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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:
- Fishery policies have largely developed in response to current problems. One of the last policies to be implemented is individual transferable quotas, ITQs. This seems to be a promising policy instrument compared to those which have shown weaknesses. Extrapolating from previous experiences, however, a further investigation of the ITQ system may reveal weakness of this instrument as well, and may help improve the policy or stimulate the development of alternative policies. One such alternative may be auctioned seasonal quotas, ASQs. A laboratory experiment of a market with seven fishing firms is used to compare the two policies. Compared to traditional laboratory experiments, this experiment allows for dynamic adjustments of fishing capacities as well as quotas. Weaknesses and strengths are revealed, some of them surprising. For instance, having to pay variable prices ASQs may lead to less variation in equity than owning ITQs.
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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:
- Ongoing field work centered at the Information Technology Process Institute (ITPI) is finding that change and access controls simultaneously reduce security risk and increase the efficiency and effectiveness of information technology (IT) management and operations. The CERT® Coordination Center is building on this work. This paper describes a system dynamics model that embodies our current hypothesis of why and how these controls reduce the problematic behavior of the low-performing IT operation. We have also started to extend the model in ways that reflect the improved performance seen by high performers. In the longer term, we hope this model will help to understand, specify, and justify a prescriptive process for integrating change and access controls into their business processes in a way that most effectively reduces security risk and increases IT operational effectiveness and efficiency.
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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:
- In this paper, we use the social capital theory to extend the topic about the evolution of industrial districts, aiming to verify whether or not social capital may be considered as a critical source in explaining the dynamics of population of co-localised organisations towards the phenomenon of passive internationalisation. The study explores these issues by analysing the pattern of fragmentation of production and the change of internal rules of actors inside a textile industrial district localised in the Center of Italy Val Vibrata after the internal invasion of foreign business players in different stages of chain value. We use these empirical data to calibrate a computer simulation model so to generate a number of near-histories that capture possible unfolding cluster dynamics.
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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:
- Balancing responsiveness to market requirements with overall efficiency is an important issue in supply chain design and management. The objective of the system dynamics model introduced in this paper is to capture generic structures and the intrinsic dynamic behaviour modes of supply chains considering aspects of responsiveness and efficiency. The research strives for a better understanding of these aspects: what are the structural consequences of implementing strategies striving for efficiency or responsiveness in the real world, and how can they be represented in a System Dynamics model? Furthermore, simulations will be used to assess the dynamic consequences of these different strategic alternatives. Future research will then focus on identifying policies to balance responsiveness and efficiency in a specific industry and by that resolve the trade-off between the two.
-
- 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:
- We present results from a preliminary system dynamics model of problems in recruiting clients to a hypothetical HIV prevention program. Efforts in HIV prevention emphasize moving programs of demonstrated efficacy to community settings. However, little is known about how these programs interact with contextual elements of service delivery to determine the feasibility of implementation. The section of the model we present here focuses on the stocks and flows associated with attracting, enrolling, and graduating a steady flow of clients into small-group workshops and highlights paradoxes in providing this type of program in the community. We test two policies that either focus on monitoring the recruitment rate or monitoring the graduation rate. Despite its superiority in real-life experiments for producing behavioral change, our model suggests that small-group workshops are a highly inefficient means to change the behavior of a target population over a ten-year period of time.
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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:
- The paper discusses the representation of expectation formation processes in system dynamics. After a brief overview of current behavioural research on expectation formation, it analyses the implicit assumptions that arise from a representation with exponential smoothing and the TREND function. It addresses the limitations of univariate autoregressive algorithms and illustrates their difficulties in representing the causal reasoning processes that may underlie expectation formation. It is argued that exponential smoothing and TREND actually neglect the importance of causal and systemic reasoning and thus are not in line with the paradigm of systems thinking. Finally, three alternative approaches to modelling expectation formation are outlined.
-
- 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:
- World - Grid Type, Continuously Under-development - System Dynamics The main goal of United Nation is realization of sustainable development world society vision. Such society need to integrate social development with economic development and environmental protection. For this end it is necessary to enable sustained economic growth, internalizing externalities and decoupling the range of economic growth from the range of deficit natural resources depletion growth and degradation of environment. In order to achieve above UN Goal we have to build WORLDWIDE, COMMONLY ACCESSIBLE, SUSTAINABLE DEVELOPMENT-INFORMATION SYSTEM for: - comprehensive monitoring, - far-sighted forecasting, and - measurable evaluation, of policy, economy, work, and other changes effects in life-conditions of human-beings and nature in general. This system ought to be built on the base of System Dynamics. We propose research program, which allows to describe conditions of creation such big, grid type, multi stage built, information system.
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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 explores the foundation of the financial accounting model. We examine the properties of the accounting equation as the principal algorithm for the design and the development of a System Dynamics model. Key to the perspective is the foundational requirement that resolves the temporal conflict that resides in a stock and flow model. Through formal analysis the accounting equation is redefined as a cybernetic model by expressing the temporal and dynamic properties of its terms. Articulated in that form the accounting equation is enabled to be defined as a dynamic stock and flow model expressing the two dimensions of the double-entry accounting system. With that formal foundation it is argued that the accounting model is capable to simulate financial dynamics as well as be integrated with models that express operational and world dynamics. Thus we prove that it is possible to design and build a dynamic business model that can meet requirements of management accounting (ex ante, before the fact) as well as financial accounting (ex post, after the fact). We conclude that the dynamic accounting model can be made relevant for strategic planning and control purposes and be integrated within a System Dynamics model designed for such purposes.
-
- 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 formulates and analyzes a strategic model for Pakistan Railways. The objective of the model is to understand the potential consequences of investment strategies aimed at establishing operational and financial sustainability of the Pakistan Railways. The model replicates a wide range of inter-connected causal relationships between different factors to reflect the decision making process in the sectors including Rolling stock (passenger coaches and locomotives), Maintenance of Rolling stock, Tracks, Maintenance of Tracks, and Finance. The model incorporates how these sectors interact to each other over time. The model can be used for evaluating potential outcomes of individual and combinations of individual investment strategies implemented at different times. The conclusion derived from the model experimentations indicates that a better operational policy for the Pakistan Railways to improve its operational performance and financial sustainability would constitute expanding the track capacity with increased provision for maintenance capacity.
-
- 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:
- Upgrading Defence capability involves much more than acquiring new hardware such as weapons or aircraft. This paper demonstrates how system dynamics modelling was used to assist in planning and management of the introduction into service of a new generation multi-role helicopter type. It describes the challenges of managing resources; and the complex interrelationships between tasks such as the training of pilots and aircrew, conducting maintenance on the aircraft and the achievement of defined levels of capability to conduct military operations. Whilst the modelling task focused initially on the management of human resources, it soon became obvious that complex dynamic problems are best addressed using a top-down approach, to achieve optimisation at the system level rather than attempting to optimise sub-systems. The modelling approach exploited trusted, functional modules of system dynamics structure rather than ab initio model construction. How this aided model construction and verification is described.