一种MPEG-4编码的视频源业务建模

针对MPEG－4的低质量和高质量两种编码质量的视频源，给出了一种混合模型，此模型在多个时间尺度上反映帧大小的变化；场景的变化和同一场景内码流的波动，用几何分布来描述场景的变化，用AR（2）模型来反映同一场景内码流的波动，对I帧采用合成模型建模，对P，B帧采用几何分布建模，最后将此模型与不考虑场景变化的几种情况进行了比较，并且对它们的排队性能作了分析，证明了这种合成模型能够很好地反映实际视频流的特征。     

带拖车的移动机器人系统的动力学研究

本文研究由一个牵引车和N-1个拖车所组成的移动机器人系统的动力学。采用KANE方法建 立此系统的动力学模型，其中导出式系数的计算采用了递归算法，基于此进一步给出拖车节 数变化后系统动力学模型重构方法。     

工作流演进变化中迁移策略的自动生成

工作流演进变化中一个重要问题就是如何实现工作流实例的迁移问题。提出了一种支持演进变化的工作流过程模型及相关的实例模型和修改模型，并在此基础上提出了一种新的迁移策略。该策略中每个节点的迁移规则根据工作流模型修改点与实例执行路径的关系确定相应的迁移动作。此外，还提出了一个根据工作流模型修改点的偏序关系自动生成各节点迁移规则的算法。     

基于势态神经元控制的室温控制系统

简述了室内温度控制的基本结构和工作原理，提出了一种基于神经元控制的两位式室内温度控制方案，仿真实验证实了势态神经元模型在室温控制系统中应用的可行性。     

面向未知环境基于智能预测的模糊控制器研究

提出了一种新的面向未知环境的智能预测算法，并将此算法应用于机器人力跟踪控制中．该方法利用机械手末端与未知受限环境产生的接触轨迹，通过模糊推理智能地预测阻抗控制模型中的参考轨迹，并根据力误差变化用参考比例因子对其进行调节，以适应未知环境刚度的变化．通过对阻抗模型参数进行模糊调节减少受限运动中的力误差，提高了全局的力控制效果．仿真结果证明了此算法的有效性．     

流体声发射传感器实验性能研究

在专用实验台和测试系统上，对流体声发射传感器进行了水流体、油流体和空气流体及流体温度变化时的多种实验，给出了实验性能曲线，对影响其传播性能的各种因素进行了讨论，针对金属表面摩擦磨损进行了实验研究，给出了此流体声发射传感器传播的经验模型，为正确利用此流体声发射传感器奠定了实验基础，     

一种改进的单个神经元控制算法

本文介绍了一种改进的单个神经元控制算法，此算法具有快速性和较强鲁棒性，对参数变化的控制对象，控制效果尤为突出。通过对具有代表性的工业控制对象的模型仿真，表明了这种算法的可行性和有效性。     

基于Petri网的人力资源管理的模型设计

讨论了工作流管理系统中Petri网建模技术的基本特点，并利用Petri网建立了企业生产管理中人力资源管理的模型。该模型可作为工作流管理系统中的一个子模型，一旦企业的业务过程发生了变化，用户可通过面向对象的Petri网对业务过程的流程进行修改，修改后的流程将自动地应用在工作流管理系统中。此模型满足了企业建立特定资源模型的需要，实现了业务流程重组的要求，具有适用性和灵活性，为人力资源的自动化办公提供了方便。     

车辆监控系统中时空数据模型设计与实现

针对车辆监控GIS系统中车辆对象轨迹数据变化频率较高、数据量大的特点，首先分析了当前常用的几种数据存储方法，然后在时空立方体模型基础上，提出通过切分时空立方体，形成单元时空立方体，并建立轨迹版本的建模思想。对模型的实现和基于此模型的时空查询算法进行了详细阐述。验证表明该模型能满足实际应用的需要，在减少存储和时空查询性能上有较大提高。     

基于解剖学的人手肌肉建模技术

为实现仿真手在运动过程中符合人手的生理特性及运动特点，文中通过分析手的解剖结构，总结控制手部运动和形状的约束参数．采用层次建模方法，先建立用线段表示的含有约束参数的手部骨骼模型，然后在此基础上根据手部的特征横截面确定特征多边形，采用NURBS面片拟合的方法建立依附于骨骼之上的肌肉模型。此方法建立的手部模型在运动仿真过程中，手部肌肉以对应的骨骼为轴线并随着骨骼各个参数的变化而发生相应的变化，最终取得良好的仿真效果。     

Comparison of the detailed plasma composition for different models

A self-consistent model with compensation for strongly coupled plasma is described. The effective algorithm to solve the equations of this model is proposed. The calculation of the ionization tables is performed. This model is compared with the Thomas-Fermi model with quantum and exchange corrections (TFC) and with the self-consistent model of ionization equilibrium without compensation. It is established that the model is in agreement with the TFC model for rarefied and rather dense plasma and differs from it for condensed matter. The effects of plasma non-ideality and electron degeneration are considered.     

A dynamical model for the vertical infiltration of water into the soil

An approximative lumped parameter model for infiltration is introduced. The model is a spatial discretization of a basic non-linear partial differential equation of the infiltration. The model aims to describe the input-output relation between the rainfall rate and the infiltration rate. The model can be used as a part of a larger rainfall-runoff model, and it can be interpreted as a simple aggregation model of an infiltrating catchment. A great number of simulation runs were carried out with the model. Many of the conventional results of infiltration can be satisfactorily described by the present simple model, e.g. the commonly used Horton's equation.     

GRAPES有限区域伴随模式内存优化

GRAPES有限区域伴随模式是基于自动微分工具TAPENADE转换与手工代码编写相结合的方式开发而成,主要由模式程序和内存支撑函数库(PLP库)构成。由于TAPENADE采用全存储策略来保存中间变量,造成了伴随模式运行过程中内存开销过大,并且出现随着时间步的增加内存不断增长的情况。对伴随模式内存支撑函数库中POP类函数算法进行修改,解决了内存增长的问题;从整型变量、实型变量和正模式子程序调用三个方面对模式程序进行优化,使得伴随模式运行时的内存开销显著减少。     

Investigating the accuracy of vegetation index-based models for estimating the fractional vegetation cover and the effects of varying soil backgrounds using in situ measurements and the PROSAIL model

Fractional vegetation cover (FVC) is an important variable for describing the quality and changes of vegetation in terrestrial ecosystems. The simplest and most widely used model for the estimation of FVC is the dimidiate pixel model. The normalized difference vegetation index (NDVI) is commonly used as a vegetation index (VI) in this model. A range of VIs is possible alternative to the use of NDVI in the dimidiate pixel model. In this article, six VI-based dimidiate pixel models were compared using in situ measurements and canopy reflectances simulated by the PROSAIL model over nine different soil backgrounds. A comparison with in situ measurements showed that the Gutman–Ignatov method overestimated FVC, with a mean root mean square error (RMSE) of 0.14. The mean RMSE had an intermediate value of 0.08 in the Carlson–Ripley method and was further reduced to 0.05 in the method proposed by Baret et al. The use of both modified soil-adjusted vegetation index (MSAVI) and a mixture of NDVI and the ratio vegetation index (RVI) to replace NDVI in the Gutman–Ignatov model reduced the RMSE to 0.06. The mean RMSE in the difference vegetation index (DVI)-based model was 0.08. The simulated results indicated that soil backgrounds have significant effects on these VI-based models. The sensitivity of the first three models and the NDVI plus RVI-based model to soil backgrounds decreased with an increase in soil reflectance. In contrast, the DVI-based model is sensitive to soil backgrounds with high reflectances. MSAVI, which is less sensitive to soil backgrounds, represents a feasible alternative to the use of NDVI in the Gutman–Ignatov model.     

HY-2高度计海况偏差非参数估计模型研究

基于HY-2高度计数据,采用局部线性回归非参数估计方法,利用球谐核函数及局部可调带宽,对70和71周期的交叉点进行海况偏差非参数估计。依据解释方差、海况偏差与有效波高及风速的相关度和模型残差分析,检验评价模型。与相同数据集下的参数模型估计结果进行了分析比对,结果表明:所选定的非参数模型的海况偏差与有效波高和风速的相关度均处于较高水平,说明模型更为有效。在不同纬度段,非参数模型和参数模型各有所长,在北半球高纬度区域,非参数模型表现更优。     

Research of the human eye model with variable-focus liquid lens

The human eye optical model with variable-focus liquid lens based on Chinese human eye model is presented for the first time. The Varioptic Arctic 316 liquid lens is used as a substitute for the crystalline lens in the model. The dioptric power and the MTF of the human eye model with variable-focus liquid lens are analyzed theoretically. The result shows that the human eye model with the liquid lens under applied voltage of about 53 V can be used as an emmetropia model. This research work can provide a novel idea for suitable model for clinical regulation and control with Chinese eye.     

Running the Economy: A Review of the Internet-Based Fairmodel

Since February 1997, Fair's large macroeconometric multi-country model has been freely available through the internet. In this article both the history and the use of the Fairmodel are discussed. The Fairmodel enables students to work with real data and it makes economic theory come to life. A drawback is that getting started with the model can take up a great deal of time. A realistic example of working with the model is presented. The Fairmodel shows that the internet could drastically change the manner in which economics is taught.     

Rapid generation of the piping model having the relationship with a hull structure in shipbuilding

At the initial stage of ship design, a hull structural model, that is, 3D CAD model of a hull structure is not generated by the existing shipbuilding CAD system because it is time-consuming and requires much effort. As a result, a designer is generating a piping model, that is, 3D CAD model of the pipes in the hull structure, independently of the hull structural model at the detailed design stage. The designer must manually modify the piping model whenever the hull structural model changes. To lighten the burden imposed on the designer, a generation method of the piping model based on the hull structural model is developed in this study. The applicability of the developed method is demonstrated by applying it to a deadweight 300,000 ton VLCC (Very Large Crude Oil Carrier). The result shows that the developed method can quickly generate the piping model having the relationship with the hull structure in early time.     

A two-stage dynamic sales forecasting model for the fashion retail

The difficulty with fashion retail forecasting is due to a number of factors such as the season, region and fashion effect and causes a nonlinear change in the original sales rules. To improve the accuracy of fashion retail forecasting, a two-stage dynamic forecasting model is proposed, which is combined with both long-term and short-term predictions. The model introduces the improved adjustment methods, the main adjustment model and error forecasting model in the adjustment system collaborated with each other. The real-time data are demonstrated by applying the model in wireless mobile environment. The experiment shows that the model provides good results for fashion retail forecasting.     

静态计算机取证的过程模型研究

由于电子证据的特殊性,计算机取证必须遵循严格的过程和程序,否则,就会导致所获取的证据缺乏可靠性和真实性。一个实用的计算机取证模型很重要,这是因为它能不依赖任何一种特殊的技术或组织环境,为研究支撑调查工作的技术提供一种抽象的参考构架。该文针对静态计算机取证的过程模型进行了研究,并就模型涉及的相关步骤进行了分析。