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- 저자 : 이휘우 (검색결과 3 건)
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이휘우(Hwi Woo Lee),정은영(Eun Young Chung),박관용(Kwan Yong Park),임영재(Young Jae Im),정의승(Eui Seung Jung) 대한인간공학회 2021 大韓人間工學會誌 Vol.40 No.6
Objective: The goal of this research is to study the driver"s acceptable level of vibration intensity and duration as haptic feedback during conditional automated driving. Background: Gradually, the driving of a vehicle is being automated, which frees the driver from driving. As various activities become possible as non-driving related activities (NDRAs) in the vehicle, driver"s attention level gets lowered and accordingly, visual, auditory, and tactile-based feedback must be properly provided. Unlike visual and auditory information, which can interfere with driver"s concentration and confuse situational awareness due to information from many systems, tactile feedback is presented as an important feedback method in a way that can improve the efficiency of information delivery about safety. However, although there are various situations in which the driver is informed of the change of control right in the NDRT (Non-Driving Related Task) situation, there is still a lack of research about the intensity and duration as haptic feedback. Method: By establishing an experimental environment similar to that of a vehicle, the vibration actuators were placed on the seat in a 2 × 2 arrangement on the seat pan and seat back. The vibration was implemented using Arduino equipment and PWM control. The experiment was conducted by combining the independent variables, the intensity of vibration (1~5V), and the level of stimulation time(1.5s, 2.5s, 3.5s, 4.5s). Dependent variables, Error rate and Preference were selected, and Preference for the seat vibration stimulus position (1. Seat back & pan, 2. Seat back, 3. Seat pan) was investigated. Preferences were all collected on a 7-point likert scale. Results: Through ANOVA analysis, there were significant differences in the intensity of vibration, stimulation time, and the interaction between the two variables, and there was no significant difference in gender or age. Subjects were able to identify vibrations from 3V, and in the case of stimulation time of 3.5s was the most preferred at 3V and 4V, which recognize most vibrations, and 1.5s and 4.5s had lower preferences. At 5V, 2.5s was the most preferred, and from 3.5s the preference decreased sharply. In the case of the vibration stimulation position of the seat, the seat back had the highest preference, and in the case of the seat pan, the preference was very lower than that of the seat back and seat back & pan. Conclusion: In this study, the minimum level for recognizing the vibration stimulation of the haptic feedback in the vehicle seat and the optimal stimulation time according to the vibration intensity was investigated through experiments, and the range that could accommodate the haptic feedback was derived. Application: Based on the results of the vibration stimulation level and stimulation time level for the haptic feedback of the vehicle seat in this study, it can be used as a reference index when designing the haptic feedback of the vehicle in the future.
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오픈형 무선이어폰의 설계 범위 설정을 위한 귀 형상의 인체공학적 분석
박관용,반기민,이휘우,정의승 대한인간공학회 2021 大韓人間工學會誌 Vol.40 No.6
Objective: This study investigates the relationship between ear anthropometry and design specifications of open-type wireless earbuds for optimum fit. Background: Recently, wireless open-type earbuds have been provided in a single size, unlike in the past were provided the size variations of earbuds. However, since the ear is a part of the human body with significant individual differences, issues regarding pain and fixation occur, especially when walking and running while wearing wireless earbuds. It is essential to understand the relationship between the cavum concha of the ear and the corresponding design specifications of the earbuds to relieve the user's pain and provide an optimal fit. The existing studies about earbuds focus on kernel-type and hook-type, which considered only the width and height, the design specifications of earbuds. They did not consider the influence of the depth of the earbuds. This study included the width, height, and depth and investigated the effect of design specifications on the cavum concha of the ear. Method: Thirty-six participants' cavum concha dimensions were measured and asked to evaluate discomfort and overall preference on a 101-point scale by wearing 20 mock-ups of open-type wireless earbuds. Results: There are four clusters of cavum concha dimensions using hierarchical clustering and k-means clustering, and silhouette score was used to evaluate the quality of the clusters. Also, response surface methodology was used to find out the reasonable design specifications of the earbuds. Conclusion: Through an experiment, the study reviewed the interaction between the type of concha and the product's design specifications when wearing an opentype wireless earbud. As a result, the research discovered the effect of main factor and interaction on wearing open-type wireless earbuds. Application: The result of the study can be applied when determining design specifications of open-type wireless earbuds for a comfortable fit and for ear-related products as well.
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