基于时间-距离-多普勒像的编队目标架次检测

针对实际编队目标在距离上的分布特性和目标多普勒频率的变化规律,利用联合时频变换代替传统傅立叶变换,建立目标时间-距离-多普勒立体像,提出一种基于立体像的目标架次检测方法。该方法不仅能给出清晰的瞬时距离-多普勒像,而且能反映目标距离-多普勒像的时间演变特性,较好地解决了目标在距离上的分布和多普勒像的模糊。实测回波数据验证了该方法的有效性,成功地实现了4架编队飞机目标的架次检测。     

基于电子商务环境的自动化立体仓库系统研究

随着信息技术的高速发展,电子商务思想日益为企业所接受,越来越多的企业开始尝试其使用,同时也对物流自动化系统的开发提出了更高的要求。以某物资供应中心自动配送系统为例,探讨了基于电子商务环境条件下自动化立体仓库系统的管理控制与作业模式。     

基于蚁群系统的仿真机器人足球攻防转换策略

为了提高机器人足球的整体攻防能力,在动态攻防转换策略中建立了基于蚁群系统的混合通信机制,既增强了足球机器人的协作能力,又避免了足球机器人陷入冲突或任务死锁状态,增加了攻防转换的灵活性。在该通信机制的基础上采用攻防区域划分的方法,以球的位置为驱动信息,通过信息素来确定变换队形。在FIRA仿真平台中实验表明,基于蚁群混合通信机制的动态攻防转换策略使得仿真足球机器人在比赛过程中表现出更优异的性能,改善了球队的整体攻防能力,可有效应用于机器人足球比赛中。     

一种高效挖掘高维数据的频繁闭合模式算法

为了克服传统高维数据挖掘频繁闭合模式算法迭代产生子表,引起算法执行时间长和存储开销大等问题,提出了一种高效挖掘高维数据的频繁闭合模式的算法EMHCP. EMHCP算法采用一种新型结构位图表来压缩存储数据,在仅扫描数据库一次后,建立位图转换表.根据位图转换表来构建混合树结构,采用深度优先的方式和有效的剪枝策略高效挖掘出所有的闭合模式.从而有效地缩小了搜索空间,加快了处理速度.通过在生物数据库应用的实验结果表明, EMHCP算法比已有的CARPENTER和TD-close等算法更为有效.     

An eicosanoid-centric view of atherothrombotic risk factors

Cardiovascular disease is the foremost cause of morbidity and mortality in the Western world. Atherosclerosis followed by thrombosis (atherothrombosis) is the pathological process underlying most myocardial, cerebral, and peripheral vascular events. Atherothrombosis is a complex and heterogeneous inflammatory process that involves interactions between many cell types (including vascular smooth muscle cells, endothelial cells, macrophages, and platelets) and processes (including migration, proliferation, and activation). Despite a wealth of knowledge from many recent studies using knockout mouse and human genetic studies (GWAS and candidate approach) identifying genes and proteins directly involved in these processes, traditional cardiovascular risk factors (hyperlipidemia, hypertension, smoking, diabetes mellitus, sex, and age) remain the most useful predictor of disease. Eicosanoids (20 carbon polyunsaturated fatty acid derivatives of arachidonic acid and other essential fatty acids) are emerging as important regulators of cardiovascular disease processes. Drugs indirectly modulating these signals, including COX-1/COX-2 inhibitors, have proven to play major roles in the atherothrombotic process. However, the complexity of their roles and regulation by opposing eicosanoid signaling, have contributed to the lack of therapies directed at the eicosanoid receptors themselves. This is likely to change, as our understanding of the structure, signaling, and function of the eicosanoid receptors improves. Indeed, a major advance is emerging from the characterization of dysfunctional naturally occurring mutations of the eicosanoid receptors. In light of the proven and continuing importance of risk factors, we have elected to focus on the relationship between eicosanoids and cardiovascular risk factors.     

Frequent mutations of chromatin remodeling genes in transitional cell carcinoma of the bladder

Transitional cell carcinoma (TCC) is the most common type of bladder cancer. Here we sequenced the exomes of nine individuals with TCC and screened all the somatically mutated genes in a prevalence set of 88 additional individuals with TCC with different tumor stages and grades. In our study, we discovered a variety of genes previously unknown to be mutated in TCC. Notably, we identified genetic aberrations of the chromatin remodeling genes (UTX, MLL-MLL3, CREBBP-EP300, NCOR1, ARID1A and CHD6) in 59% of our 97 subjects with TCC. Of these genes, we showed UTX to be altered substantially more frequently in tumors of low stages and grades, highlighting its potential role in the classification and diagnosis of bladder cancer. Our results provide an overview of the genetic basis of TCC and suggest that aberration of chromatin regulation might be a hallmark of bladder cancer.     

Histone deacetylase inhibitors augment doxorubicin-induced DNA damage in cardiomyocytes

Histone deacetylase inhibitors have emerged as a new class of anticancer therapeutics with suberoylanilide hydroxamic acid (Vorinostat) and depsipeptide (Romidepsin) already being approved for clinical use. Numerous studies have identified that histone deacetylase inhibitors will be most effective in the clinic when used in combination with conventional cancer therapies such as ionizing radiation and chemotherapeutic agents. One promising combination, particularly for hematologic malignancies, involves the use of histone deacetylase inhibitors with the anthracycline, doxorubicin. However, we previously identified that trichostatin A can potentiate doxorubicin-induced hypertrophy, the dose-limiting side-effect of the anthracycline, in cardiac myocytes. Here we have the extended the earlier studies and evaluated the effects of combinations of the histone deacetylase inhibitors, trichostatin A, valproic acid and sodium butyrate on doxorubicin-induced DNA double-strand breaks in cardiomyocytes. Using γH2AX as a molecular marker for the DNA lesions, we identified that all of the broad-spectrum histone deacetylase inhibitors tested augment doxorubicin-induced DNA damage. Furthermore, it is evident from the fluorescence photomicrographs of stained nuclei that the histone deacetylase inhibitors also augment doxorubicin-induced hypertrophy. These observations highlight the importance of investigating potential side-effects, in relevant model systems, which may be associated with emerging combination therapies for cancer.     

大型多媒体中央控制系统的原理及应用

多媒体中央控制系统以其强大的信号整合处理功能与对多媒体设备的集中控制管理功能为优势在生产调度中心、军事指挥中心得了广泛应用。本文以多媒体中央控制系统在军事作战指挥中心的实际工程应用为背景,详细描述了多媒体中央控制系统的工作原理以及其在实际工程中的应用。     

基于曲率的自适应曲面数控磨削

利用等包络迹高度控制砂轮行走路径,实现了曲面的自适应数控成型磨削,以提高曲面的磨削效率.首先,根据曲面曲率建立自适应数控成型磨削的数控模式,然后,在比较等间距行走的数控磨削方式的基础上分析曲面曲率不同的成型磨削特征,最后,进行数控成型磨削试验和检测加工曲面的成形误差,验证该自适应数控成型磨削方法的有效性.分析结果表明,利用移动磨削点的包络成型磨削可以减小砂轮磨损对加工精度的影响.此外,等包络迹高度行走的数控磨削可以根据曲面曲率调节行走路经的间距,实现自适应磨削加工,提高曲面的加工效率,而且在加工曲率较大且提高加工精度时可以较大幅度地减少砂轮行走步数.试验结果表明,当等包络迹高度小至1μm时可以形成光顺的加工曲面,在100mm×40mm范围内形状误差PV值可以达到0.285mm.