Cyber attacks pose a major threat to modern organizations. The effectiveness of cyber defense can likely be enhanced if programs are implemented that allow organizations that face similar cyber threats to share information and resources. To begin to understand the potential for cooperation to improve cyber security, we modeled a simple cooperative structure that allows resource sharing between two organizations whose defense teams do a significant amount of redundant work. This model is a first step toward understanding the social and operational issues involved in implementing a program of cooperative cyber defense between organizations.
This paper expands upon a qualitative study done by Beck and Stave (2011) investigating how to understand the dynamics underlying urban quality of life and sustainability. In the original study, we examined the factors and feedbacks that governed migration in and out of urban areas. Quality of life (QOL) was assumed to be the short term motivator behind migration, while sustainability determined the long term livability of a city. Past studies on these topics all have a common thread: sustainability and QOL both pertain to peoples relationship to capital. In this study, we illustrate how these forms of capital interact with a citys population to create in migration and out migration behavior based on the attractiveness of its capital stocks. We monitor the accumulation of different forms of capital to evaluate sustainability and use the distribution of capital as proxy for quality of life. Finally, we provide our experience in validating the model using historic population trends of three American cites.
The purpose of this paper is to propose a dynamic hypothesis for shipyard learning. From this dynamic hypothesis was developed a system dynamics model that served as a basis for the definition of guidelines that could serve as a basis for policy design in a real shipyard that seeks learning in productivity.
High copper prices, the prospect of a transition to a more sustainable energy mix and increasing copper demands from emerging economies have not let to an increased attention to the base metal copper in mineral scarcity discussions. The copper system is well documented, but especially regarding the demand of copper many uncertainties exist. In order to create insight in this systems behaviour in the coming 40 years, an Exploratory System Dynamics Modelling and Analysis study was performed. Three different models have been developed representing different views on copper supply and demand. The behaviour of these models shows crisis-like behaviour for the copper price, and often a declining consumption of refined copper. Six different policy options have been explored, individually and in combinations, for their robustness in counteracting undesirable behaviours. The results of these tests are that emphasising recycling, and the development of strategic reserves are potentially helpful.