Ying-Lien Lee

An integrated framework for continuous improvement on user satisfaction of information systems

Purpose – The primary purpose of this paper is to present an integrated framework for user interface prototyping and evaluation for the development of information systems and to present architecture for evaluating generic applications.Design/methodology/approach – The framework is constructed through combining two distinctive methods of prototyping and evaluation, statechart and goals, operators, methods, and selection rules. Relevant methods and architectures of the integrated framework are presented in unified modeling language when possible.Findings – The importance of the usability of information systems is highlighted in this research. However, it still lacks an integrated framework for information system development and usability evaluation. This paper provides a framework that evaluation method is intertwined with user interface prototyping to shorten the time of development lifecycle. The architecture for evaluating generic applications is also invaluable for motion and time study and the procurem...

Usability study of text-based CAPTCHAs

Abstract Completely Automatic Public Turing test to tell Computers and Humans Apart, or CAPTCHA, is a security measure that guards a system from exploitation by the discrimination between a real human being and an automated computer program via the method of presenting to the unknown user the challenges that are hard for computer yet easy for human. Focusing on text-based CAPTCHA, this study conducted an experiment to study the effect of age groups and distortion types on the CAPTCHA task. Twenty-four participants were recruited to take part in the experiment, where twelve of them were in the elder group (aged 50–56) and twelve in the young group (aged 23–24). One type with no distortion and five types of common CAPTCHA distortion techniques were considered. The results of non-parametric analysis of the data revealed that the participants of two age groups differed significantly in terms of response time, error rate, and NASA-TLX score. Distortion type had significant effect on response time, error rate, Critical flicker fusion (CFF), and NASA-TLX score. Post-hoc analysis showed that Blot Mask and Line Mask were the hardest CAPTCHAs, while Thread Noise, Global Warp, and Geometry Noise were on a par with Normal Type (no distortion). Dependent variables were also correlated to each other. With the inevitability of the security measure and the increasing population of elder internet users, this study has important implications for the design of CAPTCHA systems.

Reducing cognitive workload of a computer-based procedure system

The use of procedure systems is an important safety management strategy in coping with emergency or abnormal situations in a process control system. With the digitalization trend in these complex and large-scale systems, most aspects of a process control system are also computerized. In addition to the primary tasks, operators now have to do extra secondary tasks when using the computerized systems. In this research, three design features aimed to reduce the cognitive workload are evaluated on our research platform, SimCBP and SimPlant. These two systems work in tandem to simulate a Computer-Based Procedure (CBP) system and a simplified nuclear power plant. From the results of the experiments, the design of embedded controls/parameters is found to be efficient but its counterpart has implications for the design of training materials. Navigation aid, although not statistically significant, is important because of the subjective responses and the need of cross-referencing. The simplified flowchart display format, like other researches on the use of this format, revealed mixed results. Implications and directions for future studies are also proposed.

Effects of age groups and distortion types on text-based CAPTCHA tasks

Completely Automatic Public Turning test to tell Computers and Humans Apart, or CAPTCHA, is a security measure that guards a system from exploitation by the discrimination between a real human being and an automated computer program via the method of presenting to the unknown user the challenges that are hard for computer yet easy for human. Focusing on text-based CAPTCHA, this study conducted an experiment to study the effect of age groups and distortion types on the CAPTCHA task. Twenty-four participants were recruited to take part in the experiment, where twelve of them were in the senior group and twelve in the young group. Participants were observed to use three general steps: recognition, rehearsal, and motor response. With the inevitability of the security measure and the increasing population of senior netizens, this study has important implications for the design of CAPTCHA systems.

Green Advocate in E-Commerce

The continuous growth of e-commerce sees waves of information explosion. Online shoppers have to confront with more information than ever when they are making purchasing decisions. Among the tools that try to reduce this burden of information overload, recommender system is one of the widely employed techniques which can be seen in stores such as Amazon.com and iTunes Store. This paper presents an approach of the interaction design of recommender system in the context of green digital products. By cultivating the field of game design, elements that make game fun and engaging are borrowed and applied to the design of the recommender system to motivate shoppers to opt for greener choices. In addition, the idea of Kansei Engineering will be employed in the system to recommend according to the perceived characteristics of products. A framework of such system will be described, along with future extensions of the framework in the realm of e-commerce.

A study of trackball manipulation in ship simulator

ABSTRACT Numerous studies have found that the performance of manipulating a joystick on input tasks was affected by vehicle motion, and the movement speed of mouse was affected by different movement angles on static environment. However, very few studies have investigated the effects of motion direction of platform and the movement angle of cursor on the performance of using different trackballs. This study investigated the effects of different platform motion directions (static, heave, roll, pitch and random) and cursor movement angles (0°o, 45°o, 90°o, 135°o, 180°o, 225°o, 270°o and 315°o) on manipulating three different kinds of trackballs to conduct the point-and-click task. The results indicated that the input device, motion direction and movement angle have significant effects on movement time, and the interaction of input device* motion direction and motion direction* movement angle were also significant. The effects of input device and motion direction on accuracy were significant. The subjective evaluation also indicated that the motion direction on the difficulty of manipulating trackballs and the effects of trackballs were significant. The objective and subjective evaluations all indicated that manipulating trackballs in random motion was the most difficult, and in roll or pitch motions was also more difficult than that in static or heave. Our findings could help designers develop more efficient and comfortable interfaces, and consoles which are less sensitive to ship motions.