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Search Results: 1 - 10 of 2313 matches for " 费军旗 "
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三圈图的最小离心距离指标
军旗,涂建华
- , 2018, DOI: 10.13543/j.bhxbzr.2018.01.018
Abstract: 为进一步研究离心距离指标(EDS)数学性质,通过研究3种移边变换对离心距离指标的影响,利用移边变换和数学归纳得出了三圈图离心距离指标的最小值及其对应图的结构。本文方法为研究更一般图的离心距离指标提供了一种简单有效的思路。
Abstract:The eccentric distance sum (EDS) has been widely used in the fields of chemistry and biology. In order to study its mathematical properties further, a new method has been used in this paper. Firstly, three transformations of edge-grafting on the eccentricity distance sum of a connected graph were studied. Then by using these transformations and induction, we obtained the minimum eccentric distance sum among all tricyclic graphs with order n, and also characterized the structure of the corresponding tricyclic graphs. The results demonstrate that our method is simple and effective, and offers a new way of studying the eccentric distance sum of general graphs.
双筒流变仪中Maxwell流体的振颤周期
军旗
力学与实践 , 1995, DOI: 10.6052/1000-0992-1995-074
Abstract: 本文对在用双筒流变仪测定Maxwell流体的物性常数时,对所寻出的解析解进行理论分析,比较了数值试验与理论结果,两者吻合甚好,在测试工作中,只要获得振颤周期,就可以获得黏弹性常数,从而导出松弛时间。
肾炎灵治疗慢性肾炎65例
军旗
中国中医药信息杂志 , 2003,
Abstract:
本原可分rpp半群
Primitively Decomposable rpp Semigroups
 [PDF]

邱小伟, 郭小江,军旗, 吴瑕
Pure Mathematics (PM) , 2012, DOI: 10.12677/PM.2012.24039
Abstract: 完全0-单半群是一类非常重要的正则半群,也是正则半群结构基础。本原可分rpp半群是完全0-单半群在rpp半群理论中推广。本文主要研究本原可分rpp半群,给出了这类半群的若干特征,并证明了:半群为本原可分rpp半群当且仅当它是满足一些条件的左消幺半群上的Rees矩阵半群的同态像。此外,还研究了若干特类。
Completely 0-simple semigroup is a very important class of regular semigroups, and its also the basis for the structure of regular semigroups. Primitively decomposable rpp semigroups are generalizations of completely 0-simple semigroups in the range of rpp semigroups. In this paper, the author studied primitively decomposable rpp semigroups, gave some characterizations for these semigroups and proved that a semigroup S was primitively decomposable rpp semigroup if and only if it was a homomorphic image of Rees matrix semigroup over a left cancellative monoid satisfying some conditions. In addition, some special primitively decomposable rpp semigroups were considered and discussed.
基于小波变换的多分辨率分析分割算法的研究
The Multi-Resolution Analysis Segmentation Research Based on Wavelet
 [PDF]

洪亮
Hans Journal of Data Mining (HJDM) , 2012, DOI: 10.12677/hjdm.2012.22003
Abstract: 跳频信号以其自身优良的抗截获、抗干扰能力,在军事通信中得到了广泛的应用,因此,对跳频信号的截获展开研究具有非常重要的现实意义。本文采用时频联合分析的方法,深入研究了跳频信号在线自动盲检测和频点搜索捕获问题,并对其特征参数提取算法进行了研究。针对跳频信号的特征提取,研究了一种基于小波脊线的特征提取算法,通过matlab仿真实验对方法的性能进行了验证,实验表明基于小波脊线的特征提取算法有很大的性能优势,进一步提高了频率估计的准确性和时效。
Frequency hopping signals in their own excellent anti-interception, anti-interference ability, in the military communication has been widely applied, therefore, it has a very important practical significance for the research of interceptting the frequency hopping signals. In this paper, the joint time-frequency analysis, in-depth study of the frequency hopping signal line automatic detection and frequency blind search acquisition issues, and its feature extraction algorithm is studied. Frequency hopping signals for feature extraction of a feature based on wavelet ridge extraction algorithm, the matlab simulation results the performance of the method was validated by experimental results show that the characteristics of wavelet ridge extraction algorithm is very performance advantages, and further improve the frequency estimation accuracy and timeliness.
为鼓励具有创新的基础研究,全面改革基础研究的管理模式
史培军,军旗
地球科学进展 , 1994, DOI: 10.11867/j.issn.1001-8166.1994.05.0098
Abstract:
超声速多喷流干扰流场特性研究
军旗李素循
力学学报 , 2009, DOI: 10.6052/0459-1879-2009-4-2008-286
Abstract: 研究了旋成体上超声速来流与超声速横向多喷流相撞产生的层流干扰流场特性.数值方法针对三维可压缩Navier-Stokes方程按二阶精度Roe格式进行离散,采用基于多区对接网格技术的有限体积法.数值模拟结果描述了多喷流干扰流场的空间结构以及激波/边界层干扰引起的分离范围,探讨了沿流向等间距排列的喷口个数对表面和空间流场结构以及压力分布的影响规律.结果表明,第一喷口对多喷流干扰流场主要结构和喷口上游表面分离范围起主导作用.其中三喷流流场数值模拟的对称面激波结构与实验纹影结果进行对比,符合较好.
微结构孔隙介质的球对称弥散问题及其解
军旗,刘慈群
力学学报 , 1993, DOI: 10.6052/0459-1879-1993-3-1995-646
Abstract: 本文研究球对称弥散问题,模型中考虑了孔隙介质的微结构特征。这种微结构起着广义的吸附作用,在溶质的输运过程中有滞后效应。文中考虑了五种微结构模型,它们是均衡吸附模型,一阶线性动力吸附模型、板状、柱状和球粒结构模型。分别求得Laplace空间的解析解,用Stehfest的数值反演技术获得各种模型的溶质浓度分布,并对有关的影响因素进行了量值考查,对认识微结构模型的特性有帮助,可以作为地层排污、特殊条件下的石油开采及溶滤萃矿等工程设计的理论依据。
活血散肿丹治疗脑出血的临床观察
刘继东,军旗
中国中医药信息杂志 , 2001,
Abstract:
基于查询采样的高维数据混合索引
军旗,周向东?,施伯乐?
软件学报 , 2008,
Abstract: 为了改进高维数据库查询的效率,通常需要根据数据分布来选择合适的索引策略.然而,经典的分布模型难以解决实际应用中图像、视频等高维数据复杂的分布估计问题.提出一种基于查询采样进行数据分布估计的方法,并在此基础上提出了一种支持最近邻查询的混合索引,即针对多媒体数据分布的不均匀性,自适应地对不同分布的数据使用不同的索引结构,建立统一的索引结构.为了实现混合索引,采用构造性方法:首先通过聚类分解分割数据并建立树状索引;然后使用查询采样算法,对数据实际分布进行估计;最后根据数据分布的特性,把稀疏数据从树状索引中剪裁出来,进行基于顺序扫描策略的索引,而分布比较密集的数据仍然保留在树状索引中.在4个真实的图像数据集上进行了充分的实验,结果显示,该索引方法明显优于idistance,m-tree等度量空间索引,在维数达到336时,查询效率仍高于顺序扫描.实验结果显示,该查询采样算法在采样数据量仅为(n为数据量)的情况下即可获得满足索引需要的分布估计结果.
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