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Multi-response optimization of Ti-6A1-4V turning operations using Taguchi-based grey relational analysis coupled with kernel principal component analysis
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作者 Ning Li Yong-Jie Chen Dong-Dong Kong 《Advances in Manufacturing》 SCIE CAS CSCD 2019年第2期142-154,共13页
Ti-6A1-4V has a wide range of applications, especially in the aerospace field;however, it is a difficultto- cut material. In order to achieve sustainable machining of Ti?6A1-4V, multiple objectives considering not onl... Ti-6A1-4V has a wide range of applications, especially in the aerospace field;however, it is a difficultto- cut material. In order to achieve sustainable machining of Ti?6A1-4V, multiple objectives considering not only economic and technical requirements but also the environmental requirement need to be optimized simultaneously. In this work, the optimization design of process parameters such as type of inserts, feed rate, and depth of cut for Ti-6A1-4V turning under dry condition was investigated experimentally. The major performance indexes chosen to evaluate this sustainable process were radial thrust, cutting power, and coefficient of friction at the toolchip interface. Considering the nonlinearity between the various objectives, grey relational analysis (GRA) was first performed to transform these indexes into the corresponding grey relational coefficients, and then kernel principal component analysis (KPCA) was applied to extract the kernel principal components and determine the corresponding weights which showed their relative importance. Eventually, kernel grey relational grade (KGRG) was proposed as the optimization criterion to identify the optimal combination of process parameters. The results of the range analysis show that the depth of cut has the most significant effect, followed by the feed rate and type of inserts. Confirmation tests clearly show that the modified method combining GRA with KPCA outperforms the traditional GRA method with equal weights and the hybrid method based on GRA and PCA. 展开更多
关键词 TI-6A1-4V Taguchi method Grey relational analysis (GRA) Kernel principal component analysis (KPCA) Multi-response OPTIMIZATION
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Evaluation of Quantum Chemical Methods and Basis Sets Applied in the Molecular Modeling of Artemisinin
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作者 Cleydson B. R. dos Santos Cleison C. Lobato +5 位作者 Josinete B. Vieira Davi S. B. Brasil Alaan U. Brito Williams J. C. Macêdo José Carlos T. Carvalho José C. Pinheiro 《Computational Molecular Bioscience》 2013年第3期66-79,共14页
In this paper, we evaluate semiempirical methods (AM1, PM3, and ZINDO), HF and DFT (B3LYP) in different basis sets to determine which method best describes the sign and magnitude of the geometrical parameters of artem... In this paper, we evaluate semiempirical methods (AM1, PM3, and ZINDO), HF and DFT (B3LYP) in different basis sets to determine which method best describes the sign and magnitude of the geometrical parameters of artemisinin in the region of the endoperoxide ring compared to crystallographic data. We also classify these methods using statistical analysis. The results of PCA were based on three main components, explaining 98.0539% of the total variance, for the geometrical parameters C3O13, O1O2C3, O13C12C12a, and O2C3O13C12. The DFT method (B3LYP) corresponded well with the experimental data in the hierarchical cluster analysis (HCA). The experimental and theoretical angles were analyzed by simple linear regression, and statistical parameters (correlation coefficients, significance, and predictability) were evaluated to determine the accuracy of the calculations. The statistical analysis exhibited a good correlation and high predictive power for the DFT (B3LYP) method in the 6-31G** basis set. 展开更多
关键词 ARTEMISININ MOLECULAR Modeling QUANTUM CHEMICAL methods STATISTICAL analysis B3LYP/6-31G**
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浅析竞争性假设分析法在边防情报分析中的应用 被引量:4
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作者 辛永涛 《云南警官学院学报》 2008年第2期91-94,共4页
竞争性假设分析法(ACH)的合理运用和推广可以有效解决边防情报分析人员思维定势和认知偏见的问题,并能提高其工作效率。边防情报分析人员的期望制约知觉,其思维定势影响新信息的感知,要解决这些问题,使用ACH六步骤分析法是有效的辅助工... 竞争性假设分析法(ACH)的合理运用和推广可以有效解决边防情报分析人员思维定势和认知偏见的问题,并能提高其工作效率。边防情报分析人员的期望制约知觉,其思维定势影响新信息的感知,要解决这些问题,使用ACH六步骤分析法是有效的辅助工具,但要注意ACH的矩阵图不能直接说明结论等问题。 展开更多
关键词 竞争性假设分析法 边防情报分析 思维 应用 六步骤
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