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AUIC Tables of Contents: 00010203040506070809101112131415

Proceedings of AUIC'11, Australasian User Interface Conference

Fullname:Proceedings of the 12th Australasian Conference on User Interfaces -- Volume 117
Editors:Christof Lutteroth; Haifeng Shen
Location:Perth, Australia
Standard No:ISBN: 978-1-920682-97-2; hcibib: AUIC11
Links:Online Proceedings
A New CAPTCHA Interface Design for Mobile Devices BIBAHTML 3-8
  R. Lin; S.-Y. Huang; G. B. Bell; Y.-K. Lee
This paper discusses and demonstrates the interplay between system security and user interface convenience in CAPTCHA design, and in particular, mobile device CAPTCHA design. A CAPTCHA is a computer-based security test used to distinguish human users from artificial users, preventing automated abuse of networked resources. As mobile network services improve, we can anticipate that future mobile network services will come under attack from automated programs. Importantly, while CAPTCHA techniques have existed for Internet services for some time, only limited work has been carried out to establish CAPTCHAs suitable for mobile device interfaces. The Drawing CAPTCHA (2006) is one of the most well known systems of this type. Unfortunately, though it is straightforward, it is not secure. To demonstrate this, an image-processing technique is newly proposed that breaks the Drawing CAPTCHA. A new CAPTCHA approach is then introduced here which is intended specifically for mobile devices. Experimental results suggest that this new CAPTCHA design is user-friendly as well as secure.
Domain specific vs Generic Network Visualization: an Evaluation with Metabolic Networks BIBAHTML 9-18
  R. Bourqui; H. C. Purchase
Metabolic networks have been drawn manually for many years, and over time have developed representational conventions that make them familiar to biologists. With increasing current biological discoveries, these networks need to be frequently updated and modified, and automatic visualization algorithms are thus becoming a necessity. Many existing automatic graph layout algorithms exist, and it is not known whether such generic algorithms are sufficiently useful for biologists, or whether algorithms that specifically consider the existing representational conventions are necessary. No prior task efficiency evaluation studies have been performed on biological network visualizations. This paper reports on an experiment comparing the task efficiency of biologically relevant motif-search tasks using three layouts, two of which were produced using existing generic graph layout algorithms (Force Directed, Hierarchical), and one which was specifically designed to take existing metabolic representation conventions into account (MetaViz). Despite the search task favouring the easy identification of node connectivity in the Force Directed layout, the results showed no efficiency difference between Force Directed and MetaViz. We conclude that embodying the representational conventions in an automatic algorithm is not an impediment to task efficiency, and that some minor improvements to MetaViz would enhance its usefulness for biologists even further.
Investigating Objective Measures of Web Page Aesthetics and Usability BIBAHTML 19-28
  H. C. Purchase; J. Hamer; A. Jamieson; O. Ryan
As part of the ongoing debate about the role of aesthetic design of interfaces, this paper presents an aesthetic evaluation tool which quantifies the layout characteristics of a web page according to fourteen different metrics. By using the rich medium of web pages as our input, we have significantly extended the prior work done in this area which has typically focussed on simple interfaces. We report the results of an experiment to determine whether users' judgements of 'aesthetic appeal' and 'perceived usability' match the numeric metric results. We found that aesthetic appeal (but not perceived usability) was captured by a metric that considered the placement of all objects on the screen, and that the placement of images is a strong predictor of both aesthetic appeal and perceived usability. We suggest practical implications of this work for web page designers.
The Crowd in the Cloud: Moving Beyond Traditional Boundaries for Large Scale Experiences in the Cloud BIBAHTML 29-38
  A. Roughton; J. Downs; B. Plimmer; I. Warren
In this paper we propose a taxonomy for crowd based interaction paradigms, and categorise the literature according to this taxonomy. The conventional definition of crowds needs to be reconsidered in the light of advances in communication technology such as smart phones and cloud based infrastructures. We have extended the definition to encompass virtual dispersed crowds by considering the core components of crowd based activities. We found that much of the existing work offers simplistic reactive control in exchange for economical, highly synchronous, cooperative activities. We argue that the same cooperative component and economy can be obtained with rich reflective control. By combining the cloud, smart phones, and tools, this gap can be exploited to create a new class of rich, thought provoking, economical, crowd computing.
Visualising Environmental Corrosion in Outdoor Augmented Reality BIBAHTML 39-46
  J. A. Walsh; B. H. Thomas
This paper provides a description of outdoor visualisation of environmental corrosion data. This system was developed to aid in the visual understanding of data from wireless sensors used to monitor large structures. Due to the laborious manual inspections required for large structures (such as bridges), wireless environmental sensors have been designed to automate this process. Our system visualizes this information in its real-world context using the Tinmith mobile outdoor augmented reality system. We provide an overview of the visualizations, outlining a user study that was conducted to determine the effectiveness of the visualizations in providing the user with context-sensitive information, along with the preliminary results of this study. The paper concludes with an overview of future work on the system and final thoughts.
Progressive User Interfaces for Regressive Analysis: Making Tracks with Large, Low-Level Systems BIBAHTML 47-56
  J. Baldwin; P. Sinha; M. Salois; Y. Coady
Comprehension of low-level issues, such as malware threats, often relies on dated user interfaces that actually inhibit navigation and exploration of large code bases. These user interfaces often fail to exploit visualization techniques that could significantly alleviate cognitive overhead. An initial usability survey reveals that better and easier analysis of control flow is particularly critical for malware program comprehension. By developing tools that couple high-level views of control flow relationships with more detailed views of call sequences, we demonstrate how improved user interfaces can leverage visualization techniques. These tools go beyond the ubiquitous call graph and have the ability to scale in ways that promote their use for comprehending large, complex systems.
Feasibility Study of a Robotic Medication Assistant for the Elderly BIBAHTML 57-66
  P. Tiwari; J. Warren; K. Day; B. MacDonald; C. Jayawardena; I. H. Kuo; A. Igic; C. Datta
Management of complex medication regimens by older people poses a significant challenge wherein use of information technology could play a role in improving clinical efficacy and safety of treatment. The use of computing devices, however, presents a special challenge to older people given their physical and cognitive limitations. Robotic platforms show promise for extending the functionality of the user interface to make personalized interaction engaging and empowering, and for proactively reaching out to older users to support their healthcare delivery. We believe that a robot combining a touch screen and voice based interface could offer an effective platform to meet these requirements. This paper reports on a feasibility study of such a system for helping older people with their medications. We exposed 10 relatively independent residents of an aged care facility to our robot running a medication reminding application while they took their medications. The interaction was followed by a questionnaire and structured interview to elicit their opinions and feedback. We found the application to be well received as all users could successfully complete the session, and most subjects found it easy to use, appropriately designed and felt confident using it. A number of technical errors were uncovered, and the results suggest opportunities to refine the equipment and dialog design to provide a better robotic medication assistant.
Sketch-Based Crowd Modelling BIBAHTML 67-76
  L. Guan; B. C. Wuensche
The creation of complex virtual worlds has expanded from the domain of designers and animators to that of general users with no background in computer graphics. Example applications are military simulations, urban planning, landscape design, search and rescue simulations, and social media technologies such as "Second Life". In many cases the user wants to create content containing hundreds or thousands of similar objects. Modelling and placing each individual object is infeasible and new ways must be found to allow users to easily specify the distribution of a large number of objects.
   In this paper we introduce a sketch-based approach for crowd modelling, which is intuitive and suitable for different input devices such as mice, sketch pads, and touch screens (Windows 7). We derive design requirements by analysing real environments and by testing users' abilities to characterise crowds and collections/accumulations of objects. Based on these requirements we formulate a model-by-example approach in which users sketch a sample distribution of objects and our tool computes the complete "population" of objects over a domain specified with a sketched contour. In order to deal with different distribution patterns we first characterise the input and then use clustering and texture synthesis to replicate the characteristics over the domain. Initial results demonstrate that the tool gives plausible results for random, regular and clustered input and that it can be used in a wide variety of modelling applications.