tailieunhanh - A Semantic Web Primer - Chapter 1

The Semantic Web Vision World Wide Web đã thay đổi cách mọi người giao tiếp với nhau và cách thức kinh doanh được thực hiện. Nó nằm ở trung tâm của một cuộc cách mạng mà hiện tại đang thay đổi thế giới phát triển hướng tới một nền kinh tế tri thức và rộng rãi hơn, một xã hội tri thức. Sự phát triển này cũng đã thay đổi cách chúng ta nghĩ về máy tính. Ban đầu họ đã được sử dụng cho máy tính tính toán số. Hiện nay sử dụng chủ yếu của họ là dành. | TLFeBOOK 1 The Semantic Web Vision Today s Web The World Wide Web has changed the way people communicate with each other and the way business is conducted. It lies at the heart of a revolution that is currently transforming the developed world toward a knowledge economy and more broadly speaking to a knowledge society. This development has also changed the way we think of computers. Originally they were used for computing numerical calculations. Currently their predominant use is for information processing typical applications being data bases text processing and games. At present there is a transition of focus towards the view of computers as entry points to the information highways. Most of today s Web content is suitable for human consumption. Even Web content that is generated automatically from databases is usually presented without the original structural information found in databases. Typical uses of the Web today involve people s seeking and making use of information searching for and getting in touch with other people reviewing catalogs of online stores and ordering products by filling out forms and viewing adult material. These activities are not particularly well supported by software tools. Apart from the existence of links that establish connections between documents the main valuable indeed indispensable tools are search engines. Keyword-based search engines such as AltaVista Yahoo and Google are the main tools for using today s Web. It is clear that the Web would not have been the huge success it was were it not for search engines. However there are serious problems associated with their use TLFeBOOK TLFeBOOK 2 1 The Semantic Web Vision High recall low precision. Even if the main relevant pages are retrieved they are of little use if another 28 758 mildly relevant or irrelevant documents were also retrieved. Too much can easily become as bad as too little. Low or no recall. Often it happens that we don t get any answer for our request or that .