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Information coding



Meaning

Incommunicationtheory,codingisthetransformationoforiginalinformationsymbolsaccordingtocertainmathematicalrules.Thepurposeofencodingistoenableinformationtobetransmittedtothesinkasquicklyaspossiblewhileensuringacertainquality.Incommunication,therearegenerallytwoproblemstobesolved:oneishowtouseasfewsymbolsaspossibletotransmitinformationundertheconditionofnodistortionorallowingacertaindegreeofdistortion.Thisisasourcecodingproblem;second,thereisinterferenceinthechannel.Next,howtoincreasetheanti-interferenceabilityofthesignalwhilemaximizingtheinformationtransmissionrateisachannelcodingproblem.Thesourcecodingtheorem(Shennon'sfirsttheorem)givesthepossibilitytosolvethepreviousproblemandalsoanencodingmethod;thenoisychannelcodingtheorem(Shennon'ssecondtheorem)pointsoutthatthereissuchaEncoding,whichcanmakethetransmissionerrorprobabilityclosetothechannelcapacity,thusgivingthepossibilityofsolvingthelatterproblem.Therefore,theuseofcodingmethodsincommunicationcanminimizetheeffectsofdistortionandchannelinterference,andatthesametimecantransmitinformationataninformationtransmissionrateclosetothechannelcapacity.

Function

1.Identificationcodeistheuniqueidentifieroftheidentificationinformationclassificationobject.

2.ClassificationWhentheclassifiedobjectsareclassifiedaccordingtocertainattributes,acodeisdesignedforeachcategory.Atthistime,thecodecanbeusedasanidentifiertodistinguishtheobjectcategory.Thiskindofmarkingrequiresaclearstructureandnoambiguity.

3.SortingSinceallsymbolsinthecodehaveacertainorder,itisconvenienttosorttheminthisorder.

4.SpecialmeaningDuetocertainneeds,whensomespecialsymbolsareusedtorepresentspecificthingsorconcepts,thecodeprovidescertainspecialmeanings,suchasthetechnicalparametersandperformanceindicatorsofcertainclassifiedobjects.

Purpose

Thepurposeofinformationcodingistoestablishaconnectionbetweenthedatainthecomputerandtheinformationactuallyprocessed,andtoimprovetheefficiencyofinformationprocessing.

BasicPrinciples

Thebasicprincipleofinformationcodingistologicallymeettherequirementsofusersandbesuitableforprocessing;

ThestructureiseasytounderstandAndmaster;

Itmusthaveawiderangeofapplicabilityandbeeasytoexpand.

Codetypes

Therearegenerallytwotypesofcodesthatshouldbeavailable.Onetypeismeaningfulcode,thatis,thecodeisgivenacertainpracticalmeaningtofacilitateclassificationandprocessing;theothertypeismeaninglessThecodeisjustauniquecodeassignedtotheinformationelementtofacilitatetheoperationoftheinformation.Commonlyusedcodetypesare:

(1)Sequencecode,thatis,theorderofreceivinginformationelementsiscodedinsequence;

(2)Intervalcode,thatis,acodeintervalisusedtorepresentacertaininformationGroup;

(3)Memorycode,thatis,thecodethatcanhelpassociativememory.

Therearemanyformsofinformation,sotherearemanycodingschemes.Forexample:Graphiccharactercodes(GB5007-85)forChinesecharactersandcommonlyusedsymbols(GB5007-85)formulatedbymycountry,"BIG5"(BIG5)forothercharactersandsymbolssuchasJapaneseandKorean,and"ASCIIcodeforEnglishcharacters""(AmericanStandardCodeforInformationInterchange).

Systemdesign

1.Determinethesystemgoal:DeterminetheinformationcontentofthePDMsystemaccordingtotheoverallgoalofthesystem,conductacomprehensiveinvestigationofthedataandinformationrelatedtotheenterpriseandproducts;analyzevarioustypesThenatureandcharacteristicsofinformation;optimizationandreorganizationofinformationclassification;unifieddefinitionofinformationnamesandprovisionofsystemdesigndata.Therearemainlythefollowinginformation:materials,designdocuments(plans,calculations,etc.),processdocuments(processroutes,processcards,etc.),productdrawings,changeorders,etc.

2.Datainvestigationandanalysis:

Preliminaryinvestigation:Thepreliminaryinvestigationistoinvestigatethebasicsituationofthecompany,includingthecompany’sproductionplan,productiontype,productvariety,output,equipment,andtechnology,Productioncapacity,quality,cost,productstability,productdevelopmenttrend,inventory,salesandserviceconditions,etc.

Investigationofthestatusquo:Accordingtotheinformationscopedeterminedbythepreliminaryinvestigation,conductanin-depthinvestigationofthecurrentinformationclassification,codingsituationandproductstructuredataoftheenterprise,andcollectallnecessarydocuments,statements,accountdetails,Varioustypesofdocuments,etc.

Characteristicanalysis:Usethecharacteristictablemethodtoanalyzethecharacteristicsofthecollectedinformation,anddefineuniformlythethingsorconcepts,dataitemsanddataelementsthatrequireaunifiednameormultiplenames.

3.Determinethelist:Preliminarilysortoutthecollectedinformation,listthelistornametable,andusetextandnumericcodesfordescriptionasmuchaspossible.

4.Formulatecodingrules.Eachinformationshouldhaveanindependentcode.Theinformationcodeisgenerallyacompositecodecomposedofaclassificationcodeandanidentificationcode.Theclassificationcodeisacodethatindicatesthecategoryofinformation,andtheidentificationcodeisacodethatindicatesthecharacteristicsoftheinformation(suchasstructuralshape,material,process,etc.).

Thestructureoftheinformationclassificationcodingsystemgenerallyadoptsthedecimalclassificationsystem.Inthedecimalclassificationsystem,thelevelisexpressedintheformofatreestructure,andthepositionofeachcodepointisdeterminedbythepreviousdigit,andisrepresentedby0-9digits,andeachcodepointexpressesafixedmeaning.

Inordertoensurethecorrectinputofthecode,acheckcodeshouldbeaddedtothelongercodeandthosecriticalcodestochecktheerrorscausedbytheinput,transmissionandotheroperations.

Differenttypesofinformationcanhavedifferentencodingrules,andequallengthencodingisusedforthesametypeofinformation.

5.Establishacodingsystem:Chooseacodingsystemthathasbeenmatureinpracticalapplications,andtrytousevariousinformationcodes(materialcodes,productcodes,toolingcodes,etc.)thatexistintheenterpriseasmuchaspossible.Set,adjustandmodifytobecomethecompany’sinformationcodingsystem.

6.Verification:Afterthecodingsystemisformed,thecodingsystemshouldbetested,modifiedandsupplementedtoensurethereliabilityandapplicabilityofthecodingsystem.

7.Releaseandimplementation:allclassificationsystems,codingsystemsandvariouscodesshouldbeinaccordancewithcorporatestandards

8.Conclusion

ProductinformationcodingisdiscretemanufacturingThebasicworkfortheimplementationofinformatizationofanenterpriseistheprerequisitefortheimplementationofPDM,anditisalsoanecessaryconditionfortheimplementationofERP.Foragroupcompany,ifitssubsidiarybusinessisrelated,whetheritisasingle-siteormulti-sitecompany,itshouldbeunified.Encodingsystem.ThescientificdesignofacodingsystemisthekeytoensuringthesuccessofPDM/ERP.Whendesigningthecodingsystem,standardizationpersonnel,productdesigners,procurementpersonnel,productionmanagementpersonnel,etc.shouldbeinvolvedinthedesignofthecodingsystem,andeachindependentsubsidiaryshouldbefullyconsidered.Systemrequirements,andatthesametime,itisnecessarytoconsidertheintegrationofthecodingofeachsubsystemtoavoidcreatingnewsystemislands.

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