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1 – 4 of 4Chengxi Zhang, Hui-Jie Sun, Jin Wu, Zhongyang Fei, Yu Jiang and Guanhua Zhang
This paper aims to study the attitude control problem with mutating orbital rate and actuator fading.
Abstract
Purpose
This paper aims to study the attitude control problem with mutating orbital rate and actuator fading.
Design/methodology/approach
To avoid malicious physical attacks and hide itself, the spacecraft may irregularly switch its orbit altitude within a specific range, which will bring about variations in orbital rate, thereby causing mutations in the attitude dynamics model. The actuator faults will also cause changes in system dynamics. Both factors affect the control performance. First, this paper determines the potential switching orbits. Then under different conditions, design controllers that can accommodate actuator faults according to the statistical law of actuator fading.
Findings
This paper, to the best of the authors’ knowledge, for the first time, introduces the Markovian jump framework to model the possible unexpected mutating of orbital rate and actuator fading of spacecraft and then designs a novel control policy to solve the attitude control problem.
Practical implications
This paper also provides the algorithm design processes in detail. A comparative numerical simulation is given to verify the effectiveness of the proposed algorithm.
Originality/value
This is an early solution for spacecraft attitude control with dynamics model mutations.
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Keywords
By reviewing the related literature on the Jiaoshi Pinren Zhi (JPZ) system, this paper seeks to indicate that the implementation of JPZ not only has led to domestic brain drain…
Abstract
Purpose
By reviewing the related literature on the Jiaoshi Pinren Zhi (JPZ) system, this paper seeks to indicate that the implementation of JPZ not only has led to domestic brain drain and the imbalance of teachers' qualities between different areas and schools, but also has violated children's equal rights to education guaranteed by the Constitution and educational laws in PR China.
Design/methodology/approach
By analysing national policies and laws and some cases, the paper points out that the reforms on teachers' employment causes the imbalance of teachers' qualities between different areas and schools and it is against the principle of children's equal rights to education guaranteed by the Constitution and some educational laws in China.
Findings
Since the late 1980s, many reform initiatives have been launched in the context of the transition from planned economy to market economy in China.
Originality/value
The reforms on the teachers' employment system from “Tongyi Fenpei” (TF, a system of unified placement for all graduates) and the life‐time employment system to JPZ (a free contract employment system) is one of the important reform initiatives.
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Between 1860 and 1945, the Chinese port city of Tianjin was the site of up to nine foreign-controlled concessions, functioning side by side. Rogaski defined it as a…
Abstract
Between 1860 and 1945, the Chinese port city of Tianjin was the site of up to nine foreign-controlled concessions, functioning side by side. Rogaski defined it as a ‘hyper-colony’, a term which reflects Tianjin's socio-political intricacies and the multiple colonial discourses of power and space. This essay focuses on the transformation of the Tianjin cityscape during the last 150 years, and aims at connecting the hyper-colonial socio-spatial forms with the processes of post-colonial identity construction. Tianjin is currently undergoing a massive renovation program: its transmogrifying cityscape unveils multiple layers of ‘globalizing’ spatialities and temporalities, throwing into relief processes of power and capital accumulation, which operate via the urban regeneration's experiment. This study uses an ‘interconnected history’ approach and traces the interweaving ‘worlding’ nodes of today's Tianjin back to the global connections established in the city during the hyper-colonial period. What emerges is Tianjin's simultaneous tendency towards ‘world-class-ness’ and ‘China-class-ness’.
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The purpose of this paper is to explore the origin of the development of insolvency laws in China and Russia and explores the evolving role of the states in the legislative…
Abstract
Purpose
The purpose of this paper is to explore the origin of the development of insolvency laws in China and Russia and explores the evolving role of the states in the legislative process.
Design/methodology/approach
The study is conducted based on the analysis of historical materials and the relevant secondary sources written in Chinese and Russian.
Findings
The paper argues that the development of the insolvency laws in China and Russia underlines the diverging perceptions by the states about the ways to improve economic performance through reforming their respective state enterprise system. On the other hand, the unsatisfactory utilisation of the laws in the these countries revealed the incompleteness of the wider institutional reform that opened up possibilities for predatory exploitations and corruptive practices which in turn upset the market-building in these developing economies.
Originality value
This study highlights that by bring back the state into the analysis, the competing ideas, interests and institutions in the development of insolvency laws can be identified.
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