Joe Danziger

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Top Stories by Joe Danziger

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. Basic Predictions 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)

Visualize Your Visitors with Google Maps

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)

Rock Solid Storage via Web Services

Storage and bandwidth - these have traditionally been the two hardest things to scale up as an application grows. Many a dot-com million has been spent building out rock solid storage infrastructures, sometimes for applications which never saw the light of day. Fast forward to 2006. These are good times for developers, with open source technologies, open APIs, and low-cost, commoditized services to help the little guys play along with the big boys. If you've struggled with adding storage to your application, Amazon's new Simple Storage Service may be just what you're looking for. ... (more)

Building a Drag-and-Drop Shopping Cart with AJAX

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 browsers. It's also been possible to accomplish many of the same... (more)

Defeating DoS Attacks

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)