Skip to main content

Albert-László Barabási: V pavučině sítí

Raz som čítal na stránke osel.cz článok o nervových spojeniach, ľudskom správaní a sieťach. Celkom ma to zaujalo, pretože už nejaký čas predtým som začal rozmýšľať o prepojeniach (sieťach) nielen v ľudskom organizme ale aj inde, napríklad v ekonomike alebo vo vzťahoch v spoločnosti. V článku bol odkaz na túto knihu, tak som si ju poznačil a keď o niekoľko mesiacov prišli Vianoce, poprosil som Ježiška o darček.

Meno autora mi nič nehovorilo, ale už po prečítaní prvých strán som si ho obľúbil a nevyzerá na nejakého zapadnutého vedca, skôr naopak. Rovnako preklad určite nerobil niekto neznalý problematiky, v knihe je veľa dobrých poznámok prekladateľa. Celkom mi bolo sympatické aplikovanie fyzikálnych javov do zdanlivo nesúvisiacich odvetví.

Problematika sietí začína zhruba od roku nula, pri rozšírení kresťanstva - efektívne rozširovanie evanjelií do hlavných sídiel apoštolom Pavlom. Pokračuje klasickým príkladom 7. mostov v Kaliningrade, cez náhodné siete, rovnomerné a mocninové rozdelenie až po bezškálové siete. Zraniteľnosť sietí je zvýraznená pri napadnutí Yahoo! Mafia Boy-om alebo rozosielaním vírusu Love Bug. Pri každom modeli sa uvedú problémy a nedostatky v porovnaní s reálnymi sieťami a navrhne sa riešenie, ktoré sa overí. Vedecký prístup. Viacmenej sa celá kniha odvoláva na internetovú sieť a jej správanie. Táto sieť poskytuje celkom dobré prostredie na vytvorenie modelu, ktorý by istým spôsobom mohol byť aplikovaný aj do iných oblastí.

Po teórii šiestich krokov sa predstaví ešte fantastickejšia teória a to koľko krokov delí ľubovolného herca (vo filmovej databáze) od Kevina Bacona. Môj ujo mal od neho 4 kroky, taká Zdena Studenková 3. Ide o vyhľadanie najkratšej cesty vďaka dobre zmapovanému prepojeniu filmového priemyslu. Orákulum Kevina Bacona je na tejto stránke: oracleofbacon.org.

Na konci knihy je celkom obsiahla časť, kde sú poznámky autora takmer ku každej strane. Dobrá recenzia knihy je na www.knihovnice.cz.
Táto kniha mi dala odpovede na niektoré moje otázky, prinútila ma premýšľať a ukázala nové problémy a prístupy. Možno sa ju oplatí prečítať aj viackrát.

Comments

Popular posts from this blog

iMac G3: Mac OS X 10.4.11

So my goal to install Mac OS X Tiger has come true. Firstly I needed Tiger on CD's and that was a big problem because you can buy Tiger mostly on DVD although there are also some CD versions but very expensive. But I was lucky because friend of my friend, Neuromanc, lent me this very rare 4-CD version. So thanks again :-). My iMac is not officially supported because it has no FireWire. But you can override this with software XPostFacto . I downloaded and installed the latest version so I could use it with Mac OS X 10.3 (the previous versions worked only with OS 9). I erased HDD entirely before the installation just to be sure. After first restart the installation continued from other CD's. The installation process took approximately one hour and ran without problem. After registration the update process started-up and took another hour or more. It was repeated several times ma inly due to Java updates. Then finally I could download software and this time the latest versions. I ...

Our Wedding

“When you realize you want to spend the rest of your life with somebody, you want the rest of your life to start as soon as possible.”  When Harry Met Sally... (1989) In the midst of a global pandemic, when the future was so uncertain, we knew that it wouldn’t be a traditional wedding.  Our wedding planning all started months ago in our small Upper West Side studio apartment. We began planning our wedding together the day after we got engaged (but if you know anything about Mia, you would know that she had really been planning her wedding day since she was a little girl). Without all the answers and with a lot of moments of “wait..., what!?”, we began planning the day that would mark the beginning of our lives together. And like in the movie quote, we both agreed that we wanted that day to start as soon as possible, before the situation with COVID-19 in New York, and in the world, got worse. Truth be told, the process was anything other than what we expected wedding planning w...

Thanksgiving in Auburn, upstate NY

Mia and I had hoped to spend our Thanksgiving with our families and friends, but this is 2020. First we were thinking about traveling South (e.g. Virginia), but the driving would be just too long for us. Then we thought about going North and we both agreed that the Finger Lakes region beckoned to be discovered by us. For this trip, Mia suggested bringing our road bikes and I just could not say no. We found a very affordable Airbnb in Auburn, upstate NY. Driving there was not that long (~4.5 hours) but because we were not in a hurry, we came to town in the evening - Thanksgiving evening. We naively thought that we could get dinner in town, so after we checked in our Airbnb, we drove downtown. Surprise, surprise - everything was closed. Luckily, Mia packed frozen gluten-free pizza, avocados, apples and other food so our Thanksgiving was saved! Our apartment had a stove, oven and microwave oven and we could prepare meals for the evening and for our whole stay in Auburn. Next day we chose ...