Optimizing a Personalized Multigram Cellphone Keypad

Optimizing a Personalized Cellphone Keypad

Current layouts for alphabetic input on mobile phone keypads are inefficient. We propose a genetic algorithm (GA) to find a suitable keypad layout for each user, based on their personal text history. It incorporates codes for frequent multigrams. We optimize for two-thumb use, minimizing the number of strokes, and consecutive use of the same key or the same hand. Using these criteria, the algor...

Testing Predictive Text Entry Methods with Constrained Keypad Designs

The problem of optimizing keypad designs for predictive text entry methods for handheld devices has received significant interest in recent years. The necessity of such optimization lies in the ever-increasing difficulty of inputting text into mobile devices, particularly those of extremely small size. Predictive keypad text entry methods, such as Tegic’s T9, only require one key press for each...

AllAboard: A System for Exploring Urban Mobility and Optimizing Public Transport Using Cellphone Data

STEGANOPIN: A PIN ENTRY METHOD with SHOULDER SURFING RESISTANCE

Automated Teller Machine (ATM) frauds are escalating gradually. The principal cause for this is the repetition of same personalized identification numbers (PINs) for multiple systems or accounts. Indirect PIN entry methods though available are not yet deployed everywhere and are not user friendly. To increase security and applicability we have implemented a new PIN entry method called SteganoPI...

Maximizing interaction with mobile devices: quarts into pint pots

If a device is to be portable it must be small. However, the smaller a device is, the less physical room there is on it. This in turn limits the amount of space available for input and output mechanisms In this paper we present the results of a number of small studies which have investigated making the most of the input/output facilities of miniature devices. These cover: • data to guide the de...