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Determinants of User Satisfaction with Mobile VR Headsets
Jinhae Choi,Katie Kahyun Lee,Junho Choi 한국콘텐츠학회 2019 International Journal of Contents Vol.15 No.1
Since the VR market is expected to have a high growth, this study aimed to investigate the human factor-related determinants of user satisfaction with mobile VR headsets. A pre-study of customer reviews was conducted with the help of semantic network analysis to identify the core keywords for understanding negative and positive predictors of mobile VR headset experiences. Through laboratory testing with three different commercial models, the main study measured and identified the predictors of user satisfaction. From the results, five factors were extracted as valid predictor variables and used for regression analysis. These factors were immersion, VR sickness, usability, wear-ability and menu navigation interface. All the five predictors were proved to be significant determinants of the perceived user satisfaction with mobile VR headsets. Usability was the strongest predictor, followed by VR sickness and wearability. Practical and theoretical implications of the results were discussed
Jinhae Choi 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.2
Objective: This study aims to compare the usability of the adaptive touch design method with that of the height adjustable design method that are applied to the Korean QWERTY keyboard and Naratgul keyboard on smartphones, examine the results, and present practical implications. Background: Smartphone manufacturers have failed to satisfy every user with their uniform touch keyboard designs that do not consider the high use rates of keypad use. In reality, touch keyboard designing customized for every individual is impossible, but there need to be researches on was to improve usability by having touch areas changed automatically depending on user behaviors or having users adjust the keyboard height depending on their hand size. Method: As for the design methods, an object group was given smartphones with the adaptive touch design method and the other group those with the height adjustable design method. As they entered the same characters in the smartphones, typing error rates and text input speed were measured and the average values were compared. 35 individuals who would frequently use smartphones in daily life participated in the experiment. The group variable was the type of touch keyboards, and the test variables were typing error rates and text input speed, for which a T-test was implemented. Results: As for the QWERTY keyboard, the significant improvement effect was verified as the typing error rate of the adaptive touch design method was 4.21% but that of the height adjustable design method was 3.28% although there was no significant difference in terms of text input speed. As for the Naratgul keyboard, in contrast, the typing error rate of the adaptive touch design method was 2.5% while that of the height adjustable design method was 1.48%, which indicates a measure of improvement, but the effect was not significant. On the other hand, the text input speed per minute was improved as much as 22.2%, which is significant. Conclusion: First, the Korean touch keyboard usability of the adaptive touch design method and that of the height adjustable design method, when applied to Model A of Company L, showed significant difference from each other. Second, the height adjustable design method was applied to the QWERTY keyboard, the typing error rate was improved significantly. This indicates that as the keyboard height was raised, the number of buttons within the range of fingering decreased, decreasing the touch bias was reduced. Third, the height adjustable design method was applied to the Naratgul keyboard, the text input speed was improved. Application: When the QWERTY keyboard was applied to a smartphone as small as 5.5inch or less, it is highly probably that the height adjustable design method decreases the typing error rate. It may be considered to develop additional UX functions to make the keyboard font larger or give users the option to adjust button intervals in utilization of the SW advantages of the height adjustable design method.
A LOCAL MINIMIZER IN SMECTIC LIQUID CRYSTALS
Jinhae Park 충청수학회 2018 충청수학회지 Vol.31 No.1
In this paper, we consider a simplified energy functional for ferroelectric liquid crystals. With a special ansatz, we study existence of local minimizer with a certain symmetry.
WEAK SOLUTIONS OF GRADIENT FLOW OF LANDAU-DE GENNES ENERGY
Jinhae Park 충청수학회 2013 충청수학회지 Vol.26 No.3
Taking into account the °exoelectric e??ects, we con- sider a gradient °ow of Landau-de Gennes energy which generalizes the Oseen-Frank energy. In this article, we discuss existence of weak solutions of the gradient °ow in an appropriate function space.
VARIOUS FERROELECTRIC CONFIGURATIONS IN LIQUID CRYSTALS
Jinhae Park 충청수학회 2014 충청수학회지 Vol.27 No.4
In this paper, we study ferroelectric congurations ofliquid crystals by nonlocal interaction energy associated with the polarization.
The Natural Way of Gestures for Interacting with Smart TV
Jinhae Choi,Jiyoung Hong 대한인간공학회 2012 大韓人間工學會誌 Vol.31 No.4
Objective: The aim of this study is to get an optimal mental model by investigating user"s natural behavior for controlling smart TV by mid-air gestures and to identify which factor is most important for controlling behavior. Background: A lot of TV companies are trying to find simple controlling method for complex smart TV. Although plenty of gesture studies proposing they could get possible alternatives to resolve this pain-point, however, there is no fitted gesture work for smart TV market. So it is needed to find optimal gestures for it. Method: (1) Eliciting core control scene by in-house study. (2) Observe and analyse 20 users" natural behavior as types of hand-held devices and control scene. We also made taxonomies for gestures. Results: Users" are trying to do more manipulative gestures than symbolic gestures when they try to continuous control. Conclusion: The most natural way to control smart TV on the remote with gestures is give user a mental model grabbing and manipulating virtual objects in the mid-air. Application: The results of this work might help to make gesture interaction guidelines for smart TV.
NONLOCAL EFFECT IN LIQUID CRYSTALS
Jinhae Park 충청수학회 2014 충청수학회지 Vol.27 No.3
In this paper, we investigate the role of nonlocal inter-action energy on nucleations of periodic solutions in a one-dimensional problem arising in smectic liquid crystals.
VARIOUS FERROELECTRIC CONFIGURATIONS IN LIQUID CRYSTALS
Park, Jinhae Chungcheong Mathematical Society 2014 충청수학회지 Vol.27 No.4
In this paper, we study ferroelectric configurations of liquid crystals by nonlocal interaction energy associated with the polarization.