- A goal without a plan is just a wish

 

 

Auditory feedback in a gesture interface is about indicates transitions between menu items. Usually transitional auditory feedback is a short and percussive clicking sound that triggers on the boundary or center of a menu item. This auditory feedback also shown to be helpful for separating items on a circular menu as well and how much auditory feedback can affect the usability of menu selection in hand gesture interfaces. 

Preemptive auditory feedback provides additional feedback just before the trigger sound at the boundary between menu items is imminent and informs users that the transition between menu items is imminent. While continuous auditory feedback is an alternative to generating auditory feedback at specific locations in the circular menu is to provide the user with constant auditory feedback. 

One of the main features of software keyboards is the flexibility of customization to support multiple languages, key layouts, and screen orientations. However, on-screen keyboards have several shortcomings, including no tactile feedback for enhancing touch-typing accuracy [2] and the small size of the keys. Small screen causes the input rate decrease and the error rate increases. 

            One solution towards this problem is space limitation of a software keyboard by proposing a new-entry method for small-sized touchscreen devices. This method uses deterministic key combinations for the constructions of letters which give result it requires no more than two keystrokes per latter and avoid the letter-recognition problems associated with Graffiti writing and free-writing. The design of the UOIT keyboard is inspired by the need for a less crowded text-entry method that allows for easier and more error-free tapping. Several constructive entry methods have been invented to assist with the entry of the valid Korean characters on a small screen. In the Korean language, one character or one syllabic block is constructed by placing two to five consonant and vowel letters horizontally and/or vertically within a small imaginary square. The number of consonants and vowels are 14 and 10, respectively, and the number of mathematically possible syllabic blocks is 11 172, more than can be accommodated by any size of screen.

            For English letters, we divided the 26 letters into two groups: eight require one stroke and 18 require two strokes. For the 18-letter group, we broke each letter into two drawing segments and extracted the common drawing components: five symbolic keys (||, − , ⋅, ⊃, |) and U, O, T, C, P, and V, where U, O, T, C, P, and V along with A and E are single-stroke letters. The 18 letters can be composed by combining the two drawing components in the correct order as illustrated in Fig. 2. Obviously, the number of strokes is increased in the UOIT keyboard, but the size of the keys is enlarged.

            The UOIT keyboard has 13 letter keys that can be used to express 31: 26 English letters and five common punctuation marks (i.e., period, question mark, comma, dash, and apostrophe). It uses only 41.9% (=100×13/(26+5)) of the keys from the standard QWERTY keyboard. Six functional keys are also included (i.e., space, shift, number flip key, enter, keyboard switch, and delete key), as shown in Fig. 1(b). The number flip key at the bottom left of the UOIT keyboard is used to flip to input numbers and special symbols as in the standard QWERTY keyboard, whereas the keyboard switch key is to switch to another keyboard layout. Because the number of keys in the UOIT keyboard is cut approximately in half, each key can occupy twice the width of a key in the QWERTY keyboard, as shown in Fig. 1. These large keys help a user to experience exact tapping of intended keys.