The Key Techniques Of Deep Web Search Engine

There are great amounts of valuable information in the Deep Web, which can't be searched by general Search Engines. Research on Deep Web Search Engine and its key techniques will be useful to realize searching Deep Web automatically. Firstly, introduce the general principle of general Search Engine. Then give the summary of Deep Web. Discuss the definition and types of Deep Web, and analyze the survey of Deep Web quantificationally. After that, design the model of Deep Web Search Engine and give its definition, and point out its 4 key techniques as automatically DataBases Discovering, automatically DataBases Selecting, automatically Search Results Extracting, and Results Aggregation.Then discuss these 4 key techniques in detail. Present a new method for discovering database in the net based on Web Spider, and experiments show that this method is effective. Summarize different methods for DataBase Selecting, and based on these, design a new method to select databases automatically. Present a new method for automatically extracting Search Result Records, and experiments show that this method is simple and efficient. Analyze the question of Results Aggregation into 3 child questions, then discuss them, and give the summary of them.