Als gebruiker van catalogi en online databases gaat men er meestal vanuit dat gevonden zoekresultaten betrouwbaar zijn. Pas als verschillen in zoekresultaten optreden tussen een Federated searchsysteem zoals PurpleSearch, en een individuele database, wordt men wantrouwig. Wat kan hier aan de hand zijn?
Dat verschil in resultaten kan op twee manieren: ofwel een Federated searchsysteem vindt minder, ofwel het vindt meer dan een native interface, een zoekmachine van een individueel bestand.
In het kort enige uitleg over de werking van een zoeksysteem: Elk zoeksysteem heeft een bak met data waarop de zoektermen van de gebruiker losgelaten worden. Om de juiste gegevens boven water te halen zijn programmeertaal, scripting en allerlei trucs nodig.
Meestal zal een native interface een beter resultaat leveren dan een Federated searchsysteem, maar soms zal zo’n Federated searchsysteem juist een beter resultaat halen.
Een beter resultaat betekent overigens niet altijd meer treffers. Als iemand één set treffers (zoek op woord A) verkleint (is koppelen met Booleaanse operator AND) met een andere set (woord B), wordt er logischerwijze een set (C = woorden A+B) met minder treffers gevonden: een verzameling treffers die zoekwoorden A èn B beide heeft.
Als een ander zoeksysteem in plaats zegt met A en B te zoeken, maar in werkelijkheid zoekt met A Of B, (de set A en B wordt gekoppeld met Booleaanse operator OR), in dat geval zal de set groter worden. Het zoekresultaat is dan weliswaar groter, maar het resultaat is van minder kwaliteit.
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- Last day of my apprenticeship in the University Library 30 januari 2009oday my last day of my apprenticeship in the University Library. On this blog you have been reading about the things I’ve done this last three months. Next monday my colleagues of the Library Faculty of Arts expect my back in the Harmonie building. It has been a quite interesting period. Completely something else than in the Faculty [...]
- Last day of my apprenticeship in the University Library 30 januari 2009
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Michiel Thomas, colleague, photographer, painter, librarian!
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- My wife, June, who has always helped me on books like this, is not my best friend, but she is my severest critic.My wife, June, who has always helped me on books like this, is not my best friend, but she is my severest critic. Further bizarre memoirs, zany anecdotes, and satirical skewerings by the brilliantly caustic, outrageously ribald, and peerlessly neurotic pianist, raconteur, film actor and “jongleur of our times.” Show title The Unimportance of Bein […]
- He sat, in defiance of municipal orders, astride the gun, Zam-Zammah on her brick platform opposite the old Ajaib- …He sat, in defiance of municipal orders, astride the gun, Zam-Zammah on her brick platform opposite the old Ajaib-Gher - the Wonder House, as the natives call the Lahore Museum. A white youth in India, becomes friends with an old ascetic priest, the lama. The boy juggles Imperialist life with his spiritual bond to the lama, [...]
- From beginning to end, we root for greatness.From beginning to end, we root for greatness. Dodgers fans have experienced many good times, including multiple postseason appearances and six championships. But being a Dodgers fan is about more than following a winning team. This book will help fans of the Dodgers get the most out of being a fan. It takes 125 years of [...]
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- It was said that a new person had appeared on the sea-front: a lady with a little dog.
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