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Search Results: 1 - 10 of 162166 matches for " LI Wei "
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Stable Boundary Layer Height Parameterization: Learning from Artificial Neural Networks  [PDF]
Wei Li
Atmospheric and Climate Sciences (ACS) , 2013, DOI: 10.4236/acs.2013.34055

Artificial neural networks (ANN) are employed using different combinations among the surface friction velocity u*, surface buoyancy flux Bs, free-flow stability N, Coriolis parameter f, and surface roughness length z0 from large-eddy simulation data as inputs to investigate which variables are essential in determining the stable boundary layer(SBL) height h. In addition, the performances of several conventional linear SBL height parameterizations are evaluated. ANN results indicate that the surface friction velocity u* is the most predominant variable in the estimation of SBL height h. When u* is absent, the secondly important variable is the surface buoyancy flux Bs. The relevance of N, f, and z0 to

A Research on Undergraduate Architecture Teaching Approach Based on Integration of Architectural Design and Architectural History Teaching  [PDF]
Wei Li
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.912135
Abstract: Undergraduate Architecture Education comprises these two major aspects: architectural design teaching and architectural history teaching. Due to different philosophies on curriculum, teaching methods, architectural design teaching and architectural history teaching have been long separated, which led to a disjunction between theory and practice, authentic project and scientific research. Under such circumstances, a new teaching approach based on integration and system optimization of architectural design and architectural history is highly demanded, which is of great significance to teaching. The practice of Architecture Undergraduate Program in Huizhou University signifies an innovative path for teaching research and reform. All steps are organized in a systematic way and the mission that we commit to nurturing graduates with application and innovation is fulfilled.
An Energy-Based Stochastic Model for Wireless Sensor Networks  [PDF]
Yuhong Zhang, Wei Li
Wireless Sensor Network (WSN) , 2011, DOI: 10.4236/wsn.2011.39035
Abstract: We propose an energy-based stochastic model of wireless sensor networks (WSNs) where each sensor node is randomly and alternatively in an active and a sleep mode. We first investigate the sensor model and derive the formula of the steady-state probability when there are a number of data packets in different sensor modes. We then determine important sensor’s performance measures in terms of energy consumptions, average data delay and throughput. The novelty of this paper is in its development of a stochastic model in WSN with active/sleep feature and the explicit results obtained for above mentioned energy consumption and performance characteristics. These results are expected to be useful as the fundamental results in the theoretical analysis and design of various hybrid WSNs with power mode consideration.
Permanence and Globally Asymptotic Stability of Cooperative System Incorporating Harvesting  [PDF]
Fengying Wei, Cuiying Li
Advances in Pure Mathematics (APM) , 2013, DOI: 10.4236/apm.2013.37082

The stability of a kind of cooperative models incorporating harvesting is considered in this paper. By analyzing the characteristic roots of the models and constructing suitable Lyapunov functions, we prove that nonnegative equilibrium points of the models are globally asymptotically stable. Further, the corresponding nonautonomous cooperative models have a unique asymptotically periodic solution, which is uniformly asymptotically stable. An example is given to illustrate the effectiveness of our results.

One Sound and Complete R-Calculus with Pseudo-Subtheory Minimal Change Property  [PDF]
Wei Li, Yuefei Sui
Journal of Computer and Communications (JCC) , 2013, DOI: 10.4236/jcc.2013.15004

The AGM axiom system is for the belief revision (revision by a single belief), and the DP axiom system is for the iterated revision (revision by a finite sequence of beliefs). Li [1] gave an R-calculus for R-configurations Δ|Γ, where Δ is a set of atomic formulas or the negations of atomic formulas, and Γ is a finite set of formulas. In propositional logic programs, one R-calculus N will be given in this paper, such that N is sound and complete with respect to operator s(Δ,t), where s(Δ,t)is a pseudo-theory minimal change of t by Δ.

The Sound and Complete R-Calculi with Respect to Pseudo-Revision and Pre-Revision  [PDF]
Wei Li, Yuefei Sui
International Journal of Intelligence Science (IJIS) , 2013, DOI: 10.4236/ijis.2013.32012
Abstract: The AGM postulates ([1]) are for the belief revision (revision by a single belief), and the DP postulates ([2]) are for the iterated revision (revision by a finite sequence of beliefs). Li [3] gave an R-calculus for R-configurations |Γ, where Δ is a set of literals, and Γ is a finite set of formulas. We shall give two R-calculi such that for any consistent set Γ and finite consistent set of formulas in the propositional logic, in one calculus, there is a pseudo-revision Θ of Γ by Δ such that \"\" is provable and \"\" and in another calculus, there is a pre-revision Ξ
Inspection of Kindergarten Teacher-Children Interactions
—A Case Study in China

Jing Li, Wei Wang
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.28016
Abstract: With the purpose of improving the efficiency of teacher-children interactions and enhancing the quality of pre-school education, the writer uses 20 kindergartens in urban areas of Chongqing as samples to study the teacher-children interactions through observation. The findings show that: 1) The teacher-children interaction is unbalanced, mainly presenting as the teacher-centered “asym-metrical interdependent interactions”. Interactions initiated by the teacher and positive emotions of the children during these interactions are obviously more than those initiated by the children. 2) Interactions between the teacher and the children lack emotional depth. In the interactions, the children response less although they participate more; major methods of initiating and responding to the interactions are non-verbal actions, short or perfunctory replies; and most contents of the interactions are events without touching upon emotions.
The Empirical Study on Margin Trading and Pricing Efficiency—Evidence from Natural Experiment  [PDF]
Yafang Wei, Pinghai Li
Modern Economy (ME) , 2016, DOI: 10.4236/me.2016.71003
Abstract: Short selling mechanism was introduced in Chinese market since March 31, 2010 and has developed for five years. The relationship between margin trading and pricing efficiency is worth studying. In this paper, we focus on the expansion event of underlying stocks happened on September 16, 2013. By using event study method and panel data results, and taking the underlying stocks and other stocks before and after being allowed to the margin trading as the research objects, we reach the following conclusions: First, short-selling constraint makes stocks overvalued and hinders the response speed to messages; second, after introducing the margin trading, especially we are well into short-sale era, not only does the degree of overestimation of underlying stocks decrease, the response speed of stocks to messages improves a lot. Meanwhile we find that there exists a link between pricing efficiency and exchanges, turnover rate, circulation value.
How to Save Brand after Crises? A Literature Review on Brand Crisis Management  [PDF]
Ming Li, Haiying Wei
American Journal of Industrial and Business Management (AJIBM) , 2016, DOI: 10.4236/ajibm.2016.62008
Abstract: In recent years, brand crises are becoming increasingly prevalent in the global marketplace. Given that brand crises have many devastating effects, how to manage them effectively has become a hot topic among marketing researchers and practitioners. Based on the review of literatures concerned, this paper first analysed the concept and types of brand crises. Then this article summarized the response strategies that corporations can take during that hard time. Furthermore, this paper identified some factors that influence the effectiveness of those response strategies. Given all of this, the review highlights some promising directions for future research.
Research on Strengthening Tax Follow-Up Management and Preventing Tax Law Enforcement Risks in the Context of Simplified Administration and Power Decentralization  [PDF]
Meihong Li, Hanchun Wei
Journal of Financial Risk Management (JFRM) , 2016, DOI: 10.4236/jfrm.2016.54026
Abstract: This paper summarizes and analyzes the problems existing in the follow-up management and tax law enforcement in the context of function transformation of tax authorities, simplified administration and power decentralization, and discusses the approach to strengthen the follow-up management and prevent the tax law enforcement risk.
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