Issues in nonlinear stochastic grey box identification

Grey box identification refers to the practice of identifying dynamical systems in model structures exploiting partial prior information. This contribution reviews a method for stochastic grey box identification and surveys experiences and lessons of applying it to a number of industrial processes. Issues to be addressed include advantages and costs of introducing stochastics into the model, the question of what contribution must be expected from the model designer as opposed to what can be formalized in computer algorithms, and an outlook on future plans to resolve present shortcomings.     

Minimizing a linear objective function under a fuzzy max-t norm relation equation constraint

The work examines the feasibility of minimizing a linear objective function subject to a max-t fuzzy relation equation constraint, where t is a continuous/Archimedean t-norm. Conventional methods for solving this problem are significantly improved by, first separating the problem into two sub-problems according to the availability of positive coefficients. This decomposition is thus more easily handled than in previous literature. Next, based on use of the maximum solution of the constraint equation, the sub-problem with non-positive coefficients is solved and the size of the sub-problem with positive coefficients reduced as well. This step is unique among conventional methods, owing to its ability to determine as many optimal variables as possible. Additionally, several rules are developed for simplifying the remaining problem. Finally, those undecided optimal variables are obtained using the covering problem rather than the branch-and-bound methods. Three illustrative examples demonstrate that the proposed approach outperforms conventional schemes. Its potential applications are discussed as well.     

Modeling of the Electrostatic (Plasmon) Resonances in Metallic and Semiconductor Nanoparticles

Plasmon (electrostatic) resonances are treated as an eigenvalue problem for specific boundary integral equation. This leads to direct calculation of resonance values of permittivity and resonance frequency. The technique is illustrated by numerical examples of calculation of resonance frequencies for 3D nanoparticles.     

多级工程模糊优选在土石坝溢洪道选型中的应用

针对溢洪道设计中经常遇到的方案优选问题，提出将多因素、多层次模糊优选理论引入溢洪道的设计选型工作中。对影响因素复杂、确定隶属函数主观因素较强的情况，引入因素的优先关系法来确定优选矩阵的隶属度，这样减少了确定隶属函数的人为影响，通过此优选模型利用影响溢洪道选型的主要因素对多种溢洪道设计型式进行了多级模糊综合优选决策，得到了比较理想的决策结果，为溢洪道设计选型提供了新的思路。     

R∞关系的几个重要性质

在二元关系R的基础上构造了R^∞关系，给出并证明了R^∞关系的几个重要性质。这些性质在粗糙集理论中研究R^∞领域系统及其近似算子时甚为重要。     

Yielding, authoritarianism, and authoritarian ideology regarding groups.

This investigation was prompted by Asch's (1952) discussion of the personal and social significance of yielding to group pressure. For the person, yielding requires the inhibition of overt and perhaps implicit responses to objective situational requirements. For the group, malignant processes may arise and develop, unchecked by those members in whom goals of personal security predominate over group goals. In the present study, the view was taken that both meanings of yielding are assigned positive value in two separate ideologies concerning the group-individual relation. One of these is termed "conformity" and the other is "rugged individualism." In the study, group pressure was simulated by announcing bogus group judgments to small groups of Ss whose apparent task was to match one of three lines of variable length with a standard line. Questionnaires were used to measure variables, which were: the ideology of conformity (IC), the ideology of rugged individualism (RI), ethnocentrism (E), and authoritarianism (F). The questionnaires were administered to 91 college students, both day school and evening. It was found that the correlation with the F scale was .48 (P     

对主成分分析在搅拌桩质量检测的评判研究

简述了桩身质量检测的常用方法及评判标准,采用主成分分析原理与关联度分析原理,结合搅拌桩检测资料,对影响桩身质量的因素进行了分析研究,得出了一些有价值的结论,对搅拌桩检测方法及评判标准的改进与完善具有参考意义.     

A 3D GIS spatial data model based on conformal geometric algebra

We propose a new Geographic Information System (GIS) three-dimensional (3D) data model based on conformal geometric algebra (CGA). In this approach, geographic objects of different dimensions are mapped to the corresponding basic elements (blades) in Clifford algebra, and the expressions of multi-dimensional objects are unified without losing their geometric meaning. Geometric and topologic computations are also processed in a clear and coordinates-free way. Under the CGA framework, basic geometrics are con...     

Modeling of microstructure effects on the mechanical behavior of ultrafine-grained nickels processed by hot isostatic pressing

Bulk ultrafine-grained nickel specimens having grain sizes in the range of 0.25-5 μm were consolidated by hot isostatic pressing technique. The resulting microstructures were characterized by transmission electron microscopy and X-ray diffraction analysis. Compression tests were carried out at room temperature and at strain rate of 1.6×10⁻⁴ s⁻¹. It was found that the measured yield strength does not follow the Hall-Petch law as a consequence of the presence of oxide phase. Therefore, the use of micromechanics based model, which takes into account only the Hall-Petch relationship at grain level for predicting the grain sized effects on mechanical behavior of this kind of materials, is not accurate yet. In this study, a modification made to the generalized self-consistent model was proposed for studying both grain size and oxide phase dependence of ultrafine-grained materials behavior. Because of the novel modification, an optimization procedure with two steps was required to identify the parameters of micromechanical model. An acceptable agreement between experimental and numerical results was achieved. Moreover, the influence of texture on the yield strength and the application of the proposed model to the spark plasma sintering processed materials were also discussed.     

浅析ARCU远端模块的数据刷新

本文以开滦钱营矿ARCU远端模块数据刷新为例,首先介绍了通过显示模块、SID、SWCH电路板状态、对交换网络进行例测等方法对硬件进行检测,其次介绍了通过抛DUR、调整相关的关系表等方法对软件数据进行调整,最后介绍了使用命令完成数据刷新。