一重循环结构的分类及其循环不变性质的讨论

分析了一般一重循环结构的组成要素，按组成要素给出了一重循环结构的初步分类及其程序函数，并且利用不变式状态定理讨论了 样分类下的循环不变式。     

植物叶片SOD活性分析及植物抗性等级的划分

本文分析了５０种绿化植物的ＳＯＤ活性，并以叶片ＳＯＤ活性为指标，依（Ｘ±ＳＷ）统计原理划分植物抗性等级．比较不同类型植物的ＳＯＤ含量，证实灌木的ＳＯＤ活性高于乔木；阔叶树高于针叶树；幼叶高于成叶。     

甘肃省黄芩属植物的分类与分布

经调查鉴定,本文整理出甘肃省黄芩属植物10种、2变种,其中发现本省分布新记录3种;列出了分种检索表;记载了每个种在本省的产地和分布;为开发利用黄芩属植物资源提供了科学依据。     

Incremental training for SVM-based classification with keyword adjusting

This paper analyzed the theory of incremental learning of SVM (support vector machinc) and pointed out it is a shortage that the support vector optimization is only considered in present research of SVM incremental learning. According to the significance of keyword in training, a new incremental training method considering keyword adjusting was proposed, which eliminates the differcnce hetween incremental learning and batch learning through the keyword adjusling. The experimental results show that the improved method outperforms the method without the keyword adjusting and achieve the same precision as the hatch method.     

"分类组合"教学法在高校女生健美操教学中的效应

针对高校体育课和女学生的特点运用有关原理,设计了"分类组合"教学法.通过对女生健美操的教学实验,统计结果显示实验组在考试成绩以及优秀、良好等级与对照组比较,均存在显著性差异(P<0.05).     

Cytomegalovirus infection blocks apoptosis in cancer cells

Recent pathological findings reveal a higher frequency of human cytomegalovirus (HCMV) in tumor cells from different tumors compared with surrounding tissues. Experimental investigations suggest possible supportive effects of HCMV for tumor development and progression. One HCMV effect on tumor cells is the inhibition of apoptosis, leading to the promotion of tumor cell survival. Decreased sensitivity to treatment-induced tumor cell death is a major reason for failure of anticancer chemotherapy. HCMV infection interferes with both the intrinsic and extrinsic cellular apoptosis pathways. HCMV promotes cell survival signaling influencing the tumor suppressor p53 and its relative p73, and stimulates the antiapoptotic Ras/Raf/MEK/Erk- and PI-3K-signaling pathways. Antiapoptotic effects mediated by HCMV are inhibited by antiviral treatment in cell culture. Therefore, a better understanding of the influence of HCMV infection on tumor cell apoptosis might translate into improved anti-cancer therapy.Received 10 November 2003; received after revision 22 December 2003; accepted 14 January 2004     

Sequential proteome alterations during genesis and progression of colon cancer

Changes in the proteome of colon mucosal cells accompany the transition from normal mucosa via adenoma and invasive cancer to metastatic disease. Samples from 15 patients with sporadic sigmoid cancers were analyzed. Proteins were separated by two-dimensional gel electrophoresis. Relative differences in expression levels between normal tissue, adenoma, carcinoma and metastasis were evaluated in both intra- and inter-patient comparisons. Up- and down-regulated proteins (<twofold) during development to cancer or metastasis were excised and submitted to peptide mass fingerprinting and MS/MS sequence analysis, facilitated by the use of a compact disc workstation. In total, 112 protein spots were found to be differentially regulated, of which 72 were determined as to protein identity, 46 being up-regulated toward the progression of cancer, and 26 down-regulated. Several of the identifications correlate with proteins of the cell cycle, cytoskeleton or metabolic pathways. The pattern changes now identified have the potential for design of marker panels for assistance in diagnostics and therapeutic strategies in colorectal cancer.Received 2 February 2004; received after revision 16 March 2004; accepted 18 March 2004     

元学习策略及性能评价

为提高分类系统的性能,提出一种统一多种元学习算法的元学习框架,定义并描述了并行和串行两种组合方式.由基分类器的分类结果构成新属性,并加入到特征向量中以形成元数据.通过扩展特征向量,元学习增强了对假设空间的表达能力,降低了系统的偏差.在加州大学提供的标准数据集上对元学习策略进行了实验研究,结果表明:与多数投票、最大规则、最小规则等融合方法实现的多分类器系统相比,并行和串行组合在所用数据集上的平均分类错误率可分别降低39.12%和40.56%,且在n分交叉验证中n值的增加并不能改进分类性能,串行组合中的基分类器的顺序对分类错误率没有显著影响.     

论遥感数字图像的模糊分类处理

重点讨论国外遥感数字图像分类处理研究中应用效果显著或应用前景广阔的一些模糊数学方法，并就模糊数学实际应用于遥感图像分类处理的原则性问题提出了一些见解，还就上述诸方法存在的问题提出了一些改进设想．