Chung Yuan Christian University is a private university in Zhongli District, Taoyuan City, Taiwan. The university was established as Chung Yuan Christian College of Science and Engineering in 1955 by a group of Taiwanese and American Christian educators to train science and engineering talent in the Christian spirit. The school was upgraded to a full university and renamed Chung Yuan Christian University in 1980. Wikipedia.
Chiu C.-S.,Chung Yuan Christian University
Automatica | Year: 2012
This paper presents derivative and integral terminal sliding mode control (TSMC) for a class of MIMO nonlinear systems in a unified viewpoint. First, integral TSMC is developed for robust output tracking of uncertain relative-degree-one systems by introducing sign and fractional integral terminal sliding modes. Next, by combining derivative and integral terminal sliding modes in a recursive structure, two derivative-integral terminal sliding mode control (DI-TMSC) methods are proposed to achieve exact or approximate finite-time convergence for the output tracking of higher order nonlinear systems. Different from traditional TSMC, this paper accomplishes finite convergence time for more general high-order MIMO systems and avoids the singular problem in the controller design. Furthermore, the control system is forced to start on the terminal sliding hyperplane, so that the reaching time of the sliding modes is eliminated. In other words, the transient response is improved under more relaxed stability conditions. Finally, several numerical simulations and experiments show the expected control performance. © 2011 Elsevier Ltd. All rights reserved.
Chen H.-T.,Chung Yuan Christian University
Journal of Physical Chemistry C | Year: 2012
The interaction and mechanism for CO oxidation on a Ru-modified CeO 2 surface have been investigated by using periodic density functional theory calculations corrected with the on-site Coulomb interaction via a Hubbard term (DFT + U). Our calculations showed that (i) the Ru dopant facilitates oxygen vacancy formation, while the Ru adatoms may suppress oxygen vacancy formation. (ii) Physisorbed CO, physisorbed CO 2, and chemisorbed CO (carbonite, CO 2 -) species are observed on the Ru-doped CeO 2(111) surface; in contrast, only physisorbed CO is found on the clean CeO 2(111) surface. The vibrational frequency calculations are carried to characterize these species. (iii) Incorporating Ru ions into the ceria lattice as substitutional point defects can instead sustain a full catalytic cycle for CO oxidation and catalyst regeneration. The Ru dopant promotes CO oxidation without any activation energy leading to O vacancy formation and CO 2 desorption. Molecular O 2 adsorbs at the O vacancy forming O adspecies that then drive CO oxidation and recover the stoichiometric Ru-doped CeO 2 surface. The Bader charge analysis is carried to characterize the oxidation state of Ru ions along the catalytic cycle. © 2012 American Chemical Society.
Chen S.-L.,Chung Yuan Christian University
IEEE Transactions on Circuits and Systems for Video Technology | Year: 2013
In this paper, a low-complexity adaptive edge-enhanced algorithm is proposed for the implementation of 2-D image scaling applications. The proposed novel algorithm consists of a linear space-variant edge detector, a low complexity sharpening spatial filter, and a simplified bilinear interpolation. The edge detector is designed to discover the image edges by a low-cost edge-catching technique. The sharpening spatial filter is added as a prefilter to reduce the blurring effect produced by the bilinear interpolation. Furthermore, an adaptive technology is used to enhance the effect of the edge detector by adaptively selecting the input pixels of the bilinear interpolation. In addition, an algebraic manipulation and a hardware sharing techniques are used to simplify bilinear interpolation, which efficiently reduces the computing resources and silicon area in very large scale integration (VLSI) circuits. By adding eight 8-bit registers as a register bank, this design can process streaming data directly and requires only a one-line-buffer memory. The VLSI architecture of this paper contains 6.67-K gate counts and achieves about 280-MHz processing rate by using the TSMC 0.13-um CMOS process. Compared with previous low-complexity techniques, this paper performs with better quality, higher performance, less memory requirements, and lower hardware cost than other image scaling methods. © 1991-2012 IEEE.
Yu-Hsin Chen G.,Chung Yuan Christian University
International Journal of Production Economics | Year: 2013
A dynamic facility layout problem (DFLP) is concerned with finding a set of facility layouts across multiple time periods that minimizes the total cost of material flows and rearrangement costs. Unlike other heuristic approaches that focus mainly on the searching aspect, this research takes another approach by streamlining the data structure of solution representation to improve the solution swapping and storing activities within a meta-heuristic framework. The experimental results from testing the data encoding and decoding schemes on a DFLP data set have been quite promising in terms of solution quality and computational time. © 2012 Elsevier B.V.
Kuo T.C.,Chung Yuan Christian University
Computers and Industrial Engineering | Year: 2013
The Industry Council for Electronic Equipment Recycling (ICER) has published estimates of waste generation based on both assumptions and analysis regarding the relationship between the market sales of Electrical and Electronic Equipment (EEE) in a given year and the expected lifetime of products as well as by employing market saturation factors. Waste EEE (WEEE) has an adverse impact on the environment. Therefore, it is important to reduce the quantity of WEEE through recycling. While attempting to improve the recycling rate of WEEE by enhancing the disassembly processes, two issues must be considered simultaneously-economy and safety. In this paper, a Petri Net (PN) based analysis approach is proposed to deal with the disassembly and recycling problems in End-Of-Life (EOL) WEEE. By using the PN analysis, the optimal tradeoff between the cost and environmental effectiveness of the disassembly processes is determined. A case study is used to illustrate the proposed analysis method. © 2012 Elsevier Ltd. All rights reserved.