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- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- A Rössler band is presumably the simplest of all chaotic attractors. It can develop in systems with only three state variables if two of these produce an outward spiralling trajectory, and the third folds this trajectory back towards its center when the amplitude of the expanding oscillation becomes sufficiently large. In the present paper we show how Rössler bands can develop through slight modifications of well-established economic and biological models.
-
- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- A system dynamics model is presented in this paper along with the results of some policies and their consequences automation. The automation seems to be the answer for faster growth and development throughout the world whether or not there is excessive labor or its shortage in a nation. Higher productivity, lower costs, better quality of products and services, remaining competitive and new innovations are benefits of automation and they are very important factors in industrialization and as well in sustaining the jobs in the long run. Very often, particularly in the developing countries, the politicians either exploit or in most cases misunderstand the total effects of automation and computerization. In India, for example, computerization of even very important services like airlines and trail reservations, insurance and banking have suffered due to political decisions for two decades. Only recently they have realized their mistakes and are trying to catch up. This simple system dynamics model can be easily used for systems analysis to study the effects of automation and thus can help in making strategic decisions in automation and policy guidelines formulations.
-
- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- There is growing interest in combining system dynamic models with conventional case studies in order to create learning environments for management education. Such computer-based case studies promise improvement in strategic thinking skills and better integration of modeling in the policy and strategy area. Moreover, these models-with-cases are tangible products with which to conduct research in computer-based learning. This paper surveys the opportunities for using computer-based case studies in management education and for conducting novel research on management learning.The paper first examines how models-with-cases fit in the established areas of strategic management and business policy. Which issues, in the broad range covered by strategic management, do models-with-cases address? Next, two current examples of computer-based case studies are presented (People Express Airlines and Intecom PBXs) to show explicitly how cases and models are combined and used. Finally, the paper explores research questions that arise in conjunction with such work; 1) how to teach effective inquiry skills, 2) how to teach conceptualization skills, 3) how to enhance the ability to apply learned theories to new situations, and 4) adapting measurement methods to evaluating the educational effectiveness of computer-based cases in teaching these mental skills.
-
- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- The Cyclades, a group of over thirty dispersed islands in the middle of the Aegean Sea can become a case study for energy-driven regional development. High cost, low reliability and scarcity of energy have significantly contributed to the underdevelopment of the region. There is a lack of local conventional energy sources, but the potential of renewable energy sources, namely geothermal, wind and solar is many times greater than the region's energy needs.The Energy Policy Unit has constructed an Energy Plan for Cyclades up to the year 2000 concerning the development of local economic resources in connection with programmes promoting the exploitation of local energy potential. New energy investments, mainly in the renewables and energy saving options were examined in detail. For this reason, consistent alternative scenarios of energy supply, energy demand and economic growth were developed and assessed through an integrated modelling system. In this paper, the emphasis will be placed on the energy supply model.
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- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- In recent years the way in which problems are approached in the assembly area within the manufacturing firm has gained increasing importance for economic planning. In connection with this, the demand for long term economic flexibility of assembly systems comes to the forefront. A firm should not limit itself purely to investment decisions in the planning of assembly systems, if it is to successfully meet growing demand (on both the market and technology fronts). However, it has become essential even in this field that strategic thinking and planning are considered more important than they have been in the past.There are considerable difficulties, however, associated with the strategic decision-making processes involved in the planning of flexible assembly systems. System Dynamics assembly models are currently being developed at the Business Management Institute at Stuttgart University ( within the framework of the “Sondereforchungsbereich 158” sponsored by the DFG).The aim of this is to understand and cope with these problems more easily, with specific reference to long-term decisions, the lacking objective assessment criteria and the high complexity of the problem.
-
- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- The System Dynamic National Model was undertaken to show how local policies governing decentralized decisions in an economy create observed overall economic behavior. I feel we have succeeded well beyond our original expectations. The model, endogenously, without any external driving time series, generates the major observed modes of economic behavior: business cycles, inflation, the economic long wave and growth.
-
- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- We have modeled the highly non-linear dynamic phenomena which arise in Gunn diodes by interaction between the internally generated domain mode and an external microwave signal. As the frequency of the microwave signal is changed, a devil's staircase of frequency-locked oscillations develops, interspersed with quasiperiodic solutions. Period- doubling and other forms of mode-converting bifurcations can be seen in the interval of some of the steps. At higher microwave amplitudes, deterministic chaos arises. The transitions to delayed, quenched, and limited space charge accumulation modes are followed.
-
- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- Rapidly growing cities cause inadequate transformation in the use of land. Government policies tend to be obsolete shortly after implementation, supply of basic services becomes insufficient and expensive, and food prices tend to increase. All these factors are certainly the case in many developing countries where large amounts of population often migrate to settle down, sometimes in dangerous or unhealthy locations, but other times in areas suitable for agricultural purposes in the periphery of the city.The land surrounding the metropolis enters a transitional stage. The territory becomes uneconomical for rural exploitation, but it requires to be supplied with basic services for urban housing. The System Dynamics approach is then appropriate to study and plan these unstable systems.This paper presents a model to assess the growth of peripheral districts of the city. It is a useful aid for policy making in land use issues and a good tool for planning basic services such as health, schooling, transport and recreation.A simulation is carried out for the Periurban District of El Corazon in Medellin, Columbia. A good approximation between historical data and model results can be appreciated. Some scenarios of future growth are explored and the consequence of land-use policies are confronted.
-
- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- The use of gaming to study contemporary warfare has evolved rapidly in recent years. Particularly important strides were taken during the 1960's and 1970's with advances in computer technology and the development of broader ranges of subject matter. The past two decades have seen a tremendous expansion in the role and influence of computer models as “policy assisting” devices – first in the analysis of national security issues, and now for the analysis of problems arising throughout the entire affairs of Government.
-
- Type:
- Document
- Date Created:
- 1989
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 229aea09844305a482784be9fca550ff, 23d738ba88f8333bc39725f9cb5bd0b8, and a656a490ae4bb95659d385b98804153f
- Description:
- The purpose of this paper is to show some of the schemes used by systems researchers and consultants to collect data about their clients' perceptions of problem situations. These various schemes--which use both words and graphics, consisting more or less of curved lines and arrows-- are useful for 1. helping clients express their perception of a problem situation 2. organizing clients' thinking 3. helping to overcome traditional rivalry between individuals and between groups 4. helping “to create a consensus and commitment to action in a team” (Eden, 1988,2).My paper will discuss three such schemes, proceeding from the 'soft' systems methodology (Checkland, 1981); then 'cognitive mapping' (Eden, 1988); and finally, two system dynamics studies dealing with health care systems.