• 융합신호처리학회논문지
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• 제23권3호
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• pp.115-122
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• 2022

몇 년 전 코로나가 발병하면서 화상 회의, 전자 문서 작업이 많아지게 되었고 이 때문에 현대인들의 하루 일과 중에서 컴퓨터 작업을 하는 비중이 증가하고 있다. 하지만 오랜 시간 동안 잘못된 자세로 컴퓨터 작업을 하는 사람들이 많아지게 되면서 시력 저하, 거북목증후군 환자들이 늘고 있다. 최근까지도 자세 교정을 위한 연구들이 많이 발표되고 있지만 대부분은 사용자가 장비를 착용하여 자세 교정을 해야 하므로 사용자가 불편함을 겪을 수 있다는 한계가 있다. 본 논문에서는 초음파 센서 장치를 이용하여 컴퓨터 모니터와 사람 사이의 최소 거리 접근을 방지하기 위한 자세 교정 센서 시스템을 제안한다. 그리고 이때 최소 거리 시 울리는 경고 알람 중 오류 알람을 최소화하는 알고리즘도 함께 제안한다. 이는 초음파 센서 장치를 이용하기 때문에 몸에 기기를 부착하지 않고도 자세 교정을 할 수 있으며 사용자의 불편함을 해소할 수 있다는 장점이 있다. 또한, 실험 결과에서 거리 측정 시 발생한 잡음을 제거하여 오류 알람을 줄임으로써 정확도를 높일 수 있음을 보였다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 춘계학술대회
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• pp.369-372
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• 2021

요즘 시대에는 사람들이 학업이나 일 때문에 앉아있는 시간이 많아지고 있다. 또한 휴식 시간에도 사람들이 컴퓨터, 스마트폰, 태블릿 PC를 많이 사용하므로 자세가 더 나빠지고 있다. 장시간 동안 이러한 자세를 유지하면 목, 어깨, 척추와 관련된 근골격계에 문제가 발생한다. 또한 육체 피로와 자세 변형 등의 문제는 다양한 연령대로 확대될 것으로 추정된다. 따라서 본 연구에서 개발 중인 시스템의 핵심 기능은 본인의 자세가 올바른지 확인하고 제작된 모바일 애플리케이션을 사용하여 경고 알림을 수신하게 하는 것이다. 이를 위해 휨 센서, 압력 센서, 기울기 센서를 부착하여 활용한다. 휨 센서는 자세의 휘어짐을 감지하여 비교하여 아두이노 우노 보드로 송신한다. 또한 몸의 밸런스, 기울기 등의 정보를 취합하여 지금의 자세가 올바른지 판단한다. 자세가 올바르지 않을 때 경고하는 방법은 모바일 애플리케이션을 통하여 알림을 받으며, 사용자와 보호자의 애플리케이션에 본인의 자세가 올바르지 않는다는 것을 표시한다. 본 연구에서 제안한 시스템을 통하여서 앞으로의 자세관련 연구에 큰 도움이 될것이 기대된다.

• 한국전문물리치료학회지
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• 제4권2호
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• pp.18-35
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• 1997

The purpose of this study were to determine causes of low back pain in bus drivers who usually work in prolonged sitting position and to find the relationship of back pain with general characteristics and work environmental characteristics, stress symptoms, to com맹re lordosis angle of habitual driving posture and resting posture in low back pain group and non-low back pain group, and to use this result as a basis for improvement of work environment and comprehensive rehabilitative management of low back pain. Ninety-eight bus drivers were selected from the membership of an urban transit union in Seoul. These informations were collected from May 1, 1997 to May 25, 1997 by means of structured questionnaires and X-ray findings. These data were analyzed by $x^2$ test, t-test, logistic regression using SAS. The major results were as follows: 1. Of the respondents, 66.3% of bus drivers were found to be experiencing back pain. 2. Of the respondents of low back pain groups, 78.5% reported that major cause of low back pain was due to prolonged sitting. 3. The group with experiences of frequent or continuous vibration had more low back pain (p<0.05). There were no significant differences among other work environmental factors. 4. Average stress score was significantly higher in the group with low back pain than in the group without low back pain (p<0.05). 5. The results of the logistic regression analyses were statistically significant vibration from seat and stress score among the risk factors (p<0.05). 6. Averaged lordosis angle of habitual driving posture was $7.6{\pm}14.9$ degrees in low back pain group, $16.5{\pm}8.7$ degrees in non-low back pain and averaged lordosis angle of resting sitting posture was $10.8{\pm}13.7$ degrees in low back pain, $18.9{\pm}9.6$ degrees in non-low back pain group but the difference in mean lordosis angles of two groups was not statistically significant. The results of this study indicate that professional drivers developed chronicity of low back pain due to unfit seat, poor habitual posture and stress from vibration or other risk factors. Therefore, there is need to improve work environment, i.e. enough resting, to set a seat to support lumbar spine properly and to provide comprehensive rehabilitation program including early diagnosis, proper treatment and education for self help management.

• 대한인간공학회지
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• 제27권1호
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• pp.53-60
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• 2008

The purpose of this study is to provide basic data, such as exerting muscle power of the lower-extremity, EMG test and pressure distribution for designing ergonomic workstation in sitting posture. The exerting muscle power of the lower-extremity was measured by PRIMUS in 4 postures of 90$^{\circ}$, 120$^{\circ}$, 150$^{\circ}$ and 180$^{\circ}$. And performed ANOVA test on Max. and Mean 100%MVC. In EMG test for surveying muscle mobiligation, 5 muscles(Rectus Femoris, Vastus Lateralis, Gastrocnemius, Soleus, Tibialis Anterior) were employed. Additional experiment in pressure distribution in sitting posture by Pliance(16$\time$16 poles), Max. pressure was measured and performed ANOVA test on the results. Concludingly, sitting posture with 120$^{\circ}$ lower-extremity is the best design criterion for ergonomic workstation in sitting posture.

• 대한물리의학회지
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• 제11권3호
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• pp.41-47
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• 2016

PURPOSE: Forward head posture (FHP) is one of the most common postural problems among white-collar workers who perform highly repetitive tasks in the same position. The aim of this study was to research the effects of thoracic and lumbar support fixtures on forward head posture (FHP) during visual display terminal (VDT) work. METHODS: The subjects were 36 healthy male students with no problems in their medical history or respiratory systems. The subjects were randomly assigned to three groups: control group (n=12), thoracic support fixtures (n=12), and lumbar support fixtures (n=12). We conducted a text typing task of the same content for 20 minutes, and evaluated the angles, including the craniovertebra angle (CVA), craniorotation angle (CRA) with photogrammetry. RESULTS: The thoracic and lumbar support fixture groups showed a statistically significant difference at the CVA and CRA to the control group (p<.05), and the post-hoc test showed an increase of the CVA and decrease of the CRA than the control group. However, when we compared the effects of thoracic and lumbar support fixtures on FHP, there was no significant difference in the difference in decrease of the CVA or increase of the CRA (p>.05). CONCLUSION: We determined that VDT work using thoracic and lumbar support fixtures has a positive effect on forward head posture in white-collar workers. Further studies are required to find the more effective location of support fixtures.

• 대한기계학회논문집A
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• 제27권5호
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• pp.688-696
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• 2003

The casing oscillator used for basic construction of buildings, factories and bridges is a construction machine, which rotates and rolls the casing to insert it into the ground. It is very important that the casing is positioned perpendicular to the sea level regardless of the slope of the ground. In this paper, we present a new casing oscillator that doesn't need additional work to level the ground for the casing insertion. The kinematic analysis fur work space of a casing oscillator is presented and carried out with auto-balancing of the casing oscillator using posture feedback control.

• 산업경영시스템학회지
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• 제34권1호
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• pp.97-102
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• 2011

This study was performed to design and develop an ergonomic equipment for strawberry sorting and packing in agricultural working environments. Potential risk of work related musculo-skeletal disorders associated with farm workers performing strawberry sorting and packing was analyzed through interviews, field surveys, work measurement, and working posture evaluation. For the evaluation of working posture, we used REBA, OWAS, and RULA assessment methods to identify multi-factorial risk factors. Based on the result of comprehensive assessment, a new concept of multi-level rotating table for strawberry sorting and packing was proposed to modify awkward working postures and improve the effectiveness of the farm work. Finally, the characteristics and effectiveness of new equipment was discussed in terms of improvements in productivity, safety, and subjective ratings of farm workers. The results of analysis showed that working conditions improved significantly.

• 한국안전학회지
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• 제30권3호
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• pp.93-99
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• 2015

Economic burden of work-related musculoskeletal disorder(WMDs) is increasing. Known causes of WMDs include improper posture, repetition, load, and temperature of workplace. Among them, improper postures play an important role. A smart sensor called SensorTag is employed to estimate the trunk postures including flexion-extension, lateral bend, and the trunk rotational speeds. Measuring gravitational acceleration vector in the smart sensor along the tri-orthogonal axes offers an orientation of the object with the smart sensor attached to. The smart sensor is light in weight and has small form factor, making it an ideal wearable sensor for body posture measurement. Measured data from the smart senor is wirelessly transferred for analysis to a smartphone which has enough computing power, data storage and internet-connectivity, removing need for additional hardware for data post-processing. Based on the estimated body postures, WMDs risks can be conviently gauged by using existing WMDs risk assesment methods such as OWAS, RULA, REBA, etc.

• 대한인간공학회지
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• 제11권2호
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• pp.3-13
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• 1992

Resultant compressions on the L5/S1 joint of six subjects were studied as they lif- ted light weights in sitting and standing work postures. The subjects activities were photographed and analysed later by a static biomechamical computer model. Statistically significant differences were found between the result of the two postures analyses. Sitting posture showed significantly high compressions on the joint when doing several material handling tasks having the same work loads from the hip joint. Therefore, it is recommended that working with light weights in standing is less hazardous than doint the same work sitting postures, although both the maximum compression forces are under the Action Limit suggested by NIOSH.

• 대한인간공학회지
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• 제25권2호
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• pp.77-84
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• 2006

The objective of this study was to investigate the validity of a self-administered checklist for office ergonomics. Total 71 office workers were asked to fill up the checklist, while 3 trained ergonomists assessed the work posture of the workers. It was shown that out of 10 checklist items, there were significant differences for 8 posture-related items between the worker group and the professional group. Therefore, when a checklist is applied to office environment, the posture-related aspect should be evaluated by ergonomic professionals.