Evolutionary Synthesis Method Research Articles

Combined evolutionary method of feasible directions in multicriteria synthesis problem of a dynamical system program control

The paper considers the evolutionary synthesis method of multi-criteria program control for dynamic systems. A computational technology involves the combined using of evolutionary finite-dimensional and infinite-dimensional multi-criteria optimization algorithms. A computational technology involves the combined using of evolutionary finite-dimensional and infinite-dimensional multicriteria optimization algorithms. Finite-dimensional multi-criteria optimization evolutionary algorithms are used to construct a discrete approximation of ε-effective solutions set. Infinite-dimensional multicriteria optimization evolutionary algorithms implement the stage of clarifying search, represent generalization of possible directions methods and use ε-effective solutions as initial approximations.

Evaluations of Feature Extraction Programs Synthesized by Redundancy-removed Linear Genetic Programming: A Case Study on the Lawn Weed Detection Problem

This paper presents an evolutionary synthesis of feature extraction programs for object recognition. The evolutionary synthesis method employed is based on linear genetic programming which is combined with redundancy-removed recombination. The evolutionary synthesis can automatically construct feature extraction programs for a given object recognition problem, without any domain-specific knowledge. Experiments were done on a lawn weed detection problem with both a low-level performance measure, i.e., segmentation accuracy, and an application-level performance measure, i.e., simulated weed control performance. Compared with four human-designed lawn weed detection methods, the results show that the performance of synthesized feature extraction programs is significantly better than three human-designed methods when evaluated with the low-level measure, and is better than two human-designed methods according to the application-level measure.

Evolutionary synthesis of low-sensitivity digital filters using adjacency matrix

An evolutionary synthesis method to generate digital filters with low coefficient sensitivity is presented. The method uses a chromosome coding based on the graph adjacency matrix representation. It is shown that the proposed chromosome representation enables to easily verify and avoid the generation of topologically invalid and non-computable individuals during the evolutionary process. The efficiency of the proposed algorithm is tested in the synthesis of two low-pass digital filters and the results are compared with other examples found in the literature.

The Young Star Clusters Parameters in Late Type Spiral Galaxies

An analysis of parameters of the 566 young star clusters in the 35 late type spiral and irregular galaxies is presented. The disposition, the sizes and the colors of the star clusters are studied, based on the multicolor surface photometry data. The ages of the young star clusters are estimated using evolutionary synthesis method. A problem of taking into account the dust contribution is discussed. Most of the clusters are located in the Inner Lindblad Resonance ring and in other resonance rings. In some ring galaxies the distances between neighbouring star clusters are similar. For some of investigated galaxies, the star clusters belonging to a given galaxy have similar ages. A correlation between age and size of star forming regions exists. The younger objects have smaller average sizes. There are no single star forming regions with sizes > 550 pc. In general, the star forming regions in a given galaxy have similar sizes. A correlation between maximal diameter of star clusters and absolute blue magnitude of parental galaxy exists.

Sizes and ages of star forming regions in galaxies

Results of a multicolor surface photometry of 71 star forming regions in the nine late type spiral and irregular galaxies are presented. The sizes and the colors of the star forming regions are studied. The ages of the star forming regions are estimated using evolutionary synthesis method. Two groups of galaxies are distinguished. Within the first group of galaxies, the star forming regions belonging to a given galaxy have approximately the same age. In the second group, both young (from 1Myrs ) and intermediate age (several Gyrs ) star forming regions are observed. A correlation between the age and the size of star forming regions exists. A distribution of the star forming regions by size shows a maximum at 100-400 pc. It corresponds to stellar aggregations sizes (by Efremov) in hierarchical scale of star formation. A correlation between maximal diameters of the star forming regions and an absolute blue magnitude of a parental galaxy exists.

Star forming regions in disks of galaxies

Abstract An analysis of the parameters of 71 star forming regions in nine late type spiral galaxies is presented. It is based on multicolor surface photometry data. The ages of the star forming regions are estimated using the evolutionary synthesis method. In most galaxies, the star forming regions are usually located in the resonance rings. The star forming regions belonging to a given galaxy have approximately the same age. The investigation of the distribution of star forming regions by the distance between neighbouring star forming regions shows that a special distance scale exists for ring galaxies.

Evolutionary synthesis method of energy integrated distillation separation process

AbstractA two‐stage evolutionary method is developed to synthesize an optimal energy integrated distillation separation process: the search of the separation sequence, and the introduction of energy integration to the given separation sequence. For the former an evolutionary procedure first generating initial separation sequences and then evolving them is developed. For the latter an evolutionary procedure, first indicating the direction of the evolution by the thermodynamic analysis and then estimating it based on the objective function, is developed. An example problem of a five‐component separation demonstrates the effectiveness of this proposed method.