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Search Results: 1 - 10 of 127557 matches for " Jianping Li "
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Improved Quantum-Behaved Particle Swarm Optimization  [PDF]
Jianping Li
Open Journal of Applied Sciences (OJAppS) , 2015, DOI: 10.4236/ojapps.2015.56025
Abstract: To enhance the performance of quantum-behaved PSO, some improvements are proposed. First, an encoding method based on the Bloch sphere is presented. In this method, each particle carries three groups of Bloch coordinates of qubits, and these coordinates are actually the approximate solutions. The particles are updated by rotating qubits about an axis on the Bloch sphere, which can simultaneously adjust two parameters of qubits, and can automatically achieve the best matching of two adjustments. The optimization process is employed in the n-dimensional space [-1, 1]n, so this approach fits to many optimization problems. The experimental results show that this algorithm is superior to the original quantum-behaved PSO.
Quantum-Inspired Neural Networks with Application  [PDF]
Jianping Li
Open Journal of Applied Sciences (OJAppS) , 2015, DOI: 10.4236/ojapps.2015.56024
Abstract: In this paper, a novel neural network is proposed based on quantum rotation gate and controlled- NOT gate. Both the input layer and the hide layer are quantum-inspired neurons. The input is given by qubits, and the output is the probability of qubit in the state . By employing the gradient descent method, a training algorithm is introduced. The experimental results show that this model is superior to the common BP networks.
Board Advising, Risk-Taking, and Firm Performance  [PDF]
Jianping Li
Journal of Financial Risk Management (JFRM) , 2016, DOI: 10.4236/jfrm.2016.53015
Abstract:
The corporate risk-taking has caught public attention due to the global financial crisis. Using a sample of listed companies in China from 2008 to 2015, this paper investigates how the role of board advising affects corporate risk-taking and the possible economics consequences of risk-taking. The empirical results show that the percentage of advisory directors is positively associated with the level of corporate risk-taking, and the interaction of the percentage of advisory directors and risk-taking is positively correlated with the future firm performance. However, these effects are not significant at all in the state-owned enterprises due to government’s interference.
The Maximum Hamilton Path Problem with Parameterized Triangle Inequality  [PDF]
Weidong Li, Jianping Li, Zefeng Qiao, Honglin Ding
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.51B022
Abstract: Given a complete graph with edge-weights satisfying parameterized triangle inequality, we consider the maximum Hamilton path problem and design some approximation algorithms.
Operator constraint principle for simplifying atmospheric dynamical equations
Jianping Li,Jifan Chou
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03183558
Abstract: Based on the qualitative theory of atmospheric dynamical equations, a new method for simplifying equations, the operator constraint principle, is presented. The general rule of the method and its mathematical strictness are discussed. Moreover, the way that how to use the method to simplify equations rationally and how to get the simplified equations with harmonious and consistent dynamics is given.
Global analysis theory of climate system and its applications
Jianping Li,Jifan Chou
Chinese Science Bulletin , 2003, DOI: 10.1007/BF03184222
Abstract: The idea and main theoretical results of the global analysis theory of climate system are briefly summarized in this paper. A theorem on the global behavior of climate system is given, i.e. there exists a global attractor in the dynamical equations of climate, any state of climate system will be evolved into the global attractor as time increases, indicating the nonlinear adjustment process of climate system to external forcing. The different effects of external forcing, dissipation and nonlinearity on the long-term behavior of solutions are pointed out, and some main applications of the global analysis theory are also introduced. Especially, three applications, the adjustment and evolution processes of climate, the principle of numerical model design and the optimally numerical integration, are discussed.
Mechanism of stratospheric decadal abrupt cooling in the Early 1990s as influenced by the Pinatubo eruption
Dong Xiao,JianPing Li
Chinese Science Bulletin , 2011, DOI: 10.1007/s11434-010-4287-9
Abstract: Studies have suggested that one volcanic eruption can influence seasonal to inter-annual climate variations. This study indicates that the Pinatubo eruption in 1991 may have actually induced the stratospheric decadal cooling recorded in the early 1990s. Using the NCEP/NCAR reanalysis and TOMS/SBUV satellite data, a decadal abrupt cooling of stratospheric tropical air temperature was found to have occurred in the early 1990s during a long-term descending trend. We generated the spatio-temporal structures of the decadal abrupt changes (DACs) for the stratosphere, and explored the relationship between the Pinatubo volcano eruption in 1991 and stratospheric DACs in the early 1990s. Our results suggest that the eruption of Pinatubo prompted a decadal decrease of ozone by the activation of nitrate and sulfate volcanic aerosols on ClO free radicals. The stratospheric heat absorbed by ozone decreased over a decadal time scale. As a result, decadal abrupt cooling of stratospheric tropical air temperatures occurred in the early 1990s, and may be attributed to the Pinatubo eruption. The results therefore indicate that one strong volcanic eruption can induce stratospheric decadal climate variation.
Computational stability of the forced dissipative nonlinear atmospheric equations
Jianping Li,Jifan Chou
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885073
Abstract: A new concept of computational quasi-stability (CQS) is introduced to study the computational stability (CS) of the forced dissipative nonlinear (FDN) evolution equations. Based on the concept, the CQS criterion of difference scheme of FDN atmospheric equations is obtained. So it provides the theoretical basis for designing the computational stable difference scheme of FDN atmospheric equations.
Dynamical analysis on splitting of subtropical high-pressure zone
Jianping Li,Jifan Chou
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02884143
Abstract: Based on two simple dynamical models, the preliminary dynamical analysis of the splitting of subtropical high-pressure zone (SHPZ) without land-sea contrast and orographic effect is investigated. Results show that the splitting of SHPZ may be an intrinsic attribute of the earth rotation atmosphere.
Time Slot Assignment for Maximum Bandwidth in a Mobile Ad Hoc Network
Jianping Li,Yasushi Wakahara
Journal of Communications , 2007, DOI: 10.4304/jcm.2.6.56-64
Abstract: Time slot assignment is essential to provide the calculated bandwidth in a TDMA (Time Division Multiple Access)-based mobile ad hoc network (MANET), which is a focus of attention of this paper because of its collision-free packet transmission with QoS(Quality of Service) support. In this paper, a new time slot assignment algorithm-SAGO (Slot Assignment by Global Overview) is proposed, by which more available bandwidth can be obtained than conventional approximate solutions. SAGO assigns time slots from a global overview, that is, time slot assignment is based on the usage of global information such as finding of bottleneck of a route, tentative bandwidth evaluation of a route and assignment of time slot according to the order of their free times in the concerned links. In addition, SAGO’s effectiveness is proved by simulation results.
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