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다중센싱 진동 인터페이스: 웨어러블 기기의 UX에 미치는 영향을 중심으로
정상윤(Sangyoon Jeong),임영재(Youngjae Im),박성준(Sungjoon Park),정의승(Eui S. Jung) 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.6
Objective: Based on the two points threshold of vibration stimulation, this paper determines the vibration stimulation type and design variables of the Multi-sensing Vibration Interface. and performs the verification of whether it is compatible with the actual cognitive direction when directional information is provided to the wrist using Multi-sensing wearable device designed on the basis of these results. Background: Most of the dangerous situations around us are accompanied by noise. However, pedestrians who are unable to use their hearing, such as hearing-impaired and distracted pedestrians, are unable to recognize latent danger with being exposed to major accidents. Therefore, there is a need for an intuitive and effective way to provide the direction of hazardous situations accompanied by noise to those who cannot use hearing. Method: This paper consists of two experiments. In the first experiment, through the two-point threshold experiment of the vibration stimulation, the efficient arrangement of vibration stimulation of the multi-sensing wearable device and the type of providing the vibration stimulation were derived. In the second experiment, when direction information was provided to the user"s wrist through the Multi-sensing Vibration Interface, it was investigated whether there is a difference in direction recognition according to the user"s posture and the vibration providing method. The experimental apparatus produced a bracelet-type wearable experimental device using Arduino UNO and 3D printer output, and conducted the experiment. As the dependent variables, the error rate as a quantitative index and the preference (7-point scale) as a qualitative index were collected. Results: In the first experiment, the displacement and time interval between vibration stimuli functioned as main factors that influence two points threshold. The results of the second experiment showed a significant difference between the error rate and preference, depending on the user"s Posture and type of vibration stimulation, but there were no differences in gender, age or group of subjects. Conclusion: It has been confirmed that users can recognize the direction information of risk factors provided through the multi-sensing wearable interface in compatibility with the actual direction. Application: The results of this study are expected to be the basis for determining the design variables of the multi-sensing vibration interface and developing wearable devices that direct the direction.
비스듬히 던진 물체의 공기저항을 고려한 재귀 최소 자승법 기반 실시간 포물선 운동 궤적 추정
정상윤(Sangyoon Jeong),좌동경(Dongkyoung Chwa) 대한전기학회 2018 전기학회논문지 Vol.67 No.3
This paper uses a recursive least squares method to estimate the projectile motion trajectory of an object in real time. The equations of motion of the object are obtained considering the air resistance which occurs in the actual experiment environment. Because these equations consider air resistance, parameter estimation of nonlinear terms is required. However, nonlinear recursive least squares estimation is not suitable for estimating trajectory of projectile in that it requires a lot of computation time. Therefore, parameter estimation for real-time trajectory prediction is performed by recursive least square estimation after using Taylor series expansion to approximate nonlinear terms to polynomials. The proposed method is verified through experiments by using VICON Bonita motion capture system which can get three dimensional coordinates of projectile. The results indicate that proposed method is more accurate than linear Kalman filter method based on the equations of motion of projectile that does not consider air resistance.
주행 시험 데이터를 이용한 저가형 차량시뮬레이터의 조향감 재현 장치 구현
이창호(Changho Lee),정상윤(Sangyoon Jeong),김성수(Sung-Soo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A haptic steering system which reflects steering reaction torque has been developed for a fixed base vehicle simulator. The haptic steering system consists of a steering effort sensor, MR-clutch, AC servo motor and controller. In order to generate realistic steering torque feel to driver, 3D torque map is constructed by experimental data and torque generation algorithm using the torque map has been also developed. 3D torque map is constructed using curve fitting and interpolation technique of the measured values of the steering angle, velocity and steering torque from actual slalom test on the proving ground. For curve fitting and interpolation method, model based calibration tool box in Matlab program is utilized. In order to carry out performance test of the developed haptic steering system, fixed based vehicle simulator is constructed by integrating real time vehicle dynamics module, VR-video/audio module, and the haptic steering system. Steering torque and steering angle curves have been obtained from virtual testing in the vehicle simulator and performance of the haptic steering system has been evaluated.