電機工程學系
Permanent URI for this community
歷史沿革
本系成立宗旨在整合電子、電機、資訊、控制等多學門之工程技術，以培養跨領域具系統整合能力之電機電子科技人才為目標，同時配合產業界需求、支援國家重點科技發展，以「系統晶片」、「多媒體與通訊」、與「智慧型控制與機器人」等三大領域為核心發展方向，期望藉由學術創新引領產業發展，全力培養能直接投入電機電子產業之高級技術人才，厚植本國科技產業之競爭實力。
本系肇始於民國92年籌設之「應用電子科技研究所」，經一年籌劃，於民國93年8月正式成立，開始招收碩士班研究生，以培養具備理論、實務能力之高階電機電子科技人才為目標。民國96年8月「應用電子科技學系」成立，招收學士班學生，同時間，系所合一為「應用電子科技學系」。民國103年8月更名為「電機工程學系」，民國107年電機工程學系博士班成立，完備從大學部到博士班之學制規模，進一步擴展與深化本系的教學與研究能量。
News
Browse
Browsing 電機工程學系 by Author "C.C. Hsu"
Results Per Page
Sort Options

ItemApproximationransform using higher order integrators and its applications in sampleddata control systems(Taylor & Francis, 19980101) C.H. Wang ; C.C. Hsu ; W.Y. WangIn this paper, we first clarify the difference between the approximate z transform and the discrete equivalent of a continuous system using higherorder integrators. It is shown that a 1/ ts factor needs to be included for the approximate z transform but not for the discrete equivalent. We further apply the approximate z transform to facilitate the stability analysis of sampleddata control systems, with or without uncertain parameters, ft is shown in this paper that the approximate z transform greatly simplifies the stability analysis of a sampleddata control system, which is regarded as rather difficult ( if not impossible) to handle because of its transcendental nature. The results can be easily obtained and show reasonably good approximations with this approach. Several examples are used to illustrate the effectiveness of this new method.

ItemA composite controller for unknown nonlinear dynamical systems using robust adaptive fuzzyneural control schemes( 20000927) W.Y. Wang ; C.C. Hsu ; Y.G. LeuA robust adaptive fuzzyneural control scheme for nonlinear dynamical systems is proposed to attenuate the effects caused by unmodeled dynamics, disturbance and modeling errors. A composite update law, which has a generalized form combining the projection algorithm modification and the switchingσ adaptive law, is used to tune the adjustable parameters for preventing parameter drift and confining states of the system into the specified regions. Moreover, a fuzzy variable structure control method is incorporated into the control law so that the derived controller is robust with respect to unmodeled dynamics, disturbances and modeling errors. Compared with previous control schemes for nonlinear systems, the magnitude of the control input by using the proposed approach is much smaller, which is a significant advantage in designing controllers for practical applications. To demonstrate the effectiveness and applicability of the proposed method, several examples are illustrated in the paper

ItemDiscrete modeling of continuous interval using highorder integrators( 19990604) C.C. Hsu ; W.Y. WangA higherorder integrator approach is proposed to obtain an approximate discretetime transfer function for uncertain continuous systems having interval uncertainties. Thanks to simple algebraic operations of this approach, the resulting discrete model is a rational function of the uncertain parameters. The problem of nonlinearly coupled coefficients of exponential nature in the exact discretetime transfer function is therefore circumvented. Furthermore, interval structure of the uncertain continuoustime system is preserved in the resulting discrete model by using this approach. Formulas to obtain the lower and upper bounds for the discrete interval system are derived, so that existing robust results in the discretetime domain can be easily applied to the discretized system. Digital simulation and design for the continuoustime interval plant can then be performed based on the obtained discretetime interval model

ItemDiscrete modeling of uncertain continuous systems having an interval structure using higherorder integrators(Taylor & Francis, 20000101) C.C. Hsu ; W.Y. Wang

ItemDiscreteTime Model Reduction of Sampled Systems Using an Enhanced Multiresolutional Dynamic Genetic Algorithm( 20011010) C.C. Hsu ; K.M. Tse ; W.Y. WangA framework to automatically generate a reducedorder discretetime model for the sampled system of a continuous plant preceded by a zeroorder hold (ZOH) using an enhanced multiresolution dynamic genetic algorithm (EMDGA) is proposed in this paper. Chromosomes consisting of the denominator and the numerator parameters of the reducedorder model are coded as a vector with floatingpointtype components and searched by the genetic algorithm. Therefore, a stable optimal reducedorder model satisfying the error range specified can be evolutionarily obtained. Because of the use of the multiresolution dynamic adaptation algorithm and the genetic operators, the convergence rate of the evolution process to search for an optimal reducedorder model can be expedited. Another advantage of this approach is that the reduced discretetime model evolves based on samples taken directly from the continuous plant, instead of the exact discretetime model, so that computation time is saved

ItemDistance measurement based on pixel variation of CCD images(ISA, 20091001) C.C. Hsu ; M.C. Lu ; W.Y. Wang ; Y.Y. LuThis paper presents a distance measurement method based on pixel number variation ofimages for digital cameras by referencing to two arbitrarily designated points in image frames. Based on an established relationship between the displacement of the camera movement along the photographing direction and the difference in pixel counts between reference points in the images, distance from an object can be calculated via the proposed method. To integrate the measuring functions into digital cameras, circuit design implementing the proposed measuring system in selecting reference points, measuring distance, and displaying measurement results on CCD panel of the digital camera is proposed in this paper. In comparison to pattern recognition or image analysis methods, the proposed measuring approach is simple and straightforward for practical implementation into digital cameras. Experiment results have demonstrated that the proposed method is capable of yielding satisfactory measurement resultsin a very responsive way.

ItemDSPbased fuzzy neural networks and its application in speech recognition( 19991015) S.C. Chen ; C.C. Hsu ; W.Y. WangA fuzzyneural network needs to be trained through a learning process, so that suitable membership functions and weightings can be obtained. However, most neural networks are only simulated by computer software, which are not practical for real applications. It is therefore our objective to design an integrated circuit system based on a DSP processor with powerful arithmetical capabilities and fast data processing, and relevant peripheral devices to implement the fuzzy neural network. In terms of implementation cost and feasibility for practical applications, this DSPbased fuzzy neural network will be more practical and usable. Finally, a prospective application of the DSP processorbased fuzzy neural network to recognize speech from a nondesignated person is proposed

ItemFuzzyneural function approximation using a vector evaluation genetic algorithm( 20030101) W.Y. Wang ; C.C. Hsu ; C.W. Tao ; Y.H. Li

ItemA GAbased indirect adaptive fuzzyneural controller for uncertain nonlinear systems( 20021206) W.Y. Wang ; C.C. Hsu ; C.W. Tao ; Y.H. LiIn this paper, a novel approach to adjust both the control points of Bspline membership functions (BMFs) and the weightings of fuzzyneural networks using a reducedform genetic algorithm (RGA) is proposed. Chromosomes consisting of both the control points of BMFs and the weightings of fuzzyneural networks are coded as an adjustable vector with real number components and searched by the RGA. Moreover, we propose an application of the RGA in designing an RGAbased indirect adaptive fuzzyneural controller (RIAFC) for uncertain nonlinear dynamical systems. The free parameters of the indirect adaptive fuzzyneural controller can successfully be tuned online via the RGA approach. A supervisory controller is incorporated into the RIAFC to stabilize the closedloop nonlinear system. An example of a nonlinear system controlled by RIAFC are demonstrated to show the effectiveness of the proposed method.

ItemGAbased learning of BMF fuzzyneural network( 20020517) W.Y. Wang ; T.T. Lee ; C.C. Hsu ; Y.H. LiAn approach to adjust both control points of Bspline membership functions (BMFs) and weightings of fuzzyneural networks using a simplified genetic algorithm (SGA) is proposed. The SGA is proposed by using a sequentialsearchbased crossover point (SSCP) method in which a better crossover point is determined and only the gene at the specified crossover point is crossed as a single point crossover operation. Chromosomes consisting of both the control points of BMFs and the weightings of fuzzyneural networks are coded as an adjustable vector with real number components and searched by the SGA. Because of the use of the SGA, faster convergence of the evolution process to search for an optimal fuzzyneural network can be achieved. Nonlinear functions approximated by using the fuzzyneural networks via the SGA are demonstrated to illustrate the applicability of the proposed method

ItemGenetic algorithmsderived digital integrators and their applications in discretization of continuous systems( 20020101) C.C. Hsu ; W.Y. Wang ; C.Y. YuA set of enhanced digital integrators (EDI) with improved accuracy via genetic algorithms are proposed in this paper. By specifying a desired power for the integrator to be sought and the interval for comparison, chromosomes consisting of parameters of the enhanced digital integrator are then searched by the genetic algorithm based on root mean squared (RMS) error between the original integrator and candidates of the enhanced digital integrator. Thus, all the best parameters of an optimal enhanced digital integrator can be evolutionarily obtained. To demonstrate the effectiveness of the proposed approach, the derived enhanced digital integrators are used to obtain the discrete approximation for continuous systems.

ItemImpact of sampling time on tustin digitization(ACTA Press, 19960101) C.H. Wang ; W.Y. Wang ; C.C. HsuThis paper investigates the impact of sampling time on Tustin digitization. A Qmatrix representation for the digitized system via Tustin transformation is first proposed. It is shown that Tustin transformation is a special case of the higherorder integrator approaches to digitize a continuous system. Polevariation loci is then introduced to describe the trajectories of poles of the digitized system using Tustin transformation when sampling time is varied from zero to infinity. With new theorems derived in this paper, the polevariation loci can be easily sketched. Sampling time of any point on the polevariation loci of the digitized system can be determined by the angle of the vector drawn from the origin to the designated pole location. System dynamics of the digitized system can then be estimated from the sampling time, which determines the pole locations.

ItemA method of distance measurement by digital camera( 20061111) T.H. Wang ; C.C. Hsu ; C.P. Tsai ; M.C. Lu ; W.Y. Wang ; C.C. Chen

ItemMinimumphase criteria for sampled systems via symbolic approach( 19961213) C.H. Wang ; W.Y. Wang ; C.C. HsuIn this paper, we propose a symbolic approach to determine the samplingtime range which guarantees minimumphase behaviours for a sampled system with a zeroorder hold. By using Maple, a symbolic manipulation package, the symbolic transfer function of the sampled system, which contains sampling time T as an independent variable, can be easily obtained. We then adopt the critical stability constraints to determine the samplingtime range which ensures that the sampled system has only stable zeros. In comparison with existing methods, the approach proposed in this paper has less restrictions on the continuous plant and is very easy to implement in any symbolic manipulation packages. Several examples are illustrated to show the effectiveness of this approach

ItemMinimumphase criteria for sampled systems via symbolic approach(Taylor & Francis, 19970101) C.H. Wang ; W.Y. Wang ; C.C. HsuIn this paper, we propose a symbolic approach to determine the samplingtime range which guarantees minimumphase behaviours for a sampled system with a zeroorder hold. By using Maple, a symbolic manipulation package, the symbolic transfer function of the sampled system, which contains sampling time T as an independent variable, can be easily obtained. We then adopt the critical stability constraints to determine the samplingtime range which ensures that the sampled system has only stable zeros. In comparison with existing methods, the proposed approach in this note has less restrictions on the continuous plant and is very easy to implement in any symbolic manipulation package. Several examples are illustrated to show the effectiveness of this approach.

ItemModel reduction of discrete interval systems using genetic algorithms(World Scientific and Engineering Academy and Society (WSEAS), 20051101) C.C. Hsu ; T.C. Lu ; W.Y. WangIn this paper, an evolutionary approach is proposed to derive a reducedorder model for discretetime interval systems based on resemblance of discrete sequence energy between the original and reduced systems. With the use of the recursive algebraic algorithm and interval arithmetic manipulations, the problem to identify boundaries of the uncertain coefficients of the reducedorder model can be formulated as an optimization problem, which is subsequently solved by a proposed genetic algorithm. To demonstrate the effectiveness of the proposed approach, system performance of the reducedorder discrete interval model is validated based on time responses in comparison to existing approaches. Because of the timeconsuming process that genetic algorithms generally exhibit, particularly the problem nature which demands heavy calculation of the fitness function, a parallel computation scheme is also presented to accelerate the evolution process to derive the reducedorder model.

ItemA Practical Nighttime Vehicle Distance Alarm System( 20081015) M.C. Lu ; C.P. Tsai ; W.Y. Wang ; M.C. Chen ; C.C. Hsu ; Y. Y. LuThis paper presents a practical nighttime vehicle distance measuring method based on a single CCD image. The method combines an imagebased distance measuring system. To solve the nighttime feature extraction problem, the proposed method uses two taillights as the feature. Based on the proportionality of similar triangles, distance between a CCD camera and the taillights of the vehicle ahead can be measured. The method focuses on detecting the taillights and differentiating the targeted vehicle from others on the basis of partial image analysis instead of whole image processing. The system is both fast and simple. The accuracy of the proposed method is demonstrated in this paper through experiences.

ItemRobust adaptive fuzzyneural control of nonlinear dynamical systems using generalized projection update law and variable structure controller(IEEE Systems, Man, and Cybernetics Society, 20010201) W.Y. Wang ; Y.G. Leu ; C.C. HsuIn this paper, a robust adaptive fuzzyneural control scheme for nonlinear dynamical systems is proposed to attenuate the effects caused by unmodeled dynamics, disturbance, and modeling errors. A generalized projection update law, which generalizes the projection algorithm modification and the switchingσ adaptive law, is used to tune the adjustable parameters for preventing parameter drift and confining states of the system to the specified regions. Moreover, a variable structure control method is incorporated into the control law so that the derived controller is robust with respect to unmodeled dynamics, disturbances, and modeling errors. To demonstrate the effectiveness of the proposed method, several examples are illustrated in this paper

ItemThree Dimensional Measurement of Distant Objects Based on LaserProjected CCD Images(Institution of Engineering and Technology, 20090501) C.C. Hsu ; M.C. Lu ; W.Y. Wang ; Y.Y. LuA novel measuring system based on a single CCD camera and two laser projectors to record images and perform threedimensional measurement of a distant object is proposed here. Because of the alignment of the laser beams which form in parallel with the optical axis of the CCD camera, projected spots will appear on the same scan line in a CCD image. As a result processing of a single scan line rather than the whole image is only required to identify the projected spots in the CCD image. Complex computation of video signals of the whole image via either pattern recognition or image analysis methods is therefore circumvented. On the basic of an established relationship between the distance and pixel counts between the projected spots in the CCD image, the proposed system not only measures the distance from a distant object but also the length of two arbitrarily designated points on the object. To provide better accuracy, intrinsic parameters of the CCD camera are taken into consideration in the measurement. Furthermore, the effect of laser diffusion is also proved to be irrelevant to the measuring accuracy here. Experimental results have demonstrated that the proposed measuring method is capable of yielding accurate results of threedimensional measurement for a distant object in a very responsive way.