The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Victor O K Li - One of the best experts on this subject based on the ideXlab platform.
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real coded Chemical Reaction optimization
IEEE Transactions on Evolutionary Computation, 2012Co-Authors: Victor O K Li, James J Q YuAbstract:Optimization problems can generally be classified as continuous and discrete, based on the nature of the solution space. A recently developed Chemical-Reaction-inspired metaheuristic, called Chemical Reaction optimization (CRO), has been shown to perform well in many optimization problems in the discrete domain. This paper is dedicated to proposing a real-coded version of CRO, namely, RCCRO, to solve continuous optimization problems. We compare the performance of RCCRO with a large number of optimization techniques on a large set of standard continuous benchmark functions. We find that RCCRO outperforms all the others on the average. We also propose an adaptive scheme for RCCRO which can improve the performance effectively. This shows that CRO is suitable for solving problems in the continuous domain.
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Chemical Reaction optimization a tutorial
Memetic Computing, 2012Co-Authors: Victor O K LiAbstract:Chemical Reaction Optimization (CRO) is a recently established metaheuristics for optimization, inspired by the nature of Chemical Reactions. A Chemical Reaction is a natural process of transforming the unstable substances to the stable ones. In microscopic view, a Chemical Reaction starts with some unstable molecules with excessive energy. The molecules interact with each other through a sequence of elementary Reactions. At the end, they are converted to those with minimum energy to support their existence. This property is embedded in CRO to solve optimization problems. CRO can be applied to tackle problems in both the discrete and continuous domains. We have successfully exploited CRO to solve a broad range of engineering problems, including the quadratic assignment problem, neural network training, multimodal continuous problems, etc. The simulation results demonstrate that CRO has superior performance when compared with other existing optimization algorithms. This tutorial aims to assist the readers in implementing CRO to solve their problems. It also serves as a technical overview of the current development of CRO and provides potential future research directions.
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Chemical Reaction optimization for task scheduling in grid computing
IEEE Transactions on Parallel and Distributed Systems, 2011Co-Authors: Jin Xu, Victor O K LiAbstract:Grid computing solves high performance and high-throughput computing problems through sharing resources ranging from personal computers to supercomputers distributed around the world. One of the major problems is task scheduling, i.e., allocating tasks to resources. In addition to Makespan and Flowtime, we also take reliability of resources into account, and task scheduling is formulated as an optimization problem with three objectives. This is an NP-hard problem, and thus, metaheuristic approaches are employed to find the optimal solutions. In this paper, several versions of the Chemical Reaction Optimization (CRO) algorithm are proposed for the grid scheduling problem. CRO is a population-based metaheuristic inspired by the interactions between molecules in a Chemical Reaction. We compare these CRO methods with four other acknowledged metaheuristics on a wide range of instances. Simulation results show that the CRO methods generally perform better than existing methods and performance improvement is especially significant in large-scale applications.
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Chemical Reaction inspired metaheuristic for optimization
IEEE Transactions on Evolutionary Computation, 2010Co-Authors: Victor O K LiAbstract:We encounter optimization problems in our daily lives and in various research domains. Some of them are so hard that we can, at best, approximate the best solutions with (meta-) heuristic methods. However, the huge number of optimization problems and the small number of generally acknowledged methods mean that more metaheuristics are needed to fill the gap. We propose a new metaheuristic, called Chemical Reaction optimization (CRO), to solve optimization problems. It mimics the interactions of molecules in a Chemical Reaction to reach a low energy stable state. We tested the performance of CRO with three nondeterministic polynomial-time hard combinatorial optimization problems. Two of them were traditional benchmark problems and the other was a real-world problem. Simulation results showed that CRO is very competitive with the few existing successful metaheuristics, having outperformed them in some cases, and CRO achieved the best performance in the real-world problem. Moreover, with the No-Free-Lunch theorem, CRO must have equal performance as the others on average, but it can outperform all other metaheuristics when matched to the right problem type. Therefore, it provides a new approach for solving optimization problems. CRO may potentially solve those problems which may not be solvable with the few generally acknowledged approaches.
A Md I Ismail - One of the best experts on this subject based on the ideXlab platform.
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mhd stagnation point flow and heat transfer impinging on stretching sheet with Chemical Reaction and transpiration
Chemical Engineering Journal, 2015Co-Authors: Fazle Mabood, Waqar A Khan, A Md I IsmailAbstract:Abstract This work is focused on the study of combined heat and mass transfer by MHD stagnation point flow toward a permeable stretching surface in the presence of a first order Chemical Reaction. The governing equations for the flow, heat and mass transfer are formulated and solved analytically using the homotopy analysis method (HAM). Graphical and numerical demonstrations of the convergence of the HAM solutions are provided. A detailed study illustrating the influences of the magnetic, velocity ratio, suction/injection and Chemical Reaction parameters, the Schmidt and Prandtl numbers on the dimensionless velocity, temperature as well as the skin-friction and the Nusselt and Sherwood numbers is conducted. The results obtained show that the flow field is substantially influenced by the presence of Chemical Reaction, transpiration, and magnetic field.
Carsten Conradi - One of the best experts on this subject based on the ideXlab platform.
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Chemical Reaction Systems with Toric Steady States
Bulletin of Mathematical Biology, 2012Co-Authors: Mercedes Pérez millán, Alicia Dickenstein, Anne Shiu, Carsten ConradiAbstract:Mass-action Chemical Reaction systems are frequently used in computational biology. The corresponding polynomial dynamical systems are often large (consisting of tens or even hundreds of ordinary differential equations) and poorly parameterized (due to noisy measurement data and a small number of data points and repetitions). Therefore, it is often difficult to establish the existence of (positive) steady states or to determine whether more complicated phenomena such as multistationarity exist. If, however, the steady state ideal of the system is a binomial ideal, then we show that these questions can be answered easily. The focus of this work is on systems with this property, and we say that such systems have toric steady states. Our main result gives sufficient conditions for a Chemical Reaction system to have toric steady states. Furthermore, we analyze the capacity of such a system to exhibit positive steady states and multistationarity. Examples of systems with toric steady states include weakly-reversible zero-deficiency Chemical Reaction systems. An important application of our work concerns the networks that describe the multisite phosphorylation of a protein by a kinase/phosphatase pair in a sequential and distributive mechanism.
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Chemical Reaction systems with toric steady states
arXiv: Dynamical Systems, 2011Co-Authors: Mercedes Perez Millan, Alicia Dickenstein, Anne Shiu, Carsten ConradiAbstract:Mass-action Chemical Reaction systems are frequently used in Computational Biology. The corresponding polynomial dynamical systems are often large (consisting of tens or even hundreds of ordinary differential equations) and poorly parametrized (due to noisy measurement data and a small number of data points and repetitions). Therefore, it is often difficult to establish the existence of (positive) steady states or to determine whether more complicated phenomena such as multistationarity exist. If, however, the steady state ideal of the system is a binomial ideal, then we show that these questions can be answered easily. The focus of this work is on systems with this property, and we say that such systems have toric steady states. Our main result gives sufficient conditions for a Chemical Reaction system to have toric steady states. Furthermore, we analyze the capacity of such a system to exhibit positive steady states and multistationarity. Examples of systems with toric steady states include weakly-reversible zero-deficiency Chemical Reaction systems. An important application of our work concerns the networks that describe the multisite phosphorylation of a protein by a kinase/phosphatase pair in a sequential and distributive mechanism.
R Kandasamy - One of the best experts on this subject based on the ideXlab platform.
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effects of Chemical Reaction heat and mass transfer on mhd flow past a semi infinite plate
Zamm-zeitschrift Fur Angewandte Mathematik Und Mechanik, 2000Co-Authors: S Anjali P Devi, R KandasamyAbstract:An approximate numerical solution for the steady MHD flow over an infinite horizontal plate in the presence of species concentration and Chemical Reaction has been obtained by solving the non-linear governing equations using R. K. Gill's method. The fluid is assumed to be viscous, incompressible, and electrically conducting. A uniform transverse magnetic field is applied. It has been observed that in the presence of Chemical Reaction (1) the velocity and the concentration decrease with increase of the Chemical Reaction parameter and vice versa, (2) the velocity decreases and the concentration is uniform with increase of the magnetic parameter and vice versa.
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effects of Chemical Reaction heat and mass transfer on laminar flow along a semi infinite horizontal plate
Heat and Mass Transfer, 1999Co-Authors: S P Anjalidevi, R KandasamyAbstract:An approximate solution for the steady laminar flow along a semi infinite horizontal plate in the presence of species concentration and Chemical Reaction has been obtained using Numerical Technique. It has been observed that in the presence of Chemical Reaction, (i) the velocity and concentration increase with decrease of Schmidt number Sc. (ii) Skin friction and rate of concentration decrease with the increase of Chemical Reaction parameter.
James I Lathrop - One of the best experts on this subject based on the ideXlab platform.
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robust combinatorial circuits in Chemical Reaction networks
International Conference on Theory and Practice of Natural Computing, 2017Co-Authors: Samuel J Ellis, Titus H Klinge, James I LathropAbstract:We introduce a general method for compiling any combinatorial circuit into an input/output Chemical Reaction network (I/O CRN). An I/O CRN receives a robust input signal over time, processes it catalytically to produce an output signal, and operates under deterministic mass action semantics (mass action kinetics). Our construction is reusable in the sense that it continues to operate correctly under changing input signals, and we prove that the construction is robust with respect to perturbations in (1) input signals; (2) initial concentrations; (3) rate constants; and (4) output measurements.
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TPNC - Robust Combinatorial Circuits in Chemical Reaction Networks.
Theory and Practice of Natural Computing, 2017Co-Authors: Samuel J Ellis, Titus H Klinge, James I LathropAbstract:We introduce a general method for compiling any combinatorial circuit into an input/output Chemical Reaction network (I/O CRN). An I/O CRN receives a robust input signal over time, processes it catalytically to produce an output signal, and operates under deterministic mass action semantics (mass action kinetics). Our construction is reusable in the sense that it continues to operate correctly under changing input signals, and we prove that the construction is robust with respect to perturbations in (1) input signals; (2) initial concentrations; (3) rate constants; and (4) output measurements.