• The Journal of Korean society of community based occupational therapy
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• v.7 no.1
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• pp.17-24
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• 2017

Objective : The purpose of this study was to estimate the reliability of cervical range of motion measurement in healthy adults using smart phone application and goniometer that can be easily applicated in clinical setting. Methods : The cervical range of motion was measured as the flexion, extension, right rotation, left rotation, right lateral flexion, and left lateral flexion. To measure the reliability of intra-rater and inter-rater reliability, the same examiner performed two measurements and the other examiner performed once, total measurement were performed three times. The order of tests was randomized and two examiners didn't know the results of measurements. Results : Thirty healthy adults were participated. The result of this study shows that there were are no significant differences in all movements except the right lateral flexion in comparison of average angle of smart phone application and goniometer. The intra-rater reliability of smart phone application and goniometer showed ICC as .841~.958 and the inter-rater reliability showed ICC as .720~.944 for all movements. Conclusion : These results suggest that smart phone application and goniometer have proven to be reliable in measuring the cervical range of motion. Smart phone application can be used as a useful tool in clinical setting due to fast and accurate measurements of cervical range of motion.

• Journal of Biomedical Engineering Research
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• v.36 no.5
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• pp.228-234
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• 2015

The balance ability significantly decreased in the elderly because of deterioration of the neural musculature regulatory mechanisms. Several studies have investigated methods of improving balance ability using real-time systems, but it is limited by the expensive test equipment and specialized resources. Recently, Kinect system based on depth data has been applied to address these limitations. Little information about accuracy/inaccuracy of Kinect system is, however, available, particular in motion analysis for evaluation of effectiveness in rehabilitation training. Therefore, the aim of the current study was to evaluate accuracy/inaccuracy of Kinect system in specific rotational movement for balance rehabilitation training. Six healthy male adults with no musculoskeletal disorder were selected to participate in the experiment. Movements of the participants were induced by controlling the base plane of the balance training equipment in directions of AP (anterior-posterior), ML (medial-lateral), right and left diagonal direction. The dynamic motions of the subjects were measured using two Kinect depth sensor systems and a three-dimensional motion capture system with eight infrared cameras for comparative evaluation. The results of the error rate for hip and knee joint alteration of Kinect system comparison with infrared camera based motion capture system occurred smaller values in the ML direction (Hip joint: 10.9~57.3%, Knee joint: 26.0~74.8%). Therefore, the accuracy of Kinect system for measuring balance rehabilitation traning could improve by using adapted algorithm which is based on hip joint movement in medial-lateral direction.

• Journal of Korean Neurosurgical Society
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• v.45 no.3
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• pp.169-175
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• 2009

Objective : The goal of this study was to evaluate the biomechanical features of human cadaveric spines implanted with the Activ L prosthesis. Methods : Five cadaveric human lumbosacral spines (L2-S2) were tested for different motion modes, i.e. extension and flexion, right and left lateral bending and rotation. Baseline measurements of the range of motion (ROM), disc pressure (DP), and facet strain (FS) were performed in six modes of motion by applying loads up to 8 Nm, with a loading rate of 0.3 Nm/second. A constant 400 N axial follower preload was applied throughout the loading. After the Activ L was implanted at the L4-L5 disc space, measurements were repeated in the same manner. Results : The Activ L arthroplasty showed statistically significant decrease of ROM during rotation, increase of ROM during flexion and lateral bending at the operative segment and increase of ROM at the inferior segment during flexion. The DP of the superior disc of the operative site was comparable to those of intact spine and the DP of the inferior disc decreased in all motion modes, but these were not statistically significant. For FS, statistically significant decrease was detected at the operative facet during flexion and at the inferior facet during rotation. Conclusion : In vitro physiologic preload setting, the Activ L arthroplasty showed less restoration of ROM at the operative and adjacent levels as compared with intact spine. However, results of this study revealed that there are several possible theoretical useful results to reduce the incidence of adjacent segment disease.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.27 no.2
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• pp.17-25
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• 2021

Background: The purpose of this study is to investigate basic data about the effects of muscle energy technique on the shoulder complex range of motion and posture alignment in the round shoulder posture. Methods: The subjects included 15 women that gave consent to participate in the study voluntarily. They performed the muscle energy technique for 30 minutes twice. The round shoulder posture was measured with a straight edge ruler. The shoulder complex range of motion was measured with the apley scratch test. The forward head posture was measured with ImageJ. The pectoralis minor muscle length was measured with a tape measure. Results: There were statistically significant differences in the round shoulder posture both right and left (p<.05). The experiment group showed statistically significant differences in the pectoralis minor muscle length (p<.05). There were significant differences in the shoulder complex range of motion including flexion, left lateral flexion, right lateral flexion, left side bending, and right side bending (p<.05), but no significant differences were found in extension (p>.05). The forward head posture showed significant differences in CVA changes (p<.05) and no significant differences in CRA changes (p>.05). Conclusion: These findings demonstrate that the muscle energy technique relaxed muscles around the shoulders and increased the shoulder complex range of motion. The technique is also expected to prevent pain in the neck and shoulders and lower injury risk. In conclusion, the muscle energy technique can be applied as an effective intervention for round shoulder posture.

• Journal of The Korean Society of Integrative Medicine
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• v.12 no.2
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• pp.33-45
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• 2024

Purpose : This study aimed to compare the effects of spinal manipulation combined with medication on low back pain (LBP), range of motion, and disability in patients with chronic LBP. Methods : Twenty patients with chronic LBP were included in this study. The participants were randomly assigned to the spinal manipulation with medication group (n=10) or the medication only group (n=10). The intervention group received spinal manipulation for 15 minutes, twice a week, and took medication twice a day for eight weeks. The control group received the medication twice daily for eight weeks. Pain intensity assessed using the visual analog scale (VAS), range of motion, and disability due to LBP assessed using the Oswestry disability index were measured before and after the intervention. Results : The intervention group showed a significant improvement in pain intensity compared to the control group (p<.05), and the intervention and control groups significantly improved low back pain after the intervention (p<.05). The intervention group showed a significant improvement in the range of motion in flexion, extension, right lateral flexion, left lateral flexion, and right rotation (p<.05). The intervention group also showed a significant improvement in the change of disability in total score, pain intensity, personal care, lifting and standing compared to the control group (p<.05). Conclusion : This study showed that the combination of spinal manipulation and medication can benefit patients with chronic LBP, as evidenced by significant improvements in pain intensity, ROM, and disability. These findings suggest that utilizing both spinal manipulation and medication can positively affect individuals with chronic LBP. The results of this study should be applied in clinical settings to optimize treatment outcomes in patients with chronic LBP.

• Journal of Ocean Engineering and Technology
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• v.27 no.6
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• pp.56-64
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• 2013

Crabbing motion is the pure sway motion of a ship without surge velocity. Thus, it can be applied to a berthing operation. Crabbing motion is induced by a peculiar operation method called the push-pull mode. The push-pull mode is induced by using a combination of the main propeller and side thruster. Two propellers generating the same amounts of thrust and rotating in opposite directions produce some yawing moment on a vessel but do not induce longitudinal motion. With the additional operation of side thrusters, the push-pull mode is used to induce a large amount of lateral force. In this paper, three-degree-of-freedom equations of motion such as for the surge, sway, and yaw are constructed for the crabbing motion. Based on these equations of motion, a feedback linearization control method is applied to auto-berthing control for a twin-screw ship with side thrusters. The controller can deal with the nonlinearity of a system, which is present in the berthing maneuver of a twin screw ship. A simulation of the auto-berthing of a ship is performed to validate the performance of the designed controller.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.1
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• pp.17-23
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• 2013

In a subway vehicle, a lateral damper is used for compensating the lateral stiffness deterioration due to the air-spring as a secondary suspension. This lateral damper can reduce the lateral vibration of the carbody. When the damping force of the lateral damper is lowered, the running stability and ride quality of the subway vehicles worsens and the lateral motion of the carbody is increased. In this study, the lateral displacement variation of the carbody according to the damping force of the lateral damper was analyzed by multi-body dynamics to solve the abnormal impact problem during vehicle operation. Furthermore, the noise and vibration due to abnormal impact were considered. An adequate damping coefficient of the lateral damper for the subway vehicle treated in this paper was suggested for preventing abnormal impact.

• Structural Engineering and Mechanics
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• v.80 no.5
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• pp.491-501
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• 2021

A difference in subgrade settlement between two rails of a track manifests as lateral differential subgrade settlement. This settlement causes unsteadiness in the motion of trains passing through the corresponding area. To illustrate the effect of lateral differential subgrade settlement on the dynamic response of a vehicle-track coupling system, a three-dimensional vehicle-track-subgrade coupling model was formulated by combining the vehicle-track dynamics theory and the finite element method. The wheel/rail force, car body acceleration, and derailment factor are chosen as evaluation indices of the system dynamic response. The effects of the amplitude and wavelength of lateral differential subgrade settlement as well as the driving speed of the vehicle are analyzed. The study reveals the following: The dynamic responses of the vehicle-track system generally increase linearly with the driving speed when the train passes through a lateral subgrade settlement area. The wheel/rail force acting on a rail with a large settlement exceeds that on a rail with a small settlement. The dynamic responses of the vehicle-track system increase with the amplitude of the lateral differential subgrade settlement. For a 250-km/h train speed, the proposed maximum amplitude for a lateral differential settlement with a wavelength of 20 m is 10 mm. The dynamic responses of the vehicle-track system decrease with an increase in the wavelength of the lateral differential subgrade settlement. To achieve a good operation quality of a train at a 250-km/h driving speed, the wavelength of a lateral differential subgrade settlement with an amplitude of 20 mm should not be less than 15 m. Monitoring lateral differential settlements should be given more emphasis in routine high-speed railway maintenance and repairs.

• Journal of Haehwa Medicine
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• v.25 no.1
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• pp.1-13
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• 2016

Objectives : Lateral epicondylitis on elbow is one of the most common causes of elbow pain. Lateral epicondylitis can be managed with acupuncture, but the evidence for its effectiveness is uncertain. The purpose of this review is to investigate the trends of acupuncture treatments on lateral epicondylitis. Methods : We investigated the studies about acupuncture treatments for lateral epicondylitis via searching 5 Korean web databases(KTKP, RISS, OASIS, KCI, Kisti) The key search terms were 'Lateral epicondylitis', 'Tennis elbow', 'External epicondylitis'. 12 research papers(10 case reports, 1 RCT, 1NRCT) were found to be analyzed according to their published year, the titles of journals, published institution, the types of study, the number of cases, the types of treatments, the instruments for assessment and ethical approvals. The effectiveness of acupuncture treatment was classified. Results : 12 papers were published since 2003. The studies on acupuncture treatments about lateral epicondylitis were mainly published in The journal of pharmacopuncture. 10 case reports, 1 non-randomized controlled trials, 1 randomized controlled trials had been under research. In most of the research, the number of the cases were not enough. In 9 cases of the studies, various korean medicine treatments including acupuncture were used to treat the symptoms. In 3 cases of the studies single method was used to treat the symptoms. Visual analogue scale(VAS) and range of motion(ROM), grip strength were used as primary assessments. Among 12 clinical studies, 1 of them were accepted by institutional review board(IRB). Conclusions : In this study, we analyzed the trends of acupuncture treatments on lateral epicondylitis. Reviewing the domestic trends of studies on acupuncture treatments for lateral epicondylitis and examining the strong and weak points of those treatments are essential for the future studies.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.04a
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• pp.73-78
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• 2013

In this paper, the vibration for a pickup actuator is described by mathematically analyzing its suspension configuration and motion, confined to lateral and torsional directions of suspensions. In order to prove the accuracy of this result, it is compared to a finite element analysis. Also it is shown that modal frequencies can be modified by changing design parameters in mathematical motion expressions.