• Tunnel and Underground Space
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• v.23 no.6
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• pp.521-537
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• 2013

While microseismicity induced by hydraulic stimulation carried out for EGS is useful means in estimating the range of permeability increase, it also affect surface structures and environments. In order to establish a mitigation plan for microseismicity triggered by hydraulic stimulation, we reviewed world-wide guidelines on the impact of ground vibration on the surface structure and human environment by blasting. Case studies from Europe and USA on the microseismicity by hydraulic stimulation are presented and suggestions are made for the guidelines on ground vibration by hydraulic stimulation for the ongoing Pohang EGS project.

• Journal of the Korea Convergence Society
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• v.11 no.9
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• pp.31-37
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• 2020

The purpose of this study was to investigate the Effect of transcranial direct current stimulation convergence task-oriented training combined with vibration stimulation on hand dexterity and upper limb function in stroke patients. One time 30 minutes 5 times a week for 4 weeks. experimental group of transcranial direct current stimulation convergence task-oriented training combined with vibration stimulation and control group of the task-oriented training combined with vibration stimulation were divided into 10 members. Hand dexterity and upper limb recovery were measured. The experimental group and the control group showed significant improvement in hand dexterity and grasping(p<.05), grasping, and gross movement(p<.05). The experimental group showed a significant improvement in hand dexterity and grasp and grip than the control group. Effect size showed more than small effect in all evaluation items. Based on the results of this study, it is considered that more effective and efficient rehabilitation treatment can be performed in the clinic.

• Therapeutic Science for Rehabilitation
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• v.4 no.2
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• pp.63-71
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• 2015

Objective : The purpose of this study was to investigate the effects of vibratory stimulation applied to the left forearm on unilateral neglect in patients with stroke. Methods : The subjects were 11 unilateral neglect patients with stroke. They were divided into 2 groups; 6 experimental subjects and 5 control subjects. Both groups received standardized rehabilitation program and occupational therapy for the intervention of unilateral neglect in a day. In random order, line bisection test (LBT), Albert test, and star cancellation test (SCT) were conducted at baseline, the next day. During the process of all assessments of the next day, vibration stimulation was provided for the 6 subjects in the experimental group (EG), while the 5 subjects in CG carried out all assessments without vibration stimulation. Result : No significant differences were found between groups on any demographic variable or baseline assessments scores. In the next day, there was significant improvement in the EG for the LBT(p<0.05), Albert's test(p<0.05), and SCT(p<0.05). However, there was no significant improvement in the CG for the LBT(p<0.05), Albert's test(p<0.05), and SCT(p<0.05). Conclusion : These result indicate that vibratory stimulation has a positive effect on the unilateral neglect, and may be considered as alternative choice in clinical occupational therapy for reducing unilateral neglect.

• Physical Therapy Korea
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• v.26 no.1
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• pp.19-27
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• 2019

Background: Compared to healthy people, patients with chronic lower back pain have reduced balance abilities which may cause proprioception problems, patients with chronic lower back pain avoid physical activities due to pain, and reduced activity levels lead to muscle weakening, which can further exacerbate pain. Recently, there have been many studies on the use of sensory stimulation; and among these studies, interventions that use vibrational stimulation have shown functional improvements in the patients. Objects: This study examined the effects of a stabilization exercise with vibration stimulation on the balance ability and disability in patients with chronic back pain. Methods: The subjects of the study were 30 persons who were randomly assigned to the experimental group and the control group, with 15 subjects in each. The subjects were evaluated before and after intervention via a balance ability test, the Korean Oswestry disability index (KODI) test, a pain test, and a proprioceptive sensory test. Both groups received general physical therapy. The experimental group performed the stabilization exercise with vibration stimulation, and the control group performed a general stabilization exercise, three times a week for six weeks. Results: After the intervention, both groups showed significant improvements in the balance ability test, the KODI test, the pain test, and the proprioceptive sensory test. The experimental group showed statistically significant, higher improvements than the control group in the balance ability test, the KODI test, and the proprioceptive sensory test. Conclusions: The stabilization exercise with vibration stimulation for patients with chronic back pain has been reported to provide greater functional improvements than the conventional intervention method. Therefore, the stabilization exercise in a vibration stimulation environment could be a useful intervention for patients with chronic back pain.

• Journal of The Korean Society of Integrative Medicine
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• v.7 no.3
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• pp.117-125
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• 2019

Purpose : The purpose of this study was to determine the effects of simultaneous application of focal vibration stimulation and task-oriented training on the improvement in upper extremity motor function after stroke. Methods : The study period was from January to April 2019; 23 patients who fulfilled the study eligibility criteria were enrolled. The participants were divided into two groups: the experimental group with vibration stimulation and task-oriented training and the control group with only task-oriented training. Training was conducted in a total of 20 sessions, 5 times a week for 30 minutes a day for 4 weeks. The amount of use of the affected and unaffected side by accelerometers, and Box and Block test (BBT), Action Research Arm Test (ARAT) was measured with a pre-test, a post-test. Wilcoxon Signed Rank Test and Analysis of Covariance were used to compare and analyze the changes within and between the groups. Results : Both the groups showed statistically significant changes in the results of the BBT and the ARAT, as well as the amount of use of the affected and unaffected side. Regarding the use of the affected side, BBT results, and the grasp and gross movement item of the ARAT showed significant changes in the experimental group compared with the control group. Conclusion : We found that simultaneous application of focal vibration stimulation and task-oriented training was more effective than task-oriented training alone. A large-scale comparative study involving a group that is only given vibration stimulation should be conducted for more generalizable results.

• The Journal of Korean Physical Therapy
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• v.34 no.5
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• pp.193-197
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• 2022

Purpose: The purpose of this pilot study was to assess the feasibility of a proposed study "To investigate the effects of applying a vibration stimulation to the paretic and non-paretic sides on balance and gait in stroke patients" before proceeding with the main study. Methods: A total of 30 patients who had suffered a stroke and who met the selection criteria participated in this study. However, only 14 patients completed the study. The study subjects were randomly assigned to vibration stimulation on either both sides (B group) or the paralyzed side (P group). The interventions were applied for six weeks. The patients were assessed using the Berg balance scale (BBS), Timed up and go (TUG), 10-meter walk (10 MW), and 6-minute walk (6 MW) tests. Results: There was a significant difference before and after the application of vibration stimulation in the BBS, TUG, 10MW, and 6 MW tests in the B group (p<0.05). Similarly, there was also a significant difference observed in the 10 MW and 6 MW tests in the P group (p<0.05). The difference between the two groups was not significant in the BBS, TUG, 10 MW, and 6 MW tests (p>0.05). Conclusion: This pilot study suggests that it would be feasible to conduct a large-scale randomized controlled trial (RCT) to examine the effects of applying a vibration stimulation to the paretic and non-paretic sides, on the balance and gait in stroke patients.

• Journal of Digital Convergence
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• v.18 no.11
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• pp.303-309
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• 2020

This study was aimed to investigate the effects of neck extensor vibration stimulation on neglect and balance of stroke patients. Patients diagnosed with stroke were selected according to select the study target, 10 patients with experimental group with traditional occupational therapy and neck extensor vibration, and 10 patients with control group with traditional occupational therapy and neglect therapy for 30 minutes per each session 5 times a week for total 8 weeks. As a result of the study, comparison of two groups after the intervention showed that the experimental group had a more significant on the neglect and balance than the control group(p<.05). These result demonstrate that neck extensor vibration stimulation for the effective of neglect and balance in stroke patients, therefore is expected to be useful in rehabilitative therapy.

• Ocean Systems Engineering
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• v.7 no.1
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• pp.39-51
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• 2017

Fishes detect various sensory stimuli, which may be used to direct their behavior. Especially, the visual and water flow detection information are critical for locating prey, predators, and school formation. In this study, we examined the specific role of these two different type of stimulation (vision and vibration) during the obstacle avoidance behavior of carp, Cyprinus carpio. When a visual obstacle was presented, the carp efficiently turned and swam away in the opposite direction. In contrast, vibration stimulation of the left or right side with a vibrator did not induce strong turning behavior. The vibrator only regulated the direction of turning when presented in combination with the visual obstacle. Our results provide first evidence on the innate capacity that dynamically coordinates visual and vibration signals in fish and give insights on the novel modulation method of fish behavior without training.

• Journal of the Korean Society for Precision Engineering
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• v.29 no.5
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• pp.578-583
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• 2012

The pharmacological therapies and whole body vibration as non-pharmacological therapies were known to have adverse side effects. Therefore, partial stimulation was suggested and its effects were evaluated. This study aimed to evaluate the site-specific effects of partial stimulator for treatment of osteoporosis induced by estrogen deficiency. Sixteen virginal Sprague-Dawley rats (12 weeks old) were divided into 2 groups(no stimulation, stimulation groups). All rats were ovariectomised to induce osteoporosis. After 3 weeks of operation, the right tibiae in rats of stimulation group (frequency: 10Hz, cycle: 1500, strain on bone surface: $2000{\mu}{\varepsilon}$) were stimulated perpendicularly at right tibia by using partial stimulator for 6 weeks (3days/week). The right tibiae in rats were scanned, before stimulation (0 week) and at 6 weeks after stimulation by using in-vivo micro computed tomography. For investigation of changes in morphological characteristics, structural parameters were measured and calculated. At 6 weeks the morphological characteristics (relative value) in stimulation group were significantly enhanced than those in no stimulation group (p<0.05). In this study, we find that after 6 weeks of partial stimulation, the morphological characteristics of tibia trabecular bone were enhanced. Thus, we concluded that partial stimulation could be used to treat osteoporosis.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.7
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• pp.3109-3116
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• 2011

We studied the effects of vibration stimulation method on upper limbs spasticity in patients with brain lesion. 21 patients with spasticity of the upper limbs selected and divided randomly 3 groups. And then vibratory stimulation was applied to the triceps brachii muscle in group I(n=7), to biceps brachii muscle in group II (n=7), and to both muscles in group III (n=7). Using Neuro-EMG_Micro to investigate the changes in spinal neuronal excitability, F-waves were measured at before and directly after stimulation, and 10 minutes later and 20 minutes later after stimulation especially. MAS(Modified Ashworth Scale) test for muscle tone and MFT(Manual Function Test) for the upper extremity motor function were performed before stimulation and 20 minutes later after stimulation for the purpose of clinical evaluation. In our study, MAS was significant decreased in all groups, F wave and F/M ratio parameters were decreased in all groups and more decreased specially in group III. MFT was increased in group II and III, and more increased specially in group III. Vibration stimulation reduced the neuronal excitability of spinal cord and also muscle tone, and improved the motor function of the upper extremity. These results suggested that vibration stimulation giving to both muscles(triceps and biceps brachii muscle) at the same time was more efficiency in reducing the neuronal excitability of spinal cord and improving the motor function of the upper limbs.