ssd2 exercise答案.docx
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ssd2 exercise答案.docx
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ssd2exercise答案
exercise1
Question1
A:
a.yourfriendJenisanativeFrenchspeakerwhohasimmigratedtotheUnitedStatestoteachFrenchinhighschool.Shepaysspecialattentiontoherstudents’pronunciationandworksveryhardtoshowherstudentshowtopronouncewordscorrectlyinFrench.Knowingthatyouaretakingacourseincomputersystems,sheasksifyouknowofanycomputertechnologythatcanhelpherstudentslearntospeakaforeignlanguagewithcorrectpronunciations.Whatwouldbeyourresponsetoher?
Dear,jen
Ihaverecixeyourletter.IknowyouhavesometroubleinhowtoshowyourstudentscorrectlyinFrench.
Therearetwocomputersoftwaremaybeusefultoyou.Thefirstoneisthehowtopronouncewords“TheTalkingHead”,itisasoftwarecanbeusedinlanguagetraining.TheTalkingHeadrealisticallysimulatestheheadofahumanbeing,withacomputer-synthesizedvoicethatsoundshuman-like.Thevoiceofthetalkingheadisverylifelike.Ithinkitwillgiveyourstudentsmorechancetoexercisetheirspoken—french.ThesecondsoftwareisFluency:
Automaticforeignlanguagepronunciationtrainingsoftware.Itcaninterpretpronunciationsandprovidefeedbackonhowwepronounceawordandhowtocorrectthepronunciations.Ithinkitwillhelpyourstudentexercisethepronunciation.
Bestwishes!
Yours
ZhaoGuoping
B:
Yourunclehasworkedfor30yearsasasalesrepresentative.Hehasaccumulatedover10,000businesscardsthroughouthiscareer.Hekeepsastackofnotebookswherehewritesdowneachcustomer’scontactinformation,profile,andspecialinterests.Whenmakingcustomercontacts,hespendsalargeamountoftimetryingtoidentifythetargetgroupofcustomers.Describeaneasierandfasterwayoforganizingtheinformationhehascollectedmakinguseofavailabletechnology.
IsuggestmyuncleuseCustomerrelationshipmanagementsoftware.ACRMsoftwaresystemcancollectinformationaboutcustomerdemographics,andinvestigatecustomer-purchasingbehaviorswiththeobjectiveofpredictingcustomerneedsandincreasingrevenues.So,IthinktheCRMsoftwarewarehelpsmyuncleorganizingtheinformationhehascollected.
C:
YourfriendAlexistaskedtogenerateanumberofseriesofpostersofthesamepicturevaryinginpostersize,colortone,andlayoutforaclassprojectduein5hours.Heisveryfrustratedbecauseeachposterdesignwouldtakehimabout3hourstoproducewithcolorpencils.Howcouldsoftwarebeusedtosolvethisproblem?
ShecanuseGraphicssoftware.Itisdesignedtohelpcreate,manipulate,andprintgraphics.HereIwillgiveherfivesoftware,Paintsoftware、Photoeditingsoftware,Drawingsoftware,3Dgraphicssoftware,CADsoftwareandPresentationsoftware.Ithinkthissoftwarewillhelphertosolveherproblems.
Question2
A:
a.Completethefollowingchartbyconvertingthenumbersgiveninoneofthenotationstotheothertwo.Showcalculations.
Binary
Decimal
Hexadecimal
1010101
85
0x55
1100110
102
0x66
1111
15
0x F
11111010
250
0xFA
10101111
175
0xAF
110110110
438
0x1B6
B:
Whatistheminimumnumberofbitsthatcanbeusedtorepresentthedecimalnumber213?
(Hint:
convert213tobinary.)
8bits
C:
Whatistheminimumnumberofbytesthatcanbeusedtorepresentthedecimalnumber213?
1byte
D:
Whatisapurposeofusinghexadecimalnotation?
IttakesmoredigitstoexpressavalueinbinarynotationthaninHexadecimalnotation.AndComputerprofessionalshaveadoptedhexadecimalnotationasshorthandforbinarysothattheycanexpressbinaryvaluesmoreconcisely.
E:
WhatisASCIIcode?
AmericaStandardCodeforInformationInterchangecode.
Question3
YoucanobtainthebinaryrepresentationofawordbyconcatenatingtheASCIIvaluesofeachletter.Forexample,“SSD2”inbinaryrepresentationis010100110100010000110010.
a.“Fun”inbinaryrepresentationis01000110 01110101 01101110.
b.“Play”inbinaryrepresentationis01010000 01101100 01100001 01111001,whichisequivalentto1349280121indecimalrepresentation.
c.01100011011000010111001001100101011001010111001001110011isthebinaryrepresentationoftheASCIIstringcareers.
d.0x7374617274isahexadecimalrepresentationoftheASCIIstringstart.
e.1751478885isthedecimalrepresentationoftheASCIIstringhere.
7:
43 |添加评论 |固定链接 |写入日志 |计算机与Internet
Mainboard
Mainboard
Briefintroduction:
Themainboardisoneofthemostimportantpartsinthecomputer,andthefoundationthatthewholecomputerworks.Ingeneral,themainboardismadeupbyseveralfollowingparts:
MemoryslotofCPUslot[thesocket],high-speedlandbus,officeofbuffermemory,expandbusharddisk,floppydrive,clustersofmouth,andsubstandardtosetupinterfaceclockandCMOSmainboardBIOScontrolthechipmouth.
Memoryslot:
Letmecometoseememoryagain,thememorycanbedividedintotwokinds,oneisRAM,namedandreadandwrittenthememoryatrandom,canreadandcanwrite,thecontentcan'tbekeptaftercuttingout.AnotherkindisROM,calltheread-onlymemory,canonlyreadandcan'twriteinto,thecontentwillnotbelostaftercuttingout,thisBIOSchiponthemainboardisROMchip;PresentBIOSchiponmostmainboardsusesFLASHROM,canwipeROMwrittenwiththesoftware,canbewrittenintothecontentunderhighervoltage,thisBIOSchiponthemainboardis.TherearemanykindsofRAM,thecommononeisdynamicRAMandstaticRAM. Wesayusuallyhowmuchmemorythecomputerisfurnishedwith,itisdynamicmemorytopoint.Here,wemainlyhavealookattheslotoftheregularmemory,therearetwokindsofmainlytousetroughsofoneofregularmemoryonthemainboardatpresent,themostnew-typeoneiscalledDIMMtrough.ThereistheoneabitolderthatiscalledSIMMtrough.
HashadmemoryofDIPandSIPtype,theyallinsertpullingouttype,itisapttocausedamaging,nowhasalreadybeeneliminated.DIMMpresentmainboardsoftheaboveofsurgingforwardwillallofferDIMMtrough,itisLine168,usedforinstallingSDRAM.SDRAMChinesemeaningisthesynchronousdynamicmemory,ithasongoodtermserperformancethanordinaryDRAM.DIMMmemoryshouldinsertthememoryinthesocket,thecardreedtobepushedbothsideswhileremovingverticallywhileinstalling,thememorywillhavebeenliftedoutthesocket.Shouldpulloutwithhandhelpwhenthesocketistootight,soasnottodamagethecardreed.ThoughSIMMoffermainboard,SIMMoftroughseeseldomalreadynow,butwecan'tyetforgetthispersonmake"friend"ofgreatmeritforcomputerdevelopmenttemporarily.
SIMMtroughsthatcanseenowareallLine72,andusually4.BothendsofSIMMtroughhavespringslice,playthefunctionofoneoftheregularmemory.ItisveryeasytoinstallSIMMmemory,inlaysmouthsintheoneofone'sendofmemory,socanonlyinstallinacorrectway,putslopingintothenotchit,thenpushtothecorrectposition,theclipofbothendswilllockit.ItmustpushthecardreedinbothsidestoremoveSIMMone.Buffermemory:
UsuallyCachethatpeoplesayreferstobuffermemorySRAM.SRAMcallsthestaticmemory,"staticbehavior"ismeantafterwewriteasumofdataintoSRAM,unlesswriteintothenewdataorclosethepoweragain,thedatawrittenintokeepintact.
BecausethespeedofCPUismuchquickerthanthespeedofthememoryandharddisk,willmakeCPUwaitwhiledeposittingandwithdrawthedata,influencethespeedofthecomputer.TheaccessofSRAMisallquickerthanothermemoryandharddiskinspeed,soitisusedasthehigh-speedbuffermemory(Cache)ofthecomputer.
Thereishigh-speedbuffermemory,canwritethedataamongtheminadvancefirst,readfromitdirectlywhileneeding,thishasshortennedthewaitingtimeofCPU.Itisonthebasisofakindofstatisticslawthatthehigh-speedbuffermemorycanimprovethesystematicspeed,controlsystemofmainboardwillwhichdatacanfrequentuseintheautomationstatisticalmemory,storethesedatainthehigh-speedbuffermemory,whenCPUshouldvisitthesedata,lookforwhenwillreachCachefirst,thusimprovethespeedofoperationofthewhole.Generallyspeaking,thehigh-speedbuffermemoryof256Kcanmakethespeedofthecompletemachineimprovebyabout10%equally.
Willallusuallyoffer256Kbuffermemoryto1Monthemainboards.Thereishigh-speedbuffermemorytoowithinCPU,forinstance,486CPUhashigh-speedbuffermemoryof8K,Pentiumhashigh-speedbuffermemoryof16K.PentiumIIhas32Kfirstclassbuffermemory,thereisfirstclassCacheof64KinAMDK6-2,thereisfirstclassCacheof64KinAMDK6-3,withsecondCacheof256K,thereisCacheof64KinCyrixMII
ThebusandCPUtemperaturesurveythedevice
Bus
Sumup:
BesidesCPUtypesupported,thesecondimportantcharacteristicofthemainboardisatypeofthebus.Theso-calledbusjoinsCPUandmemory,buffermemory,outsideandcontrolsthedatapasswayamongthechip;Therearedatapasswaysbetweenthetroughstocontrolthechipandexpand,isnamed:
Expandbuses,orsomebus.Expandthefunctionthatthebusallowsuserstoexpandthecomputerthroughinstallingthenewexpansioncard.Forexampleyoumightthinkinstallationsoniccardisitincreasevoicefunctiontocome,installationnetworkcardcomestojointhenetwork.Themoreexpansiontroughsonthemainboardare,themoreexpansioncardsthatuserscaninstallare.Usuallyeachmainboardoffers5-8toexpandthetrough,theymaybedifferentbustypes.Expandtohaveneedle,withinsertconne
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