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Computer security depends largely on passwords to authenticate human users. However, users have difficulty remembering passwords over time if they choose a secure password, i.e. a password that is long and random. Therefore, they tend to choose short and insecure passwords. Graphical passwords, which consist of clicking on images rather than typing(More)
When users input their passwords in a public place, they may be at risk of attackers stealing their password. An attacker can capture a password by direct observation or by recording the individual's authentication session. This is referred to as shoulder-surfing and is a known risk, of special concern when authenticating in public places. Until recently,(More)
Graphical passwords are an alternative to alphanumeric passwords in which users click on images to authenticate themselves rather than type alphanumeric strings. We have developed one such system, called PassPoints, and evaluated it with human users. The results of the evaluation were promising with respect to rmemorability of the graphical password. In(More)
Access to computer systems is most often based on the use of alphanumeric passwords. However, users have difficulty remembering a password that is long and random-appearing. Instead, they create short, simple, and insecure passwords. Graphical passwords have been designed to try to make passwords more memorable and easier for people to use and, therefore,(More)
This study explores how student learning via asynchronous, threaded discussion boards may be managed successful. We examine the elements of course scaffolding on that affect student learning and engagement in discussion. We explore the role of the instructor in mediating learning. We base our findings on an analysis of 21 online courses in the IS domain,(More)
  • Jim Waters
  • Proceedings of the 41st Annual Hawaii…
  • 2008
This paper investigates the relationship between student role-behavior and position in a Social Network and the processes of creating sustained collaborative knowledge building in online learning communities. Through an empirical study of an online learning community, we analyze how core student participants (thought-leaders) interact with peers and how(More)
Discussion board systems are often used in teaching-learning settings to support discourse between students and instructors. However most existing discussion board systems are generic and built to be used in a variety of domains. They do not cater for the specific needs of teaching-learning settings. One significant shortcoming is that they do not recognize(More)
This paper presents a model for metacognitive learning evaluation in a community of inquiry and discusses how it may be used to incentivize effective learning in online graduate courses. We identify patterns of behavior and peer-learner interactions that indicate social engagement in community model building, based on an extensive, qualitative analysis of(More)
This project demonstrates the usefulness of a proposed plug and play communications standard (CANopen) for the medical device industry. A use case involving a hospital bed and an invasive blood pressure monitor (IBPM) was used for demonstration. Currently, IBPMs only measure a patient's blood pressure accurately if the patient's heart is at the same height(More)