学位论文简介

In this work, the author proposes design methods for discrete-time integrators and differentiators.

- Firstly, he proposes a closed-form (non-iterative) design method for discrete-time integrators utilizing trigonometric numerical integration rules. The novelty of this method lies on its simplicity, non-iterative nature, while being able to design integrator meeting prescribed design specifications.

- Secondly, he proposes a closed-from design method for discrete-time fractional-order differ-integrators based on continued fraction expansion. The novelty of this method lies in its simplicity, non-iterative nature, yet providing the designer with sufficient room to accommodate a wide variety of applications by just using low-order models. He also proposes efficient ladder structures for the implementation of variable fractional-order differ-integrator (whose order is adjustable), and further extends it to generalized fractional-order differ-integrator whose magnitude and phase responses can be controlled independently.

- Thirdly, he proposes two iterative design methods for discrete-time differentiators, integrators, and fractional-order differ-integrators. The novelty lies in the conjunction of metaheuristic techniques with sensibly formulated optimization problems to yield frequency response of practical importance.

主要学术成果

1. Talal Ahmed Ali Ali, Zhu Xiao, Jingru Sun, Seyedali Mirjalili, Vincent Havyarimana, Hongbo Jiang, Optimal design of IIR wideband digital differentiators and integrators using salp swarm algorithm, Knowledge-Based Systems, Volume 182, 2019, 104834.

2. Talal Ahmed Ali Ali, Zhu Xiao, Seyedali Mirjalili, Vincent Havyarimana, Efficient design of wideband digital fractional order differentiators and integrators using multi-verse optimizer, Applied Soft Computing, Volume 93, 2020, 106340.

3. Talal Ahmed Ali Ali, Zhu Xiao, Hongbo Jiang, Bo Li, A Class of Digital Integrators Based on Trigonometric Quadrature Rules, IEEE Transactions on Industrial Electronics. (under review in R1)

4. Talal Ahmed Ali Ali, Zhu Xiao, Ahmed Jawad Albdairi, Hongbo Jiang, A Closed-form IIR Approximation of Fractional Operator s^v Around A Prescribed Low Frequency, IEEE Signal Processing Letters. (under review)

5. Talal Ahmed Ali Ali, Zhu Xiao, Hongbo Jiang, IIR Ladder Realization of Variable Fractional-Order Differintegrators, IEEE Transactions on Circuits and Systems II: Express Briefs. (under review)

6. Jing Bai, Wei Shi, Zhu Xiao, Amelia C Regan, Talal Ahmed Ali Ali, Yongdong Zhu, Rui Zhang, Licheng Jiao, Hyperspectral image classification based on superpixel feature subdivision and adaptive graph structure, IEEE Transactions on Geoscience and Remote Sensing, vol. 60, Pages 1-15.

7. Jing Bai, Wei Shi, Zhu Xiao, Talal Ahmed Ali Ali, Fawang Ye, Licheng Jiao, Achieving Better Category Separability for Hyperspectral Image Classification: A Spatial–Spectral Approach, IEEE Transactions on Neural Networks and Learning Systems. (early access)

8. Mundher Mohammed Taresh, Ningbo Zhu, Talal Ahmed Ali Ali, Mohammed Alghaili, Asaad Shakir Hameed, Modhi Lafta Mutar, KL-MOB: automated COVID-19 recognition using a novel approach based on image enhancement and a modified MobileNet CNN, PeerJ Computer Science, Volume 7, Pages e69

9. Mundher Mohammed Taresh, Ningbo Zhu, Talal Ahmed Ali Ali, Asaad Shakir Hameed, Modhi Lafta Mutar, Transfer learning to detect covid-19 automatically from x-ray images using convolutional neural networks, International Journal of Biomedical Imaging, vol. 2021, Article ID 8828404, 9 pages, 2021.