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The paper is aimed to design and construct a robot vehicle prototype which is suitable for water surface rescue operations such as helping the drowning people or cleaning the ocean. A characteristic of the design is the vehicle's variable body structure controlled with switching control laws for high performance navigation. The robot vehicle is also equipped with visual servoing capability for various...
This paper present the implementation of an interactive dimension measurement system based on multiple image captures. The objective is to achieve the results comparable to the accurate measurements obtained from other precision measurement instruments while the low cost of the proposed technique. In the system, based on the spatial invariant principle for an object, we use a motion platform to drive...
In order to track the satellite, it is necessary to extract the pedestal kinematic equations by assuming to have the azimuth/elevation angles of satellite path. This paper deals with extracting of forward and inverse kinematic equations of the x/y pedestal with analysis of speed and extraction of singular points. Then equations are varied by the real Azimuth/Elevation of a LEO satellite. Finally the...
Generally, the ΔΣ modulator is widely used to suppress the influence of the quantization error. This method can shape the quantization error by a differentiator and shift its power to the high frequency range. From this reason, the influence of the quantization error can be suppressed in the low frequency range, where the main components of the control signal should have larger power. However, the...
This paper proposes a new scheduling method of dispatching and conflict-free routing for overhead hoist transport (OHT) systems in semiconductor fabrication (Fab). This paper utilizes a model predictive control (MPC) strategy in which the cycle of measurement, prediction, optimization and control is repeated. The first aim of the MPC application is to set a small prediction horizon for the scheduling...
In order to study the temperature distribution on the wafer in a rapid thermal processing system, we develop a reduced model of the dynamic based on the spectrum of the system operator. The dominant modes of the system are extracted through the analysis of the spectrum. Galerkin's method is utilized to construct the reduced model of the system with the dominant modes as the trial functions. Simulations...
Ontology can be seen as a knowledge sharing tool to communicate between different fields of knowledge. Each expert has their own way to design their ontologies using their own structures. This introduces a challenging problem of how to establish communication channels between these diversities. Ontology mapping is a good method to solve these problems by building relations between these ontologies...
This paper develops the design of an intelligent vehicle system with computer vision to achieve the purpose of moving-target following in an unknown indoor environment. The design of this system includes three major parts, namely target following, color image processing, and collision prevention. The proposed system using image processing can analyze and follow the moving-target with the interested...
In this study, Pareto optimality of controllers is investigated from the perspective of a system designer in a differential game. In the game, each player has their own cost function that must be minimized while competing for the control input, characterized by strategies of players. The controller design problem is formulated as a multiobjective optimization problem constrained by linear matrix inequalities...
This paper investigates decentralized output feedback control of continuous-time linear systems to fulfill frequency-domain specifications set on restricted frequency ranges. In particular, the controllers are not necessarily in block diagonal form. Solvability conditions are derived for both dynamic and static gain feedback cases. A numerical example is given which shows the validity of the proposed...
The manufacturers of small wind turbines generally provide basic parameters of their products, resulting in increased uncertainty upon evaluating the performance of small wind turbines. Therefore, the useful and accurate modeling of a small wind turbine is significant. This work discusses the modelling and control of a small wind turbine. The basic topology design and control principle for small wind...
This paper deals with the mixed H2/passivity performance controller design problem for truck-trailer stochastic system. Based on the Itô stochastic equation, the stochastic behavior of the system can be described by multiplicative noise. Using the H2 control scheme, the output energy of the system is minimized under initial conditions. Moreover, the passivity performance is applied to attenuate instable...
Many large wind farms have employed doubly fed induction generator (DFIG) variable speed wind turbines. These require accurate models of doubly fed induction generator wind turbines and their associated control and protection circuits. The goal of this paper is to study the theory and control for the doubly-fed induction generator (DFIG) based wind turbine, and further establish its model by using...
This paper discusses the design and verification of the operating procedure of the Attitude Determination and Control Subsystem (ADCS) of PHOENIX nanosatellite. As one of the satellites which joins the QB50 project, the main objective of PHOENIX is to perform in-situ measurements in the lower thermosphere. In order to meet the mission requirements, the attitude control system is required to stabilize...
This paper develops an Android face recognition application for users on mobile device, and applies it in the face verification system of Samsung Galaxy SII smart phone. The developed face recognition application includes three parts, the face detection using the Viola-Jones face detection program, the feature extraction implemented by the eigenface features, and the face recognition based on the...
This paper mainly focuses on the direct torque control (DTC) of the non-salient pole permanent magnet synchronous generator (PMSG). In the article, the PMSG model is developed clearly in the detail mathematical equation. Most of the three-phase electrical system would be analyzed in the complex plane by Clarke direct transformation. Because of this transformation, the calculation become much easier...
In order to deal with large and fast external disturbance, system uncertainties and system time delay, an adaptive fuzzy controller constructed by time delay fuzzy logic system (TDFLS) is proposed for unknown nonlinear time-delay systems which are infinite dimensional in nature. An adaptive time delay fuzzy logic system is used to approximate the unknown time delay system functions, in the meantime...
Diagnosis is implemented within safety-related control systems in order to reveal internal faults that could lead to a loss of the safety function, thus reducing the resulting values of the probability of failure on demand (PFD) and probability of failure per hour (PFH) of such systems. The question to be discussed in this paper is how to assess the effects of failures of the diagnostic facilities...
Earlier, Chao pioneered the very first closed-form solution of the number of reachable and other states for marked graphs (MG) and k-th order system which is the simplest class of S3PR (Systems of Simple Sequential Processes with Resources). This paper progresses one step further on enumerating reachable, forbidden and live states for Middle Left K-net systems (one nonsharing resource place in the...
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