• 한국항해항만학회지
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• 제41권6호
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• pp.451-466
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• 2017

원양어선 제501 오룡호는 황천 중인 베링해에서 조업 후 피항하던 중 개구부를 통한 침수로 인하여 침몰하였으며 많은 선원들이 사망하고 실종되었다. 본 연구에서는 유체-구조 연성(Fluid-Structure Interaction, FSI) 해석기법의 고도 정밀 M&S(highly advanced Modeling & Simulation) 시스템을 사용하여 실선 침수 침몰 시뮬레이션을 수행하여 침몰사고의 과정을 정확하고 과학적으로 분석하고자 하였다. 베링해 침몰사고 시의 기상 및 해상상태를 객관적으로 확보하기 위하여 침몰사고 지역의 시간대별 기상 및 해상 시뮬레이션을 수행하여 침몰사고 당시 파랑과 강풍 등을 분석하고, 불규칙 파랑과 강풍 스펙트럼을 사용하여 구현하였다. 사고선박의 선체 도면 등을 통하여 선박의 선형, 배치 및 중량 분포와 외부 해수 침수 개구부 및 선내 침수 경로를 분석하고 주요 탱크들의 용적과 그들의 중량 분포를 추정하여 침수 침몰 시뮬레이션을 위한 시나리오를 작성하고, 사고선박의 전선과 유체(공기 및 해수)를 상세 모델링을 하였다. 본 연구를 통하여 침수 침몰사고는 단순한 복원성의 부족으로 인한 일반적인 전복 침몰사고와는 다소 차이가 있다는 것도 확인할 수 있었다.

• 한국작물학회지
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• 제34권3호
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• pp.280-287
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• 1989

분얼하는 옥수수 교잡종인 IK//IRI/B68과 분얼을 하지 않는 일대 교잡종 옥수수인 진주옥을 공시하여 이들 사이의 작물생장 과정을 비교·검토한 결과를 요약하면 다음과 같다. 1. 분얼형 옥수수인 IK//IRI/B68의 초장 및 생체중은 생육초기에는 진주옥보다 낮았으나 생육후기에서는 더 높게 나타났다. 2. 분얼형 옥수수 IK//IRI/B68의 개체당 평균 분얼수는 3.7개였으며, 주간과 분얼간의 생장은 비슷한 크기를 보였다. 3. 분얼형 옥수수인 IK//IRI/B68의 건물중은 생육초기에는 진주옥보다 낮았으나 생육후기에는 분얼의 증가에 따른 경엽의 증가로 높게 나타났다. 4. 분얼형 옥수수인 IK//IRI/B68의 LAI는 분얼 발생 이후부터 진주옥보다 높게 나타났는데 최고분 시기 이후인 춘현후 80일경에는 이들에 대한 LAI값이 각각 12.6과 5.8이었다. 5. 분얼형 옥수수인 IK//IRI/B68의 CGR은 진주옥보다 출현후 60일경까지는 낮았으나 분얼간이 신장 발달함에 따라 더 높게 나타났다. 6. 분얼형 옥수수인 IK//IRI/B68의 LAR 및 RGR은 진주옥보다 생육초기에는 더 높게 나타났는데, IK//IRI/B68의 RGR은 NAR과 LAR의 영향을 받는 반면에 진주옥의 RGR은 LAR에 의한 영향을 받는 것으로 나타났다.

• 한국임상수의학회지
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• 제37권3호
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• pp.163-167
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• 2020

A 13-month-old, 3.3 kg castrated male Shih-tzu presented with right hindlimb lameness. The physical examination revealed atrophy of the right thigh muscles, hyperextension of the stifle joint and external torsion of the tibia. On the radiographic examination, patella alta and genu recurvatum were observed. A biapical deformity of the tibia and external torsion of the distal tibia were detected by computed tomography (CT). A three-dimensional (3D) printed bone model was designed and constructed for the preoperative plan prior to surgery. Rectus femoris muscle transposition, femoral shortening ostectomy and open wedge osteotomy of the distal tibia were performed using hybrid external skele/t0al fixation (hybrid-ESF). A dynamic stifle flexion apparatus was used to prevent recurrence of a quadriceps contracture (QC). Intense physiotherapy was administered postoperatively. The dog began to use the affected limb one week after surgery. Functional improvement in the affected limb was observed, and full weight-bearing was possible at 3 months after surgery. Union of the osteotomy lines was observed at 3 months, and the stifle joint was fully movable at 7 months after surgery. Regarding the treatments for QC, these methods may be excellent candidates, as they do not lead to severe damage to the limb or amputation.

• 한국환경과학회지
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• 제24권12호
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• pp.1705-1710
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• 2015

The aim of the present study was to determine the effects of soil microbial agent with red ginseng marc on growth of watermelon during 5 months. The three treatments were distributed in a completely randomized design with four replicates per plot. After 1 week in planting dates, the growth of watermelon (full length, stem thichness, leaf length and lead width) showed no significant difference in all treatments. During elongation stage (20 days), soil microbial agent with red ginseng marc was increased by 5% in leaf thickness (May 23) and 7~14% in leaf length (May 16 and 23) when compared to other treatments. For changes in fruit bearing thickness, there were no differences among treatments. Characteristics of watermelon in harvest season have an effect on harvest and length, stalk length, naval length, weight, sugar content and yield, except for harvest and width. In particular, yields increased with treatments with two soil microbial agent (7~12%), indicating that soil microbial agent with red ginseng marc showed higher yield than the other treatments. In conclusion, red ginseng marc-treated soil microbial agents have a positive effect on the harvest season of watermelon and can provide useful information for the selection of the functional microbial properties and the registration of microbial fertilizer.

• 대한족부족관절학회지
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• 제11권2호
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• pp.221-225
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• 2007

Purpose: To evaluate the clinical results of operative treatment of the intra-articular calcaneal fracture with injectable calcium sulfate ($MIIG^{TM}$). Materials and Methods: Between March 2004 and October 2006, a total 19 intra-articular calcaneal fracture (16 patients) with a large bony defect that underwent operative treatment with plate fixation and injectable calcium sulfate ($MIIG^{TM}$) with minimum follow-up of one year following. The mean age at time of surgery was 44.7 years (23 to 54). All of the cases were type 2 and 3 on the basis of Sanders classification. The lateral L shaped approach was used in all cases. Full weight bearing on the affected extremity was regained at an average 10 weeks postoperatively. Results: The mean Bohler angle was improved from $2^{\circ}$ ($-18.5{\sim}12.5^{\circ}$) preoperatively to $23.8^{\circ}$ ($12{\sim}37.5^{\circ}$) and the angle at last follow-up was $22.5^{\circ}$ ($11.5{\sim}37.5^{\circ}$), showing about 0.3 degree decline compared to postoperative Bohler angle. Only two case of whitish leakage of graft material but other complication were none. Conclusion: $MIIG^{TM}$ augumentation of displaced intra-articular calcaneal fracture with large bone defect seems to bo useful method for initial stabilized and plate fixation.

• 대한족부족관절학회지
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• 제8권2호
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• pp.166-170
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• 2004

Purpose: To evaluate the results of MIPPO (minimal invasive percutaneous plate osteosynthesis) technique for distal tibial metaphyseal fractures. Materials and Methods: It is a retrospective study of 13 patients who were treated by MIPPO technique for distal tibial metaphyseal fractures from Jan. 2001 to Jan. 2003. The average age was 46.7 years and mean follow-up period was 13.3 months. According to AO classification, there were 8 cases of A1, 3 cases of A2, 1 case of B1 and 1 case of C2. One case of A1 was a Gustilo-Anderson type I open fracture and fibular fractures were combined in 12 cases. We applied anatomical reduction and internal fixation for the fibular fractures and internal fixation on the medial side of the tibia by MIPPO technique for distal tibial metaphyseal fractures. Clinical results were evaluated using radiographic results, Neer score, the starting time of postoperative exercise and clinical complications. Results: According to the Neer score, all cases showed satisfactory results. Active ankle ROM was started at average 2.4 weeks ($2{\sim}4$ weeks) and full weight bearing ambulation at average 5.2 weeks ($4{\sim}8$ weeks) postoperatively. Union of fractures was obtained by average 14.4 weeks ($8{\sim}18$ weeks) postoperatively. Two cases showed $5^{\circ}$ limitation of motion without functional deficits and other cases showed satisfactory ROM results. One case had $6^{\circ}$ valgus deformity without functional deficits. There were not any other complications like soft tissue problems and delayed-or non-union. Conclusion: MIPPO technique for the treatment of distal tibial metaphyseal fractures is a feasible technique with a good clinical outcomes.

• Archives of Plastic Surgery
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• 제32권4호
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• pp.539-542
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• 2005

Reconstructions of soft tissue defect of the posterior ankle including Achilles the tendon should take into account not only coverage but functional outcome. Various methods of tendon transfer and tendon graft have been reported as a single-stage procedure. With advances and refinements in microsurgical techniques, several free composite flaps including tendon, fascia, or nerve have been used in single-stage reconstructions of large defects in this area minimizing further damage to the traumatized leg. However, when free flap is not feasible for some reasons, this cannot be accomplished successfully. Here we present a patient with Achilles tendon and circumferential large soft tissue defect. Because of circulatory compromise of the lower extremity, free flap reconstruction could not be applied. Instead, cross-leg composite flap of the dorsalis pedis flap including the extensor hallucis brevis musle and tendon, and tendon strips of the Second, third and fourth extensor digitorum logus were employed, Functional reconstruction of the tendon and resurfacing were obtained at the same time. The flap was detached 3 weeks postoperatively, and the transplanted flap has survived without any complications. By 3 months after surgery, full weight bearing, tip-toe standing and even walking without crutch assistance was possible. When functional reconstruction with the free flap is unattainable in the large defect of the posterior ankle including the Achilles tendon, cross-leg composite island flap of dorsalis pedis flap and tendon strips of the extensor digitorum longus tendon is a viable alternative.

• Archives of Reconstructive Microsurgery
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• 제23권2호
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• pp.76-81
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• 2014

Purpose: Anteromedial surface of the leg is susceptible to trauma, which frequently induces soft tissue defect. When the size of a soft tissue defect is small to moderate, a local muscle flap is an easy and reliable alternative to a free flap. The authors performed medial hemisoleus flaps for reconstruction of soft tissue defects on the anteromedial surface of legs. The aim of this study was to evaluate clinical outcomes and effectiveness of the medial hemisoleus flap. Materials and Methods: Twelve patients underwent the medial hemisoleus flap for reconstruction of a soft tissue defect on the anteromedial surface of the leg from February 2009 to December 2013. There were eight males and four females with a mean age of 47.8 years (15 to 69 years). The mean size of defects was $4.7{\times}4.2cm$ ($2{\times}2$ to $9{\times}6cm$). Flap survival and postoperative complications were evaluated. Results: Mean follow-up period was 39.6 months (7 to 64 months) and all flaps survived. There were two cases of negligible necrosis of distal margin of the flap, which were healed after debridement. All patients were capable of full weight bearing ambulation at the last follow-up. Conclusion: The medial hemisoleus flap is a simple, reliable procedure for treatment of a small to moderate sized soft tissue defect on the anteromedial surface of the leg.

• Steel and Composite Structures
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• 제22권4호
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• pp.855-874
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• 2016

In this paper, it is aimed to evaluate the earthquake angle influence on the seismic performance of steel highway bridges. Upper-deck steel highway bridge, which has arch type load bearing system with a total length of 216 m, has been selected as an application and analyzed using finite element methods. The bridge is subjected to 1992 Erzincan earthquake ground motion components in nineteen directions whose values range between 0 to 90 degrees, with an increment of 5 degrees. The seismic weight is calculated using full dead load plus 30% of live load. The variation of maximum displacements in each directions and internal forces such as axial forces, shear forces and bending moments for bridge arch and deck are attained to determine the earthquake angle influence on the seismic performance. The results show that angle of seismic input motion considerably influences the response of the bridge. It is seen that maximum arch displacements are obtained at X, Y and Z direction for $0^{\circ}$, $65^{\circ}$ and $5^{\circ}$, respectively. The results are changed considerably with the different earthquake angle. The maximum differences are calculated as 57.06%, 114.4% and 55.71% for X, Y and Z directions, respectively. The maximum axial forces, shear forces and bending moments are obtained for bridge arch at $90^{\circ}$, $5^{\circ}$ and $0^{\circ}$, respectively. The maximum differences are calculated as 49.12%, 37.37% and 51.50%, respectively. The maximum shear forces and bending moments are obtained for bridge deck at $0^{\circ}$. The maximum differences are calculated as 49.67%, and 49.15%, respectively. It is seen from the study that the variation of earthquake angle effect the structural performance of highway bridges considerably. But, there is not any specific earthquake angle of incidence for each structures or members which increases the value of internal forces of all structural members together. Each member gets its maximum value of in a specific angle of incidence.

• Steel and Composite Structures
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• 제26권6호
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• pp.719-731
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• 2018

Concrete filled steel tubular (CFST) laced columns have been widely used in high rise buildings in China. Compared to solid-web columns, this type of columns has a larger cross-section with less weight. In this paper, four concrete filled steel tubular laced columns consisting of 4 main steel-concrete tubes were tested under cyclic loading. Hysteresis and failure mechanisms were studied based on the results from the lateral cyclic loading tests. The influence of each design parameter on restoring forces was investigated, including axial compression ratio, slenderness ratio, and the size of lacing tubes. The test results show that all specimens fail in compression-bending-shear and/or compression-bending mode. Overall, the hysteresis curves appear in a full bow shape, indicating that the laced columns have a good seismic performance. The bearing capacity of the columns decreases with the increasing slenderness ratio, while increases with an increasing axial compression ratio. For the columns with a smaller axial compression ratio (< 0.3), their ductility is increased. Furthermore, with the increasing slenderness ratio, the yield displacement increases, the bending failure characteristic is more obvious, and the hysteretic loops become stouter. The results obtained from the numerical analyses were compared with the experimental results. It was found that the numerical analysis results agree well with the experimental results.