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Robust AVS audio watermarking

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science china(information sciences) 2010年第3期53卷 607-618页

作者： wang Yong & HUANG JiWu Guangdong Key Laboratory of information Security technology, school of information science and technology, sun yat-sen university, guangzhou 510275, china 1. Guangdong Key Laboratory of information Security technology School of Information Science and Technology Sun Yat-Sen University Guangzhou 510275 China

Part Ⅲ of AVS (china Audio and Video Coding Standard) is the first generic audio standard proposed in china and is becoming popular in some applications. For MP3 audio, some effiorts have been made to solve the copyright pirating and malicious modifications by the way of watermarking. To our best knowledge, similar work on the AVS audio has not been explored. In this paper, we present a novel robust watermarking algorithm for AVS audio. We find that the frame type in the AVS coded process can be used as a robust feature for watermarking. Then we design a novel watermarking algorithm which is integrated into the AVS audio coding process. The watermark bits are embedded into the compressed bit stream. At the extracting end, the watermark bits can be extracted from the compressed bit stream directly. This algorithm achieves robustness to decoding/re-coding attacks, and has low computation complexity for both embedding and extracting while preserving the quality of the audio signals.

关键词： AVS audio security problems robust watermarking

Molecular characterization and expression analysis of caveolin-1 in pig tissues

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science china(Life sciences) 2008年第7期51卷 655-661页

作者： wang Chong1,MEI YingJie 1,LI Li 1,MO DeLin 2,LI JiaQi 1,ZHANG Hao 1,TIAN XingGuo 1 &CHEN YaoSheng2 1College of Animal science,South china Agricultural university,guangzhou 510642,china 2school of Life science,sun yat-sen university,guangzhou 510006,china 1. College of Animal science South China Agricultural University Guangzhou 510642 China 2. school of Life science Sun Yat-Sen University Guangzhou 510006 China

Members of the caveolin family played important roles during fundamental cellular processes,such as regulation of cell morphology,migration,and gene expression in muscle *** this study,caveolin-1 (Cav-1),one of the caveolins,was identified from longissimus dorsi muscle of Large Yorkshire pig and Chinese indigenous Lantang pig based on the results of mRNA differential display *** deduced amino acids sequence of the porcine Cav-1 contained a caveolin domain,and was very conservative among different *** Cav-1 mRNA was widely expressed in the eight tissues in this study,including heart,liver,kidney,encephalon,spleen,lung,longissimus dorsi muscle,and back fat, and the highest expression quantity was found in back fat of the two pig *** expression quantity of porcine Cav-1 in back fat and longissimus dorsi muscle of Lantang pig was significantly higher than that of Large Yorkshire(P1,and P1 might be a candidate gene for carcass traits,and might provide valuable information for understanding the mechanism of caveolae signaling in fat deposition by using the animal model of pig.

关键词： caveolin family clone expression analysis real-time quantify PCR

Fast Fourier-Galerkin methods for first-kind logarithmic-kernel integral equations on open arcs

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science china Mathematics 2010年第1期53卷 1-22页

作者： wang Bo1,wang Rui2 & XU YueSheng3,4,1Academy of Mathematics and Systems science,Chinese Academy of sciences,Beijing 100190,china 2school of information science and Engineering,Graduate university of the Chinese Academy of sciences,Beijing 100190,china 3Department of Mathematics,Syracuse university,Syracuse,NY 13244,USA 4Department of Scientific Computing and Computer Applications,sun yat-sen university,guangzhou 510275,china 1. Academy of Mathematics and Systems science Chinese Academy of Sciences Beijing 100190 China2. School of Information Science and Engineering Graduate University of the Chinese Academy of Sciences Beijing 100190 China3. Department of Mathematics Syracuse University Syracuse NY 13244 USA4. Department of Scientific Computing and Computer Applications Sun Yat-sen University Guangzhou 510275 China

We propose a fully discrete fast Fourier-Galerkin method for solving an integral equation of the first kind with a logarithmic kernel on a smooth open arc,which is a reformulation of the Dirichlet problem of the Laplace equation in the *** optimal convergence order and quasi-linear complexity order of the proposed method are established.A precondition is *** this method with an efficient numerical integration algorithm for computing the single-layer potential defined on an open arc,we obtain the solution of the Dirichlet problem on a smooth open arc in the *** examples are presented to confirm the theoretical estimates and to demonstrate the efficiency and accuracy of the proposed method.

关键词： Dirichlet problem open arc singular boundary integral equations Fourier-Galerkin methods logarithmic potentials

Design of a visualized management system of vehicle gas tanks based on RFID

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Design of a visualized management system of vehicle gas tank...

Advancing large-scale thin-film PPLN nonlinear photonics with segmented tunable micro-heaters

2008’“先进集成技术”院士论坛暨第二届仪表、自动化与先进集成技术大会

作者： wang Yonghua~1 Zhan Yiju~2 Yang Jian~1 Yu Songsen~(2,3) (1 school of information science and technology sun yat-sen university guangzhou 510275 2 school of Engineering sun yat-sen university guangzhou 510275 3 school of Computer Nanchang university Nanchang 330031)

A management system of vehicle gas tanks based on RFID technology is designed in this *** system utilizes the characters of RFID such as contactless identification *** this system,the gas-fill operation only in the situation that the gas tank is registered and examined qualified,and the operator ID card is *** avoids the random *** system can automatic record the gas-fill data,therefore the supervision and management of the vehicle gas tanks become simple and effective.

关键词： RFID vehicle gas tank management system

来源： cnki会议评论

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Photonics Research 2024年第8期12卷 1703-1708页

作者： XIAOTING LI HAOCHUAN LI ZHENZHENG wang ZHAOXI CHEN FEI MA KE ZHANG WENZHAO sun CHENG wang Department of Electrical Engineering City University of Hong KongHong KongChina school of Physics Sun Yat-sen UniversityGuangzhou 510275China City university of Hong Kong(Dongguan) Dongguan 523808China Center of information and Communication technology City University of Hong Kong Shenzhen Research InstituteShenzhen 518057China State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongHong KongChina

Thin-film periodically poled lithium niobate(TF-PPLN)devices have recently gained prominence for efficient wavelength conversion processes in both classical and quantum ***,the patterning and poling of TF-PPLN devices today are mostly performed at chip scales,presenting a significant bottleneck for future largescale nonlinear photonic systems that require the integration of multiple nonlinear components with consistent performance and low ***,we take a pivotal step towards this goal by developing a wafer-scale TF-PPLN nonlinear photonic platform,leveraging ultraviolet stepper lithography and an automated poling *** address the inhomogeneous broadening of the quasi-phase matching(QPM)spectrum induced by film thickness variations across the wafer,we propose and demonstrate segmented thermal optic tuning modules that can precisely adjust and align the QPM peak wavelengths in each *** the segmented micro-heaters,we show the successful realignment of inhomogeneously broadened multi-peak QPM spectra with up to 57%enhancement of conversion *** achieve a high normalized conversion efficiency of 3802%W-1cm-2in a 6 mm long PPLN waveguide,recovering 84%of the theoretically predicted efficiency in this *** advanced fabrication techniques and segmented tuning architectures presented herein pave the way for wafer-scale integration of complex functional nonlinear photonic circuits with applications in quantum information processing,precision sensing and metrology,and low-noise-figure optical signal amplification.

关键词： tuning tunable waveguide

Energy-Efficient Routing Scheme for Distributed Regression in Wireless sensor Network

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Energy-Efficient Routing Scheme for Distributed Regression i...

基于零空间表示和最大似然的欠定盲源分离方法

第二十七届中国控制会议

作者： Hou Chaojun,wang Guoli school of information science & technology,sun yat-sen university,guangzhou 510275,P.R.china

This paper presents an energy-efficient routing scheme for the in-network implementation of data regression modelling in wireless sensor networks（WSNs） .With the kernel based distributed representation,a clustering based routing architecture is proposed to implement the distributed Gaussian elimination for solving the regression algebraic *** particular,the skeleton routing tree is built to coordinate the local computations associated with the *** rest ramose nodes within each cluster are limited to contribute the corresponding local *** with the junction tree formation over all nodes,the notion of skeleton tree（ST） proposed here suppresses the redundant message passing among the ramose nodes with each cluster without deteriorating data modelling *** results are reported to demonstrate the effectiveness of the proposed approach.

关键词： Wireless sensor networks Routing Distributed computation Data acquisition Regression

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通信学报 2012年第3期33卷 183-190页

作者：王荣杰詹宜巨周海峰中山大学信息科学与技术学院广东广州510006 集美大学轮机工程学院福建厦门361021 中山大学工学院广东广州510006

针对欠定情况下源数的估计、解混叠矩阵和源信号恢复关键技术,提出一种源数未知的欠定盲源分离算法,首先利用S变换和聚类技术相结合来估算源数和混叠矩阵,然后将源信号以零空间形式表示,再通过最大似然估计关于其后验概率以达到恢复源... 详细信息

针对欠定情况下源数的估计、解混叠矩阵和源信号恢复关键技术,提出一种源数未知的欠定盲源分离算法,首先利用S变换和聚类技术相结合来估算源数和混叠矩阵,然后将源信号以零空间形式表示,再通过最大似然估计关于其后验概率以达到恢复源信号的目的。仿真实验结果表明了该方法不仅能同时分离服从超高斯分布和亚高斯分布的源信号,且比其他传统的方法具有更优越的估计性能。

关键词：欠定盲源分离 S变换模糊c均值聚类零空间表示最大似然

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多分辨率二维直方图阈值分割方法

计算机工程与应用 2009年第35期45卷 182-184页

作者：何书前吴丽华王建新吴淑雷海南师范大学信息科学技术学院海口571158 中山大学信息科学与技术学院广州510275

鉴于二维直方图阈值分割方法利用灰度的空间相关性取得高的分割效果和多分辨率阈值分割方法具有阈值搜索灵活高效的特点,提出了一种基于多分辨率的二维直方图自适应阈值分割的结合方案,降低了二维直方图计算复杂度,提高了多分辨率阈值... 详细信息

鉴于二维直方图阈值分割方法利用灰度的空间相关性取得高的分割效果和多分辨率阈值分割方法具有阈值搜索灵活高效的特点,提出了一种基于多分辨率的二维直方图自适应阈值分割的结合方案,降低了二维直方图计算复杂度,提高了多分辨率阈值方法的搜索精度。实验结果表明,该方法取得的分割结果与二维直方图方法基本一致,计算复杂度随分辨率的级数成指数下降。

关键词：直方图多分辨率阈值图像分割

Broadband and fabrication-tolerant 3-dB couplers with topological valley edge modes

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Light(science & Applications) 2024年第8期13卷 1623-1630页

作者： Guo-Jing Tang Xiao-Dong Chen Lu sun Chao-Heng Guo Meng-Yu Li Zhong-Tao Tian Hou-Hong Chen Hong-Wei wang Qi-Yao sun Ying-Di Pan Xin-Tao He Yi-Kai Su Jian-Wen Dong school of Physics&State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

3-dB couplers,which are commonly used in photonic integrated circuits for on-chip information processing,precision measurement,and quantum computing,face challenges in achieving robust performance due to their limited 3-dB bandwidths and sensitivity to fabrication *** address this,we introduce topological physics to nanophotonics,developing a framework for topological 3-dB *** couplers exhibit broad working wavelength range and robustness against fabrication dimensional *** leveraging valley-Hall topology and mirror symmetry,the photonic-crystal-slab couplers achieve ideal 3-dB splitting characterized by a wavelength-insensitive scattering *** analysis confirms the superiority on broad bandwidth of 48 nm and robust splitting against dimensional errors of 20 *** further propose a topological interferometer for on-chip distance measurement,which also exhibits robustness against dimensional *** extension of topological principles to the fields of interferometers,may open up new possibilities for constructing robust wavelength division multiplexing,temperature-drift-insensitive sensing,and optical coherence tomography applications.

关键词： topological splitting insensitive