基于ATmega128的连续信号压缩感知实现方法

为了解决硬件对高频模拟信号采集困难的问题，根据连续信号可以在特定的频域有稀疏的特性，在采样节点，根据伯努利观测矩阵分布特点设计采样间隔，利用压缩采样方法采集数据，降低收发芯片CC1000所需发送的数据量，从而降低传感器节点在通信传输时所损耗的能量，延长节点的使用时间；在汇聚节点使用压缩采样匹配追踪算法(Compressive Sampling Matching Pursuit, CoSaMP)对接收到的稀疏数据进行重构，将重构的数据通过串口助手导出到终端，使用Matlab软件绘图分析，验证压缩感知实现方法的可行性。实验结果表明：该方法能够很好的在ATmega128芯片上实现压缩观测。在压缩率达到68%时，通过分析计算原始信号波形和重构信号波形，二者具有99.30%的相似度，显然将压缩感知理论可应用到局域网中，能减少网络传输的数据量，降低网络传输的能耗。     

基于协方差准则迭代估计的雷达回波压缩重构

在雷达技术领域得到高度关注的压缩感知理论,能够有效地降低高分辨率雷达成像系统的数据率,解决雷达系统中超大数据量的采集、存储与传输问题.宽带雷达回波在信号的幅度-延时基上具有稀疏表示.基于这一特性,可以使用压缩感知理论通过降维采样大大减少数据量.针对降维采样后信号重建问题,文中研究了一种基于协方差准则循环迭代的稀疏参数估计方法(SPICE).文中首先根据雷达回波信号的特征构造了波形延时稀疏字典,再通过随机采样对数据进行压缩,最后将SPICE作为信号重构算法引入雷达回波压缩感知处理过程中.仿真结果表明利用SPICE参数估计方法,可使得压缩率降到很小的程度,且降低重建信号相对原始信号的误差.此外,SPICE算法本身具有数据自适应特性,不需要再根据信号特征选取循环结束条件.仿真结果表明,算法具有较快的收敛速度,能够在较短的时间内准确估计出雷达回波的稀疏参数.     

参与式感知系统中基于压缩感知的数据采集算法

基于压缩感知理论提出了一种在参与式感知系统中进行数据采集的算法.该算法通过对节点社会关系的分析,估计得出部分未被传输的节点感知数据,在此基础上对观测矩阵进行更新,使压缩感知算法可以利用已传输的数据和估计得出的数据进行重构.该算法能显著减少参与式感知系统中传输的数据量,同时能够保证较好的数据重构精度.采用随机漫步移动模型进行了仿真实验,验证了算法的可行性.实验表明,与传统的压缩感知算法相比,上述算法在重构成功率相同的情况下,可以显著减少网络传输的数据量,从而降低网络消耗.     

一种忆阻扫描触发器设计

基于惠普公司的忆阻器模型,提出一种可支持断电模式的选择扫描触发器电路.数据可以从主从触发器中被传输存储到忆阻器中,在触发器被断电期间,忆阻器一直保持该数据.当扫描触发器处于唤醒时刻,忆阻器所保持的数据可以被控制回传到主从触发器中.采用惠普公司提供的忆阻器模拟电路仿真模型进行仿真验证,仿真数据及波形表明,该电路可以满足集成电路的低功耗扫描测试需求.     

心电图数据的组合式增量调制压缩方法

心电图(electrocardiogram，ECG)的波形曲线是一种单值连续时间函数．针对心电波形变化的特点，在分析增量调制压缩方法和自适应增量调制压缩方法的基础上，提出了一种心电图数据组合式增量调制压缩方法．这种压缩方法的压缩效率为1．8左右，实现了心电数据无损性和传输快捷性的统一．     

油气管道电磁超声检测器数据压缩算法研究

电磁超声是管道裂纹检测的有效手段,由于原始波形的数据量很大,而检测器存储设备的容量和存储速度相对有限,有必要研究检测数据在线压缩算法。文中分析了管道检测的特殊环境及其对数据压缩的要求,针对检测器系统的特点及检测数据的特征,提出了分段自适应压缩算法。该算法能够根据信号的幅值变化实时改变压缩比,并且可以通过改变压缩阈值的方法来调整压缩的精度。实验结果显示:该算法应用在电磁超声导波波形数据上,有着较为理想的波形保真度,同时达到了较高的压缩比。对算法优缺点的分析和对压缩质量的评估结果表明:分段自适应压缩算法在压缩效率,压缩质量和算法复杂度等多方面均满足管道电磁超声检测大量数据压缩的要求。     

一种应用于电子地图道路特征点提取的新方法

电子地图中的道路信息数据往往数据量比较大,在进行地图匹配时,不利于对电子地图的快速搜索,因此需要对道路数据进行压缩,提取道路特征点。为此在对现有的道路特征点提取方法进行分析的基础上,提出了一种基于无限圆逼近曲线的自适应道路特征点提取方法。该算法依据道路的曲率变化,按照自适应步长对道路数据进行压缩。仿真实验结果表明,该算法计算量小、逼真度高,有效地提高了电子地图道路数据压缩效率。     

基于 POD 有限元法的粘滞声波方程震源波场重构

叠前逆时偏移是地震勘探中一种流行的地下结构成像方法. 其成像条件需要同时刻的震源波场值与检波器波场值. 这在实际计算中就需要把正演模拟的所有时刻的震源波场数据全部存储下来，存储量需求大. 虽然震源波场重构技术可以降低对于波场数据的存储需求，但会引入额外的计算复杂度. 为解决这个问题，本文提出了POD有限元法，并将其应用于粘滞震源波场重构. 这里的本征正交分解方法( Proper Orthogonal Decomposition, POD)方法是一种降维方法，能够在降低数据量的同时提供足够的计算精度. 数值算例显示，该方法比传统的有限元方法更节省存储空间，能够加快重构速度.     

基于压缩感知的塔康方位估计算法

塔康(tactical air navigation,TACAN)信号峰值检测后的离散数据呈随机采样特性,为避免Kalman算法产生滤波发散问题并有效减小对数据量的需求,提出一种基于压缩感知理论的方位估计方法.通过对塔康信号的角度空间进行稀疏分解和观测值压缩,优化重构原始包络信号进而获得方位估计值.仿真实验证明了该算法的性能,与最小二乘拟合算法相比,在保证估计精度的同时进一步降低了峰值数据量,大大减少了计算过程中的冗余,并且在信噪比较大的情况下,方位估计准确度较最小二乘拟合有一定提高.     

基于JPEG图像格式的数字版权信息隐藏方法研究

本文在对JPEG图像的文件格式进行研究的基础上,提出了一种基于图像格式的数字版权信息隐藏方法,将版权信息嵌入到JPEG图像的应用数据段和压缩数据之后,该方法能嵌入的数据量在理论上不受限制,可以为数字版权信息隐藏提供很好的应用.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.