• 한국기계가공학회지
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• 제7권3호
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• pp.41-46
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• 2008

Generally optical components are fabricated by grinding, lapping and polishing processes. Those processes take long time to obtain optical high surface quality. In the case of large optical components, the on-machine measurement is strongly recommended because the workpiece is fragile and difficult to set up for fabricating and measuring. This paper is concerned about a swing-arm mechanism which can be used for on-machine measurement of a surface profile with a sensing probe end-effect, and also for grinding or lapping the surface with a corresponding tool. The measuring accuracy and uncertainty using a swing arm type profilometer have been studied. The experimental results show that this method is useful specially in lapping process with the accuracy of $5{\mu}m$. Those inspection data are provided for correcting the residual figuring error in next processes.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.813-819
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• 2006

The state of the art for the design of swing ann actuators for optical disc drives is to obtain the high efficient dynamic characteristics, especially for the small size for the mobile information devices, It is affected by the need of consumers who wants the portable digital storage devices maintaining highly functional and removable characteristics of the optical disk drive (ODD). As a necessary consequence, the need of the small form factor (SFF) storage device has been considered as an important part in the information storage technology. In this paper. we suggest a new conceptual miniaturized swing arm type actuator that has high efficient dynamic characteristics as well as satisfies the sensitivity and the heat emission requirements for the SFF-ODD. It also uses a tracking electromagnetic (EM) circuit for a focusing motion. Due to the size constraint, the thermal problem of optical head arises; therefore, we design an efficiently heat emitted structure for the actuator.

• 한국산학기술학회논문지
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• 제14권1호
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• pp.344-350
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• 2013

본 연구의 목적은 파킨슨병 환자의 청각 신호에 따른 보행 시, 상지 스윙의 비대칭과 진폭에 미치는 영향을 알아보기 위함이다. 연구의 대상자는 초기 파킨슨병으로 진단받은 14명의 환자로, 청각 신호(빠른 속도, 일반적인 속도, 느린 속도)를 무작위 순서로 제공하여 보행을 실시하였다. 청각 신호 속도는 전자 메트로놈을 이용하여 대상자의 자연스러운 보행 속도보다 ${\pm}20%$ 속도를 적용하였다. 각각의 속도에 따른 청각 신호를 적용한 보행을 실시하는 동안, 동작분석기를 사용하여 보행 시 상지 스윙의 운동학적 변수를 비교 분석하였다. 정상 속도의 보행 시 파킨슨병 환자의 양측 상지 스윙 진폭의 비교에서는 더 많은 영향을 받은 쪽(MAS)의 상지 스윙 진폭에서 유의한 감소가 나타났다(p<.05). 청각 신호 속도에 따른 보행 시의 비교에서는 빠른 속도의 청각 신호를 적용한 보행 시 상지 스윙의 유의한 증가가 나타났다(p<.05). 본 연구의 결과를 통해 파킨슨 환자의 보행 시 양측 상지 스윙의 비대칭을 확인할 수 있었으며 또한 보행 시 빠른 청각 신호를 적용하는 경우, 파킨슨병 환자의 상지 스윙을 증가시켜 자연스러운 보행양상을 유도할 수 있으므로 중재 시 필요에 따라 적절한 속도의 청각 신호를 적용하여 보행훈련에 적용할 수 있을 것으로 생각된다.

• 한국운동역학회지
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• 제16권3호
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• pp.53-63
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• 2006

The general objective of this study was to investigate biomechanical characteristics of bowling swing using three-dimensional cinematography. This study focused specifically on movements of the upper body segments during a bowling swing. Eight elite female bowling players participated in this study. Subjects performed bowling swing and their performance was sampled at 60 frame/sec using two high-speed video cameras with a synchronizer. After digitizing images from two cameras, the two-dimensional coordinates were used to produce three-dimensional coordinates of the 12 body segments (20 joint reference makers). The obtained three-dimensional coordinates were fed to a custom-written kinematic and kinetic analyses program (LabView 6.1, National Instrument, Austin, TX, USA). The analyses determined the linear and angular kinematic variables of the body segments with which joint force and torque of the lower and upper trunks and the shoulder were estimated based on the Newton-Euler equations. It was found that during the bowling swing the peak linear velocities of the body segments were reached in sequence the trunk, the shoulder, the elbow, the wrist, and the bowl. This result indicates that linear momentum of the lower body and the trunk transmits to the arm segment during the bowling swing. The joint torques of the torso and the arm occurred almost simultaneously, indicating that bowling swing seem to be a push-like motion, rather than a proximal-distal sequence motion in which many of throwing motions are categorized. The ultimate objective of the bowling swing is to release a heavy-weight bowl with power and consistency. Therefore, the bowling swing observed in this study well agrees with that bowlers use the stepping to increase the linear velocity of the bowl, the simple pendulum system and the push-like segmental motion in the torso and the arm segment to enhance the power at the release of the bowl.

• 한국전기전자재료학회논문지
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• 제21권11호
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• pp.963-967
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• 2008

There are many factors to affect polishing performance normally in chemical mechanical polishing (CMP) process. One of the factors is a pad profile. A pad profile has not been considered as a significant factor. However, a pad profile is easily changed by conditioning process in CMP, and then changed pad profile affects polishing performance. Therefore, understanding how the pad profile is changed by conditioning process is very important. In this paper, through the simulation based on kinematic analysis, the variation of the pad profile was described in accordance with difference condition of conditioning process. A swing-arm type conditioner was applied in this simulation. A swing-arm type conditioner plays a role of generating asperities on pad surface. The conditions of conditioing process to get uniform removal were also investigated by comparing the simulation with the experiment.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 추계학술대회논문집
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• pp.70-74
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• 2004

There are many researches being in process to develop the information storage devices applying to the portable devices recently. Based on this need, the information storage devices have to be satisfied with the fast access time, the robustness of the system, high data transfer rate and lower media price. The total size of the drive must design to adapt the portable devices such as CF II card or PC II card size. This paper proposes the swing arm type actuator to insert the designed actuator in the drive of the CF II size. Hereafter the research will be going on to be suitable to the physical standard and design the focus magnetic circuit newly. The swing arm type actuator including this circuit is designed to have the dynamic characteristic satisfying the mechanical specification as well as the BD 1x. Finally, the adaptability to the portable devices was demonstrated by the finite element analysis and optimization of structural part.

• 한국ITS학회 논문지
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• 제19권6호
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• pp.88-95
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• 2020

본 논문에서는 고령 보행자의 안전한 보행을 위한 새로운 팔 스윙 보행 패턴 기반 보행안전 시스템을 제안한다. 제안한 시스템은 스마트 밴드, 스마트 워치 등 햅틱 기반의 디바이스를 활용한 고령 보행자용 보행 안전 시스템으로 기존의 하지 운동의 보행 패턴으로 보행자의 낙상 상황을 인지하기 어려운 문제점을 해결하기 위해 팔 스윙 기반의 보행 패턴을 활용한다. 팔 스윙 기반 보행 패턴은 디바이스의 가속도 센서를 이용한 팔의 스윙을 통해 걸음수 및 보행자의 낙상 상황을 인지하며 낙상 상황이 발생하는 위치를 데이터베이스화하여 고령 보행자에게 낙상 발생 예상 위치 근처를 보행할 시 경고 메시지를 전달하여 고령자에게 보행 안전을 제공한다. 이러한 시스템을 통해 고령자의 안전한 보행 권리 및 환경 개선할 수 있을 것으로 기대한다.

• Journal of Mechanical Science and Technology
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• 제19권8호
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• pp.1576-1581
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• 2005

Generally, the optical components are fabricated by grinding, lapping, and polishing. And, those processes take long time to obtain such a high surface quality. Therefore, in the case of large optical component, the on-machine inspection (OMI) is essential. Because, the work piece is fragile and difficult to set up for fabricating and measuring. This paper is concerned about a swing-arm method for measuring surface profile of large optical concave mirror. The measuring accuracy and uncertainty for suggested method are studied. The experimental results show that this method is useful specially in lapping process with the accuracy of $3\~5\;{\mu}m$. Those inspection data are provided for correcting the residual figuring error in lapping or polishing processes.

• 한국운동역학회지
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• 제13권2호
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• pp.13-28
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• 2003

The purpose of this study was to analyze the kinematic characteristics of Ice hockey slap shot. The subjects of this study were four professional ice hockey players. The reflective markers were attached on the anatomical boundary line of body and the subjects were asked to perform the shot. Ariel Performance Analysis System was used to capture and digitize the shooting image, the data were analyzed by LabView 6i. The results were as fellows. 1. The period of the back swing phase was $0.542{\pm}0.062sec$, the down swing phase was $0.28{\pm}0.056sec$ and the total swing time was $0.825{\pm}0.017sec$ 2. The maximum linear velocity of the stick blade for x direction was shown after 7% of impact, for y, z direction were shown before 2%, 8% of Impact. 3. The maximum velocity of each segment for the left arm was $2.35{\pm}0.05m/s$ in the upper arm, $3.56{\pm}0.34m/s$ in the forearm, $4.75{\pm}0.67m/s$ in the hand. 4. The maximum velocity of each segment for the right arm was $4.67{\pm}0.43m/s$ in the upper arm, $7.22{\pm}0.69m/s$ in the forearm, $9.42{\pm}0.89m/s$ in the hand. 5. The angle of left elbow was generally flexed from the ready stance to the impact and was $82.26{\pm}3.45^{\circ}$ the moment of Impact. 6. The angle of the left shoulder was increased ut the down swing phase and was $78.74{\pm}4.78^{\circ}$ on the moment of impact. 7. The angle of the right shoulder was decreased in the down swing phase and increased before the impact. and the angle was $51.28{\pm}3.54^{\circ}$ on the moment of impact.

• 한국운동역학회지
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• 제16권4호
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• pp.153-164
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• 2006

This thesis is focused on kinematical and kinematical analysis of each types(Type #1 : use both swing of arm and reaction of knee, Type #2 : Use only swing of arm, not reaction of knee, type #3 : Neither use of swing of arm nor reaction of knee) of vertical jumps according to gender of High School Students. The subjects of this study is High School Student's male and female, 5 each, for analyzation of actions 3D image analyzing and GRF machines were used. To identify the differences of analyzed variables, an independent T-test on gender, an One-way ANOVA on types were used. Summery of the results are stated below. first of all, female students showed differences on Hip Joint angle and Joint Velocity from male students on Kimentic Variable. So training on hip joint force of flection and extension of female students is needed. Both male and female students showed relatively bigger result of arm's Angular Momentum than thigh's Angular Momentum on Type #1. This is regarded of faster Joint Velocity of Arm. Bigger result of female students of arm's contribution on Type #1 than male students can be said as Female student's weaker hip joint's angular muscle force than male student's, so the dependency of arm is heavier than male students. In Kinetic variable, GRF showed bigger result on male students than female students. So female students need to enhance joint's torque to increase GRF than male students. On vertical Impulse, high numeric data of last two reaction of tiptoe of vertical GRF and antero-posterior GRF helped increasing impulse by extending action time of force.