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The purpose of this paper is to develop new four-dimensional (4D) hyperchaotic system by adding another state variable and linear controller to three-dimensional T chaotic dynamical systems. Its dynamical analyses, circuit experiment, control and synchronization applications are presented.

A new 4D hyperchaotic attractor is achieved through a simulation, circuit experiment and mathematical analysis by obtaining the Lyapunov exponent spectrum, equilibrium, bifurcation, Poincaré maps and power spectrum. Moreover, hardware experimental measurements are performed and obtained results well validate the numerical simulations. Also, the passive control method is presented to make the new 4D hyperchaotic system stable at the zero equilibrium and synchronize the two identical new 4D hyperchaotic system with different initial conditions.

The passive controllers can stabilize the new 4D chaotic system around equilibrium point and provide the synchronization of new 4D chaotic systems with different initial conditions. The findings from Matlab simulations, circuit design simulations in computer and physical circuit experiment are consistent with each other in terms of comparison.

The 4D hyperchaotic system is presented, and dynamical analysis and numerical simulation of the new hyperchaotic system were firstly carried out. The circuit of new 4D hyperchaotic system is realized, and control and synchronization applications are performed.

Classical assumptions of agency theory (AT) fall short of providing satisfactory answers to modern management and organizational knowledge (MOK) problems, and there is a need for extending the scope of the field. This article aims to compare modern AT assumptions with the agency perspective of Islamic historical political treatises (namely, siyasetnamas) and point out how AT can be furthered.

This article applies content analysis method to find out agency perspectives in Islamic political treatises and then compare them with those of the basic AT assumptions to find out similarities and differences between them in explaining agency problems.

The agency perspective in siyasetnamas are based on the following assumptions which could contribute to the development of AT with their emphasis on (1) responsibilities beyond contracts, (2) entrustment rather than ownership, (3) shared societal responsibility rather than conflicting individual interests, (4) importance of self-control for both principals and agents and (5) trust discourse which emphasizes inner virtues rather than control discourse.

Agency perspectives cannot be considered independent of cultural imprints. By introducing siyasetnamas' agency perspective, this article makes an effort to suggest implications for how to further modern MOK based overwhelmingly on individualistic cultural assumptions to rediscuss agency problems from the viewpoint of specifically the emerging markets in which collectivist culture plays an important role in social and economic life. In this respect, siyasetnamas' agency perspective based on the notion of entrustment seems, arguably, to be a better fit to the contextual realities and managerial practices of emerging markets.