Data decomposition using independent component analysis with prior constraints

In many data analysis problems, it is useful to consider the data as generated from a set of unknown (latent) generators or sources. The observations we make of a system are then taken to be related to these sources through some unknown function. Furthermore, the (unknown) number of underlying latent sources may be less than the number of observations. Recent developments in independent component analysis (ICA) have shown that, in the case where the unknown function linking sources to observations is linear, such data decomposition may be achieved in a mathematically elegant manner. In this paper, we extend the general ICA paradigm to include a very flexible source model, prior constraints and conditioning on sets of intermediate variables so that ICA forms one part of a hierarchical system. We show that such an approach allows for efficient discovery of hidden representation in data and for unsupervised data partitioning.     

Investigation into Displacement of Placer Gold Particles

The experimental research in displacement of gold particles in washed-out thickness of sand-gravel layer is conducted. The parameters of ability of gold particles to migrate in pulp flow are determined, and their immersion into loose soil is investigated.     

Emission Of Volatile And Semivolatile Organic Compounds From Waterborne Paints – The Effect Of The Film Thickness

A waterborne paint was applied to tin plated steel sheets with three different film thicknesses. The emission of volatile and semivolaile organic compounds ((S) VOCs) from the samples was measured in small climatic chambers under standard conditions over a two-week period. The purpose of the study was to evaluate the effect of the film thickness on the emission rate decay. First order decay models, including sink effects for the high boiling (S) VOCs, were fitted to the concentration versus time data. The results showed that the first order rate constants decrease with increasing film thickness. In uddition, the results indicated that the emissions of the (S)VOCs in the waterborne paint film seemed to be controlled by evaporation. The thicknesses of paint films used in climatic chamber tests to estimate emission rates for product compurison or emission prediction must be known in order to prevent erroneous conclusions     

砼受压损伤力学本构模型的研究

本文利用ＭＴＳ公司８１５．０２型电液伺服试验系统对砼进行了等应变速率加载控制的应力一应变全曲线试验，应用不可逆热力学和内变量理论的成果建立了砼损伤力学模型，并用概率统计的观点分析了损伤的演化规律。由于考虑了不可逆变形的影响，本文所建本构模型与实验吻合较好。     

船舶操纵非线性系统的鲁棒变结构控制

本文采用伪线性化变换将船舶操纵非线性系统近似地化为线性可控正则型，并对线性化系统设计了一种连续的变结构以提高整个闭环系统的鲁棒性。该方案用于限制水域中船舶的航向航迹纠编控制中，取得了预期的结果。     

一种新型图形描述算法

本文提出一种新型的图形描述算法，该算法以各种规则图形作为图形的最小处理单位。利用本算法构造的图形管理系统可广泛用于环境实时监控、采样数据动态显示等领域     

Optimizing a multiserver queuing system with a variable number of servers

A multiserver Poisson queuing system with losses, with a variable number of servers, and an additive quality functional is investigated. All major characteristic of the system are obtained in an explicit form. __________ Translated from Kibernetika i Sistemnyi Analiz, No. 4, pp. 92–101, July–August 2007.     

Subspace identification of MIMO LPV systems using a periodic scheduling sequence

A novel subspace identification method is presented which is able to reconstruct the deterministic part of a multivariable state-space LPV system with affine parameter dependence, in the presence of process and output noise. It is assumed that the identification data is generated with the scheduling variable varying periodically during the course of the identification experiment. This allows to use methods from LTI subspace identification to determine the column space of the time-varying observability matrices. It is shown that the crucial step in determining the original LPV system is to ensure the obtained observability matrices are defined with respect to the same state basis. Once the LPV model has been identified, it is valid for other nonperiodic scheduling sequences as well.     

复杂山区静校正方法研究及效果

对于山区地震勘探，开展静校正研究是资料处理的主要问题之一。静校正精度与剖面质量密切相关，准确的静校正取决于合理的方法和正确的应用。本文在分析了复杂山区特点以及静校正难点的基础上，指出要解决好山区静校正，仅限于普通的方法是远远不够的，必须从四个关键点人手，即风化层延迟时的求取、基准面的确定、校正速度的研究以及表层模型的建立等。本文对上述问题的研究做了介绍，展示了合成延迟时法十等效速度模型反演十变速浮动基准面（地震参考面）静校正等综合技术在太行山区（山西沁源、大寨）、伊J；1丘陵山区等复杂地表区应用的例子。显著的处理效果表明，严重的山区静校正问题得到了较好的解决，满足了地下构造的叠加成像，提高了勘探精度及其整体效果。     

数字微波无线通信系统中的中频自适应均衡器

在数字微波无线通信系统中，由于多径衰落引起码间干扰，使系统性能恶化，必须采用抗多径衰落的措施．中频频域均衡器（ＩＦＥ）由于结构简单而且经济，在衰落不十分严重的情况下性能良好，因而在数字微波系统中被广泛采用．本文比较了几种常用的ＩＦＥ，并着重对自适应谐振武中频均衡器的两种调节方法作了研究．模拟计算得到的ｓｉｇｎａｔｕｒｅ曲线表明，这种均衡器对非最小相位（ＭＭＰ）信道的传输性能有很大的改进，且两种调节法可达到相近的结果，如选择其中较简单的调节法，可以简化硬件结构．