基于图像序列区域混沌特征的海面舰船目标检测算法

为了检测复杂海面背景中的舰船目标,提出了一种基于图像序列区域混沌特征的目标检测新算法,算法利用小数据量法计算图像序列区域的最大Lyapunov指数,分析运动目标存在时背景信号混沌特征的变化,并利用混沌特征的变化差别检测淹没在混沌背景信号中的目标信号,最后对100帧图像进行了目标检测.计算结果表明:新算法检测率为100%,虚警率为5%,检测结果优于利用统计分析方法的结果.     

SMO算法在邮件过滤中的应用

针对传统的支持向量机(SVM)算法在速度方面的缺陷,本文提出将序列最小优化(SMO)算法引人到垃圾邮件过滤系统中,实验结果证明,该模型训练时间快,过滤效果好.     

Genotypic diagnosis of long QT syndrome by analysis of candidate genes

Objective To diagnose 6 LQTS families by genetic analysis. Methods A total aof 6 LQTS pedigrees with 43 family members were brought together for genetic diagnosis by using short-sequence tandem-repeat (SIR) markers or sequencing. Genomic DNA was extracted from blood samples by standard procedure. STR markers or KCNQ1, KCNH2 and SCN5A were amplified. The haplotype analysis for LQTS was performed. If the family got the negative haplotype analysis, the sequencing was performed. Results LQTS patients were always linkaged with the SCNSA gene in family 1. KCNH2 was linkaged with the disease in family 2 to 5.21 gene carriers were identified from these 5 families. A mutation (A561V-KCNH2) was only found in the proband of family 6 and an SNP (G1691A) was found in all the members of the family. Conclusion Genetic diagnosis can not only improve presymptomatic diagnosis,bnt also provide the basis for personal therapy and research on disease-causing mutations.     

Construction of expression vector for NT4-ADNF-9 fusion gene

Objective To construct the prokaryotic expression vector bearing fusion gene NT4-ADNF-9 and lay foundation for further study on genetic therapy of neuraseusory deafness. Methods By means of asymmetrical prince/ template, double stranded eDNA of activity dependent neurotrophic factor-9 (ADNF-9) was obtained, which included restriction enzymes sites on the two extremities. ADNF-9 eDNA was ligated to the signal and leader peptides of nenrotrophin 4 (NT4), and the fusion gene was named NT4-ADNF-9. Then it was suheluned into prokaryotic expression vector pBV220, and called pBV220/ NT4-ADNF-9. Results Evidences of DNA sequence analysis and restrtction enzymes digestion showed that we recombined ADNF-9 eDNA to the 3'terminal of the signal and leader peptides of NT4, and the fusion gene was subcluned into pBV220 successfully. Bioactivity of the products was proved that it could support the cell survival and neurite growth in the primary cultures of dorsal root ganglia (DRG) of embryonic day-8 cbicken neurons as compared to the control. Conclusion Prokaryotic expression vector pBV220/NT4-ADNF-9 can be constructed successfully and the bioactivtty is satisfactory.     

On Diophantine Equation X（ X ＋ 1 ） （ X ＋ 2） （ X ＋ 3） = 14Y（Y＋1）（Y＋2）（Y＋3）

The Diophantine equation X(X+1)(X+2)(X+3)=14Y(Y+1)(Y+2)(Y+3) still remains open.Using recurrence sequence,Maple software,Pell equation and quadraric residue,this paper proved it has only two positive integer solutions,i.e.,(X,Y)=(5,2),(7,3).     

基于ARIMA模型的外汇汇率时间序列预测研究

利用数据挖掘技术分析外汇汇率时间序列,从时间序列中获得正确的、隐含的、潜在的信息对于金融领域研究具有重要的现实意义。通过数据挖掘中的ARIMA模型,以某银行的外汇汇率时间序列为研究对象,采用差分方法和建模规则,对外汇的卖出价进行了建模与预测。通过与逐步自回归预测模型相比较,ARIMA模型对外汇汇率时间序列数据具有很强的预测能力。     

时间序列AR模型的正则化及其应用

基于正则化理论,通过添加一个正则化因子,构造了一个正则化时间序列模型.算例分析表明,新的正则化时间序列分析模型可改善时间序列分析模型中信息矩阵的病态程度,避免时间序列分析模型产生的不适定性,在一定程度上起到了稳定所求参数的作用.     

米曲霉菌AFLR基因启动子序列的克隆

目的 从米曲霉菌中克隆ＡＦＬＲ基因启动子序列,为进一步开展有关研究以深入阐明曲霉菌产生黄曲霉毒素的机制打下基础。方法 应用分子生物学手段从基因文库中克隆目的基因,对克隆基因进行了限制性酶谱分析,再对启动子序列进行亚克隆并进行了序列测定。结果 从米曲霉菌ＡＴＣＣ １４８９５基因文库中克隆获得含ＡＦＬＲ基因的８．３ｋｂ ＤＮＡ片段。对该基因片段进行了限制性酶谱分析并绘制了限制性酶切图谱。根据酶谱分析结     

特大断面TBM拆卸洞室钻劈法施工关键技术

由于隧道断面大,支护结构在开挖过程中承受的围岩压力较大,为确保隧道施工的安全,四川都四山地轨道交通项目紫荆隧道特大TBM拆卸洞室采用钻劈法开挖。介绍了液压劈裂技术的工作原理、工作参数的确定,拆卸洞开挖支护关键技术。实践证明：在Ⅲ级及以上围岩的硬质岩中采用潜孔钻施作周边眼+掌子面劈裂相结合的形式开挖效果显著,安全、环保、可控性强。液压劈裂技术在不能进行爆破施工的隧道中具有广阔的推广前景。     

改进小波包与长短时记忆组合模型的短时交通流预测

为克服非稳定交通流状态下短时交通流预测精度不高、过分依赖大样本历史数据的缺陷,提出一种改进小波包分析和长短时记忆神经网络组合(IWPA-LSTM)的短时交通流预测方法. 利用功率谱细化的思想改进小波包分析算法对小样本交通流时间序列进行多尺度分解和单支重构. 对低频序列和高频序列进行相空间重构,完成长短时记忆模型的逐层构建,实现本地保存并根据预测精度进行自适应更新,将重构的子序列输入模型训练和预测. 将各子序列的预测值叠加输出IWPA-LSTM最终预测值. 实验结果表明,提出的IWPA-LSTM模型在小样本情况下的预测精度优于经典深度学习模型,具有较强的实用性.