The Icon programming language [1] is fairly stable now, although refinements and new features are added occasionally [2]. The implementation of Icon, on the other hand, is still changing constantly. Besides changes made to support new features of the language, changes are made to correct errors, improve performance, increase portability, accommodate the requirements of new compilers and operati...

Seeking exactness for \convex relaxation", we deene a map f : < n ! < m to be ICON if its image f(< n) is convex. Analogously, f is termed LICON(AICON) if the image of every linear (every aane) vsubspace under f is convex. In this paper, we investigate quadratic maps of these three types. These maps are motivated by a fact shown here that they prescribe conditions under which feasibility and op...

Mobile devices offer much potential to support older adults (age 65þ). However, older adults have been relatively slow to adopt mobile devices. Although much ongoing HCI research has examined usability problems to address this issue, little work has looked at whether existing graphical icons are harder to use for this population compared with younger adults. We conducted a qualitative explorato...

Two key features in the Icon programming language are tables and sets. An Icon program may use one large set or table, or thousands of small ones. To improve space and time performance for these diverse uses, their hashed data structures were reimplemented to dynamically resize during execution, reducing the minimum space requirement and achieving constant-time access to any element for virtual...

As computer use becomes more visual in nature, researchers and designers of computer systems would like to gain some insight into the visual search strategies of computer users and the characteristics of displays that encourage the most efficient of these strategies. Icons, which are becoming increasingly prevalent, serve as the focus for a set of studies on the interaction of human vision with...

This paper investigates the usability of five commonly used icons in digital cameras like landscape, video, night portrait and automatic mode. In the first phase a set of 10 open type questionnaires were applied on 110 students (75 male and 35 female) to get an insight into the type of problems with the icons. The second phase comprised of 5 ranking questionnaire. The third phase comprised of i...