• Archives of Plastic Surgery
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• 제37권3호
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• pp.259-264
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• 2010

Purpose: Most surgeons have used autogenous cartilage for columella strut graft. But the supply of autogenous cartilage is often limited. So, this study is to investigate the usefulness of biodegradable plate as columella strut material. Methods: We studied 19 patients who have secondary cleft nasal deformity. Patients were divided into two groups. Group A patients who were not closed their growth plate underwent columella strut graft only with biodegradable plate through endonasal approach. The biodegradable plate was inserted between nasal tip and anterior nasal spine. Group B patients were closed their growth plate. They had an operation for columella strut graft with biodegradable plate fixed with autogenous conchal cartilage. If nasal tip projection was insufficient, we performed additionally onlay graft on nasal tip with autogenous soft tissue or remnant cartilage. Results: As a result of mean 14 months follow-up, we achieved a good nasal tip projection, narrowing of interalar distance and symmetrical nostril shape. No specific complications were reported except 2 cases, which were the extrusion of biodegradable plate into the nasal cavity and Staphylococcus aureus infection. Conclusion: The columella strut graft using biodegradable plate is simple and effective method. Biodegradable plate can be a good substitute for columella strut in patients who can not use autogenous cartilages.

• Plant Biotechnology Reports
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• 제4권1호
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• pp.53-59
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• 2010

A specific deleted version of ARABIDOPSIS RESPONSE REGULATOR1 (ARR1) lacking the signal receiver domain (1.152 amino acids)-coding sequence, referred to as $ARR1{\Delta}DDK$, was amplified using Arabidopsis thaliana cDNA prepared from adult leaves and transferred into the genome of Nicotiana tabacum cv. Samsun under the transcriptional control of a ${\beta}$-estradiol-inducible expression system. The ectopic expression of $ARR1{\Delta}DDK$ affected the morphology of transgenic seedlings and their segments in vitro. In the presence of an inducer, ${\beta}$-estradiol, ectopic expression of $ARR1{\Delta}DDK$ induced only the formation of soft, pseudo-bulbous tissue in the root tip region of intact seedlings, which appeared similar to callus generated on a hypocotyl segment in the presence of 2,4-D and 6-benzyladenine (BA), both at $1\;{\mu}M$. Those callus tissues on the root tip region could not generate shoots unless $1\;{\mu}M$ BA was supplied. In segment culture, ectopic expression of $ARR1{\Delta}DDK$ induced calluslike tissue around the cut-end of cotyledon and hypocotyl segments with occasional shoot formation, suggesting that the expression of $ARR1{\Delta}DDK$ could substitute for the effects of cytokinin on these segments. Additionally, treatment with only ${\beta}$-estradiol induced NtWUS, a WUS ortholog in tobacco, which was detected during the process of callus tissue formation in the root tip region and also in cotyledon or hypocotyl segments. These findings suggest that the NtWUS might be associated in the transdifferentiation process caused by the functional regulation of $ARR1{\Delta}DDK$ in transgenic tobacco seedlings.

• 한국지반공학회논문집
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• 제37권11호
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• pp.7-22
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• 2021

본 연구에서는 현장타설말뚝에서 실시된 양방향말뚝재하시험 자료에 대하여 역해석을 실시하였다. 그리고 실트질 점토, 실트질 모래, 모래질 실트, 모래질 자갈, 풍화암, 연암의 다양한 선단지반에 지지된 대구경 현장타설 말뚝에 대하여 수치해석을 실시하여 지지력을 분석하였다. 지지력 분석은 P-S 방법, Davisson 방법, 25.4mm 허용침하량을 이용하여 산정하였다. 3가지 방법으로 분석한 최소 허용지지력은 19.64MN ~ 24.96MN으로 나타났다. 이때, 선단지지력은 두부재하하중의 2% ~ 12%를 분담하였으며, 주면마찰력은 두부재하하중의 88% ~ 98%를 분담하였다. 선단 지반의 강도가 클수록 허용지지력이 증가하는 것으로 나타났다. 그러나 최대 허용지지력과 최소 허용지지력의 차이는 5.32MN로 선단 지반종류에 따른 허용지지력의 증가는 27%에 불과하였다.

• 한국산학기술학회논문지
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• 제11권5호
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• pp.1814-1819
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• 2010

본 연구에서는 현재 OCR(과압밀비) 값 결정을 위하여 실용적으로 많이 활용되고 있는 경험적 방법인 정규화 콘팁저항치과 과압밀비의 관계상수법에 대하여 분석하였다. 이를 위하여 창원 북면 및 인천 서북면 지역의 연약점 토지반에 대하여 관계상수를 산정하고 고찰하였다. 연구결과, 관계상수 값은 창원북면의 경우 0.28~0.33, 인천 서북면의 경우 0.49~0.6으로, 해외의 기존 연구결과 보다 최대 90% 크게 비안전측으로 산정되어 향후 콘팁저항치와 과압밀비의 관계상수법 사용에 주의가 필요하다 하겠다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 춘계 학술발표회
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• pp.464-475
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• 2009

Electrical resistivity can be used for porosity estimation. In order to improve previously developed ERCP(Electrical Resistivity Cone Probe), 4ERP(4 Electrical Resistivity Probe), which has Wenner array at the tip of probes, has been developed. In properties of current flow Wenner array measures electrical properties of undisturbed area during penetration and relatively correct measurements are guaranteed without polarization. Furthermore, Wenner array equation can estimate electrical resistivity without extra calibration. 4ERP is developed into 2 types, penetration and fixation. Penetration type has wedge-shaped tip. Considering disturbance minimization, fixed type has plane tip. Fixed type 4ERP in consolidation cell measure electrical resistivity increment along porosity decrease, and penetration type 4ERP measured resistivity profile along the depth in chamber. Applying Archie's law, porosity profile was estimated with electrical resistivity. The tests result suggests that 4ERP can be new site investigation equipment with little disturbance.

• 대한두개안면성형외과학회지
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• 제20권6호
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• pp.397-400
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• 2019

Frontonasal dysplasia is an uncommon congenital anomaly with diverse clinical phenotypes and highly variable clinical characteristics, including hypertelorism, a broad nasal root, median facial cleft, a missing or underdeveloped nasal tip, and a widow's peak hairline. Frontonasal dysplasia is mostly inherited and caused by the ALX genes (ALX1, ALX3, and ALX4). We report a rare case of a frontonasal dysplasia patient with mild hypertelorism, a broad nasal root, an underdeveloped nasal tip, an accessory nasal tag, and a widow's peak. We used soft tissue re-draping to achieve aesthetic improvements.

• Journal of Trauma and Injury
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• 제32권3호
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• pp.181-186
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• 2019

Finger reconstruction involves paramount significance of both functional and aesthetic aspects, due to its great impact on quality of life. The options range from primary closure, skin grafts, local flaps, pedicled flaps, and free flaps. The optimal method should consider various circumstances of the patient and surgeon. We would like to report a case of a young woman who initially presented with cellulitis and necrosis of the left second finger-tip who underwent reconstruction with bilateral toe pulp free flap. The patient could successfully return to her job that involves keyboard typing and playing the piano, with acceptable donor site morbidity.

• 지구물리와물리탐사
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• 제19권4호
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• pp.187-199
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• 2016

연약지반의 층서 파악을 위해 대상 지역 전체에서 취득되는 다중채널 표면파 탐사(Multichannel Analysis of Surface Wave; MASW)와 지반에 대한 직접적인 정보를 제공하는 피에조콘 관입시험(Piezo Cone Penetration Test; CPTu) 자료를 지구통계학적으로 복합 분석하였다. MASW 자료는 지반 강성도와 밀접한 관계를 갖는 것으로 알려져 있는데, 2개의 측선에 대해 자료를 취득하고 연구 지역 시료의 실내시험을 통해 이를 확인하였다. CPTu는 대상지역 내 6개 지점에서 취득하였고 선단저항($q_c$) 및 간극수압(u) 자료에 지구통계학적 복합 분석을 적용하여 3차원 물성 분포를 확보하였다. 복합 분석은 MASW 자료와 선단저항 및 간극수압의 공간적 상관성에 따라 시뮬레이션 할 수 있는 순차 가우시안 공동 위치 시뮬레이션(Sequential Gaussian Co-Simulation; COSGSIM) 기술을 적용하였다. 분석 결과의 검증을 위해 CPTu 자료 취득 위치와 다른 2개 지점에서 시추가 이루어졌으며, 이 지점에서 SPT N 값과 시추 주상도를 확보할 수 있었고 이 자료를 복합 분석 결과의 지반 공학적 정확도 분석을 위해 사용하였다. 복합 분석을 통해 확보한 3차원 선단저항 및 간극수압 분포도의 신뢰성 검증을 위해 2개의 시추 지역에서 획득한 지반 조사 자료와 비교한 결과, 매우 상관성이 좋은 결과를 확인할 수 있었다.

• 한국공간구조학회:학술대회논문집
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• 한국공간구조학회 2005년도 춘계학술발표회 및 정기총회 2권1호(통권2호)
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• pp.89-98
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• 2005

Membrane structures, a kind of lightweight soft structural system, are used for spatial structures. The material property of the membrane has strong axial stiffness, but little bending stiffness. Therefore membrane structures arc unstable structures initially. These soft structures need to be introduced initial stresses first because of its initial unstable state, and it happens large deformation phenomenon. To find the structural shape after large deformation caused by initial stiffness introduced, we need the shape analysis considering geometric nonlinearity in structural design procedure. In this study, we investigate into the stress concentration at crack of membrane structures. Therefore, using the nonlinear analysis program that NASS (Nonlinear Analysis for Spatial Structures) perform nonlinear analysis, and stress distribution for creak length investigate for using linear elastic fracture mechanics.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회 3차
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• pp.104-110
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• 2010

In this study, a series of two-dimensional model test and numerical analysis was carried out to investigate the pile movement due to tunnelling in soft ground. The model test consists of 21 cases according to locations of the pile tip over the centre position of model tunnel. To identify both the pile and ground movements a close-range photogrammetric technique was adopted in the model test. The results from the model test were compared to the two-dimensional finite element analysis using the CRISP program. It was found that the rotation point on the pile was significantly affected by factors such as the offset distance from the model tunnel and the volume loss that occurred during the tunnelling operation.