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형준호(Joonho Hyeong),노종련(Jongryun Roh),김사엽(Sayup Kim) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.10
의자의 등판 기울임 반력은 착석자의 체중에 따라 조절이 필요하다. 기존의 스프링 강도 조절장치는 스프링 초기 압력을 증가시키는 원리를 사용하여 조작에 힘이 많이 들고 불편하였다. 본 연구에서는 조작 에너지가 필요하지 않도록 스프링 작동거리를 변화시키는 원리의 새로운 스프링 강도 조절 메커니즘을 제안하였다. 기구학적 시뮬레이션을 수행하고 스프링 작동거리에 영향을 주는 설계변수를 분석하였다. 아울러 스프링 작동거리와 착석자 체중의 수용 관계를 분석하여 한국인 체형의 수용 범위를 고려한 작동거리를 계산하였다. 본 연구에서 새롭게 제시한 스프링 강도 조절장치는 의자뿐만 아니라 반력조절이 필요한 다양한 물리적 사용자 인터페이스에 적용될 수 있을 것으로 기대된다. The recline tension is supposed to change according to the occupant`s body weight. Existing spring tension adjusting devices require considerable control force, which can make the user uncomfortable. This study suggests a new type of spring tension adjusting mechanism that does not require any control effort. A changing mechanism of the spring compression stroke is adapted. Kinematic simulation is performed to analyze the design parameters that influence the compression stroke. Moreover, the range of body weight considering the Korean population from the point of view of the compression stroke is investigated. The suggested mechanism is applicable to other physical user interfaces that are need of changing the interacting force.
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.
보행의 디딤비율을 접목한 직립주행 자전거용 크랭크 구동시스템 거동분석
형준호(Joonho Hyeong),노종련(Jongryun Roh),김사엽(Sayup Kim) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Stand-up cycling leads to fatigue on the lower limbs because whole body weight is loaded on the leg at the stance phase. Especially changing the stance phase from one leg to the other side is involves increased knee joint moment. In this study, the feature of gait pattern characterized by extended stance phase which occupies 60% of gait cycle is applied to the design of crank drive system in order to decrease lower limb fatigue. An eccentric crank axis deviated from the chaining axis is adopted to realize slow motion at stance phase and quick return at swing phase. Design parameters of eccentric crank mechanism are defined, and kinematic simulations are performed to understand the behavior of the mechanism. The simulation results say that the increased eccentric distance (A) lead to increase the deviation angle (θ) which means stance phase occupies more time of the entire cycle. This study may contribute to develop a stand up bicycle having more portability.
클리키 스위치 조작 시 피드백의 명확성을 정량화 하기 위한 햅틱프로파일 분석
형준호(Joonho Hyeong),김사엽(Sayup Kim),노종련(Jongryun Rho),이재환(Jaehwan Lee) 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.1
Objective: This study aims at investigating the physical factors associated with feedback clarity when operating a clicky switch by analyzing haptic profile. Background: The operating feeling has become more important in PUI. Previously, many studies on the effect of physical parameters of controller on the affective experience have been conducted. The preferred physical parameters such as peak force, stroke and friction has been revealed already in many studies. But there are few quantitative studies on the feeling of feedback clarity which plays an important role in improving the operating feeling. The clarity is a haptic feedback to notify the user if the controller was operated successfully. To investigate the appropriate level of clarity and to improve operating feeling, the quantitative indicators that associated with the perceived clarity needed to be revealed. Method: The reaction force and stroke are measured when a clicky switch was pressed in a constant and voluntary speed. The constant operation was conducted by linear actuator and the voluntary operations were conducted by five human subjects. Each subject was operated 20 times and haptic profile which consists of the force and the stroke was measured. Based on haptic profile, change rate of the force and stroke was further analyzed to extract the acceleration and the rate of force. Results: The reaction force and stroke changed drastically at a time when passing through click section and the acceleration and the rate of force were increased prominently and instantly at that moment. The acceleration can be suggested for physical factor that associated with feedback clarity because the acceleration directly activates a mechanoreceptor called Pacinian corpuscles in human skin. Conclusion: It is understood that the increased peak acceleration associated with the feeling of clarity. The further empirical studies on the preferred acceleration and level of clarity are needed in application area. Application: The results contribute to the design of haptic feedback on the PUI.
형준호(Joonho Hyeong),노종련(Jongryun Roh),김사엽(Sayup Kim) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.11
사무용 의자는 착석자의 자세 변화에도 지속적으로 척추를 지지해 주는 것이 필요하다. 본 연구에서는 등판 기울임 시 요추전만과 흉추후만 이라는 자세변화를 능동적으로 지지하는 의자의 등판 굴곡메커니즘을 개발하였다. 연속적으로 배열된 다관절 링크의 동기화된 회전을 가능하게 하는 기본 원리를 파악하여 굴곡메커니즘 개념을 제시하였다. 제시된 개념안에 대해 동역학 해석을 통해 관절간의 회전량과 힘 전달특성을 분석하였다. 최종적으로 기어드 힌지(geared hinge) 타입의 메커니즘을 적용하여 등판 굴곡메커니즘을 설계하고 시작품을 제작하였다. 동작분석장비를 활용하여 등판 기울임 시 굴곡량을 측정하여 설계안을 검증하였다. 본 연구에서 제시한 연속적 굴곡메커니즘은 인체의 자세변화에 대응하여 능동적으로 지지해 주는 인체지지 제품 개발에 활용될 수 있을 것으로 기대된다. The human spine requires continuous support even though a postural changes have occurred in office chairs. This study develops a flexion mechanism for backrests to actively support lumbar lordosis and thoracic kyphosis during back reclines. The basic mechanism for the synchronous rotation of continuously joined linkages is investigated, and three types of flexion mechanism are proposed. Kinetic simulations are performed to analyze the rotation angle and the force on each pivot joint. A flexion mechanism that uses a geared hinge type is adopted, and a prototype chair is manufactured. The designed flexion angle was validated using a three-dimensional (3D) motion analysis system when reclining the backrest. The proposed continuous flexion mechanism is expected to be widely applicable to human support systems, resulting in body postural changes.