Article history: Received 9 August 2008 Received in revised form 30 November 2008 Accepted 19 December 2008

for his invaluable guidance, support, time, and understanding (and tolerance) this past year. Lastly, I thank my parents for their perseverance in dealing with me for the last 24 years. It really is quite a feat.

CAPTCHAs are known as Captcha which stands for Completely Automated Public Turing test to tell Computer and Human Apart. used prevent automated scripts from harvesting email addresses publicly accessible forms on the internet submitting them spammers. mostly utilised because computers have a difficult time deciphering text concealed behind distorted visuals, but humans an easier information hid...

Amphiphilic polymers have recently garnered much attention due to their potential use in drug-delivery and other biomedical applications. A modular synthesis of these polymers is extremely desirable since it offers precise individual block characterization and increased yields. We present here for the first time a modular synthesis of poly(oxazoline)-poly(siloxane)-poly(oxazoline) block copolym...

Computer methods for evaluating student’s knowledge have traditionally been based on Multiple Choice Questions (MCQs) or fillin-the-blank exercises, which do not provide a reliable basis upon which to assess student’s underlying misconceptions. Because of this lack, we have devised and implemented a procedure for automatically deriving clickable students’ conceptual models from their free-text ...