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Search Results: 1 - 10 of 66891 matches for " Lu Zhou "
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A Novel Efficient Mode Selection Approach for H.264  [PDF]
Lu Lu, Wei Zhou
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.35053
Abstract: H.264 video coding standard introduces motion estimation with multiple block sizes to achieve a considerably higher coding efficiency than other video coding algorithms. However, this comes at the greatly increased computing complexity at the encoder. In this paper, a method is proposed to eliminate some redundant coding modes that contribute very little coding gain. The simulation results show that the algorithm can remarkably decrease the complexity at the encoder while keeping satisfying coding efficiency.
Risk Evaluation of Dynamic Alliance Based on Fuzzy Analytic Network Process and Fuzzy TOPSIS  [PDF]
Xiaoguang Zhou, Mi Lu
Journal of Service Science and Management (JSSM) , 2012, DOI: 10.4236/jssm.2012.53028
Abstract: Dynamic alliance formations have increased dramatically over the past decade for its adaptation to environmental change and market competition. However, many fail, while an even greater proportion perform poorly. The risk analysis of dynamic alliance will help enterprises to choose a coalition partner and make a reasonable benefit allocation plan. It’s also good for reducing the risk and keeping the stability of the alliance. Based on the interaction and feedback relationships between criteria and/or indices, an index system for evaluating the risk of dynamic alliance is developed. With the information uncertainty and inaccuracy being considered, a new hybrid model based on fuzzy analytic network process (FANP) and fuzzy technique for order performance by similarity to ideal solution (TOPSIS) is proposed. The local weights of criteria and indices are obtained by fuzzy preference programming (FPP), and the comprehensive weights are derived by FANP. According to fuzzy TOPSIS, an optimal alternative is chosen by the closeness coefficient based on the shortest distance from the positive and the farthest distance from the negative ideal solutions. Finally, a numerical case is given by the proposed method.
Risk Correlation Based on Time-Varying Copula Function and Extreme Value Theory  [PDF]
Xinlong Ji, Lu Zhou
Theoretical Economics Letters (TEL) , 2017, DOI: 10.4236/tel.2017.77151
Abstract: The dependence structure of financial assets in financial risk measurement is very important, the tail relations in particular. Authors of extant studies in this field tended to focus on the linear analysis of the financial assets, rarely considering nonlinear, asymmetric and thick-tail characteristics. Here, we apply the copulas connection function with time-varying factors to discuss the risk dependency relationship between financial assets. Moreover, we develop an SV-EVT model to fit variables’ marginal distribution combined with stochastic volatility and extreme value theory. Finally, we present an empirical comparative study of static and dynamic copula models applied to the sample comprising of the Chinese mainland A-shares and Hong Kong stock market. The results show that the CSJC copulas connection function describes the tail features of stock index better than the normal copulas connection function. Similarly, the time-varying model outperforms the static copulas model. Furthermore, we observe an asymmetry dependence change rule between Chinese mainland A-shares market and the Hong Kong stock market; the correlation of lower tail is significantly higher than that of the upper tail, and the bear market effect is remarkable. These findings indicate that time-varying Copulas-SV-EVT model can depict the correlation of financial asset tails exactly, and can thus be used to control investment risk and forecast abnormal fluctuations.
Construction of Virtual Information Center in Scene Disposition of Unexpected Public Emergency Events  [PDF]
Jing-Xin Zhou, Tao Lu
iBusiness (IB) , 2011, DOI: 10.4236/ib.2011.31009
Abstract: Unexpected public emergency events have occurred frequently in recent years. How to deal with these events quickly and efficiently has become an important issue. First, the paper describes the importance of information in scene management of unexpected public emergency events, then points out the weaknesses and shortcomings of current emergency plans. After that a model of virtual information center for unexpected public emergency events is proposed. Finally, the paper describes how to build a virtual information center for assisting emergency work by a case.
Possible Metformin-Induced Toe Nails Disorder  [PDF]
Min Lu, Ying Zhou, Yimin Cui
Pharmacology & Pharmacy (PP) , 2013, DOI: 10.4236/pp.2013.43039

The aim of this article was to report a case of toe nails disorder associated with metformin use in an elderly patient with type2diabetes. Two years ago, after receiving metformin 0.5 g three times daily for 6 months, a 60-year-old Chinese man found his ten toe nails gradually thickened and yellowed (especially two thumbs). The symptoms improved and recovered after metformin discontinuance. Half year ago, metformin 0.5 g three times daily adopted again and toe nails disorder occurred again. Physician modified the therapy plan and replaced metformin with acarbose to control blood glucose level of this patient. According to the follow up 3 months after his discharge, ten toe nails recovered significantly and new parts of the nails were normal. Nail disorder was rarely reported in the worldwide, but the physicians should keep awareness of this adverse drug reaction (ADR), proper actions should be taken once it occurred to avoid unnecessary suffering of the patient.

In Vitro Immersion Behavior of Cold Sprayed Hydroxyapatite/Titanium Composite Coatings  [PDF]
Lin Lu, Xuan Zhou, P. Mohanty
Journal of Biosciences and Medicines (JBM) , 2014, DOI: 10.4236/jbm.2014.22002

In previous study, dense and homogenous 20wt% HAP/Ti composite coatings were successfully deposited on Ti substrates by cold gas dynamic spray technique. The results revealed that the phase composition of the HAP in the deposit is identical to that of the precursor powder and the bonding strength of the deposit is comparable/better to that of the plasma sprayed HAP. A relatively higher corrosion current of HAP/Ti composite than that of pure Ti coating in simulated body fluid indicates a good bioactivity for composite coating. In the present study, in vitro immersion test is carried out for various period of time and the formation of apatite layer on surface of composite coating proves the good bioactivity of the composite coating further. The cold sprayed HAP/Ti composite can be anticipated to be a promising load-bearing implant material for biomedical applications.

The Method for Measuring the Loop Resistance and the Temperature Rise Calculation of GIS Conductor Pole  [PDF]
Li Zhou, Tiecheng Lu, Bo Zhang
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.34041

This paper studies the method for measuring the loop resistance of GIS conductor pole based on the super capacitor producing impulse current up to several thousand amperes. This method overcomes the limitations of conventional diagnostic method. Typical GIS conductor poles are chosen. Based on FEA and lab tests, the effect of different forms of current and contact condition, relationship between the temperature of contact and the loop resistance is researched. In full- scale testing under realistic operating conditions on the new 220 kV GIS using prototype instrumentation a very good sensitivity in an early stage was obtained.

Introduction to China’s Green Finance System  [PDF]
Huan Peng, Xiaoqing Lu, Chaobo Zhou
Journal of Service Science and Management (JSSM) , 2018, DOI: 10.4236/jssm.2018.111009
In China, green finance has become a bright spot in the development of the financial industry. The pace of building a green financial system is accelerating. Relevant systems are gradually being established and perfected. China’s green finance business has achieved initial development in the past decade. Some policies such as green credit, green insurance and green securities have been issued one after another. This paper analyzes the current situation of China’s green financial system, the problems encountered in developing green finance and how to develop green finance better.
Optimization of coarse-grained models: matching probability density in conformational space
Shijing Lu,Xin Zhou
Physics , 2009,
Abstract: Coarse-Graining (CG) models are low resolution approximation of high resolution models, such as all-atomic (AA) models. An effective CG model is expected to reproduce equilibrium values of sufficient physical quantities of its AA model, which requires to match the equilibrium probability density of the CG model to that of the AA model in conformational space. The present work proposes for constructing effective CG models a novel methodology that aims at minimizing the distance between CG model and AA model. The distance is defined as a functional of conformational probability densities in CG and AA models and further expanded by ensemble averages of a set of sufficient and independent basis functions. An orthogonalization strategy is adopted to get the independent basis functions from sufficiently preselected interesting physical quantities of the system. Two variational methods are developed to optimize parameters of effective CG force field by minimizing the functional of probability densities, are then generalized so that the CG model also reproduce the pressure of AA model. The general CG framework is verified in constructing one-site CG water from TIP3P water model.
Coherently manipulating flying qubits in a quantum wire with a magnetic impurity
Lan Zhou,Jing Lu
Physics , 2010, DOI: 10.1140/epjb/e2010-00088-3
Abstract: e study the effect of a magnetic impurity with spin-half on a single propagating electron in a one-dimensional model system via the tight-binding approach. Due to the spin-dependent interaction, the scattering channel for the flying qubit is split, and its transmission spectrum is obtained. It is found that, the spin orientation of the impurity plays the role as a spin state filter for a flying qubit.
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