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求解约束优化问题的人工鱼群算法 总被引:2,自引:0,他引:2
在利用人工鱼群算法求解约束问题时,处理好约束条件是取得好的优化效果的关键。引入了半可行域的概念,并结合人工鱼群算法(ArtificialFish-SwarmAlgorithm,AFSA)本身的特点,设计了基于竞争选择和惩罚函数的适应度函数,从而得到了一个利用ASFA算法求解约束优化问题的新的进化算法。实验证明了算法的有效性。 相似文献
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免疫接种粒子群的聚类算法 总被引:2,自引:0,他引:2
将粒子群优化算法和K均值算法结合进行聚类分析,同时引入了免疫系统中的免疫接种和免疫选择机制来指导粒子的迭代过程,提出了一种基于免疫接种粒子群的聚类算法,在粒子群迭代的过程中加入免疫接种机制指导粒子的飞行方向,再通过免疫选择机制对接种的结果进行选择,确保粒子种群向更优的方向移动。实验结果证明,基于免疫接种粒子群的聚类算法基本克服了K均值算法容易受初始聚类中心影响的缺点,聚类结果稳定,而且比基于粒子群优化的聚类算法取得了更好的聚类效果。 相似文献
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目前,高性能计算已成为体现一个国家综合实力的一种标志,被提到一个重要的战略地位.本文主要介绍了发展高性能计算的意义、国内外高性能计算的现状与发展趋势以及福建省对高性能计算的需求,从而提出了政府带动福建省的高性能计算的发展. 相似文献
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In order to investigate the effects of brazing temperature, heating rate and cooling methods on shear strength, hardness, magnetic saturation and coercivity of the ultrafine cemented carbide, the ultrafine cemented carbide was fabricated according to conventional powder metallurgical procedures, and then brazed to the stainless steel with silver-based filler alloy by supersonic frequency induction brazing. The microstructure was observed using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and the magnetic properties were tested utilizing coercimeter and cobalt magnetism instrument. The results show that no micro-crack is found in the cemented carbide after brazing because of silver-based sandwich compound used as filler alloy. In the melted silver layer, there is more carbon in the region adjacent to the cemented carbide. Varied shear strengths, hardnesses, magnetic saturations and coercivities are present under different brazing temperatures, heating rates and coolings. This phenomenon is correlated with some factors such as wettability and fluidity of filler alloy, brazing stress, oxidation of cemented carbide, and allotrope transition of cobalt. Shear strength reaches the maximum of 340 MPa and hardness of ultrafine cemented carbide remains 1879 HV at the brazing temperature of 730℃. The carbon increases with the of increase of the heating rate. What's more, and there is no r/phase found under this condition. content decreases with the increase of brazing temperature, and it the lowest magnetic saturation reaches 81.8% of the theoretic value, 相似文献