集对云决策方法的研究

借鉴云模型和集对分析的核心研究思想,提出一种用于自然语言评价的多属性决策方法-集对云决策方法,主要工作如下:首先,针对多属性群决策的属性评估集和等级评估集设计了等级描述云和等级评价云;然后,在此基础上设计了云归一化算法实现了一个属性多个专家值的融合;最后,设计了集对评估算法,将多个属性值评价等级从同一、对立、不确定三个角度进行系统化描述,进而得各评估方案的可行性系统描述方程,通过图示比较分析获知可行性最佳方案.最终,通过能源方案评估应用证明了该方法的简单性和可行性,以及权衡语言评价信息的有效性.     

联系数a+bi的运算及在网络计划中的应用

定义了ａ＋ｂｉ型联系数加法、减法、乘法和除法运算,研究相应的运算规则与性质,给出了在网络计划中的应用实例。其研究结果不仅可用于网络计划管理与控制,而且还可以用于其它不确定性系统的分析与控制。     

集对云多属性群决策方法及应用

阐明了复杂现象模糊多属性决策方法的研究现状,并针对复杂现象语言调研信息存在的主观模糊性与客观随机性以及不确定性因素对决策备选方案的影响等问题,结合云模型与集对分析的相关理论和方法,研究设计了集对云多属性群决策方法。将该方法用于我国"农村新能源开发利用规划"研究中,建立了可再生能源开发决策模型,给出了相应的解法。与模糊二元语义分析法进行的比对实验说明了集对云决策法的合理性、有效性及实用性。     

wav音频LSB隐藏算法的隐写分析技术

分析了wav音频中最低有效位(LSB)替换的嵌入机制,构造了wav音频采样点值在LSB替换中形成的值对转移概率模型,依据构造的概率模型分析了卡方检测、SPA算法和DIH算法在wav音频中检测LSB算法的可行性。实验表明,以上3种算法可对基于8比特和16比特wav音频的LSB替换进行有效检测,且对此两种编码方式,当嵌入率分别高于3%和20%时,对载密音频判决的正确率可达100%。     

基于径流丰枯分类的月水量平衡模型参数响应研究

针对变化环境下水文模型参数的时间变异性如何影响径流模拟的准确性问题,提出依据径流丰枯分类后对水文模型分别率定和验证。通过常规法和集对分析法对清江流域径流丰枯分类,并将不同径流丰枯年份对应降水、蒸发输入到两参数月水量平衡模型中,率定各丰枯类型下的模型参数值,并分析不同频率的径流差异情况。结果表明:集对分析法分类后两参数月水量平衡模型的C参数值规律为枯水年平水年丰水年,常规法则为枯水年平水年丰水年; SC参数值的规律在两种方法下表现类似。从年际变化看,模型效率系数基于集对分析法分类时较大,且对于不同丰枯年份下的径流模拟更接近实测值。从年内分配看,基于集对分析法的不同频率高、中、低水相对误差综合表现优于常规法。基于此进行的交叉模拟进一步发现,使用比当前状态偏湿润年份的参数值,得到的径流响应均为增大;反之则径流响应均为减小,且所使用参数值条件与基准条件变化的幅度越大,径流响应增大或者减小的幅度就越大。     

逆向物流分级化及集对分级技术的应用

针对国内逆向物流对策少,难度大,地区发展不均衡的特点,提出了逆向物流分级化的新思路。同时,借助集对分析理论,结合熵权系数,以区域分级为例建立了分级评价模型,为该对策的实施提供了科学依据。     

Nonlinear Gaussian Belief Network based fault diagnosis for industrial processes

A Nonlinear Gaussian Belief Network (NLGBN) based fault diagnosis technique is proposed for industrial processes. In this study, a three-layer NLGBN is constructed and trained to extract useful features from noisy process data. The nonlinear relationships between the process variables and the latent variables are modelled by a set of sigmoidal functions. To take into account the noisy nature of the data, model variances are also introduced to both the process variables and the latent variables. The three-layer NLGBN is first trained with normal process data using a variational Expectation and Maximization algorithm. During real-time monitoring, the online process data samples are used to update the posterior mean of the top-layer latent variable. The absolute gradient denoted as G-index to update the posterior mean is monitored for fault detection. A multivariate contribution plot is also generated based on the G-index for fault diagnosis. The NLGBN-based technique is verified using two case studies. The results demonstrate that the proposed technique outperforms the conventional nonlinear techniques such as KPCA, KICA, SPA, and Moving Window KPCA.     

基于模糊集对法的乌鲁木齐市水资源短缺风险评价

为评价城市水资源短缺风险,以5个风险指标建立了乌鲁木齐市水资源短缺风险评价模型,基于2004～〖JP〗2010年用水量资料与随机模拟的供水量资料,结合指定情境采用模糊集对评价方法对评价模型进行求解,并与模糊综合评价法、灰关联分析法、模糊物元评价法的评价结果进行了比较。结果表明,模糊集对评价方法合理简便,乌鲁木齐市水资源短缺风险从2004年的低风险向2010年较高风险发展,未来乌鲁木齐市水资源短缺风险将持续保持在高风险下,可见乌鲁木齐市实施外部引水和内部节水措施刻不容缓。     

Self-assembly behavior of polymer-assisted clays

Layered silicate clays are natural crystallites that are well recognized for their practical uses, but little is known about their self-assembly behavior. In this review, we summarize the recent literature on clay interactions with organic polymers as well as clay self-assembly with organic involvement. We place emphasis on two aspects of these non-covalent interactions: first, plate-like clays can have a considerable impact on polymer properties such as hydrogels and clay films, and also on the encapsulation of bio-molecules. Second, through ionic intercalation with polymeric amine-salts, the clay layered structure units can be modified and enabled to self-assemble into ordered arrays such as rod-, dendrite-, and fiber-like microstructures. The silicate self-assembled morphologies such as worm-like and hollow microspheres were obtained in epoxy matrices and during spray drying, respectively. A mechanism was proposed for the clay self-assembly in two orientations, platelet face-to-face (ionic attraction) and edge-to-edge (organic hydrophobic effect). Further, the layered clays after the exfoliation into random platelets (1 nm in thickness) had strong propensity toward self-piling without any organic influence. Formation of lengthy rods or fibrils up to 5 μm in length and their hierarchical transformation under transmission electron microscope (TEM) electron beam bombardment and ultrasonication were observed. The clay thin-platelet geometric shape and surface ionic charge are two important parameters for the self-assembling tendency. The high surface of clay platelet has a significant impact on polymer interactions and drives the self-organization of inorganic-organic structures.     

SoC安全芯片物理级攻击方法及安全防护探析

安全芯片使得信息安全性大为增强，其应用正日益广泛地融入到国家安全和百姓生活中。但与此同时针对安全进行的攻击也层出不穷，这使得研究安全芯片的安全防护成为迫切需要。如今专门针对芯片的攻击技术已经不仅仅是解剖与反向提取，已发展到深层次的简单功耗分析SPA、差分功耗分析DPA、故障分析攻击等，其攻击手段还在继续进步。探析了这几种攻击方法的原理，并针对相应的攻击探讨一些可行的防护措施。