基于AHP的风电机组变桨系统权重分析

在风电场远程监控系统中,能够实现风电场中风电机组的故障诊断与预测,对于风电机组的安全、稳定、经济运行具有重要意义。在风电场监控系统中只是对风电机组单个参数进行实时监控,当监控系统某一参数超过阈值范围时,无法确定风电机组中某个具体部件存在问题。因此分析风电机组远程监控系统中实时参数对风电机组中设备的权重影响变得极为重要。本文旨在对风电机组中故障率频发的变桨系统进行深入探究,针对影响变桨系统故障的各项因素,运用APH方法进行权重评估,得出各个因素对变桨系统的影响程度,从而更加准确地判断出变桨系统的故障原因。

相关子系统权重系数的确定

本文利用概率测度定义了权重系数函数,对具有相关性子系统的权重系数进行讨论并给出具体求法.实际中系数修正方法也同时给出.

智能火灾报警联动系统的设计研究

针对市场上火灾报警系统布线复杂,报警联动控制系统数学模型不够完善的实际问题,提出了运用嵌入式多CPU控制、总线探测、总线控制的方案。在系统设计中引入物理结构和逻辑结构的概念,使系统在布线时不用考虑系统物理结构和火灾显示器的分布影响,只需能满足系统逻辑结构的要求,从而大大简化系统布线复杂度。同时为系统建立火灾报警联动控制的数学模型,提出了模型中两种关键参数-系统权重和误报指数。针对不同的监控现场只需设定相关参数便可实现,系统可以现场编程实现总线探测以及联动控制模型。在监控中采用多级网络监控的方式,实现远程监控的功能。

基于多元评价函数的蓄冷式空调系统优化分析

通过研究影响蓄冷式空调系统的多种因素 ,获得表征因素重要程度的权重矩阵。分析了蓄冷式空调系统的多元特性 ,得到在制冷效果、投资、回收期以及对环境影响等因素下的决策论域和影响指标函数集。通过建立多元评价函数 。

不确定多状态权重k/n系统可靠性分析

多状态权重k/n系统含有n个元件,每个元件有多种可能的状态,不同状态下有不同的权重,当工作元件的权重和不低于预设值k时,系统工作.针对实际系统中大量数据缺失或数据失效等情形,将不确定理论引入多状态权重k/n系统的可靠性分析中.假设系统中各元件状态及其权重是不确定变量并且相互独立,建立了系统可靠性的数学模型,并通过严格数学推导将其转换为逆分布等价模型.同时设计了二元搜索算法推导出该系统的可靠性测度,丰富了不确定系统可靠性的现有理论.另外,还对系统中元件的重要性测度进行分析,并给出相应算法.结果表明,所建模型和提出的算法能够通过元件的离散不确定状态变量和连续不确定权重变量来获得系统可靠性测度和元件重要性测度并有针对性的对整个系统的性能进行改善.

数量分类的加权聚类法

叙述了加权聚类的基本思想与方法，即应用性状多样性理论与计算方法获得各统计性状的聚类权重，应用Ｂ模距离进行加权聚类分析，通过实例证明了加权聚类法对解决数量分类学系统聚类中权重不合理（对各性状权重均等），对各公式计算结果不一等问题的有效性．

雷达干扰效果的Vague集评估方法

雷达干扰效果评估是电子对抗领域的一个重要研究课题。提出用Vague集替代模糊综合评估方法中的隶属度,建立干扰效果的评估指标体系,提出了基于Vague集的雷达干扰效果评估算法,利用Vague集加权距离来判定干扰效果等级。结合实例说明,该方法是可行、有效的。

粒子滤波算法改进策略研究

为了改进粒子滤波算法的性能,这里研究了一种粒子滤波算法改进策略。该粒子滤波算法改进策略包括四部分:首先,采用了结合退火参数的混合建议分布,以考虑当前观测测量值的最新信息;接着,基于有效样本大小确定自适应重采样的阈值,以保证有合适的重采样次数;然后,基于权重优化思想提出了一种改进的部分系统重采样算法,在利用算法执行速度快的同时优化部分系统重采样算法;最后,在重采样后执行粒子变异操作,以保证样本的多样性。通过仿真实验,粒子滤波改进策略的性能和有效性均得以验证。

Scales,methods and technical analysis of China's residential environment evaluation

To improve China＇s residential environment evaluation system and enhance its guiding role, current research results are analyzed and summarized from three aspects including research scales, evaluation methods and applied technology by means of comparison, induction and empirical application. The guiding role of the current macro-scale evaluation system of urban planning and construction is generally not obvious, whereas the guiding role of medium and micro-scale systems to the improvement of residential environments is improving. There are diversified methods for determining the threshold values and the weights of indices in China＇s evaluation system. For instance, the analytic hierarchy process（AHP） method is adopted to determine the weights of indices. The advantages and disadvantages of the method are analyzed on the basis of empirical calculation. In the course of comprehensive analyses, a nonlinear model can reflect interactions among indices more than a linear model; the evaluation model under the ARCGIS platform prevails since it combines space and attribute, and it has intuitive results. So far, the methodological system of China＇s residential environment evaluation has not been established; its subject coverage and research category should be expanded, and its guiding role should be enhanced.

混合溶液中质量分数求值判定式的推导与应用

通过具体实例分析论述了混合溶液中质量分数的求值问题,在对常规解法进行剖析的同时,从理论上建 立了新的解题方法.

WEIGHTED ALGORITHM FOR FINGERPRINTING RELATIONAL DATABASES

The necessity and the feasibility of introducing attribute weight into digital fingerprinting system are given. The weighted algorithm for fingerprinting relational databases of traitor tracing is proposed. Higher weights are assigned to more significant attributes, so important attributes are more frequently fingerprinted than other ones. Finally, the robustness of the proposed algorithm, such as performance against collusion attacks, is analyzed. Experimental results prove the superiority of the algorithm.

基于多维加权贴近度方法的方案优选

在决策支持系统中经常遇到从以前的方案库中优选方案进行决策。方案选择会对决策结果影响很大,常常有一定的模糊性。用多维加权贴近度方法可以很好的计算出方案库中的方案与目标方案的相似程度,相似程度最高的方案即为最优方案。此方法分析了三种类型的定量特征以及模糊特征的隶属度函数的设定,两种常用贴近度的使用,用权重分析系统进行特征权重的设置。实例证明该方法比一般加权和方法选出的最优方案更准确、更有效。

关于城镇建设发展条件的综合评价——以呼和浩特市域城镇体系规划为例

城市是国家或一定地域范围的政治、经济、交通、科技、文化中心。它的形成与发展是社会、自然、经济、政治等多种因素综合作用的结果。确定其合理发展的总原则是使其社会、经济、生态环境的综合效益得到最大限度发挥。

基于多维加权贴近度方法的方案优选

在实际工程设计中经常遇到从以前的方案库中优选方案的问题.用多维加权贴近度方法可以很好地解决这个问题,分析了隶属度函数的选取、贴近度的选择、权重的设定以及它们对加权贴近度的影响.实例证明该方法有效、可行.

Identification of LPV Models with Non-uniformly Spaced Operating Points by Using Asymmetric Gaussian Weights

In this paper, asymmetric Gaussian weighting functions are introduced for the identification of linear parameter varying systems by utilizing an input-output multi-model structure. It is not required to select operating points with uniform spacing and more flexibility is achieved. To verify the effectiveness of the proposed approach, several weighting functions, including linear, Gaussian and asymmetric Gaussian weighting functions, are evaluated and compared. It is demonstrated through simulations with a continuous stirred tank reactor model that the oroposed aonroach nrovides more satisfactory aonroximation.

GIS-based Earthquake-Triggered Landslide Hazard Zoning Using Contributing Weight Model

Earthquake-triggered landslides have aroused widespread attention because of their tremendous ability to harm people's lives and properties.The best way to avoid and mitigate their damage is to develop landslide hazard maps and make them available to the public in advance of an earthquake.Future construction can then be built according to the level of hazard and existing structures can be retrofit as necessary.During recent years various approaches have been made to develop landslide hazard maps using statistical analysis or physical models.However,these methods have limitations.This study introduces a new GIS-based approach,using the contributing weight model,to evaluate the hazard of seismically-induced landslides.In this study,the city and surrounding area of Dujiangyan was selected as the research area because of its moderate-high seismic activity.The parameters incorporated into the model that related to the probability of landslide occurrence were:slope gradient,slope aspect,geomorphology,lithology,base level,surface roughness,earthquake intensity,fault proximity,drainage proximity,and road proximity.The parameters were converted into raster data format with a resolution of 25×25m2 pixels.Analysis of the GIS correlations shows that the highest earthquake-induced landslide hazard areas are mainly in the hills and in some of the moderately steep mountainous areas of central Dujiangyan.The highest hazard zone covers an area of 11.1% of the study area,and the density distribution of seismically-induced landslides was 3.025/km2 from the 2008 Wenchuan earthquake.The moderately hazardous areas are mainly distributed within the moderately steep mountainous regions of the northern and southeastern parts of the study area and the hills of the northeastern part;covering 32.0% of the study area and with a density distribution of 2.123/km2 resulting from the Wenchuan earthquake.The lowest hazard areas are mainly distributed in the topographically flat plain in the northeastern part and some of the relatively gently slopes in the moderately steep mountainous areas of the northern part of Dujiangyan and the surrounding area.The lowest hazard areas cover 56.9% of the study area and exhibited landslide densities of 0.941/km2 and less from the Wenchuan earthquake.The quality of the hazard map was validated using a comparison with the distribution of landslides that were cataloged as occurring from the Wenchuan earthquake.43.1% of the study area consists of high and moderate hazardous zones,and these regions include 83.5% of landslides caused by the Wenchuan earthquake.The successful analysis shows that the contributing weight model can be effective for earthquake-triggered landslide hazard appraisal.The model's results can provide the basis for risk management and regional planning is.

A precise and accurate acupoint location obtained on the face using consistency matrix pointwise fusion method

OBJECTIVE: To develop a more precise and accurate method, and identified a procedure to measure whether an acupoint had been correctly located.METHODS: On the face, we used an acupoint location from different acupuncture experts and obtained the most precise and accurate values of acupoint location based on the consistency information fusion algorithm, through a virtual simulation of the facial orientation coordinate system.RESULTS: Because of inconsistencies in each acupuncture expert's original data, the system error could not be modified using the characteristics ofthe general weight calculation. First, we corrected each expert of acupoint location system error itself,to obtain a rational quantification for each expert of acupuncture and moxibustion acupoint location consistent support degree, to obtain pointwise variable precision fusion results, to put every expert's acupuncture acupoint location fusion error enhanced to pointwise variable precision. Then, we more effectively used the measured characteristics of different acupuncture expert's acupoint location, to improve the measurement information utilization efficiency and acupuncture acupoint location precision and accuracy.CONCLUSION: Based on using the consistency matrix pointwise fusion method on the acupuncture experts' acupoint location values, each expert's acupoint location information could be calculated, and the most precise and accurate values of each expert's acupoint location could be obtained.

Using Weights of Evidence in the Spatial Relation Between Infected Snails and Geographic Factors

Schistosomiasis is a serious public health problem in the middle-lower Yangtze River Basin in China. Study of spatial variation of snail distribution that is related to microgeographic factors can help to choose pertinent measures for snail extinguishment and environment rebuilding. This paper studied the theoretical architecture of weights-of-evidence approach. The case study was made for spatial relation between the occurrence of infected snails and geographic factor combinations in Waijiazhou marshland of Poyang Lake region in China. The multievidence data came from the geographical factor combinations by crossing operation of vegetation coverage grade layer, cattle route distance grade layer, and special environment layer (181 combinations in total) in GIS. The calculation of weight contrast index shows that high vegetation coverage, cattle route distance of <45 meters, and special geographic factor "ground depression" had direct spatial relation with the occurrence of infected snails. The verification by crossing operation in GIS indicated 72.45% of the infected snails concentrated on the areas of positive weight contrast index (sequenced in an order of weight contrast index from high to low), demonstrating the high efficiency of the model established in finding infected snails according to the geographic factor combinations that can be explicitly discerned in the study area.