Abstract
This paper describes the design and implementation of a control-theoretic model that can be used to model both the discrete and continuous behavior of a human operator. The human operator model can be used to compare different device user interfaces in terms of human performance. The implemented human operator model combines an ON-OFF control model and a behavior-based hybrid automaton with three controllers. The controllers, defined as continuous, discrete, and fine-tuning behavior, simulate the user's conceptual model of the user interface. The device model used is that of a commercial syringe pump with chevron keys, described as a formal specification. Results of the human operator model simulation were generated for 20 different numbers obtained from syringe pump log files. The simulation results were compared over 33 trials to a lab study employing a device based on the formal specification. The result of the simulation shows a significant similarity to the result of the lab study for all the numbers used.
Highlights
U P–DOWN buttons are a ubiquitous user interface input method, used in everything from microwave ovens to safety-critical medical devices
We present a technique based on hybrid automata where discrete and continuous quantities of an interactive system are taken into account
In the remainder of this paper, we discuss the implementation of our human operator model, a device model that interacts with the human operator model and the results of a model validation study, where the human operator model is compared with a lab study
Summary
U P–DOWN buttons are a ubiquitous user interface input method, used in everything from microwave ovens to safety-critical medical devices. When used to enter numeric data, like times or rates, up–down buttons and their extended version, chevron keys, are defined as an incremental number entry method [1]. There are a number of well-explored approaches in human–computer interaction (HCI) to model human operator behavior based on, for example, device interfaces, cognitive models, and task-analytic models in interaction with numeric keypads. Both the continuous and discrete behavior of a human operator, using a chevron-key interface on a medical device. The paper is organized as follows: First, we discuss the related work on user modeling, manual control theory, and hybrid automata.
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