A Study And Application of Face Recognition System

人脸识别是近几年来非常受关注的研究课题之一。这一研究领域综合了多个学科：图像处理、模式识别、计算机视觉、神经网络，心理学等等。人脸识别所要解决的问题可以概述如下：给定场景下的静态图像或动态图像序列，应用已知人脸库，从场景里识别一个或多个人。本文研究静态人脸图像识别，这个问题的解决包括：从场景中分割人脸（人脸检测），人脸区域的特征提取、识别或验证。在识别问题中，输入系统人脸图像是未知的人脸，系统将从人脸数据库中找出与输入一致的人脸。本文的主要研究工作：1.本文第一章主要研究与人脸识别相关的神经科学和计算机人脸识别的各种方法，探讨生物识别和计算机识别的相互联系，以及生物识别方法，特别是人脸识别技术...Machine recognition of human face still and video images is one of the active research areas including several disciplines such as image processing, pattern recognition, computer vision and neural networks, psychology and so forth. A general statement of the problem can be formulated as follows: Given still or video images of a scene, identify or verify one or more persons in the scene using a sto...学位：工学硕士院系专业：物理与机电工程学院机电工程系_测试计量技术及仪器学号：20032901

货币政策、同业业务与银行流动性创造

本文通过构造商业银行同业和非同业流动性创造指标,研究了货币政策对银行流动性创造的总体和结构性影响,根据商业银行参与同业业务的不同程度分析了货币政策作用的异质性,并检验了商业银行参与同业业务的影响因素。研究结果表明:第一,货币政策同时影响商业银行的流动性创造增速和结构,宽松的货币政策提高了银行总体流动性创造增速和非同业流动性创造增速,但是降低了同业流动性创造增速;第二,对参与同业业务程度不同的银行,货币政策的影响存在异质性,具体为宽松的货币政策降低了高参与度银行的同业流动性创造增速,提高了低参与度银行的同业流动性创造增速;第三,货币政策显著地改变了银行的同业资产持有比例,银行的风险越高,参与同业业务的程度越高。因此,在宏观审慎政策框架下,应该加强货币政策和金融监管的配合;运用多种货币政策工具,及时进行预调微调;进一步促进金融市场的发展,降低银行对同业业务的过度依赖。国家自然科学基金青年项目“银行系统风险的建模与估计:基于银行同业复杂网络和货币政策视角”(批准号:71501167)、国家自然科学基金重点项目“大数据环境下的经济政策评估和分析的计量理论与方法”(批准号:71631004);;中央高校基本科研业务费专项资金(项目编号:20720171002)的资

Human Face Image Edge Detection Methods and Application

如何确定人脸特征并对这些特征进行有效的提取是非常关键而且复杂的。人脸边缘和轮廓是人脸非常重要的特征。该文研究了边缘检测的原理和各种算法,通过试验验证各种检测方法在人脸图像中对边缘的检测效果,讨论选用在不同阈值下检测的边缘,以及影响检测效果的因素。最后通过实例研究了人脸边缘检测在人脸检测和识别中的具体应用。How to define and extract the feature of human face is a key and complicated problem. The edge and contour of human face is one of important feature. This paper studies the theory of edge detection and different kinds of arithmetical methods. The experiment results are used to confirm the different methods which are employed to test the edge detection results of the human face image. It discusses the consequence of detection when the threshold is varying and the possible factors, which makes the different results. Finally, it studies the application of the edge detection in human face detection and recognition.福建省自然科学基金资助项目(A0310005);; 国家留学回国人员基金资助项目(K13003

A Study of De-noising Methods in Face Recognition System

人脸识别是近几年来非常受关注的研究课题之一,这一研究领域包括:图像处理、模式识别、计算机视觉、神经网络,心理学等多个交叉学科。人脸识别系统非常复杂,其中处理的对象都是人脸图像数据。从现实中获取的图像包含各种噪声信号,使图像数据和现实差距太大。为了快速有效的去除这些噪声信号,本文详细研究了各种去除噪声的方法和原理,通过试验以直观的方式研究几种去噪效果,指出各种方法的优缺点。提出了将小波去除噪声和特征提取相结合以及PCA在噪声去除和特征提取相结合的方法。Machine recognition of human face still and video im- ages is emerging an active research area including several disci- plines, such as: image processing, pattern recognition, computer vision, neural networks, psychology and so forth. The human face recognition system is complex which processes a large of image data. Obtained from reality environment, the images con- tain a lot of noise. In order to de- noise more effectively and quickly, several general de - noising methods and theories are carefully studied in the paper. Compared the methods through the experiences and got results, then, the advantage and disad- vantage of each method are pointed out. The novel methods are suggested, for example, combining wavelet de- noising with fea- ture extraction, combining de- noising with PCA.福建省自然基金(A0310005);; 国家留学回国人员基金资助(K13003

Autonomous Mobile Robotic Architecture and Development Research

【中文文摘】阐述了自主移动机器人体系结构的意义,并对分层式体系结构和包容式体系结构这两种典型体系结构详细比较分析后,在此基础上研究了基于两者优点的混合型体系结构。最后,对该领域的研究热点进行了阐述,并对未来的研究工作提出了建议。 【英文文摘】The signification of autonomous mobile robotic archi- tecture is studied in this paper. Hierarchical architecture and subsumption architecture are the two kinds of robotic architec- tures being compared in detail. Based on this analysis, the peper gets the results that the hybrid architecture has advantages of both two types of architectures. Finally, the paper puts forward the hot topics in this area and make some suggestions about the future research

Study on the Model both Cutting Variable-speed of the Log-core Veneer Lathe and Moving Locus Model with Constant-speed Peeling

详细分析了无卡轴旋切机的工作原理,推导了旋切过程中刀刃进给速度与圆木直径的数学模型,同时得出旋切时间的近似计算式。从中可知,旋切过程中刀刃进给速度必须按一定规律变化才能保证旋切机正常工作。建立了旋切机恒线速旋切的运动轨迹模型,推导出旋切机恒线速旋切时间的精确计算式,并在此基础上提出了旋切时间简便的近似计算式。这些研究结果均可用于指导设计和进行实际生产。Working principle of log-core veneer lathe had been analyzed in detail,and the mathematical model between the knife-carriage feeding speed and the diameter of the log core was established,in the meantime,the approximation cutting time formula was also derived.The feeding speed must be changed with continuousness and a rule,which can let the lathe work well.Moving locus model of invariable-speed peeling was also founded,precision calculating formula of invariable-speed peeling was deduced.In the same time,the simplification cutting-speed formula was also derived.These results of the research will provide a guide for the designing and the producing practice

Research Progress on Extracellular Polymeric Substances of Marine Diatoms

近20年来,随着海洋科学研究的不断深入及一些海洋大项目(LOICZ,JGOFS)的实施,海洋生态学家在重新构建海洋食物网时发现,海洋藻类分泌的胞外多聚物(Extracellular Polymeric Substances,EPSs)是海洋碳的一个重要来源,它们可能直接参与海洋生态系统的碳循环、微食物环的组成、藻-菌及藻-藻的相互作用等过程,因而藻类胞外多聚物的研究引起了海洋学家的高度重视,成为当前海洋科学研究的一个热点。硅藻是海洋藻类中最重要的一大类群,也是海洋近岸水体中最主要的初级生产者,具有种类多、数量大、繁殖快等特点,在海洋生态系统的物质循环与能量流动中占有极其重要的地位。研究表明,许多硅藻(包括浮游硅藻和附着硅藻)在其生长过程中均能生产分泌胞外多聚物(EPSs),它是硅藻生命过程中不可或缺的一部分,在海洋生国家自然科学基金(39900020)资助;; 教育部青年骨干教师资

Influences of nutrient statuson extracellular carbohydrateproduction of marine planktonic diatoms

4种海洋浮游硅藻(牟勒氏角毛藻、海链藻、三角褐指藻和新月菱形藻)培养在改进的f/2培养基中,研究了不同氮、磷和硅营养水平对它们胞外多糖产量的影响.结果表明,硅藻胞外多糖的生产和释放具有种间特异性,角毛藻和海链藻胞外多糖的生产和释放主要在静止期,而三角褐指藻和新月菱形藻在指数生长期前期和静止期都能生产和分泌较高的胞外多糖;培养液中低浓度磷减少了4种硅藻在静止期胞外多糖的产量,但增加了角毛藻在生长期前期胞外多糖的产量;氮浓度的降低增加了三角褐指藻在指数生长前期胞外多糖的产量,但减少了其他3种藻类胞外多糖的产量;硅浓度的降低对4种硅藻胞外多糖的产量影响不大,在一定程度上还促进了静止期胞外多糖的生产.本研究表明,营养盐水平对硅藻胞外多糖生产的影响因种类和细胞所处生长期不同而存在着很大的差异.Four planktonic diatom species, Chaetoceros muelleri, Thalassiosira sp. , Phaeodac-tylum tricornutum and Nitzschia closterium , were cultured in modified f/2 medium, and the in-flue'nces of different levels of three nutrients, nitrate, phosphate and silicate on the production of extracellular carbohydrates were investigated. The results showed that production and release of extracellular carbohydrates were species specific, extracellular carbohydrates were produced mainly in the stationary phase of C. muelleri and Thalassiosira sp. , however, both in the early exponential phase and stationary phase in P. tricornutum and N. closterium. The decrease of phosphate concentration in the medium inhibited extracellular carbohydrate production in the stationary phase, however, lower phosphate concentration increased extracellular carbohydrate production in the early exponential phase of C. muelleri. Low concentration of nitrate increased extracellular carbohydrate production in early exponential phase of P. tricornutum and inhibited the production of other three species. The decrease of silicate concentration almost did not influence extracellular carbohydrate production in the four species and increased the production in the stationary phase to some degree. The results indicated that the influences of nutrient status on the extracellular carbohydrate production differed among the algal species and the growth phase.国家自然科学资助项目(39900020);教育部青年骨干教师资助项

MORPHOLOGY, FINE STRUCTURE AND CHEMICAL COMPOSITION OF EXTRACELLULAR POLYMERIC SUBSTANCES IN THREE MARINE DIATOM SPECIES

利用光镜和扫描电镜对厦门近海三种常见附着硅藻———爪哇曲壳藻亚缢变种(Achnanthesjavanicavar.subconstricta)、咖啡形双眉藻 (Amphoracoffeaeformis)和多枝舟形藻 (Nav icularamosissima)胞外多聚物 (Extracellularpolymericsubstances,EPSs)的形态和微细结构进行了研究 ,并初步分析了其化学组成。结果表明 ,A .javanicavar.subconstricta的胞外多聚物为透明的长柄 ,分为领、柄及垫状物三部分 ,电镜显示其微细结构为由许多纤维组成的双层实心管 ;Amphoracoffeaeformis分泌的EPS为由串连的小节组成的实心管状结构 ,许多管交织成厚的胶质块 ;Navicularamosissima的EPSs则为透明的薄膜并形成胶质膜。三种硅藻胞外多聚物的水溶性和水不溶性的主要成分均为多糖类 ,达总量的 70 %以上 ,蛋白质含量次之 ,不含脂类物质 ,但不同藻类EPS的组成差异较大。此外 ,还探讨了EPSs的功能及其分泌机理Extracellular polymeric substances (EPSs) of diatoms that exist in the form of stalks, apical pads, adhering films and fibrils, are a type of mucilaginous substance secreted in the exterior of cells. EPSs which play important roles in the life of diatoms in thier marine eco system. This paper investigated the morphology and detailed structure of EPSs in three marine diatoms, Achnanthes javanica var. subconstrict, Amphora coffeaeformis and Navicula ramosissima , isolated from the surface of seaweed collected in the Xiamen offshore. These samples were analyzed using microscope and scanning electronic microscope (SEM) methods. Their chemical compositions were also analyzed preliminary. The results showed that the morphology of EPS varied significantly among species with individual feature. EPS of A. javanica var. subconstricta has a long transparent stalk liked EPS, which usually lies on one end of cells and is composed of three parts: collar, stalk and pad. Cells of A. javanica var. subconstricta were attached to the surface of cultured vessel through the pad and many of the cells formed a cell line. The results from SEM showed that the close up of the EPS had a double layered solid tube structure made of fine fibers. Moreover, some cells have two or more stalks were observed under microscope. The EPS secreted by A. coffeaeformis was a solid tube, which is assembled by small tandemed segments with many interlaced tubes and gathered as colloid agglomeration, cell moved through the solid tubes and formed the lump. The EPS of N. ramosissima was a transparent and colloid mucous membrane, which covered on the surface of culture vessel and cells moved the membrane. There were many hollow cell hull liked membranes among of them, and spot veins were observed clearly. The preliminary results on EPS composition indicated that the compositions of both water soluble and water insoluble portions of EPS in the three diatoms were dominated by polysaccharides. Their contents exceeded 70% of total EPS, along with a small amount of protein, accounting for 3.2%—28% of total EPS. No lipid was found in the EPSs. Composition of polysaccharides and protein in EPSs varied greatly among different species, especially for the water insoluble portion: major composition of EPS in A. coffeaeformis was polysaccharides, up to 97% of total EPS content, protein content was very low, however the protein contents of EPS in A. javanica var. subconstricta and N. ramosissima were higher, 18.6% and 28% respectively. These data reflected different abilities in EPS production. The results indicate that the morphology of EPSs in different species are related to their habit, which is a result of long time adaptation, while chemical compositions of EPSs are species specific, which varies with species. The function of EPSs among species is different, which is determined by their structure and algal habit, stalks are apt to those life fixed species, tubes and membranes are apt to the motive species. Moreover, this paper also discuss the excretion mechanisms of EPSs in diatoms.国家自然科学基金资助项目 ;3990 0 0 2 0

CFD/CSD方法分析动力效应对民机气动特性影响

基于Reynolds average Navier-Stockes（RANS）的三维Navier-Stokes流场控制方程耦合结构静力学方程时域分析方法,研究了带有发动机的民用飞机其动力效应对全机气动性能的影响。首先采用数值方法对发动机进排气边界条件进行了模拟,分析了带动力的涡扇发动机模型的流场,并将计算结果与实验进行比较,验证边界条件处理的准确性;以此为基础,考虑结构弹性变形,采用计算流体动力学/计算结构动力学（CFD/CSD）耦合的方法,分别对通气和带动力的翼吊发动机全机的气动性能进行了研究。结果表明：基于通气构型预测的升阻力系数,气动载荷和压心位置与考虑动力效应后的计算结果存在明显不同。弹性变形又会加剧这一差异,使得全机的升阻比下降约12.6%,升力系数下降约8.9%,压心位置后移。数值算例显示,在靠近发动机区域气动载荷受动力效应影响显著,远离该区域,弹性变形效应占主要影响因素,因此在进行带动力效应的民机气动性能分析时,考虑弹性变形的影响是十分必要的