When Eye-Tracking Meets Cognitive Modeling: Applications to Cyber Security Systems

Human cognitive modeling techniques and related software tools have been widely used by researchers and practitioners to evaluate the effectiveness of user interface (UI) designs and related human performance. However, they are rarely used in the cyber security field despite the fact that human factors have been recognized as a key element for cyber security systems. For a cyber security system involving a relatively complicated UI, it could be difficult to build a cognitive model that accurately captures the different cognitive tasks involved in all user interactions. Using a moderately complicated user authentication system as an example system and CogTool as a typical cognitive modeling tool, this paper aims to provide insights into the use of eye-tracking data for facilitating human cognitive modeling of cognitive tasks more effectively and accurately. We used visual scan paths extracted from an eye-tracking user study to facilitate the design of cognitive modeling tasks. This allowed us to reproduce some insecure human behavioral patterns observed in some previous lab-based user studies on the same system, and more importantly, we also found some unexpected new results about human behavior. The comparison between human cognitive models with and without eye-tracking data suggests that eye-tracking data can provide useful information to facilitate the process of human cognitive modeling as well as to achieve a better understanding of security-related human behaviors. In addition, our results demonstrated that cyber security research can benefit from a combination of eye-tracking and cognitive modeling to study human behavior related security problems

Biopolymers as potential carrier for effervescent reaction based drug delivery system in gastrointestinal condition

Biopolymers are naturally occurring materials formed in nature during the life cycles of organisms. Biopolymers include the polysaccharides, carbohydrates and protein such as cellulose, starch, wool, silk, gelatine and collagen. In recent years, biopolymer-based hydrogels become important area of research in pharmaceutical aspects because of their promising properties in drug delivery system. These properties include low toxicity, biodegradability, stability and renewable nature. Numerous studies have been carried out in order to develop carrier from biopolymers with better controlled release properties. This is important to ensure precisely desired concentration of drug or essential nutrient absorption into the blood or tissue could be achieved. Among other different approaches, floating system is one of the most convenient, economical, and effective drug delivery system. Floating delivery system could potentially achieve longer retention time of carrier with capsulated bioactive drug or functional nutrients in the gastrointestinal tract. The floating behaviour of carrier could be induced by effervescent reactions. Effervescent reaction occurs between acidic gastric content and pore forming agent such as carbonates or bicarbonates salts incorporated into the carrier. This chapter discusses some of the use of biopolymers in drug delivery systems for effervescent reaction in gastrointestinal tract