New Zealand Journal of Agricultural Research abstracts

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A hierarchical model of a FTP search engine with applications

Liang Hu^1,*

Xiaoshuan Zhang²

Ming Zhao²

Lili Guo¹

Weiwei Gong³

Zetian Fu¹

¹College of Engineering
China Agricultural University
Beijing 100083, PR China

²College of Information and Electrical Engineering
China Agricultural University
Beijing 100083, PR China

³College of Economics and Management
China Agricultural University
Beijing 100083, PR China

*Corresponding author: holypku@163.com, caunews2@cau.edu.cn

Abstract    Because the traditional FTP search engines usually adopt centralised spiders to collect data, insufficient temporal effectiveness is their major demerit. For solving this problem, this paper presents an efficient hierarchical FTP search engine model that deploys the spider agent on the node host of some specific network for collecting file data of FTP servers. The key technologies involve a regional responsibility mechanism, a search mechanism based on the asynchronous retrieval technology and a PAT Tree storage mechanism. The simulation shows that the responding time is less than that of the traditional system and the temporal effectiveness arrives at the application level. In addition, the test results show that the architecture has a good scalability.

Keywords    FTP search engine; hierarchical model; information retrieval; temporal effectiveness

A07073; Online publication date 17 December 2007; Received and accepted 10 August 2007

New Zealand Journal of Agricultural Research, 2007, Vol. 50: 641–646
0028–8233/07/5005–0641 © The Royal Society of New Zealand 2007

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