基于形状描述直方图的声呐图像目标识别算法

针对水下声呐图像目标检测与识别问题,在图像规格化条件下,定义了几种不同的形状描述子,并统计计算描述子直方图,定义了几种不同的直方图匹配测度函数用以计算直方图间的相似性。分析了算法中关键参数的选取问题。仿真结果表明,基于该算法的识别率可达到98%以上,具有较强的不变性和鲁棒性。通过进一步信息融合算法可快速准确地实现水下声呐图像目标识别,具有较强的应用价值。     

B2B MARKET FORMATION AND WELFARE IMPLICATION IN A BUYER'S MARKET

The emergence of B2B electronic markets has greatly changed the relative bargaining power of buyers and sellers.We study the equilibrium market structure in a buyer＇s market.We find that buyer-controlled B2B markets and neutral B2B markets have different equilibrium structures,and the emergence of B2B markets will increase social welfare,but its effect on buyers and sellers will be different：B2B markets increase the consumer surplus of the end market,but their effects on buyer and seller profits are moderated by the relative bargaining power of buyers and sellers.The profits of the side with much weaker bargaining power will decrease due to the introduction of B2B markets.     

关于米勒体系中国化的探索与思考

米勒体系作为源起于西方国家的针对公民科学素质进行测量的一套测度体系,在中国的应用中不断面临本土化的诘问。通过分析米勒体系及其主要内容,并结合我国当前公民科学素质建设的整体语境,文章尝试提出了一种可能的解决路径——立足国内现实并与国际接轨的分层测度结构,并以此提供对于我国公民科学素质建设及测量的价值导向上的意义。     

广东普通高校化学专业双语教学的调查与分析

通过对广东7所普通本科院校化学专业双语教学情况的调查,针对调查结果和当前高校双语教学中存在的主要问题进行了分析.结合学校和师生的英语实际情况,探讨了普通本科院校化学专业如何更好地开展双语教学的对策.     

H.264中基于图像差值的编码模式快速选择算法研究

分析了现有的基于率失真优化的图像帧编码模式选择方法,指出了该算法运算复杂度高的原因.提出了一种基于图像差值的快速编码算法,详细介绍了该算法的提出思想和可行性分析.给出了基于该算去编码模式的具体选择方法,详细介绍了该算法的提出思想和可行性分析.给出了基于该算法编码模式的具体选择方法,以及其参考帧的选取依据.     

具有分段线性水平截线的双参数Copula函数簇

构造了一类具有分段线性水平截线的双参数Copula函数簇,并讨论了这类Copula函数簇的绝对连续性和极限性质.     

316L不锈钢表面纳米化残余应力对材料性能的影响

高速旋转丝表面纳米化是一种新型的表面纳米化方法,本文对316L不锈钢表面进行纳米化处理,测定残余应力在材料内部的分布.通过分析、对比实验数据,表面纳米化处理方法,能够在材料内部引入大量残余压应力,提升材料的力学性能.     

大班英语口语教学及评估尝试

在教师缺乏的情况下进行大班英语口语教学是不得已的选择,但经过三个学期的实践和不断努力,发现其效果基本接近小班教学,所有受训学生的英语口语表达能力有明显提高．实践表明,这是一种有意义的尝试,是一条节约教学资源和成本并确保教学质量的有效途径．当然,实践过程中也遇到一些问题．     

单操作者大鼠腹腔异位心脏移植模型的建立与改良

目的 学习并改良大鼠腹腔异位心脏移植模型的建立过程,降低手术难度,减短学习周期,使模型易建立以供于移植免疫、病理、药理等方面的研究.方法 建立大鼠腹部异位心脏移植模型,归纳总结整个过程中的操作技巧.结果 正式实验30例,存活29例,存活率96.7％.术中刺伤心脏,开放后无法止血死亡1例,供心阻断时间为(24.2±5.0...     

Analysis of the human protein interactome and comparison with yeast, worm and fly interaction datasets

We present the first analysis of the human proteome with regard to interactions between proteins. We also compare the human interactome with the available interaction datasets from yeast (Saccharomyces cerevisiae), worm (Caenorhabditis elegans) and fly (Drosophila melanogaster). Of >70,000 binary interactions, only 42 were common to human, worm and fly, and only 16 were common to all four datasets. An additional 36 interactions were common to fly and worm but were not observed in humans, although a coimmunoprecipitation assay showed that 9 of the interactions do occur in humans. A re-examination of the connectivity of essential genes in yeast and humans indicated that the available data do not support the presumption that the number of interaction partners can accurately predict whether a gene is essential. Finally, we found that proteins encoded by genes mutated in inherited genetic disorders are likely to interact with proteins known to cause similar disorders, suggesting the existence of disease subnetworks. The human interaction map constructed from our analysis should facilitate an integrative systems biology approach to elucidating the cellular networks that contribute to health and disease states.