Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： A new imidazoline inhibitor was synthesized using 1-methylimidazole, 1,4-butane sultone and concentrated sulfuric acid as raw materials and then of which the corrosion inhibition on X100 pipeline steel in 5%HCl was examined by means of weight loss method and electrochemical technology. The results showed that the inhibitor is a mixed type inhibitor. The inhibition efficiency increased with the increasing inhibitor concentration, while decreased with the increase of temperature. The activation energy of corrosion and the relevant thermodynamic parameters such as enthalpy, entropy, adsorption equilibrium constants and standard free energy ect were acquired so that to reveal the mechanism of corrosion inhibition. The results showed that the corrosion inhibitor was physically adsorbed on the X100 steel surface.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2019-05-10 Cooperative journals: 《计算机应用研究》
Abstract： Aiming at the contradiction between improving the embedded quantity and enhancing the robustness in the information hiding algorithm, this paper proposed a multi-carrier information hiding algorithm. The algorithm used multiple facial expression images as vectors, and applied local binary pattern (LBP) texture features to recognize facial expression regions to embed encrypted information. Calculating the adjacent pixel difference matrix of the carrier region, and constructing the embedded space by shifting the histogram of the corresponding element of the difference matrix , in order to realize the reversible concealment of the encrypted information and the lossless recovery of the carrier images. Algorithm analysis proves that it has greater embedding capacity and maintains higher robustness than existing algorithms. Its largest embedded capacity reaches 0.561 at same time the peak signal to noise ratio (PSNR) is 38.421dB. And the value of embedded region PSNR in the paper. reaches 46.286. The robustness experiments show that the proposed algorithm may have a similarity greater than 99% to the original information image for the filtering attack. In the face of shear and translation attacks, the minimum image normalization coefficient (NC) is 0.743 and 0.728, which is much larger than other algorithms. From the comparison experimental results with other algorithms, the proposed algorithm is effective.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-12-13 Cooperative journals: 《计算机应用研究》
Abstract： Aiming at the shortcomings of the traditional 3D model information hiding technology, a novel algorithm based on obj 3D model redundant texture is proposed. First, the feasibility of the texture mapping rule of the orthogonal projection to perform the patch map was verified. Second, the model quaternion wavelet transform space with surface color attributes was constructed, and the key information to be transmitted for encryption was selected. Last, the secret message was embedded into the robust transform space to generate the stego obj model, and the texture and state information was saved into MTL. Additionally, the encrypted model file encryption process was performed by RSA programming means. Simulation experiments show that the proposed algorithm has strong anti-attack capability in special rendering environment compared with 3D model watermarking and steganography without surface mapping properties.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-08-13 Cooperative journals: 《计算机应用研究》
Abstract： Aiming at inferior anti-analysis of current information hiding algorithm, this paper proposed a zero-low-frequency information hiding algorithm based on local BRISK feature. . First, it carried out first-order CL multi-wavelet transform for carrier image. then extracted BRISK feature points in the low-frequency LL2 to generate an image feature matrix; Second, Using zig-zag scrambling and logistic chaos scrambling for the secret image to decorrelate; Again, associated the image feature with the encrypted information to form an association sequence by comparing feature values; Last, it would embed association sequence into lower three bits of high-frequency HL2 and HH2. The association information constructed by eigenmatrix of high energy region and encrypted information of two times was hidden in the high frequency region, which was beneficial to the robustness and anti-analysis of algorithm. Under the analysis of high-order statistics on 200 pictures, the maximum detection rate was less than 7.516%, which indicates that the proposed algorithm has good anti-analysis ability.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-18 Cooperative journals: 《计算机应用研究》
Abstract： In order to improve the statistical properties of multipath fading and more accurate description of wireless channel. This paper proposed an improved simulation model based on Monte Carlo method (MCM) for uncorrelated multiple Rayleigh fading channels. Based on the angle of arrival (AOA) , the multipath element (k) is introduced into the new simulation model, which improved the爉ethod of evaluating AOA. Through the simulation analysis of the channel model parameters AOA, k, the number of low frequency oscillator and the mean square error (MSE) , the results show that a pretty good agreement statistical property of the new model and those of the underlying reference model has been observed. Compared with MCM, the new model has a significant improvement in the autocorrelation properties in the same conditions and the MSE is about a quarter of the original. The new method is useful for the design of wireless channel simulator, frequency-selective channel.
Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-04-12 Cooperative journals: 《计算机应用研究》
Abstract： For the secure transmission of confidential information, this proposed an information hiding algorithm. Using chaos scrambling transform and run-length code compression simultaneously in the secret information preprocessing, in order to improve the embedding capacity and robustness of the stego. In order to achieve the lossless hiding and improve the capacity, it used the histogram-shift technology and the AMBTC (Absolute Moment Block Truncating Coding) to hide the preprocessed secret information in high and low mean value sequence, and the capacity was larger than that of the algorithm which is only based on the AMBTC. The experimental results show that the extracted secret information can be highly identified even after some attacks, and the normalization coefficient is always lager than 0.6, which proves the advantages of the proposed algorithm in terms of robustness and hiding efficiency. Therefore, the method of information hiding in this paper achieves the goal of secure transmission of secret information and has good anti-aggression.
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