• 대한족부족관절학회지
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• 제21권2호
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• pp.50-54
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• 2017

The goal of surgical correction for hallux valgus is to achieve a painless, shoe-wearable, and relatively straight toe with a balanced joint motion that results in aesthetically and functionally satisfactory toe. To date, there has not been a consensus on the ultimate surgical procedure for hallux valgus correction. Unfortunately, such a consensus may be difficult since it is not uncommon to encounter complications after hallux valgus correction. Postoperative soft tissue complications include difficult wound healing, infection, hypertrophy, or pain of the scar, joint stiffness, and tendon or sensory nerve damage. Postoperative bony complications include malunion, nonunion, failure of fixation, failure of angle correction, recurred deformity, osteomyelitis, and failure of balance between the metatarsal heads. Herein, we review common complications after surgical correction of hallux valgus, such as stiff joint, bony complications, recurrence of the deformity, and hallux varus.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.240-245
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• 2005

There has been a strong demand on more economic and lower depth girder bridges for short and medium span range, PRECOM, which is a new type steel-concrete composite girder, has been developed to realize a more economic bridge system with a lower depth girder. In the PRECOM girder bridge, a steel plate girder is simply supported and then concrete form is hung to girder. Thus, the self-weight of the concrete is loaded to the steel girder. To increase the resistance of concrete in the lower casing against tensile stress, compressive force is introduced by prestressed tendon To evaluate the manufacturability and performances of the completed bridge, four 15-m girders and a bridge specimen with two 20m girders wvere constructed. The camber during the construction and introduction of an appropriate compressive force was evaluated. Dynamic data were obtained through the modal testing of the completed girders. Static loading test was also conducted to examine cracks and evaluate the decrease in stiffness and failure behavior under extreme conditions.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.213-216
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• 2008

강관의 내부에 콘크리트를 충전한 구조인 콘크리트 충전 강관 구조(Concrete Filled Steel Tubular Structure, CFT 구조)는 강재와 콘크리트의 단점을 상호 보완하고 장점을 극대화 할 수 있다는 이점이 있다. 이와 같은 CFT 거더의 장점을 살리면서 CFT 거더보다 더 뛰어난 경제적, 구조적 효율성을 얻기 위해 기존의 CFT 구조에 아치 형식과 프리스트레스를 도입한 신형식 거더인 CFTA(Concrete-Filled and Tied Tubular Arch) 거더에 대한 연구가 현재 진행 중이다. CFTA 거더의 가장 큰 특징은 아치형상과 외부로 노출되어 있는 텐던인데 현재 연구과정에서 지적되고 있는 문제점 중의 하나는 외부로 노출된 텐던의 안전성에 관한 문제이다. 따라서 본 논문에서는 외부로 노출되어 있는 텐던에 대한 안전성 평가를 수행하였다. 또한, collision numerical simulation을 사용하여 동적 충돌에 대한 해석도 수행하였다. 모델의 해석을 위해 유한요소 해석 결과의 신뢰성이 높고, 타 연구에서도 많이 사용되고 있는 ABAQUS 6.5-1을 이용하였다.

• Archives of Plastic Surgery
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• 제38권4호
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• pp.458-464
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• 2011

Purpose: Metacarpal fractures are common hand injury that may require operative intervention to ensure adequate reduction and stabilization. Traditionally, titanium miniplate was used for rigid fixation of bone fractures. However, the use of permanent plate lends itself to multiple complications such as infection, exposure of the hardware, tendon adhesions, tendon rupture, prolonged pain, bony atrophy and osteoporosis (stress shielding), metal sensitization, and palpation under the skin. This study evaluated the usefulness and stability of biodegradable plates and screws for treatment of metacarpal bone fractures. Methods: There was 17 patients who had surgery for metacarpal bone fracture from April 2007 to June 2010. All patients had open reduction and internal fixation. We used absorbable plates and screws (Inion CPS$^{(R)}$) for internal fixation. Postoperative results were assessed with x-ray. Stability of plates and screws, healing process and its complications were observed by clinical and radiographic assessment. Results: All patients were successfully reduced of bone fracture, and fixations with absorbable plates and screws were stable. The mean follow up period was 7.1 months. 2 patients complained postoperative pain, but they were relieved with analgesics. All patients experienced transient stiffness, but they were relieved with active assistive range of motion after removal of splint. No patients suffered complications which could be occurred by using metallic plate. Conclusion: There was no critical complications such as re-fracture or nonunion among patients. No patients suffered side effects related with metallic implants. Biodegradable implants can offer clinically stable and attractive alternative to metallic implants to stabilize metacarpal bone fractures in the hand.

• 한국정밀공학회지
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• 제30권4호
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• pp.434-441
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• 2013

Bending motion has been used in the surgical instruments with bending structures and tendon mechanisms. A simplified bending angle amplification ratio between the proximal and distal bending joint was derived in this article. The bending structure of disk and rib in the proximal joint was analyzed based on finite element method with an emphasis on the circumferential uniformity of bending stiffness. Regarding the distal joint, optimal design and sensitivity analysis was done with four design variables of outer and inner diameter, rib height and rib width while maximizing the deformation under the stress distribution below the yield stress. Outer diameter and rib width are most critical to maximum deformation as the outer diameter and inner diameters are so to maximum equivalent stress.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제29권3호
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• pp.227-232
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• 2007

The radial forearm fasciocutaneous flap(RFFF) is a well-known flap for the reconstruction of oral and maxillofacial defects. It was first described by Yang et al. in 1981 and Soutar et al. developed it for the reconstruction of intraoral defect. RFFF provides a reliable, thin, and pliable soft tissue/skin paddle that is amenable to sensate reconstruction. It also has a long vascular pedicle that can be anastomosed to any vessel in either the ipsilateral or contralateral neck. However, split thickness skin graft(STSG) is most commonly used to cover the donor site, and a variety of donor site complications have been reported, including delayed healing, swelling of the hand, persistent wrist stiffness, reduced hand strength, and partial loss of the graft with exposure of the forearm flexor tendon. Various methods for donor site repair in addition to STSG have been developed and practiced to minimize both functional and esthetic morbidity, such as direct closure, V-Y closure, full thickness skin graft, tissue expansion, acellular dermal graft. We got a good result of using artificial dermis($Terudermis^{(R)}$) and secondary STSG for the repair of RFFF donor site defect esthetically and report with a review of literature.

• 로봇학회논문지
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• 제12권4호
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• pp.419-424
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• 2017

Twisted string actuators (TSAs) are tendon-driven actuators that provide high transmission ratios. Twisting a string reduces the length of the string and generates a linear motion of the actuators. In particular, TSAs have characteristic properties (compliance) that are advantageous for operations that need to interact with the external environment. This compliance has the advantage of being robust to disturbance in force control, but it is disadvantageous for precise control because the modeling is inaccurate. In fact, many previous studies have covered the TSA model, but the model is still inadequate to be applied to actual robot control. In this paper, we introduce a modified variable radius model of TASs and experimentally demonstrate that the modified variable radius model is correct compared to the conventional variable radius string model. In addition, the elastic characteristics of the TSAs are discussed along with the experimental results.

• 대한약침학회지
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• 제11권4호
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• pp.87-94
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• 2008

Purpose In order to estimate clinical effects of Oriental Medicine Treatment with acupotomy therapy of Achilles Tendinitis Methods From 4th August, 2008 to 14th August, 2008, 1 female patient diagnosed as Chronic Achilles Tendinitis (clinical diagnosed) was treated with general oriental medicine therapy(acupuncture, moxibustion, cupping, physical therapy, herbal medication) and acupotomy. Results The patient's chief complaints- Lt. heel pain and stiffness, dorsi-flexion limitation, nodules in the achilles tendon- were notably improved. Conclusions This study demonstrates that oriental medical treatment with acuputomy therapy has significant effect in improving symptoms of achilles tendinitis. as though we had not wide experience in this treatment, more research is needed.

• 한국안전학회지
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• 제27권6호
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• pp.84-92
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• 2012

Anchorage zone in prestressed concrete cable stayed bridges is very important area due to the more accurate analysis is needed to estimate the behavior. In the study, since the cable anchorage zone in the prestressed concrete cable-stayed bridge is subject to a large amount of concentrated tendon forces, it shows very complicated stress distributions and causes a serious local cracks. Accordingly, It is necessary to investigate the parameters of affecting the stress properties, such as the cable inclination, the position of anchor plate, the modeling method and the three dimensional effect. The tensile stress distribution of anchorage zone is compared to the actual design condition by varing the stiffness of spring element in the local modeling and an appropriate position of anchor plate is determined. These results would be elementary data to the stress state of anchorage zone and more efficient design.

• Clinics in Shoulder and Elbow
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• 제12권2호
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• pp.207-214
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• 2009

목적: 관절경 하 회전근 개 봉합에서 일반적으로 건-봉합간 접촉면 (tenon-suture interface) 에 약한부위 (weak link)가 형성되어 있어 관절경 하 회전근 개 봉합은 개방적 봉합술보다 높은 재파열율을 가진다. 이 연구의 목적은 봉합사를 뼈에 고정할 때 관절경으로 사용할 수 있는 UU (Ulsan University) 봉합과 개방적 변형 MA (Mason-Allen) 봉합의 강도를 비교하는 것이다. 대상 및 방법: 한 구의 사체 극상근 건을 채취하여 절반으로 나눈 후 다시 절반을 나누어 사체의 어깨 관절 한 구당 네 개의 건을 만들어 총 24개의 검체를 만들었다. 두 봉합 형태 (UU, MA)는 무작위로 선택하였으며 각각의 건에 시행하였다. 검체는 0.25 Hz에서 5~30N의 조절된 외력하에서 50회 주기 부하 (cyclic loading)를 받았다. 각 검체는 초당 1mm의 전이가 되는 상황하에서 파열이 발생할 때(ultimate tensile load)까지 부하를 받았다. 조건 이완 (condition elongation), peak-to-peak 전이(displacement), 기울기 (stiffness), 최대 인장력 (ultimate tensile load), 파열 양상 (mode of failure) 등을 기록하였다. 결과: 주기 부하 실험에서 두 봉합 형태 간 유의 있는 차이는 없었다. 최대 장력 실험에서 UU 봉합과 변형 MA (Mason-Allen) 봉합 간에 통계학적으로 유의한 차이는 없었다 (109.4 N, and 110.6 N). 양 봉합 형태에서 가장 흔한 파열 양상은 봉합의 빠짐 (suture pull-out)이었다. 결론: UU 봉합과 변형 MA 봉합은 유사한 생역학적 특성을 가진다.