冲突证据融合算法性能分析

针对D-S证据理论在处理冲突证据时存在的不足,对不同冲突证据融合算法的性能进行分析。仿真结果表明,Yager算法无法有效处理冲突问题。孙全和Murphy理论主要利用加心策略的可靠性解决冲突证据的融合问题,收敛性差。而邓勇算法采用的加性策略在加性合成同时,引入证据距离函数以得到各证据的可信度作为权值对证据进行加性合成,因此收敛性优于孙全和Murphy算法。关欣算法先对冲突证据进行合理修正,消除证据间冲突,再采用D-S算法进行合成,但该算法证据的冲突由敌方干扰引起,具有一定局限性。     

干扰情况下单传感器的数据融合算法

针对D-S证据理论在处理冲突证据时存在的不足,提出了一种改进的单传感器被干扰情况下的数据融合算法。该算法首先采用加性策略对原证据集进行处理,消除冲突,然后利用D-S证据理论的合成公式进行融合,得到最终合成结果。最后进行仿真试验,仿真试验结果说明该算法能有效地排除干扰,得出符合实际的合成结果。     

基于改进 D-S 证据理论的海上信息融合方法

针对经典D-S证据理论在实际海上态势分析中对高冲突的证据融合结果准确性较低的问题,提出一种改进D-S证据理论的数据融合方法.通过基于万有引力定律的证据距离公式来衡量证据之间的冲突程度,将冲突较大的融合结果赋予较小的权重,并通过海上武器识别案例进行融合.结果表明,该方法证据冲突越明显,优势越大;证据之间冲突较小时,其融合结果和经典D-S证据理论一致,并具有更高的准确度和稳定性.     

基于D-S证据理论的预警卫星探测效能评估方法

为减少预警探测卫星探测效能评估中的不确定性,弥补模糊层次分析法等传统评估方法在处理不确定问题上的不足,提出了一种基于D-S证据理论(Dempster-Shafer证据理论)的效能评估方法.该方法将评估指标和评估信息看作是D-S证据理论中的焦元和证据源,再利用Dempster聚合规则进行聚合.结果表明:此方法比传统的模糊AHP法具有更强的处理不确定性信息的能力,可以提高评估的精度.     

基于D-S证据理论的多传感器目标识别信息融合方法

多传感器目标识别系统中多个信息源之间证据高度冲突时,采用传统的D-S证据理论进行信息融合有一定的缺陷。根据信息源间证据冲突的程度,提出了一种新的证据融合算法,该算法依据少数服从多数的原则,首先根据信息源间冲突程度的计算出各信息源权重,再采用D-S组合规则对加权后的信息进行组合。算例分析结果证明了该方法在用于多传感器目标识别系统的有效性和优越性。     

基于证据推理的卫星遥感探测效能评估

针对卫星遥感探测评估问题,根据遥感卫星的系统特点,构建了卫星遥感探测效能的评估指标体系,以此为基础,提出利用D-S证据推理方法,有效融合专家系统信息,降低卫星遥感探测评估中的不确定性,建立基于证据推理的卫星遥感探测效能评估模型;最后对卫星遥感探测评估问题进行仿真计算,仿真结果表明:该模型能够实现确定信息和不确定信息的结合,使卫星遥感探测效能评估更结合实际、更加科学合理。     

一种冲突情况下的自适应证据理论合成公式

文中研究比较了几种冲突严重情况下的证据理论合成公式．鉴于D-S证据理论合成公式的不足，文中提出了一种基于基本概率赋值加权的吸收算法。该算法可以根据证据的基本概率赋值确定冲突分配中的权值，算例结果表明：该合成公式的计算结果合理，很好地解决了证据理论在冲突严重下的合成问题。     

一种D-S证据理论的改进方法及其在目标识别中的应用

研究了基于D-S证据理论的多传感器信息融合算法，提出一种基于D-S理论的推广方法来解决融合信息的证据冲突问题，并将其用于红外成像／毫米波复合制导系统来进行目标识别的决策信息融合，结果比较理想，能够有效地化解证据间的冲突问题，提高识别系统的可靠性与准确度。     

P 距离确定信息量的证据合成方法

针对D-S证据理论在对高度冲突的证据进行融合时可能出现与直觉相悖的情况,在对一些经典改进方法分析的基础上,提出一种基于P距离确定信息量的证据合成方法。在保证各证据之间冲突整体最小的情况下,建立证据权重分配模型,利用遗传算法求出权值,根据权值确定各证据的可取信息量,对基本概率分配函数进行转化。实例分析表明,改进的D-S算法具有抗干扰能力强和决策风险低等特点,能提高证据组合结果的可信性。     

组合D-S证据理论在多传感器信息融合中的应用

在多传感器的目标跟踪领域中,Dempster-Shafer证据理论及其组合方法得到了广泛的应用,但该理论本身也存在一些不足之处.针对D-S组合规则无法解决冲突证据这一情况,根据传感器的优先级不同,提出了采用组合的改进算法来取得合乎直观的合理结果.该算法简单,避免了复杂的数学运算,具有良好的工程应用背景.给定方法与传统D-S理论相比,提高了决策的准确性.     

Nitrosation and Nitration of Tetraacetyldibenzylhexaazaisowurtzitane

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.     

A Robust Algorithm for Watermarking 2D Vector Maps with Low Shape-Distortions

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.     

Open Rule-setting System Applied to Conceptual Design of Engines

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.     

Research on Linux Network Device Driver

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.     

Improvement and Experiment of the Reamer in Vibra Cutter Against Wave Edge of Titanium Sheet Alloy Parts

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.     

Experimental Study on the Small Flyer Initiating Behavior of Fine-grained Explosives

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.     

Algorithm for Multi-laser-target Tracking Based on Clustering Fusion

Multi-laser-target tracking is an important subject in the field of signal processing of laser warners. A clustering method is applied to the measurement of laser warner, and the space-time fusion for measurements in the same cluster is accomplished. Real-time tracking of multi-laser-target and real-time picking of multi-laser-signal are introduced using data fusion of the measurements. A prototype device of the algorithm is built up. The results of experiments show that the algorithm is very effective.     

Influence of Installing Error on the Surface Shape Precision of the Axial Symmetry Aspheric Workpiece in Lapping

A method to calculate the surface shape error, which is caused by the installing error between the workpiece and the lapping tool in the process of form lapping, is proposed. The mathematical model which the installing translation error influences on the workpiece surface shape error is established. The changing rule of the error is simulated through the calculating example of the paraboloid workpiece. The results indicate that the surface shape error of the workpiece is increasing with the increase of the installing translation error, it is also increasing gradually along the center point of the curve surface to the edge, and the influence is severer to the curve surface with great curvature than that of the small curvature when the translation error is the same.     

Experimental Research on Output Performances of Giant Magnetostrictive Actuator

The paper introduces the performances of magnetostrictive actuators and its applications, discusses the design methods for the structure and internal magnetic circuit of a giant magnetostrictive actuator, and makes tests on the output displacement and force characteristics for an actuator using homemade magnetostrictive material. The experimental result shows that the actuator has satisfactory output precisions and ranges in transient and stable states, and can be used in lowfrequency vibration control system of precise equipment.     

Robust Graded Sliding Mode Tracking Control for Low Speed Spinning Ballistic Missiles

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.