• 한국터널지하공간학회 논문집
• /
• 제11권3호
• /
• pp.303-314
• /
• 2009

암석 절리면의 거칠기의 발현에 따른 돌출부의 손상 특성을 연구하기 위해 전단시험 한 절리면 시편에 대한 이미지 분석을 수행하였다. 동일한 절리면에 대한 반복적인 시험에는 복제 시편을 사용한 모델시험이 가장 적합하였으므로 암석절리면으로부터 각기 다른 4종류의 3차원 거칠기를 복제하고, 고강도 석고를 사용한 시편을 제작하였다. 연직응력 수준을 변화시키며 총 20여회의 전단시험을 실시하였으며, 전단된 시편의 디지털 사진의 이미지 분석을 통하여 손상된 거칠기의 국지적 양상과 규모를 분석하였다. 분석 결과 거칠기의 손상 특성은 연직응력의 수준에 크게 의존하며, 돌출부의 파괴와 마모로 규정할 수 있는 것으로 나타났다. 돌출부 손상은 첨두 전단변위에서 가장 많이 발생하며, 변위가 증가하면 작은 돌출부들이 새롭게 손상되어 평균적인 돌출부의 손상 규모는 일정한 것으로 나타났다. 고강도 석고를 사용한 전단시험 결과에 자연 암석절리의 돌출부를 구성하는 광물입자의 물리적 특성이 완전하게 반영될 수는 없다. 그러나 첨두 전단변위와 돌출부 손상과의 상관관계에 대한 정량적 연구 결과는 돌출부 손상 특성의 파악이 암석 절리면 역학적 특성과 전단모델의 연구에 매우 중요한 수단이 될 수 있음을 보여준다.

• The Journal of Korean Physical Therapy
• /
• 제14권4호
• /
• pp.475-486
• /
• 2002

Orthopaedic manual therapy(OMT) includes knowledge in arthokinematic, biological, behavioral, biomechanical, patholology, anatomy, and clinical science. it allows proper approach to patient evaluation and program development and relieves joint and soft tissue lesions. The OMT has sports injurys, traumatic, developmental, and neuromusculoskeletal disorders of acute and chronic states, and prevention of dysfunction as well as the development, improvement, restoration, or maintenance of joint and muscular mobility, stability, relaxation, strenth, endurance, balance, and functional skills. The purpose of this article has to define and clarify the change and development of basic concepts of orthopaedic manual therapy. OMT is ancient in origin. The book of ' Manipulation Past and Present ' contains pictures recording various types of joint mobilization by Hippocrates. Recently, there are many kinds of manual therapeutic maneuvers to assess and relieve joint and soft tissue lesions developed by James Cyriax, John McM Mennell, Brian R Mullign, Robin McKenzie, Freddy Kaltenborn, Geoffrey Maitland, and Ola Grimsby.

• 대한물리의학회지
• /
• 제3권3호
• /
• pp.151-160
• /
• 2008

Purpose : The purpose of this study is to know the muscle activation after sub-talar joint mobilition and active exercise, and the low leg muscle activity through the well-balanced interaction of ankle joint around muscle. Methods : For this study 61 experimental subjects are divided into 24 people of supination foot group, pronation foot group 17 people of, 20 people of control group through navicular drop test. Surface EMG was used in order to measure the muscle activities. following is the result of the data analysis about each experiment that has been carried on a week, 2 weeks, 3 weeks, 4 weeks before, and even comparing with pre-experimental state. Results : In electromyogram study, the higher muscle activation there was before the experiment, the more muscle activation increase there was after the experiment in Tibialis Anterior, Peroneus Longus, Peroneus Brevis.(p<.05). Conclusion : This study shows the balanced activation of foot and ankle-around muscle. It shows that foot shape affects the balanced activation recovery of lower leg muscles.

• 대한물리의학회지
• /
• 제9권4호
• /
• pp.439-445
• /
• 2014

PURPOSE: This study was to investigate the effect of direction of gliding in the tibiofibular (TF) joint on angle of active ankle dorsiflexion (AADF). METHODS: Fifteen subjects with no medical history of lower extremities were recruited in this study. The digital dynamometer was used to maintain the same gliding force in each condition. The angle of AADF was measured by using the electronic goniometer. Subjects were instructed to perform the AADF in three trials during the each gliding in the TF joint by the examiner. The conditions were no gliding and four directions of gliding in the proximal (anterior-superior: A-S vs posterior-inferior: P-I) and distal (posterior-superior: P-S vs. anterior-inferior: A-I) TF joint. A repeated measured ANOVA was used to compare angle of the AADF in each TF joint. The paired-sample t tests with Bonferroni correction were used in order to Post hoc pair-wise comparisons. The significant level was set at 0.016 (0.05/3). RESULTS: In distal TF joint, the angle of AADF in the A-I direction of gliding was significantly lower than those in no gliding and P-S direction of gliding (p<0.01). In proximal TF joint, the angle of AADF was significantly lower than those in no gliding and A-S direction of gliding (p<0.01). Although there was no significant differences, angle of AADF were largest in the P-S direction of gliding among four conditions. CONCLUSION: These findings suggest that gliding technique of TF joint would be required to improve the angle of AADF in subjects with limitation of ankle dorsiflexion.

• 대한정형도수물리치료학회지
• /
• 제28권3호
• /
• pp.51-59
• /
• 2022

Background: This study aimed to investigate the effect of mobilization with movement (MWM) applied to the ankle joint, on the craniovertebral angle (CVA), pressure pain threshold, and neck disability index (NDI) in asymptomatic adults with a forward head posture (FHP). Methods: A total of 32 subjects with FHP were assigned to either the MWM group (N=16) or the cranio-cervical flexion exercise (CCFE) group (n=16). The CVA, pressure pain threshold and NDI were measured before and 4 weeks after the intervention. Results: A significant improvement in the CVA was observed in the MWM group (p<.05), whereas no significant changes (p>.05) were observed in the CCFE group. Both groups showed significant differences in the pressure pain threshold and NDI before and after the intervention (p<.05). Conclusion: The results of the study suggest that MWM applied to the ankle joint can effectively improve the CVA, pressure pain threshold, and NDI of adults with a forward head posture. Based on this study, the ankle MWM technique for dorsiflexion can be used as an objective research method for additional studies targeting FHP patients in the future.

• 대한물리의학회지
• /
• 제4권3호
• /
• pp.149-156
• /
• 2009

Purpose：The hamstring muscle has an important role in standing, walking and other functions related to daily living. Most people with Cerebral Palsy(CP) have muscle tightness, especially in the hamstring, which may cause abnormal alignment in the lower extremities. To investigate an effective treatment for hamstring muscle tightness by observing the effects of heat pack or Soft tissue mobilization(STM) on hamstring muscles. Methods：Thirteen-two volunteers with CP aged between 9 and 13 years($M\pmSD$: $11\pm1.46$), were recruited and divided into four groups of four: (1) the STM for people with Spastic CP group, (2) the heat pack(HP) for people with Spastic CP group, (3) the STM for people with Mixd CP group, and (4) the heat pack for people with Mixed CP group. All received treatment three times per week for six weeks. A inclinometer was used to measure for hip flexion & knee extension joint range motion(ROM). Results：The ROM of hip flexion & knee extension were improved at the STM and HP for people with Spastic CP groups. The ROM and hip flexion were improved at the STM and HP for people with Mixed CP groups. The amount of increase ROM are differenced by the types of CP. Conculusion：STM and heat pack, both are effective for people with CP especially for Spastic CP.

• The Journal of Korean Physical Therapy
• /
• 제12권1호
• /
• pp.153-161
• /
• 2000

Adaptive lengthening or shortening of the nervous system is essential in order for a part of the body to move without restriction or resistance. Up until now, most treatment concepts have focused on normalizing muscle tone and preventing contractures in muscles and joint, but, as Butler and Gifford have brought to the attention of therapists, when a part of the body moves, nerves are required to move as well, so that the integration of nervous system mobilization in treatment is equally important. As the main function of the nervous system is impulse conduction, it is obvious therefore that adaptive lengthening, both centrally and peripherally, is essential in order to accommodate the enormous variety and extent of body movements and postures used in everyday life impeding news conduction. In present day manual therapy, most physical therapist mobilize the nervous system inadvertently. Probably what may make it more difficult is that, for most physical therapist it is a relatively new tissue to contemplate, at least in biomechanical terms, and basic knowledge of structure is generally less than if joints and muscles. The purpose of this study was to introduce the nervous system mobilization to a physical therapist who is primary a clinician and who has concerned in the areas of biomechanics and pathology looking far answers to the clinical Problems.

• 대한정형도수물리치료학회지
• /
• 제8권1호
• /
• pp.25-30
• /
• 2002

The main purpose of this article is to suggest a modified SNAGs manual method in based of Mulligan techniques. And this study aimed to resolve the back pain which has combined movement dysfunction in lumbar spine, in addition to upgrade of manual therapy technique in clinical field. The results of this study were as following; 1. The first introduction of SNAGs in Korea is the 'International Mulligan Concepts and Techniques Seminar' by Prof. Russell M. Woodman(Quinnipiac college, USA), 1998. SNAGs is defined a mobilization with movement manual therapy that facet joints of the lesion mobilized to anterior-superior direction according to the treatment plane in apophyseal joint of hypomobility. 2. A treatment mechanism of the SNAGs is, Mulligan say, HIVD which is the result of posterior disk bulging from a increased between intervertebral pressure due to hypo-mobile of facet joints in abnormal spine, so therapist should be necessary mobilization of zygophyseal joints especially in disk lesion. 3. Because Mulligan does not yet mentioned SNAGs techniques about a back pain with combined movements dysfunction, so we suggest a modified SNAGs method for manual therapy of back pain patients due to combined movement dysfunction at lumbar.

• 대한조선학회논문집
• /
• 제44권5호
• /
• pp.482-487
• /
• 2007

The container mobilization of material resources has increased continually owing to international economy growth and overseas trade increase in recent years. There are large amounts of order received for container carriers which are the biggest in the world ranging from 8,000 TEU to 10,000 TEU or above The very large container carriers have minimum thickness of sheer strake, upper deck and hatch coaming about $65mm{\sim}90mm$. Therefore, this study is performed in order to develop vertical welding process with high deposition rates applicable to thick plate above 65mm thickness. Electrogas welding process with 1 pole and 2 poles has been developed to apply to vertical joint with thick plates in the shipyard. In this paper, it was explained that the relationship of cross section to various groove types and executed that electrogas welding for thick plates. The mechanical tests were carried out to verify the soundness and effectiveness of EGW.

• Steel and Composite Structures
• /
• 제42권2호
• /
• pp.161-172
• /
• 2022

In this paper, four specimens of CFST column joints with endplates and long bolts are tested in the scenario of progressive collapse. Flush endplate and extended endplate are both adopted in this study. The experimental results show that increasing the thickness of the endplate could improve the behavior of the joint, but delay the mobilization of catenary action. The thickness of the endplate should not be relatively thick in comparison to the diameter of the bolts, otherwise catenary action would not be mobilized or work effectively. Effective bending deformation of the endplate could help the formation and development of catenary action in the joints. The performance of flexural action in the joint would affect the formation of catenary action in the joint. Extra middle-row bolts set at the endplates and structural components set below the bottom beam flange should be used to enhance the robustness of joints. A special weld access hole between beam and endplate should be adopted to mitigate the chain damage potential of welds. It is suggested that the structural components of joints should be independent of each other to enhance the robustness of joints. Based on the component method, a formula calculating the stiffness coefficient of preloaded long bolts was proposed whose results matched well with the experimental results.