• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.28 no.3
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• pp.1-7
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• 2022

Background: Manual traction with a belt is a physiotherapy treatment method that reduces disk pressure and widens the disk space. In clinical settings, it is applied to numerous patients with herniated intervertebral disk (HIVD). This study aimed to identify the effects of manual traction with a belt on the intervertebral space in patients with lumbar HIVDs. Methods: The intervention was performed on 17 patients with lumbar HIVDs who were divided into two groups: one with eight patients having HIVD at L4~L5 and another group with nine patients having HIVD at L5~S1. The participants received manual traction with a belt twice a week for 12 weeks, and radiographic imaging was used to visualize the intervertebral space and compare it before and after treatment. Results: Manual traction with a belt increased the lumbar intervertebral space at L4~L5 and L5~S1 in patients with L4~L5 HIVD. A significant difference was observed in the L4-L5 distance (p<.01); however, no significant difference was observed in the L5~S1 distance (p>.05). The intervertebral space significantly increased at both L4~L5 and L5~S1 in patients with L5~S1 HIVD (p<.05). Conclusion: Thus, manual traction with a belt increased the intervertebral space in patients with L4~L5 and L5~S1 HIVDs. These results are expected to guide studies on manual traction with belts in clinical settings in the future. Further studies using the present research as an objective study method are anticipated.

• Journal of Advanced Marine Engineering and Technology
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• v.30 no.8
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• pp.863-869
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• 2006

A new CVT, the inner spherical traction CVT (ISCVT) is introduced. Transmission of the most scooters is the self-controlled variable pulley-belt type of CVT having some disadvantages in the fuel consumption and the limitation of the transmittable power due to the slippage between the belt and pulley. Unlike this, ISCVT controlled directly by driver is more efficient and the contact mechanism having the same line of contact normal of the spherical rotors of different radii on common center causes that the power density and torque capacity are remarkably improved. The prototype with the specifications of 50cc scooter is designed and tested.

• Transactions of the Korean Society of Automotive Engineers
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• v.6 no.6
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• pp.226-233
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• 1998

In this paper, an experimental study was performed to investigate the speed ratio-torque-thrust characteristics for metal belt CVT. It is observed from the experimental results that nondimensional secondary thrust force follows with the existing theoretical formula with ${\mu}$=0.09~0.12 depending on the torque and the speed ratio. In order to represent these characteristics, an effective friction coefficient was introduced. Also, the slip characteristics between the belt and the pulley were investigated experimentally and traction coefficients at gross slip were obtained for various speed ratios. Using the traction coefficients and the effective friction coefficients, an improved formula for the secondary thrust force was suggested assuming that thrust force is the summation of the thrust of pseudo inactive arc and the thrust of pseudo active arc. The effective friction coefficient and the improved formula for the speed ratio-torque-thrust relationship suggested in this work can be used to obtain the appropriate secondary thrust.

• Transactions of the Korean Society of Mechanical Engineers
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• v.11 no.5
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• pp.772-780
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• 1987

The normal and tangential belt forces for two types of flat belts are measured and compared. From friction theory, ti was assumed that tangential friction is proportional to the actual contact area $A_{a}$ and $A_{a}$ is proportional to normal pressure P; i.e., $A_{a}$ .var.P$^{n}$ . For a flat belt with cloth backing, the n=2/3 is obtained for the constant of belt surface model. For a flat belt with rubber backing, the n=0.9 to n=1.0 is suggested as a surface model constant. The theoretical equation developed in this paper showed agood with the experimental results.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.20 no.1
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• pp.35-38
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• 2014

Background: The case study examined the effect of a hip joint traction and hip posterolateral muscles strengthening on knee pain, range of motion, and lower extremity function scale of patients with patellofemoral pain syndrome (PFPS). Although PFPS has previously been attributed to quadriceps dysfunction, more recent research has linked this condition to impairment of the hip musculature and kinematic. Methods: Subject is a 27-years-old female with PFPS. Performed hip joint traction with belt and posterolateral muscles(hip abductors, external rotators) strengthening for 4 weeks, 3 times a week, once a day. Before and after the therapy, measurements were made on the visual analog scale (VAS) and of the ROM, and a lower extremity functional scale (LEFS) was conducted. Results: The results showed positive changes in VAS and range of motion and lower extremity functional scale. First VAS of knee changed from 6 to 2. Second hip joint range of motion showed that internal rotation recored from $53^{\circ}$ to $58^{\circ}$ and external rotation recorded from $32^{\circ}$ to $37^{\circ}$. Third The lower extremity functional scale showed before therapy of 44; after therapy, 63. Conclusion: The hip joint traction and hip posterolateral muscles strengthening was effective in alleviating knee pain, increasing ROM and Lower extremity functional scale of the PFPS patients.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 1993.10a
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• pp.1196-1201
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• 1993

Test of Caterpillar Challenger 65 tractor which has rubber tracks, and articulated four wheel drive tractor with dual wheels and a mechanical front wheel drive tractor were conducted on an unplowed and plouwed wheat stubble field. The following parameters were analyzed : tractive efficiency (ηv), net tractive coefficient ($\phi$n), slip ($\sigma$) , drawbar pull(Fv), drawbar power (Pv) and forward velocity(v). The maximum net tractive coefficient was established at the tractive efficiency of 0.60 on the unplowed wheat stubble field : for the Challenger 65 tractor 0.855 ; 4WD 0.624 and MFWD 0.534 and on the plowed wheat stubble field with the tractive efficiency of 0.40 for the Challenger 65 tractor 0.82 : 4WD 0.57 and for tractor MFWD 0.48.

• Clinics in Shoulder and Elbow
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• v.11 no.1
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• pp.66-69
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• 2008

Traumatic forequarter amputation is an extremely rare and life-threatening injury. It is caused by blunt trauma or tremendous traction force, and the prognosis is very poor because of the involvement of massive associated injury. Traumatic forequarter amputation has been rarely reported in the English language clinical literature, but has never been reported in Korea. We report a case of traumatic forequarter amputation caused by a conveyor belt that was treated with emergency resuscitation and surgery, with an accompanying review of the literature.

• Transactions of the Korean Society of Automotive Engineers
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• v.19 no.5
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• pp.125-133
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• 2011

The wear of rubber track being in contact with the road surface is an important subject because it decreases the traction performance and the operating efficiency of tracked vehicle. For the above reasons, many attempts have been made to quantitatively calculate the rubber track. However, it depends on the experimental methods which are highly time- and cost-consuming. Therefore, the numerical simulation approach is highly desirable, but it needs to model the complex geometry and the material behavior in details as well as the interaction with the road surface. In this study, the rubber track and its material behavior are elaborately modeled since these factors are very important in the prediction of the wear rate of the rubber track. Accordingly to the studies on the rubber wear by previous investigations, it has been found that the wear is greatly influenced by the frictional energy. The frictional energy of rubber track is computed by utilizing the 3D finite element analysis of the rubber track, and the wear rate is evaluated making use of the frictional energy and a wear model.

• Journal of Korean Medicine Rehabilitation
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• v.28 no.2
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• pp.135-148
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• 2018

The objective of this study is to investigate conservative treatment of pelvic fracture, and report that Korean rehabilitation treatment is effective for pelvic fracture. We reported a case about pelvic fracture treated with Korean rehabilitation treatment. We searched 10 domestic electronic databases to find reports on conservative treatment of pelvic fracture. We selected and analyzed 12 studies. In this case, pain, range of motion, and Oswestry Disability Index of patient were improved by Korean rehabilitation treatment. In analysis, traction, pelvic sling, hip spica cast, pelvic belt, medication are used in western medical treatment. Acupuncture, herbal medicine, cupping, moxibustion, physical therapy, manual therapy are used in Korean medical treatment. Most of conservative treatments are effective for pain, bone union, osteoporosis, dysfunction. In this study, we expect further study of Korean rehabilitation treatment program for pelvic fracture to compensate existing conservative treatment.