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Search Results: 1 - 10 of 82395 matches for " Lian Chen "
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Multistage Numerical Picard Iteration Methods for Nonlinear Volterra Integral Equations of the Second Kind  [PDF]
Lian Chen, Junsheng Duan
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.511061
Abstract: Using the Picard iteration method and treating the involved integration by numerical quadrature formulas, we propose a numerical scheme for the second kind nonlinear Volterra integral equations. For enlarging the convergence region of the Picard iteration method, multistage algorithm is devised. We also introduce an algorithm for problems with some singularities at the limits of integration including fractional integral equations. Numerical tests verify the validity of the proposed schemes.
On the Collusion-Resistance of the Fingerprinting Algorithm Based on Additive Watermarking
Xi Chen,Shiguo Lian
Journal of Multimedia , 2011, DOI: 10.4304/jmm.6.4.369-375
Abstract: Digital fingerprinting is the technique used for traitor tracing in multimedia content distribution. It embeds unique customer information (e.g., customer ID) into multimedia content and generates different copies for different customers. The unique customer information can be extracted from the illegal copy and used to tell the traitor who re-distributes his copy to other unauthorized customers. Till now, there exist some fingerprint embedding algorithms, such as additive embedding, multiplicative embedding, quantization embedding, etc. However, the ability to resist collusion attacks is not studied. Collusion attack is the biggest threat to fingerprinting algorithms, which combines several copies together to produce a new copy without customer information. In this paper, the fingerprinting algorithm based on additive embedding is considered, its robustness against various collusion attacks are analyzed. The theoretical results are given, together with some simulation results. As is shown, the considered fingerprinting algorithm is robust against some of the collusion attacks, while becomes fragile to some other collusion attacks with the rise of the number of colluders. It is expected to provide some advices to design or analyze fingerprinting algorithms.
On the DCT Based Joint Fingerprint Embedding and Decryption Scheme
Xi Chen,Shiguo Lian
Journal of Multimedia , 2010, DOI: 10.4304/jmm.5.5.473-480
Abstract: Till now, some Joint Fingerprinting and Decryption (JFD) schemes have been reported, while few works have been done to analyze their performances. In this paper, the security of the JFD scheme proposed by Kundur et al. is analyzed and improved. The analyses include the compliance with general compression codecs, the security against cryptographic attacks, the security in perception, the relationship between security and robustness, and the relationship between security and imperceptibility. Additionally, some means are proposed to improve the scheme's performances. The encryption in block based DCT is introduced to make it compliant with such compression codec as JPEG or MPEG2. The multi-key encryption is presented to improve the security against cryptographic attacks. The DC encryption is proposed to strengthen the perceptual security against ciphertext-only attacks. These analysis methods can also be used to evaluate some other JFD schemes, and are expected to provide valuable information to design JFD schemes.
N-derivations for finitely generated graded Lie algebras
Cui Chen,Haifeng Lian
Mathematics , 2012,
Abstract: $N$-derivation is the natural generalization of derivation and triple derivation. Let ${\cal L}$ be a finitely generated Lie algebra graded by a finite dimensional Cartan subalgebra. In this paper, a sufficient condition for Lie $N$-derivation algebra of ${\cal L}$ coinciding with Lie derivation algebra of ${\cal L}$ is given. As applications, any $N$-derivation of Schr\"{o}dinger-Virasoro algebra, generalized Witt algebras, Kac-Moody algebras and their Borel subalgebras, is a derivation.
Dependence Study of Optoelectronics Performance on Carefully Differed LiF Thickness in Alq3 Based OLEDs  [PDF]
Shengxun Su, Changxiao Pan, Xi Luo, Wei Chen, Jiarong Lian
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.32B060

The effect of LiF thickness on the electrical and luminescent characteristics in OLEDs has been studied by carefully varying thickness value range from 0 nm to 1.2 nm. It’s interesting to find that the device with 0.2 nm LiF layer performs the largest current and comparative lower luminescent efficiency, while the one with 0.6 nm LiF performs another current peak (lower than that of device with 0.2 nm LiF layer) but the highest luminescent efficiency in all devices. Here the much enhanced electron injection and destructive efficiency for 0.2 nm LiF device are understood by the chemical interaction model at cathode interface, while the fairly increased electron injection and much improved efficiency for 0.6 nm LiF device would be interpreted by other mechanisms, and LiF plays a protective part in preventing the deposition-induce photoluminescence from quenching by Al cathode.

A Complete and Accurate Short Sequence Alignment Algorithm for Repeats  [PDF]
Shuaibin Lian, Tianliang Liu, Ke Gong, Xinwu Chen, Gang Zheng
Journal of Biosciences and Medicines (JBM) , 2016, DOI: 10.4236/jbm.2016.412018
Abstract: Eukaryotic genomes contain a significant fraction of repeats, which have very important biomedical function. Thus, aligning repeats from short sequences back to reference genome is the key step for further genome analysis. Unfortunately, the current aligning algorithms performed poorly in distinguishing repeats and nonrepeats. To this end, we proposed a new algorithm, named HashRepAligner, to address this problem. Finally, the cross comparison with other algorithms was performed, and the results indicated that HashRepAligner outperformed other aligners in terms of the detecting repeats.

Chen Lian,Liu Minzhi,

金属学报 , 1979,
Abstract: 42Mn2 steel cylinders processed by hot extrusion and drawing of flake-con-taining billets have been examined by SEM and by other methods to ascertain theimmunization of flakes in the final products. All internal flakes in the billets werecompletely healed after processing into cylinders, with the exception of those origi-nally exposed to the surface of the billet owing to oxidation. From practical appli-cation point of view, however, little difference in properties has been found betweencylinders completely or incompletely immunized from flakes. Thus, in the fatiguetest of the cylinders within cyclic stress ranges of 10?150 kg/cm~2, no signalsinduced by the formation and propagation of cracks were detected by acoustic emis-sion till 30,000-60,000 cycles. Likewise, the static bursting test of all cylindersalso met the standard set up by the users.

Chen Lian,Liu Minzhi,

金属学报 , 1981,
Abstract: An investigation on the crystallographic orientation and elemental segregation of flakes (hairline cracks) has been carried out by means of etching method and electron optical techniques (SEM, TEM, EPMA and AES). The results obtained are as follow:(1) The microappearances of fracture surface of flakes are a mixed fracture mode of quasicleavages and intergranular tearing waves.(2) The direction of the crack propagation of flakes are mostly along {112} planes of ferrite. These planes are also quasicleavage facets. While the orientation of the dendritic surface of flakes are {111} planes.(3) There are positive segregations of P, Mn, Mo, Cr and Si on the fracture surface of flakes, among which the most one is phosphorus.
Research and Its Implementation of Mathematical Document Based on Dynamic Web

CHEN Lian,

计算机应用研究 , 2006,
Abstract: The basic structures of mathematical document in LaTeX and MathML are analyzed in the article. Then a kind of transformation method is presented from LaTeX to MathML expression, the edition and display of mathematical notation are implemented on the dynamic Web like IM, BBS, and so on.
CY Principal Bundles over Compact K?hler Manifolds
Jingyue Chen,Bong H. Lian
Mathematics , 2014,
Abstract: A CY bundle on a compact complex manifold $X$ was a crucial ingredient in constructing differential systems for period integrals in \cite{LY}, by lifting line bundles from the base $X$ to the total space. A question was therefore raised as to whether there exists such a bundle that supports the liftings of all line bundles from $X$, simultaneously. This was a key step for giving a uniform construction of differential systems for arbitrary complete intersections in $X$. In this paper, we answer the existence question in the affirmative if $X$ is assumed to be K\"ahler, and also in general if the Picard group of $X$ is assumed to be free. Furthermore, we prove a rigidity property of CY bundles if the principal group is an algebraic torus, showing that such a CY bundle is essentially determined by its character map.
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