Research on the Bit Computation Model for Time Variable Channel Bandwidth

For the encoding bit-rate problem in H.264 wireless video communication,this paper analyzes the bit-rate computation model and the Mean Square Error distortion model,establishes the relation between the quantization parameter of the encoding bit-rate and the intra frame refresh rate of the macro block,and put forward a new ideal about the coding rate on the basis of general binomial computation model theory. Furthermore,this method not only can adaptively adjust the bit allocation and quantization parameter and prevents buffer from overflowing downward or upward under given network bandwidth,but also can apply the rate-distortion to optimize the solution method,control the encoding bits accurately and optimizes the allocation between the intra and inter frame encoding macro block.     

简单树结构存储系统数据分块标准及其证明

为解决传统磁盘阵列技术受系统总线与设备通道制约的问题,采用树结构和单元控制器构建了新型的存储系统.在树结构存储系统的基础上,通过对简单树结构存储系统数据分块方式的定义、推论,以及冲突系数的证明,给出了简单树结构存储系统的数据分块标准.结果证明:简单树结构存储系统数据分块标准能最大程度降低存储系统有效冲突系数,提升存储系统性能.     

韧性断裂机理的理论探讨与基于铝合金薄板韧性断裂准则的修正

对韧性材料的断裂机理进行理论研究.当裂纹尖端附近两个相邻的材料微单元体的破坏面共面或共线时,裂纹可以通过破坏面扩展并传递到相邻的单元;当两个单元体的破坏面与两单元体中心线成一定角度时,两单元体之间将产生相对滑动或旋转,使得两破坏面之间重新共面或共线,从而使得裂纹可以扩展,形成一个连续的裂纹开裂面.基于铝合金6063薄板修正韧性材料的断裂准则,并用简单的平面应力状态下的平板拉伸试验和平面应变状态下的缺口拉伸试验,结合有限元ABAQUS计算求得韧性断裂准则中的材料常数.     

Goal-Programming Model Based on the Utility Function of the Decision-maker

1 1ntroductionDeveloped by Charnes and Cooper['J in l960s, Goal-programming (GP) is a new branch ofOR for multiple--criteria decision-making problem. Because GP can be used to solve theproblems with several objectives which are generally in conflict, it has been widely appliedto quite different fields such as accounting, finance, marking, human resources,production, transportation, plant location, agriculture, etc.Considering some weakness of GP in the practical use, this paper presented t…     

民事诉讼证明标准再探析

民事诉讼证明标准是民事诉讼法的一个基本问题,对民事诉讼证明标准进行了界定,明确提出客观真实与法律真实是证明任务,不是证明标准,介绍了证明标准的类型和作用范围,并对我国民事诉讼证明标准的构建进行了初步设想.     

Study on the shock absorbing technique of high speed railway bridges

Based on the idea of "bearing function separation", a structural member called shock absorber that makes use of its plastic deformation is presented for reducing the seismic response of the bridge. The design criterion for matching material stress, strain and earthquake fortification aim, is also given. The analysis results show that the high speed railway box girder with the absorber in this paper has great reduction effect in seismic response of the bridge piers.     

泛函方程解的振动准则

给出某些泛函方程解的振动准则，所得结果推广了文献中的有关定理。     

考虑应变软化的圆薄板轴对称弯曲的极限荷载

本文以轴对称弯曲的圆薄板为例,详细讨论了考虑应变软化时确定极限荷载的方法,同时对极限状态的定义、中性面的确定、广义屈服准则成立的条件以及极限广义力的计算等问题进行了研究.算例表明传统的塑性极限分析方法用于应变软化材料夸大了材料的承载能力,将会产生不可忽视的误差.     

煤巷围岩稳定性综合分类及锚杆支护形式合理选择

提出一种围岩稳定性综合分类法，用此法研究平顶山矿区煤巷稳定性变化规律，得到了综合评价围岩稳定性的统计判据，可根据巷道条件及实测信息评价巷道稳定程度，并绘制出多指标围岩分类图。文中相应阐述了煤巷锚杆支护形式选择原则。