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The optimal theory has been used to design a digital controller for a nuclear reactor. The total reactor power control is studied in the range of 80 to 100% of rated power, with the steady state and load-following control. The control algorithms are considered suitable for implementation in direct digital control.
The proximity sensor is a kind of nontactile sensors and it can measure the spatial state of the object in the range of 0-100 ㎜ to cover the sensing gap between the tactile sensor and the vision system In this paper, a new optical proximity sensor which can separately measure the location and the orientation of the object surface in the working range is designed. The measuring principle of this sensor is based on the reflection law. Four LEDs for light sources and four lenses for converging the beam are symmetrically mounted at the sensor head. Two photo-transistors are mounted on the both sides of each converging lens to measure the reflex. The sensing system is implemented by using 8086 microprocessor and interface circuits to pule each LED sequentially and measure outputs of the photo-transistors. This sensing system calculates the inclination angles and gap distances by the use of curve fitting algorithms and then estimates the shape of the object surface using these results and the plane fitting algorithm. The experimental results show that this sensor works satisfactorily. This sensor can be applied to the robot manipulator in order to improve the robot performance.
This paper describes the application of fuzzy algorithms to the control of processes with time delay. PI controller with Smith predictor has been developed to improve the response of the process with time delay. But this controller needs exact model and if the mismatch between model and process is large, the performance of the process is decreased. So this paper introduces the FLC(fuzzy logic controller) to remove these problems. The fuzzy control algorithm is used to implement linguistically expressed heuristic control policies directly, with a view to automating those complex and poorly-defined processes where modelling difficulties and lack of suitable measurments make manual control imperative. The FLC based on fuzzy set theory provides a means of converting a linguistic control strategy based on expert knowledge into an automatic control strategy. But conventional FLC is apt to generate the limit cycles in output response for a time-delayed process. The proposed FLC includes predictive model to eliminate those limit cycles at steady-state and to improve the transient response and robustness.
A new DSP-based high prectision servo system developed for home VCRs is discribed. The digital PID with anit-reset windup is applied to the control algorithm. The hardware is implemented by the floating-point digital signal processor(TMS320C30). The characteristics of the new servo system are superior to those of the conventional system. This system can contribute to the servo system of the digital VCRs.
In this paper, the modeling of the tension control part in the digital VCR is carried out. And the new algorithm to reduce the variation of the tension in the tape due to the skip-play is presented. According to the experimental results, tension control part of the VCR shows the better control characteristics when the proposed algorithms are applied.
A vision system for multi-frame data processing is proposed. It is based on PC bus, the de facto standard in most industrial applications. The purpose of this paper is to build an effective vision system for processing multi-frame data at a time. It is often requested in real world application when the targets must be handled by several frames for the purpose of resolution enhancement and/or for the reason of largeness of the objects. The major components of the vision system, image grabber & image data processor, are mainly discussed in this paper. The image grabber converts input analog signal to digital data and transfers the data directly to the image data processor without passing via the PC bus for fast data transmission. The image data processor is in charge of image processing and actually a parallel processing unit of four processing modules which operate independently. Each module contains a 32 bit transputer and its own program & frame memory. The proposed architecture is convenient for performance expansion and has no saturation accoring to it. In addition, to show the usefulness of the proposed vision system, the experimental result are also described.