• PNF and Movement
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• 제19권1호
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• pp.31-42
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• 2021

Purpose: The purpose of this study was to investigate the effect of visual and auditory feedback combined with theraband exercise in rounded shoulder posture. Methods: There were 43 adults with rounded shoulder posture who had a distance of 2.5 cm or more from the posterolateral of the acromion to the table in the supine position that participated. The participants were randomly divided into four groups: those with visual feedback from the lateral view (visual feedback; VFB, n = 11) provided, those with auditory feedback of praise (auditory feedback; AFB, n = 10) provided, those with visual feedback and auditory feedback (visual auditory feedback; VAFB, n = 11) provided, and those without any feedback (control group; CON, n = 11). Theraband exercise with or without feedback was carried out three times per week for three weeks. To confirm the effect of theraband exercise with visual feedback and auditory feedback on pain, range of motion (ROM), posture, and psychological variables were measured before and after exercise in participants with rounded shoulder posture. Results: The VAFB group showed significant differences in pain, ROM, posture, and psychological variables when compared before and after treatment. However, the differences among the VAFB, VFB, AFB, and CON groups were significant in the ROM of abduction, the New York Posture Rating, and the scapular index. Conclusion: In conclusion, theraband exercise combined with visual feedback from the lateral view and auditory feedback by praise improved rounded shoulder posture. Moreover, auditory feedback was more significant statistically than visual feedback.

• 대한인간공학회지
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• 제26권1호
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• pp.29-37
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• 2007

This study was performed to evaluate the characteristics of transmitted vibration to hand-arm system under different work posture while operating a light-weighted powered hand grinder. For the experiment, 8 different types of wrist posture (natural, unlar-flexion, radual-flexion, flexion, extension, complex posture, and etc.) and 3 types of feed force (20[N], 50[N], 70[N]) were considered. 10 male subjects were employed to polish metal plate with a hand grinder. All of them were normal and healthy with no history and symptom of the work related musculoskeletal disorders in the dominant hand. Vibration acceleration data were recorded with sampling rate, 2048[Hz]. In addition, unweighted overall R.M.S. acceleration at the tool and wrist, and transmissibility between them were used to evaluate factors from the recorded tri-axial vibration acceleration. The results indicate that transmissibility of natural wrist posture was significantly higher than others. In addition, as the feed force becomes larger, the vibration was transmitted in large quantities to hand-arm system through radius.

• International Journal of Vascular Biomedical Engineering
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• 제3권2호
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• pp.10-16
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• 2005

Because patients with coronary artery disease (CAD) have depressed vagal modulation and the mortality risk from acute myocardial infarction is lower in patients with higher vagal modulation, methods that can increase vagal modulation are desirable in patients with CAD. We intended to inspect the effect of recumbent posture on vagal modulation. By using angiography, 33 patients with abnormal (CAD group) and 33 patients with normal coronary arteries (control group) were studied. The nonlinear as well as the linear characteristics of heart rate variability (HRV) were analyzed on these patients in three recumbent postures: namely, the supine, right lateral decubitus, and left lateral decubitus postures. The lower the normalized high-frequency power (nHF) in the supine or left lateral decubitus posture, the higher the increase in the nHF when the posture was changed from supine or left lateral decubitus to right lateral decubitus in both groups of patients. Right lateral decubitus posture can lead to the highest vagal modulation and the lowest sympathetic modulation among the three recumbent postures in both normal and patients with CAD. Therefore, the right lateral decubitus posture can be used as an effective physiologic vagal enhancer in patients with CAD.

• 한국산업융합학회 논문집
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• 제18권2호
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• pp.129-138
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• 2015

This study describe a new method to control posture and velocity for a wheeled mobile robot using visual feedback control method with a position based visual feedback. To slove the problem of vibration phenomena which were shown in the previous researches using a simple switching function based on a threshold, the proposed visual servo control law introduces the fusion function based on a blending function. The chattering problem and rapid motion of the mobile robot can be eliminated. And we consider the nonlinearity of the wheeled mobile robot unlike the previous visual servo control laws using linear control methods to improve the performances of the visual servo control law. The proposed posture control law using visual servoing is verified by a theoretical analysis and simulation and experimental results.

• 제어로봇시스템학회논문지
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• 제8권10호
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• pp.890-897
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• 2002

This paper deals with the reduction of trajectory tracking error by changing the initial postures of a biped robot. Gait of a biped robot depends on the constraints of mechanical kinematics and the initial states including the posture. Also the dynamic walking stability in a biped robot system is analyzed by zero moment point(ZMP) among the stabilization indices. Path trajectory, in which knee joint is bent forward like human's cases, is applied to most cases considered with above conditions. A new initial posture, which is similar to bird's gait, is proposed to decrease trajectory tracking error and it is verified through real experimental results.

• 한국HCI학회:학술대회논문집
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• 한국HCI학회 2009년도 학술대회
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• pp.432-435
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• 2009

본 논문은 적외선센서를 이용한 사용자의 손동작 패턴 검출에 관한 연구이다. 사람의 움직임 패턴을 파악하기 위해, 카메라를 이용하여 실시간 영상을 획득하는 방법과, 가속도센서 및 자이로스코프를 이용한 사용자의 모션검출에 관한 연구가 활발히 진행되고 있다. 하지만 이러한 기존의 연구들은 사용자의 모션을 검출하기 위해 고가의 장비와 이를 운용하기 위한 고성능의 모션처리기가 필요하다. 또한 조명이나 피부색, 센서의 정밀도에 따른 모션검출의 한계가 있다. 본 논문은 적외선센서를 이용하여 사용자의 손동작을 간편하게 검출할 수 있는 방법에 대한 연구로써, 적외선센서를 가로.세로 형태로 배치한 기구부와 이를 제어하기 위한 센서보드를 이용하여 사용자의 손동작을 검출한다. 또한 보다 정확한 손동작 검출을 위해 사용자 손동작을 패턴단위로 구분하고, 센서의 감지순서와 감지시간 차이를 이용하여 분류한 손동작 패턴을 매칭시키는 방법을 제안한다. 본 연구의 결과는 이동로봇이나 컴퓨터 어플리케이션을 직접 제어하는 것으로 그 효용성을 검증한다. 컴퓨터 어플리케이션은 웹 기반의 지도 검색 프로그램인 구글어스를 사용한다.

• 대한물리의학회지
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• 제17권1호
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• pp.63-74
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• 2022

PURPOSE: This study aimed to compare the effects of manual therapy with stabilization exercises to manual therapy alone, on neck pain and body functions in patients with chronic mechanical neck pain. METHODS: Twenty patients with chronic mechanical neck pain were recruited and randomly allocated into two groups. A control group(n = 10) was given the manual therapy alone and an experimental group(n = 10) was given the manual therapy with stabilization exercises. The intervention was carried out 3 days per week for 4 weeks. The cervical resting pain, the most painful motion pain, craniocervical flexor endurance, forward head posture and neck disability index were used to assess participants at baseline and after 4 weeks. RESULTS: A comparison of the parameters before and after the intervention showed that both groups experienced significant improvements in the resting pain, the most painful motion pain, craniocervical flexor endurance, and forward head posture except for the forward head posture in the control group. A comparison of the parameters between the groups did not show a significant difference. CONCLUSION: The results of this study suggest that the combined intervention of manual therapy with stabilization exercise does not seem to be more effective than manual therapy alone for improving neck pain, craniocervical flexor endurance, forward head posture, and the neck disability index in patients with chronic mechanical neck pain.

• Physical Therapy Rehabilitation Science
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• 제11권2호
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• pp.189-197
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• 2022

Objective: The purpose of this study was to investigate the effect of a lower trapezius strengthening exercise program on an unstable support surface on pain, neck dysfunction, psychosocial factors, and postural alignment in neck pain patients with forward head posture. Design: A randomized controlled trial Methods: A total of 36 neck pain patients participated in this study. Screening tests were performed and assigned to experimental group (n=18) and control group (n=18) using randomization program. Both groups performed the lower trapezius strengthening exercise program. In addition, in the experimental group, an exercise program for lower trapezius muscle strengthening was performed on an unstable support surface. All interventions were performed 3 times a week, for a total of 5 weeks. quadruple visual analogue scale (QVAS), neck disability index (NDI), short form (SF)-12, and postural alignment were measured before and after the intervention to compare their effectiveness. Results: Both groups showed significant differences in QVAS, NDI, SF-12, and postural alignment before and after intervention (p<0.05). In addition, the experimental group showed significant differences in NDI and postural alignment compared to the control group (p<0.05). Conclusions: The lower trapezius strengthening exercise program on unstable support surfaces is an effective intervention method with clinical significance in improving neck disability and postural alignment in patients with neck pain with forward head posture.

• 반도체디스플레이기술학회지
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• 제21권1호
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• pp.44-49
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• 2022

The number of single-person households is increasing worldwide, and among them, the proportion of elderly single-person households is increasing. In the case of elderly single-person households, a significant portion of their leisure time is devoted to watching TV. However, if they fall asleep while watching TV without turning it off, it may be difficult to sleep well due to lights and sounds of TV, which can cause health problems such as depression and reduced immunity. Therefore, in this paper, we propose a system that automatically turns off the TV when a person watching TV falls asleep. Images are collected using the camera installed in front of the TV. Since the posture of a person watching TV varies from a sitting posture to a lying posture, the system is designed to determine whether or not to fall asleep regardless of the posture. In addition, since it becomes difficult to judge eye movements as a person moves away from the TV, a method for extending the judgmentable distance is proposed. The system model was implemented and tested using a Raspberry Pi, a monitor, an infrared sensor, and a camera. Eye movements were judged regardless of sitting or lying position, and the distance between a user and a TV was extended by about 200 cm.

• 대한정형도수물리치료학회지
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• 제28권1호
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• pp.1-7
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• 2022

Purpose: The purpose of this study is to examine the unstable wall squat exercise and stable bridge exercise on posture in normal adults. Methods: The subjects of this study were 34 university students who were normal health adults, equally and randomly allocated to a unstable wall squat exercise group (male 7, female 10), an experimental group, and a stable bridge exercise group, a control group. Both did so for 30 minutes three times per week over a six-weeks period. Using Back Mapper, their trunk inclination (TIN), trunk imbalance (TIM), pelvic position (PPO), pelvic torsion (PTO), pelvic rotation (PRO) and the position of their scapula (PSA) were evaluated. Results: When the pre-test and post-test results of experimental group and control group were compared, statistically significant differences in TIN, PTO and PSA of experimental group were seen. Conclusion: Unstable wall squat exercise accompanied by abdominal drawing-in may be applied as a method to correct the posture in normal adults.