This paper would analyze the current situation and put out the suggestions to the current development of the CPA Profession in China. The current situation： market segmentation, interruption by administration; workin...This paper would analyze the current situation and put out the suggestions to the current development of the CPA Profession in China. The current situation： market segmentation, interruption by administration; working under beneficially and violating rules when auditing; lack of rules, self-contradict in system; self-discipline is not strict, sanction is not effective. The Suggestions： reducing the administration interruption, and emphasizing the macro view of supervision and controlling; establishing a sound quality controlling system, and emphasizing the risk mechanism; perfecting the laws and regulations, carrying out the auditing profession according to laws; accelerating the development of the profession and emphasizing the profession standard.展开更多
This paper aims to propose a switching rule to improve the efficiency and stability of the mode switching process for the drag-free satellite.The switching rules will ensure the stability of the different controllers ...This paper aims to propose a switching rule to improve the efficiency and stability of the mode switching process for the drag-free satellite.The switching rules will ensure the stability of the different controllers during the switching process.Unlike traditional satellite switching control,the inner loop and the outer loop of the drag-free satellite are strongly coupled.The drag-free satellite not only needs to consider the controller design in the inner loop but also the controller design of the outer loop.In the outer loop,a Proportion Integration Differentiation control method is adopted to design the controller.In the inner loop,considering the release error effect of the test mass,a nonlinear sliding-mode control is employed as a controller before the mode switch.The H∞mixed-sensitivity controller,to improve the robustness of the system and solve the problem of controller saturation,is designed after the mode switch.In the stability analysis of the switching system,the piecewise continuous Lyapunov function method is adopted.The region of attraction,which is used as the switching rule,is calculated based on the sum of squares.The obtained results demonstrate that the proposed switching rule satisfies the control accuracy and system stability.展开更多
文摘This paper would analyze the current situation and put out the suggestions to the current development of the CPA Profession in China. The current situation： market segmentation, interruption by administration; working under beneficially and violating rules when auditing; lack of rules, self-contradict in system; self-discipline is not strict, sanction is not effective. The Suggestions： reducing the administration interruption, and emphasizing the macro view of supervision and controlling; establishing a sound quality controlling system, and emphasizing the risk mechanism; perfecting the laws and regulations, carrying out the auditing profession according to laws; accelerating the development of the profession and emphasizing the profession standard.
基金supported by the National Natural Science Foundation of China(Grant No.12202281)the Shanghai Natural Science Foundation(Grant No.23ZR1461800)+1 种基金the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2019B030302001)the National Key Research and Development Program(Grant No.2022YFC2204200).
文摘This paper aims to propose a switching rule to improve the efficiency and stability of the mode switching process for the drag-free satellite.The switching rules will ensure the stability of the different controllers during the switching process.Unlike traditional satellite switching control,the inner loop and the outer loop of the drag-free satellite are strongly coupled.The drag-free satellite not only needs to consider the controller design in the inner loop but also the controller design of the outer loop.In the outer loop,a Proportion Integration Differentiation control method is adopted to design the controller.In the inner loop,considering the release error effect of the test mass,a nonlinear sliding-mode control is employed as a controller before the mode switch.The H∞mixed-sensitivity controller,to improve the robustness of the system and solve the problem of controller saturation,is designed after the mode switch.In the stability analysis of the switching system,the piecewise continuous Lyapunov function method is adopted.The region of attraction,which is used as the switching rule,is calculated based on the sum of squares.The obtained results demonstrate that the proposed switching rule satisfies the control accuracy and system stability.
