No abstract

No abstract

Evaluation of control signal function is one of the critical subjects in the optimal control problems. The optimal control is usually obtained by optimizing a performance index that is a weighted combination of control effort and state trajectories in the quadratic form, typically known as quadratic performance index (QPI). For the simple case of linear time-invariant (LTI) systems, problems are commonly solved using the well-established governing Riccati equation; however, obtaining the analytical solutions for linear time-variant (LTV) and nonlinear systems has always been highly debated in the optimal control problems. In this study, a newly developed type of Genetic Programming called the archived-based genetic programming (AGP) is presented. Using this algorithm, the analytical solutions for any type of optimal control problems can be obtained faster and more efficiently than the ordinary GPs. Subsequently, due to the inefficiency of QPI in capturing the general behavior of signals, a new performance index named the absolute performance index (API) is proposed in this study. Since the developed AGP algorithm could find the analytical solutions irrespective of the conventional mathematical calculations, it can be effectively implemented to solve the introduced API measures. According to the analytical results, it is observed that in a given problem, the solutions of API are more compatible with the design goals compared with QPI. Furthermore, it is shown that some new forms of the control signals such as impulse solutions, which may not be obtained using QPI, can only be estimated using API in defining the optimal control problems.

Introduction: Professional ethics as a branch of ethic knowledge, evaluates the moral duties in any occupation and attempts to provide guidelines that specify the duties for individuals and professional groups. Also; the second indicator of health support in universities is the professional ethics. The aim of this study was to investigate the relationship between ethics and administrative integrity of workers office. Materials and Methods: The current study was applied-descriptive. The samples were the staff of two University of Medical Sciences. The data collected by Full census method via a questionnaire which was designed by author (0.86 reliability was determined by Cronbach's alpha test). Finally; structural equation modeling was used to analyzing the data. Results:The results showed that professional ethics have relationship with some administrative health components (responsibility, honesty and loyalty to the covenant, respect for social values, Justice and fairness). But has no relation by some other components (for excellence and competitiveness, respect and reverence for others, etc). Conclusions: Professional ethic is a rational thought process that aims to ascertain the fact that which values must preserve and promote by organization. If staff moral be guided can prepare important opportunities to achieve administrative health.