06.3_future_work.lyx

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\begin_layout Subsection
Future Work
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We could consider the categories of preys will vary with districts under
 different climates.
 For example, the dragon can predate polar bears and walrus in the Arctic
 while penguins in the Antarctic, but these animals do not exist in the
 tropical area.
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We could consider the different predating difficulties provided by the environme
nt.
 For example, the landform is grass in temperate zone causing an easier
 predating, while that is forest causing a hurdle for predating because
 of the predator's hiding.
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We could extend our model to the condition of predating on the sea.
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Our Conclusion
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What is the ecological impact and requirements of the dragons? 
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What are the energy expenditures of the dragons, and what are their caloric
 intake requirements? 
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How much area is required to support the three dragons? 
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How large a community is necessary to support a dragon for varying levels
 of assistance that can be provided to the dragons? 
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Be clear about what factors you are considering when addressing these questions.
 
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Through our model, we derive that the dragon's growth curve is S-shaped.
 It takes 280 years for a dragon to reach the upper limit of weight, which
 is 281.6 tons.
 The dragon is in the initial growth stage before the age of 19.
 After the age of 131, the dragon enters the steady growth stage.
 The age from 19 to 131 is exponential growth stage, while the dragon grew
 fastest at the age of 52.
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By analyzing the energy composition required by a dragon, our model figured
 out that a dragon's energy expenditure consists of five categories, which
 are: energy for basic metabolism, energy for growth, energy for flight,
 energy for breathing fire and energy for recovery of trauma.
 The curve of the energy a dragon's need vary with time is also S-shaped.
 A mature dragon requires about 140000 million calories each two days, which
 includes a community of 178 sheep and 470 cattle.
 The energy for breathing fire takes a high percentage of the total energy
 expenditure when the dragon is young.
 The energy for basic metabolism takes the most percentage of the total
 energy expenditure during the whole life of the dragon.
 And it needs at least about 14000 km
\begin_inset Formula $^{2}$
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 area to support three mature dragons to live.
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As for the influence of climate conditions, we consider the factors of the
 temperature and the humidity.
 Our results show that the higher the temperature, the less energy the dragon
 consumes.
 The higher the humidity, the lower the energy the dragon needs.
 And the influence of temperature on the dragon is greater than that of
 humidity.
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To determine what is the ecological impact of a dragon, we simulated an
 ecosystem with three different types of preys.
 The results reveal the dragon has a great impact on the prey with high
 energy and dense distribution, while has little impact on prey with low
 energy and sparse distribution.
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Besides, if we suppose the dragons breed through sexual multiplication,
 it will not be stable for three dragons to make up of a population.
 By referring to the literature, we discover that the number of the individual
 that consists of a stable population will be more than 500 
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.
 According to our model, it will take approximately 
\begin_inset Formula $2.33\times10^{6}$
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 km
\begin_inset Formula $^{2}$
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 area for these dragons to live, almost 
\begin_inset Formula $30$
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% of Australia.
 In summary, the dragon can be alive on the earth.
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