http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Genetic Algorithm with Dynamic Variable Number of Individuals and Accuracy
Akihiko Tsukahara,Akinori Kanasugi 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.1
This paper proposes a novel processor for genetic algorithm (GA) that can dynamically change number of individuals and accuracy. In conventional GA, number of population and accuracy are fixed. However, the accuracy of solution is low at first-half stage. Therefore, the number of population is doubled at expense of the accuracy of solution, and the searching ability is improved at first-stage in the proposed GA processor. Then, the number of population is reduced by half, and the accuracy is improved at second-half stage. As a result, the searching ability is improved. The proposed GA processor was designed and verified. The effectiveness of proposed method was confirmed by applying to the knapsack problem.
Transition to/from Turbulence in Subcritical Flows Between two Infinite Parallel Plates
Takahiro Tsukahara 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
In this paper, we present a series of DNSs conducted in two types of plane channel flows, i. e., plane Poiseuille flow and plane Couette flow, considering the subcritical-transition regime with the use of large aspect-ratio computational domains. Both flows give rise to coexisting lamina and turbulent equilibrium regions in the from of oblique stripes, so-called the turbulet stripe. In addition through the long-term tracking of an isolated turbulent spot, we confirmed that spot developed into the turbulent stripes in a channel flow at the transitional Reynolds number. We have also found that, when subjected to stabilizing rotation, the Couette turbulence is locally quenched and exhibits the stripe pattern. In this context, the turbulence stripe can be seen as an intrinsic phenomenon for the transition and the reverse transition in a channel flow.