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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Ergonomics Society of Korea
Journal Basic Information
Journal DOI :
The Ergonomics Society of Korea
Editor in Chief :
Volume & Issues
Volume 21, Issue 3 - Oct 2002
Volume 21, Issue 2 - Jul 2002
Volume 21, Issue 1 - Apr 2002
Selecting the target year
Comparison of Classification Models for Sequential Flight Test Results
Sohn, So-Young ; Cho, Yong-Kwan ; Choi, Sung-Ok ; Kim, Young-Joun ;
Journal of the Ergonomics Society of Korea, volume 21, issue 1, 2002, Pages 1~14
DOI : 10.5143/JESK.2002.21.1.001
The main purpose of this paper is to present selection criteria for ROK Airforce pilot training candidates in order to save costs involved in sequential pilot training. We use classification models such Decision Tree, Logistic Regression and Neural Network based on aptitude test results of 288 ROK Air Force applicants in 1994-1996. Different models are compared in terms of classification accuracy, ROC and Lift-value. Neural network is evaluated as the best model for each sequential flight test result while Logistic regression model outperforms the rest of them for discriminating the last flight test result. Therefore we suggest a pilot selection criterion based on this logistic regression. Overall. we find that the factors such as Attention Sharing, Speed Tracking, Machine Comprehension and Instrument Reading Ability having significant effects on the flight results. We expect that the use of our criteria can increase the effectiveness of flight resources.
Formulation of Human Manikin Models Representative of Korean Male Pilots
Lee, Jong-Sun ; Song, Young-Woong ;
Journal of the Ergonomics Society of Korea, volume 21, issue 1, 2002, Pages 15~26
DOI : 10.5143/JESK.2002.21.1.015
The anthropometric characteristics of the intended user population are most important parameters in the equipment and workplace layout design, particularly in the airplane cockpit design. Because human body is composed of multi-dimensional body segments, single `average` or `extreme` manikin is not sufficient in computer-aided design(CAD) environments. To overcome this limitation, we constructed a manikin group representing Korean Male pilot population. First, we identified 16 anthropometric variables which are important parameters in the evaluation of reach, visibility, and clearance. And we found their correlations and conducted a factor analysis. Four common factors were extracted in the factor analysis. The first one was related with length dimensions, the second was with the arm reach, the third was with the sitting height, and the last was with breadth-depth dimensions. Finally, 17 manikins were constructed and presented in the CAD prototype.
Fatigue Effect on Lifting Acceleration During Frequent Liftings
Kim, Young-Joun ;
Journal of the Ergonomics Society of Korea, volume 21, issue 1, 2002, Pages 27~32
DOI : 10.5143/JESK.2002.21.1.027
The objective of this study was to investigate the effects of fatigue, caused by frequent manual lifting. on lifting velocity and lifting acceleration. Ten male volunteers performed lifting at a rate of 4 times per minute, continuously, for two hours using the free-style posture A box(
) with a fixed weight (15.9 Kg) was used as the load for lifting, Heart rate, oxygen consumption, and EMG were also measured to estimate the level of fatigue, The posture as well as acceleration was recorded. The results showed that the lifting acceleration at the end of two hour increased significantly (20%, p<0.001) compared to the acceleration after fifteen minutes of lifting. It was also found that subjects changed their lifting postures as the result of fatigue. All subjects also indicated pain in their upper legs and the lower back at the conclusion of the experiment.
The effect of movement of the neck on the body surface variation
Kim, Hae-Kyung ; Park, Soon-Jee ; Suh, Chu-Yeon ; Suk, Eun-Young ;
Journal of the Ergonomics Society of Korea, volume 21, issue 1, 2002, Pages 33~49
DOI : 10.5143/JESK.2002.21.1.033
With the wide range of movement, the movement of neck accompanies the body surface change of neck and shoulders. And neck corresponds to the collar of garment, meaning that the body surface change of this part affects the construction of patterns for collars. So the purpose of this study was to manifest the changes of body surface in the neck and shoulder accompanied with the movement of the neck and to draw up the facts worth consideration when constructing the collar pattern. In this study, the draft of body surface of neck and shoulder was drawn up by gypsum method according to the 5 movements (standing at attention, neck bending - front, back, right, left). The length of body surface was measured and analyzed by ANOVA, post hoc test, correlation and regression analysis using SPSS 10.0 for Windows. The variation of the surface of neck was remarkable in the vertical lines than the horizontal ones. So the height of collar should be established considering the range of movement of the neck. It was the raising amount of c.f(center front) of neck and girth of neckbase (back) that were proved to have significantly varied after movement. With correlation analysis done, in every movement, the raising amount of side and the girth of neckbase had remarkably positive relation. The movement of the neck accompanied the variation of body surface in the shoulder as well. It was the part of scapula and side of neckbase that the variation was notable, suggesting that the surplus is needed in these parts.
Evaluation of Synthetic Voice which is Agreeable to the Ear Using Sensibility Ergonomics Method
Park, Yong-Kuk ; Kim, Jae-Kuk ; Jeon, Yong-Woong ; Cho, Am ;
Journal of the Ergonomics Society of Korea, volume 21, issue 1, 2002, Pages 51~65
DOI : 10.5143/JESK.2002.21.1.051
As the method of providing information is getting multimedia, the synthetic voice is used in not only CTI(Computer Telephony Integration), information service for the blind, but also applications on internet. But properties of synthetic voice, such as speech rate, pitch, timbre and so on, are not adjusted to customers` preference but providers` preference. In order to consider customers` preference, this study proposed four subjective factors of voice through the evaluation of voice using the method of sensibility ergonomics. And the relation synthetic voice to be agreeable to the ear with emotional images was formulated as a fuzzy model. Consequently, this study proposed the speech rate and pitch of synthetic voice which is agreeable to the ear.
A Study on the Development of Torso Pattern for an Automated Order-based Manufacturing System - focused on women in the twenties -
Hwan, Soo-Yeun ; Nam, Yun-Ja ;
Journal of the Ergonomics Society of Korea, volume 21, issue 1, 2002, Pages 67~80
DOI : 10.5143/JESK.2002.21.1.067
An efficient torso pattern has been developed to cope with the future trend of order-based, individualized production like the E.C.(Electronic Commerce) in the apparel industry, and to make a database foundation of automatic garment pattern drafting. For this purpose, a non-contact three-dimensional anthropometric measurement system was used to provide a lot of accurate body data for better individual fit, and an automatic pattern drafting system that can easily generate various size patterns and construct a pattern database has been developed too. The subjects of this research were 18 to 24 year-old women whose data had been gathered through the Korean national investigation of anthropometry for industrial standards in 1997 and various body shapes were analyzed by the measurements. And a special software system has been developed to verify the validity of newly proposed drawing rules. The results of sensory evaluation for appearance and moving fitness of the new torso pattern showed a significant improvement in individual fit even for the figures with large deviation from standard shape compared with the results of the traditional one.
Joint Angles of Comfort for Females Based on the Psychophysical Scaling Method
Kee, Do-Hyung ;
Journal of the Ergonomics Society of Korea, volume 21, issue 1, 2002, Pages 81~93
DOI : 10.5143/JESK.2002.21.1.081
This study aims to provide joint angles of comfort for females, based on the psychophysical scaling method. Ten female subjects participated in the experiment for measuring perceived discomfort for varying joint motions. The subjects were instructed to maintain given joint motions for a minute, and to rate their perceived discomfort for the motions during a minute`s rest by using the free modulus method of the magnitude estimation. Joint angles of comfort were calculated from the regression equations based on the experimental results, in which levels of joint motions were used as independent variables and perceived discomforts as dependent variables. The results showed that joint angles of comfort for the joint motions investigated were much smaller than full range of motions for corresponding joint motions. The ratios of joint angle of comfort to its range motion for the hip were found to be smallest of all joint motions dealt with in this study, and those for the neck were the largest. In addition, comfortable joint angles for females were much smaller than those for males. It is recommended that when designing or evaluating workplaces ergonomically, different comfortable joint angles should be applied according to workers` or population`s gender.
A Comparative Evaluation on Visual Performance of CRT and TFT-LCD as Desktop Computer Displays
Kim, Sang-Ho ; Choi, Kyung-Lim ;
Journal of the Ergonomics Society of Korea, volume 21, issue 1, 2002, Pages 95~112
DOI : 10.5143/JESK.2002.21.1.095
Two experiments were carried out to compare the suitability in visual tasks between cathode-ray tube (CRT) and thin film transistor-liquid crystal display (TFT-LCD). In the first experiment, the subjects were requested to detect pre-assigned target words or icons among distracters presented under time-invariant (static) image mode. The subjects` visual performance and fatigue were assessed while carrying out search tasks with dim and bright ambient light conditions. Significant interaction effects were found among displays, task types, and ambient light conditions. Due to visual fatigue, the subjects` accommodative power decreased in the end of task and the degradation was more significant for the CRT users and under bright ambient light. IN the second experiment, the subjects performed information processing task with time-varying road signs at a driving simulator to assess interaction effects between display types and changing speed of dynamic image. The perception time using TFT-TCD was shorter under slow image change while that of CRT was shorter rapid image change. Findings from this study suggest that, to improve visual task performance, users should carefully select their visual display type depending on the task to be performed.