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.