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In this paper, a simple framework for PID controller design is presented which leads to the important popular setting, Ti=4T d. This setting first appeared in the Ziegler and Nichols tuning and has been widely adopted so far. The framework also provides analytical PID tuning formulas with improved performance over the ZN tuning
A discrete event risk model based on asymmetric stock return models was investigated in this paper. In this model, discrete event risk was described by random jump-diffusion process and the asymmetric effect was described by GJR-GARCH (generalized autoregression conditional heteroscedasticity) model. The model's parameters were estimated by simulated annealing algorithm. By simulation method, the...
A generalized predictive control strategy aimed at a kind of bilinear Hammerstein model is proposed in the paper. The strategy avoids solving the high level equation by improving the static nonlinearity portion in the bilinear Hammerstein model and adopts the generalized predictive control algorithm in the bilinear portion to avoid the heavy computation of generic nonlinear optimization, thus the...
This paper reports our 3D reconstruction work of mouse brain cells from a confocal image stack. Gradients at volumetric points are used for boundary surface extraction and structure visualization from 3D volumetric confocal microscopic images. We present a method to automatically evaluate the suitability of gradients for 3D boundary identification. The approach developed is applied for 3D reconstruction...
In this paper, we consider the stabilization of switched system with controllable subsystems under arbitrary switching law and the stabilization of its perturbed system when the perturbation satisfies certain condition
An iterative image resolution enhancement algorithm is presented based on a Bayesian MAP estimator. In order to speed up convergence and improve stability, additive regularization terms based on a set of exponentially varying weights and a least square criterion are added to the cost functional. Experimental results show that sufficient numbers of low-resolution frames and iterations are needed to...
A simple PID tuning method for dominant pole placement and phase margin specification is proposed in this paper. Time domain specifications as settling time and percentage overshoot are represented by a pair of dominant poles, which is combined with phase margin specification to achieve closed-loop stability and robustness. A graphical method is developed to determine PID settings to meet these specifications...
A reliable routing algorithm is proposed based on multi-path. The algorithm constructs multi-path to provide reliability based on B-spline curve. Simulation results show that the algorithm has low overhead and can provide the reliability to some extent
Text superimposed on the video frames provides supplemental but important information for video indexing and retrieval. The detection and recognition of text from video is thus an important issue in automated content-based indexing of visual information in video archives. Text of interest is not limited to static text. They could be scrolling in a linear motion where only part of the text information...
A global nonsingular terminal sliding mode controller is proposed for a class of second order time delay systems with distributed in state and control variables. By properly designing a state transformation and a predictor, the given system can be transformed into a time delay free one, based on which we construct a new terminal sliding mode surface. Under the proposed terminal sliding mode controller,...
A neural network controller for direct yaw moment control was developed to improve the vehicle stability. The neural network approximate model was used to identify the vehicle system and then the controller was obtained by rearrangement of the neural network plant model. The controller was designed to generate additional yaw moment and make the yaw rate tracking the desired trajectory. The numerical...
Recently repetitive controller has been applied in servo systems of hard disk drives (HDD) to remove the repeatable errors caused by rotating mechanism of spindle motors. However, most results of published articles are too complex to be implemented in industrial applications. In this paper, we present an improved design strategy for repetitive control of HDD by minimizing the power spectral density...
The advantage of low cost and large capacity gives strong driving force for hard disk to enter the consumer electronic market. One of the most challenging servo control issue faced in mobile application is to perform normal read/write operation when significant vibration is excited in HDD jogging/walking condition. This paper presents a simple yet effective method to improvement hard disk throughput...
We propose in this paper an efficient early termination algorithm of intra prediction for H.264/AVC. It uses the spatial correlation after 16times16 inter prediction to make the judgement on whether to discard intra prediction or not. Experimental results demonstrate that the proposed algorithm can save the encoding time of H.264/AVC (JM98) between 25-45% with negligible degradation in the quality
The formal description of distributed supervisory and controlling systems can promote development efficiency and decline cost during the procedure of system design and implementation. The goal of our research is to develop a formal modeling methodology for supervisory and controlling systems that have artificially intelligent features. This approach is agent-based and central to the development of...
The magnetic dipole-dipole configuration adopted in sea-floor detection is effectual. A mass of experiments in lab and field are performed in order to analyze the profile characteristic. When the exploration depth and dipolar distance are changed, the form and polarity of the profile are different. The detection result is distinct when the dipolar distance is small. But its peak value is negative...
In this paper, we present a novel approach to counting number of people that pass the view of an overhead mounted camera. Moving people are first detected as blobs and represented by binary masks, based on which possible multi-person blobs are further segmented into isolated persons according to their areas and locations. Each single person is tracked through consecutive frames using a correlation-based...
This paper presents a controller based on an adaptive network fuzzy inference system (ANFIS) for vision-based lateral vehicle control system. The lateral error and relative yaw angle between vehicle longitudinal road tangent directions at certain look-ahead distance are assumed to be measured by vision system and applied to the controller. The fuzzy controller is implemented with ANFIS architecture,...
A novel voltage sensor-less control technique, linear ramp follower (LRF), is proposed in this paper for a boost AC/DC pre-regulator. The power factor correction (PFC) pre-regulator controlled by the proposed technique, will require only an inductor current sensor and operate at a constant switching frequency with a simple control circuit. The AC input and DC output voltages are extracted individually...
The paper describes a particular type of self-designed test system for the measurement of thermal protective performance (TPP) of fire protective clothing. A 2nd degree burn curve in human tissue is used as a criterion to rate the performance of clothing materials. It is known that the quality of fire protective clothing, esp. the thermal protective performance is of great significance to the lives...
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