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하악골 절제술후 재이식된 돌결자가골 재이식 : 치험 3례
김 식,김수관,김운규,김수민,류종희,이준길,조경안,김수흥,정태영,여환호 대한악안면성형재건외과학회 2001 Maxillofacial Plastic Reconstructive Surgery Vol.23 No.2
We described three cases of immediate reimplantation of a frozen-thawed autogenous mandible composed of a mixture of iliac bone, marrow, and particulate hydroxyapatite in tumors of the mandible. Acceptable outcomes were obtained in three patients who underwent immediate autogenous mandibular graft reconstruction. The conditions leading to successful outcome of the procedure are also discussed. Reimplantation of frozen autogenous lesioned mandible was performed in three patients with mandibular tumors. Two reimplanted grafts survived without complications following surgery. One case had postoperative infection that resolved with appropriate antibiotic treatment. There were no recurrences of the primary lesions. Satisfactory facial contour after surgery was achieved. These results are most promising, and we believe that, with further refinement, this technique will offer a new and acceptable modality for facial reconstruction in patients with cancer.
3차원 전산화단층촬영 영상을 이용한 안면 연조직 두께 계측의 임상적 유용성
정호걸,김기덕,한승호,허경석,이제범,박혁,최성호,김종관,박창서 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.36 No.2
Purpose : To evaluate clinical usefulness of facial soft tissue thickness measurement using 3D computed tomographic images. Materials and Methods : One cadaver that had sound facial soft tissues was chosen for the study. The cadaver was scanned with a Helical CT under following scanning protocols about slice thickness and table speed; 3 mm and 3 mm/sec, 5 mm and 5 mm/sec, 7 mm and 7 mm/sec. The acquired data were reconstructed 1.5, 2.5, 3.5 mm reconstruction interval respectively and the images were transferred to a personal computer. Using a program developed to measure facial soft tissue thickness in 3D image, the facial soft tissue thickness was measured. After the ten-time repeation of the measurement for ten times, repeated measure analysis of variance (ANOVA) was adopted to compare and analyze the measurements using the three scanning protocols. Comparison according to the areas was analyzed by Mann-Whitney test. Results : There were no statistically significant intraobserver differences in the measurements of the facial soft tissue thickness using the three scanning protocols (p>0.05). There were no statistically significant differences between measurements in the 3 mm slice thickness and those in the 5 mm, 7 mm slice thickness (p>0.05). There were statistical differences in the 14 of the total 30 measured points in the 5 mm slice thickness and 22 in the 7mm slice thickness. Conclusion : The facial soft tissue thickness measurement using 3D images of 7 mm slice thickness is acceptable clinically, but those of 5 mm slice thickness is recommended for the more accurate measurement.
김강부,전종균,엄호성 선문대학교 2000 공학계열 논총 Vol.3 No.-
본 논문에서는 기존 반도체 공장의 세품 정밀도를 개선하기 위한 방안으로 정적보강올 실시하는 구조물에 대하여 동적 응답 을 실험적인 방법과 해석적 방법을 병행하여 예측하였다. 또한, 실험적인 방법과 해석적 방법의 상호적용을 위하여 진동제어 절차서를 제시하였다. 동특성 실험을 통하여 구조물의 지배 모드를 확인 하고, 모델해석과 비교하였다. 해석결과에서는 구조보강 前/後에 대하여 동일한 모드형상을 갖는 고유진동수를 4차까지 선정하여 강성 증가에 따른 변화를 비교하였다. 또한, 정적보강 前/後 구조물의 동적 특성을 비교하기 위하여 격자보 구조물에서 가장 취약할 것으로 판단되는 지점을 가진점으로 선정하여 주파수별 단위 하중에 대한 응답특성을 계산하였다. 실험/해석결과를 바탕으로 구조물의 정적보강을 통한 동적 응답의 기여도를 확인하였다. In this paper, dynamic response about the static stiffening reinforcement of structure by the experimental method and theoretical analysis has been predicted for the improvement of accuracy in the manufacturing process of semiconductor factory. Also, vibration control procedure is presented by the mutual working of the experimental method and theoretical analysis. Dominant vibration mode of the structure has been investigated by the experiments for the dynamic characteristics and compared with the model analysis of the structure. The change due to the increase of stiffening about the same mode shape for the four natural frequencies is investigated after(and before) the reinforcement of structure stiffness. Response characteristic about the weight at each band of frequency has been calculated at the exciting points in which the lattice-type structure has weakness mostly. The effect of dynamic response of the structure with reinforced static stiffness through the experimental and theoretical results is verified.
배관 검사용 Radiometric Scanning System 제작 및 시험
김용균,홍석붕,정종은,이정기,이윤호,정용하 한국비파괴검사학회 2002 한국비파괴검사학회지 Vol.22 No.5
필름을 사용하지 않는 방사선투과검사 시스템인 1차원 Radiometric scanning system을 개발하여 부식 및 침적물이 있는 배관의 두께평가에 적용해 보았다. 개발된 시스템은 단일 방사성 동위원소에서 나오는 방사선을 선형으로 접속하여 시험체를 투과시킨 방사선을 한개의 섬광형 검출기인 BGO를 사용하여 검출하는 single source - single detector alignment system을 제어하는 기계주사 시스템과 제어 프로그램을 개발하였다. 개발된 시스템의 성능을 GEANT4 프로그램을 사용하여 예측하여 보았다. 그리고, 인공결함을 제작하여 넣은 시편과 두께 변화를 준 시편에 적용하여 실제 성능을 평가하였다. 이 시스템은 방사성 동위원소를 이용하여 배관의 부식과 침적물에 의한 두께 변화에 대하여 실시간으로 필름을 사용하지 않고 평가할 수 있는 가능성을 알 수 있었다. One dimensional Radiometric scanning was fabricated and tested as a filmless radiographic inspection system, which could be applied to the evaluation of the corrosion and deposits in the pipeline. This system is composed of the single radioactive source of the collimated focusing beam, and single scintillation detector of BGO, and the mechanical scanning system to transport and align the source and detector, and the operating software to automatically control the mechanical scan system. The performance of the system was simulated using GEANT4 software. This system is applied to one specimen having an artificial flaw(flat bottom hole) in the pipe and other specimen with thickness variation. For the inspection by using the radioactive source in the pipeline, it is possible to evaluate the corrosion and deposits in real time and without film.
김현식,전종균,장현호 선문대학교ㆍ중소기업기술지원연구소 2000 선문공대 연구/기술 논문집 Vol.5 No.1
본 논문에서는 교량 및 건측구조물의 진동문제를 보완하기 위한 방법으로서 자성유체를 이용한 MR 댐퍼를 연구하였다. 또한 자성유체의 특성과 성능에 대하여 연구하였으며, 설계도면을 기초로 MR댐퍼를 제작하였다. 만능재료 시험기를 통해서 주파수와 전류 및 변위를 단계적으로 변화시켜가며 성능실험을 반복적으로 수행하였다. In this paper, magneto rheological damper was studied to solve vibration problems of bridge and structures. Also, characteristics and efffectiveness of magnetic fluid was investigated. MR damper was manufactured on the asis of design drawing. To investigate the efficacy of magneto rheological phenomenon, experiments were performed on sequencies, displacements and electric currents using Universal Testing Machine(UTM).