Sun Z.,Tianjin University |
Sun Z.,Tianjin University of Finance and Economy |
Ma J.,Tianjin University
Nonlinear Dynamics | Year: 2012
This paper considers a Bertrand model based on nonlinear demand functions which are closer to reality and different from previous studies. We apply the model into Chinese cold rolled steel market and study game process of triopoly. By using the theory of bifurcations of dynamical systems, local stable region of Nash equilibrium point is obtained. Simulations show complex dynamical behaviors of the system. The results illustrate that altering the relevant parameters of system can affect the stability of Nash equilibrium point and cause chaos to occur, and the complex dynamical behaviors will disappear by parameters control method. The results have an important theoretical and practical significance to Chinese cold rolled steel market. © 2011 Springer Science+Business Media B.V.
Ma J.,Tianjin University |
Ma J.,Tianjin University of Finance and Economy |
Pu X.,Tianjin University |
Pu X.,Tianjin University of Finance and Economy
Nonlinear Dynamics | Year: 2013
This paper details the research of the Cournot-Bertrand duopoly model with the application of nonlinear dynamics theory. We analyze the stability of the fixed points by numerical simulation; from the result we found that there exists only one Nash equilibrium point. To recognize the chaotic behavior of the system, we give the bifurcation diagram and Lyapunov exponent spectrum along with the corresponding chaotic attractor. Our study finds that either the change of output modification speed or the change of price modification speed will cause the market to the chaotic state which is disadvantageous for both of the firms. The introduction of chaos control strategies can bring the market back to orderly competition. We exert control on the system with the application of the state feedback method and the parameter variation control method. The conclusion has great significance in theory innovation and practice. © 2013 Springer Science+Business Media Dordrecht.
Qin J.-J.,Tianjin University of Finance and Economy
5th International Conference on Logistics and Supply Chain Management 2015 | Year: 2015
This paper consider inventory model of the perishable products with expiration date, under demand dependent on price and credit period and credit risk and. First, the inventory model with three cases was constructed; secondly, to maximize profit per unit time as the goal, solve the retailer's optimal inventory, commercial credit and pricing decisions. For any given period and the price, prove not only the existence of the optimal replenishment policy and is unique. Finally, Matlab is used to solve the global optimal replenishment strategies and commercial credit policies.
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.
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.
Wu B.,University of Nottingham |
Zhang L.,Tianjin University of Finance and Economy
Agriculture and Human Values | Year: 2013
Farmer innovation diffusion (FID) in the developing world is not simply the adoption of an innovation made by farmers, but a process of communication and cooperation between farmers, governments, and other stakeholders. While increasing attention has been paid to farmer innovation, little is known about how farmers' innovations are successfully diffused. To fill this gap, this paper aims to address the following questions: What conditions are necessary for farmers to participate in FID? How is a collaborative network built up between farmers and stakeholders for this purpose? And what roles can government play? The above questions are addressed through analysis of the diffusion of winter greenhouse technology in China. A framework for analyzing a FID system is developed, and the conclusion is drawn that building mutual trust and collaborative networks is crucial for the success of FID. Furthermore, this network building can be broken down into various levels with different scales, speeds and consequences for FID: informal networks among farmers themselves, farmer-led networks, and government-facilitated networks. The success of government intervention depends upon building and enhancing the collaborative networks in which farmer leadership is crucial. © 2013 Springer Science+Business Media Dordrecht.
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.
Liu J.,Tianjin University of Finance and Economy |
Shen Z.,Economic and Planning Research Institute
Energy Procedia | Year: 2011
Some commercial banks in China active in the implementation of green credit policy, got remarkable results. Some local governments actively promote on the progress of the green credit policy. However, many problems encountered in the implementation of low carbon finance in China. In the future, China is going to actively develop a strategic planning of low-carbon finance development, improve the legal framework for financial supervision, regulate the development of carbon finance, foster low-carbon financial innovation mechanism, innovate and develop a variety of low-carbon financial instruments, improve low carbon financial intermediation services to carry out low-carbon finance, actively promote an international carbon trading process of the renminbi-denominated. © 2011 Published by Elsevier Ltd.
Tan S.,Tianjin University of Sport |
Li W.,Tianjin University of Finance and Economy |
Wang J.,University of Southern Queensland
Journal of Sports Science and Medicine | Year: 2012
This study evaluated the effects of a 6-month combined aerobic and resistance training program on the body composition, glycemic control, lipid profile, and functional capacity of older patients with a long history of type 2 diabetes. 25 subjects (65.9 ± 4.2 yrs; M/F: 13/12) with a long history of type 2 diabetes (16.7 ± 6.7 yrs) were randomly allocated into either the exercise or control groups. The exercise group trained three sessions a week. Each session consisted of a warm-up period, 30 minutes of moderate aerobic exercise, 10 minutes of resistance training with five leg muscle exercises (two sets of 10-12 repetitions at 50-70% of 1RM for each activity), and a cool-down period. The variables of body composition, glycemic control, lipid profile, and functional capacity were measured before and after the study period. Exercise training decreased waist-hip ratio and body fat of the trained subjects. Concentrations of fasting and 2- hour post-glucose challenge plasma glucose and serum insulin, and glycosylated hemoglobin decreased significantly in the exercise group. Exercise training improved the lipid profile and also increased the leg muscle strength and 6-minute walking distance of the trained subjects. The control group, however, increased their body fat and fasting plasma glucose, while other variables were not changed during the study period. The current results demonstrate that elderly patients with a long history of type 2 diabetes can benefit from the 6-month combined aerobic and resistance training program. © Journal of Sports Science and Medicine (2012).
Liu X.,Tianjin University of Finance and Economy
Energy Procedia | Year: 2011
With the rapid development of economy in China, the issue is increas ingly serious involving the degradation of environment, the shortage of resource and the absence of environmental protection. To keep sustainable development of economy, this paper illustrates stimulating function of tax policy involving in environmental prot ection, energy-saving and emission-reducing from aspect of encouraging technology innovation. Furthermore, it put s forward policy orientation including further improving tax to support energy -saving and emission-reducing and independent innovation with the analysis of existing tax policy on environmental protection, energy-saving and emission-reducing. © 2011 Published by Elsevier Ltd.