Tuesday 11 December 2007

Preferential attachment

Mias pou kanw epanalipsi twra diafores methodous montelopoiisis diktuwn, (as einai kala i viva) epesa pali sto montelo twn Albert-Barabasi, pou xrisimopoioun tin arxi tis preferential attachment gia na eksigisoun tis katanomes power law x^-k pou sunantwntai sti fusi. Auta ta kinezika sungentrwnontai apla se mia frasi pou oloi gnwrizoume oti antikatoprizei tin pragmatikotita: "the rich gets richer" kai eksigei giati to 80% tou ploutou brisketai sta xeria tou 20% tou pluthismou, i giati kanw sullogi apo upotrofies pou erxontai i mia meta tin alli. (Gia mia alli ermineia tou fainomenou sas parapempw sto "The Secret" mia hollywoodiani prospatheia na ginei ebraios gnwstos enas allos nomos, o Law of Atraction, gia ton opoio tha milisw mia alli fora).
Ekei pou thelw na kataliksw einai oti enw eixa apogoiteutei nomizontas oti eixa xasei to treno tou eunnoumenou 20%, diabasa sto Biblio "Linked" tou Barabasi, oti to preferential attachment exei kai merika parathurakia pou sou dinoun tin dunatotita na anadeixteis, akoma ki an den eisai Goliath. To paradeigma pou dothike itan auto tis Google, pou katafere kai anaduthike anamesa apo gigantes sto eidos tous opws i Inktomi, i mixani anazitisis pisw apo tin Yahoo. Xwris na eiselthw se leptomereies gia to pws to katafere i Google, (an to kanete Google tha breite sigoura) tha epimeinw se mia arxi: O nomos tou preferential attachment an kai statistika isxuros, den isxuei panta, kati pou sunithiza na pisteuw palaiotera. Auti i diapistwsi einai idiaitera xrisimi se obsessions tou tupou, "an ola pane straba, na perimenw na mou erthoun ki alla" Protimw na efarmozw ton nomo epilektika stis periptwseis pou ola pane kateuxin, kai tin eksairesi tou otan den blepw fws sto tounel.
Auta me tin proodo sto PhD, an kapsw perissotera egefalika kuttara prospathwntas na epituxw peraiterw paromoies filosofikes proektaseis basizomenos sti theoria diktuwn, tha eiste oi prwtoi pou tha to parete xampari.

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