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Search Results: 1 - 10 of 89630 matches for " Liu Qiang "
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Research on Robust Control of Longitudinal Motion of SWATH
Qiang Liu
Journal of Computers , 2011, DOI: 10.4304/jcp.6.12.2706-2710
Abstract: Taking the uncertainty of SWATH longitudinal motion control system into account, the parameter uncertainty model of SWATH was built, and the -synthesis controller was designed to improve the longitudinal motion performance of SWATH. Then Matlab was utilized to simulate the controlled as well as uncontrolled longitudinal performance of SWATH. According to the simulation result, under different sailing conditions, the longitudinal motion performance of SWATH is still excellent. Therefore, the parameter uncertainty mathematical model built in this paper as well as the designed -synthesis controller are effective and applicable to improve the longitudinal motion performance and the robust performance of SWATH, providing the theoretical basis for the research on SWATH with high performance.
Research on Under-actuated Flexible Pectoral Fin of Labriform Fish
Qiang Liu
Journal of Computers , 2012, DOI: 10.4304/jcp.7.6.1393-1399
Abstract: The new propulsor, whose inspiration is from pectoral fins of fishes, has arisen increasing attention. To improve the performance of the existing labriform bionic pectoral fin, based on the structure and control mechanism of real fish pectoral fin, the under-actuated technology was utilized to design a new flexible bionic pectoral fin. Then, the kinematic model of pectoral fin during fish forward steady swimming and the dynamic model of bionic pectoral was built. Finally, Matlab was used to simulate the kinematic and dynamic performance of bionic pectoral fin. The simulation result shows that the new flexible bionic pectoral fin can imitate the propulsion motion morphology of pectoral fin during fish forward steady swimming well. However, due to the restriction of kinematic model of pectoral fin and structure as well as physical properties of bionic fin ray, there is still tolerance between the locomotion morphology of bionic pectoral fin and that of real fish. Therefore, it is necessary to develop further research on kinematic modeling of pectoral fin and bionic design of fin ray. Additionally, the new bionic pectoral fin reduces the number of the driving variables, providing the possibility and the basis of further reducing the volume as well as the complexity of bionic device of pectoral fin.
Variance Reduction Techniques of Importance Sampling Monte Carlo Methods for Pricing Options  [PDF]
Qiang Zhao, Guo Liu, Guiding Gu
Journal of Mathematical Finance (JMF) , 2013, DOI: 10.4236/jmf.2013.34045

In this paper we discuss the importance sampling Monte Carlo methods for pricing options. The classical importance sampling method is used to eliminate the variance caused by the linear part of the logarithmic function of payoff. The variance caused by the quadratic part is reduced by stratified sampling. We eliminate both kinds of variances just by importance sampling. The corresponding space for the eigenvalues of the Hessian matrix of the logarithmic function of payoff is enlarged. Computational Simulation shows the high efficiency of the new method.

The Study of 1 + X Evaluation Mode Reform  [PDF]
Tian Zhang, Man Liu, Qiang Ji
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.516163
Abstract: To solve the question of the present situation of professional education, we analyze the outstanding problems of the process, and put forward the design of content, the main measures of reform and the relationship that should be handled in the process of 1 + X evaluation mode reform, in order to adapt to the reform of the professional education, and build a scientific and reasonable system of 1 + X evaluation mode. Accordingly, we can improve the quality of teaching and talent training.
Bo Liu,Qiang Xu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809012604
Abstract: The title compound, [Zn(C14H8N2O4)(H2O)2]n, consists of zigzag chains of Zn atoms bridged by azobenzene-4,4′-dicarboxylate ligands. The ZnII atom, lying on a twofold rotation axis, is coordinated by four O atoms from the carboxylate groups and two water molecules, giving rise to a considerably distorted octahedral coordination envionment. The ligand lies on an inversion center. In the crystal structure, π–π interactions between the ligands [interplanar distance = 3.527 (3) ] assemble the chains into a sheet-like structure. O—H...O hydrogen bonds between the coordinated water molecules and carboxylate O atoms connect the sheets into a three-dimensional network.
4,4′-Bipyridine–cyclohexane-1,2,4,5-tetracarboxylic acid (1/1)
Jian-Qiang Liu
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810039024
Abstract: In the title 1:1 adduct, C10H8N2·C10H12O8, the dihedral angle between the pyridine rings in the 4,4-bipyridine molecule is 8.33 (13)°. In the crystal, the cyclohexane-1,2,4,5-tetracarboxylic acid molecules interact with each other through intermolecular O—H...O hydrogen bonds, forming an infinite chain along the a axis, which is further linked perpendicularly by O—H...N hydrogen bonds involving bipyridine, resulting in a supramolecular corrugated sheet parallel to the (110) plane.
On the Occupational Career Planning for College Secretary
Lanlan Liu,Qiang Yu
Economic Management Journal , 2012,
Abstract: With the deepening reform of higher education, the profession of being college secretary has also been standardized and improved. College secretary must formulate proper occupational career plan according to his or her own characteristcs, realize the significance and necessity of career planning, and pay attention to career orientation and initiative taking, clear stage target so as to construct a reasonable knowledge structure, develop professional capabilities, and to obtain a better and extended career.
Research on Chengdu Vegetables Marketing Based on STP Model
Qiang Liu,Xiumin Wu
Asian Social Science , 2013, DOI: 10.5539/ass.v9n4p221
Abstract: In this paper, we take the consumers in Chengdu vegetables market as samples, in the form of questionnaires and interviews, to study the consumer motivations and psychology, and make market segmentation of consumers. Results show that the consumers in Chengdu vegetables market can be divided into four types: the safety-pursuing type, the convenient and economical type, the family healthy type, and the fashionable type, among which the safety-pursuing type is the largest. Finally, authors put forward some suggestions for Chengdu vegetables market based on current conditions.
Guest Editorial
Qihai Zhou,Qiang Liu
Journal of Software , 2010, DOI: 10.4304/jsw.5.1.1-2
Abstract: With the high development of Computer Science-Technology and Applications, Computer Science-Technology as one of IT’s mainstays has become one of the today’s main important key engines, and propels the progress of global science & technology and human society. As one of a person’s feet, software technology and applications play an important role in Computer Science-Technology and Applications. This Special Issue aims to show some academic researches on recent trends and advances in software technology and applications. “New Algorithm for Indefinite Multi-objective Decision Making Based on Multiple-valued Intuitive Fuzzy Set Theory” studies an indefinite multi-objective decision making which is an interesting and important application of software technology. “Software Prepromotion for Non-Uniform Cache Architecture” proposes software prepromotion technique, which prepromote data using prepromotion instructions as similar as software prefetching does. In “A Reliable Multicast Routing Protocol for High-speed Mobile Ad Hoc Networks: R-ODMRP”, with the exploration of active network, R-ODMRP constructed the multicast routing based on the cluster, established a distributed mechanism of the acknowledgment and recovery of packet delivery. “Remote Sensing Image Sequence Segmentation Based on the Modified Fuzzy C-means” presents a remote sensing image sequence segmentation method based on improved FCM algorithm.
Spin-orbit coupling induced Mott transition in Ca$_{2-x}$Sr$_{x}$RuO$_{4}$ (0
Guo-Qiang Liu
Physics , 2011, DOI: 10.1103/PhysRevB.84.235136
Abstract: We propose a new mechanism for the paramagnetic metal-insulator transition in the layered perovskite Ca$_{2-x}$Sr$_{x}$RuO$_{4}$ (0
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