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Dive into the research topics where Seikwon Park is active.

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Featured researches published by Seikwon Park.


Ergonomics | 2013

An anthropometric analysis of Korean male helicopter pilots for helicopter cockpit design

Wonsup Lee; Kihyo Jung; Jeong-Rim Jeong; Jangwoon Park; Jayoung Cho; Hee-Eun Kim; Seikwon Park; Heecheon You

This study measured 21 anthropometric dimensions (ADs) of 94 Korean male helicopter pilots in their 20s to 40s and compared them with corresponding measurements of Korean male civilians and the US Army male personnel. The ADs and the sample size of the anthropometric survey were determined by a four-step process: (1) selection of ADs related to helicopter cockpit design, (2) evaluation of the importance of each AD, (3) calculation of required sample sizes for selected precision levels and (4) determination of an appropriate sample size by considering both the AD importance evaluation results and the sample size requirements. The anthropometric comparison reveals that the Korean helicopter pilots are larger (ratio of means = 1.01–1.08) and less dispersed (ratio of standard deviations = 0.71–0.93) than the Korean male civilians and that they are shorter in stature (0.99), have shorter upper limbs (0.89–0.96) and lower limbs (0.93–0.97), but are taller on sitting height, sitting eye height and acromial height (1.01–1.03), and less dispersed (0.68–0.97) than the US Army personnel. Practitioner summary: The anthropometric characteristics of Korean male helicopter pilots were compared with those of Korean male civilians and US Army male personnel. The sample size determination process and the anthropometric comparison results presented in this study are useful to design an anthropometric survey and a helicopter cockpit layout, respectively.


Ergonomics | 2013

Analysis of the facial measurements of Korean Air Force pilots for oxygen mask design

Wonsup Lee; Jeong-Rim Jeong; Jangwoon Park; Eunjin Jeon; Hee-Eun Kim; Daehan Jung; Seikwon Park; Heecheon You

This study measured the facial dimensions of Korean Air Force (KAF) pilots, to design a pilot oxygen mask, and compared them with those of Korean civilians and US Air Force (USAF) personnel. Twenty-two facial dimensions were measured for 278 KAF male pilots (KMP) and 58 KAF female pilots and cadets (KFP) using an anthropometer and a three-dimensional scanner. The KMP face measurements were found to be significantly larger (mean difference, = 0.7–26.5 mm) and less varied (ratio of SDs = 0.29–0.82) than those of Korean male civilians. The average face length, lip width and nasal root breadth of the KMP were significantly longer ( = 4.7 mm), narrower ( = − 2.4 mm), and wider ( = 5.2 mm), respectively, than those of USAF male personnel. Lastly, the KMP face measurements were significantly larger ( = 1.8–26.1 mm) than those of the KFP. Practitioner Summary: The face measurements of KAF pilots were collected and compared with those of Korean civilians and USAF personnel. The distinct facial features of the populations identified in this study are applicable to custom design of an oxygen mask for prevention of excessive pressure and oxygen leakage.


Proceedings of the Human Factors and Ergonomics Society Annual Meeting | 2000

A Comprehensive risk Assessment Model for Work-Related Musculoskeletal Disorders of the Upper Extremities

Andris Freivalds; Yong-Ku Kong; Heecheon You; Seikwon Park

A quantitative risk assessment model determining the likelihood of incurring work-related musculoskeletal disorders of the upper extremities has been developed based on grip force and hand motion data input from an innovative ‘touch glove’. This glove utilizes a commercial CyberGlove to measure hand and finger movements and UniForce pressure sensors to measure grip pressure during work. These are incorporated directly on-line to a laptop with the risk assessment model leading to a predicted incidence rate. The model explains 50% of the variance due to job stressors, with the remaining variability due to individual and psychosocial factors. These were examined in a pilot case-control retrospective epidemiological study of 97 participants, reducing the unexplained variability to almost less than 10%.


Proceedings of the Human Factors and Ergonomics Society Annual Meeting | 2013

Ergonomic Design and Evaluation of a Pilot Oxygen Mask

Wonsup Lee; Hee-Eun Kim; Daehan Jung; Seikwon Park; Heecheon You

The present study developed a virtual fit assessment (VFA) method to design an oxygen mask which fits Korean Air Force (KAF) pilots. The VFA method used 3D face scan data of 336 KAF pilots to find the most proper shape of an oxygen mask for KAF pilots. The oxygen mask design revised in the study showed a 27% design improvement effect on average in terms of fit evaluated by the VFA method. Additionally, the present study evaluated the revised oxygen mask prototypes with 88 KAF pilots to experimentally verify the design improvement effect in terms of discomfort, pressure, and suitability for military equipment (slippage and stability in flight-like situations). The discomfort of the revised mask was 33 ~ 56% lower on average than the existing oxygen mask. In terms of the pressure, the revised mask showed 11 ~ 33% of improvement on average compared to the existing mask. Furthermore, on high gravity situation, the slippage distance of the revised mask was 24% shorter on average than the existing mask. The proposed VFA method can be applied to the design and evaluation of wearable products that require an ergonomically better fit for a target population.


Applied Ergonomics | 2017

Classification of a Driver's cognitive workload levels using artificial neural network on ECG signals

Amir Tjolleng; Kihyo Jung; Wongi Hong; Wonsup Lee; Baekhee Lee; Heecheon You; Joonwoo Son; Seikwon Park

An artificial neural network (ANN) model was developed in the present study to classify the level of a drivers cognitive workload based on electrocardiography (ECG). ECG signals were measured on 15 male participants while they performed a simulated driving task as a primary task with/without an N-back task as a secondary task. Three time-domain ECG measures (mean inter-beat interval (IBI), standard deviation of IBIs, and root mean squared difference of adjacent IBIs) and three frequencydomain ECG measures (power in low frequency, power in high frequency, and ratio of power in low and high frequencies) were calculated. To compensate for individual differences in heart response during the driving tasks, a three-step data processing procedure was performed to ECG signals of each participant: (1) selection of two most sensitive ECG measures, (2) definition of three (low, medium, and high) cognitive workload levels, and (3) normalization of the selected ECG measures. An ANN model was constructed using a feed-forward network and scaled conjugate gradient as a back-propagation learning rule. The accuracy of the ANN classification model was found satisfactory for learning data (95%) and testing data (82%).


Proceedings of the Human Factors and Ergonomics Society Annual Meeting | 2012

Analysis of the Facial Anthropometric Data of Korean Pilots for Oxygen Mask Design

Wonsup Lee; Jangwoon Park; Jeong-Rim Jeong; Eunjin Jeon; Hee-Eun Kim; Seikwon Park; Heecheon You

The present study measured Korean pilots’ facial dimensions to design a pilot oxygen mask which would fit Korean pilots, and compared Korean pilots’ facial dimensions to Korean male civilians and US male pilots’ facial characteristics. The present study selected the 22 facial anthropometric dimensions related to oxygen mask design by referring to previous studies. The facial dimensions of 366 Korean male and female pilots (including 52 female cadets of the Korean Air Force Academy) were measured using Martin’s anthropometer and 3D scanner. Korean male pilots’ faces were significantly larger (mean difference = 1.3 ~ 27.0 mm) and less variable (ratio in SD = 0.29 ~ 0.85) than Korean male civilians’ faces (α = 0.05), which indicates that facial anthropometric data derived from Korean pilots should be used to design the oxygen mask for Korean pilots. In terms of criteria of the oxygen mask sizing system which is currently based upon the US Air Force anthropometric data (face length and lip width), Korean male pilots were significantly longer on face length (mean difference = 4.7 mm) and narrower on lip width (mean difference = -2.4 mm) than US male pilots (α = 0.05), which indicates that the oxygen mask sizing system as well as the oxygen mask shape should be changed for Korean pilots. Additionally, Korean male pilots have wider nasal roots (mean difference = 5.2 mm) than US male pilots, which indicates that the shape of nose of the current oxygen mask should be widened. Lastly, Korean female pilots’ facial dimensions were significantly smaller (mean difference = 0.6 ~ 26.1 mm) than Korean male pilots (α = 0.05), which indicates that Korean female pilots’ facial characteristics need to be considered in the design of oxygen masks which fit Korean pilots.


Journal of Korean Institute of Industrial Engineers | 2014

Development of an Evaluation Method for a Driver’s Cognitive Workload Using ECG Signal

Wongi Hong; Wonsup Lee; Kihyo Jung; Baekhee Lee; Jangwoon Park; Suwan Park; Yunsuk Park; Joonwoo Son; Seikwon Park; Heecheon You

Objective: The present study is to develop an effective evaluation method for a driver’s cognitive workload using electrocardiography (ECG) signal. Background: ECG measures such as heart rate (HR) and heart rate variability (HRV) have been used for cognitive workload evaluation. Since ECG changes by cognitive workload vary largely depending on personal characteristics, an optimal analysis protocol of ECG needs to be tailored to each individual accordingly; however, existing studies have not considered personal characteristics in ECG analysis for cognitive workload evaluation. Method: The proposed evaluation method uses the area under the receiver operating characteristic (ROC) curve (AUC). A preliminary analysis was conducted with ECG data collected in a driving simulator while an n-back task was conducted. AUC analysis was performed for four ECG metrics (mean IBI, SDNN, RMSSD, and RMSE), three window spans (20, 30, and 40 seconds), and three update rates (1, 2, and 3 seconds). Results: It was identified that the optimal ECG analysis parameters of metric, window span, and update rate maximizing the discriminability of cognitive workload evaluation varied between individual drivers. Conclusion: The finding of the present study supports the use of an individually customized ECG analysis protocol for better evaluation accuracy of a drivers’ cognitive workload. Application: The proposed ECG analysis method for cognitive workload evaluation can be applied to development of a safe driving support system.


Journal of The Ergonomics Society of Korea | 2007

Relationship between Physiological Response and Salivary Cortisol Level to Life Stress

Seikwon Park; Dongsoo Kim

The physiological and biochemical responses of healthy men and women to life stress were measured in order to investigate the correlation between these two responses under the normal situation. Heart rate variability (HRV), skin temperature, blood pressure (BP), heart rate (HR) and galvanic skin response (GSR) were selected as physiological stress indices and salivary cortisol level was used as a biochemical stress biomarker. Twenty six (male 14 and female 13) college students were participated in the experiment. Female showed the significant higher value of salivary cortisol level (p<0.01), diastolic BP (p<0.01), and HR (p<0.01) than male. The difference of skin temperature between forehead and fingertip correlated significantly with salivary cortisol level (p<0.01). The LF(low frequency)/HF(high frequency) ratio of HRV also correlated significantly with salivary cortisol level (p<0.01). However, BP, HR and GSR correlated insignificantly with salivary cortisol level. We suggest that LF/HF ratio of HRV and skin temperature may be good indices for the assessment of life stress, and may apply to measure the stress level of individual in real time.


Proceedings of the Human Factors and Ergonomics Society Annual Meeting | 2011

An Ergonomic Design of Flight Suit Pattern According to Wearing characteristics

Eunjin Jeon; Jeong rim Jeong; Hee-Eun Kim; Seikwon Park; Heecheon You

The purpose of this research is to conduct a survey of the wearing characteristics of flight suits from current pilots and to design from this survey a new flight suit pattern suitable for the physical characteristics of Korean pilots. A pool of 563 pilots was surveyed in order to analyze the wearing characteristics. In order to confirm the improved effects of the newly designed suit compared to the current one, an evaluation was conducted by assessing the subjective satisfaction and objective functionality through a measurement of the range of motion. Results of the evaluation have shown that significant improvements have been made in the areas of suit that many of the respondents had indicated as being uncomfortable, such as neck circumference, armscye circumference, and crotch. This was achieved through increasing the ease in respective parts of the suit using anthropometric data of the pilot in the design process, thus correcting the pattern of the uncomfortable areas. The areas that showed the greatest improvements were the ones associated with lengthwise mobility; the fit and the mobility of the overall flight suits have ameliorated by a significant degree.


Fashion & Textile Research Journal | 2014

Wearing Characteristic Evaluation of Hip Protector for Hip Fracture Prevention

Eunjin Jeon; Seikwon Park; Heecheon You; Hee-Eun Kim

We surveyed the wearing characteristics of hip protectors. The problems of existing hip protectors were identified and the directions for improvement were presented. The evaluation of wearing characteristics was conducted on the 100 elderly women (60 to 85 years) with 5 types of hip protector. The questionnaire was composed of history and characteristics on falling, hip protector acceptance, preference, use characteristics and improvement requirements. The result of wearing characteristic evaluation indicated that 52% of the subject experienced falling in winter. Incidents resulting from falling occurred: outdoors (74.5%), bathroom (10.9%), and kitchen (5.5%). Body parts to be protected were in several areas: 35.6% for lumbar, 26.9% for hip joint, and 15% for hip bone. Participants prefer a belt B type design at a rate of 56.9% because it provided a sense of stability by clinging to the body and upholding the waist. Belt B type was the most appropriate in terms of fit, allowance, mobility, and design except pad thickness. To reduce the risk of hip fracture, hip protector needs to be designed in consideration of users type of fall and body shape. The pattern and size of a hip protector has to be improved in regards to the amount of discomfort. An objective evaluation is needed for the ergonomic design of a hip protector based on and analysis of 3D body image of the elderly and the shock-absorbing quality of pad.

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Heecheon You

Korea Aerospace Industries

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Hee-Eun Kim

Kyungpook National University

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Eunjin Jeon

Pohang University of Science and Technology

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Daehan Jung

Korea Air Force Academy

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Wonsup Lee

Delft University of Technology

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Wonsup Lee

Delft University of Technology

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Baekhee Lee

Pohang University of Science and Technology

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