2017 年 53 巻 Supplement2 号 p. S470-S473
A console of a submarine is a collection of user interfaces composed of control devices and two vertically installed displays. Since console operators receive most visual information from these displays for a long time, it may cause musculoskeletal disorders and psychological discomfort if the screen is not in the right position. Therefore, the aim of this study is to derive optimal design values for the position and tilting angle of displays. We identified the environmental constraints of control room and the visual angle of the operators. In addition, we considered the physical characteristics of target user population. Thus, we used anthropometric data of Korean males aged from 20s to 30s, who are representative user segments that operates the console. Tasks were divided into ‘direction’ tasks that operators usually perform, and ‘detection’ tasks, which should be performed in case of emergencies. The variables of monitor height, maximum vertical height, work surface height, eye height, and distance between eye and monitor were selected, and conditional equations were established with consideration of design factors and environmental constraints. With these equations, the optimal value was derived through a GRG (Generalized Reduced Gradient) method. After, we evaluated the appropriateness of the proposed optimal values with a full-scale mockup of a console. 10 ergonomics experts conducted usability test, and reaction time (RT) as well as electromyography (EMG) activity of the cervical vertebral were measured during the experiment. As a result, participants reacted within a fairly short time with little fatigue on the cervical vertebral. Overall, we successfully suggested the optimal ranges of tilting angles for two vertically arranged monitors while considering context-of-use, anthropometric characteristics of South Koreans, and human visual characteristics.