11 results on '"Zhuang, Y"'
Search Results
2. Peripheral-coupled-waveguide MQW electroabsorption modulator for near transparency and high spurious free dynamic range RF fiber-optic link
- Author
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Zhuang, Y L and Zhuang, Y L
- Abstract
Peripheral coupled waveguide (PCW) design has been deployed in InGaAsP multiple quantum-well (MQW) electroabsorption modulator (EAM) at 1.55-mum wavelength. PCW enhances the optical saturation power and reduces the optical insertion loss and the equivalent V-pi simultaneously. A radio-frequency link using a 1.3-mm-long lumped-element PCW EAM has achieved experimentally a link gain of -3 dB, at 500 MHz and at input optical power of 80 mW. The corresponding two-tone multioctave spurious-free dynamic range (SFDR) at the same bias is measured at 118 dB (.) Hz(2/3). The single-octave SFDR at the third-order null bias is 132 dB (.) Hz(4/5).
- Published
- 2004
3. Analysis and Synthesis of Distributed Systems
- Author
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Zhuang, Y. and Zhuang, Y.
- Abstract
We first model and analyze distributed systems including distributed sensors and actuators. We then consider identification of distributed systems via adaptive wavelet neural networks (AWNNs) by taking advantage of the multiresolution property of wavelet transforms and the parallel computational structure of neural networks. A new systematic approach is developed in this dissertation to construct an optimal discrete orthonormal wavelet basis with compact support for spanning the subspaces employed for system identification and signal representation. We then apply a backpropagation algorithm to train the network to approximate the system. Filter banks for parameterizing wavelet systems are studied. An analog VLSI implementation architecture of the AWNN is also given in this dissertation. This work is applicable to signal representation and compression under optimal orthonormal wavelet bases in addition to progressive system identification and modeling. We anticipate that this work will find future applications in signal processing and intelligent systems.
- Published
- 1994
4. Optimal Wavelet Basis Selection for Signal Representation
- Author
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Zhuang, Y. and Zhuang, Y.
- Abstract
We study the problem of choosing the optimal wavelet basis with compact support for signal representation and provide a general algorithm for computing the optimal wavelet basis. We first briefly review the multiresolution property of wavelet decomposition and the conditions for generating a basis of compactly supported discrete wavelets in terms of properties of quadrature mirror filter (QMF) banks. We then parametrize the mother wavelet and scaling function through a set of real coefficients. We further introduce the concept of information measure as a distance measure between the signal and its projection onto the subspace spanned by the wavelet basis in which the signal is to be reconstructed. The optimal basis for a given signal is obtained through minimizing this information measure. We have obtained explicitly the sensitivity of dilations and shifts of the mother wavelet with respect to the coefficient set. A systematic approach is developed here to derive the information gradient with respect to the parameter set for a given square integrable signal and the optimal wavelet basis. A gradient based optimazation algorithm is developed in this paper for computing the optimal wavelet basis.
- Published
- 1994
5. Existence and Construction of Optimal Wavelet Basis for Signal Representation
- Author
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Zhuang, Y. and Zhuang, Y.
- Abstract
We study the problem of choosing the optimal wavelet basis with compact support for signal representation and provide a general algorithm for computing the optimal wavelet basis. We first briefly review the multiresolution property of wavelet decomposition and the conditions for generating a basis of compactly supported discrete wavelets in terms of properties of quadrature mirror filter (QMF) banks. We then parametrize the mother wavelet and scaling function through a set of real coefficients. We further introduce the concept of decomposition entropy as an information measure to describe the distance between the given signal and its projection onto the subspace spanned by the wavelet basis in which the signal is to be reconstructed. The optimal basis for a given signal is obtained through minimizing this information measure. We have obtained explicitly the sensitivity of dilations and shifts of the mother wavelet with respect to the coefficient set. A systematic approach is developed in this paper to derive the information gradient with respect to the parameter set from a given square integrable signal and a discrete basis of wavelets. The existence of the optimal basis for the wavelets has been proven in this paper. a gradient based optimization algorithm is developed for computing the optimal wavelet basis.
- Published
- 1994
6. HDTV: Technology Targets and Research Directions
- Author
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Zhuang, Y. and Zhuang, Y.
- Abstract
This paper introduces the principles and architectures of high definition televisions (HDTV) and analyzes the functions of HDTV's digital components. It compares the current analog HDTV systems with the prototypes of digital HDTVs. It then summarizes the latest developments in digital HDTV technologies and identifies current technology targets. Finally, this paper predicts future research directions in digital HDTVs.
- Published
- 1993
7. Consideration on Optimal Design of Distributed Sensors and Actuators Made of Smart Materials for Active Vibration Control
- Author
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Zhuang, Y. and Zhuang, Y.
- Abstract
We describe a design technique for optimal control in active structural vibration damping using smart materials. The vibration of a cantilever beam is stabilized by using distributed sensors and actuators. We model the beam by the Timoshenko beam model together with the distributed sensors and actuators. A control law using the weighted integration of vibration velocity is incorporated in the closed loop system. We propose a method to find the optimal layout design of the smart material so as to maximize the damping effect. An objective functional is defined based on the vibration energy of the system. The optimal shapes of the sensor and actuator are determined through minimizing the energy functional of the beam over the admissible shaped function space subject to certain geometric constraints. An algorithm has been developed to determine the optimal sensor and actuator layout. This method can be generalized to the plate damping problem and more complicated structures as well.
- Published
- 1993
8. Identification of Infinite Dimensional Systems Via Adaptive Wavelet Neural Networks
- Author
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Zhuang, Y. and Zhuang, Y.
- Abstract
We consider identification of distributed systems via adaptive wavelet neural networks (AWNNs). We take advantage of the multiresolution property of wavelet systems and the computational structure of neural networks to approximate the unknown plant successively. A systematic approach is developed in this paper to find the optimal discrete orthonormal wavelet basis with compact support for spanning the subspaces employed for system identification. We then apply backpropagation algorithm to train the network with supervision to emulate the unknown system. This work is applicable to signal representation and compression under the optimal orthonormal wavelet basis in addition to autoregressive system identification and modeling. We anticipate that this work be intuitive for practical applications in the areas of controls and signal processing.
- Published
- 1993
9. Eremitic landscape dwelling in Confucian China and Enlightenment Europe : structuring the moral self in reclusion and performing public duty
- Author
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Anesti, M., Zhuang, Y., and Percival, M.
- Subjects
299.5 ,China ,Gardens ,Hermits ,Enlightenment ,Reclusion ,Public Duty ,Confucianism ,Neo-Confucianism ,Shaftesbury - Abstract
This thesis explores how the experience of reclusion in free landscapes and private gardens of Confucian China and Enlightenment Europe contributed to people’s moral improvement by cultivating good passions such as temperance, encouraging introspection, increasing the sense of responsibility towards society and rendering erudite individuals prompt to perform their public duty as politicians and civil servants. The thesis is based on the comparative analysis of philosophical concepts, works of art, poems and cultural practices in order to highlight the similarities and divergences between Chinese and European – particularly British and French - eremitic landscape dwelling. Taking into account the historical context in which two important systems of thought were developed in different geographic regions, the research brings together the state-sanctioned Confucian ethics with Enlightenment Deism which, inspired by Roman Stoics, played a pivotal role in the promulgation of reclusive landscape culture and the creation of non-geometrical gardens used as retreats in the eighteenth-century Europe. Investigating human relationships with the natural environment and organized society, as well as views on interpersonal relationships, established religion and matters of cultural heritage, the thesis shows that gardens where Confucian literati and socially privileged Europeans, who had espoused Enlightenment ideals, liked to retire comprised mediating spaces between the private realm and the public sphere, solitude and public action. Eremitic landscape dwelling did not derive from a sentiment of contempt for the world or from a selfish desire to avoid hardships. Rather, this noble form of reclusion whose purpose was the cultivation of virtue and humaneness revolved around the greatest interest of individuals and the welfare of society.
- Published
- 2020
10. Chinese face and Western body : images of masculinity in Xu Beihong's paintings
- Author
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Zhou Pearce, A., Wagner, C., and Zhuang, Y.
- Subjects
750 - Abstract
This thesis explores images of masculinity in Chinese visual art in the early twentieth century paintings of Xu Beihong. In particular, I focus on Xu’s introduction of Western idealism into Chinese figurative painting and his effort to transform China’s “face.” When Xu Beihong returned to China in 1927 after studying Western art in Paris and other cultural centers for eight years, he brought with him a new vision of ideal masculinity, one which would not only embody national spirituality, but also bring back China’s “face” after a series of national defeats and perceived humiliations. Inspired by idealistic Western art, Xu replaced conventional depictions of Chinese men (which were typically rather androgynous, gentle, stiff, stylized, and clothed) with more heroic, muscular, graceful, idealized and naked images that could combat the visual image of Chinese men as the ‘sick men of East Asia.’ Unfortunately, this aspect of his work has been either ignored by Chinese scholars or has opened him up to attack in Chinese art circles and in Western criticism. The dissertation proposes that the time is ripe for a new appreciation of this aspect of his work. I further argue that a specific focus on Xu’s representation of masculinity enables us to place him in proper historical context. I use the concept of Chinese face as a lens through which to gain insight into the trajectory of Xu Beihong’s creative life as an impoverished and provincial traditional painter, as a practitioner of Western idealism, and as a pioneer and educator who ventured to reimagine Chinese men. This dissertation intends to clarify that face was among Xu’s primary reasons for adherence to idealism and that restoring face was one of his ultimate goals.
- Published
- 2020
11. The sceptre and the sextant : imperialism and scientism in the travelogues of Johan Nieuhof, Lord George Macartney, and A.E. van Braam Houckgeest
- Author
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Sanchez, R. and Zhuang, Y.
- Subjects
951 - Abstract
In this paper, I discuss the interrelation between scientism and imperialism, as it plays out in three milestone travelogues written on China in the 17th and 18th centuries; namely, the travelogues of Johan Nieuhof (1669), Lord George Macartney (1797), and Andreas Everard van braam Houckgeest (1798). Understanding the lasting significance of these texts, I argue, requires placing them - and by extension the embassies which originated them - in context of the burgeoning scientific ideology of their era. To do this, I will first introduce my key texts, and argue for why I believe they can be considered sites of inquiry into the impact of scientific ideology upon Western European conceptions of China. Then I will discuss in more detail my theoretical framework, its derivation, my exegetical methodology, and my justifications for making such an analysis of Nieuhof, Macartney, and Houckgeest. Then, to set the stage for the close readings to come, I will consider the comparative levels of scientific and technological sophistication in Western Europe and China during the long 18th century, as well as the current state of this academic discourse itself, by reviewing various essential works on the subject. In my second chapter, I will perform my analysis of Nieuhof's travelogue. In my third, I will overview a selection of texts by Sir William Temple, who will be considered as an ideological foil to Nieuhof. In chapters four and five, I will analyse the travelogues of Lord George Macartney and A.E. van Braam Houckgeest respectively, extending to them the methodology already applied to Nieuhof. Then in chapter six, I will briefly set aside my diplomats to address historian of the book Benjamin Schmidt's critique of author-focused exegeses of premodern Dutch travel literature - a critique which, in calling into question the legitimacy of analyses like my own, demands address. I will overview my exegeses and suggest avenues for future research in chapter seven. And finally, in my epilogue, I will conclude my thesis by briefly sketching an example of how the relationship between early modern scientism and imperialism continued to develop into the 19th century.
- Published
- 2019
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