An improved particle swarm algorithm based on the D-Tent chaotic model is put forward aiming at the standard particle swarm algorithm. The convergence rate of the late of proposed algorithm is improved by revising the...An improved particle swarm algorithm based on the D-Tent chaotic model is put forward aiming at the standard particle swarm algorithm. The convergence rate of the late of proposed algorithm is improved by revising the inertia weight of global optimal particles and the introduction of D-Tent chaotic sequence. Through the test of typical function and the autotuning test of proportionalintegral-derivative （PID） parameter, finally a simulation is made to the servo control system of a permanent magnet synchronous motor （PMSM） under double-loop control of rotating speed and current by utilizing the chaotic particle swarm algorithm. Studies show that the proposed algorithm can reduce the iterative times and improve the convergence rate under the condition that the global optimal solution can be got.展开更多
Common perceptions of recent tensions between Iran and the GCC states are couched in terms of a longstanding and historically rooted Shia-Sunni conflict between two major regional powers:Iran and Saudi Arabia.This pap...Common perceptions of recent tensions between Iran and the GCC states are couched in terms of a longstanding and historically rooted Shia-Sunni conflict between two major regional powers:Iran and Saudi Arabia.This paper argues that this perspective is simplistic since it ignores the major political drivers of the conflict at regional and international levels.From the perspective of the Regional Security Complex(RSC),the Persian Gulf region has been a typical security sub-complex since the 1970s.After the Iran-Iraq war,Iran adopted a detente policy towards the GCC states taking advantage of a domestic consensus to improve relations with her neighbouring states.The drive gained momentum after the arrival in office of President Hassan Rouhani in 2013.However,his GCC policy has faced multiple challenges.The GCC countries have increasingly been suspicious and critical of Iran’s growing strength and regional influence.The intensification of the proxy games with Saudi Arabia have increased the insecurity of GCC states.Internationally too,the USA’s tough stance under President Trump and the return of the economic sanctions regime against Iran has raised regional temperatures,making it even harder for Iran and the GCC to improve their relations.We argue that to understand the proxy wars between Iran and Saudi Arabia in particular,a more nuanced approach is needed that goes beyond religious strife and rivalry.展开更多
基金supported by the National Natural Science Foundation of China(61301011)the Fundamental Research Funds for the Central Universities(HIT.NSRIF.2012010)+1 种基金the China Postdoctoral Science Foundation(2013M540279)the Heilongjiang Postdoctoral Financial Assistance(LBH-Z11157)
文摘An improved particle swarm algorithm based on the D-Tent chaotic model is put forward aiming at the standard particle swarm algorithm. The convergence rate of the late of proposed algorithm is improved by revising the inertia weight of global optimal particles and the introduction of D-Tent chaotic sequence. Through the test of typical function and the autotuning test of proportionalintegral-derivative （PID） parameter, finally a simulation is made to the servo control system of a permanent magnet synchronous motor （PMSM） under double-loop control of rotating speed and current by utilizing the chaotic particle swarm algorithm. Studies show that the proposed algorithm can reduce the iterative times and improve the convergence rate under the condition that the global optimal solution can be got.
文摘Common perceptions of recent tensions between Iran and the GCC states are couched in terms of a longstanding and historically rooted Shia-Sunni conflict between two major regional powers:Iran and Saudi Arabia.This paper argues that this perspective is simplistic since it ignores the major political drivers of the conflict at regional and international levels.From the perspective of the Regional Security Complex(RSC),the Persian Gulf region has been a typical security sub-complex since the 1970s.After the Iran-Iraq war,Iran adopted a detente policy towards the GCC states taking advantage of a domestic consensus to improve relations with her neighbouring states.The drive gained momentum after the arrival in office of President Hassan Rouhani in 2013.However,his GCC policy has faced multiple challenges.The GCC countries have increasingly been suspicious and critical of Iran’s growing strength and regional influence.The intensification of the proxy games with Saudi Arabia have increased the insecurity of GCC states.Internationally too,the USA’s tough stance under President Trump and the return of the economic sanctions regime against Iran has raised regional temperatures,making it even harder for Iran and the GCC to improve their relations.We argue that to understand the proxy wars between Iran and Saudi Arabia in particular,a more nuanced approach is needed that goes beyond religious strife and rivalry.
