- 著者
- Akio MATSUMOTO Yasuo NONAKA
- 出版者
- JAPAN SECTION OF THE REGIONAL SCIENCE ASSOCIATION INTERNATIONAL
- 雑誌
- 地域学研究 (ISSN:02876256)
- 巻号頁・発行日
- vol.35, no.1, pp.1-16, 2005 (Released:2007-06-01)
- 参考文献数
- 14
- 被引用文献数
- 2 1
This study investigates an economic implication of chaotic fluctuations that are observed in a nonlinear economic dynamic model. To this end, it constructs a nonlinear discrete time Cournot duopoly model in which firms have U-shaped or inverted U-shaped reaction functions due to production externality and shows that chaotic output fluctuations can arise for strong nonlinearities. Two main results of this study are: (i) it is theoretically as well as numerically confirmed that one of the duopolists can benefit in the sense that the long-run average profit taken along a chaotic trajectory is higher than the profit taken at an equilibrium point while the other is disadvantaged if both duopolists are homogeneous; (ii) it is verified with numerical simulations that both duopolists can benefit from chaotic trajectories if they are heterogenous.
- 著者
- Takeshi Wada Mihoko Hagiwara-Nagasawa Ryuichi Kambayashi Ai Goto Koki Chiba Yoshio Nunoi Hiroko Izumi-Nakaseko Tadashi Koga Akio Matsumoto Yuji Nakazato Keith G. Lurie Atsushi Sugiyama
- 出版者
- The Japanese Circulation Society
- 雑誌
- Circulation Journal (ISSN:13469843)
- 巻号頁・発行日
- vol.85, no.10, pp.1885-1891, 2021-09-24 (Released:2021-09-24)
- 参考文献数
- 29
- 被引用文献数
- 1
Background:Effects of rapid electrical defibrillation and β-blockade on coronary ischemia/reperfusion-induced ventricular fibrillation (VF) during cardiopulmonary resuscitation (CPR) remain unknown.Methods and Results:After induction of VF by 30 min of ischemia followed by reperfusion, animals were treated with defibrillation alone (Group A, n=13), 2 min of open-chest cardiac massage followed by defibrillation (Group B, n=11), or the same therapy to Group B with propranolol (1 mg/kg, i.v.) treatment before ischemia/reperfusion (Group C, n=11). If return of spontaneous circulation (ROSC) was not attained, each therapy was repeated ≤3 times (Set-1). When ROSC was not obtained within Set-1, cardiac massage was applied to all animals followed by defibrillation, which was repeated ≤3 times (Set-2). ROSC after Set-1 was 8% in Group A, 82% in Group B and 82% in Group C, whereas that after Set-2 was 62% in Group A, 100% in Group B and 82% in Group C. Each animal with ROSC in Groups A (n=8) and B (n=11) showed sinus rhythm, whereas those in Group C (n=9) had sinus rhythm (n=5), atrial fibrillation (n=1), accelerated idioventricular rhythm (n=2) and atrioventricular block (n=1). Post ROSC heart rate and mean arterial pressure were significantly lower in Group C.Conclusions:Cardiac massage increased the likelihood of ROSC vs. rapid defibrillation, but β-blocker pretreatment may worsen hemodynamics and electrical stability after ROSC.