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Wissenschaftliche Verlagsgesellschaft
Optik

Wissenschaftliche Verlagsgesellschaft

0030-4026

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    A novel security and authentication method for infrared medical image with discrete time chaotic systems

    Boyraz O.F.Guleryuz E.Akgul A.Kiran H.E....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHObjective: Hand vein images have become important biometric signs used for identification systems. Also, dorsal hand vein images have noteworthy advantages in terms of reliability and contactless procedure. Surgically changing the vascular pattern under the skin is extremely difficult. Therefore, the use of such patterns in identity recognition applications is increasing day by day. In this context, many studies have been carried out in essential areas such as image acquisition for different textures, image preprocessing, data security, image feature extraction and recognition. Methods: In this article, a new dorsal hand vein identification application has been carried out with the chaos-based security mechanism to protect personal data and the Improved SURF method to reduce the error matches of traditional SURF method in the current application. There are two improvements in the presented system. The first one finds the features representing only the vein segments, not the remaining tissue or hairly parts. The second one eliminates the mismatching points to increase the accuracy. Results: Both encryption and data hiding techniques are preferred together to protect person data. In addition, dorsal hand vein images taken with a camera for matching and recorded in the database of the people have been improved with the newly developed I-SURF feature extraction method. Thereby, with the developed application, in addition to keeping the personal identity information securely in the database with chaos-based methods, higher accuracy rate has been achieved in matching the new image taken with the camera.
      原文链接:
    • NSTL
    • Elsevier

    Transmission factors, mechanical, and gamma ray attenuation properties of barium-phosphate-tungsten glasses: Incorporation impact of WO3

    Elshami W.ALMisned G.Rammah Y.S.Ahmed E.M....
    5页
    查看更多>>摘要：? 2022 The AuthorsThe purpose of this study is to conduct a thorough examination of the direct and indirect impacts of increasing the quantity of heavy WO3 on gamma-ray transmission, shielding and mechanical properties for some selected barium-phosphate-tungsten glasses. Accordingly, mechanical properties of barium-phosphate-tungsten oxides with chemical formula (50-x)P2O5-50BaO-xWO3 (x = 0.0(S1), 5.0(S2), 10(S3), and 15(S4)) mol% was evaluated using Makishima-Mackenzie model. Next, newly online Phy-X/PSD software and Monte Carlo code were used to examine the gamma radiation characteristics. Gamma-ray transmission factor (TF) values were calculated for S1, S2, S3 and, S4 glass samples for a range of well-known radioisotope energies such for 67Ga, 57Co-57, 111In-111, 133Ba, 201Tl, 99 mTc, 51Cr, 131I, 58Co, 137Cs, 60Co. The total packing density (Vt) was enhanced from 0.589 for S1 glass sample (free with WO3) to 0.605 for S4 glass sample (with highest WO3 =15 mol%). The total energy dissociation (Gt) of the investigated glasses was increased with increasing the WO3 content: from 51.7 (kJ/cm3) for S1 glasses to 52.45 (kJ/cm3) for S4 glasses. All mechanical moduli were improved with increasing the tungsten trioxide concentration in the studied glasses. Poisson's ratios were increased with increasing the WO3 concentration. The trend of linear (LAC) and mass attenuation (MAC) coefficients were followed as: (LAC, MAC) S1 < (LAC, MAC) S2 < (LAC, MAC) S3 < (LAC, MAC) S4. Half (HVL) and tenth (TVL) value layers have the trend as (HVL, TVL) S1 > (HVL, TVL) S2 > (HVL, TVL) S3 > (HVL, TVL) S4. The effective atomic number (Zeff) and electron density (Neff) have the same trend. The lowest transmission Factor (TF) values for all glass specimens were examined at a thickness of 3 cm. Furthermore, the S4 sample displayed the least transmission tendency across all glass thicknesses evaluated.
      原文链接:
    • NSTL
    • Elsevier

    Simulation study to improve the sensitivity of surface plasmon resonance sensor by using ferric oxide, nickel and antimonene nanomaterials

    Singh S.Agarwal S.Dwivedi D.K.Sharma A.K....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHIn the present paper, a simulation work has been done to study about a hypersensitive Surface Plasmon Resonance (SPR) based sensor device created by the angular interrogation method based on Attenuated Total Reflection (ATR) phenomenon. The numerical analysis has been done by the method of transfer matrix and a plane polarised source of light of wavelength 633 nm approx (632.8 nm wavelength of He-Ne laser) has been used. In this device configuration, glass prism of Calcium fluoride (CaF2) has been used with Silver (Ag) metal using Kretschmann configuration, a diamagnetic material nanosheets of ferric oxide (Fe2O3), nickel (Ni) and a 2D material antimonene is used as a polymeric structure. All the important performing parameters of SPR sensor such as sensitivity, detection accuracy, quality factor has been calculated for different device configuration of SPR sensor. Fe2O3 and Ag layer thickness has been optimized by using genetic algorithms to obtain the highest sensitivity. The configuration gives the highest sensitivity 310°RIU?1 of projected SPR sensor when sensing medium RI varies from 1.330 to 1.335. For proposed design of SPR sensor the sensitivity and FWHM are high as compared to the conventional SPR senor having FWHM value 3.4995 (deg.). For the proposed device configuration bilayer of Ni and antimonene has been used as a polymeric substance to improve the sensitivity and protect device from corrosion. Penetration depth value of 110.5 nm and 3D plot of transverse electric (TM) field intensity has also been plotted. The numerical simulation is based on transfer matrix method and Fresnel equations and the used softwares are MATLAB and COMSOL multiphysics software. The proposed SPR sensor helps to detect the liquid analytes in the field of biomedical and environmental application.
      原文链接:
    • NSTL
    • Elsevier

    An asymmetric image encryption scheme based on hash SHA-3, RSA and compressive sensing

    Ye G.Chen Z.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHObjective: In order to avoid the unauthorized access to private images and make a secure communication, an asymmetric image encryption algorithm based on SHA-3 and compressive sensing is proposed. Methods: Firstly, a random matrix is generated and a modular-addition operation is performed between it with the plain image, obtaining a preprocessed image. Then, hash values of the preprocessed image are computed by secure hash algorithm in the third generation (SHA-3), and are grouped and summed to get three plaintext keys. Using Rivest-Shamir-Adleman (RSA), three ciphertext keys can be obtained correspondingly. Secondly, a new mathematical transformation model (MTM) is designed to transform all keys into initial values for chaotic system. Then, keystream is calculated accordingly. Thirdly, the plain image is compressed by compressive sensing (CS), and further confused by random sequences. Then, applying discrete wavelet transformation (DWT) to the confused image and generating four components of high and low frequencies. Chaotic sequences are used again to confuse the low frequency components, and then all components are recombined again into a matrix. Thereafter, perform inverse DWT (IDWT) to get a middle cipher image (MCI). Finally, another random matrix is generated by chaotic sequences, and the final cipher image is obtained by a modular-addition operation again to the MCI. Results: Experiments show that the proposed scheme can reconstruct the plain image with a high quality. In particular, the proposed method can resist known plaintext attack and chosen plaintext attack because the keystreams are related to the plain image and with no extra transmission.
      原文链接:
    • NSTL
    • Elsevier

    Cryptanalysis of encryption scheme based on compound coupled logistic map and anti-codifying technique for secure data transmission

    Munir N.Khan M.Alanazi A.S.Hussain I....
    5页
    查看更多>>摘要：? 2022The aim of this article is to provide cryptanalysis of chaos-based technique based on anti-codifying mechanism. The use of chaos in information security is deemed a secure trace of randomness. Many cryptosystems offer robust security against classical attacks having vulnerability in their structure. Recently, a compound coupled logistic chaotic map-based image encryption scheme was suggested. The encryption structure reveals some security flaws in the implementation. The original model includes input-independent swapping and substitution-based operations. In this work, we have intended a chosen-plaintext attack on a recently offered cryptosystem and suggested an anti-codifying technique for secure data transmission. The simulation and experimental outcomes reveal that the improvement suggestions can resist classical attacks.
      原文链接:
    • NSTL
    • Elsevier

    A multi-objective natural aggregation algorithm for optimizing user allocation matrix in visible light communication

    J A.Nanda S.J.Maddila R.K.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHAllocating users to LED panels in a visible light communication (VLC) environment is a non-convex multi-objective constrained optimization problem. The computational complexity and accuracy of the optimization are the key factors to deal with in a VLC environment. In this manuscript, initially the user allocation problem is formulated as a single objective optimization problem by using sum-utility function of data rate and blockage probability. Then these two contradictory objective functions are simultaneously optimized by a new multi-objective natural aggregation algorithm (MONAA). This proposed algorithm is inspired by the aggregation behavior of cockroaches which help them to determine the darkest spot in a search space. The performance of this multi-objective algorithm is compared with NSGA-II, MOPSO, MOEA/D and MOSOS on eight unconstrained and six constrained mathematical function optimizations. In single objective and multi-objective cases, superior performance is demonstrated by the natural aggregation algorithm for solving the user allocation matrix optimization.
      原文链接:
    • NSTL
    • Elsevier

    Efficiency enhancement of Cd-free buffer layers on CIGS solar cell performance using WxAMPS

    Garadi A.Beloufa A.Bensaad Z.Bensaad A....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHIn this paper, the impact of three buffers structures layers on the CIGS solar cell performance was numerically investigated using the one-dimensional simulation program wxAMPS. For Cd-free buffer layers, ZnS,μc_3C_SiC and Mg0.19Zn0.81O have been proposed as alternative buffers layers materials to replace the currently toxic CdS material used for the CIGS solar cells. A scrupulous optimization strategy based on the performance analysis of the thickness and doping concentration density effects was applied to each layer of the proposed stack solar cell structure ZnO/ Buffer layer/ CIGS. Moreover, the impact of the series resistance (Rs) was also examined and taken into account in the optimization process. As known, the combination of the parameter optimization (doping concentration density, thickness) with the lowest series resistance provides a minimum loss resistivity and high optical throughput. Consequently, the maximum achieved conversion efficiencies values for the three investigated solar cell structures (ZnS, μc_3C_SiC and Mg0.19Zn0.81O) were 31.16%,30.42% and 27.52%, respectively. The optimum value of 2μm was selected for the CIGS thickness while for the CIGS doping concentration density, the optimum values chosen were: 5×1018cm?3,3×1019cm?3 and 1×1018cm?3, respectively. These efficiencies parameters were obtained with a thickness absorber of 2μm, a buffer thickness layer of 40nm, and a ZnO window layer of 20nm.
      原文链接:
    • NSTL
    • Elsevier

    A novel signal conditioning and isolation technique for efficiency enhancement of passive infrared sensor for smart applications

    Kaler R.S.Singh M.Verma M.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHPassive infrared sensor systems are majorly deployed in smart applications. System efficiency is a critical parameter for the better and optimum functioning of the sensor system. This paper, proposes an innovative Signal Conditioning and Isolation technique to effectively analyze the power of the system and further, improving the efficiency of PIR sensor. Signal conditioning leads to achieving desirable output signal for several applications. We have numerically stimulated the mathematical model, investigating current flow, voltage and power of the system. The model also helps to filter out all the low and high frequency disturbances occurring in the system. Simulation results are obtained from the given parameter, enhancing the efficiency of the system to 95%.
      原文链接:
    • NSTL
    • Elsevier

    16.35 % efficient Cs2GeSnCl6 based heterojunction solar cell with hole-blocking SnO2 layer: DFT and SCAPS-1D simulation

    Sk M.Ghosh S.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHCs2GeSnCl6 is predicted to be an emerging material for the construction of high-efficiency solar cells. In this article, we have explored the structural, optoelectronic and photovoltaic properties of Cs2GeSnCl6 by using first-principles and SCAPS-1D simulations. The formation energy and phonon band structure calculations confirmed the thermodynamic stability of Cs2GeSnCl6. The electronic property of Cs2GeSnCl6 revealed a direct band gap of 0.91 eV (with SOC) by using the mBJ exchange-correlation functional. The optical calculations ensured a high absorption coefficient and low reflectance. Furthermore, the simulated photovoltaic performance of Cs2GeSnCl6-based heterojunction solar cell i.e. ITO/SnO2/ Cs2GeSnCl6/Au shows the optimum PCE (%) of 16.35 %, which is higher than the recently predicted PEC (%) value from Cs2AgBiBr6 based solar cell.
      原文链接:
    • NSTL
    • Elsevier

    Exact solutions of the linear and nonlinear Schr?dinger equations with variable coefficients

    Dai J.Liu Y.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHThis paper studies exact solutions for the (2+1)-dimensional nonlinear Schr?dinger equation with variable coefficients. First, after a transformation, the linear equation is attribute to the Hukuhara equation and then it is solved by the similarity construction method. Then, the bright and dark soliton and exact solutions for the above nonlinear equation are obtained. Finally, the graphs of these exact solutions to the linear and nonlinear equations with k=1,2 are drew, respectively, which reveals that the essential profile of solutions to the nonlinear Schr?dinger equation with variable coefficients is determined by the corresponding linear equation.
      原文链接:
    • NSTL
    • Elsevier