This paper examines the denial of service attacks of February 2000 to determine the impact of an exogenous website shutdown on user behavior. The attacks had a lasting negative impact on six of the seven websites attacked (CNN, Yahoo, ZDNet, Amazon, Buy.com, and EBay, but not E*Trade). Using a new method to identify switching costs, the paper shows that, for Yahoo and the other free websites, t...

When we have a large amount of information, we usually use categories with a hierarchy, in which all information is assigned. The Yahoo! Internet directory is one such example. This paper proposes a new method of integrating two catalogs with hierarchical categories. The proposed method uses not only the contents of information but also the structures of both hierarchical categories. In order t...

User networks are beginning to be increasingly difficult to manage because of the large volume of information which is circulated within them. For example, in the Yahoo!Answers network, the large number of questions makes the identification of an expert, who would be the most suited to answer a question, a long-lasting process (currently this process is semi-automatic). This paper proposes an a...

It is an essential product requirement of Yahoo Mail to distinguish between personal and machine-generated emails. The old production classifier in was based on a simple logistic regression model. That model trained by aggregating features at the SMTP address level. We propose building deep learning models message train four individual CNN models: (1) content with subject as input, (2) sender e...

this survey is aimed to compare the hierarchical structure of subject directories, including yahoo, the open directory and looksmart with dewey decimal classification (ddc) in 10 selective subjects. five questions are raised to compare the broadness and the depth of the hierarchical structures in the subject directories and ddc and to study the effectiveness of the usage of ddc in the organizat...

In these days, many of us use question and answer (Q&A) sites where we share our problems and get solutions of them. For example, about 3.11 million questions were submitted to Yahoo! chiebukuro 1 from April/2004 to October/2005. Because of this large numbers of questions, questioners had better submit questions which give enough information to answerers. However, it is difficult to make good q...