查询词典 drift avalanche

In a database the concept of an example might change along with time which is known as concept drift When the concept drift the classification model built by use of old data is unsuitable for classify new data Therefore concept drift has become a hot issue in data mining in recent years Although many algorithms had been proposed to resolve this problem they can not provide users with the reason of concept drift However a user might be very interested in such rules For example doctors want to find what makes disease change; researchers want to know the reason of the variety of the weather; and decision makers would like to understand why a customer's shopping habit change In this thesis we propose a Concept Drift Rule mining Tree called CDR-Tree to solve this problem CDR-Tree can not only find the rule of concept drift also build the prediction model for both old and new data at the same time

无论在大型资料库或现实生活中，同一资料样本的概念有可能会随著时间的递移而改变，也就是产生所谓的概念漂移。当样本发生概念漂移时，由旧有资料所建构的分类模组将不再适用於预测新获得的资料，因此，近年来概念漂移已成为资料探勘中一项热门的研究议题。虽然已有？多学者提出不同的技术来解决概念漂移的问题，但是这些方法都是利用修正或重建的方式来产生适合新资料的预测模组，并无法提供造成概念漂移的原因。然而对使用者而言，其感兴趣的可能正是这些引起概念漂移的规则，如医生可能想了解引起疾病变化的主因、学者会想要知道气候转变的规则、或是决策者想找出顾客购物习惯改变的因素等。因此，本论文提出概念漂移规则探勘树( Concept Drift Rule mining Tree )，简称CDR-Tree，来解决这个问题。CDR-Tree不但能探测出造成概念漂移的主要原因，亦能同时建立新旧资料的预测模组以供决策者运用使用。

The experiment shows that,there is phase drift of low frequency in the digital image seriel acquired by CCD camera and frame grabber,different CCD has different drift characteristic and level;the phase drifts are not identical even in the same image line,the phase drift of neighboring locations in an image line has distinct correlation;the drift levels ...

实验表明：经 CCD Camera和图像卡采集的数字图像序列中存在着低频的图像抖动，即位相漂移。而且不同的 CCD Camera具有不同的漂移特点和程度，甚至在同一个图像行内的漂移也不完全一致。一般在图像行内相近的位置之间，位相漂移有明显的相关性，不同的图像行之间的漂移的程度相同，但没有相关性。最后本文还给出了一种位相漂移的修正方法

The main work and achievements are as following:An overview of gyros drift is presented. Its cause is analyzed and it is categorized into three types: constant drift, slope drift and random drift.

主要的工作及完成的任务如下：首先对陀螺仪的漂移进行了概述，分析了其产生的原因，并把它分为三种：常值漂移，斜坡漂移及随机漂移。

The invention discloses a high-voltage P-type metal oxide semiconductor, including a P-type substrate, a deep N-well is arranged on the P-type substrate, an N-well drift region and a P-type drift region are arranged on the deep N-well, an N-type contact hole, a P-type source and a field oxide layer are arranged on the N-well, a P-type drain and the field oxide layer are arranged on the P-type drift region; the invention is characterized in that the thickness a grid oxide layer part which is positioned above the N-well is smaller than the grid oxide layer part which is positioned above the P-type drift region and a thin grid oxide layer and a thick thin grid oxide layer are respectively formed accordingly.

本发明公开一种高压P型金属氧化物半导体管，包括P型衬底，在P型衬底上设有深N型阱，在深N型阱上设有N型阱和P型漂移区，在N型阱上设有N型接触孔、P型源及场氧化层，在P型漂移区上设有P型漏及场氧化层，其特征在于位于N型阱上方的栅氧化层部分的厚度小于位于P型漂移区上方的栅氧化层部分并由此分别形成薄栅氧化层和厚薄栅氧化层。

The invention discloses a high-voltage N-type metal oxide semiconductor, including a P-type substrate, a P-well drift region and an N-type drift region are arranged on the P-type substrate, a P-type contact hole, an N-type source and a field oxide layer are arranged on the P-well, an N-type drain and the filed oxide layer are arranged on the N-type drift region; the invention is characterized in that the thickness a grid oxide layer part which is positioned above the P-well is smaller than the grid oxide layer part which is positioned above the N-type drift region and a thin grid oxide layer and a thick thin grid oxide layer are respectively formed accordingly, a P-type impurity injection region is arranged in the P-well, and the P-type impurity injection region is positioned below the thin grid oxide layer.

本发明公开一种高压N型金属氧化物半导体管，包括P型衬底，在P型衬底上设有P型阱和N型漂移区，在P型阱上设有P型接触孔、N型源及场氧化层，在N型漂移区上设有N型漏及场氧化层，其特征在于位于P型阱上方的栅氧化层部分的厚度小于位于N型漂移区上方的栅氧化层部分并由此分别形成薄栅氧化层和厚薄栅氧化层，在P型阱内设有P型杂质注入区且该P型杂质注入区位于薄栅氧化层的下面。

Chapter 4 presents five design criteria of S-boxes of block ciphers, develops a method of constructing large S-box by use of algebraic group operation, proves the balance property of these large S-box, tests the strict avalanche and independence of avalanche variables properties of S-boxes in NEA cipher, analyses the nonlinearity and best linear approximation of the S-box, and finally defines the differential of input/output of S-boxes of this cipher and analyses the distribution of them.

第二部分即第三章，提出了一种新的分组密码类NEA(NEA-4A，NEA-8A，NEA-4B，NEA-8B)，完整地描述了该密码类的加解密过程和密钥协议；证明了NEA-4B和NEA-8B的完全对合性和没有不动点的性质；分析了该密码类的安全特征；具体地介绍了实现该类密码的途径；给出了NEA-4A的计算机C语言程序和样本数据。

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The principle is using thefast breakover of avalanche transistor drive the electron tube. The full time of 4200Vvoltage is about 20ns. The circuit can normally work under 100kHz frequencies.Design an extra fast Q-switch circuit by series arrangement of avalanche transistor.

本论文主要做了以下几方面工作：1、推导了重复率激光基本参数(脉冲能量、脉冲宽度和峰值功率)与周期的关系，并且分析了重复率激光系统运转的稳定性。2、设计了雪崩管-电子管退压电路，由雪崩管驱动电子管开关，4200V高压退压沿20ns左右，能够在100kHz频率下工作。

The threshold of lithium tantalite under single-shot is found to be 1.84J /cm 2 and the avalanche rate was determined to be 1.01 cm 2 /J by calculation. We found that avalanche dominates the ablation process, while photoionization serves as a free electron provider.

在800nm飞秒激光脉冲作用下，钽酸锂晶体单脉冲烧蚀阈值为1.84 J /cm 2；在此基础上，我们通过建立钽酸锂晶体中导带电子密度演化微分方程，并数值求解，得到了钽酸锂的碰撞电离速率系数为1.01 cm 2 /J ，并得出在钽酸锂表面烧蚀中，光致电离提供种子电子，雪崩电离起主导作用的结论。

The RECCO AVALANCHE RESCUE SYSTEM utilizes advanced radar technology to make a quick location of an avalanche victim possible.

RECCO 雪崩搜救系统应用最新雷达技术，快速确定雪崩中可能遇难者的位置。

They experience feelings deeply and intensely, and their emotions are often mercurial.

他们的感情深刻而强烈，情绪善变。

Surrounded with or as if with a rampart.

用城墙围绕的用城墙围绕的或类似于为城墙围绕的