指纹识别技术在考试管理中的应用

指纹识别技术是一种成熟的生物识别技术，将指纹识别技术应用到考试管理中，通过指纹的唯一性和不可复制性，可有效杜绝考场上违法违纪现象的发生。介绍了指纹识别系统的选型、指纹识别系统的功能与特点以及软件设计的流程。     

基于ARM的无线指纹考务管理系统的设计及实现

基于ARM架构的嵌入式无线指纹考务管理系统内置指纹采集识别功能模块,采用无线网络通信和以太网通信结合的通信方式,与中央数据库保持软实时交换数据.系统采用Access数据库管理用户基本的常规信息和用户指纹特征信息数据,运行可靠;充分发挥嵌入式系统的特点,使用灵活方便.实验结果表明对指纹识别的拒识率低于1%,指纹识别的误识率接近0.系统可用于大规模考试管理,实用于远程网络化的考试管理,具有许多传统方法不能实现的功能,是考务管理的发展方向.     

基于指纹识别技术的考生身份验证系统的设计

本文设计了一种指纹IC卡考试系统.包括单片机控制部分的软、硬件实现,指纹IC卡部分的IC卡卡片原理及卡片结构,指纹识别部分中的指纹的采集、验证等.由于指纹的唯一性和不可复制性,使用该系统可杜绝考试中存在的替考现象,保证考生身份的真实性、可靠性和有效性,且节省人力,使用方便,便于考生信息的计算机管理.     

指纹认证在考试管理中的应用

针对考试替考、做假证件代考等作弊问题,提出将自动指纹识别技术应用到考试管理上,利用考生和管理人员的指纹特征值来判别其真实身份,设计出基于指纹认证的考试管理系统体系结构,并解决在研究的过程中所遇到的关键问题,最后对整个系统进行了实验研究,验证了该系统的可行性.     

智能指纹识别系统的设计

指纹识别是利用人体固有的指纹生理特征来进行个人身份鉴别的技术.由于人的指纹具有唯一性和不变性,所以指纹识别与传统的身份鉴别方法相比,具有更高的安全性和易用性.当今蓬勃发展的市场对指纹识别系统的便携性和易用性提出了更高的要求,指纹识别技术正向小型化和智能化的方向发展.本文阐述了智能指纹识别技术中各个步骤的核心技术,并介绍了一种以DSP芯片及FPS200指纹传感器为核心的智能指纹识别模块,描述了此系统的硬件设计.     

基于联合变换相关器的光电混合指纹识别技术

指纹识别具有很好的方便性和可靠性,是现代社会应用最广的生物特征识别技术.本文介绍指纹识别技术的发展和分类,论述了基于联合变换相关器的光电混合指纹识别技术,包括指纹取像技术与指纹预处理、指纹图像的匹配、系统的性能参数的定义以及光学联合变换相关器的各种改进方法,讨论了光电混合指纹识别技术的发展方向.     

智能指纹识别系统的设计

指纹识别是利用人体固有的指纹生理特征来进行个人身份鉴别的技术。由于人的指纹具有唯一性和不变性,所以指纹识别与传统的身份鉴别方法相比,具有更高的安全性和易用性。本文阐述了智能指纹识别技术中各个步骤的核心技术,并介绍了一种双DSP芯片OMAP及FPS200指纹传感器为核心的智能指纹识别模块,描述了此系统的硬件设计。     

低质量指纹图像的增强算法研究

研究指纹增强技术对于提高指纹特征提取的准确率乃至整个自动指纹识别系统都具有重要的意义。本文利用加博滤波具有良好带通滤波的特性,对指纹图像进行去噪处理,再使用纹线投票算法获取指纹图像的纹线结构,由此提取指纹图像的方向信息,并在此基础上对图像进行了增强处理。实验结果表明,指纹图像增强效果显著,可满足非实时性自动指纹识别系统的要求。     

论自动指纹识别技术在考试管理中的应用

针对在各类考试中做假证件替考的舞弊问题,有研究机构将自动指纹识别技术应用到考试管理上,利用考生的指纹特征值来鉴别其真实身份。本文通过对指纹识别技术在考试中的应用、特征及存在的优势与不足进行分析,并针对实际应用过程中出现的一些问题提出改进意见。     

基于ARM-Linux和SQLite的指纹车辆管理系统研究

基于ARM-Linux和SQLite嵌入式数据库,设计实现了一个指纹车辆管理系统.该系统在ARM-Linux平台上运行,采用指纹识别技术,管理和控制车辆进出小区.采用SQLite数据库,存取车主信息,车主指纹图像,车辆信息、车辆进出信息等.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the