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형준호(Joon-Ho Hyeong),노종련(Jong-Ryun Roh),김사엽(Sa-Yup Kim),정경렬(Kyung-Ryul Chung) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
A backrest pivot point should be identical to the hip joint center of human body so that occupants’ unpleasant experience in a reclining chair could be prevented. As seat pan and backrest support buttock and back keeping distance from hip joint, a couple of pin-in-slot joints rather than a pin joint must be applied to the backrest in order to match the center of rotation of backrest to the hip joint center. But mechanical friction occurs on the pin-in-slot joint, which makes decreased reaction force of backrest when tilting upright consequentially, occupants feel uncomfortable. In this study, bearing, roller, and slider was suggested for the pin components, and backrest reaction force(BRF) was measured between upright to maximally reclined tilting position. Results says that the backrest reaction force(BRF) was strong applying the bearing to the pin-in-slot joint while, it was the least when applying the slider. Because there is manufacturing cost difference among three alternatives consisted of several pin types, synthetic judgment requires considering not only mechanical friction but also occupant’s feeling and appearance.
형준호(Joon-Ho Hyeong),김사엽(Sa-Yup Kim),노종련(Jong-Ryun Roh),정경렬(Kyung-Ryul Chung) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The hinge mechanism on folding bicycle is one of the most important design factors, which allows the bicycle frame to fold and to make size reduction. The hinge mechanism contains clamping mechanism which controls locking and release of frame rotation. Hinge and clamping mechanism is critical to the cycling safety and it affects usability and appearance also. But the study on the bicycle hinge mechanism has not been performed. In this study concept analysis of clamping function was carried out in order to enhance understanding of the hinge mechanism and three types of clamping mechanism were suggested. The force shifting procedure from the grasping force to the clamping force was analyzed and the amount of camping force was calculated at each types of mechanism. We expect this study contributes to the improvement of usability and appearance on folding bicycle.
형준호(Joon Ho Hyeong),김사엽(Sa Yup Kim),노종련(Jong Ryun Roh),박성빈(Seong Bin Park),정경렬(Kyung Ryul Chung) 대한기계학회 2015 大韓機械學會論文集B Vol.39 No.6
등판이 기울어지는 사무용 의자에서 등판 회전축 위치를 인체의 엉덩관절에 일치시키면 인체와 등판이 일체화되어 기울어짐으로써 사용성을 향상시킬 수 있다. 그러나 등판 힌지가 외부로 돌출되지 않도록 하기 위해 적용되는 핀인슬롯 조인트에서 기구적인 마찰이 발생해 등을 기울이고 세우는 동안 사용자에 영향을 줄 것으로 예상된다. 본 연구에서는 마찰 정도가 다른 조인트 부품으로서 슬라이더, 롤러 그리고 베어링 세 가지 유형을 적용하고, 등판 기울임 시 대비 복귀 시의 반발력 비율을 측정하였다. 실험 결과 베어링, 롤러, 슬라이더를 적용한 경우 등판 반발력 비율은[±SD]은 각각 59.7[±10.3]%, 47.2[±13.6]%, 30.3[±18.1]%로 나타나 베어링을 적용할 경우 마찰이 가장 작았다. 그러나 각 부품들은 생산단가 측면에서 차이를 보이기 때문에 부품 선정 시 마찰감소 성능뿐만 아니라 사용자의 주관적인 만족도를 함께 고려할 수 있음을 제시하였다. The location of the pivot between the backrest and seat pan of a reclining chair should be identical to the hip joint center to prevent unpleasant user experiences during tilting motion. However, mechanical friction occurs in the pin-in-slot joints that are installed under the seat pan as an alternative to the hinge joint. This reduces the reaction force between the backrest and the occupant"s back when reclining and returning to an upright position, which causes the occupant"s discomfort. In this study, bearings, rollers, and sliders were suggested as alternatives for the pin component, and the percentage of the reaction force on the backrest was measured while reclining the backrest and subsequently returning it to an upright position. The results show when bearings, rollers, and sliders were used for the pin-in-slot joint, the percentages of the reaction force were 59.7 ± 10.3, 47.2 ± 13.6, and 30.3 ± 18.1, respectively, indicating that the friction of the bearing was the lowest among the three pin components. Because the three alternatives have different manufacturing costs, synthetic judgment requires the consideration of not only mechanical friction but also user experience.
착석자세 모니터링 시스템 개발을 위한 착석자세 추정 연구
형준호(Joon-Ho Hyeong),김사엽(Sa-Yup Kim),노종련(Jong-Ryun Roh) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Posture correcting system applies to the office chair that monitoring a sitting posture and send feedback to the user at real time basis. In the previous study, pressure sensors has been equipped both on the backrest and the seat pan to estimate sitting posture from five different posture types. In this preliminary study, posture detecting experiment has performed only using seat pressure sensors for reducing product cost. A subject was seated on the seat pressure mat and asked to change posture during measurement of the load at four divided sectors. The result says that the percentage of total force on seat pan compared with body weight (%BW) is a suitable index for assessing whether the users back lean against the backrest or not. Consequently, five different major sitting postures could be detected only using seat pressure sensors. The posture measuring technique is expected to be applied to the posture monitoring chair with resonable price.
재료의 굽힘 특성을 이용한 인간공학적 사무용 의자의 단순화 설계에 관한 연구
정경렬(Kyung Ryul Chung),형준호(Joon Ho Hyeong),김사엽(Sa Yup Kim),노종련(Jong Ryun Roh) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The purpose of this study is developing an innovative office chair that equipped with simplified tilt mechanism. Recently the office chair is equipped with synchronized tilt mechanism which is characterized by the seat tilt synchronized with the backrest. It is comfortable but the mechanism is so complex that it is difficult to design and manufacturing. In this study simplified chair that has minimum number of joint because of bending properties of seat frame has designed. Tilt angle of seat and back rest, center of rotation, was analyzed using dynamic simulation. The simplified chair shows as same kinematic characteristics as the synchronized tilt mechanism. In conclusion, there is possibility of developing innovative office chair that has simplified tilt mechanism.
컴퓨터 업무에 최적화된 사무용 의자의 등판 및 좌판 굴곡 메커니즘 개발
정경렬(Kyung Ryul Chung),형준호(Joon Ho Hyeong),김사엽(Sa Yup Kim),최준호(Chun Ho Choi),박성빈(Seong Bin Park),노종련(Jong Ryun Roh) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Musculoskeletal disorders caused by long hours sitting in front of computer threats to health of modern people. Sedentary worker frequently shows a posture with the buttock slide out forward. This behavior appears in order to relieve discomfort of ischial tuberosity caused by prolonged upright sitting. A problem is the kyphotic lumbar curvature due to the absence of the lumbar support. In this study, an office chair was developed to keep the lumbar supported and to continue working at reclined posture. Backrest bending mechanism was designed in order to support upper back vertically during backrest tilting so that it will allows user watch on visual display continuously. At the same time the V-shaped seat was designed in order to prevent buttock sliding forward during reclined posture and to minimize downward movement of the whole body. As a result, the developed office chair was optimized for a prolonged VDT work. Validation of the concept with prototype chair is remained.
사무용 의자의 종류에 따른 틸팅 동작의 거동분석에 관한 연구
정경렬(Kyung Ryul Chung),형준호(Joon Ho Hyeong),김사엽(Sa Yup Kim),노종현(Jong Ryun Roh) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The purpose of this study is analyzing commercial office chair that equipped with synchronized tilt mechanism which is characterized by the seat tilt synchronously with the backrest. The kinematic analysis of human-chair system during tilt was performed using dynamic simulation software. Five commercial office chair was selected and link system of tilt mechanism was modeled. Tilting angle of seat and backrest was calculated and the trace of eye, shoulder, hip and knee were analyzed by performing tilting simulation of human-chair system. There are various tilting characteristics among commercial office chairs and it affect on the human tilt motion. Human motion and comfort is priority requirements when designing office chair. And the tilt mechanism can be designed to support the aimed human motion.
정경렬(Kyung Ryul Chung),형준호(Joon Ho Hyeong),김사엽(Sa Yup Kim),노종련(Jong Ryun Roh),최준호(ChunHo Choi),박성빈(Seong Bin Park) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Prolonged sitting posture can cause unnatural lumbar curvature and high disc pressure consequently sitting is responsible for musculorskeletal discomfort. Ergonomic recline chairs are commonly used in order to reduce user’s disc pressure and improve sitting comfort. Especially synchronized tilt mechanism featured linked seat and back angles are mainly used. In this study existing synchronized tilt mechanism was classified into several types based on the combination of parts and joints. The purpose of this study was to analyze the human recline motions that are affected by changes in tilt mechanism. Chair and human seating system was modeled based on eight of existing office chairs and recline simulation was performed. To observe recline movement markers were set at the shoulder, hip, knee and ankle joints of body and at the front and rear seat. Four types of kinematic characteristic were observed containing stay, forward, backward and upward motion at the front seat. Hip and knee motions were revealed significant correspondence to the seat motion. The influence of characteristic of knee and hip motions on the sitting comfort and musculorskeletal health is remained further study.