基于长度信息和深度卷积神经网络分类建模的蛋白质二级结构预测方法

提出基于蛋白质长度信息和深度卷积神经网络分类建模的方法(Length Information and Deep Convolutional Neural Networks, LIM-DCNN),实现对于蛋白质二级结构的预测。实验得到的6分段模型,预测CASP9、CASP10、CASP11、CASP12和CB513的Q3准确率分别为83.67%、78.99%、78.53%、71.52%和85.94%,说明了基于蛋白质长度分类建模的有效性,并且实验得到的CB513结果明显优于其他许多经典的预测算法。

网络群体传播中非正式信息长度对传播效果影响研究

在网络群体传播中,非正式信息特征之一的信息长度直接影响到信息的传播效果,对信息传播规律进行研究,正确引导网络群体传播行为具有重大的意义。本文以BBS论坛这一非正式信息为研究平台,选取专业类论坛、综合类论坛及灌水类论坛作为研究对象,统计相关数据,运用合理的信息传播程度评价指标,对不同长度下非正式信息的传播效果进行评价,探索网络传播的相应规律。

融合多尺度跨度特征的谓语中心词识别模型

针对谓语中心词识别模型中存在缺失跨度长度信息和多尺度跨度关联信息等问题,提出一种融合多尺度跨度特征的汉语谓语中心词识别模型。首先,使用ChineseBERT预训练语言模型和双向长短期记忆(BiLSTM)网络提取文本中包含上下文信息的字符向量序列;其次,利用线性神经网络对字符向量进行初步识别,形成跨度遮蔽矩阵;然后,将字符向量序列二维化表示为跨度信息矩阵,使用多尺度卷积神经网络(MSCNN)对跨度信息矩阵进行运算,提取跨度的多尺度关联信息;最后,采用特征嵌入神经网络嵌入跨度的长度信息,丰富跨度的特征向量以识别谓语中心词。实验结果表明,该模型能够有效融合跨度的多尺度关联信息和长度信息,提升谓语中心词识别的性能,相比于同类模型中性能最优的谓语中心词识别模型的F1值提升了0.43个百分点。

一种计算断裂信息维的方法及其应用

对断裂数据化处理,得到断裂控制点。以断裂控制点为约束,对断裂进行点插值,以单个统计单元为视窗,统计落入不同栅格内的插值点数目,进而求得插值点落入不同栅格的概率,对变量数据拟合,得到断裂信息维以及相关系数。将该思路应用在金湖凹陷阜二段断裂分形评价中,分别计算了断裂长度信息维、面积信息维。结果表明,90%以上的统计单元相关系数>0.9,断裂发育区具有较高的自相似性,断裂总体分形特征曲线的相关系数>0.999。金湖凹陷断裂的计算表明,该思路是测量断裂信息维的有效方法,能够提高工作效率,具有较好的应用前景。

主曲线研究综述

主曲线 ( principalcurves)是第一主成分的非线性推广 ,第一主成分是对数据集的一维线性最优描述 .主曲线强调寻找通过数据分布的“中间”(middle)并满足“自相合”的光滑一维曲线 ,其理论基础是寻找嵌入高维空间的非欧氏低维流形 .该文着重介绍了主曲线发展的动机、理论基础、典型的主曲线方法和算法实现及其不同领域的应用 ,并对存在的问题进行了分析 .

网络综合布线系统设计中水平布线双绞线的计算

网络综合布线系统设计中做工程预算时水平布线双绞线(一般采用非屏蔽双绞线UTP)的计算在其中占有很大比重,而对于水平布线双绞线的计算如果按照传统计算方法,存在较大的误差可能.文章详细介绍从实际工程实践出发按照不同工程方案采用不同的预算方法,尽量提高工程预算准确度,并以实际工程案例加以比较说明.

基于相空间重构理论的单变量金融时间序列波动预警

针对单变量金融时间序列,本文基于相空间重构理论和Shannon信息传输理论提出PSRIDL波动预警方法,对深交所平安银行价格波动序列进行实证。研究发现:在序列接近波动转换临界之前,PSR-IDL指数显著增加并且连续突破警戒阈值;PSR-IDL在接近波动转换临界点之前100天里有74天发出清晰预警信号,但经典的波动预警指标CSD却没有发出清晰稳定的预警信号。这表明,在缺少有效预测模型的情况下,PSR-IDL用作单变量金融时间序列波动临界转换预警是可行有效的。

Turbo码系统仿真及性能分析

在描述Turbo码的基本结构的基础上 ,对Turbo码进行计算机仿真研究 ,通过系统仿真讨论影响Turbo码性能的一些主要因素 。

Gaussian mixture model clustering with completed likelihood minimum message length criterion

An improved Gaussian mixture model （GMM）- based clustering method is proposed for the difficult case where the true distribution of data is against the assumed GMM. First, an improved model selection criterion, the completed likelihood minimum message length criterion, is derived. It can measure both the goodness-of-fit of the candidate GMM to the data and the goodness-of-partition of the data. Secondly, by utilizing the proposed criterion as the clustering objective function, an improved expectation- maximization （EM） algorithm is developed, which can avoid poor local optimal solutions compared to the standard EM algorithm for estimating the model parameters. The experimental results demonstrate that the proposed method can rectify the over-fitting tendency of representative GMM-based clustering approaches and can robustly provide more accurate clustering results.

优美图随机嵌入路径耦合像素优化的图像隐写

目的为了解决当前图像隐写方案不可感知能力差、秘密信息嵌入路径随机性较低、难以抵御盲隐写攻击,以及隐写容量小等问题。方法提出优美图随机嵌入路径耦合像素优化控制的图像无损隐写术。基于HIWT机制将载体图像转换为频域整数系数,实现无损隐写。定义图像直方图修改规则,构造隐藏信息长度估算模型,确定图像分块的频域表示,增强该算法的可靠性。引入LSB替代,设计像素区间控制机制,缩小密文与载体之间的嵌入误差。再嵌入图论,构建优美图,获取随机矩阵,确定秘密信息自适应随机嵌入路径,增强隐写的不可感知性能。借助逆向HIWT获取隐写图像。结果与当前隐写方案相比,文中隐写术具备更强的不可感知性,有效降低了阶梯效应,且隐写容量更高,提取图像无失真。结论文中算法可对图像进行安全无损隐藏,有效保护图像可靠传输。

基于STP相关马尔可夫型演化博弈稳定性研究

文章研究一类具有τ长度信息的相关马尔可夫型演化博弈问题。使用矩阵半张量积的方法,将研究的博弈模型代数化表示,进而利用李雅普诺夫函数给出该演化博弈稳定的充分必要条件,给出构造李雅普诺夫函数的算法;最后通过一个实例,验证了本文理论结果的有效性。

网络群体传播中非正式信息长度对传播效果影响研究

在网络群体传播中,非正式信息特征之一的信息长度直接影响到信息的传播效果,对信息传播规律进行研究,正确引导网络群体传播行为具有重大的意义。以BBS论坛这一非正式信息为研究平台,选取专业类论坛、综合类论坛及灌水类论坛作为研究对象,统计相关数据,运用合理的信息传播程度评价指标,对不同长度下非正式信息的传播效果进行评价,探索网络传播的相应规律。

Test Stability of Uster Advanced Fiber Information System(AFIS)

To study test stability of Advanced Fiber Information System(AFIS),card sliver produced in two experiments(12 plans in each experiment)were tested by AFIS.By a statistic analysis of the test results,the number of test times that can get a reliable test reliability(hereinafter this number of test times is referred to as Reliable Test Times,RTT)of test parameters and the coefficient of variation(CV%)values of 30 test results of each experiment plan were obtained.It's concluded that some parameters,such as length,seed coat nep(SCN)size,nep size and immature fiber content(IFC),etc.are very reliable by a test of ten or more times,but other parameters,such as SCN content,trash content,and visible foreign matter(VFM)content,etc.are not reliable until they are tested over 100 times.

An Elegant Universe is a Necessity, Not Just a Case

We believe that well-known principles and relationships between physical entities are the key for a deep knowledge of reality. However, they must be applied using innovative points of view, points of view that can be provided by, for example, experts on information theory （as we are）. Our previous efforts in this direction led to a fascinating result： the theoretical total mass ofa spacetime in which Planck＇s length is an observer-independent scale of length is equal （both in expression and value） to the mass of our portion of Universe measured by national aeronautics and space administration wilkinson microwave anisotropy probe （NASA WMAP） spacecraft. In the following paragraphs we＇ll show how granularity （i.e., discontinuity） of physical entities of our portion of observable spacetime descends directly from the principles of information theory, and how a physical theory about the discontinuity of reality built on these basis can lead to an elegant descriptions of both microcosm and macrocosm.

A simple method to extract glacier length based on Digital Elevation Model and glacier boundaries for simple basin type glacier

Glacier length is a key morphological element that has many glaciological applications; however, it is often difficult to determine, especially for glaciers that cover larger spatial areas or those that exhibit frequent temporal change. In this paper, we describe a new Arc GIS-based method that can derive glacier flow lines for determining glacier length based on digital elevation model and glacier outlines. This method involves(1) extraction of the highest and lowest points on a glacier,(2) calculation of 10-m contour lines on the glacier from 10 m to 100 m height, and(3) connection of the midpoints of each contour line with the highest and the lowest points in order to create a flow line, which is subsequently smoothed. In order to assess the reliability of this method, we tested the algorithm's results against flow lines calculated using field measurements, analysing data from the Chinese Glacier Inventory, and manual interpretation. These data showed that the new automated method is effective in deriving glacier flow lines when contour lines are relatively large; in particular, when they are between 70 m and 100 m. Nonetheless, a key limitation of the algorithm is the requirement to automatically delete repeated and closed curves in the pre-treatment processes. In addition to calculating glacier flow lines for derivation of glacier length, this method also can be used to effectively determine glacier terminus change.

Preliminary Analysis of Population Genetic Diversity of Cultivated Laminaria japonica Sporophyte via AFLP Technique

The amplified fragment length polymorphic DNA (AFLP) technique was adopted to estimate the population genetic polymorphism among 30 sporophytes of Laminaria japonica collected from a cultivating farm in Rongcheng,China.Three methods were used for genomic DNA extraction from Laminaria japonica sporophyte and only the products obtained using the improved genomic DNA extraction kit method proved qualified for AFLP analysis.The parameters of the method were optimized.Samples of forty milligrams and the cell lysis time of 120 min were suggested to replace the parameters recommended by the manufacturer.Thirty individuals of Laminaria japonica from the same cultivating site were investigated using one pair of selective primers.A total of 21 loci were obtained and 17 of them were polymorphic.The mean percent age of polymorphic loci of this population was 80.95%.The Nei's gene diversity (H) within this population was 0.3028 and the average Shannon's Information index (I) was 0.4498.A genetic distance matrix among different individuals was constructed as well.Through this study,an applicable AFLP genetic analysis working system for Laminaria japonica sporophyte was established.The results of this research also revealed a high level of genetic diversity within the studied population.

An Improved Unsupervised Approach to Word Segmentation

ESA is an unsupervised approach to word segmentation previously proposed by Wang, which is an iterative process consisting of three phases: Evaluation, Selection and Adjustment. In this article, we propose Ex ESA, the extension of ESA. In Ex ESA, the original approach is extended to a 2-pass process and the ratio of different word lengths is introduced as the third type of information combined with cohesion and separation. A maximum strategy is adopted to determine the best segmentation of a character sequence in the phrase of Selection. Besides, in Adjustment, Ex ESA re-evaluates separation information and individual information to overcome the overestimation frequencies. Additionally, a smoothing algorithm is applied to alleviate sparseness. The experiment results show that Ex ESA can further improve the performance and is time-saving by properly utilizing more information from un-annotated corpora. Moreover, the parameters of Ex ESA can be predicted by a set of empirical formulae or combined with the minimum description length principle.

通货膨胀、影响因素与信息渠道

宏观经济因素对通货膨胀影响的内在传导机制错综复杂,因此,构建反映多变量影响通胀途径的模型较为困难。从"信息渠道"的视角解析各变量影响通胀的过程,利用信息长度区分不同变量的传导路径,则可构建一个可以近似模拟通胀影响传导效应的系统。具体步骤是:首先,引入扩展的菲利普斯曲线,刻画影响通胀的理论机制;其次,引入信息长度概念,利用物理学中的热传导方程,建立各因素通过信息渠道影响通胀的传导模型;最后,利用向量误差修正模型冲击响应函数的长短期分解技术,研究产出、货币、国际商品价格以及政策因素对通货膨胀的长期及短期影响,并分析各变量传导中的信息阻滞特征及原因。

Spatio-temporal changes in agricultural hydrothermal conditions in China from 1951 to 2010

Based on the daily observation data of 824 meteorological stations during 1951-2010 released by the National Meteorological Information Center, this paper evaluated the changes in the heat and moisture conditions of crop growth. An average value of ten years was used to analyze the spatio-temporal variation in the agricultural hydrothermal conditions within a 1 km2 grid. Next, the inter-annual changing trend was simulated by regression analysis of the agricultural hydrothermal conditions. The results showed that the contour lines for temperature and accumulated temperatures(the daily mean temperature ≥0°C) increased significantly in most parts of China, and that the temperature contour lines had all moved northwards over the past 60 years. At the same time, the annual precipitation showed a decreasing trend, though more than half of the meteorological stations did not pass the significance test. However, the mean temperatures in the hottest month and the coldest month exhibited a decreasing trend from 1951 to 2010. In addition, the 0°C contour line gradually moved from the Qinling Mountains and Huaihe River Basin to the Yellow River Basin. All these changes would have a significant impact on the distribution of crops and farming systems. Although the mechanisms influencing the interactive temperature and precipitation changes on crops were complex and hard to distinguish, the fact remained that these changes would directly cause corresponding changes in crop characteristics.

A DIFFERENTIAL GAME MODEL FOR A DEVELOPING AND A DEVELOPED COUNTRY

A differential game (DG) model for a developing and a developed country is considered.Each player makes decisions about how much resource to be used to restrict the opponent's developmentso as to maximize his weighted sum of current consumption and final output.Current consumption isassumed to be preferred to final output for both players.The developing country is assumed to havea higher economic growth rate and a higher preference to final output,whereas the developed countryis assumed to have a higher initial income and a higher efficiency in restricting his opponent.Thisproblem is investigated under three kinds of information structures,i.e.,a zerosum,a nonzero-sum,anda Stackelberg game.Open-loop equilibrium solutions are obtained for all the three cases.Economicimplications of the result are provided.