稀疏

The method includes the following steps: firstly, a spherical neighborhood of present sample points is established by using the geometric spherical-modelling theory and all the sample points contained in the spherical neighborhood are adopted as candidate neighbor points, thus not only preserving the effectivity of the dimension reduction capability when data sets are sparse but also getting the advantages of low-sensitivity to isolated points and good stability of the preserved topological structure; then a data relevance matrix more matching semantics can be obtained by relevance measurement based on route clusters to update the candidate neighbor points in the spherical neighborhood and optimize the regular neighborhood space of the present sample points, thus improving the phenomenon that the dimension reduction of sample sets provided with folded curved faces is apt to suffer the integrated-structure distortion in case of heterogeneous data distribution.

首先利用几何开球原理建立当前样本点的球状邻域，将包含在球状邻域内的所有样本点作为候选近邻点，不但能够保持在数据集稀疏情况下的降维性能的有效性，而且具有对孤立点敏感性不高、保留拓扑结构稳定性好的优点。然后利用基于路径聚类的相关性度量得到更符合语义的数据相关性矩阵，用来对球状邻域内的候选近邻点进行更新，优化当前样本点的规则邻域空间，改善了当数据不均匀分布时在带有折叠弯曲面的样本集上降维容易出现整体结构扭曲的现象。

The measurement system error model analysis is introduced into power system real time network state analysis as an important part for the first time, which can improve on the state estimation quality and provide the capability to monitor the operation of the measurement system; 2. The theory and algorithm of the on-line estimation and update of measurement noise variance based on the relation between the residual variance and noise variance. The statistic properties of the sample variance are discussed and the relation between the estimation precision and sample size under given confidence level is derived; 3. The theory and algorithm of detection and identification of measurement bias are presented, which is based on the relation between residual mean and noise mean. The statistic properties of sample mean are discussed and the relation between estimation precision and sample size is derived; 4. The Givens orthogonal transformation algorithm is selected to be the essential algorithm of state estimation, the fast orthogonal transformation algorithm with damp factor and the algorithm which can handle the zero injection measurements efficiently are presented; 5. The quantity analysis theory of bad data detectivity and identifibility are presented, which describes the relation between the elements in matrix W〓 and bad data amplitude and can provide the theory base for measurement system design and valuation.

一、首次将量测系统误差模型分析做为一个环节引入电力系统实时网络状态分析中，为EMS系统增加了实时监视系统运行、修正量测系统误差模型的新功能，进一步发挥了实时网络状态分析应用软件的潜力；二、首次提出了应用样本方差在线估计与修正量测系统误差方差的基本理论，讨论了样本方差的统计性质和概率分布，推导出了样本容量、估计精度和置信度之间的关系，给出了在线估计与修正量测系统误差方差的算法；三、首次提出了应用样本均值在线检测与辨识量测偏差的基本理论，讨论了样本均值的统计性质，推导了样本容量、估计精度和置信度之间的基本关系，给出了在线检测与辨识量测偏差的算法；四、在状态估计算法设计中，以Givens变换算法做为基本算法，提出了快速正交变换阻尼因子法和可以有效地处理零注入量测的混合法，并对实时应用中的一些问题进行了讨论；五、提出了不良数据可检测性与可辨识性的定量分析理论，揭示了描述量测系统配置、网络结构与参数的残差灵敏度矩阵中的元素与不良数据的幅值在可检测、可辨识能力上的定量关系，为量测系统配置设计与评价提供了理论基础；六、综合国内外最新研究成果，采用自适应自回归预测技术和稀疏矢量技术，构造了较完善的不良数据检测与辨识算法。

At 68,("20 Celsius" he insists), his hair has thinned, his middle has thickened, and the basso voice has grown rheumy.

他68岁（他坚持自己只有20摄氏度），头发稀疏，腰围已宽，男低音的嗓子变的粘粘糊糊了。

A rounding error analysis of the symplectic Lanczos method is given for the Hamiltonian eigenvalue problem.

给出了求解大规模、稀疏Hamilton矩阵特征问题的辛Lanczos算法的舍入误差分析。

The area west of the Mangos was a barren waste, while in the east, where sand dunes rippled, desert plants like sandwort and wormwood grew sparsely.

莽古斯沙漠往西的纵深地区，是寸草不长的死漠，靠近东侧的凸凹连绵的坨包区，还长有些稀疏的沙蓬、苦艾、白蒿子等沙漠植物。

The experimental result shows that compared to principle component analysis, the classification result of SCA is more reliable and more accurate.

实验结果表明，与主成分分析方法相比，基于稀疏成分分析的分类结果更可靠、更准确。

A thousand times over in that half-hour, with intent, strained, and uneasy eyes Rostov scanned the thickets at the edge of the copse with two scraggy oaks standing up above the undergrowth of aspen, and the ravine with its overhanging bank, and "uncle's" cap peering out from behind a bush on the right.

就在这半个钟头以内，罗斯托夫用那紧张而不安的、逼视的目光千次地打量森林的边缘，一些别种幼树夹杂在山杨树中间，上面耸立着两颗稀疏的橡树，他还注视着被雨水冲掉边缘的沟壑以及右面那座灌木林后依稀可辨的大叔的皮帽。

The matt or web of fibers may be fed into the punching area on a substrate of filament s, a scrim, or some other substrate, the substrate also may be placed in the middle of the fiber web.

纤维网可在长丝衬、稀疏平布或其它衬料的托持下进入针刺区。衬料也可置于纤维网的中间

The matt or web of fibers may be fed into the punching area on a substrate of filaments, a scrim, or some other substrate, the substrate also may be placed in the middle of the fiber web.

纤维网可在长丝衬、稀疏平布或其它衬料的托持下进入针刺区。

Stem leaves few; petiole 4--6 cm; leaf blade linear-oblong, 5--7 X 2--3.5 cm, abaxially sparsely white scurfy, adaxially sparsely puberulent, pinnatipartite; segments 7--12 pairs, oblong-ovate to triangular-lanceolate, sinuate-dentate.

茎生叶很少；叶柄4-6厘米；叶片线形长圆形，5-7 X白色具鳞屑的2-3.5厘米，背面稀疏，疏生微柔毛，羽状深裂；裂片7-12 对，长圆状卵形披针形到三角形，具深波状具牙齿。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。