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- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- This study presents a system dynamics framework to model the Information Technology Institute (ITI) e-material supply chain as a case study of digital product supply chain. This e-material supply chain serves a foundation of providing e-learning programs. The aim of this study is to understand the dynamic structure of this e-material supply chain and hence suggest and evaluate possible policies to enhance its current performance. The first section is an overview of the e-material supply chain. The second defines the problem with the ITI e-material supply chain. The third section is for literature review. The fourth describes the model and the fifth discuss the model behavior. A list of suggested policies is evaluated to increase the e-material supply chain performance and decrease the associated costs in the sixth section. In the last section we conclude.
-
- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- The previous work related to eigenvalue analysis in the system dynamics field, focused on linking the model structure to the modes of behavior -- i.e. the eigenvalues. While the system eigenvalues define the characteristics of the systems behavior modes (e.g., exponential growth, expanding oscillations), these behavior modes are not equally represented in all model variables, making it difficult to link the behavior of the reference mode to the behavior of a particular variable. In this study we propose an alternative perspective and explicitly explore the significance that each behavior mode has on the system state variables. We achieve this by decomposing the behavior of a variable into a sum of the weighted reference modes in the system (represented by the eigenvalues). We argue that focusing on the weights, rather than on the eigenvalues, is a more efficient way to develop policy recommendations and compute the elasticity of the weights to the gain on any link the model allowing for a more efficient and discriminate way to identify policies. A routine to estimate the weights of any linear model and compute the elasticity of those weights to model links is developed and made available at http:// iops.tamu.edu/faculty/roliva/research/sd/.
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- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- This paper presents our experience in training middle managers from Egyptian Governmental organizations on system dynamics (SD) as a part of the Egyptian educational organizations efforts to increase managerial skills and raise business viability. A step-by-step feedback-teaching method is employed. We prepare a module of the material; teach it on a small sample to get feedback to further enhance the quality of the material developed. The paper starts with a discussion on the need for this course. It then gives a brief on the "Innovations in Professional Training in Egypt" project funded by Tempus Programme. The paper discusses the course preparation process and the students' feedback regarding the system dynamic education offered.
-
- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- This paper demonstrates that the Kennedy Goodwin macroeconomic model of capital accumulation (KGM) does not reflect direct increasing return. The author presents its two versions: KGM-I with weakening roundabout increasing return and KGM-II with reinforcing roundabout increasing return. Both have the common intensive form and same asymptotically stable stationary state. KGM-II is changed to allow for direct increasing return to scale, whereby the growth rate of employment ratio positively influences the growth rate of labour productivity. If the latter effect is strong enough, the dynamic equilibrium is locally repelling and bifurcates into closed orbits. Their period is estimated. This paper supposes a closed loop control that stabilizes the oscillatory dynamics of the main macroeconomic variables, main-taining profitability and employment under direct and roundabout increasing returns. It is proved that the supposed policy would be destabilizing if the direct scale effect were power-fully negative that is not supported empirically. Simulation runs maintain analytical findings. This paper yields insights for public debate on competent pro-growth stabilization policy. Key words: growth cycle, primary income distribution, employment, stabilization policy.
-
- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- The article presents the results of ongoing research on resilience in production systems. It refers to the term resilience as used in socio-ecological systems and applies it to assess the long-term functionality and effectiveness of industrial organizations in an uncertain world. It concentrates on refineries and chemical plants which, due to complex and sophisticated production processes and products themselves, are especially vulnerable to various kinds of disturbances. To illustrate the idea of resilience the machine reliability improvement programmes are examined using System Dynamics models to investigate situations when internal or external stress can lead to regime shift in production systems and make them move to an undesirable configuration e.g. from proactive to reactive maintenance mode. Resilience proved to be a useful concept for production managers interested in organizational transition to a more desired operational domain as well as remaining in the desired domain. System Dynamics methodology offers powerful tools for examining the impacts of various policy options on the dynamics of resilience in production systems.
-
- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- This paper presents initial results from field work on immunization coverage as part of improving health care policy implementation in Uganda. System Dynamics modeling and case study research methods have been used to capture the complex and dynamic nature of the immunization process, to enhance the understanding of the immunization health care problems and to generate insights that may increase the immunization coverage effectiveness. Field studies have been conducted to establish the operational immunization policy issues of concern to health care management which included capturing reference modes for the key variables and developing causal loop diagrams to illustrate the dynamics among key variables. The paper suggests an initial model that could be used for theory building in immunization policy evaluation.
-
- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- Dynamics of markets are even today not adequately represented in most market studies so that yet nowadays, wrong conclusions are quite common. A good tool for analyzing markets and its dynamic character is the coordination failure diagnostics concept (cfd-concept) which is based on the idea of control loops on the one hand and economic literature of competition on the other hand. Regarding innovations, it takes a closer look at product and technology progress which are core tasks to assure the survival of markets or, to be exact, products. Nevertheless, even in this concept the direct influence of up- and downstream markets was ignored so far, although it seems to be obvious that innovations stimulate new innovations itself they might occur on the same or on related markets. First thoughts of analyzing market complexes with the help of cfd and system dynamics are to be introduced in this article.
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- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- Max Webers argument that organizations benefit when they operate consistently and Robert Mertons counter-point that consistency arises from organizational dysfunction create a fundamental tension in organization theory. Substantial research has examined the spread of bureaucracy and organizational practices, while other research has examined how organizational change affects survival, but there has been surprisingly little research on the value or dysfunctional nature of ongoing consistency in following rules for decision making. This paper develops measures based on the definition of consistency as close adherence over time to a set of simple rules for conducting business. We explore the sources of consistency and test whether greater consistency is a beneficial high point in organizational development or, instead, whether consistency simply reflects Emersons notion of a hobgoblin of little minds.
-
- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- Working with groups unfamiliar with system dynamics, modelers need a quick way to introduce the iconography of the approach and some of its framing assumptions. In the early exploratory days of group model building interventions at the University at Albany, we settled on the use of sequences of tiny models for this purpose, which we call concept models. The intent is to begin with a sequence of simulatable pictures so simple and self-explanatory, in the domain and language of the groups problem, that the group is quickly and naturally drawn into the system dynamics approach. Previous papers have sketched in passing the notion of concept models as we have used them. Here we provide a number of illustrative examples and describe in detail the ways we use these little models, the assumptions behind them, some design principles that have matured over time as our experience has grown, and a discussion of possible problems with the approach.
-
- Type:
- Document
- Date Created:
- 2006 July 23-2006 July 27
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- f9377a3ac7b50b1fca5e04fb6d679ec2, 23d738ba88f8333bc39725f9cb5bd0b8, and 32937c7b43e3e015509bb71fd40d2054
- Description:
- Please see the "Paper" file for the speech given at the conference announcing the award winners.