融合节点重要性的通信系统无特征网络链路预测方法

通信系统的无特征网络链路中,由于忽略了节点的特征属性,导致预测评估结果的曲线下面积(Area Under Curve,AUC)值较低。针对上述现象,提出融合节点重要性的通信系统链路预测方法。提取无特征网络中节点的局部特征,构建节点的时间序列数据。计算每个节点的重要性,利用节点的重要性和时间序列数据,通过特定的算法,获取每个节点的预测值,从而实现无特征网络链路的预测。实验结果表明,该方法预测评估结果的AUC值较高,能够更准确地预测网络中的链路连接。

无特征吸收峰物质的分光光度法测定的数学方法

通过对不具有特征吸收峰物质的吸收谱图进行数学处理,不仅可实现对不具有特征吸收峰物质的定量分析,而且可提高方法的灵敏度和线性范围。

一种标定指纹无特征区的新方法

指纹中无细节点特征的区域,即为无特征区。受指纹细点线位置、指纹纹线流向等因素的影响无特征区域的分布显高度随机性,因此无特征区本身就是一种高质量特征,可用于指纹识别。但是由于无特征区域形状会根据指纹细节点位置的变化而发生改变,我们很难使用一种统一的模型来表达无特征区域。研究设计了一种新颖的无特征区域表达方法,该方法使用网格标定的方式来实现对无特征区域的表达建模,首先沿横向和纵向把指纹分成若干等份,然后在各网格中统计无特征区域的分布位置与纹线条数等信息。为验证方法性能,构建一个小型指纹数据库,该数据库包含100枚三面捺印油墨指纹。实验结果显示两枚不同指纹中单个无特征区信息相同的概率为1%,多个(2个及以上)无特征区信息相同的概率为0%。可以实现指纹无特征区统计的稳定性。

一种无特征混沌扩频波形的设计

混沌扩频波形具有很高的类随机性和复杂性,被广泛运用于安全保密通信领域。但是,常规的混沌波形的频谱通常是一个有色频谱,从而为敌对检测截获方提供了可利用的有效特征。因此,从混沌序列设计出发,设计了一种无特征的混沌扩频序列,并且利用该混沌扩频序列产生出一种无特征混沌扩频波形。仿真结果表明,该波形在一阶到四阶的累积量特性都与高斯白噪声保持一致,使其无法与高斯白噪声区分,从而使波形具有很好的低检测低截获特性。

基于海上多目标的视频卫星稳像方法

视频卫星稳像是实现卫星视频高精度应用的前提和基础。由于卫星姿态指向精度不足以及平台姿态稳定度不足等原因,通常需要引入基于图像配准的稳像技术以实现视频凝视的效果;然而在观测海上目标时,由于没有控制点标校,帧间无法开展基于特征点的配准,所以天基凝视视频相机在观测时经常会出现目标在像面上反复跳变的问题。提出一种基于海上多目标舰船检测的全局前景视频稳像GFVS(global foreground video stabilization)方法,构建高斯误差模型,通过优化后位置和原始位置的偏差修正像面错位,最后进行稳像视频合成。实验结果表明,该方法能够有效解决海上控制点不足时抖动图像难以配准的问题,得到更加稳定的凝视视频效果,应用吉林一号卫星星座采集的两组卫星数据进行验证实验,最终稳像的误差能够控制在0.9个像素以内。

黑洞错觉验证研究方法进展

黑洞错觉导致的航空事故频发,但对于此问题的内在机制和因果关系并没有合理一致的解释,仍需深入探索。本研究在概述黑洞错觉现象的基础上,梳理了国外对于黑洞错觉早期的各种机制假说以及验证评估过程,阐述了一种最新的机制假说——线偏差错觉,及其验证研究方法,并总结了黑洞错觉的识别预防策略,为后续开展研究奠定基础。

图象拼接中伪匹配的判别和消解

图象拼接就是把边界部分重叠的多幅图象接成一幅完整图象。图象拼接中的困难之一是：当相邻两幅图象重叠区域缺乏显著特征，或者存在多个特征相似的部分，就会发生伪匹配而导致拼接失败。该文基于均方误差曲线和相邻图象之间的空间约束关系，提出了一种伪匹配判别方法。实验表明。

基于深度学习的指纹自动识别技术

本文从学科领域入手,对指纹自动识别技术在发展过程中受人工智能技术影响所产生的新变化进行简述。指纹识别技术作为一种计算机应用技术,其发展与计算机科学的新技术密切相关。人工智能技术,特别是基于深度学习的图像技术的发展使指纹识别算法开启了全新的模式。本文将人工智能在指纹领域的发展分成三个阶段,并对当前所处的第二阶段的发展趋势进行了分析。基于深度学习的指纹识别技术使用图像特征而不是传统细节点特征的方式,改变了法庭科学领域对指纹识别的认知。本文重点对深度学习技术在指纹识别方面的应用模式和典型的技术方法进行了论述,给出了基于深度学习的指纹识别技术方案图,对技术方案中的网络模型设计等重要步骤逐一进行了说明,提出了图像处理、降维等几个需要重点攻坚的技术环节。对现有的可为指纹识别借鉴使用的深度网络模型进行了介绍,如:卷积神经网络、自编码器网络。最后对人工智能指纹识别算法与传统算法的性能进行了对比。

人工智能指纹识别技术在警务实战中的应用

大数据时代,海量指纹数据的汇聚对指纹识别系统的比对精度和速度带来了挑战。能否实现对现场指纹图片在海量样本库中的“以图搜图”,即无需对指纹图片进行特征编辑即可快速比对(无特征比对),是一线部门提出的实战需求。本文以“云痕”智能指纹识别系统为例,介绍一种将人工智能引入指纹识别领域,采用自适应小波框架与主动式深度学习的比对技术和总线级协同计算的计算技术,建设指纹亿级数据库的技术创新,使得指纹的比对精度和速度得到提升。结合笔者单位警务工作,介绍了“云痕”系统应用于电脑端和移动端的指纹比对场景,对比分析了人工智能与传统指纹识别系统在指纹表述信息量及比对精度等方面的技术优势,并对人工智能在指纹识别方面的应用前景进行了展望。

Comparative Study on Photosynthetic Characteristics of Different Catalpa bungei Clones

[Objective] This study aimed to provide scientific basis for the early selec-tion and breeding of excellent Catalpa bungei clones. [Method] The Li-6400 portable photosynthesis system was used to analyze the photosynthetic characteristics of five Catalpa bungei clones （1-3, 1-4, 004-1, 015-1 and 7080）. [Result] Al five Catalpa bungei clones had similar change trends of light response curves, but their maxi-mum net photosynthetic rates （Pmax） were in the order of 1-3＆gt;7080＆gt;015-1＆gt;004-1＆gt;1-4, showing that clone 1-3 and clone 7080 had strong light environmental adapt-ability with the light saturation points （LSP） of 1 147.97 μmol/m2＆#183;s and 1 196.31μmol/m2＆#183;s, respectively, while clone 1-4 had the narrowest range of adaptation to light. There were differences in the total photosynthetic amount per area among the five clones that clone 1-4 was the best of 433 974.24 μmol/m2, fol owed by clone 1-3 of 401 290.20 μmol/m2. The transpiration rates （Tr） and stomatal conductances （Cond） of the five clones presented the same change trend. And the diurnal varia-tion curves of net photosynthetic rate （Pn） of clone 1-3, 1-4 and 015-1 showed two typical peaks with obvious midday depression, while clone 004-1 and 7080 didn’t. [Concluson] Considering a variety of photosynthetic characteristics of indica-tors, photosynthetic capacity of clone 1-3 was the best among the five Catalpa bungei clones.

Heuristic feature selection method for clustering

In order to enable clustering to be done under a lower dimension, a new feature selection method for clustering is proposed. This method has three steps which are all carried out in a wrapper framework. First, all the original features are ranked according to their importance. An evaluation function E（f） used to evaluate the importance of a feature is introduced. Secondly, the set of important features is selected sequentially. Finally, the possible redundant features are removed from the important feature subset. Because the features are selected sequentially, it is not necessary to search through the large feature subset space, thus the efficiency can be improved. Experimental results show that the set of important features for clustering can be found and those unimportant features or features that may hinder the clustering task will be discarded by this method.

Characteristic atom sequences of Nb-Mo alloys system in BCC structure and properties of disordered alloys

Comprehensively considering energy, volume and electronic structure of alloys, the ninth equation was determined as the interaction function of Nb-Mo alloys system in BCC structure on the basis of idea of systematic science of alloys, experimental lattice constants and heats of formation of disordered Nb（1-x）Mox alloys. The structural parameters and properties of Nb and Mo characteristic atoms sequences and corresponding characteristic crystals sequences were determined in Nb-Mo alloys system. The electronic structure and physical properties of disordered Nb（1-x）Mox alloys system were calculated according to concentration of characteristic atoms of disordered alloys. The change trend of physical properties is the same as that of electronic structure.

浅谈不动产数据整合的技术方法

在不动产数据整合工作中,“已有资料的整理与文档编制”与“不动产资料的落宗落幢”是一个有机的整体——“已有资料的整理与文档编制”的科学合理与否,对“不动产资料的落宗落幢”工作的效率具有很大的制约性;由于已有不动产资料定位数据的缺泛,对房屋的“灭失”及相似房屋、无特征房屋的落宗落幢工作带来了极大的不便。本文对上述问题进行了粗浅探讨。

Structure and Classification of Haemocytes in the Bivalve Mollusc Meretrix meretrix

Light and electron microscopic studies were carried out in order to characterize haemocytes in the bivalve mollusc Meretrix meretrix. According to nucleus and cytoplasm characters, four types of haemocytes were recognized： agranular haemocytes, lymphoid haemocyte, large granular and small granular haemocytes. Agranular hamocyte is the main cell type, accounting for 75%. It is agranular with rich organelles in cytoplasm, including mitochondria, golgi body and endoplasmic reticulum. Glycogen deposits were usually found in this cell type. The number of lymphoid haemocyte accounts for 1% - 2%. This cell type is agranular and shows a high ratio of nucleus to cytoplasm. A few organelles were found. High electrondense granules with diameters of 0.2 - 0.5μm and rich organelles were found in small granular haemocyte. The proportion of this cell type is about 15%. Rich granules of high electron-dense with diameters of 0.8- 2.4μm were found in large granular haemocyte. The proportion of this cell type is about 10%, and the quantity of organelles is the least.

Colonoscopic yield of colorectal neoplasia in daily clinical practice

AIM:To assess the prevalence and location of ad-vanced neoplasia in patients undergoing colonoscopy,and to compare the yield per indication.METHODS:In a multicenter colonoscopy survey (n = 18 hospitals) in the Amsterdam area (Northern Holland),data of all colonoscopies performed during a three month period in 2005 were analyzed. The location and the histological features of all colonic neoplasia were recorded. The prevalence and the distribution ofadvanced colorectal neoplasia and differences in yield between indication clusters were evaluated. Advanced neoplasm was defi ned as adenoma > 10 mm in size,with > 25% villous features or with high-grade dyspla-sia or cancer.RESULTS:A total of 4623 eligible patients underwent a total colonoscopy. The prevalence of advanced neo-plasia was 13%,with 281 (6%) adenocarcinomas and 342 (7%) advanced adenomas. Sixty-seven percent and 33% of advanced neoplasia were located in the distal and proximal colon,respectively. Of all patients with right-sided advanced neoplasia (n = 228),51% had a normal distal colon,whereas 27% had a syn-chronous distal adenoma. Ten percent of all colono-scopies were performed in asymptomatic patients,7% of whom had advanced neoplasia. In the respective procedure indication clusters,the prevalence of right-sided advanced neoplasia ranged from 11%-57%. CONCLUSION:One out of every 7-8 colonoscopies yielded an advanced colorectal neoplasm. Colonoscopy is warranted for the evaluation of both symptomatic and asymptomatic patients.

Self-Organization Approaches for Optimization in Cognitive Radio Networks

Cognitive radio(CR) is regarded as a promising technology for providing a high spectral efficiency to mobile users by using heterogeneous wireless network architectures and dynamic spectrum access techniques.However,cognitive radio networks(CRNs)may also impose some challenges due to the ever increasing complexity of network architecture,the increasing complexity with configuration and management of large-scale networks,fluctuating nature of the available spectrum,diverse Quality-of-Service(QoS)requirements of various applications,and the intensifying difficulties of centralized control,etc.Spectrum management functions with self-organization features can be used to address these challenges and realize this new network paradigm.In this paper,fundamentals of CR,including spectrum sensing,spectrum management,spectrum mobility and spectrum sharing,have been surveyed,with their paradigms of self-organization being emphasized.Variant aspects of selforganization paradigms in CRNs,including critical functionalities of Media Access Control(MAC)- and network-layer operations,are surveyed and compared.Furthermore,new directions and open problems in CRNs are also identified in this survey.

Solutions of the Schrdinger Equation for PT-Symmetric Coupled Quintic Potentials in Two Dimensions

This paper deals with the solutions of time independent Schrodinger wave equation for a two-dimensional PT-symmetric coupled quintic potential in its most general form. Employing wavefunction ansatz method, general analytic expressions for eigenvalues and eigenfunctions for first four states are obtained. Solutions of a particular case are also presented.

Cyclostationary Feature Detection Based Spectrum Sensing Algorithm under Complicated Electromagnetic Environment in Cognitive Radio Networks

This paper focuses on improving the detection performance of spectrum sensing in cognitive radio(CR) networks under complicated electromagnetic environment. Some existing fast spectrum sensing algorithms cannot get specific features of the licensed users'(LUs') signal, thus they cannot be applied in this situation without knowing the power of noise. On the other hand some algorithms that yield specific features are too complicated. In this paper, an algorithm based on the cyclostationary feature detection and theory of Hilbert transformation is proposed. Comparing with the conventional cyclostationary feature detection algorithm, this approach is more flexible i.e. it can flexibly change the computational complexity according to current electromagnetic environment by changing its sampling times and the step size of cyclic frequency. Results of simulation indicate that this approach can flexibly detect the feature of received signal and provide satisfactory detection performance compared to existing approaches in low Signal-to-noise Ratio(SNR) situations.

Characteristics of fissures and pores of anthracite in Jincheng by SEM

Anthracite in Jincheng is a highly metamorphic coal and its system of fissures and pores is differentfrom that of low and medium ranked coal.In order to discover their characteristics,69 samples were collected from 18 CBM wells in Zhengzhuang in Jincheng and their fissures and pores were observed by a Scanning Electron Microscope(SEM).To the naked eyes and by SEM,the pores in the Jincheng anthracite are seen to have abundant mold pores with isolated,shallow and poor connectivity(diameters between 1～50 μm) and few plant tissue pores,gas pores,and solution pores.Most of the fissures are filled with clay minerals or closed;while open fissures are not often visible in the Jincheng coal(aperture between 3～10 μm).These characteristics are determined by the high rank and high vitrinite content of the coal.The existence of too many mold pores and filled fissures does not allow the migration of methane,hence hydraulic fracture stimulation will be required and is an effective method of adding and connecting fissures to enhance CBM production.

A NOVEL ULTRA WIDEBAND MONOPOLE ANTENNA WITH BAND-NOTCHED CHARACTERISTICS

A simple and compact microstrip-fed Ultra WideBand(UWB) printed monopole antenna with band-notched characteristic is proposed in this paper.The antenna is composed of a square ring with a small strip bar,so that the antenna occupies about 7.69 GHz bandwidth covering 3.11～10.8 GHz with expected band rejection from 5.12 GHz to 5.87 GHz.A quasi-omnidirectional and quasi-sym-metrical radiation pattern is also obtained.This kind of band-notched UWB antenna requires no ex-ternal filters and thus greatly simplifies the system design of UWB wireless communication.