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Your search keyword '"Mao, Zhuang"' showing total 33 results
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33 results on '"Mao, Zhuang"'

16. Amplitude-Dependent Phase-Gradient Directional Beamforming for IRS: A Scalable Optimization Framework

Author

Mao, Zhuang, Wang, Wei, Xia, Qian, Huang, Chongwen, Pan, Xinhua, and Ye, Zhizhen

Abstract

Intelligent reflecting surface (IRS) usually consists of a large number of passive elements, for which the element-grouping strategies can be adopted to group adjacent elements into a sub-surface for lower computational complexity. For the grouped elements of a sub-surface, the linear gradient phase shift configuration can achieve directional IRS reflect beam towards the intended receiver. In this paper, we propose a practical scalable optimization framework for element-grouping IRS by adopting the amplitude-dependent phase-gradient directional beamforming, which induces a new amplitude-phase coupling to the reflected signal. Specifically, by deriving the phase-gradient condition from Fermat’s principle, we propose a practical phase-gradient IRS reflection model. Under this practical model, the amplitude-phase coupling becomes complicated, which brings technical challenges to the IRS beamforming optimization. We study a joint transmit and reflect beamforming optimization problem to minimize the transmit power. By designing a trigonometric transformation to deal with the complicated amplitude-phase coupling, we propose a penalty-based phase control strategy under given element grouping. Subsequently, to solve the element-grouping combinatorial problem with performance guarantee, we propose a low-complexity IRS reflect beamforming algorithm based on Markov approximation. Simulation results demonstrate that the proposed algorithm achieves substantial performance gains compared to conventional schemes.

Published
2024
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21. Clinical Outcomes of MRI-Guided Adaptive Brachytherapy for Each Fraction in Locally Advanced Cervical Cancer: A Single Institution Experience

Author

Chi, Yunbo, Pan, Ying, Zhang, Ning, Han, Dongmei, Guo, Xin, Mao, Zhuang, and Cheng, Guanghui

Subjects
Cancer Research, Oncology
Abstract

PurposeThis study aims to evaluate clinical outcomes of MRI-guided adaptive brachytherapy (MR-IGABT) for each brachytherapy fraction in patients with locally advanced cervical cancer (LACC).Methods and MaterialsA retrospective analysis was performed on 97 consecutive patients with LACC treated with 44.0–50.4 Gy external beam radiotherapy (EBRT) ± concurrent platinum-containing chemotherapy followed by 4 × 7 Gy MR-IGABT between September 2014 and April 2019. Intracavitary (IC)/interstitial (IS)/hybrid intracavitary and interstitial (IC/IS) brachytherapy was used in MR-IGABT. Brachytherapy planning and dose reporting followed the GEC-ESTRO recommendations. Clinical outcomes including overall survival (OS), cancer-specific survival (CSS), progression-free survival (PFS), local control (LC), and treatment-related toxicity evaluated by the RTOG criteria were analyzed. Kaplan–Meier and univariable and multivariable Cox regression analyses were used to analyze the prognostic factor.ResultsMedian follow-up was 21.1 months. Median dose to 90% (D90) of the high-risk clinical target volume (HR-CTV) was 91.7 Gy (range 76.7~107.2 Gy). Two-year OS, CSS, PFS, and LC were 83.5%, 84.1%, 71.1%, and 94.8%, respectively. Four patients (4.1%) suffered from grade 3 late gastrointestinal radiation toxicity, and no other grade 3 or greater radiation toxicity occurred. Initial HR-CTV was an independent factor of OS (p = 0.001, HR = 1.018/cm3), PFS (p = 0.012, HR = 1.012/cm3), and LC (p = 0.011, HR = 1.028/cm3). The HR-CTV D90 (p = 0.044, HR = 0.923/Gy) was an independent factor of PFS. Age was an independent factor of LC (p = 0.010, HR = 1.111/year).ConclusionFor patients with LACC, MR-IGABT was effective and safe. It showed favorable LC, OS, and minimal toxicity. Moreover, initial HR-CTV, HR-CTV D90, and age were significant prognostic factors.

Published
2022

22. Blood cell characterization and transcriptome analysis reveal distinct immune response and host resistance of different ploidy cyprinid fish following Aeromonas hydrophila infection

Author

Xiong, Ning-Xia, primary, Ou, Jie, additional, Fan, Lan-Fen, additional, Kuang, Xu-Ying, additional, Fang, Zi-Xuan, additional, Luo, Sheng-Wei, additional, Mao, Zhuang-Wen, additional, Liu, Shao-Jun, additional, Wang, Shi, additional, Wen, Ming, additional, Luo, Kai-Kun, additional, Hu, Fang-Zhou, additional, Wu, Chang, additional, and Liu, Qing-Feng, additional

Published
2022
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23. Comparative analysis of erythrocyte hemolysis, plasma parameters and metabolic features in red crucian carp (Carassius auratus red var) and triploid hybrid fish following Aeromonas hydrophila challenge

Author

Xiong, Ning-Xia, primary, Luo, Sheng-Wei, additional, Fan, Lan-Fen, additional, Mao, Zhuang-Wen, additional, Luo, Kai-Kun, additional, Liu, Shao-Jun, additional, Wu, Chang, additional, Hu, Fang-Zhou, additional, Wang, Shi, additional, Wen, Ming, additional, and Liu, Qing-Feng, additional

Published
2021
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33. Clinical Application of Ultrasound Guidance for Parametrial Treatment of Advanced Cervical Cancer.

Author

Lin, Yuanqiang, Cheng, Guanghui, Shi, Dan, Li, Hequn, Teng, Dengke, Zhao, Zhipeng, Mao, Zhuang, and Wang, Hui

Subjects
CERVICAL cancer, FALLOPIAN tubes, FETAL ultrasonic imaging, INTRACLASS correlation, MAGNETIC resonance imaging, REGRESSION analysis
Abstract

Objectives: To evaluate the accuracy of ultrasound (US) in determining the positions of parametrial implants by comparing US with magnetic resonance imaging (MRI) for advanced cervical cancer. Methods: Patients undergoing brachytherapy with parametrial implantation for cervical cancer from February 2017 to February 2019 were involved in the study. The transverse section of the cervix (surface S1) and the transverse section 1 cm above the external cervix (surface S2) were selected from MRI and US images as the observation planes. In the MRI observation plane, the distances between the uterine titanium needles and the uterine tube/implanter were set as M1 to M4; in the US observation plane, the distances between the uterine titanium needles and the uterine tube/implanter were set as D1 to D4. The differences and consistency in M and D of each group were then compared. Results: There were no significant differences between M and D in each group (P =.058; P =.821; P =.870; and P =.936, respectively). The intraclass correlation coefficients of M and D in each group were 0.970, 0.968, 0.952, and 0.956. A regression analysis showed that the relationships between M and D in each group were as follows: M1 = 0.9449D1 + 0.1812; M2 = 0.9463D2 + 0.0965; M3 = 0.9176D3 + 0.1233; and M4 = 0.9253D4 + 0.1224. Conclusions: In parametrial brachytherapy for cervical cancer, US can accurately determine the positions of parametrial implantation needles, which is already applicable on MRI, and can provide assistance in parametrial brachytherapy for advanced cervical cancer. [ABSTRACT FROM AUTHOR]

Published
2020
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