• 한국콘텐츠학회논문지
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• 제19권10호
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• pp.198-205
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• 2019

본 연구의 목적은 목 디스크 환자에게 기계적 자극을 적용하여 피부 감각의 변화를 유도하고 동일한 척수분절의 통증 역치와 근 긴장도 전-후 변화를 확인하고자 하였다. 이에 목 디스크 질환을 가지고 있는 남성 10명, 여성 20명으로 구성된 대상자를 총 30명 선정하고 실험을 진행하였다. 기계적 자극 그룹은 Graston 장비를 이용하여 5분간 피부 감각 변화를 유도하였고, 대조군은 아무런 조치를 받지 않았다. 피부 감각 변화는 Von Frey filament를 통해 검사를 진행하였고, 압통 역치의 변화는 압통 역치 측정기를 통해 측정하였고, 근 긴장도의 변화는 Myotone pro를 사용하여 측정하였다. 기계적 자극 적용 시 피부 감각의 역치는 통계적으로 유의하게 증가하였다(p<0.05). 동일한 척수 분절의 신경 지배를 받는 오른쪽 가시아래근의 압통 역치와 근 긴장도는 통계적으로 유의하게 증가하였고(p<0.05), 오른쪽 등세모근의 압통 역치는 통계적으로 유의하게 감소하였다(p<0.05). 하지만 다른 근육들의 압통 역치와 근 긴장도는 통계적으로 유의한 변화가 나타나지 않았다. 또한, 대조군에서는 피부 감각, 압통 역치, 근 긴장도의 변화가 통계적으로 유의하게 나타나지 않았다. 결과적으로 기계적 자극에 의해 유도된 피부 감각 변화는 동일 척수 분절의 압통 역치와 근 긴장도의 변화시켰다. 따라서 동일 척수 분절에 대한 기계적 자극의 적용을 통해 목 디스크 환자의 압통 역치, 근 긴장도의 증가와 통증 조절을 위한 새로운 재활 방법으로 임상적 의의가 있다고 판단된다.

• 대한기계학회논문집A
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• 제39권4호
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• pp.375-382
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• 2015

이음새 없는 용기의 돔(Dome) 및 넥크(Neck) 부분 성형을 위해 일반적으로 열간 스피닝 공정이 이용되나, 대부분 현장 작업자들의 경험이나 시행착오에 의해 제작되고 있다. 이로 인하여 열간 스피닝 공정 시, 용기 넥크 부위의 저부부터 상부까지 내경이 동일한 성형을 요구하지만, 고속회전하는 롤러의 이동에 의하여 재료가 성형되는 스피닝 공정의 특성상, 돔 부분의 끝단부인 넥크 부위에서 내경이 벌어지는 형상오차의 문제가 발생한다. 이에 본 연구에서는 스피닝 가공 후, 탭핑 공정을 위하여 이종재료(Cr-13)가 보충된 나사산 모델에 대하여 이론적 해석 및 유한 요소 해석을 수행한 후, 해석결과를 토대로 작동환경하에서 용기의 구조안전성을 검증하였다.

• 한국안전학회지
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• 제34권2호
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• pp.22-27
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• 2019

Bikers can be subjected to accidents during their bicycling. Helmets are only good, if any, for their head protection. A wearable airbag can protect the human neck area if it is properly designed. This airbag system is composed of an inflater and an airbag. The inflater contains a pressurized gas cylinder and a piercing device. The airbag is an inflatable fabric surrounding the human neck. When a bicycle accident happens, a sensor captures the motion of the biker and a microcomputer sends a signal to open a valve in the inflator to supply the pressurized gas to the airbag. An important issue of this system is that the airbag should be quickly inflated to protect the human neck. This paper deals with the airbag inflation time simulation and some issues to design a wearable airbag system. Also, a prototype was tested to show its feasibility using a human dummy mounted on a running cart.

• 한국자동차공학회논문집
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• 제21권3호
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• pp.66-73
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• 2013

This study assesses neck injury of occupants in a real traffic accident case that a preceding vehicle moved backward and impacted a parked vehicle at a low velocity. This case is different from a case of whiplash injury caused by rear impact on vehicle. The impact velocity was estimated from damages of the two vehicle bumpers and the displacement of the parked vehicle was also estimated from CCTV images. MADYMO simulation was performed based on the vehicle specifications and investigation report. The comparison of neck flexion moments with the corresponding injury criteria revealed that occupants of the parked vehicle might have hardly neck injury.

• Journal of Acupuncture Research
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• 제25권4호
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• pp.191-196
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• 2008

Objective : The purpose of this study is to report the effect of T-shaped acupotomy for patients with Neck pain. Methods : We treated 16 patients who have Neck pain with T-shaped acupotomy. Results : It was effective to 14 patients among the 16 patients. Conclusions : This study demonstrate that T-shaped acupotomy useful effect on Neck pain. As though we had not wide expience in this treatment, more research is needed.

• 한국전문물리치료학회지
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• 제19권3호
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• pp.51-60
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• 2012

This study aimed to determine the usefulness of classifying patients with neck pain on the basis of the results of passive scapular elevation test. We classified 21 patients with neck pain into positive (n=12) and negative (n=9) groups on the basis of passive scapular elevation test; the 2 groups then equally performed scapular stabilization exercise program for 30 min, 3 times a week, for 4 weeks. Visual analogue scale (VAS), neck disability index (NDI), and range of motion (ROM) were recorded both before and after the intervention for both groups. Paired t-test was used to determine that there were significant changes between before and after the intervention, and independent t-test was used for analyzing changes between two groups of dependent variables. After 4 weeks of training, we observed significant decrease in pain and disability (p<.05) and a significant increase in rotation, flexion, extension, and side-bending ROM (p<.05) in both groups. Further, between pre- and post-intervention evaluations, we observed a significant decrease in pain and disability and a significant increase in rotation and flexion ROM in the positive group than in the negative group (p<.05). These results indicate that passive scapular elevation test may be used to identify mechanical disorders of the cervicoscapular muscle in patients with neck pain. Therefore, we recommend the use of passive scapular elevation test to determine appropriate treatment intervention when treating patients with neck pain.

• Fibers and Polymers
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• 제2권1호
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• pp.140-143
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• 2001

To better understand the formation of necking in drawing processes of fibers, strain distributions during drawing processes have been analyzed. For simplicity, one-dimensional incompressible steady flow at a constant temperature was assumed and quasi-static model was used. To describe mechanical properties of solid polymers, non-linear visco-plastic material properties were assumed using the power law type hardening and rate-sensitive equation. The effects of various parameters on the neck formation were matematically analyzed. As material property parameters, strain-hardening parameter, visco-elastic coefficient and strain-rate sensitivity were considered and, for process parameters, the drawing ratio and the process length were considered. It was found that rate-insensitive materials do not reach a steady flow state and the rate-sensitivity plays a key role to have a steady flow. Also, the neck formation is mainly affected by material properties, especially for the quasi-static model. If the process length changes, the strain distribution was found to be proportionally re-distributed along the process line by the factor of the total length change.

• 대한통합의학회지
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• 제9권4호
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• pp.271-281
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• 2021

Purpose : This study aimed to apply muscle relaxation exercise and ultrasound therapy as an effective treatment method for tension headache patients by comparatively analyzing the muscle mechanical properties, neck disorder index, and headache impact test. Method : The subjects were classified into three groups based on the intervention received: the therapeutic ultrasound (n=15, group I), placebo therapeutic ultrasound combined with the suboccipital release (n=15, group II), and therapeutic ultrasound combined with suboccipital release (n=15, group III) groups. The intragroup and intergroup differences in muscle mechanical properties, neck disability index, and headache impact test were compared and analyzed. Result : The comparison and analyses of the changes in muscle tone and post hoc analysis revealed statistically significant intragroup decreases in the suboccipitalis and upper trapezius in groups I and III. Furthermore, statistically significant intergroup differences in the upper trapezius with a greater change in group III than in group II and suboccipitalis with greater changes in group III than in groups I and II were observed. The comparison and analyses of the changes in muscle stiffness and post hoc analysis revealed statistically significant intragroup decreases in the upper trapezius in group I and suboccipitalis in group III. Moreover, statistically significant intergroup differences in both muscles with greater changes in group III than in group II for both cases were observed. The comparison and analyses of the changes in the neck disability index and post hoc analysis revealed statistically significant intragroup decreases in all three groups and statistically significant intergroup differences with greater changes in group III than in groups I and II. The comparison and analyses of the changes in the headache impact test and post hoc analysis revealed statistically significant intragroup decreases in all three groups and a statistically significant intergroup difference with greater changes in group III than in groups I and II. Conclusion : The therapeutic ultrasound and suboccipital muscle release exercise effectively increased the flexibility of the muscles around the cervical vertebrae and reduced muscle tension and stiffness in tension-type headache patients.

• BMB Reports
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• 제53권2호
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• pp.74-81
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• 2020

Under physiological and pathological conditions, mechanical forces generated from cells themselves or transmitted from extracellular matrix (ECM) through focal adhesions (FAs) and adherens junctions (AJs) are known to play a significant role in regulating various cell behaviors. Substantial progresses have been made in the field of mechanobiology towards novel methods to understand how cells are able to sense and adapt to these mechanical forces over the years. To address these issues, this review will discuss recent advancements of traction force microscopy (TFM), intracellular force microscopy (IFM), and monolayer stress microscopy (MSM) to measure multiple aspects of cellular forces exerted by cells at cell-ECM and cell-cell junctional intracellular interfaces. We will also highlight how these methods can elucidate the roles of mechanical forces at interfaces of cell-cell/cell-ECM in regulating various cellular functions.

• 한국공작기계학회논문집
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• 제12권1호
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• pp.58-64
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• 2003

A mechanical press joining was investigated in ender for joining A1-5052 sheets for automobile body weight reduction. Static tensile and fatigue tests were conducted using tensile-shear specimens for evaluation of fatigue strength of the joint. During Tox joining process for A1-5052 plates, using the current sheet thickness and punch diameter, the optimal applied punching force was found to be 32 kN under the current joining condition. For the static tensile-shear experiment results, the fracture mode is classified into interface fracture mode, in which the neck area fractured due to influence of neck thickness, and pull-out fracture mode due to influence of plastic deformation of the joining area. And, during fatigue tests for the A1-5052 tensile shear specimens, interface failure mode occurred in the region of low cycle. The fatigue endurance limit approached to 6 percents of the maximum applied load, considering fatigue lifetime of $2.5\times10^6$ cycles.