众创空间投入与区域科技创新发展关系实证研究

以众创空间投入及其所在区域科技创新发展状况为对象,以科技进步贡献率为衡量科技创新能力指标,基于线性回归方法和向量自回归模型分析西安市众创空间投入的创新效果及其与西安市科技进步贡献率之间的关系。研究结果表明:加大众创空间投入可以更好地提升众创空间孵化效率,产生良好的创新效果,且该创新效果与科技创新发展之间存在长期正相关关系;科技进步对众创空间创新效果指标的预测方差贡献较大,众创空间对科技发展的预测方差贡献较小。建议采用合理的融资模式与政策组合鼓励建设众创空间,并使用科学合理的运营模式提升众创空间盈利能力,以期获得众创空间良好的创新效益及社会效益。     

改进潜在语义索引的个性化搜索引擎的设计

个性化搜索引擎是一种通过机器主动学习用户兴趣,并根据用户兴趣帮助用户进行信息筛选的新一代智能化搜索引擎,潜在语义索引模型在词与词、文本与文本之间的检索中具有先进性．针对该模型中文档集用户兴趣有效性低的问题引入用户个性词典来改进,给出一个完整的可学习用户兴趣并可动态调整的个性化搜索引擎的设计．实验表明潜在语义索引比向量空间模型具有更好的信息检索性能,同时改进的潜在语义索引算法与传统算法相比在文献检索方面性能有明显提高．     

“中庸”的智慧深度——《中庸》和中庸研究的新动向

作为一部真正的中国经典,《中庸》记录和传达的是一种最为深邃的中国智慧,宋儒和当代新儒家对《中庸》中的"中庸"智慧都曾有过深刻的揭示。近些年来,《中庸》重新唤起了学者们的热情关注,出版了一些颇具分量的研究成果。其中的三部书——杜维明的《〈中庸〉洞见》、陈赟的《中庸的思想》和伍晓明的《"天命:之谓性!"——片读中庸》,展示了中国经典研究的最新成果,揭示了《中庸》和"中庸"智慧的现代意义。     

Towards skin polarization characterization using polarimetric technique

Measurement of optical properties of skin is an expanding and growing field of research. Recent studies have shown that the biological tissue, especially skin, changes the polarization state of the incident light. Using this property will enable the study of abnormalities and diseases that alter not only the light intensity but also its polarization state. In this paper we report an experimental study for measuring changes of polarization state of the light scattered from a phantom similar to a sample model of scattering skin. Using the notation of Stokes vector for the polarized light and Mueller matrix for the sample with its polarization properties, we have shown that some elements of the matrix were particularly sensitive to the changes of the polarization-altering physical properties of the scatterers within the phantom.      

Nonlinear multifunctional sensor signal reconstruction based on least squares support vector machines and total least squares algorithm

Least squares support vector machines （LS-SVMs） are modified support vector machines （SVMs） that involve equality constraints and work with a least squares cost function, which simplifies the optimization procedure. In this paper, a novel training algorithm based on total least squares （TLS） for an LS-SVM is presented and applied to multifunctional sensor signal reconstruction. For three different nonlinearities of a multifunctional sensor model, the reconstruction accuracies of input signals are 0.00136%, 0.03184% and 0.504 80%, respectively. The experimental results demonstrate the higher reliability and accuracy of the proposed method for multifunctional sensor signal reconstruction than the original LS-SVM training algorithm, and verify the feasibility and stability of the proposed method.     

Outlier detection by means of robust regression estimators for use in engineering science

This study compares the ability of different robust regression estimators to detect and classify outliers. Well-known estimators with high breakdown points were compared using simulated data. Mean success rates （MSR） were computed and used as comparison criteria. The results showed that the least median of squares （LMS） and least trimmed squares （LTS） were the most successful methods for data that included leverage points, masking and swamping effects or critical and concentrated outliers. We recommend using LMS and LTS as diagnostic tools to classify outliers, because they remain robust even when applied to models that are heavily contaminated or that have a complicated structure of outliers.     

《中庸》在儒学中的地位与现代价值

《中庸》一书在儒学中地位重大,并在现代社会中逐渐发挥出巨大的价值,我们要审视思考,发挥其作用。文章从中庸的内在含义来阐述了中庸思想在现代社会中的地位和价值。     

求解二次特征值问题的添加精化向量的直接法

基于残量范数极小的原则,提出了一种在迭代反位移的Arnoldi方法基础上进行改进的新算法,该算法在数值实验方面体现了其优越性.     

Stress reactivity after maximal exercise: The effect of manipulated performance feedback in endurance athletes

This study was designed to assess the effect of performance feedback on stress reactivity after recovery from maximal exercise. Forty competitive athletes were recruited to complete a maximal exercise test. Performance feedback was manipulated after the exercise test to give four groups: (1) high performance, (2) low performance, (3) accurate feedback and (4) no exercise control. Cardiovascular reactivity was assessed during psychological stress. The results indicate that accurate feedback participants experienced lower relative reactivity to stress (lower mean arterial pressure) than their no-exercise counterparts. These results demonstrate that the stressbuffering effect of exercise extends to maximal exercise. In addition, high-performance participants experienced lower relative reactivity than low-performance participants. Thus, low-performance feedback was sufficient to remove the buffering effect of exercise. There were no differences between the high-performance and accurate feedback conditions, or between the low-performance and control conditions.     

一种改进的权均值粒子群优化算法

针对粒子群优化算法的早熟收敛和进化后期收敛速度慢等问题,提出了权均值粒子群优化算法。通过在“认知”部分和“社会”部分加入随机权值更新粒子的飞行速度,使粒子能够很快地收敛到全局最优点。典型函数的仿真结果表明,该算法不仅具有较好的全局收敛性能和较快的收敛速度,而且有效地避免了早熟收敛问题。