基于优化和两阶段筛选的时间序列Shapelets提取研究

与基于全局特征的时间序列分类方法相比,基于shapelets的分类方法在可解释性和分类速度方面更具优势。针对现有的优化模型学习到的shapelets判别力不足以及shapelets候选数量太多等问题,提出了基于优化和两阶段筛选的时间序列shapelets提取算法。首先对时间序列取样,结合极值点和序列趋势对取样的时间序列进行分组,根据分组结果对稀疏组Lasso正则器的每项赋予权重,并在加权稀疏组Lasso的每一组中都使用融合罚正则项来保证解的相邻位置平坦变化,将多项稀疏正则项作为正则器与局部线性判别分析相结合来构建目标函数。然后,建立一个两阶段的筛选框架来度量组的稀疏性,从而快速地找到对分类起决定性作用的关键组。最后仅使用一组关键组来提取shapelets用于时间序列的分类,缩小了shapelets的规模。在28个时间序列数据集上进行了大量实验,实验结果表明,与现有的基于shapelets的提取方法相比,所提方法不仅能显著提高分类精度,具有较高的时间效率,而且能够在一定程度上缩小shapelets的规模。

1000kV GIL设备在特高压南阳站扩建工程中的应用

介绍了南阳站气体绝缘输电线路(GIL)工程总体布置方案,给出了工程关键组部件的标准化单元设计,研究了3套不同原理的故障定位系统优缺点。分析了GIL故障时为可靠闭锁对站重合闸,差动保护采用专用远传信号传输装置及通道的方案。基于就近的自平衡伸缩节或铰链伸缩节作为拆解故障单元的起始位置,阐述了不同类型母线气室故障检修方案及设备投运以来柔性设计部件存在的问题,为后续1000kV GIL工程的设备制造、工程设计、运维检修等提供借鉴。

Characteristics of Deposition of Inosine Monophosphate(IMP) and Intramuscular Fat(IMF) in Muscles of Jinghai Yellow Chicken and Its Crossbreeds

[Objective] This study aimed to investigate the characteristics of deposition of inosine monophosphate （IMP） and intramuscular fat （IMF） in muscles of Jinghai yellow chickens and its crossbred.[Method] The characteristics of IMP and IMF deposition of 112-day-old Jinghai yellow chickens （J×J） and its two different 70-day- old crossbreeds （J×B and B×B） were analyzed. The IMP content in breast muscle and leg muscle were determined by HPLC. [Result] The contents of IMP and cor- rected inosine monophosphate （IMPc） in breast muscle were significantly or ex- tremely significantly higher than that in leg muscle of the chickens in the three groups whether in male or female chickens （P〈0.05 or P〈0.01）. There were no sig- nificant difference in the contents of IMP and IMPc between hens and roosters （P〉 0.05）. The fresh degree of breast muscle and leg muscle was 96,11%-98.16% and 87.22%-93.07%, respectively. And the fresh degree of breast muscle was higher than that of leg muscle. In the three groups, the IMF content in leg muscle was significantly higher than that in breast muscle whether in male or female chickens （P〈0.05）. The contents of IMF in breast muscle and leg muscle were 0.36%-0.75% and 1.84%-2.38%, respectively. The iMP content in breast muscle of chickens in Bx J group was extremely significantly higher than that in breast muscle of chickens in JxJ group （P〈0.01）, but the contents of IMPc and iMF of breast muscle and leg muscle of the chickens in the three groups had no significant difference （P〉0.05）. [Conclusion] To sum up, the freshness and flavor significantly differ between the breast muscle and leg muscle of chickens, but show no significant difference among the three groups.

Self-organized Criticality in an Earthquake Model on Random Network

A simplified Olami-Feder-Christensen model on a random network has been studied. We propose a new toppling rule -- when there is an unstable site toppling, the energy of the site is redistributed to its nearest neighbors randomly not averagely. The simulation results indicate that the model displays self-organized criticality when the system is conservative, and the avalanche size probability distribution of the system obeys finite size scaling. When the system is nonconservative, the model does not display scaling behavior. Simulation results of our model with different nearest neighbors q is also compared, which indicates that the spatial topology does not alter the critical behavior of the system.

Critical Success Factors for Executive Information Systems： A Case of Kenyan Organizations

In recent years, a number of organisations have implemented Executive Information Systems （EIS） including Computer-Based Information Systems （CBIS） in order to improve the performance of their executives＇ jobs though the majority of executives are unwilling to use EIS applications because of their design defects. Present researches on Executive Information Systems （EIS） are limited and less focused on the factors associated with EIS successful usage. This research adopts an extension of the Technology Acceptance Model （TAM） to derive useful variables to address the problem of the low usage of EIS by executives due to social factors, habits and facilitation conditions variables in Triandis＇ Framework. It reports on the adoption and usage of EIS by the executives in Organizations. The results show that experience in EIS usage was high with most respondents having used EIS for between 0 to 4 years （72.41%）, followed by the 5-9 years group with 25.86%. However, in terms of ability to use EIS, most executives were at the expert （knowledgeable）, casual user with 37.93%, followed by novice frequent user group with 31.03%. From this research, the authors propose a model that incorporates the habits, social factors and facilitating conditions in an Executive Information Systems.

Purification of γ-Subunits Phosphodiesterase （γ-PDE6） Protein

Phosphodiesterase （PDE） exist various forms for the different structure and property, which is one of key components of light receptors in retinal rod cells. In this paper, cloning the DNA of T-subunits Phosphodiesterase （γ-PDE6） from cDNA library, constructing the corresponding recombinant plasmid, and purification of the protein after initial expression was studied.

An Oryza-specific hydroxycinnamoyl tyramine gene cluster contributes to enhanced disease resistance

Genomic clustering of non-homologous genes for the biosynthesis of plant defensive compounds is an emerging theme, but insights into their formation and physiological function remain limited. Here we report the identification of a newly discovered hydroxycinnamoyl tyramine(HT) gene cluster in rice.This cluster contains a pyridoxamine 50-phosphate oxidase(Os PDX3) producing the cofactor pyridoxal50-phosphate(PLP), a PLP-dependent tyrosine decarboxylase(Os Ty DC1), and two duplicated hydroxycinnamoyl transferases(Os THT1 and Os THT2). These members were combined to represent an enzymological innovation gene cluster. Natural variation analysis showed that the abundance of the toxic tyramine intermediate of the gene cluster among different rice accessions is mainly determined by the coordinated transcription of Os Ty DC1 and Os THT1. Further pathogen incubation assays demonstrated that the end products of the HT gene cluster displayed enhanced resistance to the bacterial pathogen Xanthomonas oryzae pv. Oryzae(Xoo) and fungal pathogen Magnaporthe oryzae(M. oryzae), and the enhanced resistance is associated with the boost of phytoalexins and the activation of defense response. The unique presence of the HT gene cluster in Oryza AA genome, together with the enrichment of transposon elements within this gene cluster region, provides an evolutionary background to accelerate cluster member combinations. Our study not only discovered a gene cluster involved in the phenylpropanoid metabolism but also addressed the key aspects of gene cluster formation. In addition, our results provide a new metabolic pool for plant defense against pathogens.