A Comparison of Visual Occlusion Methods

Jungchul Park 대한인간공학회 2011 大韓人間工學會誌 Vol.30 No.5

Objective: This study compares two visual occlusion methods for the evaluation of in-vehicle interfaces. Background: Visual occlusion is a visual demand measuring technique which uses periodic vision/occlusion cycle to simulate a driving(or mobile) environment. It has been widely used for the evaluation of in-vehicle interfaces. There are two major implementation methods for this technique: (1) occlusion using PLATO(portable liquid crystal apparatus for tachistoscopic occlusion) goggles; (2) occlusion using a software application on a touchscreen device. Method: An experiment was conducted to examine the visual demand of an in-vehicle interface prototype using the goggle-based and the touchscreen-based occlusion methods. Address input and radio tuning tasks were evaluated in the experiment. Results: The results showed that, for the radio tuning task, there were no significant differences in total shutter open time and resumability ratio between the two occlusion conditions. However, it took longer for the participants to input addresses with the touchscreen-based occlusion. Conclusion & Application: The results suggest that touchscreen-based method could be used as an alternative to traditional, goggle-based visual occlusion especially in less demanding visual tasks such as radio tuning.

Developing a Quantitative Performance Model of the Use of Adaptive and Adaptable Menu Interfaces

( Jungchul Park ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-

This study proposes a quantitative model to estimate the performance of using adaptive and adaptable menus. Modeling of the usage pattern of the target user using the device developed enables the quantitative evaluation of design alternatives without incorporating a usability test, which may not be possible due to the limitation of budget and/or time, confidentiality of the development project, and the unavailability of the participants representing the target population. This study develops quantitative models based on multiple linear regression analysis for traditional, adaptive, and adaptable menu interfaces. Modification of the interface by the user or the system itself may potentially have positive or negative effects on the usability. Models which represent both the perceptual/motor and cognitive performance of using adaptable and adaptive menus are developed by analyzing the quantitative results of an experiment involving users. The positive and negative effects such as shorter or longer menu selection time, more or less frequent number of errors, and increased or decreased ease of learning, can be defined as the benefits and the costs of the adaptation. The effectiveness of the different adaptation strategies adopted by a user and a system are evaluated by comparing their adaptation behavior with the optimal one suggested by the model.

Developing a Quantitative Performance Model of the Use of Adaptive and Adaptable Menu Interfaces

Jungchul Park 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5

Analysis of Major Industrial Accidents in Chemical Facilities Based on Human Error Classification Framework

Jungchul Park,Seung-Kwon Hong,Jongbae Baek,Ingie Hong,Keun Won Lee,Woosub Han 대한인간공학회 2013 대한인간공학회 학술대회논문집 Vol.2013 No.10

Objective: The aim of this study is to develop a human error classification framework for chemical facilities and to apply it to major industrial accidents in chemical facilities in Korea. Background: Human errors can be classified with various criteria such as human information processing procedure by which the error was caused, explicit form of the error behaviour, and the consequence of the error. Method: Three human error classification criteria was chosen to classify human errors in major industrial accidents in chemical facilities: active vs. latent errors, external (behavior-based) classification, and internal (information processing-based) classification. Major industrial accidents which occurred in chemical facilities in Korea from 1997 to 2011 were analysed. Results: A total of 177 human errors were identified from 85 accident cases, and classified using the three criteria. Conclusion: Change in the number of human errors and frequencies of related facilities and industries were analysed. Application: The results provide insight on the pattern of human errors related to major industrial accidents in chemical facilities. In addition, they suggest that the accident investigation protocol is need to be improved.

Development of a web-based user experience evaluation system for home appliances

Park, Joohwan,Han, Sung H.,Park, Jungchul,Park, Jaehyun,Kwahk, Jiyoung,Lee, Mingyu,Jeong, Dong Yeong Elsevier 2018 International journal of industrial ergonomics Vol.67 No.-

<P><B>Abstract</B></P> <P>Although the home appliance industry is globally growing, there are many cases where the companies do not have user experience (UX) specialists enough to cover all their product lineups, and often the costs are too high for external referrals. The objective of the study is to provide a system to evaluate user experience (UX) for home appliance enterprises. The goal of the proposed system is to provide professional diagnosis and feedback to improve UX with home appliances, based on the usability, affect, and user value principles. A questionnaire composed of 109 items was developed for UX evaluation of home appliances by considering design elements and design principles together. A web-based UX evaluation system was developed by using the questionnaire items, and its usability as well as face validity were evaluated by nine domain experts and nine product designers as acceptable.</P> <P><B>Relevance to Industry</B></P> <P>The proposed system is expected to provide useful information for design improvement in the product planning and design phases of home appliance enterprises.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Design elements and UX design principles of home appliances were identified. </LI> <LI> 109 questionnaire items were developed for UX evaluation of home appliances. </LI> <LI> A web-based UX evaluation system was developed by using the questionnaire items. </LI> <LI> Experts and designers evaluated usability and validity of the system as acceptable. </LI> </UL> </P>

Factors influencing the proprioceptive acuity of hazard button pressing

Jungchul Park 대한인간공학회 2015 대한인간공학회 학술대회논문집 Vol.2015 No.10

본 연구는 시각 정보를 활용할 수 없는 상황에서 고유수용성감각(Proprioception)에 의한 조작 작업의 수행도에 영향을 미치는 인자에 대해 분석하고, 이를 차량의 비상 버튼 설계에 적용하기 위한 실험 계획을 수립한다. 고유수용성감각은 자신의 신체 각 부분의 위치와 움직임을 감지하는 신체 내부의 자극에 대한 감각으로서, 시각적인 정보가 없는 환경에서의 작업에 있어서 중요한 역할을 수행한다. 특히, 비상 상황에서 작업자는 전방의 상황을 주시해야 하기 때문에 시각의 도움 없이 고유수용성감각에 의존해 비상 조작장치를 작동시켜야 하는 경우가 많다. 이러한 상황에서 비상 조작장치를 빠르고 정확하게 조작하기 위해서는 조작장치를 설계할 때 고유수용성감각과 관련된 요인들을 충분히 고려하여야 한다. 본 연구에서는 고유수용성감각과 관련된 다양한 분야의 연구에 대한 분석을 통해 비상 조작장치의 조작 정확도와 속도에 영향을 미칠 수 있는 다양한 요인을 파악하고, 기존의 재활의학 분야 등에서 활용되고 있는 Joint Position Matching 방법을 변형하여 자동차 비상 버튼의 Layout 설계 대안을 평가할 수 있는 실험 계획을 수립한다. 본 연구의 결과는 추후 비상 조작장치의 설계 대안을 평가하는 실험에 직접적으로 활용될 수 있으며, 수행도를 결정하는 요인에 대한 분석 결과는 추후 고유수용성감각에 의한 위치 제어 작업의 가능성을 탐색하기 위한 이론적 바탕을 제공한다.

도시가스 정압기를 소재로 한 가상현실(VR) 안전교육 콘텐츠 설계 - 사용자 중심 디자인을 기반으로 -

서정철(Jungchul Suh),박찬영(Chanyoung Park),장선희(Sunhee Chang),장효진(Hyojin Chang),박민수(Minsoo Park) 한국가스학회 2021 한국가스학회 학술대회논문집 Vol.2021 No.11

적응형 크루즈컨트롤 기능의 운전자 정보요구사항 분석 및 시각화에 관한 연구

박정철(Jungchul Park) 대한인간공학회 2019 대한인간공학회 학술대회논문집 Vol.2019 No.10

차내 정보 시스템의 시각적 요구 평가를 위한 사용자 주도의 시각 차폐 기법

박정철(Jungchul Park) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.3

Visual occlusion method is a visual demand measuring technique which uses periodic vision/occlusion cycle to simulate driving environment. It became one of the most popular techniques for the evaluation of in-vehicle interfaces due to its robustness and cost-effectiveness. However, it has a limitation in that the vision/occlusion cycle forces the user to use the IVIS at a predetermined pace, while a driver decides when to use the device on his/her own in actual driving. This paper proposes a user-driven visual occlusion method for measuring the visual demand of in-vehicle interfaces. An experiment was conducted to examine the visual demand of an in-vehicle interface prototype using both the existing (system-driven) occlusion method and the proposed (user-driven) one. Two in-vehicle tasks were evaluated: address input and radio tuning. The results showed that, for the radio tuning task, there were significant differences in total shutter open time and resumability ratio between the methods. The user-driven visual occlusion method not only allows a better representation of drivers' behavior, but it also seems to provide more information on the chunkability of a task.

첨단운전지원시스템의 제어권 이양에 대한 리뷰

박정철(Jungchul Park) 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.6

Objective: The aim of this study is to review the existing studies on the user interface of advanced driver assistance systems (ADAS), especially focusing on the transitions of control authority. It also suggests some implications for the interface design. Background: With the advent of autonomous driving and the increasing adoption of ADAS, the importance of ergonomic design for the driver interface of ADAS is increasingly emphasized. Method: In this study, recent studies on the ADAS interface were reviewed in three aspects (the effect of automation level, the display design/evaluation, and control design/evaluation). Existing models of the allocation of control authority between driver and vehicle were also examined. Results: Various results have been obtained due to differences in experimental conditions and environments. However, in general, as the level of automation by ADAS increases, the workload decreases, while the level of situation awareness decreases and the response time increases. Motivations for the control authority transition and implications for the interface design are discussed. Conclusion: The interface that effectively monitors and presents the performance and conditions of the driver and the system is expected to provide assistance in various situations of authority transition. Application: The results of this study might help to explore, understand, and refine related research topics.