排序方式: 共有11条查询结果,搜索用时 15 毫秒
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在线性代数中,特征向量在矩阵的对角化过程中起着重要作用.从一个引例出发,证明了:一个矩阵与对角矩阵可交换当且仅当它可以用以特征向量为列向量的两个矩阵表示.做为推论,如果对角矩阵对角线上的相同元素在相邻位置,那么与其可交换的矩阵只能是准对角矩阵. 相似文献
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设计一种新型混合模糊神经推理系统,该系统仅从期望输入输出数据集即可达到获取知识、确定模糊初始规则基的目的.再利用神经网络学习能力便不难修改规则库中的模糊规则以及隶属函数和网络权值等参数,这样大大减少了规则匹配过程,加快了推理速度,从而极大程度地提高了系统的自适应能力.用它对Mackey-Glass混沌时间序列进行预测试验,结果表明利用该网络模型无论离线还是在线学习均能对Mackey-Glass混沌时间序列进行准确的预测,证明了该系统的有效性.
关键词:
神经网络模型
模糊逻辑
混合推理系统
混沌时间序列 相似文献
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应用氨基酸描述子VHSE(Principal component score vector of hydrophobic, steric, and electronic properties)对613个抗原9肽进行结构表征, 在此基础上, 采用支持向量机结合逐步回归变量筛选方法, 成功建立了抗原肽抗原处理相关转运蛋白(Transporter associated with antigen processing, TAP)亲和活性预测模型, 最优线性支持向量机模型的R2, Q2和R2ext分别为0.7386, 0.7270和0.6057. 模型结果分析表明, 影响TAP亲和活性的首要因素是电性, 其次是立体和疏水性质; 底物9肽的P1(N端)及P2, P7和P9(C端)位氨基酸物化性质对TAP亲和活性有重要影响, 而P3, P4, P5和P6位对模型贡献相对较小, P8位则与活性无关. 依据最优模型对模拟点突变9肽的TAP亲和活性的预测结果, 并结合变量载荷分析, 对TAP底物选择特异性进行了分析和总结. 相似文献
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This paper studies the robust fuzzy control for nonlinear chaotic system in the presence of parametric uncertainties. An uncertain Takagi-Sugeno (T-S) fuzzy model is employed for fuzzy modelling of an unknown chaotic system. A sufficient condition formulated in terms of linear matrix inequality (LMI) for the existence of fuzzy controller is obtained. Then the output feedback fuzzy-model-based regulator derived from the LMI solutions can guarantee the stability of the closed-loop overall fuzzy system. The T-S fuzzy model of the chaotic Chen system is developed as an example for illustration. The effectiveness of the proposed controller design methodology is finally demonstrated through computer simulations on the uncertain Chen chaotic system. 相似文献
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A novel adaptive control for uncertain nonlinear chaotic system is presented. A dynamical neural networks is used to perform ‘black box' identification. Based on the identifier, the state feedback control is employed to drive the unknown chaotic system toward the desired target. Simulations show the derived control via the neuro-identifier turns out to be very effective. 相似文献
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The transporter associated with antigen processing (TAP) belongs to the ATP-binding cassette (ABC) transporter superfamily. Driven by ATP hydrolysis, TAP translocates antigenic peptides from the cytosol into the ER (endoplasmic reticulum) lumen where the antigenic peptides are loaded onto the HLA class Ⅰ molecules. Recently, numerous studies show that TAP is closely related with various diseases such as viral infections, autoimmune diseases, and different malignancies. In consideration of important roles of TAP in human adaptive immunity, this review summarizes the recent advances in structure-function relationships of crucial domains and transport mechanism systematically. The challenging problems and potential methods are also pointed out for in-depth researches. 相似文献
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This paper deals with the robust fuzzy control for chaotic systems in the
presence of parametric uncertainties. An uncertain Takagi--Sugeno fuzzy model
for a Lorenz chaotic system is first constructed. Then a robust fuzzy state
feedback control scheme ensures the control for stable operations under
bounded parametric uncertainties. For a chaotic system with known
uncertainty bounds, a robust fuzzy regulator is designed by choosing the
control parameters satisfying the linear matrix inequality. To verify the
validity and effectiveness of the proposed controller design method, an
analysis technique is suggested and applied to the control of an uncertain
Lorenz chaotic system. 相似文献
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