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This paper presents an effective approach to stabilize nonlinear multiple time-delay (NMTD) interconnected systems via a composite of fuzzy controllers and dithers. First, a neural-network (NN) model is employed to approximate each subsystem. Then, the dynamics of the NN model is converted into a linear differential inclusion (LDI) state-space representation. Next, in terms of Lyapunov?s direct method, a delay-dependent stability criterion is derived to guarantee the exponential stability of the NMTD interconnected system. Subsequently, the stability conditions of this criterion are reformulated into a linear matrix inequality (LMI). Based on the LMI, a robustness design of fuzzy control is synthesized not only to stabilize the NMTD interconnected system but also to achieve the optimal H∞ performance by minimizing the disturbance attenuation level. A set of high-frequency signals (commonly referred to as dithers) is simultaneously injected to stabilize the NMTD interconnected system when the designed fuzzy controllers cannot stabilize it. If the dithers’ frequencies are high enough, the outputs of the dithered interconnected system and those of its corresponding mathematical model, the relaxed interconnected system, can be made as close as desired. This makes it possible to get a rigorous prediction of the stability of the dithered interconnected system by establishing the stability of the relaxed interconnected system. Finally, a numerical example with simulations is given to illustrate the feasibility of our approach. 相似文献
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Feng-Hsiag Hsiao 《Journal of The Franklin Institute》2012,349(5):1828-1850
This paper is concerned with the stability problem of nonlinear multiple time-delay singularly perturbed (NDSP) systems. To overcome the effect of modeling error between the reduced-order model of the NDSP plant and Takagi–Sugeno (T–S) fuzzy models, a robustness design of model-based fuzzy control is proposed in this study. A stability criterion in terms of Lyapunov’s direct method is derived to guarantee the asymptotic stability of NDSP systems. According to this criterion, a model-based fuzzy controller is then synthesized via the technique of parallel distributed compensation (PDC) to stabilize the NDSP system. If the designed fuzzy controller cannot stabilize the NDSP system, a high-frequency signal, commonly referred to as dither, is simultaneously introduced to stabilize it. Based on the relaxed method, the NDSP system can be stabilized by regulating appropriately the parameters of dither. If the dither’s frequency is high enough, the output of the dithered reduced system and that of its corresponding mathematical model – the relaxed reduced system – can be made as close as desired. This makes it possible to obtain a rigorous prediction of the stability of the dithered reduced system based on the one of the relaxed reduced system. 相似文献
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In this paper, the linear-quadratic-Gaussian (LQG) optimal control problem is considered and a robust minimax controller composed of the Kalman filter and the optimal regulator is synthesized to guarantee the asymptotic stability of the discrete time-delay systems under both parametric uncertainties and uncertain noise covariances. Designed procedures are finally elaborated with an illustrative example. 相似文献
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Factors influencing university teachers’ use of a mobile technology-enhanced teaching (MTT) platform
Tang Kai-Yu Hsiao Chun-Hua Tu Yun-Fang Hwang Gwo-Jen Wang Youmei 《Educational technology research and development : ETR & D》2021,69(5):2705-2728
Educational technology research and development - The main purpose of this study was to examine the critical factors influencing university teachers’ use of a mobile technology-enhanced... 相似文献
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Abstract The term guomin is found in Chinese texts from an early period. However, as commonly used today – as a modern political concept of special value and significance – guomin belongs to a political vocabulary adopted by Chinese intellectuals in the late nineteenth and early twentieth centuries from Japan’s new usages. The goal of this essay is to explain how this important concept was formed and what it signified. The term guomin has basically conveyed two levels of meaning since the late Qing. In essence, the term is similar to the English word ‘citizenship’, and it reveals a kind of awakening of a new political consciousness on the part of Chinese intellectuals since the late Qing. Through the discourse of guomin, they began to emphasize the subjectivity of each individual in the national political process, along with all of their rights and duties. Since the beginning of the twentieth century, the criticisms and reflections of Chinese intellectuals about traditional politics, society and culture, and thought have basically developed along the lines of the logic of ‘turning subjects into citizens’. However, the pursuit of a strong nation‐state under a civil crisis sparked by foreign pressure marked the historical conditions that generated the modern Chinese guomin discourse. Limited by this kind of ‘national identity,’ the discourse and construction of guomin since the late Qing have never been able to escape the shadow of the state. Under these ideological conditions, guomin could only become a means of the nationalist project for survival; it could never become an autonomous and universal category. Guomin, as it turns out, has been, and still remains, ‘the people of the state’. 相似文献
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Hsiao‐hung Chang 《Inter-Asia Cultural Studies》2013,14(2):222-236
This essay attempts to map out the global networking of counter‐feit production and consumption by considering the historical and economic complications of fake superlogograms in Taiwan, Hong Kong and Mainland China as a point of departure. It traces not only the ‘capital logic’ of the counter‐feiting industry, which duplicates the international division of labour, but also its ‘cultural logic’, which creates the Euro‐American superlogograms under the spell of Western imperialist ideology. The essay is divided into three main parts to foreground the ‘glocal’ circulation of fake superlogos. The first part considers the famous French Louis Vuitton as a case study to explore the economic, historic and cultural formation of the logomania in East Asia piloted by Japan in the 1980s. The second part discusses the double cultural reproduction of fake logos in Taiwan as both an imitation of Japan and an imitation of Japanese imitation of Europe. The third part seeks to theorize the fake under the context of Asian consumption of the superlogo and to foreground further the historical change of how the ‘fake’ becomes ubiquitous, how the ‘fake’ could be produced out of no originals, and how the ‘fake’ turns out to be perfectly indistinguishable and doubly authentic, which could rewrite the whole theory of mimesis. A new theorization of ‘fake dissemination’ is attempted in this essay to map out the co‐dependent ongoing (de)construction between ‘fake globalization’ and ‘globalization.’ What we mean by ‘fake’ here is no longer the mere difference between real/fake; the ‘fake’ in ‘fake globalization’ means ‘counter‐feiting’ as well as ‘appropriating’. (In Chinese, ‘Jia’ means both ‘fake’ and ‘by a particular means’.) That is, counter‐feit products appropriate the power of globalization to disseminate themselves. ‘Fake globalization’ is the ‘dark flow’ within globalization; it counter‐feits and appropriates globalization, repetitively reduplicating and deconstructing it. ‘Fake globalization’ and ‘globalization’ are not a pair in binary opposition. ‘Fake globalization’ is the ‘subversion’ of global capitalism; it is subject to global superlogo fashion consciousness and simultaneously resistant to the manipulation of ‘glogocentrism’. This subversive fake globalization is different from the traditional anti‐globalization movement, which tends to highlight the protection of international worker's rights, anti‐monopoly and anti‐sweatshops, for the latter focuses chiefly on the ‘oppositional’ stance while the former stresses more the ‘reverse’ side of it. Fake globalization helps to turn globalization itself inside out and outside in. Fake globalization is not an external attack on globalization from without, but an internal exposure of how the historical and psychic formulations of the logics of global capitalism are subject to the cultural imagination under (western) imperialist ideology, and how they are influenced by the political‐economic deployment of international divisions of labour. What fake dissemination does is to expose from within the possibility and impossibility of ‘glogocentrism.’ 相似文献
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Timothy Hsiao 《Academic Questions》2018,31(4):466-471
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There is a lack of research in the area of the influence that task autonomy (TA), organizational learning (OL), and group cohesiveness (GC) can have on technical education teachers' innovation of professional development (IOPD). Therefore, this study aimed to probe into the influences of TA, OL, and GC on IOPD by technical education teachers, and their relationships. We conducted a questionnaire survey on 265 full-time teachers. The results showed that TA, GC, and OL of technical education teachers revealed significant positive relationships with the degree of IOPD. The teachers' TA and OL are critical factors to their IOPD, as they are positive predictors. 相似文献