• Journal of the Korean Society of Propulsion Engineers
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• v.16 no.3
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• pp.49-56
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• 2012

Rupture disks are a kind of safety device in high pressure equipment and they are used to control rupture pressure in the solid rocket motor. In this paper, a series of rupture experiments was performed using rupture disks made of AISI 316L and rupture pressure of rupture disks was calculated through various assumptions in relation between elasto-plastic material properties and true stress-strain curve. Experiment and FEA indicated rupture pressure is determined by size of rupture disks. As a result of elasto-plastic analysis, only multi-linear stress-strain curve was able to calculate meaningful estimations. Experimental results also showed rupture location are decided by the size of rupture disks. Experimental and FEA results will be applied to control rupture pressure of disks.

• 대한관절경학회:학술대회논문집
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• 2009.10a
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• pp.8-13
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• 2009

견갑하근의 단독 파열은 드물고 또 이에 대한 치료와 관련된 논문도 한정적이었으나 최근 관절경 술식의 발달로 견갑하근 파열의 진단과 치료방식이 발전하고 있다. 이러한 관점에서 견갑하근의 중요성이 더욱 대두되었고 이에 견갑하근의 파열양상, 봉합방법 그리고 후상방회전근 개 파열과의 관련성 등이 여러 저자들에 의해서 연구 되고 있다. 즉, 이전까지 관심의 대상에서 제외 되었던 견갑하근의 부분파열이 점차적으로 회전근 개 파열의 중요한 역할을 하며 상완 이두건초염과 오구상완 인대의 내측활차의 손상이 이러한 부분파열의 원인을 제공할 수 있음을 알 수 있다. 그러나 견갑하근 파열에 대한 정확한 원인 인자는 아직 불투명하다.

• Journal of Korean Orthopaedic Sports Medicine
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• v.6 no.1
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• pp.45-49
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• 2007

Purpose: We analyzed the location and type of meniscus tear associated with ACL rupture in order to estimate and prepare whether the meniscus tear is in a repairable location. Materials and Methods: We reviewed 78 cases who had ACL reconstructive surgery due to ACL rupture. We set the period of acute injury on the basis of under 12 months after trauma. The location and type of meniscus tear was analyzed in accordance with MRI findings and arthroscopic findings. Results: The 50 cases of meniscus tear were detected out of the 78 ACL rupture;32 cases were lateral meniscus tears, 24 were medial meniscus tears and 6 cases were both menisci tears. From a total of 56 meniscus tears, 30 cases were longitudinal tears, 22 cases were red-red zone tears and 35 cases(62%) were posterior horn tears. Conclusion: The most common type of meniscus tear associated with ACL rupture war longitudinal tear at the red-red zone or meniscosynovial junction. Majority of the tears located at that place can be healed with conservative treatment, arthroscopic meniscus suture.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.481-487
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• 2011

This paper provides a comparison between finite element analysis results and test data of rupture disc. Rupture disc is safety device of high pressure equipment. Rupture disc of solid rocket motor is a device to control rupture pressure. Rupture discs were made of AISI 316L. By the elastic-plastic analysis, the stress limit of rupture discs were compared to the test results. The results can be used to control the rupture pressure by the change of the disc size.

• Journal of the Korean Arthroscopy Society
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• v.13 no.3
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• pp.201-204
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• 2009

견갑하근 파열의 손상과 치료방식이 발전하면서 견갑하근의 중요성이 더욱 대두되었고 이에 견갑하근의 파열양상, 봉합방법 그리고 후상방 회전근 개 파열과의 관련성 등이 여러 저자들에 의해서 연구 되고 있다. 즉, 이전까지 관심의 대상에서 제외 되었던 견갑하근의 부분파열이 점차적으로 회전근 개 파열의 중요한 역할을 하며 상완 이두건초염과 오구상완 인대의 내측활차의 손상이 이러한 부분파열의 원인을 제공할 수 있음을 알 수 있다. 그러나 견갑하근 파열에 대한 정확한 원인 인자는 아직 불투명하다. 이에 본 교실에서는 견갑하근 파열의 치료와 견갑하근 파열과 동반 손상된 상완 이두건 손상및 탈구 등을 치료하고 이에 대해 문헌 고찰과 함께 손상 종류에 따른 치료방법을 살펴보고 이에 대해 알아보고자 한다.

• Clinics in Shoulder and Elbow
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• v.11 no.2
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• pp.96-103
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• 2008

Purpose: This study investigated the rate of retear and related factors after arthroscopic repair of rotator cuff tears involving more than one tendon. Materials & Methods: Arthroscopic repair of 22 rotator cuff tears (average size 3.2cm: average age 58 years old) involving the supraspinatus and part or all of the infraspinatus were investigated using MRI on average 10 months after repair. The status of the repaired cuff was investigated using Sugaya's classification, and the change in muscle was evaluated with Goutallier's classification. Results: Retear (Sugaya grade IV, V) was found in 7cases(32%). Tears larger than 3cm had a higher retear rate(67%) than smaller tears(8%). Retear cases had Goutallier grade II or higher muscle changes preoperatively and showed aggravation of muscle atrophy postoperatively. Even without retear, reversal of muscle change was not seen Conclusion: Rotator cuff tears not confined to the supraspinatus had a 32% retear rate after arthroscopic repair. The size of the tear was the most crucial factor influencing retear. Retear was frequent in tear over 3cm. Atrophy of the cuff muscle worsened when the repair failed but did not improve even without retear.

• 건강소식
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• v.37 no.3
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• pp.30-31
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• 2013

봄철 무리한 운동으로 발생하기 쉬운 어깨 통증. 어깨 통증을 단순 근육통으로 여기고 방치하면 일상생활이 어려울 수도 있다. 관절와순 파열과 회전근개 파열이 대표적이다. 관절와순 파열은 일반적으로 스포츠 손상이 원인으로 주로 젊은층에게 흔하며, 회전근개 파열은 퇴행성 변화 및 외상이 원인으로 중 장년층에서 흔히 발생한다.

• Journal of the Korean Society of Propulsion Engineers
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• v.14 no.5
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• pp.101-110
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• 2010

Dual pulse rocket motor is a solid motor with two grains separated by a bulkhead and rupture disc. The elasto-plastic explicit dynamic analysis for the rupture disc was conducted by finite element method. The effect of the slit geometry of a rupture disc was parametrically analyzed in terms of rupture time and shape. The results can be used to control the rupture pressure by changing the slit geometry of rupture disc.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.261-264
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• 2010

Dual Pulse Rocket Motor is a solid rocket motor with two grains separated by a bulkhead and rupture disc. The elasto-plastic explicit dynamic analysis of rupture disc was conducted by the finite element method. The effect of the slit geometry of rupture disc with radial slit was parametrically analyzed in terms of rupture time and shape. The results can be used to control the rupture pressure by changing the slit geometry of rupture disc.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.05a
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• pp.105-112
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• 2010

Dual Pulse Rocket Motor is a solid rocket motor with two grains separated by a bulkhead and rupture disc. The elasto-plastic explicit dynamic analysis of rupture disc was conducted by finite element method. The effect of the slit geometry of a rupture disc was analyzed for rupture time and shape by the parametric study. The results can be used to control the rupture pressure by the change the slit geometry of a rupture disc.