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1.
优势决策信息系统规则获取方法及应用   总被引:3,自引:1,他引:2  
鉴于已有优势决策信息系统规则获取方法存在不足,如得到规则较少、规则正确率不高等,定义优势决策辨识集和辨识矩阵,给出优势决策信息系统的属性约简方法;引入基于优势关系的粗糙集方法将对象进行优劣排序,并结合决策属性剔除不合理对象,将不协调优势决策信息系统转化为协调优势决策信息系统;提出协调优势决策信息系统的规则获取方法,该方法符合自然推理过程,直观性强,在充分挖掘系统蕴含信息的基础上,保证了规则的正确性;将该规则获取方法应用于雷达对抗目标威胁评估简单可行,并为解决属性含有"偏好信息"的决策问题提供了新的思路。  相似文献   

2.
魏世孝 《兵工学报》1990,11(1):58-65
本文给出一种定性定相结合的求解多属性决策问题的算法-加权优序法,证明了算法的收敛性。它广泛适用于管理和工程技术中对离散方案进行优选、排序的一类决策问题。有助于减少因决策目的多目标性,和属性与方案关系的不分明性造成的困难。  相似文献   

3.
针对传统的粗糙集模型不能有效处理具有动态特性的偏好信息系统这一缺陷,文中提出双向S-优势粗集模型.首先在双向S-粗集的基础上,引入优势关系,并将两者结合建立了基于优势关系的双向S-粗集模型.然后对该模型的性质以及该模型与优势粗糙集模型之间存在的关系进行了研究.最后通过在实例中对该模型的应用,表明该模型可成功应用于战场对敌意图识别问题.  相似文献   

4.
基于粗集理论的规则知识获取   总被引:5,自引:0,他引:5  
粗集理论是处理不完整数据和不精确、不确定性问题的理论.基于粗集理论,分析实到诊断数据,获取诊断规则知识.它将要处理的问题表达为知识表达系统,由条件和决策属性的依赖关系消去冗余条件属性,根据属性取非正常值的数目决定其重要性束决定冗余属性取舍。通过计算各规则的核值获取系统的简化属性核值表,采用规则优化得到简化规则集,在简化属性核值表中取值次数的多少决定规则选取的优先次序.并以武器系统中某设备模块的一组实到故障诊断数据为例,具体说明了诊断规则知识的获取过程。  相似文献   

5.
将数据融合领域的D-S证据推理理论应用于空袭目标威胁程度的评估.先针对各决策者关于相应方案在某属性上的评语集,利用证据组合公式进行信息融合,形成该方案在属性上的群体偏好信息,接着求出关于该方案在属性上的确定性评价值,最后针对得到的确定性多属性决策问题,利用加权法或理想点法进一步对方案进行最终的排序.  相似文献   

6.
自行火炮作战效能评估一般会利用AHP以及多属性效用等有效方法。AHP能够充分利用专家的主观意见,但是难以排除人为因素带来的主观偏差的问题;多属性效用方法不受人为因素影响,且能够充分运用武器的具体参数,但难以反映评估专家的偏好,也无法判断评估对象各指标的相对重要性的问题。针对以上问题,提出了一种基于AHP和多属性效用结合的评估方法。该方法有效结合AHP与多属性效用方法的优势,实现了评估时主观数据和客观数据的有机统一,减小了评估偏差。通过对自行火炮作战效能进行实例分析,并分析验证了该方法的科学性与合理性。  相似文献   

7.
田恒  许荣滨  姜艳红  张文虎  邓四二 《兵工学报》2022,43(12):3240-3246
针对传统离散粒子群优化(PSO)算法仅能搜索多值属性系统(MVAS)最小完备测试集的问题,通过重塑离散PSO算法,提出一种测试序列寻优算法—PSO-测试(TS)算法。在多值D矩阵和五元组的基础上,公式化处理MVAS的诊断策略。重塑离散粒子群的过程,将离散PSO算法与MVAS的故障诊断策略融合。设置PSO-TS算法的自身认知和社会知识阶段的计算规则,并通过引入交换序提升PSO-TS算法中粒子的多样性。采用实例和随机仿真实验验证PSO-TS算法。研究结果表明:与MV-Rollout和MV-IG算法相比,PSO-TS算法的期望测试费用少,能够获得较优的诊断策略,但是运行时间较长。  相似文献   

8.
为提高装备故障诊断效率,提出了一种新的粗糙集属性约简方法.首先将属性约简问题转化为集合覆盖问题,在相关矩阵的基础上构建相关系数矩阵;然后基于优质特征集选取原则,引入随机变异机制,设计扰动搜索算法,求出属性约简结果;最后,用UCI数据集和某型复杂装备电源系统进行验证.仿真结果表明,在满足分类精度要求的基础上,有效剔除了冗余属性,缩短了故障诊断时间.  相似文献   

9.
把粗糙集理论与基于概率统计ID3算法结合建立粗糙集约简模型,可处理不精确扣模糊数据集信息,多维属性元组组成的粗糙集数据可用公式描述论域、有限属性、条件属性、决策属性、属性值集扣信息函数,用数据表格描述对象以建立知识表达系统,粗糙集分类约简用ID3算法可消除冗余数据集扣冲突检测,用粗糙集理论处理不一致扣不确定数据集可得到知识等价类,通过ID3算法对比决策树,可导出数据集确定性规则扣不确定性约简规则。  相似文献   

10.
针对确定备件品种不完备信息的多属性决策问题,给出了基于不完备信息系统的粗糙集模型,并依据扩展优势关系确定粗糙集的上、下近似集,从而获取分类决策规则;用一个实例说明该方法的可行性和有效性.  相似文献   

11.
Tetraacetyldibenzylhitane (TADBIW) was subjected to debenzylation by nitrosating with inorganic materials available commercially to synthesize tetraacetyldinitrosohexaazaisowurtzitane (TADNSIW). TADNSIW was purified, and its structure was determined by FTIR, 1H NMR, MS and element analysis. The debenzylation reaction of TADBIW gave quantitative benzaldehyde as a by-product. This indicates that the reaction produces an imine cation as an intermediate. Hexanitrohexaazaisowurtzitane (HNIW) was prepared from unpurified TADNSIW with the yield over 96.0 % and the purity more than 98.0 %. And the mechanism of the reaction from TADNSIW to HNIW is proposed to be oxidation of nitroso and nitration of acetyl on the molecule of TADNSIW, This reaction system involved is simple, and the reaction can complete within a short time and under mild conditions. The product can be easily to separate and the waste disposed readily.  相似文献   

12.
The technique of watermarking has been introduced into 2D vector maps for many potential applications such as protecting the copyright of important GIS (geographical information system) data and tracing the data source of military maps. In most previous works, although the validity of the map data could be preserved during the embedding procedure, the shape-distortions of the map elements are usually neglected which would tend to degrade the invisibility of the watermarking schemes. A shape-preserving algorithm for watermarking 2D vector maps is presented in this paper. A 1D distance sequence extracted from the original map is adopted as the cover data instead of 2D coordinates. A watermark bit is represented by changing the distributions of the cover data. The embedding procedure induces lower shape-distortions than in former works. Experimental results indicate better invisibility of the proposed scheme, as well as its robustness to certain attacks such as map simplification, interpolation, additive noise and most geometric transforms.  相似文献   

13.
By analyzing the influencing factors of part quality making of sheet alloy of titanium by vibra cutter, the shape of upper reamer is set as cylinder and wedge-shaped form, and the lower reamer as plain and hemicycle form, and its main structural parameters are defined as well. Then it is validated further that such improved vibra cutter reamer can be used to process curve-edged parts of titanium alloy sheet. The experimental result shows that the titanium alloy sheet parts processed by above equipment have no sharpen angles for convex parts and evident crevasse of concave-edged part. In summary, such improvement can eliminate the free-waved edge and improve the manufacture quality of titanium alloy sheet parts greatly.  相似文献   

14.
The initiating behavior of fine-grained explosives by small flyer is studied. The diameter of small flyer in this device is 1 ram. The test results indicate that the granularity of explosives has great effect on its flyer initiating sensitivity.The flyer initiating sensitivity of the fine-grained explosives is higher and the critical initiating energy is lower than that of common explosives. For common explosive, the flyer initiating sensitivity increases as the density is reduced. But for the fine-grained explosive, the test results are exactly opposite.  相似文献   

15.
Open rule-setting method advanced in this paper concentrates on providing designers of engines with a convenient way to express their design innovations and develop the expected prototypes in the early CAD stage, and constitute effective models for the following analysis process of CAE and CAPP. The problems arisen in the process of conceptual design with the traditional experience-based development method are analyzed. Based on those analyses, open rule-setting method is presented and some associated technical problems are discussed. The functional framework of open rule-setting system was built as software engineering methods. The speciality of the engine product as a kind of complex product and the requirement of the engine product based on its structural particularity to rule-setting system are considered carefully. A demonstration is supplied to illustrate how the open rule-setting method enhances the efficiency and quality of the engine conceptual design.  相似文献   

16.
By analyzing the working principle of Linux network device driver, discussing the Linux network driver structure and its key technologies, the general network driver structure and its design methodologies in Linux system are summarized. Through modifying the network device driver of Linux device driver 3rd version snull, c and improving the COW technology, the Zero-Copy technology in Linux (kernel version 2.6.11 ) is implemented. In the end, the success test tells us that the thorough analysis of network device driver is the foundation of many applications, and it also provides a certain improvement to a lot of real applications, even to military application development.  相似文献   

17.
For measuring velocity and impacting position of single fragment of warhead, a non-contact measuring method is proposed, in which a six-light-screen array, a position indicator, a multi-channel chronograph and a computer are used.The principle of measurement is described. The key device of the system is a light screen array sensor which consists of six light screens allocated with certain geometrical parameters. When the fragment flies through the light screen array, the time of passing through each of the screens is recorded by the multi-channel chronograph. According to the time data and the geometrical parameters of the array, the velocity vector and the location of the fragment can be calculated immediately. The presented method can be used to locate the fragment and to measure the real velocity on its flying direction. It can also be used to measure the velocity of a fragment swarm after the system is engineered further.  相似文献   

18.
An expression for estimating the aeroheating on a warhead nose at different supersonic speeds is proposed by incorporating CFD (computational fluid dynamics) and the least-square method. Compared with the traditional estimation formula, the expression is more accurate, convenient and can be used in the optimized design of warheads. The error from the result obtained in the test of a ball cartridge flight is less than 3 %. It satisfies the engineering requirements.  相似文献   

19.
The nonlinear dynamic model of spinning ballistic missiles is established during the first boosting phase of the missile. Based on the conventional backstepping sliding mode control and the assumption of a two time-scale separation of missile dynamics, a graded sliding mode controller is designed with two sub-sliding surfaces which have invariability to external disturbances and parameter perturbations, and a matrix which comprises three first order low pass filters is introduced to prevent "explosion of terms". Owing to the upper bounds of the uncertainties are difficult to obtain in advance, adaptive laws are introduced to estimate the values of the uncertainties in real-time. Eventually, the numerical simulation results given to show the proposed controller can ensure the steady flight of missiles.  相似文献   

20.
阐述了数码电子雷管中,点火药剂细结晶三硝基间苯二酚铅(LTNR)的制备工艺;从点火药剂的种类、加入黏合剂的质量分数、桥丝直径、点火头的电阻值、防潮漆的蘸涂等方面对点火头性能的影响因素进行了探讨;通过震动试验、并联起爆试验、延期精度检测与考核,试验结果表明:一次性合成的细结晶LTNR是制造数码电子雷管点火头较为理想的点火药剂,按技术要求生产的点火头性能指标能够满足行业标准要求。  相似文献   

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