Robust video watermarking algorithm for H.264/AVC based on JND model

( Weiwei Zhang ),( Xin Li ),( Yuzhao Zhang ),( Ru Zhang ),( Lixin Zheng ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.5

With the purpose of copyright protection for digital video, a novel H.264/AVC watermarking algorithm based on JND model is proposed. Firstly, according to the characteristics of human visual system, a new and more accurate JND model is proposed to determine watermark embedding strength by considering the luminance masking, contrast masking and spatial frequency sensitivity function. Secondly, a new embedding strategy for H.264/AVC watermarking is proposed based on an analysis on the drift error of energy distribution. We argue that more robustness can be achieved if watermarks are embedded in middle and high components of 4×4 integer DCT since these components are more stable than dc and low components when drift error occurs. Finally, according to different characteristics of middle and high components, the watermarks are embedded using different algorithms, respectively. Experimental results demonstrate that the proposed watermarking algorithm not only meets the imperceptibility and robustness requirements, but also has a high embedding capacity.

Design and Realization of a Digital PV Simulator with a Push-Pull Forward Circuit

Zhang, Jike,Wang, Shengtie,Wang, Zhihe,Tian, Lixin The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.3

This paper presents the design and realization of a digital PV simulator with a Push-Pull Forward (PPF) circuit based on the principle of modular hardware and configurable software. A PPF circuit is chosen as the main circuit to restrain the magnetic biasing of the core for a DC-DC converter and to reduce the spike of the turn-off voltage across every switch. Control and I/O interface based on a personal computer (PC) and multifunction data acquisition card, can conveniently achieve the data acquisition and configuration of the control algorithm and interface due to the abundant software resources of computers. In addition, the control program developed in Matlab/Simulink can conveniently construct and adjust both the models and parameters. It can also run in real-time under the external mode of Simulink by loading the modules of the Real-Time Windows Target. The mathematic models of the Push-Pull Forward circuit and the digital PV simulator are established in this paper by the state-space averaging method. The pole-zero cancellation technique is employed and then its controller parameters are systematically designed based on the performance analysis of the root loci of the closed current loop with $k_i$ and $R_L$ as variables. A fuzzy PI controller based on the Takagi-Sugeno fuzzy model is applied to regulate the controller parameters self-adaptively according to the change of $R_L$ and the operating point of the PV simulator to match the controller parameters with $R_L$. The stationary and dynamic performances of the PV simulator are tested by experiments, and the experimental results show that the PV simulator has the merits of a wide effective working range, high steady-state accuracy and good dynamic performances.

STABILITY OF IMPULSIVE CELLULAR NEURAL NETWORKS WITH TIME-VARYING DELAYS

Zhang, Lijuan,Yu, Lixin The Korean Society for Computational and Applied M 2011 Journal of applied mathematics & informatics Vol.29 No.5

This paper demonstrates that there is a unique exponentially stable equilibrium state of a class of impulsive cellular neural network with delays. The analysis exploits M-matrix theory and generalized comparison principle to derive some easily verifiable sufficient conditions for the global exponential stability of the equilibrium state. The results extend and improve earlier publications. An example with its simulation is given for illustration of theoretical results.

Components of Soil Humic Substances in Larch Plantation of Northeast China and their Effect on Soil Acidity

Lixin Chen,Wenbiao Duan,Chao Zhang 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Modulation of Secreted Virulence Factor Genes by Subinhibitory Concentrations of Antibiotics in Pseudomonas aeruginosa

Lixin Shen,Ying Shi,Dan Zhang,Jinhua Wei,Michael G. Surette,Kangmin Duan 한국미생물학회 2008 The journal of microbiology Vol.46 No.4

Recent studies have shown that subinhibitory antibiotics play important roles in regulating bacterial genes including virulence factor genes. In this study, the expression of 13 secreted virulence related gene clusters of Pseudomonas aeruginosa, an important opportunistic pathogen, was examined in the presence of subinhibitory concentrations of 4 antibiotics: vancomycin, tetracycline, ampicilin and azithromycin. Activation of gene expression was observed with phzA1, rhlAB, phzA2, lasB, exoY, and exoS. Subinhibitory concentrations of vancomycin resulted in more than 10-fold increase of rhlAB and phzA2 transcription. Both rhamnolipid production and pyocyanin production were significantly elevated, correlating phenotypes with the increased transcription. P. aeruginosa swarming and swimming motility also increased. Similar results were observed with subinhibitory tetracycline, azithromycin and ampicillin. These results indicate that the antibiotics at low concentrations can up-regulate virulence factors and therefore influence bacterial pathogenesis.

Design and Realization of a Digital PV Simulator with a Push-Pull Forward Circuit

Jike Zhang,Shengtie Wang,Zhihe Wang,Lixin Tian 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.3

This paper presents the design and realization of a digital PV simulator with a Push-Pull Forward (PPF) circuit based on the principle of modular hardware and configurable software. A PPF circuit is chosen as the main circuit to restrain the magnetic biasing of the core for a DC-DC converter and to reduce the spike of the turn-off voltage across every switch. Control and I/O interface based on a personal computer (PC) and multifunction data acquisition card, can conveniently achieve the data acquisition and configuration of the control algorithm and interface due to the abundant software resources of computers. In addition, the control program developed in Matlab/Simulink can conveniently construct and adjust both the models and parameters. It can also run in real-time under the external mode of Simulink by loading the modules of the Real-Time Windows Target. The mathematic models of the Push-Pull Forward circuit and the digital PV simulator are established in this paper by the state-space averaging method. The pole-zero cancellation technique is employed and then its controller parameters are systematically designed based on the performance analysis of the root loci of the closed current loop with ki and RL as variables. A fuzzy PI controller based on the Takagi-Sugeno fuzzy model is applied to regulate the controller parameters self-adaptively according to the change of RL and the operating point of the PV simulator to match the controller parameters with RL. The stationary and dynamic performances of the PV simulator are tested by experiments, and the experimental results show that the PV simulator has the merits of a wide effective working range, high steady-state accuracy and good dynamic performances.

Identification and characterization of a novel goose-type and chickentype lysozyme genes in Chinese rare minnow (Gobiocypris rarus) with potent antimicrobial activity

Yingying Zhang,Hui Yang,Weijia Song,Dan Cui,Lixin Wang 한국유전학회 2018 Genes & Genomics Vol.40 No.6

Lysozymes act as important innate immunity molecule against various pathogen infections. In the present study, a new c-type and g-type lysozymes were isolated from rare minnow Gobiocypris rarus. The deduced amino acid sequence of c-type lysozyme contained 145 residues and possessed conserved catalytic residues ( Glu53 and Asp72). The deduced g-type lysozyme contained 185 residues and possessed three conserved catalytic residues ( Glu73, Asp86 and Asp97). qPCR analysis revealed that GrlysG and GrlysC were constitutively expressed in all examined tissues. GrlysG was most abundant in kidney and liver, while GrlysC was predominantly expressed in liver. The transcripts of GrlysG and GrlysC genes could be significantly up-regulated after Aeromonas hydrophila and poly I:C infection in the kidney and liver. The recombinant GrlysG and GrlysC proteins were successfully produced and purified. The optimal pH and temperature for rGrlysG and rGrlysC protein lytic activities was determined to be 6.5 and 32 °C, respectively. From the minimal inhibitory concentration test, the rGrlysG and rGrlysC exhibited apparent antibacterial activities against both Gram-positive and Gram-negative bacteria at different concentrations. In conclusion, the present study indicated that c-type and g-type lysozymes participated the innate immune response to A. hydrophila and virus infections in fish.

STABILITY OF IMPULSIVE CELLULAR NEURAL NETWORKS WITH TIME-VARYING DELAYS

Lijuan Zhang,Lixin Yu 한국전산응용수학회 2011 Journal of applied mathematics & informatics Vol.29 No.5

This paper demonstrates that there is a unique exponentially stable equilibrium state of a class of impulsive cellular neural network with delays. The analysis exploits M-matrix theory and generalized comparison principle to derive some easily verifiable suffcient conditions for the global exponential stability of the equilibrium state. The results extend and improve earlier publications. An example with its simulation is given for illustration of theoretical results.

Rotor Profile Design and Motion Simulation Analysis of Hydrogen Circulating Pump

Jiawei Lin,Lixin Zhang,Liang Dong,Houlin Liu,Cui Dai 한국유체기계학회 2021 International journal of fluid machinery and syste Vol.14 No.4

With the development of automotive fuel cells towards high power and high efficiency, higher requirements are put forward for the speed and boost ratio of hydrogen circulation pump, while high speed and boost ratio increase the pulsation characteristics and accelerate the aging of hydrogen fuel cells. Cam type hydrogen cycle pump has the advantages of compact structure, high efficiency under low boost ratio, and good adaptability to low temperature, so it has become an important research direction. The efficient and reasonable rotor profile design can improve the volumetric efficiency of the cam rotor pump. It can reduce the pressure pulsation and flow pulsation in the pump. The equation of multi-stage circular arc rotor profile is established according to the meshing principle of the rotor. Motion Simulation module in UG NX is employed to conduct dynamic interference detection of rotor mechanism and simulation analysis of rotor mechanism meshing motion on the rotating parts of the hydrogen circulating pump. So the angular velocity curve and meshing force change curve of the driven gear is obtained. In order to verify the rationality of rotor profile design, the meshing force is compared with the standard spur gear.

Residual Defect Prediction using Multiple Technologies

WanJiang Han,LiXin Jiang,TianBo Lu,XiaoYan Zhang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.8

Finding defects in a software system is not easy. Effective detection of software defects is an important activity of software development process. In this paper, we propose an approach to predict residual defects, which applies machine learning algorithms (classifiers) and defect distribution model. This approach includes two steps. Firstly, use machine learning Algorithms and Association Rules to get defect classification table, then confirm the defect distribution trend referring to several distribution models. Experiment results on a GUI project show that the approach can effectively improve the accuracy of defect prediction and be used for test planning and implementation.