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Search Results: 1 - 10 of 160656 matches for " Wang Dong-Feng "
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Multi-Objective Optimization Problems with Arena Principle and NSGA-II
Wang Dong-Feng,Xu Feng
Information Technology Journal , 2010,
Abstract: Existing test problems for multi-objective optimization are mainly criticized for high computational complexity. In this study, we introduce a new non- dominated sorting algorithm based on Pareto optimal solutions which alleviates the problem of high computational complexity in NSGA-II. We use the Arena Principle in NSGA-II to retain the non-dominated solutions found during the evolutionary process. The main goal of this work is to keep the fast convergence exhibited by Arena Principle in global optimization when extending this heuristic to multi-objective optimization. The algorithm’s computational complexity is O(rmN). We adopt two standard test functions and simulation results show that the Arena Principle is able to find more useful and better spread of solutions.
Genetic algorithm optimization based proportional-integral-derivative controller for unified chaotic system

Wang Dong-Feng,

物理学报 , 2005,
Abstract: Proportional-integral-derivative (PID) control of unified chaotic system (UCS) was researched. For optimization of PID controller's structure and parameners, a parallel genetic algorithm (PGA) was proposed. In GA evolution process, hybri d decimal system and binary system matrix encoding technique was adopted. Simula tion study results of optimal PID control for UCS show that: 1) UCS can be cont rolled to unstable zero equilibrium point by using only one PI controller. 2) U CS can be controlled to any unstable non-zero equilibrium point by using three PI controllers. 3) The proposed PGA owns global optimization ability, it can av oid premature problem of simple GA. 4) The control system obtained good regulat ing performance and strong robustness.
Adaptive generalized functional synchronization of chaotic systems with unknown parameters

Wang Dong-Feng,Han Pu,

中国物理 B , 2008,
Abstract: A universal adaptive generalized functional synchronization approach to any two different or identical chaotic systems with unknown parameters is proposed, based on a unified mathematical expression of a large class of chaotic system. Self-adaptive parameter law and control law are given in the form of a theorem. The synchronization between the three-dimensional R\"{o}ssler chaotic system and the four-dimensional Chen's hyper-chaotic system is studied as an example for illustration. The computer simulation results demonstrate the feasibility of the method proposed.
Variational solutions for Hermite--Gaussian solitons in nonlocal nonlinear media

Bai Dong-Feng,Huang Chang-Chun,He Jun-Feng,Wang Yi,

中国物理 B , 2009,
Abstract: The physical features exhibited by Hermite--Gaussian (HG) beams propagating in nonlocal nonlinear media with Gaussian-shaped response are discussed with an approximate variational method. Using direct numerical simulations, we find that the beam properties in the normalized system are different with the change of the degree of nonlocality. It is shown that initial HG profiles break up into several individual beams with propagation when the degree of nonlocality $\alpha$ is small. HG beams can propagate stably when $\alpha$ is large enough.
Isolation and Characterization of an Antibacterial Peptide Fraction from the Pepsin Hydrolysate of Half-Fin Anchovy (Setipinna taty)
Ru Song,Rong-Bian Wei,Hong-Yu Luo,Dong-Feng Wang
Molecules , 2012, DOI: 10.3390/molecules17032980
Abstract: Enzymatic proteolysis of food proteins is considered a promising method to generate antibacterial peptides. The objective of the present study was to isolate and characterize peptide fraction from the pepsin hydrolysate of half-fin anchovy (Setipinna taty) with antibacterial activity against Escherichia coli. The most active peptide fraction HAHp2-3-I was isolated by a series of chromatographic methods, including Sephadex G-25 chromatography, reverse high-performance liquid chromatography (RP-HPLC) and Source 5RPC ST. Peptides identification of HAHp2-3-I was carried out using UPLC-LTQ-Orbitrap mass spectrometer. HAHp2-3-I contained five cationic peptides (MLTTPPHAKYVLQW, SHAATKAPPKNGNY, PTAGVANALQHA, QLGTHSAQPVPF and VNVDERWRKL) and three anionic peptides (LATVSVGAVELCY, NPEFLASGDHLDNLQ and PEVVYECLHW). Prediction of peptide secondary structure indicated that these anionic peptides should have extended strand and random coil structures, whereas cationic peptides PTAGVANALQHA and VNVDERWRKL could form alpha helixes. In addition, results of scanning electron microscopy (SEM) revealed that treatment by HAHp2-3-I could cause the morphological changes of E. coli and destruction of the cell integrity via irreversible membrane damage. The results could provide information for investigating the antibacterial model of antibacterial peptides derived from fish protein hydrolysates.
An Integrated Application of Fuzzy Qualitative Modeling and Simulation

WANG Dong-feng,CHENG Ying-wu,

系统工程理论与实践 , 2002,
Abstract: Qualitative reasoning is an inferring technique using qualitative model to derive new knowledge of and gain insight into a physical technical system in some specific issues. It has been applying in areas such as system diagnosis, system functional/behavior simulation, product design and synthesis. The main challenges are that the construction of qualitative model is difficult and its poor reasoning capability. The efficiency of those qualitative techniques is usually low and they can take a while to reach a valuable solution. This paper discusses the implementation of qualitative modeling and fuzzy qualitative simulation. We utilize model fragment library and object-oriented technique to make the modeling process more friendly and ease to use. The introduction of fuzzy sets makes it possible to solve the inherent defection of traditional qualitative reasoning encountered before. Furthermore, we provide ideas on software implementation and practical application.
Proportional-integral-derivative chaotic system control algorithm based on particle swarm optimization

Wang Dong-Feng,Han Pu,

物理学报 , 2006,
Abstract: Proportional-integral-derivative(PID) control algorithm has the property of simplicity and practicability, but it is difficult to be tuned to control a complex nonlinear system. An advanced particle swarm optimization (PSO) was used to optimize the PID controller for controlling chaotic systems. Computer simulation of its application to several chaotic systems has been done. The controlled chaotic systems are the Hénon chaos, Duffing chaos, six-roll UC mill chaos, Nagumo-sato neuron chaos, Chen's chaos, and permanent magnet synchronous motor chaos. Th chaos control simulation results show that: 1) The output feedback based PID control for chaotic systems is effective; 2) using PID to control complex chaotic systems is feasible; and 3) using PSO to optimize the PID parameters for chaos control is effective and simple in programming.
Neural network ensemble based on KICA and KFCM

LI Yan,WANG Dong-feng,HAN Pu,

计算机应用研究 , 2009,
Abstract: This paper proposed neural network ensemble based on KICA and KFCM. First analyzed the data with high dimension patterns using KICA to extract main features. Then used the KFCM algorithm to classify the individual neural network training independent by its output on validate sample and calculated the generalization errors of neural networks in each category to the validate set, according to which the individual neural network whose generalization error was minimum in its category will be selected and combined the predictions of the component networks through majority voting. The experiments show that the proposed approach has higher accuracy and stability compared with other ensemble methods.
2-Anilino-3-(2-hydroxyphenyl)quinazolin-4(3H)-one–triphenylphosphine oxide (1/1)
Hong-Ling Wang,Xiao-Bao Chen,Xu-Hong Yang,Dong-Feng Pan
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810035324
Abstract: In the title compound, C20H15N3O2·C18H15OP, the pyrimidinone heterocycle and the fused phenyl ring are inclined at 1.92 (7)°. Only the hydroxy group is involved in hydrogen bonding, whereas the amino group is shielded from potential acceptors.
Osteogenesis characteristics of cultured rat mesenchymal stem cells under bone induction condition
CHEN Dong-Feng
Zhong Xi Yi Jie He Xue Bao , 2004,
Abstract: Objective: To investigate the osteogenesis characteristics of cultured rat mesenchymal stem cells (MSCs) under bone induction condition. Methods: MSCs were isolated from adult rat by using density gradient separation method. The osteogenic inducers were compounds of Dexone, β-glycerophosphate sodium and vitamin C. Results: The MSC attachment formed soon after the seeding and grew into colonies with the appearance of fibroblastic cells. The osteogenic inducer with low dose of Dexone could promote the osteogenic differentiation of MSC.In the group of osteogenic inducer with low dose of Dexone, the expression of alkaline phosphatase (ALP) was remarkably increased after one week’s induction, and the number of positive cells was (15.1±2.6), significantly higher than that of the control group (12.0±3.5) (P<0.01). The calcified deposits began to appear in the group of osteogenic inducer with low dose of Dexone after one week's induction and was increased remarkably after three weeks, and the number of calcified deposits was (9.0±1.7), significantly higher than that of the control group (2.0±1.8) (P<0.01).Conclusion: MSC can differentiate into osteogenesis by osteogenic induction and may be used to provide seed cells for bone tissue engineering.
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