• Journal of the Korean GEO-environmental Society
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• v.11 no.11
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• pp.55-62
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• 2010

The settlements by liquefaction seldom occur uniformly because of soil homogeneity, however differential settlements are major cause of the damages to structures. From the past researches, author paid attention to the fact that stress history during undrained cyclic shear process affects greatly on the volumetric strains of the post-liquefaction. Therefore, the effect of the residual shear strain in cyclic shear process was examined in this study. The experiment apparatus based on strain control with volumetric strain control device was used for the study to investigate the effect of the residual strain on the relationship between volumetric strain and effective stress of clean and granite sandy soil. It could be seen an insignificant difference in the volumetric strain after liquefaction under various residual shear strain conditions in the case of clean sand. On the other hand, in granite sandy soil, the volumetric strain after liquefaction was small when the lower level of the residual shear strain was applied. And, the residual shear strain during cyclic shear affected the shape of the relation curve between effective stress and volumetric strain as well.

• Journal of Chest Surgery
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• v.30 no.4
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• pp.396-401
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• 1997

Tailoring thoracoplasty is employed prior to, following, or concomitant with pulmonary resection when it is anticipated that insufHclent lung tissue will remain to fill the pleural space following a pulmonary resection. This study reviewed a series of eight patients treated with tailoring thoracoplasty between 1990 and 1995. Indications were to close a persistent space In four patients and to tailor the thoracic cavity to accept diminished lung volume concomitant with a pulmonary resection in the other four patients. The primary underlying disease was lung cancer in three patients and pulmonary tuberculosis In five patients, two of whom had concomitant aspcrgilloma, two, pneumothora , and one, empyema with bronchopleural fistula. In four patients with a prior pulmonary resection, the tailoring thoracoplasty was performed within eight days after the resection surgery. There was no failure to accommodate the thoracic cavity to insufficient lung tissue, even though two patients needed a second thoracoplasty. We conclude that tailoring thoracoplasty may be performed to close anticipated persistent pleural space and to accommodate diminished lung volume with acceptable cosmetic results Early, after, or concomitant with pulmonary resection in selected patients.

• Journal of Chest Surgery
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• v.33 no.11
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• pp.876-880
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• 2000

배경: Maze수술은 승모판 질환에 동반되는 심방세동의 효과적인 치료방법으로 알려져있다. 이 연구는 승모판 수술과 심방세동 수술을 동시에 시행한 환자에서 심방세동 수술 후 중기적인 결과와 그 재발 여부를 조사하였다. 대상 및 방법: 심방세동 수술과 승모판 수술을 받은 11예의 환자(10예는 류마티스성 승모판 질환)를 대상으로 하였다. Maze II 수술 및 그 변형수술을 6예에서 시행했고, Maze III 수술 및 그 변형수술을 5예에서 시행하였다. 심방세동 수술 후 좌심방의 수축정도를 심방세동 수술 없이 승모판 수술만으로 동율동을 얻은 경우와 비교하였다. 결과: Maze II 수술을 받은 환자 6예 중 5예(83.3%)에서, maze III 수술을 받은 환자 5예 모두에서 동율동을 회복하였다(전체적으로 90.9%). 전자의 1예(20%)와 후자의 2예(40%)에서 수술 후 각각 23, 2, 13개월만에 심방세동이 재발하였다. 그 후 다시 2예는 동율동으로 전환되었으나, 1예는 재발된 심방세동을 그대로 유지하고 있다. 변형술을 받은 3예에서는 심방세동의 재발이 없었다. Maze 수술 후 4예(40%)에서만 좌심방의 수축기능을 보였으며, maze 수술 후 좌심방 수축 정도(승모판의 A파의 속도)도 maze 수술 없이 승모판 수술과 항부정맥제 투여로 동율동을 회복한 경우보다 낮았다. 결론: 심방세동을 동반한 승모판 수술 환자에서 maze 수술로써 심방세동으로부터 동율동을 회복할 수 있으나 중기적으로 재발할 수 있으며, maze 수술 후 좌심방 수축정도는 상당히 떨어질 수 있다고 생각된다.

• Journal of the Korean Arthroscopy Society
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• v.4 no.1
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• pp.25-31
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• 2000

Introduction : This study compared the clinical results with biceps rerouting fer the isolated posterolateral instability (PLI) and for the PLI combined with PCL injuries. Methods : 21 cases of isolated PLI (group I) and 25 cases of PLI combined with PCL rupture were included in the study. The PLI was reconstructed by modified biceps femoris rerouting technique with PCL reconstructions performed prior to the PLI correction in cases of combined injury The clinical results were reviewed and analyzed. Results : Pre-operatively positive reverse pivot shift test turned negative in 43 cases post-operatively. Increased preoperative external rotation thigh foot angle (ERTFA) showed significant differences between the two groups and all fell within normal limits post-operatively At a mean follow-up of 40.3 months, the average Lysholm knee score and. The Hospital for Special Surgery Knee Ligament Score for group I and group II revealed above 90 points without statistically significant difference between the groups. 3 cases of tenodesis failure developed and re-operation was performed. Discussion and Conclusion : The advantages of modified Clancy technique include reduced surgical damages to the iliotibial band and fixation of the biceps tendon at the isometric position. The modified biceps rerouting technique is recommended for the reconstruction of both isolated and combined PLI except in patients with severe damages at the attachment of biceps tendon.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04b
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• pp.625-627
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• 2000

최근 실시간 가상 인물 애니메이션 시스템이 활발하게 보급되면서 피부모양을 자연스럽게 유지하면서도 고속으로 동작할 수 있는 인체 변형 방법이 요구되고 있다. 본 논문은 가상 인물을 구성하는 메쉬의 정점들을 회전 연산만으로 이동시켜 실시간에 인체를 변형하는 모델을 제안한다. 인체 변형의 처리과정으로 드로니 삼각화를 이용하여 각 정점의 회전 기준이 될 관절을 찾는 방법을 제시하고, 사원수 형태로 입력된 동작을 회전축의 방향에 따라 분해한 후 각 정점에 차등적으로 적용하여 피부를 자연스럽게 변형할 수 있음을 보인다.

• Proceedings of the KWS Conference
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• 2004.05a
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• pp.229-231
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• 2004

다층 용접이 적용되는 후판 조립 부재에서는 각 조립단계별로 용접변형이 필연적으로 발생되고 있으며 용접변형의 교정을 위한 추가 작업도 각 조립간계 및 후 공정에서 반복적으로 수행되고 있다. (중략)

• Journal of Advanced Marine Engineering and Technology
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• v.21 no.5
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• pp.522-526
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• 1997

잔류 응력이 존재하는 부품의 가공 시에는 잔류 응력 상태가 새로운 평형 상태를 이루기 위해 재 분포되며 이는 가공 자체에 따른 변형 이와의 부가적 변형을 초래한다. 고도의 정밀도를 요하는 가공에는 이러한 잔류 응력에 의한 부가적 변형을 고려하여야 하며, 가공 후의 잔류 응력의 재 분포 상태는 가공 후 부품의 물질적 성능을 결정하는데 중요한 요소이므로 이를 예측할 수 있어야 한다. 본 연구에서는 잔류 응력에 의한 부가적 치수 변화를 고려한 가공 후의 부품의 내경 및 두께와 잔류 응력의 재 분포를 예측할 수 있는 이론적 수식을 제시하고 유한요소법에 의한 시뮬레이션의 결과와 비교하였다. 초기 잔류 응력의 분포는 autofrettage process에 의해 유도되었다.

• Journal of Oral Medicine and Pain
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• v.20 no.2
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• pp.347-360
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• 1995

악관절장애환자의 임상 평가를 위해서 고안된 여러 지수 중 현재 가장 널리 사용되고 있는 두개하악장애지수와 평가방법을 새로 고안한 변형 두 개하악장애 지수, 혼합두개하악장애지수를 비교하여 환자의 증상변화를 민감하게 감지하는 능력을 알아보고자 본연굴를 시행하였다. 두개하악장애지수의 기준에 따라 단국대학교 치과병원 구강내과에 내원한 악관절장애환자 20명을 대상으로 임상검사를 시행하여 두개하악장애지수, 변형두개하악장애지수, 혼합 두 개하악장애 지수를 산출하였다. 치료전, 치료후 2주, 치료후 4주에 수집된 결과를 각 지수간에 비교분석하여 다음과 같은 결과를 얻었다. 악관절장애환자의 증상평가에서 변형두개하악장애지수가 환자의 증상변화를 가장 민감하게 감지하는 것으로 나타났다(P(0.05). 따라서 사용된 세가지 지수중 변형 두개하악장애지수가 악관절장애환자의 경과를 관찰할 때 증상변화를 관찰하기 위한 가장 효과적인 방법이라고 사료된다.

• Journal of fish pathology
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• v.20 no.2
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• pp.129-137
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• 2007

Skeletal deformity in hatchery-reared river puffer (Takifugu obscurus) fingerlings occurred. The vertebral abnormality was recognized with naked eyes 80 days after hatching. Affected fish had a good appetite but no clinical signs were found except the vertebral abnormality. As more than 90% of the hatchery-reared fish exhibited vertebral abnormality, the fingerlings could not be used for commercial seeds any more. Morphological changes in the vertebrate and the swim bladder were observed with a soft X-ray. Histopathological changes on the caudal muscle around the deformed vertebrae, gill, and spleen were also examined to clarify the cause of the deformity. Spinal curvature occurred between vertebrae 10 and 12, but any malfunction of the swim bladder was not found. The diameters of the muscle fibers around the deformed vertebrae were much smaller and more irregular than those in normal fish, and the gabs between the fiber bundles were greatly enlarged. No evidence of inflammation response was found in the muscle layer. In the hatchery, feed was putting at the position of water inflow, which might attract the fingerings to move toward the feed in spite of incomplete development of their caudal muscle fibers. From these results, it is suggested that the high speed of water current in rearing aquaria might be associated with the development of vertebral abnormality.

• Tunnel and Underground Space
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• v.13 no.5
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• pp.331-343
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• 2003

Though the Grouting has been in use for a long time, it is still regarded as an technique rather than engineering. The study of ground improvement by grouting is rare especially in jointed rock mass. In this study, biaxial compression tests were performed in the jointed rock mass models with .ough surfBce joints assembled with blocks before and after grouting. The load-deformation curves of the jointed rock masses showed a non-linear relationship before grouting but showed a relatively linear deformaion behavior after grouting. Improvement ratio (deformation modulus after grouting/deformation modulus before grouting) decreased with increasing joint spacing and lateral stress. Improvement ratio decreased exponentially with increasing deformation modulus of the rock mass model before grouting. Three-dimensional FDM analysis was performed to a highway tunnel case using experimental data of grouted rock. The convergence of the tunnel predicted after grouting by the numerical modelling coincided with those attained from the field measurement.