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The main work and innovation1 In general , a image compression method has different effect to different image . Some are fit for image which has much high frequency . Some are fit for image which has much low frequency .This paper analysis the applicability of fractal algorithm . In this dissertation , an improved algorithum is given . The basic algorithum without eight change and the joint use of quantitative coding , The compression ratio and PSNR can be adjusted , and it can get more quickly speed of coding .2 To a group of exact fractal code , the decoding image can be any resolution .With this characteristic ,choose the proper domain block and range block,this paper get an algorithum which can get higher decoding PSNR and speed than the basic fractal algorithum.3 Give a new method to calculate the scale factor . The calculation of basic algorithum is complex and enormous . The factor of scale is an important variable of the basic algorithm. Now there are two methods to calculate the factor of scale .A new method was given to calculate the factor of scale. The calculation load and complexity are reduced by the new method. Compared with the basic algorithm , the method can reduce coding time.4 The basic fractal algorithum is based on the Collage theorem and contraction mapping theorem . A mathematic model based on basic fractal algorithum is given .

本文的主要工作及创新点主要包括以下几点：1一般情况下，一种图像压缩的方法对不同特点的图像，压缩效果会有所不同，本文利用分形压缩编码对不同特点的图像进行编码，分析了分形编码对不同图像的编码适用性，利用去掉8种变换的分形编码算法与简单的均匀量化编码方案相结合，得到了一种可以调节压缩比与解码质量的分形编码方案，该提高编码速度6倍以上。2分形编码的特点之一是分形解码的分辨率无关性，即对于一组分形编码可以将其解码到任意分辨率下，本文利用分形编码的这一特点，结合不同的量化编码方案，选择合适的定义域块与值域块及适当的编解码分辨率，得到了一种提高解码质量，编码速度提高12倍以上的加速算法。3比例因子是基本分形算法中的一个重要变量，目前有两种计算比例因子的方法，文中给出了一种新的求比例因子的方法，该方法简化了求比例因子的计算，从整体上减小了基本分形算法的计算量，简化了算法4分形压缩的数学基础是不动点定理与拼贴定理，本文根据基本的自动分形编码方法，建立数学模型对其进行推导，得到了用普通数学的极限理论解释分形编码的数学表达式，从而对由基本分形编码得到的解码图像中的像素点的值给出了确定的表达式。

Based on the previous works, the paper first introduced and summed up the princi ples and characteristics of information processing of ANNs. Then the paper placed em phasis on their algorithms and theory foundation of application for operator approxima tion and patern recognition to lay the theory base for the study of the data-driven joint inversion.

在前人研究的基础上，本文首先归纳和总结了人工神经网络的基本原理和信息处理特征，并着重讨论了BP神经网络的算法原理和它在估计映射算子和模式识别方面应用的理论依据，为本次数据驱动的联合反演研究奠定了理论基础。

Based on analyzing disadvantage of URT′s passenger flow forecast by the joint mode split\ assignment model on all modes OD matrix, this paper presents a URT's passenger flow forecast with the joint mode split\assignment model on cooperant and competitive OD matrix Firstly, all modes OD matrix can be gained by trip production and distribution forecast Secondly, coopperant and competitive OD matrix can be achieved by layered and politic mod...

在分析基于全方式OD采用联合方式划分交通分配模型进行轨道客流预测不足的基础上，提出了一种基于合作竞争类OD的采用联合方式划分交通分配模型的轨道交通客流预测方法，即由出行产生和分布预测得到全方式的OD矩阵，通过分层次策略性交通方式划分法得到合作竞争类出行OD矩阵，然后采用联合方式划分交通分配模型进行轨道线网客流预测。

The equal rigidity design for the flexible joint of DTG is discussed in this poper,which derived the equations of calculating the axial and radial rigidity of two gimbal flexible joint inthis paper.

本文讨论了动力调谐陀螺仪挠性接头的等刚度设计，导出了双平衡环动调陀螺挠性接头轴向刚度和径向刚度的计算公式。

According to study and analyze the crab_like machine, this paper breaks the traditional joint model, making use of the three degree of freedom parallel mechanism, establishing the joint mechanism, and doing the kinematical and dynamical calculation for ...

通过对生物蟹关节的分析研究，本文打破传统的关节方式，利用三自由度并联机构的方法，建立了蟹关节的机构模型，并且对机构进行了运动学与动力学计算。

In this Paper the joint profile expression and fractal theory are reviewed, and the fractaltheory is used to study the frictional angle of the rock joint.

本文首先简要介绍节理形貌的描述方法和分形几何理论，然后将分形理论引人岩体节理摩擦角的研究中，得出了用分形维数表示摩擦角的经验公式。

This paper reviews the control theories used for robot in details. The interative and nonlinear torques of the traditional robots at the joint axis are reduced by a factor of gear ratio. The complicated arm dynamics is approximated to a linear, time-invariant model. The robot can be controlled by using local, decoupled PID's controller at each joint.

本文对机器人控制理论进行了全面综述，指出对于常规机器人，由于减速机构的存在，其耦合力矩和非线性力矩被大大减弱，其动力学模型可近似为线性、定常、解耦模型，采用独立关节PID控制即可。

Therefore it has all-importment significance for the further study in the product packing common technologyAccording to the idiographic demand of some modules,the paper groped technology of the design of waveguide window and packing,material with high thermoconductivity,completed the study of the seal joint in waveguide window and in module seal joint components,settled the puzzle in production,the technology target attained GJB548A-96 provisions.

本文根据某型模块的具体要求，探索窗口设计与封装、高热导材料封装技术，完成了波导密封窗口和模块密封部件的研究，解决了生产中的难题，技术指标达到了GJB548A-96的相关规定的要求。

A kind of self-closed joint used for two oil citcuit connect ions of underwater robot is introduced in the paper. The joint is composed of tw o members which are mounted in the tool and the wrist.

本文针对水下机器人在作业工具自动换接过程中的油路快速换接问题，提出了一种压差式快速自封接头，利用它可以在水中实现两液路的快速对接。

This paper analyse the influence on the torque and pre-tight forceof bolt, which is caused by the changing of friction factor, because the adhesiveagent is used in screw joint, and present some questions which must be noticedin screw joint when adhesive agent is used.

本文分析了螺纹连接中，使用粘接剂而引起摩擦系数的变化对螺栓拧紧力矩和预紧力的影响，提出了在螺纹连接中，使用粘接剂应注意的问题。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。