Extensive usage scenarios and strict certification requirements have spawned a broad spectrum of research and evolved into several task models. In this work, a thematic survey of task models for both uni-core and multi-core mixed criticality systems is carried out. The work categorises task models based on attributes such as resources, quality of service, operating system overheads, energy, fault tolerance and parallel processing. After synthesising the state-of-the-art, the work summarises task models by providing a visual aid and a ready reckoner with traceability to mixed criticality challenges. This work serves as a quintessential reference manual for researchers and academicians in the mixed criticality domain.
    Keywords: uni-core mixed criticality systems; multi-core mixed criticality systems; task models for mixed criticality systems.
    DOI: 10.1504/IJCCBS.2022.10053341