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Web Mining Essay

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1
Abstract.
In this paper, we present an overview of research issues in web mining. The World Wide Web has turned to be one of the largest information sources. It is an heterogeneous,explosive,,dynamic and mostly unstructured data repository.Some companies use the Web to find out more about heir competition.the user want to have the efficient search tools to find significant information easily. All of them are expecting tools or techniques to help them satisfy their demands and / or solve the problems encountered on the web. Therefore,web intelligence is required to help organizations in decision making as well as also help users in finding relevant information. Web mining with respect to web data referred here as web data mining. In particular, our focus is on web data mining research in context of our web warehousing project called WHOWEDA (Warehouse of Web Data). We have categorized web data mining into threes areas; web content mining, web structure mining and web usage mining. We have highlighted and discussed various research issues involved in each of these web data mining category. We believe that web data mining will be the topic of exploratory research in near future. 1 Introduction

The advent of the World Wide Web has caused a dramatic increase in the usage of the Internet. The World Wide Web is a broadcast medium where a wide range of information can be obtained at a low cost. Information on the WWW is important not only to individual users, but also to the business organizations especially when the critical decision-making is concerned. Most users obtain WWW information using a combination of search engines and browser, however, these two types of retrieval mechanisms do not necessarily address all of a user’s information needs. This is particularly true in the case of business organizations that currently lack suitable tools to systematically harness strategic information from the web and analyze these data to discover useful knowledge to support decision making. A recent study provides a comprehensive and comparative evaluation of the most popular search engines [1]. A more recent survey of web query processing has appeared in [23].

The resulting growth in on-line information combined with the almost unstructured web data necessitates the development of powerful yet computationally efficient web data mining tools. Web data mining can be defined as the discovery and analysis of useful information from the WWW data. Web involves three types of data; data on the WWW, the web log data regarding the users who browsed the web pages and the web structure data. Thus, the WWW data mining should focus on three issues; web 2

structure mining, web content mining [8] and web usage mining [2,10,13]. Web structure mining involves mining the web document’s structures and links. In [24], some insight is given on mining structural information on the web. Our initial study [5] has shown that web structure mining is very useful in generating information such visible web documents, luminous web documents and luminous paths; a path common to most of the results returned. In this paper, we have discussed some applications in web data mining and E-commerce where we can use these types of knowledge. Web content mining describes the automatic search of information resources available on-line. Web usage mining includes the data from server access logs, user registration or profiles, user sessions or transactions etc. A survey of some of the emerging tools and techniques for web usage mining is given in [2]. In our discussion here, we focus on the research issues in web data mining with respect to the web warehousing project called WHOWEDA (Warehouse of Web Data).

The key objective of WHOWEDA at the Centre for Advanced Information Systems in Nanyang Technological University, Singapore is to design and implement a web warehouse that materializes and manages useful information from the web to support strategic decision making. We are building a web warehouse [7] using the database approach of managing a web warehouse containing strategic information coupled from the web that may also inter-operate with conventional data warehouses. One of the important areas of our work involves the development of techniques for mining useful information from the web. We would be integrating WHOWEDA with intelligent tools for information retrieval and extend the data mining techniques to provide a higher level of data organization for unstructured data available on the web.

With respect to our web data mining approach, we argue that extracting information from a very small subset of all HTML web pages is also an instance of web data mining. In WHOWEDA, we focus on mining a subset of web pages stored in one or more web tables because we believe that due to the complexity and vastness of the web, mining information from a subset of web stored in the web tables is more feasible option. Our web warehousing approach allows us to do this effectively as we materialize only the results returned in response to a user's query graph. 2 WHOWEDA

In WHOWEDA, we introduced our web data model. It consists of a hierarchy of web objects. The fundamental objects are Nodes and Links, where nodes correspond to HTML text documents and links 3
correspond to hyper-links interconnecting the documents in the WWW. These objects consist of a set of attributes as follows: Nodes = [url, title, format, size, date, text] and link = [source-url, target-url, label, link-type]. In our web warehouse, Web Information Coupling System (WICS) [9] is a database system for managing and manipulating coupled information extracted from the Web. We have defined a set of coupling operators to manipulate the web tables and correlate additional useful and related information [9].

We materialize web data as web tuples stored in web tables. Web tuples, representing directed connecting graphs, are comprised of web objects (Nodes and Links). We associate with each web table a web schema that binds a set of web tuples in a web table. A web schema contains the meta-data that binds a set of web tuples to a web table in the form of connectivities and predicates defined on node and link variables. Connectivities represent structural properties of web tuples by describing possible paths between node variables. Predicates on the other hand specify the additional conditions that must be satisfied by each tuple to be included in the web table. In WICS, a user expresses a web query in the form of a query graph consisting of some nodes and links representing web documents and hyperlinks in those documents, respectively. Each of these nodes and links can have some keywords imposed on them to represent those web documents that contain the given keywords in the documents and/or hyperlinks. When the query graph is posted over the WWW, a set of web tuples each satisfying the query graph are harnessed from the WWW. Thus, the web schema of a table resembles the query graph used to derive the web tuples stored in web table. Note that the results are returned as web tuples. Note that some nodes and links in the query graph may not have keywords imposed. They are called unbound nodes and links, respectively.

Consider a query to find all data mining related publications by the computer science faculty at Stanford University, starting with the web page http://www.cs.stanford.edu/people/faculty.html. The query above may be expressed as follows :

AI or database e
publications
http://www.cs.stanford.edu/people/faculty.html data mining
x y z
4
The above query graph is assigned as schema to the web table generated in response the above query. The schema corresponding to the above query graph can be formally expressed as where Xn is the set node variables; x,y,z in the example above, Xl is the set of link variables; - (unbound link) and e in the example, C is set of connectivities ; k1 k2 where k1 = xy, k2 = yz and P is a set of predicates as follows : p1 p2 p3 p4 such that p1 (x) = [x.url EQUALS http://www.cs...

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