E读

双语推荐：Stein''s

基于线性回归模型参数向量的先验信息提出一类新的s-K估计——改进s-K估计,并在均方误差阵意义下,得到了这类估计分别优于最小二乘估计、广义岭估计、Stein估计及s-K估计的充要条件.

A new class of s-K estimators,called the modified s-K estimators was proposed based on the prior information for the parameter vector in a linear model. The necessary and sufficient conditions that the new estimators are respectively superior to the least squares estimator,ridge estimators,Stein estimators and s-K estimators were obtained.

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Let(X, d, μ) be a metric measure space endowed with a metric d and a nonnegative Borel doubling measure μ. Let L be a second order non-negative self-adjoint operator on L2(X). Assume that the semigroup e-tLgenerated by L satisfies the Davies-Gaffney estimates. Also, assume that L satisfies Plancherel type estimate. Under these conditions,we show that Stein''s square function Gδ(L) arising from Bochner-Riesz means associated to L is bounded from the Hardy spaces Hp L(X) to Lp(X) for all 0 p ≤ 1.

Let (X, d, μ) be a metric measure space endowed with a metric d and a nonneg-ative Borel doubling measure μ. Let L be a second order non-negative self-adjoint operator on L2(X). Assume that the semigroup e-tL generated by L satisfies the Davies-Gaffney estimates. Also, assume that L satisfies Plancherel type estimate. Under these conditions, we show that Stein’s square function Gδ(L) arising from Bochner-Riesz means associated to L is bounded from the Hardy spaces HpL(X) to Lp(X) for all 0

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估计量的优良性是回归模型中的重要内容.本文讨论了在Pitman准则下,岭估计与Stein压缩估计的优良性,得到了岭估计优于Stein压缩估计的一个充分条件.

The superiority of estimators is an important content in regression model .In this paper,pitman criterion is used to study the superiority of both ridge estimation and James -stein estimation , and then obtain the sufficient conditions under which the ridge estimation outperform James -stein estimation under the pitman criterion .

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针对传统空域非局部平均方法在合成孔径雷达图像相干斑抑制中存在相似区域提取和方向信息捕获不足的问题,提出了一种基于各向异性高斯方向窗和Stein’s无偏风险估计(SURE)准则融合的非局部均值(NLM)算法。该方法设计多个不同方向的各向异性高斯窗来匹配SAR图像的局部空间几何结构,比传统的方形窗能更好地保护SAR图像中的方向性结构。采用比率测度来衡量图像块间的相似程度,并计算基于该各向异性高斯窗的NLM结果。结合SURE准则来融合不同方向的各向异性高斯窗的非局部平均结果,获得最终的SAR图像降斑结果。针对多幅SAR图像进行对比实验,实验结果表明:该方法在有效抑制SAR图像相干斑的同时能很好地保留图像的几何结构信息,为后续的SAR图像理解与解译提供了良好的基础。

Aimed at the shortage of similar region capture and directional information obtainment for SAR image despeckling using conventional non-local means method (NLM), a new NLM SAR image despeckling method is proposed based on multiple different directional anisotropic Gaussian directional window and Stein unbiased risk estimation (SURE) aggregation. The ratio measurement strategy is utilized to compute the similarity of two patches and the NLM result is computed based on the anisotropic Gaussian windows with some direction. The results of NLM with different anisotropic Gaussian windows are aggregated by using the Stein unbiased risk estimation criterion to obtain the final SAR despeckling result. For multiple SAR images, the experiment results show that the new method has advantages in the SAR image despeckling performance, and can well preserve the local geometric structure information, which is essential for understanding and interpretation of SAR image.

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将从整体数据出发,继续讨论a和b的估计,并且在系数矩阵呈病态的情况下,给出了可估函数c′d的最佳线性无偏估计。在系数矩阵趋于病态的时候,这里提出一种新的估计—局部Stein估计。这是在混合系数线性模型参数的Stein估计的基础上对LS估计的一种改进估计。

This article will start from the whole data, discuss a and b estimates, and under the condition of the coefficient sick matrix, c’d can be estimated functions are given the best linear unbiased estimation. Here presents a new estimation, local Stein estimation. Stein, this is the coefficient of mixed linear model parameters estimated on the basis of an improved estimation of LS estimation.

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抄有《云谣集》的斯1441、伯2838以及保存了大量曲子辞的2607、伯3128是最重要的三种敦煌曲子辞文献，这三种曲子辞文献的抄写年代问题尚未最终解决。通过伯2838斋文中的“令公”一词结合斯1441中的相关信息，可以推知《云谣集》抄写于928年至935年间或稍晚。通过对斯2607两面文书正背面关系的考查，再结合该卷点检历中相关僧人的生平，可确定斯2607之曲子辞抄写于十世纪中叶左右。通过伯3128中三首《望江南》与伯4889定千诗相互关系的考查，可得知伯3128之曲子辞的抄写年代上限为944年。

There are three most important documents of Dunhuang Quzici———Stein.1441 and Pel.chin.2838,the manu-scripts of Yunyaoji and Stein.2607 and Pel.chin.3128,whose copying time was still unknown.By the evidence of the word———“Ling-gong”and in combination with other evidences to infer that Yunyaoji was copied between the years 928 and 935 or later.By the research of the relationship of Stein.2067 and in combination with the monk’s life from the docu-ment inside Stein.2067,we conclude that the copying time of Stein.2067 is at the middle of the tenth centuary.By the re-search of the relationship between three pieces Wanjiangnan in Pel.chin.3128 and Dingqian’s poem in Pel.chin.4889,we could know that the copying time of Stein.2067 is after the year 944.

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为了有效去除图像噪声且能更好地保护图像细节，提出一种基于Contourlet变换和改进NeighShink的图像去噪方法。首先将图像进行Contourlet变换，利用stein无偏风险估计在各尺度各方向子带上进行启发式阈值估计；然后根据邻域窗能量将低能量系数置0，高能量系数采用近似最大似然估计法估计其方差，再用最小均方误差准则得到真实系数的估计；最后进行邻域系数收缩。实验表明，该方法能有效地去除图像中的噪声，获得更高的峰值信噪比，并且图像的边缘细节得到很好的保护。

In order to eliminate the noise in the image effectively and to protect the image detail better， this paper proposed a new method for image denosing based on Contourlet transform and improved NeighShink. It used the stein unbiased risk estimating in the d

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敦煌大方盘城(昌安仓)被斯坦因定名为河仓城。后来李正宇先生推翻了斯坦因的谬说,才由敦煌市博物馆开始寻找真正的河仓城。2005年七八月间,敦煌市博物馆在玉门都尉府以西的榆树泉盆地发现了一座古城,其位置、规模、保存现状,与敦煌文献《沙州都督府图经》、《敦煌录》、《沙州归义军图经略抄》中有关河仓城的记载是一致的。本文就2005年发现的古城为河仓城作一考述。

Since the Dangfangpan city in Dunhuang was identified as the Hecang city by Aurel Stein, the real Hecang city gradually faded out of people’s sight. Later, Mr. Li Zhengyu corrected this error made by Stein, and the Dunhuang Museum began to search for the real site of Hecang. In July-August 2005, an ancient city site was found by the Dunhuang Museum in the basin of the Yulinquan extending west to the Yumen. This site is consistent with the records in various Dunhuang documents about Hecang in location, size, and preservation condition. This paper aims to explain why it should be identified as the site of the real Hecang city.

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介绍华能珞璜电厂引进的法国STEIN公司生产的强制循环亚临界W型火焰锅炉及燃烧系统，针对1＃炉W型火焰锅炉在运行中存在的燃烧恶化问题，进行200 MW负荷燃烧试验，并通过对比分析，对制粉系统、风烟系统进行相应整改，使该锅炉在低负荷情况下安全、稳定、经济地运行。

This essay introduces the forced circulation subcritical W-shape flame boiler and combustion system intro-duced from COMPAGINE DE FIVES-LILLE DMS/STEIN HEURTEY/FCB CINETIC/PROCEDAIRE by Luohuang Power Plant of CHNG .In order to solve the problem of combustion deterioration during the operation of the W-shape flame boiler of 1#boiler,the 200MW combustion test has been implemented .Based on the comparative analysis ,the coal-pulverizing system and the air-gas system have been improved to ensure the safe ,stable and economical opera-tion of the boiler under the low-load condition .

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利用 Range和 Siu的方法，给出了 Stein流形上具有非光滑边界强拟凸域上含参数m的?g＝f的解的一致估计，其特点是所求解g的范数能被f的范数所控制，由于在整个估计的过程中不含边界积分，可以避免边界积分的复杂估计，并且积分密度不必定义在边界上，而只需定义在区域内。

In this paper,the authors by means of the method of Range and Siu,give the uniform esti-mate of solution of?- equation?g=f with parameter m on strictly pseudoconvex domain with non-smooth boundary on Stein Manifolds.The result shows that the norm of the solution g can be con-trolled by the norm of f .During the uniform estimate,it doesn’t involve integral on boundary,so we can avoid complex estimates of boundary integrals and moreover the density of integral is not necessa-rily defined on boundary but only in the domain.