基于回流电感应电源的研究与应用

利用电气化铁路架空回流线与大地间的电位差研制的高压感应电源,有效地解决了铁路沿线尤其是隧道内对交流电源的需要,使一些智能监控设备得以在铁路沿线安装使用。介绍回流电感应电源的工作原理、技术参数、性能特点。     

基于数学形态学的遥感图像道路提取

从遥感影像上提取道路信息是一个重要的研究方向。首先读入遥感图像并对其进行增强处理;然后通过直方图均衡化选择合理的分割阈值,得到二值化图像;最后,基于数学形态学方法进行道路识别提取。利用ENVI+IDL,以高分辨率遥感图像IKONOS为数据源来验证方法的有效性。实验结果表明,该方法能够很好的提取遥感图像中的道路。     

Combustion optimization model for NO<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript> reduction with an improved particle swarm optimization

Abstract: This paper focuses on the combustion optimization to cut down NO _x emission with a new strategy. Firstly, orthogonal experimental design (OED) and chaotic sequences are introduced to improve the performance of particle swarm optimization (PSO). Then, a predicting model for NO _x emission is established on support vector machine (SVM) whose parameters are optimized by the improved PSO. Afterwards, a new optimization model considering coal quantity and air quantity along with the traditional optimization variables is established. At last, the operating parameters are optimized by the improved PSO to cut down the NO _x emission. An application on 600MW unit shows that the new optimization model can cut down NO _x emission effectively and maintain the load balance well. The NO _x emission optimized by the improved PSO is lowest among some state-of-the-art intelligent algorithms. This study can provide important guides for the low NO _x combustion in the power plant.     

具有随机系数的自激振动问题的人工神经网络求解方法

利用人工神经网络技术(BP网络)研究具有随机系数的初轧机自激振动问题，提出了一种Runge-Kutta法和人工神经网络相结合的求解新方法．即利用数值计算和BP网络建立随机系数和稳态振幅之间的关系，从而可直接利用数值积分计算出稳态振幅的统计特性．计算结果表明，所提方法通用性强且可提高计算精度，同时说明摩擦系数的随机特性是轧钢机发生重大事放的重要原因之一．     

ISOLATION AND INDUCTION OF RABBIT BONE MARROW MESENCHYMAL STEM CELLS TO EXPRESS CHONDROCYTIC PHENOTYPE

Ｍｅｓｅｎｃｈｙｍａｌｓｔｅｍｃｅｌｌｓ(ＭＳＣｓ)ｗｅｒｅｍｕｌｔｉｐｏ ｔｅｎｔｉａｌｃｅｌｌｓ ,ｌｏｃａｔｅｄｉｎｂｏｎｅｍａｒｒｏｗ ,ｓｋｅｌｅｔａｌｍｕｓ ｃｌｅａｎｄｓｙｎｏｖｉａｌｍｅｍｂｒａｎｅ ,ｗｈｉｃｈｃｏｕｌｄｄｉｆｆｅｒｅｎｔｉ ａｔｅｉｎｔｏｓｅｖｅｒａｌｔｙｐｅｓｏｆｃｅｌｌｓ,ｓｕｃｈａｓｏｓｔｅｏｃｙｔｅ ,ｃｈｏｎｄｒｏｃｙｔｅａｎｄａｄｉｐｏｃｙｔｅ[1,2 ] .ＳｅｐｅｒａｔｉｏｎｏｆＭＳＣｓｆｒｏｍｂｏｎｅｍａｒｒｏｗｗａｓｒｅｌａｔｉｖｅｌｙｃｏｎｖｅｎｉｅｔ ,ａｕｔ…     

A new buyer-seller watermarking protocol without double embedding

AbstractCopy deterrence is a digital watermarking application which enables a seller to identify the buyers who obtain digital content legally but illegally redistribute it. However, in many buyer-seller watermarking protocols proposed for copy deterrence, the seller has to embed two watermarks into each copy of the digital content before it is sold. In this paper, we propose a new buyer-seller watermarking protocol in which the seller can reduce the number of the embedded watermarks from two to one. The proposed protocol also provides a more efficient solution to the unbinding problem than that of Lei et al’s scheme.     

宫颈癌组织中erbB3、erbB4的表达及意义

目的　探讨erbB3、erbB4在宫颈癌中的表达及意义。方法　应用免疫组织化学HGH SABC方法检测了 5 0例宫颈癌组织 (鳞癌、腺癌各 2 5例 )、15例正常宫颈上皮组织中erbB3、erbB4的表达。结果　宫颈癌组织中erbB3、erbB4阳性表达率显著高于正常宫颈上皮组织 (P <0 .0 5 ) ,两者表达呈显著正相关关系 (r =0 .5 872 ,P <0 .0 0 1)。鳞癌中erbB3、erbB4的表达高于腺癌 ,但无统计学差异 (P >0 .0 5 )。erbB3、erbB4的表达与癌细胞分化程度呈负相关、与临床分期 (FIGO分期 )呈正相关 ,但无论erbB3、erbB4单独表达或同时表达均与宫颈癌预后无统计学意义。结论　erbB3、erbB4在宫颈癌发生发展中可能起到一定作用 ,可以预测宫颈癌恶性程度 ,但不能作为宫颈癌预后独立评价指标     

DETECTION AND SIGNIFICANCE OF HBV IN RENAL TISSUE OF HBV ASSOCIATED GLOMERULONEPHRITIS PATIENTS

ＳｉｎｃｅＣｏｍｂｅｓ[1] ｆｉｒｓｔｌｙｒｅｐｏｒｔｅｄｏｎｅｃａｓｅｏｆｔｈｅＨＢＶ ａｓｓｏｃｉａｔｅｄｍｅｍｂｒａｎｏｕｓｎｅｐｈｒｏｐａｔｈｙ (ＨＢＶ ｍＧＮ )ｉｎ 1971,ｔｈｅｒｏｌｅｏｆｈｅｐａｔｉｔｉｓＢｖｉｒｕｓ (ＨＢＶ)ｐｌａｙｅｄｉｎ ｇｌｏｍｅｒｕｌｏｎｅｐｈｒｉｔｉｓｗａｓ ｇｅｎｅｒａｌｌｙ ｐａｉｄｃｌｏｓｅａｔｔｅｎｔｉｏｎｗｈｅｎｉｔｓｍｅｃｈａｎｉｓｍｗａｓｉｎｖｅｓｔｉｇａｔ ｅｄ .Ｉｔｒｅｍａｉｎｓｕｎｃｅｒｔａｉｎａｔｐｒｅｓｅｎｔ,ｈｏｗｅｖｅｒ ,ｈｏｗＨＢＶｐｌ…     

METADATA EXPANDED SEMANTICALLY BASED RESOURCE SEARCH IN EDUCATION GRID

With the rapid increase of educational resources, how to search for necessary educational resource quickly is one of most important issues. Educational resources have the characters of distribution and heterogeneity, which are the same as the characters of Grid resources. Therefore, the technology of Grid resources search was adopted to implement the educational resources search. Motivated by the insufficiency of currently resources search methods based on metadata, a method of extracting semantic relations between words constituting metadata is proposed. We mainly focus on acquiring synonymy, hyponymy, hypernymy and parataxis relations. In our schema, we extract texts related to metadata that will be expanded from text spatial through text extraction templates. Next, metadata will be obtained through metadata extraction templates. Finally, we compute semantic similarity to eliminate false relations and construct a semantic expansion knowledge base. The proposed method in this paper has been applied on the education grid.     

基于DTW的在线手写签名验证算法

提出了一种基于DTW匹配的以签名能量为特征的在线手写签名验证算法．在线签名验证包括数据采集、预处理、特征提取、匹配判决等部分．侧重签名能量特征提取方法的研究．基于Daubechies小波的方法对签名波形进行分解，提取签名波形在跳变点的能量，抽取15个具有较大能量的跳变点．经DTW比较后，提出了一种新的分类算法．实验表明，对于随机伪造签名，当误拒率为0％时，误纳率小于9％．