- Google Custom Search Google Custom Search allows you to create your own search engine. Let's say that you are researching a topic such as nuclear non-proliferation. You know that there are a few sites that have a lot of information on this topic and you want to have a search engine that just focuses on it. We created a custom search engine called Nuclear Non-Proliferation. This engine indexes three sites: the Federation of American Scientists (http://www.fas.org), the United Nations (http://www.un.org), and the International Atomic Energy Agency (http://www.iaea.org). Note that you can add a link to this search engine to your blog or web page.
- Rollyo (Roll Your Own) Rollyo is similar to Google Custom Search. You can try searching other search engines, called "Searchrolls" or you can create your own after registering for the service.
Search Options in Google: In order to use Google's search options, you must be signed in to your Google account. If you do a regular search when you're signed in, you'll notice a link before the search results called +Show options. If you click on this link, several options will appear on the left side of the window, including ways to narrow your results by date, format, and view. You can also comment on Web sites that you find interesting, and you can move results up on your list if they are useful to you. The comments that you make can be personal (only available to you when you're signed in) or you can make them public so that others can read them.
Semantic Web Search Engines: Semantic search is a way of retrieving search results based on semantics. Semantics is the science of language and the connection or meaning of words. Computers can search for and present information but don't really understand the meaning of the words that make up the documents. The semantic Web is about having data attached to documents that enable computers to understand the information better so that searchers can obtain more relevant results. The semantic Web has not been realized yet, but many researchers, including Tim Berners-Lee (the inventor of the World Wide Web) are working on it. Some say that the semantic Web will be Web 3.0. Semantic search uses a semantic network to map meanings and relationships of words. Some examples are:
- GoPubMed -- This is actually a semantic interface for PubMed, the National Institutes of Health medical database
- Hakia
- Powerset -- Uses information solely from Wikipedia
- True Knowledge - Requires free registration
- Yebol
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