• The Academic Congress of Korean Shoulder and Elbow Society
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• 2003.11a
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• pp.181-185
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• 2003

• The Academic Congress of Korean Shoulder and Elbow Society
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• 1999.03a
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• pp.32-32
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• 1999

• The Academic Congress of Korean Shoulder and Elbow Society
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• 2004.11a
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• pp.154-164
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• 2004

• The Academic Congress of Korean Shoulder and Elbow Society
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• 2005.11a
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• pp.110-115
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• 2005

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.5
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• pp.533-541
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• 2011

This paper presents a frequency-response test performed on an antagonistic actuation system consisting of two Mckibben pneumatic artificial muscles and a pneumatic circuit with pressure valves. Varying switching frequency to pressure valves from 0.1 Hz to 5 Hz, parameters of a linear model were estimated optimally to predict dynamic characteristics of the antagonistic actuation. A model-base control scheme with estimated parameters was built for the precise trajectory tracking of the antagonistic structure and realized on a reconfigurable embedded control system, CompactRIO. Experimental results showed that the proposed model-based control scheme gave good performance in trajectory tracking comparing with a PD control scheme when square wave and sinusoidal wave were given as references to follow.

• 월간 기계설비
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• no.10 s.183
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• pp.99-100
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• 2005

등산은 누구나 손쉽게 즐기는 국민 스포츠이다. 그러나 생각만큼 간단한 운동은 아니다. 의욕만 앞세우다 자칫 발목이나 무릎 관절에 무리를 줄 수 있으며, 심한 경우 관절이나 관절 주변 조직이 찢어져 수술을 받아야 한다. 관절이나 주변 조직의 부상은 만성 관절염으로 연결되기 쉬우며, 만성 관절염은 노후 인공관절 수술을 받게 되는 가장 큰 원인이 된다. 이번 호에서는 등산으로 인한 근육∙골격계 질환에 대해서는 알아보기로 한다. 이 내용은 동아일보에 게재된 내용을 발췌 정리한 것이다.

• The Journal of the Korean dental association
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• v.33 no.4 s.311
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• pp.264-273
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• 1995

2000년대에 있어서 세계의학계는 인공심장의 완성과 인공신장, 인공 간, 인공수족과 인공골, 관절, 혈관 등의 인공장기이식의 눈부신 연구, 발전에 의하여 인간의 수명은 더욱 연장될 것이며 사망률을 낮추는 치료의학은 한없이 발전하게 될 것이다. 치과의학의 과제는 상실된 치아와 악골, 구강내외 장기의 수복을 위한 인공치아 및 장기이식의 치료요법의 발전이 될 것이다. 인공치아 치료요법의 한가지인 nonsubmerged and one stage operation type인 I.T.I. 임프란트 시스템은 골성접착과 결합이 이루어지는 인공치아 이식술로서 그 단순한 시술과 높은 성공률에 의해 전세계에 각광을 받는 치료방법의 하나이다.

• Journal of the Korean Orthopaedic Association
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• v.56 no.1
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• pp.42-50
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• 2021

Purpose: Periprosthetic fractures of a tumor prosthesis are rare but have difficulties in achieving sound fixation because of the poor bone quality, which increases the risk of loosening or re-fracture, even after bone union. A cortical strut onlay allograft was adopted for peri-prosthetic fractures after hip arthroplasty into the periprosthetic fracture of a tumor prosthesis, assuming that it would assist in firm fixation, shorten the time to union, and increase the bone stock, thereby, lower the chance of loosening and re-fracture. Materials and Methods: This study reviewed 27 patients (30 cases) of periprosthetic fracture of tumor prosthesis. Sixteen cases (allograft group) had augmentation with an onlay allograft, while 14 cases (conventional group) had internal fixation or conservative treatment. The following were assessed; mode of periprosthetic fracture, difference in the time to union between a strut cortical onlay allograft and without it, and survival of prosthesis, complication, and functional outcome between the two groups. Results: According to the unified classification system (UCS), 21 cases were type B (70.0%; B1, 14; B2, 1; B3, 6) and 9 cases were type C. The five-, 10-year survival of the 30 reconstructions by Kaplan-Meier plot was 84.5%±4.18% and 42.2%±7.83%, respectively. The average time to bone union of the entire cohort was 5.1 months (range, 2.0-11.2 months). The allograft group (3.5 months) showed a shorter period for union than the conventional group (7.2 months) (p<0.0001). All four cases of major complications occurred in the conventional group. Two cases with loosening and anterior angulation were treated with a change of prosthesis, and another with infection underwent amputation. The remaining case with loosening had conservative management. At the final follow-up, the average Musculosketal Tumor Society score of the allograft group (26.1) was better than that of the conventional group (20.9). Conclusion: Bone union in periprosthetic fractures of a tumor prosthesis can be achieved, but the minimization of complications is important. An onlay allograft facilitates firm fixation and increases the bone stock with a shortened time to union. This simple method can minimize the risk of loosening, joint contracture, and re-fracture.

• The Academic Congress of Korean Shoulder and Elbow Society
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• 2008.03a
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• pp.51-51
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• 2008

• The Academic Congress of Korean Shoulder and Elbow Society
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• 2004.03a
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• pp.52-52
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• 2004