Publications by authors named "Nargis Bibi"

8 Publications

  • Page 1 of 1

A novel encryption scheme for high-contrast image data in the Fresnelet domain.

PLoS One 2018 2;13(4):e0194343. Epub 2018 Apr 2.

Department of Engineering Sciences, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Sawabi, 23640, Pakistan.

In this paper, a unique and more distinctive encryption algorithm is proposed. This is based on the complexity of highly nonlinear S box in Flesnelet domain. The nonlinear pattern is transformed further to enhance the confusion in the dummy data using Fresnelet technique. The security level of the encrypted image boosts using the algebra of Galois field in Fresnelet domain. At first level, the Fresnelet transform is used to propagate the given information with desired wavelength at specified distance. It decomposes given secret data into four complex subbands. These complex sub-bands are separated into two components of real subband data and imaginary subband data. At second level, the net subband data, produced at the first level, is deteriorated to non-linear diffused pattern using the unique S-box defined on the Galois field [Formula: see text]. In the diffusion process, the permuted image is substituted via dynamic algebraic S-box substitution. We prove through various analysis techniques that the proposed scheme enhances the cipher security level, extensively.
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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0194343PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5880351PMC
July 2018

Neurochemical Alterations in Sudden Unexplained Perinatal Deaths-A Review.

Front Pediatr 2018 25;6. Epub 2018 Jan 25.

Research Unit, Faculty of Allied Health Sciences, University of Lahore, Lahore, Pakistan.

Sudden unexpected perinatal collapse is a major trauma for the parents of victims. Sudden infant death syndrome (SIDS) is unexpected and mysterious death of an apparently healthy neonate from birth till 1 year of age without any known causes, even after thorough postmortem investigations. However, the incidence of sudden intrauterine unexplained death syndrome (SIUDS) is seven times higher as compared with SIDS. This observation is approximated 40-80%. Stillbirth is defined as death of a fetus after 20th week of gestation or just before delivery at full term without a known reason. Pakistan has the highest burden of stillbirth in the world. This basis of SIDS, SIUDS, and stillbirths eludes specialists. The purpose of this study is to investigate factors behind failure in control of these unexplained deaths and how research may go ahead with improved prospects. Animal models and physiological data demonstrate that sleep, arousal, and cardiorespiratory malfunctioning are abnormal mechanisms in SIUDS risk factors or in newborn children who subsequently die from SIDS. This review focuses on insights in neuropathology and mechanisms of SIDS and SIUDS in terms of different receptors involved in this major perinatal demise. Several studies conducted in the past decade have confirmed neuropathological and neurochemical anomalies related to serotonin transporter, substance P, acetylcholine α7 nicotine receptors, etc., in sudden unexplained fetal and infant deaths. There is need to focus more on research in this area to unveil the major curtain to neuroprotection by underlying mechanisms leading to such deaths.
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http://dx.doi.org/10.3389/fped.2018.00006DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5788892PMC
January 2018

On Forgotten Topological Indices of Some Dendrimers Structure.

Molecules 2017 May 24;22(6). Epub 2017 May 24.

Department of Mathematics, COMSATS Institute of Information Technology, Wah Cantt 47040, Pakistan.

A series of previously conducted experiments pertaining to various chemicals and drugs uncover a natural linkage between the molecular structures and the bio-medical and pharmacological characteristics. The forgotten topological index computed for the molecular structures of various chemical compounds and drugs has proven significant in medical and pharmaceutical fields by predicting biological features of new chemical compounds and drugs. A topological index can be considered as the transformation of chemical structure into a real number. Dendrimers are highly-branched star-shaped macromolecules with nanometer-scale dimensions. Dendrimers are defined by three components: a central core, an interior dendritic structure (the branches), and an exterior surface with functional surface groups. In this paper, we determine forgotten topological indices of poly(propyl) ether imine, porphyrin, and zinc-porphyrin dendrimers.
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http://dx.doi.org/10.3390/molecules22060867DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6152758PMC
May 2017

Reversible integer wavelet transform for blind image hiding method.

PLoS One 2017 12;12(5):e0176979. Epub 2017 May 12.

Department of Electrical Engineering, COMSATS Institute of Information Technology, Wah Cantt., Pakistan.

In this article, a blind data hiding reversible methodology to embed the secret data for hiding purpose into cover image is proposed. The key advantage of this research work is to resolve the privacy and secrecy issues raised during the data transmission over the internet. Firstly, data is decomposed into sub-bands using the integer wavelets. For decomposition, the Fresnelet transform is utilized which encrypts the secret data by choosing a unique key parameter to construct a dummy pattern. The dummy pattern is then embedded into an approximated sub-band of the cover image. Our proposed method reveals high-capacity and great imperceptibility of the secret embedded data. With the utilization of family of integer wavelets, the proposed novel approach becomes more efficient for hiding and retrieving process. It retrieved the secret hidden data from the embedded data blindly, without the requirement of original cover image.
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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0176979PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5428981PMC
September 2017

Equation-Method for correcting clipping errors in OFDM signals.

Springerplus 2016 30;5(1):931. Epub 2016 Jun 30.

Department of Computer Science, The University of Manchester, Manchester, UK.

Orthogonal frequency division multiplexing (OFDM) is the digital modulation technique used by 4G and many other wireless communication systems. OFDM signals have significant amplitude fluctuations resulting in high peak to average power ratios which can make an OFDM transmitter susceptible to non-linear distortion produced by its high power amplifiers (HPA). A simple and popular solution to this problem is to clip the peaks before an OFDM signal is applied to the HPA but this causes in-band distortion and introduces bit-errors at the receiver. In this paper we discuss a novel technique, which we call the Equation-Method, for correcting these errors. The Equation-Method uses the Fast Fourier Transform to create a set of simultaneous equations which, when solved, return the amplitudes of the peaks before they were clipped. We show analytically and through simulations that this method can, correct all clipping errors over a wide range of clipping thresholds. We show that numerical instability can be avoided and new techniques are needed to enable the receiver to differentiate between correctly and incorrectly received frequency-domain constellation symbols.
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http://dx.doi.org/10.1186/s40064-016-2413-0DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4929106PMC
July 2016

Blind data hiding technique using the Fresnelet transform.

Springerplus 2015 30;4:832. Epub 2015 Dec 30.

Department of Applied Mathematics, Hanyang University, Ansan, 426-791 South Korea.

A new blind data hiding scheme is proposed in which data is decomposed using the Fresnelet transform. The inverse Fresnelet transform is performed on decomposed subbands by choosing different key parameters, and the coded pattern of the information data is obtained. This coded pattern is embedded into particular subbands of the cover image using the wavelets. The proposed method has good imperceptibility and large capacity of the information embedded data. Using the Fresnelet transform with a family of wavelet transforms makes the scheme more efficient in terms of extracted accuracy of hidden information. Moreover, the hidden data can be recovered without access to the original cover data. The proposed method is used to resolve privacy and security issues raised with respect to emerging internet applications for the effective handling of confidential data.
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http://dx.doi.org/10.1186/s40064-015-1534-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4695487PMC
January 2016
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