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K. A. Ross,C. Jensen,R. Snodgrass,C. Dyreson,Spiros Skiadopoulos,Cristina Sirangelo,M. Larsgaard,G. Grahne,Daniel Kifer,H. Jacobsen,H. Hinterberger,Alin Deutsch,Alan Nash, K. Wada,Wil M.P. van der Aalst,P. Mitra,I. Witten,Bing Liu,C. Aggarwal,M. Tamer Özsu,Chimezie Ogbuji,Chintan Patel,C. Weng,Adam Wright,Amnon Shabo (Shvo),Dan Russler, R. Rocha,Y. Lussier,James L. Chen,Mohammed J. Zaki,Antonio Corral,M. Vassilakopoulos,D. Gunopulos,Dietmar Wolfram,S. Venkatasubramanian,M. Vazirgiannis,I. Davidson,Sunita Sarawagi,L. Peyton,Gregory D. Speegle,V. Vianu,D. V. Gucht,Opher Etzion,F. Curbera,AnnMarie Ericsson,Mikael Berndtsson,J. Mellin,P. Gray,Goce Trajcevski,O. Wolfson,P. Scheuermann,C. Dorai,Michael Weiner,Alexander Borgida,J. Mylopoulos,Gottfried Vossen,A. Reuter, V. Tannen,S. Elnikety,A. Fekete,L. Bertossi,F. Geerts,W. Fan,T. Westerveld,C. Gurrin,Jaana Kekäläinen,Paavo Arvola,Marko Junkkari,K. Mouratidis,J. Yu,Yong Yao,J. Gehrke, S. Babu,N. Palmer,C. Leung,Michael W. Carroll,A. Gokhale,M. Ouzzani,Brahim Medjahed,A. Elmagarmid,S. Manegold,Graham Cormode,Serguei Mankovskii,Donghui Zhang,T. Härder,Wei Gao,Cheng Niu,Qing Li,Yu Yang,Payam Refaeilzadeh,Lei Tang,Huan Liu,T. Pedersen,Konstantinos Morfonios,Y. Ioannidis,Michael H. Böhlen,Lei Chen

Encyclopedia of Database Systems（2009）

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Correspondence Address: (57) ABSTRACT CARLSON, GASKEY & OLDS, P.C. 4OO WEST MAPLE ROAD SUTE 350 BIRMINGHAM, MI 48009 (US) Brushed DC electric motors have a rotor with commutator portions moving into and out of contact with brushes. As each of these contacts end, a back EMF force is induced into a main current Supply signal. The number of these periodic (73) Assignee: Masco Corporation forces can be counted and utilized to identify the position of (21) Appl. No.: 11/134,925 the component being rotated by the DC electric motor. This method is relatively insensitive to environmental changes, (22) Filed: May 23, 2005 and thus more accurate than the existing art.

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