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- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- Recently there has been a dramatic increase in worldwide attention to environmental issues based on climate change and global warming. This effort has resulted in advances toward a new paradigm, 'sustainable development'. Especially, Green Growth has risen as a new alternative to earlier problems. Korea has focused on the Green Growth, and several plans have been presented by the current administrations. The main purpose of this study is to find what steps are included in the agenda setting process of the Green Growth in Korea, using both time series analysis and system thinking approach. To conduct a time series analysis, the paper examines articles of newspaper and government reports. And, to build a causal map, the speech of current president of Korea is analyzed. The study concludes that the political consideration has played a major role in the policy agenda-setting process of Green Growth in Korea. In addition, it is identified that causal map analysis, as a qualitative approach, can complement the existing method for analyzing the policy agenda setting process.
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- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- This research explores the effects of implementing a lean production system in a government facility that is formally governed by accounting practices which delay recognition of production savings but which informally promotes its lean efforts through attention-getting, off-the-books, innovative accounting. We state three propositions relating to customers effects of the lean improvements and the financial approaches. We then state four hypotheses relating to unintended effects of these measures as a facilitys workload varies, and test the hypotheses employing a system dynamics simulation. We identify minor effects upon customer behavior and labor rates oscillation, thereby filling gaps in the literature relating to government productivity improvements, and expanding knowledge relating to lean labor savings, work demand, and employment effects.
-
- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- As Highly Pathogenic Avian Influenza (HPAI) had become an issue in Korea, Korean Government has decided to make a complete defense system of HPAI using system dynamics and agent based modeling techniques after a preliminary research. This paper summarizes the simulation part of the Korean Government efforts on HPAI.
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- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- In recent years, there has been an increase in the interest for fishery dynamics in the System Dynamics field but most of the work has been related to the management of wild fish stocks. In this paper, we present an exploratory study of the effect of fish farming on the stock of wild fish stocks based on the case of Chilean Salmon industry. Fish farming does not reduce the impact of fishing activities but it increases their effects since it is necessary almost 6 kilograms of wild fish for each kilogram of salmon produced.
-
- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- Research on learning via system-dynamics-based learning environments depends on good measurement of learning. Most such research considers at least two aspects of learning, the participants understanding of the models and problems, and the partici-pants' performance in the environment, e.g., quality of decision making. The former, understanding, is much more difficult to measure than the latter, performance. Meas-urement of understanding is often done by eliciting verbal protocols from participants about the problem situation (i.e., the underlying model) and their planned solution strat-egy (i.e., decisions). Coding and analysis of participants verbal protocols is very sub-jective and time-consuming. To facilitate measurement and analysis of understanding via verbal protocols, we investigate the utility of a software application which performs such analysis automatically. We assess this automated analysis methodology using data from two different system-dynamics-based learning environments, including how par-ticipants understanding compares to experts, how it changes over time, and how it cor-relates with performance.
-
- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- East Asians and Westerners have kept very different systems of thought for thousands of years. Generally speaking, in contrast to the mechanistic and analytic Western view, the Eastern view of the world is said to be organic. Various philosophies and religions have influenced formation of Eastern thought for thousands of years. Notably, this paper focuses on thoughts of Buddhism, Taoism, Confucianism, Yin-Yang theory and thought of Three Essences (time, space, ens). Eastern thought, in general, says that the world is, like a web, an interrelated complex system of the three essences. Therefore, according to Eastern thought, there is no space without time and ens, no time without space and ens, no ens without time and space. They are interpenetrating. The organic and ecological world view of the East Asians is very close to the systems thinking of the System Dynamics. Since, like this, systems thinking essentially has inhabited Eastern thought, Eastern Asians are relatively familiar with systems thinking in their daily life. Hence, this paper aims to seek the profound relation and harmony between ancient Eastern wisdom and modern systems thinking. Such a study could extend basis of System Dynamics across areas of Eastern philosophies.
-
- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- Most models that assess the relative number of transmissions during different stages of human immunodeficiency virus (HIV) infection assume that the transmission occurs through instantaneous sexual contacts. In the real world, however, human sexual interactions occur in the context of a complex social system, and HIV is likely to transmit through repeated sexual acts during partnerships formed and broken over time that last for varying lengths of time. We sought to understand how dynamic sexual partnerships would influence transmission dynamics during different stages of HIV infection: primary HIV infection (PHI) and asymptomatic HIV infection (AHI). Using a pair approximation technique, we developed a dynamic model of HIV transmission in a homogeneous population that includes the formation and dissolution of sexual partnerships of varying duration. The fraction of transmissions during PHI is a U-shaped function of increasing partnership duration, such that the fraction decreases as partnership duration increases up to a few years, but rises again as partnerships are further lengthened. Our results show that the dynamics of sexual partnerships strongly influence HIV transmissions by stage and models that assume instantaneous contacts will likely overestimate transmissions during PHI for real, dynamic sexual partnerships with varying (non-zero) durations.
-
- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- In this paper, I discuss how to teach system dynamics and systems thinking from the perspective of the eastern philosophy, especially in Korea and China. Based on my experience of teaching system dynamics to Korean people for 15 years, I present some kind of fundamental similarities and linking pins between eastern philosophy and system dynamics. Presentation of their similarity usually provided Korean students a kind of familiar feeling with the system dynamics and facilitated their understanding of its key concepts. Also I explain my experience on presenting research outcomes of system dynamics to Koreans with the help of linking pins between system dynamics and eastern philosophy.
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- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- Maintaining military aircraft in a high state of readiness requires a non-stop flow of spare parts. These replacement parts can either be new parts from procurement or repaired parts coming from overhaul. The cost of these replacement parts is a major component of total lifecycle operating and sustainment costs. Improvements in reliability can potentially reduce removals and these on-going costs. The overall cost reduction depends upon the interaction over time of any increase in the cost of the new improved part, the increase in reliability, changing demand levels and the role of overhaul. Three overhaul scenarios are examined for cases of improved reliability: (i) old parts improved in overhaul; (ii) old parts not improved in overhaul; and (iii) no overhaul. A system dynamics supply chain model including financial performance metrics is developed to investigate these scenarios through simulation. It is shown that all three scenarios reduce total lifecycle costs and that these reductions can be very significant. The first overhaul scenario is shown to have the greatest returns but the third scenario is only slightly lower. All scenarios are shown to have diminishing investment returns and share a common level of investment that maximizes the percentage reduction in lifecycle costs.
-
- Type:
- Document
- Date Created:
- 2010 July 25-2010 July 29
- Collection:
- System Dynamic Society Records
- Collecting Area:
- University Archives
- Collection ID:
- ua435
- Parent Record(s):
- 516b485dacfb3c26da448243f0948912, 23d738ba88f8333bc39725f9cb5bd0b8, and 17bfad39e1d09bfe17f82d7ae001449f
- Description:
- Doing more with less has become a long-running and recurring theme across the globe. Affordability is now a key metric for operations and sustainability, and reliability is now seen as a key driver of these lifecycle costs. A system dynamics model has been developed of an aviation supply chain that enables evaluation of alternative cases in which investments are made to improve reliability, lower total demands, and reduce spending on new procurement and overhaul over the lifecycle. It is shown that the payback potential of an investment depends upon annual demand for the part, cost of the part, percent improvement in reliability achieved, and any increase in cost of the part due to the re-design. The analysis show that returns can be high and payback periods can be fast, particularly for investments to improve reliability of items with high demand and high cost. The research also indicates that close coordination is needed between program management, procurement planning and acquisition in order to fully realize savings. Ongoing research is developing reliability investment strategies and estimates for lifecycle costs under differing demand, manufacturing and overhaul scenarios.