Dan’s Posterous

Dan’s Posterous

Dan Williams  //  Name: Dan Williams

Location: Guildford, Surrey, UK

Born and raised in Somerset, I am a Computing student at Plymouth University currently on a year's placement at Allianz in Guildford. I enjoy football, technology, film and really want to go travelling next summer!!

May 14 / 11:44am

Church of Searchology

Google has announced a list of new search technologies geared to help users 'slice and dice' their Google search results, along with a tool to help cull information instead of web pages.

http://www.techworld.com/applications/news/index.cfm?newsid=115792&email
Filed under  //  google  

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May 12 / 4:13pm

How Apple Made Windows 7 Better.....

Apple's Windows 7 Renovation Effort

By Rob Enderle
TechNewsWorld
05/11/09 4:00 AM PT

I just finished a deep dive on Windows 7. I installed the Release Candidate (RC) version on three machines, and I now have a good grasp of the product, the launch and the surrounding ecosystem. This is the best-prepared Microsoft has ever been since I started covering the company and, to a large extent, it owes a lot of its success to Apple.

The Mac vs. PC ads served as a better motivator than any Microsoft manager could have, keeping an incredibly complex company focused on the items Apple signified were the most damaging, until there weren't any left to focus on.

In addition, Microsoft has gone beyond Apple in areas like virus protection, in that it now is building its own free antivirus product, while Apple seems to be emulating the Microsoft of the '90s and ignoring the problem.

Until now, Apple has been blessed, because Windows has been more vulnerable and more prevalent. However, after Windows 7 launches and users get free AV, Windows will be more secure -- on paper, anyway -- and the virus writers will likely switch their focus to Apple. Given that Apple vulnerabilities are demonstrated every year at the Black Hat conference, this probably won't end well for Apple. Still, it played a major part in propelling Microsoft's aggressive move to improve Windows.

For some reason, this reminds me of the joke about the two guys running from the bear. One stops to put on running shoes and his soon-to-be-ex-buddy says, "What are you doing? You'll never outrun the bear." To which he responds, "I don't have to outrun the bear -- I just have to outrun you." The virus writers are the bear, and Microsoft is putting on the running shoes. In the end, Apple made Windows 7 better -- and I bet it will regret this a lot, come October.

Filed under  //  Apple   Windows 7  

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May 6 / 5:43am

Dijkstra's Algorithm

Dijkstra's Algorithm - Interesting stuff especially when compared with the Bellman-Ford algorithm

Filed under  //  networks   University  

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May 2 / 10:38am

My Countryside Pictures

I was walking my dog along the Bridgwater-Taunton canal and spotted some nice shots :)

           
Click here to download:
My_Countryside_Pictures.zip (4471 KB)

Filed under  //  photos  

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May 2 / 9:53am

Digital Imaging - Lossy Vs. Lossless

Understanding image compression is really just a matter of thinking in numbers. The number of bits that are stored and the number of pixels that make up the image are key factors. An uncompressed image with a resolution of 640 x 480 pixels has 307,200 pixels total. A true color (24 bit) image of that size would take about 1 MB of storage space considering each pixel uses 3 bytes. The file size increases with the image resolution, for instance, if we have a true color image resolution of 1024 x 768 pixels, it's going to take 2.5 MB of storage space. Now, imagine that you have a few 2.5 MB files on your server that are downloaded by everyone who visits your web site... you would probably use up a lot of bandwidth quickly!

Thankfully, we can compress image data to make the file smaller while retaining the size of the image. There are a lot of programs that can convert and compress your images with ease, in fact, most image editors can. Also, most digital cameras compress your images automatically so you can store more images and move them to your computer quicker. Smaller image files are easier to manage which is why compressed images are ubiquitous. Images can be compressed in two ways, lossless and lossy. The difference between the two is that lossless files retain their data while lossy files lose data.

Lossless files like TIFF, GIF and PNG are saved using algorithms that reduce file size but do so without losing image quality. Unfortunately, the compression ratios are quite a bit weaker than lossy. That means that it will ultimately be a larger file, but the quality will be well preserved. Usually, images that will be printed are saved with a lossless compression because the integrity of the image is more important than viewing it on the Internet, for example.

Lossy files like JPEG and JPEG2000 discard information when they are saved. The amount of information that is discarded directly influences the size of the file. It's important to note that once you save a lossy file, you can never go back to the previous state. Each time the file is opened and saved as a JPEG, it will lose more and more data which will cause the image to become pixelated. The reason for this is that pixel data is trashed during compression and when the image is reopened, the computer must fill in the missing data by borrowing from neighboring pixels. This also happens when an image has been saved using a very high compression ratio for the same reason.

Low compression = Higher quality image
High compression = Lower quality image

Filed under  //  University  

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May 1 / 2:31pm

Really useful subnetting tutorial

I found this subnetting tutorial really helpful so anyone learning computer networks may want to have a look

Filed under  //  networks   University  

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Apr 30 / 8:56am

Random Photos

Some quite random photos from my phone :)

     
Click here to download:
Random_Photos.zip (1894 KB)

Filed under  //  photos   random  

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Apr 30 / 7:56am

Three-Way Handshake: Surprisingly not a sexual position

Currently revising for a university exam on computer networks and thought I would share the TCP connection method that is the three-way handshake

Filed under  //  networks   University  

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Apr 26 / 8:04am

Uni work has made me crazy/cool


Filed under  //  funny   photos   random   University  

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Apr 21 / 3:25am

My Peugeot 106

These are the photos I have taken to put my old Peugeot 106 on eBay so thought I would add to my posterous page so I can look back on how much I enjoyed driving that little car.

         
Click here to download:
My_Peugeot_106.zip (6215 KB)

Filed under  //  car   ebay  

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