Recognition Technology for Four Arithmetic Operations

Numeral recognition is an important research direction in field of pattern recognition, and it has broad application prospects. Aiming at four arithmetic operations of general printed formats, this article adopts a multiple hybrid recognition method and is applied to automatically calculating. This method mainly uses BP neural network and template matching method to distinguish the numerals and operators, in order to increase the operation speed and recognition accuracy. Sample images of four arithmetic operations are extracted from printed books, and they are used for testing the performance of proposed recognition method. The experiments show that the method provides correct recognition rate of 96% and correct calculation rate of 89%

A New Fuzzy Iterative Learning Control Algorithm for Single Joint Manipulator

This paper present a new fuzzy iterative learning control design to solve the trajectory tracking problem and performing repetitive tasks for rigid robot manipulators. Several times’ iterations are needed to make the system tracking error converge, especially in the first iteration without experience. In order to solve that problem, fuzzy control and iterative learning control are combined, where fuzzy control is used to tracking trajectory at the first learning period, and the output of fuzzy control is recorded as the initial control inputs of ILC. The new algorithm also adopts gain self-tuning by fuzzy control, in order to improve the convergence rate. Simulations illustrate the effectiveness and convergence of the new algorithm and advantages compared to traditional method

Remote Monitoring System Based on GPRS - A Case Study for Water Withdrawal

In order to realize supervision of water withdrawal, it is necessary to establish a modern monitoring system. This study focuses on the design of a remote monitoring terminal system that is operating in a south province in China. This terminal system adopts GPRS mode to establish communication with monitoring center. Detailed hardware design is provided, as well as its software functions. This terminal device finishes the basic function of water quantity collection. At the meantime, remote upgrade function and picture collection function are proposed in order to perfect the overall function of the system. Kinds of tests were conducted to verify its performances and functionalities. We conclude that the proposed remote monitoring terminal might become a useful tool for supervision of water withdrawal in the dispersed areas

Switching Surface Design for Nonlinear Systems: the Ship Dynamic Positioning

In this paper a design of the switching-surface for the nonlinear system is studied. The aim was to prove that with the linear matrix inequality the coefficients of the sliding surface can be determined optimally for the control law structure. The advantages of the use of the linear matrix inequality reside in the accurate determination of the coefficients of the sliding surface. The sliding mode control for dynamic positioning of the ship with our proposed switching-surface is done. The objective of this control was to make sure that the ship follows a predetermined track. The good trackings are observed from the simulation results which confirm the robustness of the control law obtained by our proposed switching-surface. DOI : http://dx.doi.org/10.11591/telkomnika.v12i4.473