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Search Results: 1 - 10 of 47012 matches for " Xiang Huang "
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Praxis Filosófica , 2007,
Abstract: the critiques of philip kitcher's social epistemology and theory of scientific practices have concentrated on his adoption of individualistic methodology. i try to show that, on the one hand, the purpose of kitcher's adoption of individualistic methodology is searching for an adequate social epistemology; on the other hand, the problems come from two presumptions: a) there is a clear distinction between the internal (individual) and the external (social) aspects of epistemic processes; b) the epistemic norms as reason in an epistemic process have to be internal. i argue that, even if kitcher's purpose of searching for an adequate social epistemology is correct, both presumptions are questionable, and that the reflection upon them suggest an alternative perspective for the investigation of social epistemology.
Research on the Ecological Conflict between Coastal Wetland and Port Construction—A Case Study of the Meizhou Gulf  [PDF]
Jun Hu, Mu Zhang, Xiang Huang
Low Carbon Economy (LCE) , 2014, DOI: 10.4236/lce.2014.52007
Abstract: This article is a study on the management of wetland. The future impact of landscape of coastal wetland with the constant changes of human activities is discussed on the basis of the theory and methodology of landscape ecology. Solutions to the contradictions of ecological protection and port construction are put forward.
Crosstalk between tumor cells and microenvironment via Wnt pathway in colorectal cancer dissemination
Dan Huang, Xiang Du
World Journal of Gastroenterology , 2008,
Abstract: Invasion and metastasis are the deadly face of malignant tumors. Considering the high rate of incidence and mortality of colorectal cancer, it is critical to determine the mechanisms of its dissemination. In the parallel investigation of the invasive front and tumor center area of colorectal cancer (CRC), observation of heterogeneous β-catenin distribution and epithelial-mesenchymal transition (EMT) at the invasive front suggested that there might be a crosstalk between tumor cells and the tumor microenvironment. Wnt signaling pathway is also involved in the cancer progression due to its key role in CRC tumorigenesis. Moreover, in recent years, there is increasing evidence that the regulators of microenvironment, including extracellular matrix, growth factors and inflammatory factors, are associated with the activation of Wnt pathway and the mobility of tumor cells. In this review, we will try to explain how these molecules trigger metastasis via the Wnt pathway.
Analysis of Quantization-based Audio Watermarking to D/A and A/D Conversions
Shijun Xiang,Jiwu Huang
International Journal of Network Security , 2006,
Abstract: Due to its advantages, quantization-based embedding has been introduced into audio watermarking to improve robustness performance. Existing audio watermarking algorithms often focus on a given attack. However, in some transmission environments, digital audio files may suffer from the different attacks. For example, effects of D/A and A/D conversions (denoted as DA/AD in this paper) on audio watermarking may be modeled as modification of signal energy, phase changes, and noises corruption. These effects present an important challenge to audio watermarking. Extensive experiments show that phase changes of audio signals caused by the DA/AD may be represented as some extent of temporal scaling. Furthermore, we analyze the performance of quantization-based audio watermarking against these attacks in the DA/AD, and present corresponding calculation expressions of {em BER} (Bit Error Rate) in case of Gaussian noise and modification of audio amplitude, and then investigate the influences of temporal scaling caused by the DA/AD on audio watermarking. As a conclusion, audio watermarking quantization-based is very susceptible to the DA/AD.
Optimal Design of Multiple Description Lattice Vector Quantizers
Xiang Huang,Xiaolin Wu
Mathematics , 2006,
Abstract: In the design of multiple description lattice vector quantizers (MDLVQ), index assignment plays a critical role. In addition, one also needs to choose the Voronoi cell size of the central lattice v, the sublattice index N, and the number of side descriptions K to minimize the expected MDLVQ distortion, given the total entropy rate of all side descriptions Rt and description loss probability p. In this paper we propose a linear-time MDLVQ index assignment algorithm for any K >= 2 balanced descriptions in any dimensions, based on a new construction of so-called K-fraction lattice. The algorithm is greedy in nature but is proven to be asymptotically (N -> infinity) optimal for any K >= 2 balanced descriptions in any dimensions, given Rt and p. The result is stronger when K = 2: the optimality holds for finite N as well, under some mild conditions. For K > 2, a local adjustment algorithm is developed to augment the greedy index assignment, and conjectured to be optimal for finite N. Our algorithmic study also leads to better understanding of v, N and K in optimal MDLVQ design. For K = 2 we derive, for the first time, a non-asymptotical closed form expression of the expected distortion of optimal MDLVQ in p, Rt, N. For K > 2, we tighten the current asymptotic formula of the expected distortion, relating the optimal values of N and K to p and Rt more precisely.
Robust reliable control of uncertain 2D discrete switched systems with state delays
Shipei Huang,Zhengrong Xiang
Mathematics , 2012,
Abstract: This paper is concerned with the problem of robust reliable control for a class of uncertain 2D discrete switched systems with state delays represented by a model of Roesser type. The parameter uncertainties are assumed to be norm-bounded. Firstly, delay-dependent sufficient condition for the exponential stability of the discrete 2D systems with state delays is established. Then, the concept of average dwell time is extended to 2D switched systems, and a reliable state feedback controller is developed in terms of linear matrix inequalities (LMIs) such that the resulting closed-loop system is exponentially stable for all admissible uncertainties and actuator failures. The dwell time approach is utilized for the stability analysis and controller design. Finally, an example is included to demonstrate the effectiveness of the proposed approach.
Stabilization of 2D discrete switched systems with state delays under asynchronous switching
Shipei Huang,Zhengrong Xiang
Mathematics , 2012,
Abstract: This paper is concerned with the problem of robust stabilization for a class of uncertain 2D discrete switched systems with state delays represented by a model of Roesser type, where the switching instants of the controller experience delays with respect to those of the system, and the parameter uncertainties are assumed to be norm-bounded. A state feedback controller is proposed to guarantee exponential stability for such 2D discrete switched systems, and the dwell time approach is utilized for the stability analysis and controller design. A numerical example is given to illustrate the effectiveness of the proposed method.
Robust Audio Watermarking Against the D/A and A/D conversions
Shijun Xiang,Jiwu Huang
Computer Science , 2007,
Abstract: Audio watermarking has played an important role in multimedia security. In many applications using audio watermarking, D/A and A/D conversions (denoted by DA/AD in this paper) are often involved. In previous works, however, the robustness issue of audio watermarking against the DA/AD conversions has not drawn sufficient attention yet. In our extensive investigation, it has been found that the degradation of a watermarked audio signal caused by the DA/AD conversions manifests itself mainly in terms of wave magnitude distortion and linear temporal scaling, making the watermark extraction failed. Accordingly, a DWT-based audio watermarking algorithm robust against the DA/AD conversions is proposed in this paper. To resist the magnitude distortion, the relative energy relationships among different groups of the DWT coefficients in the low-frequency sub-band are utilized in watermark embedding by adaptively controlling the embedding strength. Furthermore, the resynchronization is designed to cope with the linear temporal scaling. The time-frequency localization characteristics of DWT are exploited to save the computational load in the resynchronization. Consequently, the proposed audio watermarking algorithm is robust against the DA/AD conversions, other common audio processing manipulations, and the attacks in StirMark Benchmark for Audio, which has been verified by experiments.
Generation of biomaterial particles with controlled dimensions via electrospraying  [PDF]
Xiang Li, Gaorong Han, Jie Huang, Mohan Edirisinghe, William Bonfield
Open Journal of Regenerative Medicine (OJRM) , 2012, DOI: 10.4236/ojrm.2012.11002
Abstract: It is well known that small biomaterial particles can lead to superior properties demanded by advanced applications in tissue engineering. Electrospraying has been considered as a promising approach to prepare fine particles, but reducing the particle size during such jetting process is always challenging. This is because the size of the as-sprayed particles is always limited by the device outlet diameter used. In the study we show that hydroxyapatite (HA) relics of 2 - 3 μm with low standard deviation can be deposited using a large nozzle (diameter of 1100 μm) only by reducing the nozzle tip angle from 90° to 15°. The mechanism of such phenomenon was extensively discussed, and a range of refined HA patterns were successfully prepared using the updated electrspraying configuration. We anticipate our findings to have a significant impact on the research of nanostructured biomaterials with superior properties which are realized by reducing the particle size using a greener electrically-driven processing technique.
The Charge Storage of Doubly Stacked Nanocrystalline-Si based Metal Insulator Semiconductor Memory Structure  [PDF]
Xiang Wang, Chao Song, Yanqing Guo, Jie Song, Rui Huang
Modeling and Numerical Simulation of Material Science (MNSMS) , 2013, DOI: 10.4236/mnsms.2013.31B006
Abstract: Doubly stacked nanocrystalline-Si (nc-Si) based metal insulator semiconductor memory structure was fabricated by plasma enhanced chemical vapor deposition. Capacitance-Voltage (C-V) and capacitance-time (C-t) measurements were used to investigate electron tunnel, storage and discharging characteristic. The C-V results show that the flatband voltage increases at first, then decreases and finally increases, exhibiting a clear deep at gate voltage of 9 V. The de-creasing of flatband voltage at moderate programming bias is attributed to the transfer of electrons from the lower nc-Si layer to the upper nc-Si layer. The C-t measurement results show that the charges transfer in the structure strongly de-pends on the hold time and the flatband voltage decreases markedly with increasing the hold time.
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