Channel coding is an important component in digital tv and determines dtv system ' s error correction performance and signal - to - noise rate ( snr ) threshold to a great extent . so it plays an indispensable role in settling the overall performance of a dtv system 信道编码在数字电视中是非常关键的部分，它很大程度上决定了数字电视系统的纠错性能及信噪比门限，从而对数字电视系统整体性能的好坏起到举足轻重的作用。
Before the bp neural net forecast fire size class , it needs a process of studying from sample data . the neural net adjusts the weight value and threshold value according to the sample so as to give the linking weight value and threshold to low the difference between output from itself and the expected value Bp网络在应用于预测预报之前，需要一个网络学习过程，网络根据输入的训练（学习）样本进行自适应、自组织，确定各神经元的连接权w和阈值。
Therefore , how to determine a proper trade - off line of materiality threshold to satisfy both the providers and users of accounting information is a critical subject in this research , because any failure will trigger the " expectation gap " , which may lead to a legal liability on providers of accounting information 然而，这条划分有限责任的重要性界线应当如何确定，才能同时满足会计信息供需双方的需要，是研究重要性判断时的主要课题。因为划分不当形成的“期望落差” ，可能给会计信息提供者带来法律责任。
With the latest emendation ordination of the 《 securities law 》 and 《 company law 》 in our country on january 1 , 2006 , the 30 % procurement exemption threshold to private capital economy which wants to procure will bring a new m & a trend . whether the m & a among business enterprises brings any conjunction effect as people expect 特别是我国最新修订后的《证券法》和《公司法》将从2006年1月1日起实施, 30 %的要约收购豁免门槛向民营经济的降低,为启动新一轮的企业并购打开便利之门。
The problems of boiler furnace flame detection that need to be resolved urgently are researched in this thesis , which are as follows : quick reduction of image noises , " peep flame " question , quick and accurate judgement based on dynamic - threshold to find out the on / off signal of the single burner flame , numeric evaluation of burner flame , temperature field reconstruction and image display in various ways 本文主要研究了在锅炉炉膛火焰检测中急需解决的下列问题：快速去除火焰图像中多种噪声干扰、偷看问题、基于动态阈值的单支燃烧器着火与否的准确及时判断问题、燃烧器火焰数值性综合评价问题、温度场重建及多形式显示问题。
Digital processing , high definition and standardization , a small quantity of storage are the main research fields we should pay more attention . the key techniques of this papery blueprints digital processing are comprised of four aspects , papery blueprint comprehension , compress storage , standardization and blueprint redraw . after scanning the blueprint into the computer , we adopt different threshold to do the threshold in the different area of the blueprint , this method will achieve best processing effect 对扫描后的图纸进行二值化处理,采用人工开窗的方式,对不同的区域,按图纸质量的差异采用不同的阈值进行二值化,使二值化的效果达到最佳,并根据需要对二值化后的图纸进行平滑、去噪等处理,为后续的图纸信息理解做好准备工作。
The first part of this paper discusses the preprocession of vehicle images . this part presents transfer of the format of images , the enhancement of images the edge detection of images and the bodywork dispose of vehicle . bring forward the images minus shadow technology base on threshold to apply to wipe off background of the vehicle 本文第一部分讨论了汽车图像的预处理，主要包括图像格式的转换，图像的增强，图像的边缘检测，汽车车体的处理，提出了采用基于阈值的图像减影技术在去除汽车背景的应用，实验结果表明此算法是十分有效的。
The switch power will operate at ccm condition when circuit is set to pwm mode . when pfm mode is selected for the operation mode , the switch power will still operate at pwm condition with the high load , the system will cancel the pwm mode and enter the pfm mode only when the load is drop to a certain threshold to boost the operation efficiency at light load , make the ic has high efficiency within wide load range 选择pwm模式,开关电源将工作在ccm模式下;选择pfm模式,在负载较高的情况下,开关电源仍然工作于pwm模式,只有当负载降低到一定程度时,开关电源才退出pwm模式,而按照pfm工作模式操作,跨过一部分时钟周期,降低频率相关功耗,以提高轻负载时低效率的问题,使得开关电源在很宽的负载范围内都具有高效率。
Output can be obtain , next we use our designed the wavelet soft threshold to select result of the wavelet transform , finally , we give the selected result reversal wavelet transform . it is obvious : the wavelet soft threshold is important to improve the quality of the gray image processing . . i give the donoho wavelet soft threshold a modified value method , which has a relation with ratio of signal - noise . i made full use of discrete hop field single feedback neural network , and nonlinear steady of automatic system at last , i obtained a steady limited ring , give the energy function an order differential a optimal 我的思路是：改造现有图形结构，先建立能反映信噪比大小且含待定参数k的表达式，然后通过离散型h0pfi旧单层反馈神经网络，再结合前边的混合滤波器构成一个非线性控制系统，写出对应的网络函数，利用相平面法和李雅普诺大稳定性的判据，得到一个稳定的极限环，从而确定出参数卜的范围，进而再对原来的小波软阈值进行修正，用修正后的值作为小波阈值。
