查询词典 dem

Earthworks zero line is determined by constructing the spatial gridding curved surface model of the original terrain and the field leveling design terrain by digital elevation mode. The DEM data of original terrain are obtained by actual measurement. The mathematical correlation is deducted to demonstrate the relationship between the coordinates of any point on spatial line and the direction cosine by the spatial linear equation. DEM data obtaining program is compiled by Fortran9.0 and it is applied automatically to obtain the DEM data of field leveling design terrain.

目的 利用数字高程模型(digital elevation model， DEM)构造原始地形和场平设计地形的空间网格曲面模型，确定土方工程中的零线方法通过实测提取原始地形DEM数据；依据空间直线方程，推导空间线段土任意点的坐标与方向余弦的数学关系式，采用Fortran90程序设计语言编写DEM数据提取程序，自动提取场平设计地形DEM数据；应用Surfers8.0和MapInfo软件构造规则的网格空间曲面模型并导出网格节，点数据；擦除场平设计范围外数据。

DEM Edit is the key process of the DEM data produce. Based on the analysis of the DEM data Error, this paper using the lowpass filtering method to eliminate the Random Error of DEM data, using the partial slope information detection and whole trend surface detection to detect DEM Gross Error.

DEM编辑是DEM数据生产的重要环节，本文在分析DEM数据误差的基础上，采用低通滤波的方法降低随机误差的影响，利用局部坡度信息和整体趋势面方法，实现DEM粗差的自动检测。

Welcome to Jamrock, camp where the thugs dem camp at Two pounds a weed inna van back It inna u handbag, u knapsack, it inna u backpack The smell a give your girlfriend contact Some boy nuh know this, dem only come around like tourist On the beach with a few club sodas Bedtime stories, and pose like dem name Chuck Norris And dem don't know the real hardcore Cause Sandals a nuh Back-to, the thugs dem have do what dem got to And won't think twice to shot you Don't make them spot you, unless you carry guns a lot too A pure tuff things come at you When Trenchtown man stop laugh and block-off traffic Then dem wheel and pop off and them start clap it With the pin file dung and it a beat rapid Police come inna jeep and them cant stop it Some say dem a playboy a playboy rabbit Funnyman a get dropped like a bad habit So don't bother pose up if you don't have it Rastafari stands alone!

欢迎来到Jamrock暴徒在营外、dem营地两磅inna杂草。范它inna u型手提袋、你背包，它inna你的背包给你的女朋友的气味了接触一些男孩nuh知道这个，像只来旅游在沙滩上有一些俱乐部苏打水读床边故事，并且喜欢dem名字查克·诺里斯与dem不知道真正的核心原因是nuh凉鞋，暴徒场上dem已经做dem得而不会考虑到击中了你别让他们点你，除非你带枪一个纯净的艰难的事情来当Trenchtown人停止笑和block-off交通然后dem车轮和流行，他们开始拍它将文件，这一打粪便迅速警察来inna吉普车和他们不能阻止它有些人说dem花花公子一个花花公子的兔子《一拿到落下，像一个坏习惯所以不要打扰构成了，如果你不拥有它曾经独自站！

For reducing boundary distortion area, the elevations of grid DEM are viewed as a discrete sequence under a generalized coordinate, so that the boundary problem of two-dimensional discrete wavelet transform is turned into the boundary problem of one-dimensional discrete wavelet transform, which not only greatly reduces the boundary distortion area, improves the precision of reconstructed DEM data near the boundary, but also decreases the number of zeros adding on the boundary for wavelet transform, and boosts the compression ratio. On the basis of analyzing the distribution characteristics of coefficients in low and high frequency bands, a mixed entropy coding plan is applied, and a high efficient quantizator called"self-adaptive hard threshold"is established, which is helpful for improving the precision of the reconstructed DEM data and for enhancing compression ratio.

为了减小小波变换山区格网DEM数据压缩中边界失真区域，将山区格网DEM高程值视为广义坐标下的离散随机序列，把二维离散小波变换中的边界问题转换为一维离散小波变换中的边界问题，不仅大大减少了小波变换边界失真区域，提高了重构DEM数据边界点的精度，而且减少了边界补零个数，提高了压缩比；通过对山区格网DEM数据小波变换低频区和高频区变换系数分布特点的分析，采取了霍夫曼—游程混合熵编码方案，设计了高效、低失真的"自适应硬阈值"量化器，即对低频区变换系数不进行量化，直接进行霍夫曼编码；对高频区变换系数则先用"自适应硬阈值"方法量化处理，再进行游程编码。

Hybrid schemes in a KEM-DEM structure is regarded as the most natural approach to public key encryption with IND-CCA security and practical efficiency. Traditional KEM is realized by public key scheme, which only provides confidentiality security for session key used by DEM. In 2005, combining the idea of signcryption with the KEM-DEM model hybrid encryption, Alexander proposed a signcryption KEM-DEM model hybrid signcryption primitive.

KEM-DEM结构的混合密码体制是获得IND-CCA安全最实际有效的方法，传统的KEM由公钥加密方案实现，仅提供DEM使用的会话密钥的保密性安全。2005年Alexander等人将签密的概念与KEM-DEM结构的混合密码体制相结合，提出了Signcryption KEM-DEM结构的混合签密。

For the unsuitabihty of the Tag-KEM/DEM to be used as multi-message hybrid encryptions, a new hybrid paradigm, KEM/Tag-DEM, is proposed with its security proof. For the corresponding multi-message hybrid paradigm, KEM/Tag-SKE, security is also proved. Two constructions for IND-CCA secure Tag-DEMs are proposed with the security proof.

6鉴于Tag-KEM／DEM不宜用作多消息混合加密，提出一种新的混合加密范例KEM／Tag-DEM，证明了它作为一次混合加密时的安全性，以及对应的多消息混合加密KEM／Tag-SKE的安全性，给出了两种构造Tag-DEM的方法并证明了安全性。

However, each kind of DEM error existence varying degree reduced the analysis and the application result confidence level.

分析了用地形图生产DEM的误差来源，简要介绍了DEM精度评定的途径和方法及DEM质量检查的内容及DEM质量的评价法则。

Results:Normal segment:DEM 8.89±1.21mm,VDEM2.30±0.76cm/s;Hypokinetic segment:DEM 4.56±0.53mm,VDEM 1.89±0.35cm/s;Akinetic segment:DEM 2.13±0.45mm,VDEM 0.95±0.07cm/s.There was a significant overall difference in DEM and VDEM (P0.0001)among wall motion grades.1/3 VDEM was greater than 2/3 VDEM in normal(P0.0001)and hypokinetic(P0.05)segments,though 1/3 VDEM was slower than 2/3 VDEM in akinetic segments(P0.0001).There was also high correlation between 1/3 DEM and 1/3DEMF in both normal(r＝0.81,P0.0001,y＝0.75x＋0.16)and OMI(r＝0.91,P0.0001,y＝0.74x＋0.10)groups.Conclusion:Analysis of color kinesis image can quantitatively assess regional and global diastolic function.

结果：运动正常节段：DEM8.89±1.21mm，VDEM2.30±0.76cm/s；运动减弱节段：DEM 4.56±0.53mm，VDEM1.89±0.35cm/s；运动消失节段：DEM2.13±0.45mm，VDEM0.95±0.07cm/s；三种不同室壁运动状态间的DEM、VDEM均存在显著性差异PDEM显著快于2/3VDEM(4.56±1.18cm/s vs 1.26±0.34cm/s，PDEM略快于2/3VDEM2.14±0.66cm/s vs 1.76±0.47cm/s，PDEM显著低于2/3 VDEM(1.23±0.52cm/s vs 1.37±0.30cm/s，P结论：彩色室壁运动技术能定量评价左室局部和整体舒张功能。

Discuss the key arithmetic of surface correction and line correction in correct the DEM Gross Error of the different geography appearance such as water area, hill area and Loess Gully area.4. Bring forward the conception of keep the terrain feature of DEM Edit, and pointer solves two key technologies: The DEM data 3D fluency explores and quick pick up.

提出了保持DEM地形特征编辑的概念，并重点解决了地形特征编辑中的两个关键技术：DEM数据的快速显示和空间三维数据的快速选取和反馈，并实现三维环境下实时的人机交互操作。

Secondly, two physical models were constructed, which could model rough surface and describe the features of the earth surface, such as chine, neck, valley and hill, etc. According to difference method, the ""true"" volume of the physical models were measured, which was 13260cm3 and regarded as the analysis foundation of the precision of the volume that was calculate by DEM. The discrete dada of the models on a regular spacing of 1cm were collected by 3SPACE FASTRAK and the DEM was obtained by interpolating the discrete dada through GIS software. Based on the volume of the models calculated by DEM, different interpolating methods (IDW, Spline, Natural Neighbor, and Kriging) and variation of grid spacing of data were compared and their effects on precision of volume calculation were analyzed.

构建了可模仿凸凹不平地形表面的实体模型，该模型能够表征山脊、山尖、山涧、丘陵等地形特征；根据体积差减法测量实体模型的体积作为数据精度分析的体积&真值&，该值为13260cm~3，作为采用DEM进行体积计算的基准值；利用精度为0.08cm的三维数字化仪采集间距为1cm的离散数据点，对离散数据点用GIS软件进行内插处理生成DEM模型，通过DEM计算出模型的体积，探讨不同内插方法(IDW、Spline、Natural Neighbor和Kriging)和数据格网间距变化对体积计算精度的影响。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。