1 / 7

A core Course on Modeling

A core Course on Modeling. Introduction to Modeling 0LAB0 0LBB0 0LCB0 0LDB0 c.w.a.m.v.overveld@tue.nl v.a.j.borghuis@tue.nl P.1. Denoting concepts , properties and values. Remember : concept : a bundle of properties property: (name, set of values ) name: to distinguish properties

nico
Download Presentation

A core Course on Modeling

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. A core Course on Modeling Introductionto Modeling 0LAB0 0LBB0 0LCB0 0LDB0 c.w.a.m.v.overveld@tue.nl v.a.j.borghuis@tue.nl P.1

  2. Denotingconcepts, propertiesandvalues Remember: concept: a bundle of properties property: (name, set of values) name: todistinguishproperties type: set of allpossiblevaluesforthis property value : to single out a unique concept. A valuecanbeatomic or compound atomic: cannotbedecomposed compound: a concept, tobecomposedintofurtherproperties

  3. Denotingconcepts, propertiesandvalues ‘name’ refersto ‘something’. Whatvaluedoes ‘name’ have? or whatvalues do itsproperties have? • Notation: • name = something • name : something ‘name’ is a member of ‘something’. whattype of concept is it? Notice: p:{3,4} is the same as ‘p=3 or p=4’; p:{3} is the same as ‘p=3’

  4. Denotingconcepts, propertiesandvalues a type is a set of values. Ifthe set containsonlyonevalue we willoftendrop the accolades Notation: concept calledmyLantern properties: height, power height:{5 … 25}m power: {100,2000}W abbreviation: myLantern= [height: 12m, power: 2000W] allLanterns= [height: {5 … 25}m, power: {100,2000}W] tallLanterns= [height: {15 … 25}m, power: {2000} W] oneTallLantern: tallLanterns myLantern: allLanterns, myLantern: tallLanterns use set-notationtoindicate ranges (using ‘...’) or othercollections of values (using ‘ , ’) allLanterns and tallLanterns are sets oneTallLanternis a member of the settallLanterns, hence the ‘:‘ in stead of ‘=‘

  5. Denotingconcepts, propertiesandvalues strings that are not concept namesare in quotes Notation: • radius1=14.6 (in some unit; see later) • radius2:real, radius3: {3 … 12} • bandMembers={'Paul','John','George','Ringo'} • bandMember:{'Paul','John','George','Ringo'} • bandMember:bandMembers • monarchs=['Willem1','Willem2','Willem3','Emma','Wilhelmina','Juliana','Beatrix','Alex'] • Bea=monarchs[6] • Bea=='Beatrix' value set of values set, no order set used as type the same type, nowreferredtoby a name element of a vector, obtainedby means of an index a vector: a set indexedbynumbers quantity Bea is atomic (=does not consist of properties); a string with value 'Beatrix'

  6. dot-notation: supportedbyall computer languages ‘dot’ abbreviation of ‘its’ (=part-of). Iftype of P is compound: C.P.X. etc. Denotingconcepts, propertiesandvalues index notation: supportedby most computer languagesreminiscentof arrays (vectors): property name instead of integer index. Iftype of P is compound: C[P][X] etc. subscriptnotation: not supportedby computer languages. Developedfrom hand writing(compact: littletowrite). IfP is compound: subsubsubscriptetc. Not standardized (CP, PC, PC) Notation: • let concept C have property P with valuevP • Dot notation: C.P = vP • Index notation: C[P] = vP • Subscriptnotation:CP= vP • bandMembers={'Paul','John','George','Ringo'} • bandMember:{'Paul','John','George','Ringo'} • bandMember : bandMembers • bandMembers:[bas:'Paul',drums:'Ringo',guit:g] • g=['John','George'] • bandMembers[bas]=bandMembers.bas='Paul' • bandMembers[guit]=['John','George'] • bandMembers[guit][0]= bandMembers.guit[0]='John' vector: set, indexedbynames ordered set, indexedbynumbers indexedatomic element of a set indexing a compound concept toobtainanatomic concept compound concept

  7. Denotingconcepts, propertiesandvalues Clean conceptualizationmatters, because: • Confusionaboutnaming is a maincausefordisaster; • Organizationhelpsagainst chaos in case of complex models (1000-s of conceptsand relations) ; • Serves as a checklist: what relations toincorporate in the model? • Notationhelps making subtlechoices explicit and invites tothinkaccurately even prior the formalisationphase; • Computers start playinganessentialrole even in conceptual modeling, and computers requireunambiguousnotation (Web 2.0 !); • Whengoingto the next step, computers come in anyhow: sogoodnaminghelpsconsistencybetweenconceptual model andformalmodel.

More Related