Qu B.Y.,Zhongyuan University of Technology |
Suganthan P.N.,Nanyang Technological University |
Das S.,Indian Statistical Institute
IEEE Transactions on Evolutionary Computation | Year: 2013
Multimodal optimization amounts to finding multiple global and local optima (as opposed to a single solution) of a function, so that the user can have a better knowledge about different optimal solutions in the search space and when needed, the current solution may be switched to a more suitable one while still maintaining the optimal system performance. Niching particle swarm optimizers (PSOs) have been widely used by the evolutionary computation community for solving real-parameter multimodal optimization problems. However, most of the existing PSO-based niching algorithms are difficult to use in practice because of their poor local search ability and requirement of prior knowledge to specify certain niching parameters. This paper has addressed these issues by proposing a distance-based locally informed particle swarm (LIPS) optimizer, which eliminates the need to specify any niching parameter and enhance the fine search ability of PSO. Instead of using the global best particle, LIPS uses several local bests to guide the search of each particle. LIPS can operate as a stable niching algorithm by using the information provided by its neighborhoods. The neighborhoods are estimated in terms of Euclidean distance. The algorithm is compared with a number of state-of-the-art evolutionary multimodal optimizers on 30 commonly used multimodal benchmark functions. The experimental results suggest that the proposed technique is able to provide statistically superior and more consistent performance over the existing niching algorithms on the test functions, without incurring any severe computational burdens. © 1997-2012 IEEE.
Liu Z.,Zhongyuan University of Technology |
Wang X.C.,Zhongyuan University of Technology
Journal of Electromagnetic Waves and Applications | Year: 2012
The influence of fabric weave type on the shielding effectiveness (SE) of electromagnetic shielding fabric (ESF) is studied in this paper. Some representative samples with different weaves are manufactured to test the SE using the waveguide testing system. The SE of each sample is obtained at different frequencies of the emission resource. Experimental results show that the yarn float which causes the aperture change of metal fiber arrangement is the key influencing factor without changing other parameters of fabric. Then, a new theory that the SE of the ESF with different weave types is determined by the number of the yarn floats in a weave repeat that is proposed. An evaluation model of the SE for the ESF with any weave type is established. By further verification, the results show that the method is satisfied and can be a basis for the evaluation of SE of the ESF with different weave types when other structural parameters of the fabric are not changed. The variation revealed in this paper can provide a theoretical guidance for the design, production, and evaluation of the ESF. © 2012 Taylor & Francis.
Sun F.,Zhongyuan University of Technology
Advanced Materials Research | Year: 2011
Inspired by the potential interesting ideas of the danger theory, a novel security evaluation paradigm for network security, it is called DTPSE, is proposed in this paper. Within DTPSE, computer network attacks are regarded as bacterium, which are dangerous, and induce danger signals through simulating cells undergoing injury, or stress or 'bad cell death'; the network evaluation centre can dynamically aware the security risk by fusion the danger signals received from host-based sensors. Theoretical analysis shows that the proposed paradigm is feasible. Thus, it provides a novel solution to information security risk assessment. © (2011) Trans Tech Publications, Switzerland.
Wang A.,Zhongyuan University of Technology |
Deng M.,Tokyo University of Agriculture and Technology
Transactions of the Institute of Measurement and Control | Year: 2013
In this paper, an operator-based robust nonlinear multivariable tracking control for a manipulator with uncertainties is proposed by using a robust right coprime factorization approach. In general, there exist unknown modelling errors in measuring structural parameters of the manipulator and external disturbances in real situations. In the present control system design, the effect of the modelling errors and disturbance on system performance is considered to be uncertainties in the manipulator dynamics. Considering the uncertainties, an operator-based robust nonlinear multivariable tracking control using robust right coprime factorization is studied. That is, firstly a robustly stable control based on robust right coprime factorization is designed. Secondly, a robust nonlinear multivariable tracking system is proposed for improving the trajectory of the manipulator, and the output tracking performance is evaluated based on the exponential iteration theorem. Finally, the effectiveness of the designed system is confirmed by simulation results. © The Author(s) 2013.
Gong W.,Zhongyuan University of Technology |
Duan X.,Zhongyuan University of Technology
Waste Management | Year: 2010
Oxidation of landfill leachate wastewater was studied in a transpiring-wall SCWO reactor, operated under varied temperature and pressure 320-430°C, 18-30MPa. Effect of temperature and pressure on COD and BOD removal efficiency was investigated. COD and BOD removal efficiency being 99.23%, 98.06% were achieved at 430°C, 30MPa, which increased with temperature and pressure. The modified pseudo first-order rate model was regressed from experimental data, taking into account the induction time (tind) effect. The resulting pre-exponential factor A and activation energy Ea were 34.86s-1 and 32.1kJmol-1, respectively, assuming that the reaction order for feed wastewater (based on COD) and oxidant were first order and zero order, respectively. © 2010 Elsevier Ltd.
Zheng T.,Zhongyuan University of Technology
Textile Research Journal | Year: 2010
This paper presents a general method for modeling a 3D photorealistic single yarn for the construction of a fabric structure composed of the yarn with different types of cross sections. Various types of cross sections can be designed by using a quasi-uniform quadratic B-spline curve. The central line of the yarn is designed by a sequence of key control points to form a shape-preserving quasi-uniform cubic B-spline curve. The control grid of the B-spline surface for the single yarn is based on the combination of the quadratic and cubic curve. With random turbulence and proper assemblage of the cross sections, a realistic 3D twist effect for the single yarn is achieved. The simulated pictures of the yarns and fabrics indicate that this general and flexible model can be applied to the simulation of various 3D geometrical structures of yarns and then extended to fabrics. © 2010 The Author(s).
Zhang X.-L.,Zhongyuan University of Technology
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012
Study on series X80 pipeline steels shows that microstructure of the steels is characteristic of accicular ferrite containing grannular bainite; the finer size of grannular bainite is, the better the strength and toughness of the steel are. In grannular bainite, the effect of M-A island is to hinder growth of crack, and the grain boundary and island boundary is favourable for formation of crack. Ductility and toughness of pipeline steels depends on the effective grain size. Ductile-brittle transition temperature decreases with decreasing the effective grain size too, but reduction of area increases. With the increase of slow tension rate, the fracture mode is changed. When the tension rate is 0.1 mm/s, the steels exhibit best tensility and strength of the steels keeps un-changed. Increasing the tension rate, the fracture mode is changed to the brittle.
Wang X.C.,Zhongyuan University of Technology |
Liu Z.,Zhongyuan University of Technology
Progress in Electromagnetics Research Letters | Year: 2012
In this paper, a new computation model of the shielding effectiveness (SE) is proposed in order to calculate the SE of blended electromagnetic shielding fabric (BESF) by some fabric structural parameters. Some computation equations of the SE for the BESF are given according to the theoretical deduction and previous experimental results. And then a shielding coefficient in the computation model is determined by further experiments. The linear region boundary for the model is introduced to segment the computation of the SE. Results show that the SE obtained from the proposed model is consistent with that from experiments and the error is less than 2%. It can be concluded that the proposed model can accurately calculate the SE of plain, twill and satin weaves fabrics.
Zhu F.,Zhongyuan University of Technology
Journal of Power Sources | Year: 2013
The short communication presents an improved fractal model to predict through-plane liquid water permeability of the gas diffusion layer (GDL) in proton exchange membrane fuel cells (PEMFCs). The porous structure of a GDL is modeled as a combination of parallel and perpendicular channels to the fluid flow direction. The through-plane permeability equation is derived by a hybrid of fractal longitudinal permeability and transverse permeability in parallel with the former. This model is validated by comparing with the referenced data. It is found that the proposed fractal model is preferred for through-plane permeability predictions of GDL. © 2013 Elsevier B.V. All rights reserved.
Li S.-S.,Zhongyuan University of Technology |
Chen R.-X.,Zhongyuan University of Technology
Computers and Industrial Engineering | Year: 2014
We consider the problem of scheduling n jobs in batches on a single parallel-batching machine, where the jobs are partitioned into jobs families and the jobs in each family have the same due date. The objective is to minimize the weighted number of tardy jobs. We first devise an efficient pseudo-polynomial time and a fully polynomial time approximation scheme for the weighted problem. Then we present O(n2)-time and O(nlogn)-time algorithms for the case where the jobs have the same weight and for the case where the jobs have the same processing time, respectively. © 2014 Elsevier Ltd. All rights reserved.