MIMO-OFDM系统中基于压缩感知的信道参数反馈方法

为了解决MIMO-OFDM系统中基于完全信道状态信息预编码所面临的反馈链路开销大的问题,提出将压缩感知技术应用于这种预编码的信道状态信息的反馈阶段。在接收端通过压缩感知技术对由信道估计得出的信道状态信息进行观测,将少量的观测值反馈到发送端,在发送端通过正交匹配追踪算法重构出完全信道状态信息。仿真结果表明,信道状态信息在KLT域的压缩感知性能明显优于DCT域的压缩感知性能,可以由反馈到发送端的少量采样值精确地重构出信道状态信息,降低了反馈链路的开销。     

Researching the Link Between the Geometric and Rènyi Discord for Special Canonical Initial States Based on Neural Network Method

Quantum correlation which is different to the entanglement and classical correlation plays important role in quantum information field. In our setup, neural network method is adopted to simulate the link between the Rènyi discord (α = 2) and the geometric discord (Bures distance) for special canonical initial states in order to show the consistency of physical results for different quantification methods. Our results are useful for studying the differences and commonalities of different quantizing methods of quantum correlation.     

Experimental investigation on color variation mechanisms of structural light in Papilio maackii ménétriès butterfly wings

The body color in animals results from billions of years of their natural evolution in order to evade natural enemies, catch quarries or display themselves beauty, in-vestigation on mechanisms of structural light is an important aspect of bionics. Based on the phenomenon of Papilio maackii ménétriès’ blue scales changing into green ones immediately after dropping some alcohol aqua on the underwing sur-face and soon returning back to the original color, the relationship between micro-structure, optics characteristic of scales and changing color effect were studied using the Olympus Stereomicroscope, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Ultraviolet (UV)-Visible Spectropho-tometer. The color variation mechanisms of blue scales of Papilio maackii mé-nétriès in Chinese Northeast were revealed in this paper. When visible lights trav-eled through the concaver structure with multilayer reflector and the filled medium with different refractive indices, the reflected lights in definite wavelengths pro-duced interference and color at that wavelength came into being. It has important academic reference value to biomimetics design of video stealth materials.     

Research on the Freezing Phenomenon of Quantum Correlation by Machine Learning

Quantum correlation shows a fascinating nature of quantum mechanics and plays an important role in some physics topics, especially in the field of quantum information. Quantum correlations of the composite system can be quantified by resorting to geometric or entropy methods, and all these quantification methods exhibit the peculiar freezing phenomenon. The challenge is to find the characteristics of the quantum states that generate the freezing phenomenon, rather than only study the conditions which generate this phenomenon under a certain quantum system. In essence, this is a classification problem. Machine learning has become an effective method for researchers to study classification and feature generation. In this work, we prove that the machine learning can solve the problem of X form quantum states, which is a problem of physical significance. Subsequently, we apply the density-based spatial clustering of applications with noise (DBSCAN) algorithm and the decision tree to divide quantum states into two different groups. Our goal is to classify the quantum correlations of quantum states into two classes: one is the quantum correlation with freezing phenomenon for both Rènyi discord (     

When benefits outweigh costs: Reconsidering “automatic” phonological recoding when reading aloud.

Skilled readers are slower to read aloud exception words (e.g., PINT) than regular words (e.g., MINT). In the case of exception words, sublexical knowledge competes with the correct pronunciation driven by lexical knowledge, whereas no such competition occurs for regular words. The dominant view is that the cost of this “regularity” effect is evidence that sublexical spelling-sound conversion is impossible to prevent (i.e., is “automatic”). This view has become so reified that the field rarely questions it. However, the results of simulations from the most successful computational models on the table suggest that the claim of “automatic” sublexical phonological recoding is premature given that there is also a benefit conferred by sublexical processing. Taken together with evidence from skilled readers that sublexical phonological recoding can be stopped, we suggest that the field is too narrowly focused when it asserts that sublexical phonological recoding is “automatic” and that a broader, more nuanced and contextually driven approach provides a more useful framework. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Youth violence and positive psychology: Research potential through integration.

Positive psychologists can study the relation between some of the discipline's core dimensions and aversive outcomes, including youth violence. Dimensions such as gratitude, forgiveness, sense of meaning, altruism (or at least apparent altruism), prudence, and humility have received attention within positive psychology, and evidence is reviewed suggesting that these may also deserve empirical attention in terms of their relation to youth violence and even their potential to reduce youth violence. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

关于abc猜想

证明了:存在无穷多组正整数(a,b,c)满足a+b=c,gcd(a,b,c)=1,c>32G,其中G是乘积abc中不同素因数的乘积.     

煤与瓦斯突出强度的FOA-SVM预测模型与应用

为了能够对煤与瓦斯突出进行准确的辨识,本文提出将果蝇算法(FOA)与支持向量机(SVM)相结合的预测方法.首先通过Karhunen-Loève变换(K-L变换)进行特征提取,降低特征向量的维数,减小运算量;然后将经过K-L变换的样本作为FOA-SVM模型输入,通过果蝇算法全局寻优,自动搜索符合本预测模型最佳参数组合.通过对预测模型的训练与仿真表明:本文提出的方法具有设计实现简单,辨识精度高、推广能力强的特点,为煤矿灾害预测提供理论支持.     

非迷向Heisenberg群上凸函数的性质研究

Homander向量场上凸函数的性质对研究完全非线性次椭圆方程的正则性起关键作用.针对一类特殊的Homander向量场——非迷向Heisenberg群H^2（a1,a2）,通过引入群上的拟距离函数,利用矩阵理论与粘性解理论证明了拟距离的凸性和无穷调和性,得到了H^2（a1,a2）上Monge-Ampère测度的正定性质.证明了一个与凸函数相关的Harnack型不等式和Aleksandrov型极大值原理.研究结果可以为进一步研究一般H mander向量场上凸函数的性质和非线性次椭圆方程的正则性提供理论基础.     

从爱马仕年题设计解读其独特的营销手段

针对法国爱马仕品牌成功的营销手段——年题,通过对年题订立的背景、推广的方式、对品牌提升的作用、设立的因素等研究,得出爱马仕成功品牌营销带给人们的启示:品牌要有自己独特的个性,品牌的推广活动要准确锁定自己的目标客户群,品牌的风格与定位在于不懈的坚持.同时认为年题的制定不是一蹴而就的事情,也不是对所有品牌都适用,必须注意品牌文化的建设、积累和沉淀,而且在借鉴成功品牌文化和营销手段的同时,要注重自己品牌文化的起源和创建,需要有自己的历史和创新.