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Symbian+OS环境中用活动对象处理非抢占式多任务的安全性分析(6)

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Symbian+OS环境

第3期

赵镜红,等:未知负载和转子电阻的交流感应电机自适应控制

feedbackcontrolofinductionmotorswith

rotor

.551.

output

[4]Kwan

of

M,LewisFL,YeungKS.Adaptivecontrol

motors

without

flux

measurements.

uncertain

resistance.IEEETrans.Automatic

induction

Control,1999,44(5):967—983

Automatica,1996,32(6):903—908

AdaptiveControlofInductionMotorswith

UnknownLoadandRotorResistance

ZhaoJinghong

ZhangJunhong

(SchoolofElectricalandInformationEngineering,NavalUniv.of

Engineering,Wuha咒430033)

Abstract

AnobserverbasedadaptivecontrollerisdesignedforvariablespeedthreephaseACinductionmo—

tors.Theproposedcontrollerallowsforsimultaneousandindependentcontrolofthe

speed(torque)andthefluxofthemotorwithoutrequiringthemeasurementoftheflux,andwithouttheknowledgeoftherotorresistanceandthemotorload.Thecontrolleradaptivelyestimatesthefluxvariablesandtheunknownparameters,usingonlythemeasuredspeed,voltageandcurrent

signals.Thecontrol

strategynot

isdesignedfortheequivalenttwophasefieldorientedmodelofthemotor.Therefore,itdoes

havestiffnonlinearitiesand,hence,itissuitableforthediscretizationand

digitalimplementation

withDSPs.

Keywords:inductionmotor;rotorresistance;adaptivecontrol;fluxobserver

 

‘+____—+斗_—p—¨_-+___—-_H—+_—H-+H—+—¨_Hh+—P__一—+—h++_—H—+H呻H—+—+.+

(上接第539页)

[6]聂伟强,熊剑,严隽.在SymbainOS环境下用活

Is]钮雪莲,凌力.Symbian系统平台安全性分析与改

进.计算机工程,2006,4(32):194—196

动对象处理非抢先式多任务.科技广场。2005(3):84—

85

Research

on

SecurityofUsingtheActiveObjects

to

DealwithNon—-preemptive

LiShun

Multitasking

Wei

ChenShi

inSymbianOS

Chen

(Schoolof

Information

Engineering,W,U丁,Wuhan430070)

Abstract

Thispaperdiscusses

specialthoughtwhich

uses

theactiveobjects

to

dealwithnon-preemptive

current

ca-

multitaskinganddiscussesproblemsabouttheplatformsecurityinSymbianOSthatisthe

popularoperationsysteminthemarketofsmartphone.Itinterprets5sectorsofsecurityincluding

pability,permission,authorization,secureidentifieranddataCaging.3basic

concepts

are

analyzed

includingactiveobject,non—preemptivemultitaskingandasynchronousfunction.Analysisiscar“ed

OuttO

theprocessofprocessingfromtheSecurity.Itresolvestheproblemabout

current

OSofsmart

phonefromtWOaspects:alittlememoryandtheplatformSecurity.

Keywords symbianOS;platformsecurity;activeobject;non—preemptivemuhitasking

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