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Ma J.,Tianjin University | Ma J.,Tianjin University of Finance and Economy | Bangura H.I.,Tianjin University
Nonlinear Dynamics | Year: 2012

This paper studies the characteristics of a series of complex systems, which are in combination of interest rate, investment, and price index parameters meeting the condition c - b - abc ≥ 0, including stable node, saddle points, bifurcation, Hopf bifurcation, and chaos, and the corresponding mathematical expressions of Lyapunov index are given. Based on this, we perform complexity analysis of the system and study the change circumstances of Lyapunov index when one or two parameters synchronously change. Numerical simulation results verify the theoretical analysis and conclusion. The results of this economic and financial system provide reference to practical problems, and have a positive effect on the actual application of the system of this type. © Springer Science+Business Media B.V. 2012. Source


Ma J.,Tianjin University | Sun Z.,Tianjin University | Sun Z.,Tianjin University of Finance and Economy
Nonlinear Dynamics | Year: 2013

Based on a detailed analysis of the international market, we establish a decentralized dynamics model to describe the situation that a new oligarch wishes to enter into a market which has been occupied by two oligarchs, so they have different decision rules. Then we establish and analyze the corresponding continuity system, and in detail discuss the Lyapunov exponent of this system, studying the influence of the parameter's change to the Lyapunov exponent in three situations. Proceeding to the next step, we make the analysis of the complex dynamics behavior, such as Hopf bifurcation, chaos attractor and initial sensibility. We make a numerical simulation under different conditions, and the result shows that the process of game will tend to a Nash equilibrium at a lower price adjustment speed, and with the increase of the value, the system will appear to be unstable and go into a chaos state gradually. However, for the new entrant, the influence of chaos is not huge, and the new entrant can be seen as a stable element in the chaotic market. The research leads to a good guidance to the market with a new entrant to do the best decision-making. © 2012 Springer Science+Business Media Dordrecht. Source


Qin J.,Tianjin University of Finance and Economy
Advances in Information Sciences and Service Sciences | Year: 2012

In the supply chain with the manufacturer and two competing retailers, discuss the three supply chain buy-back modes focusing on the consumer's strategic returns from the point of the manufacturers: the manufacturers repurchasing the return products through the retailers; the manufacturers repurchasing the return products directly; the asymmetric return repurchasing mode. By analyzing the three models, the manufacturers' and two retailers' optimal decision and the optimal profits are obtained, which provides the suggestions for the members to choose the right supply chain buy-back mode. The results show that: in the different buy back mode, the players' profits in the supply chain are different; the choice of the buy back modes depends on the consumers' return rate, the proportion of the customers choosing to return and the repurchasing price, but the asymmetric buy back mode is non-optimal mode. Finally, the numerical analysis strongly supports the conclusions in the paper. Source


Qin J.,Tianjin University of Finance and Economy
Research Journal of Applied Sciences, Engineering and Technology | Year: 2012

The purpose of this study is to determine the optimal retailer's replenishment policies considering the customers' bad debt and delayed payment in the three-stage supply chain with the dominant retailer. The effect of bad debt is analyzed on the interest earned and interest charged to build the models of the retailer's decision in two cases. By analyzing the model, the retailer's optimal replenishment time and the optimal order quantity are obtained. Furthermore, analyze the effect of parameters on the retailer's optimal order policies. Finally, the numerical analysis is presented to demonstrate the conclusions. The results show that the delayed payment offered by the manufacturer becomes large, the retailer's optimal order cycle and the optimal order quantity increases or remains the same; When the delayed payment time offered by the retailer decreases, the retailer's optimal order cycle and the optimal order quantity increases or remains the same. When the fixed ordering cost is reduced, the retailer's optimal order cycle and the optimal order quantity decreases or remains the same. When the charged interest is greater than the earned interest, with the bad debt rate increasing, the retailer's optimal order cycle and optimal order quantity is converged to a certain value. © Maxwell Scientific Organization, 2012. Source


Hou X.,Tianjin University of Finance and Economy
Energy Procedia | Year: 2011

Build the Library Evaluation Index System of the universities in Tianjin. This paper describes the principal factors which needs to be considered of the build of University Library in Tianjin through the structure of Social, economic , service benefits, and the other 12 Level 3 indicators which are relate to them. These Indicators of the index weight of the actual and reasonable, and it evaluated the overall efficiency of the library with the establishment of the model of GEM. © 2011 Published by Elsevier Ltd. Source

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