According to the soft-switching pulsed SAW (Submerged arc weld) weld power supply based on the double closed-loop constant current control mode, a small signal mathematic model of main circuit of soft-switching SAW inverter was established by applying the method of three-terminal switching device modeling method, and the mathematic model of double closed-loop phase-shift control system circuit ...

This paper proposes an improved continuous-time model predictive control (CTMPC) of permanent magnetic synchronous motors (PMSMs) for a wide-speed range, including the constant torque region and the flux-weakening (FW) region. In the constant torque region, the mathematic models of PMSMs in dq-axes are decoupled without the limitation of DC-link voltage. However, in the FW region, the mathemati...

Automated lines have been widely used in the industries especially for mass production and to customize product. Productivity of automated line is a crucial indicator to show the output and performance of the production. Failure or breakdown of station or mechanisms is commonly occurs in the automated line in real condition due to the technological and technical problem which is highly affect t...

OBJECTIVE To determine whether general cognitive ability, basic mathematic processing, and mathematic attainment are universally affected by gestation at birth, as well as whether mathematic attainment is more strongly associated with cohort-specific factors such as schooling than basic cognitive and mathematical abilities. STUDY DESIGN The Bavarian Longitudinal Study (BLS, 1289 children, 27-...

To predict and improve human performance in spatial segmentation Chinese handwriting recognizer, a mathematic performance model was developed based on Fitts’ law and probability theory of discrete random variables. The model was verified by a behavioral experiment and it can predict subjects’ task completion time well after the subjects experienced 2 stages of practice (R square > 0.9). The mat...

Abstract Slot synchronization is essential to Ad Hoc networks based on Time Division Multiplex Access (TDMA). Since there is no central node in the network, it is necessary to use a decentralized algorithm for synchronizing the local time slot reference. In this paper, the convergence performance of the decentralized slot synchronization algorithm for wireless Ad Hoc networks is analyzed for th...

Modeling and Simulation methodology permits analytic and mathematic performance estimation. Recent switched router systems have been more complicated and functional, and so performance estimation is more difficult. This paper shows application capability about a Modeling and Simulation methodology to that problem. Key-Words: QoS, DiffServ, OPNET, Modeling, Simulation, FSM, CLS-40.

Objectives: One of the issues that have consistently been the concern for the health affair specialists and cure and massive social governors in health fields is the rate of disorders prevalence, diseases and the related subjects to epidemiology. Purpose of this study was to estimate the prevalence of mathematic disability amongst primary schools of Karaj. Methods: Totally 432 students were ...