The modern researches on physiology verify that there are close relationships between central nervous system (CNS) and autonomic nervous system (ANS) and some autonomic functions can be regulated by CNS to some extent. In this paper, the mechanisms of cardiovascular system, especially of BP regulation, under CNS control are researched. A blood circulatory system dynamic model is established and applied practically to treatment of hypertensives trained with biofeedback technique, in which pulse transit time (PTT) is employed as an indirect index of BP change. The result shows that the curative effect of this method is efficient for BP control.
This paper is based on the historical and current situation of rural socio-economic development of a provincial lake area. At present, economic development of the lake area is considerably lag behind. Meanwhile, there exist rich natural resources and hidden unemployment of rural population. By describing the several facets of difficulty facing the lake area, the author addresses the issue of adjusting industry structure of the entire lake area, upon which the System Dynamics approach is employed in modeling and policy analysis.The System Dynamics Model of the lake area rural socio-economic development consists of 8 sub-models, which are farming, fishery, animal husbandry, rural industry, forestry and side- occupation, energy, water conservancy and population. By simulating and analysing, policy recommendations are set force.
Since the Third Plenary Session of the Eleventh Central Committee of the CCP, there have been great achievements in the development of economy in our country and the living standard of the people has been raised year by year. However, at this moment of the great boom, there appeared two protound contradictions in the macroeconomy: One is the investment hanger and the other is the consuming expansion. This is a universal persistent ailment in developing cotries.
This paper discusses the application of System Dynamics approach to the study of local education development planning which fosters a tentative SD model applicabl to local education development strategy and policy analysis in the urban area of Shanghai. It can help decision making of the local government education authorities in this area. Based on education economic theory and the socio-economic development situation in Shanghai, this model, using DYNAMOIII language, contains four socio-economic sectors – education, economic, social structure and social life, from which 730 variables were attained with 90 level equations 179 rate equations.The present study shows that the simulation model is not only feasible and practical for the study on local education system in Shanghai, but also applicable and useful to other urban areas as well.
The confliction between the need of R&D expenditure and the limitation of R&D resources in certain time period is a serious issue facing both developing and developed countries. This paper deals with not only the mechanism of interaction between R&D, economy and education systems, also the mechanism and relation among basic research, applied research and development. Two system dynamics models were developed focusing on the above two problems respectively. And, through modeling and policy analysis, some new findings, such as the proper scale and growth-rate of national R&D expenditure, the relation between technology acquisition and self-developing R&D, the proper ratio of R&D expenditure, etc., were accomplished.
The systems of oil and engine production of our complete planned economy before 1979 and market economy guided by planned economy after1980 are simulated and some conclusions are given in these models.The complete planned economy can't meet the national requiment for oil and engines and the market economy guided by planned economy can develop equilibrumly under the instruction of mixed policies applied to the production of oil and engines.The main items of microeconomics are simulated and some useful plots and conclusions are given. Further study of many fields of macroeconomics and microeconomics is expected.
System dynamics modeling has been applied in a wide variety of areas. However, as a means of simulating models in computers, there is no any general DYNAMO compiler system that can be used in various types of computer. The purpose of this paper is to deal with a general compiler software system ZU-DYNAMO, which is used to simulate models in various types of computer with outputs in English or Chinese. Being different from traditional method, a new idea suggested in this paper is the selection of C language instead of assemble language as objective code. The aim of such selection is to make ZU-DYNAMO independent on a particular computer. The overall structure and design principle of the system are presented. The algorithms and techniques used in the system, and the structure of objective code are designed and analysed. The description of extensions of Arrays, FOR card, etc. and the ways to implement them are also given.
In this paper we use system dynamics approach to build a policy lab focusing on the exploitation and protection of the rural resources in a southern province of China at first. Then we proceed, after validating the model thoroughly, model-based policy analyses.
By means of the system dynamics theory and approach, A system dynamics model of the forest industry system for certain area is set up, and the future developing tendency of the forest industry system, under the conditions of various developing strategies and policies, is discussed quantitatively using the computer simulation based on the model. This model can provide scientific basis for making a long-term programme for the developing of the forest industry system.
This paper presents a system dynamics model of China's industrial and investment structures. The dynamic behavior of the two structures has been analyzed in the change of demand and supply structure. The model has given special concern to China's limited resources and their allocation to different industries. A resource allocation mechanism is developed and the external robustness of the model is examined to test the control of the resources allocation system.