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하동우;오상수;하홍수;이남진;고락길;권영길;류강식
- Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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- 2002.02a
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- pp.165-167
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- 2002
NbTi/Cu superconducting wires were jointed inserting the NbTi filaments into Cu/NbTi sleeve and pressing it. When the NbTi filaments were inserted into Cu/NbTi sleeve, additional NbTi filaments were inserted together to increase the numbers of filaments in the hole of sleeve. Critical current of the joint of 28 filaments wires with 1.7 mm thickness of dimple was 450 A at 4.2K, 0.5T. Ic of the joint of 54 filaments wires with 2.0 mm thickness of dimple was 600 A at 4.2K, 2T. It is possible to manufacture MRI magnet by using these results.
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Yoo Jeung-Sang;Jang Woo Jin;Lee Byung-Song
- Proceedings of the KSR Conference
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- 2003.10c
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- pp.523-528
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- 2003
AS City traffic means, the electric railway of the role is overwhelming with recognizing good merits of safety, no environment disruption and accurate destination time. Currently, Korea subway are running about 290km through eight subway lines. The latest constructed subway had been made by imperoved matherials which is going on improving. Therefore, we researched this project to keep up facilites easily, repress a leakge current and reduse install cost and repair time in changing facility at overhead Contact wire system because of arc by reforming construction plan about Expansion Joint and Air Section which is regarded as weak point when facilities are fixed and maintianed of Rigid Trolley bar System. as above we can contribute various part to making useful O.C.S(overhead contact wire system)
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Shin, Seong-Hyoo;Lee, Hyo-Keun;Kwon, Moon-Seok
- Korean Journal of Applied Biomechanics
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- v.18 no.2
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- pp.75-83
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- 2008
The purpose of this study was to evaluate the correlation between joint moment and joint position angle according to the different walking speeds. According to the different walking speeds(1.5m/s, 1.8m/s, 2.1m/s), experiments were terminated by 8 male subjects. In conclusion, 1. The peak extensor moment of knee joint increased by increasing walking speed, however, walking speed didn't have an effect on peak flexor and abductor moment of knee joint. 2. The position angle of knee joint increased movement of flexion, but other position angles of knee joint didn't have difference when the peak extensor moment generated. 3. The peak joint moment of hip significantly increased in extension, flexion and abduction by increased walking speed. 4. The hip position angle showed more flexible at the hip peak flexor/extensor moment generated. 5. The co-ordination pattern between peak knee joint moment and knee position angle were mathematically modeled by using a least square method. We could get the high level value of R2. We expect to apply this results for evaluating the physical faculty of knee joint.
https://doi.org/10.5103/KJSB.2008.18.2.075 인용 PDF

Lee, Ka Ram;Hwang, Chan Youn;Park, Eun Kyeong;Yoo, Young Tae
- Laser Solutions
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- v.16 no.3
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- pp.11-21
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- 2013
As parts are becoming more complex and smaller with the development of new materials, high-quality laser precision processing is getting the limelight. Laser enables quick processing and less deformation of materials. It also enables welding with diverse materials. In this study, the pole rod and tap for the secondary battery were laser-welded using cross and coaxial nozzles. The results of the comparative analysis of cross and coaxial nozzles according to the processing parameters showed that the coaxial nozzle had more sensitive welding characteristic to the nozzle position or pressure than the cross nozzle. This indicated that the processing parameters should be carefully determined for the welding with the coaxial nozzle. The pole rod and tap were welded together in a form of T joint to improve the output of the secondary battery, and the cross nozzle had a better welding characteristic than the coaxial nozzle.
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