基于概率速度场的实时船舶检测

为了准确及时获取船舶在船闸中的运动信息,提出了一种基于概率速度场的实时检测船闸中船舶的方法。该方法首先分析了船舶在船闸中运行的各种环境因素;其次为了消除和减弱阴影和光斑的影响,从监测图象灰度直方图中派生出一个高斯概率分布模型,进而获取图象的概率场;最后定义了一个基于光流计算的可实时检测船舶的概率速度场。该方法已成功地测试了大量通过三峡临时船闸和葛洲坝船闸的船舶序列图象。     

嵌入式Web Server技术在工业控制领域的应用

嵌入式Web Server(Embedded Web Server,EWS)技术是网络技术、Web技术和嵌入式技术相结合的产物。EWS系统与传统的Web应用系统相比,大大简化了系统的结构,并将信息采集和信息发布都集成到现场的测控设备中。EWS系统通过Web和嵌入式技术使接入Internet的各种设备或其它类型的子网具有远程监控、诊断和管理的功能。因此,嵌入式Web Server技术得以推广,并广泛应用于工业控制领域。     

Optoelectronic device for reading of hidden magnetic information from the holograms

The model of the device of reading (visualization) of the hidden magnetic information from the holograms combined with magneto-optical layer is presented in the article. Ways of magnetic images formation on the protected documentation and their reading by magneto-optical methods are proposed. The reading head with the help of magneto-optical meridional Kerr effect allows to observe visually of “effect of blinking” from the hologram with the hidden magnetic layer. During the work the mathematical analysis magneto-optical Kerr or Faraday effects was carried out. The hidden magnetic image based on:

Self-orienting wireless multimedia sensor networks for occlusion-free viewpoints

Wireless multimedia sensor networks (WMSN) are formations of a large number of compact form-factor computing devices that can capture multimedia content, such as video and audio, and communicate them over wireless channels. The efficiency of a WMSN heavily depends on the correct orientation (i.e., view) of its individual sensory units in the field. In this paper, we study the problem of self-orientation in WMSN, that is finding the most beneficial orientation for all multimedia sensors to maximize multimedia coverage. We propose a new algorithm to determine a node’s multimedia coverage and find the sensor orientation that minimizes the negative effect of occlusions and overlapping regions in the sensing field. Our approach enables multimedia sensor nodes to compute their directional coverage leading to an efficient and self-configurable sensor orientation calculation. By using simulations, we show that the occlusion-free viewpoint approach increases the multimedia coverage significantly. The self-orientation methodology is designed in the form of a distributed algorithm, making it a suitable candidate for deployment in practical systems.     

深海集矿机模型车避障系统设计

考虑深海底集矿机的未知、复杂工作环境以及在集矿机上做试验的不便,设计并实现了深海集矿机模型车避障系统;该系统先用超声波传感器检测障碍物信息,然后用高性能单片机AT89S52对信息进行处理后传送到水下工控机,在此基础上,运用改进势场法进行行走避障,规划出深海集矿机模型车作业路径;此算法适应于动态未知复杂环境下的深海集矿机实时导航和避障,且在目标点附近存在障碍物时也能达到目标;仿真和试验结果验证了该算法的有效性。     

带锥敏感薄膜形变特性有限元仿真

在一种新的基于真空二极管原理的场发射压力传感器中 ,阴极发射尖锥体和敏感薄膜制备于同一硅片上 ,从而简化了传感器的封装工艺 ,但因此可能导致传感器灵敏度的减小。利用有限元仿真技术 ,计算了在外部压力作用下 ,几何形状比较复杂的带尖锥体敏感薄膜的横向挠度形变特性。计算结果表明 ,与不带尖锥体的敏感薄膜相比较 ,带尖锥体敏感薄膜在额定外部静压力作用下的最大横向挠度的减小量小于 0 .4% ,因此对传感器灵敏度的影响可以忽略不计     

可用于人脸识别的反馈型二元神经网络

提出和分析了一种新型的反馈型随机神经网络,并将其用于解决复杂的人脸识别问题.该模型采用随机型加权联接,神经元为简单的非线性处理单元.理论分析揭示该网络模型存在唯一的收敛平稳概率分布,当网络中神经元个数较多时,平稳概率分布逼近于Boltzmann-Gibbs分布,网络模型与马尔可夫随机场之间存在密切关系.在设计了一种新型模拟退火和渐进式Boltzmann学习算法后,系统被成功地应用于难度较大的静态和动态人像识别,实验结果证实了系统的可行性和高效率.     

Gröbner bases with respect to several orderings and multivariable dimension polynomials

Let D=K[X]$D=K\left[X\right]$ be a ring of Ore polynomials over a field K$K$ and let a partition of the set of indeterminates into p$p$ disjoint subsets be fixed. Considering D$D$ as a filtered ring with the natural p$p$-dimensional filtration, we introduce a special type of reduction in a free D$D$-module and develop the corresponding Gröbner basis technique (in particular, we obtain a generalization of the Buchberger Algorithm). Using such a modification of the Gröbner basis method, we prove the existence of a Hilbert-type dimension polynomial in p$p$ variables associated with a finitely generated filtered D$D$-module, give a method of computation and describe invariants of such a polynomial. The results obtained are applied in differential algebra where the classical theorems on differential dimension polynomials are generalized to the case of differential structures with several basic sets of derivation operators.     

基于F2上遍历矩阵的Shamir三次传递协议的实现

给出了Shamir三次传递协议的一种新的实现方案.与已有的基于离散对数问题的实现方案不同,它是基于在特定的非交换壹半群(m,·)中,由A和B＝x·A·y求解x和y的难度;为此我们选取有限域F2上的n×n矩阵在F2矩阵乘法下所构成的非交换壹半群作为研究的对象,利用F2上"遍历矩阵"的密码学特性,提出了一个基于F2上遍历矩阵的Shamir三次传递协议的实现方案,并对可能的攻击手段进行了分析.为了增加通讯的安全性,提出了"强壮矩阵"的概念,并对于给定的两个遍历矩阵Q1和Q2,给出了关于Q1,Q2的强壮矩阵的判别标准和寻找算法;利用<Q1>,<Q2>以及关于Q1,Q2的强壮矩阵m,可以构造一个单向(陷门)函数,基于该单向函数,可具体实现Shamir三次传递协议、Diffie-Hellman密钥交换协议以及常规的公钥密码.     

基于FF功能块的过程控制系统优化

本文对FF现场总线标准的功能块及其结构进行了介绍,并从提高控制的分散性和安全性着手,分析了基于功能块的过程控制系统的优化方法.