| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Various dynamics expressed by differential and difference equations are clarified from the viewpoints of stability theory, oscillatory theory, and ecosystem model analysis. Specific studies include the global asymptotic stability and equi-asymptotic stability of the interior equilibrium point of a three-species ecosystem consisting of phytoplankton, zooplankton, and small fish; the existence of periodic solutions for a discrete hematopoietic model representing the increase and decrease of mature blood cells; the number of periodic solutions of a discrete model describing the adult fly population; the non-oscillation of solutions of Mathieu equations describing parametric excitation phenomena.
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