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1.
Two-base numeration systems are introduced in the paper. They are generalizations of standard numeration systems, which are based on powers of a given radix. The results are reviewed and applications for encoding numbers and trees are given. Further research fields are outlined. A new parallel algorithm for modular exponentiation and new classes of prefix codes are presented.  相似文献   

2.
文章主要对元计算环境中任务调度进行了深入分析与研究。先概述了元计算系统对于科学领域的贡献,分析了元计算环境的特点;然后对元计算环境中的调度算法进行了分类说明,并对几种典型的调度算法行了具体的分析,评价了其特点与不足之处;最后分析了新兴的元计算环境—校园级元计算环境面临的挑战,借鉴各种调度算法,提出了与之相适应的任务调度策略,对其可行性进行了分析,并简要概括了其创新性。  相似文献   

3.
1 引言小波理论在图像压缩中已有成功的应用。在小波压缩系统中,有两个因素是至关重要的:一是小波滤波器,二是压缩编码算法。随着小波变换进入JPEG2000,与小波变换相配套的零树编码算法写进MPEG-4,小波理论在图像压缩中也占有越来越重要的地位。基于提升算法的第二代小波变换也日益受到研究者的广泛关注。与第一代小波变换相比,提升算法具有快速、高效的优点,并且提升滤波器的设计可直接在空域中完成。第一代小波变换可通过因数分解转换为提升方案,例如著名的Cohen和  相似文献   

4.
多传感器数据最优融合   总被引:2,自引:0,他引:2  
利用可信区间估计的概念,检验传感器测量值偏差,描述传感器间的支持关系,确定传感器数据的取舍,提出两种最优融合算法,仿真给果表明两种最优融合方法是有效的,其精度高于简单平均法。  相似文献   

5.
Data communications facilities are vital if essential banking operations are to be computerized; branches and head offices that are dependent upon terminals and corporate data to fulfil their functions must have access to such facilities. Back-up facilities are also essential if normal bank functions are not to be disrupted should a fault develop. Investigations that led to the installation of Hyperchannel at the Royal Bank of Scotland are described and the problems to which Hyperchannel provided the solutions are examined. The implementation of the system and plans for future development are discussed.  相似文献   

6.
知识库的异常是影响整个知识系统性能的重要因素之一,因此必须对获取的知识进行校验。本文综述了知识库异常检测和验证的相关研究,给出了异常知识的分类及其危害性,分析了知识库验证困难的原因,介绍了用于知识库验证的静态和动态方法,列举了国际上几个著名的知识库验证工具,并对知识库验证的研究进行了展望。  相似文献   

7.
The fundamentals of hierarchical data structures are reviewed and it is shown how they are used in the implementation of some basic operations in computer graphics. The properties of hierarchical structures are discussed, focusing on quadtrees and octrees. The latter are defined, some of the more common ways in which they are implemented are examined, and an explanation of the quadtree/octree complexity theorem is provided. Vector quadtrees and vector octrees are discussed. The performance of basic operations using quadtrees is considered  相似文献   

8.
基于FPGA及FLASH的数据采集存储系统设计   总被引:1,自引:0,他引:1  
提出了一种多路数据采集存储系统的设计方法。介绍了闪存和现场可编程门阵列FPGA的功能特性,并利用外围接口电路及上述芯片设计并实现数据采集存储系统。介绍并口EPP模式控制的读数操作过程。给出了采集存储系统的接口电路,并阐述了它的实现原理。  相似文献   

9.
基于粘贴模型的巨大并行性,分别给出了线性全排列和圆周全排列问题的粘贴DNA算法;分析了两类问题的DNA算法的不同之处;通过一个实例给出了实验操作步骤,并对生化实验进行了模拟,得出了正确的结果,从而证明了算法的可行性。最后,对算法的操作复杂度进行了分析。  相似文献   

10.
Park  C.Y. Shaw  A.C. 《Computer》1991,24(5):48-57
Analytic methods are employed at the source-language level, using formal timing schema that include control costs, handle interferences such as interrupts, and produce guaranteed best- and worst-case bounds. The timing tool computes the deterministic execution times for programs that are written in a subset of C and run on a bare machine. Two versions of the tool were written, using two granularity extremes for the atomic elements of the timing schema. All overview of the tool is given, timing schema and code prediction are discussed, and machine analysis and timing tool design are examined. Experimental and validation results are reported. It was found that all the predicted times are consistent, and most are safe. Some predictions are fairly tight, while others are a little loose. There are clear technical reasons that explain the differences between measured and predicted times, and technical solutions that should minimize these differences within the timing schema framework are seen  相似文献   

11.
引入了扰动模糊有限转换状态机和扰动模糊有限状态机的(强)同态的概念,研究了它们的相关性质。给出了[Σ]的元素构成所有长度有限的词集上的两种同余关系,讨论商结构问题,证明了相应的所有等价类构成具有单位元的有限半群,并且这两个有限半群是同态的。给出了[Q]上容许关系及强同态的核的概念,研究了它们的相关性质。  相似文献   

12.
磁盘加密模式分析   总被引:1,自引:1,他引:0       下载免费PDF全文
基于国内外磁盘加密产品的研究成果,通过跟踪IEEE存储安全工作组(SISWG)制定的块存储设备加密标准P1619,分析磁盘加密的特定需求,指出其在国内研究的欠缺。选取目前主流的加密模式进行安全性分析,根据其在应用中的优缺点,给出相应建议,并总结磁盘加密算法研究的发展方向。  相似文献   

13.
本文综述了生物/化学微传感器的技术和应用,详细描述了起源于半导体技术的标准工艺流程和制造三维机械结构的特殊微细机加工工艺,给出了基本化学传感器原理和对应的化学/生物传感器应用实例,最后提出了单片集成化学/生物微传感器系统,包括单一芯片上传感器结构和运转电路。  相似文献   

14.
无线传感器网络1点和2点连通可靠性研究   总被引:12,自引:4,他引:8  
无线传感器网络集成了传感器、微机械电子和网络通讯技术,它的巨大应用前景引起了军事部门、工业界和学术界的广泛关注.它的节点不是预先安置,而是随机撒放,那么就有问题:在假定每个传感器节点通讯半径一定,一个固定区域要抛撒多少节点才能保证这些节点组织的网络基本连通?要抛撒多少节点才能保证满足2点间的连通可靠性.本文进行了大量的计算机模拟试验,采用了随机抛撒节点,然后进行连通度测试的方法,给出了节点数、通讯半径和连通关系的曲线簇.通过对曲线簇的对数变换和对变换后曲线簇的回归分析,给出了仿真区间内的单点连通和二点连通的经验公式,取得了满意的效果.给出了通过几何变换可能推广任意通讯半径的方法.本文同时给出了在仿真中的重要参数:随机抛撒均匀分布的节点的邻居节点的分布规律,抛撒后节点满足通讯半径要求建立的连接数的分布规律.这些直接指导无线传感器网络的节点个数和通讯半径选择,连通可靠性设计.  相似文献   

15.
Comparison of thinning algorithms on a parallel processor   总被引:1,自引:0,他引:1  
A number of parallel algorithms for thinning elongated shapes are contrasted and compared on a Clip 4 parallel processor. These algorithms all work in rectangular tessellation and they thin elongated objects to lines one pixel thick while retaining their connectivity. Existing algorithms for use on binary pictures are considered first and new algorithms are proposed which produce more satisfactory results, but are more expensive in terms of speed and space requirements. Two methods of extending these algorithms to grey pictures are then considered. In one method, binary algorithms are used but are directed by the grey pixels; in the other the binary algorithms are generalized to the grey case. Both methods result in arcs which are not wholly determined by the original boundary of the object but lie along darker ridges. The former is faster and produces results which are easier to interpret, but the results from the latter contain more information.  相似文献   

16.
基于贝叶斯滤波理论的自主机器人自定位方法研究   总被引:2,自引:0,他引:2  
针对自主机器人定位问题,研究了基于贝叶斯滤波理论的自定位方法,从概率表达的角度介绍了贝叶斯滤波方法各种不同的实现形式,分析了各种不同定位方法的性能,指出了它们的优缺点,并对每种方法的改进方法进行了探讨和分析,最后总结了定位方法的基本特点,并对贝叶斯滤波理论在自主机器人领域中的应用前景进行了展望,探讨了未来的发展方向。  相似文献   

17.
A class of simplified background neural networks model with a large number of neurons is proposed. Continuous attractors of the simplified model are studied in this paper. It contains: (1) When the background inputs are set to zero and the excitatory connections are in Gaussian shape, continuous attractors of the new network are obtained under some condition. (2) When the background inputs are nonzero and the excitatory connections are still in Gaussian shape, continuous attractors are achieved under some appropriately selected condition. (3) Discussions and examples are used to illustrate the theories developed.  相似文献   

18.
阐述了温度无线传感技术在热防护系统健康监测中应用的发展与现状;概括地阐明了被动式SensorTag这种无线微传感装置的工作原理和特点,分析了该装置在高温下的工作能力和设计方面存在的问题;总结了主动式无线传感装置的发展与试验测试,比较分析了被动式和主动式无线传感装置的相同点和不同点,指出了各自的优点和不足,并总结了高温无线温度微传感装置今后努力的方向。  相似文献   

19.
数字喷泉码和网络编码都是提高网络传输效率的有效技术方法,两者的有机结合形成的网络喷泉码具有重要的理论意义和应用价值。本文首先对数字喷泉码的最新研究进展进行了综述,分别介绍了几类常见的数字喷泉码的相关研究工作;其次对当前网络喷泉码的研究现状进行了系统的总结,重点介绍了同构网络喷泉码、异构网络喷泉码和无线网络喷泉码的相关理论及其最新研究成果,并分析了研究中存在的问题;最后对网络喷泉码的相关理论及其应用的发展趋势进行了分析和展望。  相似文献   

20.
传统的计算视觉测量方法,普遍存在图像特征提取困难,非线性,求解过程复杂的问题。针对这种情况,讨论了一种基于正交优化的线性视觉测量方法,即利用霍夫变换提取图像中的直线,再利用对应直线列解线性方程,最后对解矩阵进行正交优化。它具有求解简单,容易操作的特点,且对误差具有鲁棒性。最后针对不同旋转角度进行了大量实验测量,证明了方法的可靠性。  相似文献   

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