1 Pertemuan 19 Searching Mechanisms Matakuliah: M0284/Teknologi & Infrastruktur E-Business Tahun: 2005 Versi: >

2 Learning Objectives Describe the role of search engines in e- business Explain how search engines work Describe use of search engines in intranet and extranet environment Identify important search engines in the market Describe a flexible search strategy

3 Overview Need for search engines History of search engines How do search engines work? Common search features Common display features Subject directories and specialized databases Meta-search engines

4 Overview (Cont’d) Evaluation of search engines Search engines listings Popular search engines A flexible Search Strategy

5 Need for Search Engines E-Commerce –Microsoft, Oracle web sites over 1 million pages Multi-media databases E-Governance –business, citizens: rules, regulations E-Employee –rules, regulations, human resources E-Business –product specifications, catalogs, contract details, availability

6 History of Search Engines Anonymous FTP sites Archie –for searching FTP sites Gopher servers –for text documents Veronica –for searching Gopher sites Spiders –to collect and search URLs, titles and web headings

7 How do Search Engines Work?

8 Gathering –visit web sites, bring document copies Indexing –collect key words, phrases and index against URLs –Spider server Searching –search index of words/ phrases –Index server

9 How do Search Engines Work?

10 Common Search Features Boolean Searching AND OR

11 Common Search Features Phrase Search “acid rain” Proximity Search America NEAR warming Wild card Search * ? Concept Search Natural Language Search Ask Jeeves

12 Common Display Features Relevance Ranking How to arrange the output of the search engine? –Frequency –Popularity of the site –Location of the words –Connectivity of the page and site