Collaborative filtering on the Web has existed for a long time, dating all
the way back to the original incarnations of sites like CDNow and Amazon.com.
Recommendation systems are a powerful tool for businesses to extract
additional value from their e-commerce and customer databases. They benefit
customers by enabling them to find products they like, and help businesses by
generating more sales.
We're going to look at some of the basic principles of predictive systems and
introduce some methods you can utilize to make recommendations in your own
applications. Along the way, we'll attempt to point out the benefits and
limitations of each type of system.
At the most basic level, predictive information can be provided manually for
your items. This can be built into the back-end administration of the site.
When adding products to an e-commerce site, yo... (more)
A denial-of-service (DoS) attack is an attempt by a single person or a group
of people to disrupt an online service. It is designed to bring the server
and network to its knees by flooding it with useless traffic. A DoS attack is
the most common type of Internet attack and can be launched against your site
at any time with relative ease. This can affect you by eating up your
bandwidth and server resources to service these bogus requests while leaving
no resources to fill legitimate requests.
So how do you know if you're being attacked? There are many variations of DoS
attacks, a... (more)
The availability of the Google Maps API has opened up a slew of new
development possibilities and spawned a bunch of web sites that rely on this
data to function. Example applications include jogging trackers, subway map
overlays, and other cool ideas all made possibly by the public availability
of the mapping API.
Geolocating by IP Address
Geolocation refers to the ability to locate a user's geographic latitude and
longitude from his IP address. There are several ways of doing this each with
its own benefits and drawbacks.
The most cost-effective source of this data is one of th... (more)
Keeping up with the latest Web technologies is tough nowadays. Every week it
seems new sites are launched that push the envelope further and further in
terms of what can be accomplished using just a Web browser.
The rise of AJAX over the past several months has taken over the development
world and breathed new life into the Web. Although these techniques have been
possible for many years now, the maturity of Web standards like XHTML and CSS
now make it a viable alternative that will be viewable by all but the oldest
It's also been possible to accomplish many of the same... (more)
Back in the November 2005 issue of CFDJ, we looked at how to create a live
map of your Web site visitors using Google Maps and other freely available
Now that Yahoo! and Microsoft have joined the fray and released their own
mapping APIs, we'll revisit our example while learning about each
implementation along the way. All of these APIs are extremely powerful, but
each has its own advantages that may work better for your particular
solution. We'll take a look at each in detail and outline some of the
benefits and drawbacks of each.
Geo-locating by IP Address
Let's go o... (more)