In this paper, a new guidance law is designed to improve the performance of a homing missiles guidance system in terminal phase. For this purpose first of all, the two dimensions equations of motion are formulated, then the approximation dynamic of missile control loop is added to these equations which are nonlinear whit unmatched uncertainty. Then, a new adaptive back-stepping method is develo...

In this paper a new nonlinear guidance law with finite time convergence is proposed. The second order integrated guidance and control loop is formulated considering a first order control loop dynamics. By transforming the state equations to the normal form, a finite time stabilizer feedback linearization technique is proposed to guarantee the finite time convergence of the system states to zero...

In missile guidance system, to reduce the interception “miss distance,” it is important to choose a suitable guidance law and navigation constant. This paper investigates and compares the system behavior of guidance laws under different navigation constants. Based on use of the adjoint technique, miss distance sensitivity analyses which consider the system noise, target step maneuver, initial h...

During the course of a day, consumers experience choices that involve goal conflict (e.g., eat tasty vs. healthy food, recreate vs. work, relax vs. act). In some cases, an initial behavior is followed by a similar behavior. In other cases, an initial behavior is followed by an opposing behavior. We posit that a passive guidance system can nonconsciously guide behavior when there is goal conflic...

Academic Guidance in Iranian Educational System: Practical Experiences and Lasting Challenges   A. Navidi, Ph.D.*   To identify the shortcomings and challenges facing the academic guidance program in the Iranian educational system, as reflected  in over fifty years of research in this area, more than fifty research reports are examined and the ups and downs of this program ar...

One of the original goals of intelligent educational systems was to guide each student to the most appropriate educational content. In previous studies, we explored both knowledge-based and social guidance approaches and learned that each has a weak side. In the present work, we have explored the idea of combining social guidance with more traditional knowledge-based guidance systems in hopes o...

some fifteen years, and was originally coined in the United States. It is particularly appropriate, as the word " guidance " stresses the preventive side of the work. Actually, child guidance forms one part of the bigger subject of psychological medicine ; just as pediatrics is the children's department of general medicine, so child guidance is the children's department of psychological medicin...

Based on the idea of Continuous Fuzzy Guidance Law (CFGL), a andldquo;three-phase fuzzy guidanceandrdquo; (TFG) law is proposed for the class of surface to air homing missiles. The current approach enables the guidance law to track a maneuvering target from the beginning of the launch phase up to the terminal one while itdynamically attempts to keep miss-distance, flight time and control effort...

the study was designed to determine the rate of depression prevalence among the guidance and secondary school students in shahreza town on 1384-85. 960 boy and girl students were selected through stratified random sampling method that was assessed through beck depression inventory (bdi). the data were analyzed through frequency and chi square test.this analysis indicated that %12/9 of students ...