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Prediction of Time Series Empowered with a Novel SREKRLS Algorithm

Computers, Materials & Continua 2021年第5期67卷 1413-1427页

作者： Bilal Shoaib Yasir Javed muhammad Adnan Khan Fahad Ahmad Rizwan Majeed muhammad saqib nawaz muhammad Adeel Ashraf Abid Iqbal muhammad Idrees School of Computer Science Minhaj University LahoreLahore54000Pakistan Prince Sultan University Riyadh11586Saudi Arabia Department of Computer Science Riphah International University Lahore CampusLahore54000Pakistan Department of Basic Sciences Deanship of Common First YearJouf UniversitySakakaAljouf72341Saudi Arabia Directorate of IT The Islamia University of BahawalpurBahawalpur63100Pakistan Department of Computer Science University of Management and TechnologyLahore54770Pakistan PUCIT University of the PunjabLahore54000Pakistan

For the unforced dynamical non-linear state–space model,a new Q1 and efficient square root extended kernel recursive least square estimation algorithm is developed in this *** proposed algorithm lends itself towards the parallel implementation as in the FPGA *** the help of an ortho-normal triangularization method,which relies on numerically stable givens rotation,matrix inversion causes a computational burden,is *** computation possesses many excellent numerical properties such as singularity,symmetry,skew symmetry,and triangularity is achieved by using this *** proposed method is validated for the prediction of stationary and non-stationary Mackey–Glass Time Series,along with that a component in the x-direction of the Lorenz Times Series is also predicted to illustrate its *** the learning curves regarding mean square error(MSE)are witnessed for demonstration with prediction performance of the proposed algorithm from where it’s concluded that the proposed algorithm performs better than *** new SREKRLS based design positively offers an innovative era towards non-linear systolic arrays,which is efficient in developing very-large-scale integration(VLSI)applications with non-linear input *** experiments are carried out to validate the reliability,effectiveness,and applicability of the proposed algorithm and with different noise levels compared to the Extended kernel recursive least-squares(EKRLS)algorithm.

关键词： Kernel methods square root adaptive filtering givens rotation mackey glass time series prediction recursive least squares kernel recursive least squares extended kernel recursive least squares square root extended kernel recursive least squares algorithm

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Effect of Lewis acid-base additive on lead-free Cs_(2)SnI_(6) thin film prepared by direct solution coating process

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Chinese Physics B 2024年第8期33卷 444-451页

作者： saqib nawaz Khan 王燕钟李祥梁会力杜小龙梅增霞 Institute of Physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China University of Chinese Academy of Sciences Beijing 100049China Beijing Hairou Laboratory Beijing 101400China School of Physics Beijing Institute of TechnologyBeijing 100081China

Inorganic Cs_(2)SnI_(6) perovskite has exhibited substantial potential for light harvesting due to its exceptional optoelectronic properties and remarkable stability in ambient *** charge transport characteristics within perovskite films are subject to modulation by various factors,including crystalline orientation,morphology,and crystalline *** preferred crystalline orientation and film morphology via a solution-based process is challenging for Cs_(2)SnI_(6) *** this work,we employed thiourea as an additive to optimize crystal orientation,enhance film morphology,promote crystallization,and achieve phase *** lowers the surface energy of the(222)plane along the(111)direction,confirmed by x-ray diffraction,x-ray photoelectron spectroscopy,ultraviolet photoelectron spectroscopy studies,and density functional theory *** thiourea concentration enables a bandgap tuning of Cs_(2)SnI_(6) from 1.52 eV to1.07 *** approach provides a novel method for utilizing Cs_(2)SnI_(6) films in high-performance optoelectronic devices.

关键词： Cs_(2)SnI_(6) crystalline orientation Lewis acid-case additive engineering bandgap engineering

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Research on Robust Watermarking Method of Digital Image Using SURF and DCT

Research on Robust Watermarking Method of Digital Image Usin...

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作者： nawaz saqib Ali 海南大学

学位级别：硕士

在计算机网络技术、多媒体技术和信息技术的不断发展中,数字化已成为显示信息的主要手段。从而促进了数字多媒体信息的存储,复制和传播。在这种情况下,对数字图像,音乐等的任意编辑,复制,修改和传播没有任何限制,这会导致各种社会问题,... 详细信息

在计算机网络技术、多媒体技术和信息技术的不断发展中,数字化已成为显示信息的主要手段。从而促进了数字多媒体信息的存储,复制和传播。在这种情况下,对数字图像,音乐等的任意编辑,复制,修改和传播没有任何限制,这会导致各种社会问题,例如信息安全,版权纠纷和盗版。随着网络和多媒体的发展,数字水印技术作为一种有效的版权保护方法已受到关注。使用基于图像特征的算法来提高数字水印算法的抗几何攻击能力已受到广泛关注。水印图像的常见攻击可分为常规攻击和几何攻击。常规攻击主要包括高斯滤波,噪声攻击,图像压缩等。几何攻击主要包括旋转,缩放,平移和剪切等操作。数字水印算法的鲁棒性是重要的性能指标。当前的水印算法对几何攻击的抵抗力是一个难以解决的问题。这项研究使用水印技术,将水印信息与宿主图像的特征相关联。所研究的算法具有更好的鲁棒性,尤其是对几何攻击的抵抗力。主要研究内容如下:(1)研究了基于SURF感知哈希和DCT的鲁棒盲水印算法。该算法首先利用仿射变换与特征矩阵结合混沌加密技术对水印图像进行预处理,增强水印的机密性,对载体图像进行分块和DCT系数提取。通过修改DCT系数。完成水印的嵌入。并可以实现水印的盲提取。研究发现,SURF算法对几何攻击具有良好的鲁棒性,但是在感知哈希过程中需要优化特征模块的选择。(2)研究了基于SURF和DCT特征的鲁棒零水印算法,该算法也有助于双水印。首先,将原始图像从RGB空间转换为YUV空间,并提取亮度分量的SURF(加速鲁棒特征)。标记点,根据特征点的主要方向构造一个描述向量,实验结果表明,该算法有较好的鲁棒性。(3)研究了基于SURF和DCT和SVD的鲁棒水印算法。针对数字图像水印算法嵌入容量小,抗几何攻击性弱的问题,提出了一种基于加速鲁棒特征算法(SURF),冗余离散小波变换(RDWT)和奇异值分解(SVD)的数字水印算法。利用SURF算法的旋转不变性和平移不变性提取特征点,并对载波图像和水印图像进行RDWT和SVD变换以及逆变换,以实现水印的嵌入和提取。引入了随机采样一致性算法来优化特征点匹配结果。实验结果表明,该算法提高了嵌入水印的能力,有效提高了抗几何攻击的鲁棒性。

关键词：数字水印医学图像水印 SURF DCT

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Mixed Attention Densely Residual Network for Single Image Super-Resolution

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Computer Systems Science & Engineering 2021年第10期39卷 133-146页

作者： Jingjun Zhou Jing Liu Jingbing Li Mengxing Huang Jieren Cheng Yen-Wei Chen Yingying Xu saqib Ali nawaz School of Information and Communication Engineering Hainan UniversityHaikou570228China State Key Laboratory of Marine Resource Utilization in the South China Sea Hainan UniversityHaikou570228China Research Center for Healthcare Data Science Zhejiang LabHangzhou311121China School of Computer Science and Cyberspace Security Hainan UniversityHaikou570228China Graduate School of Information Science and Engineering Ritsumeikan University5258577Japan College of Computer Science and Technology Zhejiang UniversityHangzhou311100China

Recent applications of convolutional neural networks(CNNs)in single image super-resolution(SISR)have achieved unprecedented ***,existing CNN-based SISR network structure design consider mostly only channel or spatial information,and cannot make full use of both channel and spatial information to improve SISR performance *** present work addresses this problem by proposing a mixed attention densely residual network architecture that can make full and simultaneous use of both channel and spatial ***,we propose a residual in dense network structure composed of dense connections between multiple dense residual groups to form a very deep *** structure allows each dense residual group to apply a local residual skip connection and enables the cascading of multiple residual blocks to reuse previous features.A mixed attention module is inserted into each dense residual group,to enable the algorithm to fuse channel attention with laplacian spatial attention effectively,and thereby more adaptively focus on valuable feature *** qualitative and quantitative results of extensive experiments have demonstrate that the proposed method has a comparable performance with other stateof-the-art methods.

关键词： Channel attention Laplacian spatial attention residual in dense mixed attention

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Highly efficient Cu_(2)ZnSn(S,Se)_(4) bifacial solar cell via a composition gradient strategy through the molecular ink

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Science China Materials 2022年第3期65卷 612-619页

作者： saqib nawaz Khan Sijie Ge Yuxiang Huang Han Xu Wentao Yang Ruijiang Hong Yaohua Mai Ening Gu Xianzhong Lin Guowei Yang Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices State Key Laboratory of Optoelectronic Materials and TechnologiesSchool of Materials Science and EngineeringSun Yat-Sen UniversityGuangzhou 510275China Key Laboratory of Polymeric Composite and Functional Materials of Ministry of Education Sun Yat-Sen UniversityGuangzhou 510275China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Institute of New Energy Technology College of Information and TechnologyJinan UniversityGuangzhou 510632China

The use of transparent conducting oxide(TCO)as a substrate in Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)thin-film solar cells allows for advanced applications,such as bifacial,semitransparent,and tandem solar cells with the capability to increase power density ***,the efficiency of this kind of solar cell is still below 6% based on the low-cost solution *** this work,we develop a composition gradient strategy and demonstrate a 6.82% efficient CZTSSe solar cell on F:SnO_(2)(FTO)substrate under the ambient *** composition gradient is realized by simply depositing the precursor inks with different Zn/Sn *** verify that the high performance of the solar cell is attributed to the composition gradient strategy rather than the sole change of the Zn/Sn ratio,devices based on absorbers with varied Zn/Sn ratios are ***,the structure and surface morphology of the CZTSSe films with/without composition gradients are *** presence of elemental gradient through the depth of the CZTSSe films before and after annealing is confirmed by secondary ion mass spectroscopy *** is found that the composition gradient enhances the crystallinity of the absorber,reduces the surface roughness as well as device parasitic losses,contributing to a higher fill factor,open-circuit voltage,and conversion efficiency.

关键词： Cu_(2)ZnSn(S,Se)_(4) composition gradient bifacial solar cell molecular ink

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CZTSSe薄膜太阳能电池:Zn/Sn比例的优化

CZTSSe薄膜太阳能电池:Zn/Sn比例的优化

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第七届新型太阳能电池材料科学与技术学术研讨会

作者：葛思洁徐菡杨文韬黄宇翔 saqib nawaz Khan 林显忠中山大学聚合物复合材料及功能材料教育部重点实验室材料科学与工程学院

理论计算表明CZTSSe薄膜中与Sn相关的缺陷多为深能级缺陷,不利于载流子的传输,同时该类缺陷的形成能可通过薄膜成分进行调控。在本文中,我们通过调控基于DMF和DMSO混合溶剂的前驱体溶液中Zn/Sn比例(1.0到1.9),研究Zn/Sn比对所得CZTSSe... 详细信息

理论计算表明CZTSSe薄膜中与Sn相关的缺陷多为深能级缺陷,不利于载流子的传输,同时该类缺陷的形成能可通过薄膜成分进行调控。在本文中,我们通过调控基于DMF和DMSO混合溶剂的前驱体溶液中Zn/Sn比例(1.0到1.9),研究Zn/Sn比对所得CZTSSe薄膜的结晶性、电流传输及电池性能的影响。通过SEM观察得到,薄膜结晶性在一定Zn/Sn比例范围内随之增加而提高,晶粒尺寸随Zn/Sn比例的增加而增大,但与此同时薄膜的表面粗糙度也逐渐增大,Zn/Sn比例为1.7时,薄膜表面晶粒开始出现不连续状态;ICP和XPS测试结果表明,即使前驱体薄膜的Zn/Sn高达1.9,退火后薄膜表面Zn/Sn比可自调节到1.05至1.27的范围内;随着Zn/Sn增加,薄膜中会形成ZnSe二次相,存在于薄膜的不同的位置,当其主要覆于薄膜内部晶界时,可促进载流子传输,但当其过多堆积于薄膜表面或底部时,将提高电池串阻,恶化界面接触,阻碍载流子传输。此外,Zn/Sn增加可有效抑制MoSe2层的厚度,进一步优化了背界面接触。更重要的是,当Zn/Sn比例从1.0提高至1.5时,开路电压损失由730mV显著地降至580m,电池的效率也从4.5%提高到了10.0%,并且在较大的Zn/Sn比例范围内仍能保持9%左右的效率,然而Zn/Sn比例增至1.9时,效率下降到4.3%。该工作对今后进一步提高电池性能具有重要的参考意义。

关键词： Zn/Sn CZTSSe薄膜

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