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Analysis and Control of the Vehicle Roll Dynamics Using Sum of Squares Polynomial Approach

Journal of Systems Science & Complexity 2024年

作者： iben ammar imen DOUMIATI Moustapha TALJ Reine CHOKOR Abbas MACHMOUM Mohamed ESEO-IREENA Institut de Recherche en énergie électrique de Nantes Atlantique IREENA UR 4642 37 Boulevard de l’Université-BP406 Sorbonne Universités Université de Technologie de Compiègne CNRS Institut de Recherche en énergie électrique de Nantes Atlantique IREENA UR 4642 37 Boulevard de l’Université-BP 406

The safety of vehicle travel relies on good stability performance, making vehicle motion control a vital technology in vehicles. This paper focuses on investigating the impact of roll control on vehicle performance, particularly in terms of avoiding rollover and ensuring lateral stability. By introducing a feedback roll moment, the roll motion can be effectively controlled. The paper considers two roll reference generators: A static one aimed at zero roll, and a dynamic one based on the vehicle's lateral acceleration. The static roll reference generator enhances stability by employing a fixed reference, particularly beneficial during routine driving conditions. In contrast, the dynamic roll reference generator continually adapts the roll angle reference in response to real-time vehicle dynamics and driving conditions. These proposed reference generators can be paired with varying suspension systems — Static reference could be achieved using semi-active suspensions, while the dynamic one is integrated into advanced active suspension systems, offering heightened adaptability and *** address the roll control objectives, this paper proposes a novel sum of squares(SOS) integral polynomial tracking control. The proposed controller satisfies control bounds and considers control constraints during the design phase. The effectiveness and robustness of the proposed control scheme are evaluated through numerical simulations using a full vehicle nonlinear model in Matlab/Simulink. The results of these simulations are compared to super-twisting sliding mode and Lyapunov-based controllers.

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Techniques of Transmitting Beamforming to Control the Generated Weights

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International Journal of Communications, Network and System Sciences 2010年第7期3卷 612-619页

作者： imen Sfaihi Noureddine Hamdi ammar Bouallegue 不详

In this paper, we consider the limited feedback Transmitting Beamforming for MISO systems. In conventional techniques, all vectors of a large codebook (CB), used for the feedback of the quantized channel state information (CSI), are broadcasted to all users, in a guard period which is followed by data burst periods. Instead of transmitting a high number of codevectors, we thought to divide the CB into several sub-codebooks (SC) and the broadcast would be based on the switch between them. Accordingly, a good performance can be provided while minimizing the required feedback channel capacity applying some proposed techniques such as “the switched Sub Codebook (SSC)” and “the Fairness SSC (FSSC)”. To minimize the quantization error, we propose two other techniques. The first is based on making Transmit SSC vectors controlled by a rotation weight (RW) to obtain almost a zero correlation between the SSC vectors used for the selected spatial channels. The second is based on introducing “the Schmidt algorithm” to construct an orthonormal weights using the generated weights. These two proposed techniques increase the probability of the selection of the worst case user on his best codevector to make zero the angle between his couple codevector and channel response. To analyze and validate the performance of these proposed techniques, simulation results are presented.

关键词： MISO Beamforming Limited Feedback CSI SSC FSSC RW-FSSC SSC-Schmidt Algorithm

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Yolk Sac Tumor and Fanconi Anemia: Case Report

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Journal of Cancer Therapy 2021年第10期12卷 585-592页

作者： Chabchoub imen Sboui Hiba ammar Nouha Ben Abdeljalil Nouha Hochlef Makrem Belhassen Samia Zrig Ahmed Zakhama Abdelfattah Chabchoub Elyes Ben Ahmed Slim Department of Medical Onocology Faculty of Medecine Sousse University Hospital Farhat Hached Sousse Tunisia Department of Anathomopathology Faculty of Medecine Monastir University Hospital Fatouma Bourguiba Monastir Tunisia Department of Pediatric Surgery Faculty of Medecine Monastir University Hospital Fatouma Bourguiba Monastir Tunisia Department of Radiology Faculty of Medecine Monastir University Hospital Fatouma Bourguiba Monastir Tunisia Department of Genetics Faculty of Medecine Sousse University Hospital Farhat Hached Sousse Tunisia

Yolk sac tumor (YST), which most frequently arises in the gonads as a type of germ cell tumor, is rare in children but is highly malignant. The common age group affected by yolk sac tumours is 11 to 24 years. In this study, we described a rare case of YST in terms of the clinical manifestation, imaging, and histopathology findings, diagnosis and treatment in a 12-year-old girl who was followed since birth for Fanconi-like syndrome. This is a rare clinical association that also limits chemotherapy.

关键词： Alpha-Fetoprotein Chemotherapy Yolk Sac Tumor Pediatric Surgery Fan-coni-Like Syndrome

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