水环境污染状况评价变量加权主成分分析方法

在合理选择数据规格化方法基础上,建立水污染状况评价的变量加权主成分分析方法,并以判别分析方法就水质污染级别进行校验,实证分析结果表明:改进后的主成分分析方法和评价体系较已有方法效果有显著提高。     

区域经济发展智能预测方法

分析了影响区域经济发展的各种因素,指出由于这些因素相互制约、相互影响,使得传统的经济预测方法越来越难以胜任区域经济发展预测的需要.论述了核方法在处理非线性、不确定性和不精确性数据上存在的优势,建立了基于核方法三种经济预测模型,并将这三种预测模型与其它两种预测方法一起,对区域经济的发展进行组合预测.最后,采用数据融合的方法将各个体模型的预测结果进行集成,作为最终的输出.实际的结果表明,基于核方法的组合预测技术能取得较为理想的预测效果.     

折反系统的光心及其性质

根据等效光学系统理论，讨论折反系统心及其性质。     

一种离散型随机变量的分布

讨论一种离散型随机变量的分布,得到了此种随机变量的概率分布以及该分布的数学期望与方差,并验证了该分布应满足的必要条件.     

Integration of genetic virtual screening patterns and latent multivariate modeling techniques for QSAR optimization based on combinations and/or interactions between peptides and proteins

Both the concept and the model of snug quantitative structure-activity relationship (QSAR) were pro-posed and developed for molecular design through constructing QSAR based on some known mode of receptor/ligand interactions. Many disadvantages of traditional models can be avoided by using the proposed method because the traditional models only determined upon molecular structural features in sample sets themselves. A genetic virtual screening of peptide/protein combinations (GVSPPC) is proposed for the first time by utilizing this idea to examine peptide/protein affinity activities. A genetic algorithm (GA) was developed for screening combinative targets with an interaction mode for virtual receptors. GVSPPC succeeds in disposing difficulties in rational QSAR,in order to search for the ligand/receptor interactions on conditions of unknown structures. Some bioactive oligo-/poly-peptide systems covering 58 angiotensin converting enzyme (ACE) inhibitors and 18 double site mutation residues in camel antibody protein cAb-Lys3 were investigated by GVSPPC with satisfactory results (R 2 cu>0.91,Q 2 cv > 0.86,ERMS=0.19-0.95),respectively,which demonstrates that GVSPPC is more inter-pretable in the ligand-receptor interaction than the traditional QSAR method.     

基于向量夹角余弦的加权调和平均组合预测模型的有效性

加权调和平均组合预测为一种非线性的组合预测方法.提出了基于向量夹角余弦的加权调和平均组合预测模型,针对该模型定义了优性组合预测、预测方法优超和组合预测冗余度等新的概念;探讨了非劣性组合预测和优性组合预测存在的充分条件;给出了一个冗余预测方法出现的判定定理.     

Rapidity dependence of hadron PT spectra in central Au+Au collisions at = 200 GeV

The transverse momentum spectra for identified hadrons at different rapidities in central Au+Au collisions at = 200 GeV are studied in a quark combination model. The results for PT spectra of π±,K±, p(p-) and for the p/π ratios in a broader PT range at midrapidity agree well with the data. The transverse momentum spectra of pions, protons and antiprotons at various rapidities y 1, η= 2.2 and y≈3.2 are calculated and compared with the data.     

Calculation of Mass and Abundance for Polyisotopic Ion by Low Resolution Mass Spectrometry

The new algorithm calculated mass and abundance for polyisotopic ion by low‐resolution mass spectrometry was developed based on probability theory. The results of mass and abundance data of polyisotopic ion calculated by the algorithm were coincided with the experimental values. By comparison with the Kubinyi's method, our algorithm is simpler and easier to master for operator.     

基于Theil不等系数的加权几何平均组合预测模型的性质

加权几何平均组合预测为一种非线性的组合预测方法。本文提出了基于Theil不等系数的加权几何平均的组合预测模型,针对该模型定义了优性组合预测、预测方法优超和组合预测冗余度等新的概念;探讨了非劣性组合预测和优性组合预测存在的充分条件;给出了一个冗余预测方法出现的判定定理。     

期货套期保值C VaR风险的敏感度分析

把条件风险价值应用于期货组合套期保值的风险管理,分析条件风险价值对期货部位的敏感性.在一般的概率分布下,分空头套期保值和多头套期保值两种情况,导出期货组合套期保值的条件风险价值关于套期比的一阶和二阶变化率,并研究其经济意义.投资者可以根据条件风险价值的敏感度增减期货头寸,把握好用于套期保值的期货量,帮助投资者管理套期保值风险.