Lee H.-Y.,National Ilan University
Journal of Computing in Civil Engineering | Year: 2012
A good layout of the service facilities in a station can reduce the total walking distance of passengers to and from various facilities. It improves the overall service efficiency and quality of the station. Over time the original layout of a station may become unsuitable. This is often due to the changes in the number of passengers, the types of passengers, and the surrounding environment. In such cases, a comprehensive review of the layout should be conducted. However, the layouts possible are numerous and should be investigated using quantitative evaluation. This paper proposes an integrated model that estimates the total walking time of a passenger by simulation and searches for a near-optimal layout by ant colony optimization. A high-speed railway station is employed as a case study to evaluate the feasibility of the proposed model. The results indicate that the proposed model can effectively save passengers time and improve the service efficiency of the station. © 2012 American Society of Civil Engineers.
Huang H.-C.,National Ilan University
IEEE Transactions on Industrial Informatics | Year: 2013
This paper presents an embedded system-on-a-programmable-chip (SoPC)-based parallel ant colony optimization (ACO) algorithm and its application to optimal motion controller design for intelligent omnidirectional mobile robots. Both polar-space parallel ACO (PACO) parameter tuner and kinematic motion controller are integrated in one field programmable gate arrays chip to efficiently construct an intelligent omnidirectional mobile robot. The optimal parameters of the motion controllers are obtained by minimizing the performance index using the proposed SoPC-based PACO algorithm. These polar-space optimal parameters are then employed in the PACO-based embedded kinematic motion controller to achieve trajectory tracking and stabilization. Experimental results are conducted to show the effectiveness and merit of the proposed PACO algorithm for embedded controllers of omnidirectional mobile robots. These results indicate that the proposed PACO-based embedded optimal controller outperforms the nonoptimal controllers and the conventional genetic algorithm optimal controllers in polar coordinates. © 2005-2012 IEEE.
Yeh M.-H.,National Ilan University
Signal Processing | Year: 2012
A new method for computing complex bidimensional empirical mode decomposition (BEMD) is presented in this paper. The proposed complex-BEMD uses four quadrant spectra to apply standard BEMD to four real-valued 2D signals. The so-generated intrinsic mode functions (IMFs) are 2D complex-valued, which facilitates the extension of the standard BEMD to the complex domain. The proposed complex-BEMD can be successful for the analysis of real-world 2D complex-valued signals, such as 2D NMR signals. Moreover, the proposed complex-BEMD can be applied for color image processing. A simple color image fusion algorithm based upon the proposed complex-BEMD has also been developed to have the exhibition of the potential. By our proposed complex-BEMD and image fusion algorithm, the well-fused results can be obtained, if the mode mixing in BEMD is alleviated. © 2011 Elsevier B.V. All Rights Reserved.
Chang S.H.,National Ilan University
Materials Chemistry and Physics | Year: 2011
Cu-XAl-4Ni shape memory alloys (SMAs) are capable of martensitic transformation across a wide temperature range through the precise adjustment of their chemical composition from X = 13.0 to 14.5. In addition, the variations in chemical composition significantly influence the internal friction characteristics of Cu-XAl-4Ni SMAs. Cu-XAl-4Ni SMAs with a higher content of Al exhibit lower internal friction peaks due to decreases in the amount of transformed martensite and the formation of γ2 phase precipitates. The damping capacity of the inherent and intrinsic internal friction for Cu-13.5Al-4Ni SMA is extremely low due to the fact that the transformed β′1(18R) martensite has only an ordered 9R structure with stacking faults. The Cu-14.0Al-4Ni SMA exhibits a relative increase in the inherent and intrinsic damping capacity because the transformed γ′1(2H) martensite exhibits twinning with abundant moveable twin boundaries. © 2010 Elsevier B.V. All rights reserved.
Huang H.-C.,National Ilan University
Applied Artificial Intelligence | Year: 2013
This article presents an intelligent system-on-a-programmable-chip-based (SoPC) ant colony optimization (ACO) motion controller for embedded omnidirectional mobile robots with three independent driving wheels equally spaced at 120 degrees from one another. Both ACO parameter autotuner and kinematic motion controller are integrated in one field-programmable gate array (FPGA) chip to efficiently construct an experimental mobile robot. The optimal parameters of the motion controller are obtained by minimizing the performance index using the proposed SoPC-based ACO computing method. These optimal parameters are then employed in the ACO-based embedded kinematic controller in order to obtain better performance for omnidirectional mobile robots to achieve trajectory tracking and stabilization. Experimental results are conducted to show the effectiveness and merit of the proposed intelligent ACO-based embedded controller for omnidirectional mobile robots. These results indicate that the proposed ACO-based embedded optimal controller outperforms the nonoptimal controllers and the conventional genetic algorithm (GA) optimal controllers. © 2013 Taylor & Francis Group, LLC.