储蓄凭条中手写体的提取与净化系统

给出了储蓄凭条手写体提取系统的设计与实现,包括预处理,建立模板,基线定位与去除,倾斜校正 处理,定位格去除和手写体净化分割等。重点讲述了图像二值化,手写体分割与净化算法。     

A complete sequence and comparative analysis of a SARS-associated virus(Isolate BJ01)

Severe Acute Respiratory Syndrome (SARS) is a newly identified infectious disease[1—5]. The global outbreak of SARS has been threatening the health of people worldwide and has killed 353 people and infected more than 5462 in 27 countries, as reported by WHO on April 29, 2003 (http://www.who.int/csr/sarscountry/en). Although it has been recognized that a variant of virus from the family of coronavirus might be the candidate pathogen of SARS[1—5], its identity as the unique pathogen sti…     

Compact difference approximation with consistent boundary condition

For simulating multi-scale complex flow fields it should be noted that all the physical quantities we are interested in must be simulated well. With limitation of the computer resources it is preferred to use high order accurate difference schemes. Because of their high accuracy and small stencil of grid points computational fluid dynamics (CFD) workers pay more attention to compact schemes recently. For simulating the complex flow fields the treatment of boundary conditions at the far field boundary points and near far field boundary points is very important. According to authors' experience and published results some aspects of boundary condition treatment for far field boundary are presented, and the emphasis is on treatment of boundary conditions for the upwind compact schemes. The consistent treatment of boundary conditions at the near boundary points is also discussed. At the end of the paper are given some numerical examples. The computed results with presented method are satisfactory.     

松辽盆地南部海坨子地区油气成藏研究

松辽盆地南部海坨子地区扶余油层与萨尔图油层中有机包裹体有较大差异。扶余油层中有机包裹体量多 ,个体大 ,早期和晚期有机包裹体发出强的黄色荧光 ;萨尔图油层有机包裹体丰度不高 ,个体都较小 ,早期和晚期有机包裹体发出弱的浅黄色荧光。这说明萨尔图油层的烃类成熟度比扶余油层的烃类成熟度高。海坨子构造主要发生过两次成藏过程 ,早期在嫩江期末 ,晚期发生在明水期末至第三纪。扶余油层和萨尔图油层的油气来源不同 ,前者油气主要来自海坨子构造青一段烃源岩 ,后者主要来自乾安凹陷青山口组烃源岩。     

会计学专业实践性教学模式的探讨

知识经济时代 ,对会计人员的素质要求越来越高。文章主要探讨如何加强会计专业实践性教学环节 ,寻求有效的实践性教学模式 ,从而培养出具有熟练会计核算能力、利用会计资料进行会计监督、参与企业经营管理预测和决策能力的会计人才     

Identification and mapping of quantitative trait loci controlling cold-tolerance of Chinese common wild rice (O. rufipogon Griff.) at booting to flowering stages

Cold injury is an important limitation of rice production. Therefore, screening for cold-tolerant genetic resources and the development of highly cold-tolerant cultivars is crucial for higher yield potential and stable yield of rice. There have been several reports on the genetic analysis and QTL mapping of the cold-tolerance at the booting stage. Toriyama et al.[1,2] and Futsuhara et al.[3,4] reported that 4 or more genes were involved in the cold-tolerance. Several QTLs at the booting sta…     

李群G在流形M上左作用的相关性质

本通过李群G在流形M上左作用，构造了M上单参数可微变换群，证明了其诱导向量场与李代数g之间存在同态映射，且诱导向量场是—李代数。     

参数不确定广义系统的鲁棒H∞控制

研究了一类具参数不确定性广义系统的鲁棒H∞ 控制问题 .基于线性矩阵不等式 (LMI)方法 ,给出了控制输入为零时不确定广义系统具H∞ 范数界的稳定性分析 ;在此基础上 ,建立了鲁棒H∞ 状态反馈控制律的设计方法 .在一定条件下 ,该方法使不确定广义系统对所有容许的不确定参数 ,相应的闭环系统是正则、无脉冲且稳定的 ,并具H∞ 范数界 .数值例子验证了该设计方法的有效性     

基于H.323的数字化语音教室学生终端

设计了数字化语音教室学生终端的解决方案，分析了硬件双核结构的特点，结合CPU两个内核不同的体系结构，在DSP内核上连接A／D，D／A模块实现语音信号I／O通道以及实时实现语音编解码算法，在ARM内核上移植了μC／OS－Ⅱ嵌入式操作系统，H．323应用系统、键盘，显示器等用户接口模块均由μC／OS－Ⅱ统一管理和调度，语音终端综合应用了嵌入式软件设计技术，多媒体技术，计算机微处理器技术和网络技术，也可以作为Internet网络多革体终端的基础。     

基于普通编码器的高精度位置检测方法

根据普通增量式光电编码器测量转角位置的原理，分析了量化误差的形成原因和编码器脉宽制造误差对测量精度的影响，提出了新的信号处理算法——脉冲细分法，利用该方法减小了量化误差．同时标定出编码器的脉宽系数井以它作为脉宽制造误差的补偿参数，消除对位置测量造成的影响，最终提高了系统的测量精度．