實驗描述:分布式數據庫的算法partition的具體實現。即通過該算法找到關系數據庫最優分裂點(2個),使得結果最優。 1、 首先根據所輸入的attribute usage matrix得到AQ( ) 2、 對CA矩陣中劃分點預先設在n-1處,并將屬性列分成3個集合,TA和BA和MA, 3、 確定集合TQ、BQ,MQ和OQ,其中TQ={ qj| AQ(qi) TA},BQ= TQ={ qj| AQ(qi) BA}, MQ={ qj| AQ(qi) MA},OQ=Q-{TQ BQ}。 4、 計算出CTQ、CBQ、CMQ、COQ這些值,其中CTQ= ,CBQ= ,CMQ= ,COQ= 5、 通過劃分點的第次移動分別計算出z=CTQ*CBQ*CMQ-COQ3 6、 對取到的z的最大值處標記,為分割點 7、 對CA進行調整,重復計算得到最終z的最大值點,對CA矩陣進行劃分 對上述算法進行修改,將得到的最大z值的分割點和次大的分割點都記錄下來,得到兩個分割,則將原有的屬性集劃分成三部分。
上傳時間: 2015-06-04
上傳用戶:515414293
電池設計的充電器 Device : AT90S2333 File name : BC.c Ver nr. : 1.0 Description : Standalone BAttery Charger with AT90S2333 (main program) Compiler : IAR icca90 Author : Asmund Saetre / Terje Frostad / Dietmar Koenig Change log : 02.02.2000 Changed to fit BAttery Charger refrence design board AS 18.02.2000 Final test and review AS
標簽: Description Standalone Device S2333
上傳時間: 2014-01-23
上傳用戶:ruixue198909
BAsic Compression Library by Marcus Geelnard Release 1.2.0 2006-07-22 Introduction The BAsic Compression Library is a library of well known compression algorithms implemented in portable ANSI C code. For more information about the BAsic Compression Library, please read the manual (doc/manual.pdf) and, of course, the source code.
標簽: Introduction Compression Geelnard Library
上傳時間: 2015-10-06
上傳用戶:
A general technique for the recovery of signicant image features is presented. The technique is BAsed on the mean shift algorithm, a simple nonparametric pro- cedure for estimating density gradients. DrawBAcks of the current methods (including robust clustering) are avoided. Feature space of any nature can be processed, and as an example, color image segmentation is dis- cussed. The segmentation is completely autonomous, only its class is chosen by the user. Thus, the same program can produce a high quality edge image, or pro- vide, by extracting all the signicant colors, a prepro- cessor for content-BAsed query systems. A 512 512 color image is analyzed in less than 10 seconds on a standard workstation. Gray level images are handled as color images having only the lightness coordinate
標簽: technique presented features recovery
上傳時間: 2015-10-14
上傳用戶:410805624
This file is used to simulate performance of the FMT system with different modulation method in BAseBAnd。(該程序主要實現FMT系統差分編碼下基帶誤碼率分析!)
標簽: performance modulation different simulate
上傳時間: 2013-12-27
上傳用戶:1427796291
This a simple hardware UART test program. It receives text lines over the serial port and writes BAck a status msg with length and contents of the buffer.
標簽: hardware receives program simple
上傳時間: 2015-10-19
上傳用戶:xlcky
三相步進電機的三相六拍工作方式,正轉的繞組通電順序:A、AB、B、BC、C、CA、A,反轉的通電順序:A、AC、C、CB、B、BA、B、A。 由于步進電機轉子有一定的慣性以及所帶負載的慣性,故步進電機的工作過程中不能及時的啟動和停止,在啟動時應慢慢的加速到預定速度,在停止前應逐漸減速到停止,否則,將產生失步現象。 步進電機的控制問題可總結為兩點: 1、產生工作方式需要的時序脈沖; 2、控制步進電機的速度,使它始終遵循加速、勻速、減速的規律工作。
上傳時間: 2015-12-01
上傳用戶:685
復雜網絡中,在BA網絡中最經典的路由算法matlab源程序并,是學習復雜網絡最基本的路由算法。
標簽: 復雜網絡
上傳時間: 2015-12-29
上傳用戶:anng
Floating Window.It is descendant of TCustomPanel. You can: - Drag on its title BAr. - Set title BAr on the left (only for truetype font) - Show/Hide buttons on title BAr - Expand/shrink window (like tool window in CorelDraw)
標簽: title TCustomPanel descendant Floating
上傳時間: 2013-12-20
上傳用戶:wendy15
robocup 的高層決策機構 if BAll is kickable kick BAll to goal else if i am fastest player to BAll and no opponent can intercept BAll intercept the BAll else move to strategic position and pos BA
標簽: BAll kickable robocup fastest
上傳時間: 2014-01-13
上傳用戶:1051290259