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Automatic Mesh Generation System for a Novel FEM Modeling Based on Fuzzy Theory
이준성(Joong-Seong Lee),이양창(Yang-Chang Lee),최윤종(Yoon-Jong Choi) 한국지능시스템학회 2005 한국지능시스템학회 학술발표 논문집 Vol.15 No.1
This paper describes an automatic finite element (FE) mesh generation for three-dimensional structures consisting of free-form surfaces. This mesh generation process consists of three subprocesses: (a) definition of geometric model, i.e. analysis model, (b) generation of nodes, and (c) generation of elements. One of commercial sol id modelers is employed for three-dimensional sol id structures. Node is generated if its distance from existing node points is similar to the node spacing function at the point. The node spacing function is well controlled by the fuzzy knowledge processing. The Delaunay method is introduced as a basic tool for element generation. Automatic generation of FE meshes for three-dimensional sol id structures holds great benefits for analyses. Practical performances of the present system are demonstrated through several mesh generations for three-dimensional complex geometry.
악성 위출구 협착에서의 경구적 자가확작형 금속제 인공관 유치의 유용성 : 경내시경적 인공관을 중심으로
조주영,김영석,김진오,이문성,고봉민,심찬섭,조영덕,문종호,유창범,천영국,이준성 대한소화기내시경학회 2000 Clinical Endoscopy Vol.21 No.1
Background/Aims : Placement of stents in cases of inoperable malignant gastric outlet obstruction is difficult due to anatomical and technical problems. The aim of this study was to assess the feasibility, effectiveness, safety, and long-term outcome of a self-expandable metal stent (SEMS) as a means of providing palliative care for patients with an inoperable malignant gastric outlet obstruction, Methods : Fifty-one consecutive patients (53 cases of stent insertion) with onoperable gastric outlet obstruction were treated palliatively with EsophaCoil, Choo's stent, or through-the-scope (TTS) stent. Results : Technical Success was achieved in 46 cases (86.8%). Six cases of stent insertion failure were caused by acute angulation of the stenotic area and sereve distal luminal narrowing. The other failed case was due to the inappropriate location of the stent. In 41 cases, the patients (89.1%) could ingest soft or solid foods after successful insertion of the stents. All the remaining 16 cases of TTS SEMS had technical and clinical successes. During the follow-up (mean; 3.3±1.1 months, range; 1∼11 months), there was 1case of aspiration pneumonia, 1 case of bowel perforation, 2 cases of stent migration, and 2 cases of stent occlusion by tumor ingrowth. Conclusions ; Placement of a SEMS, especially TTS SEMS in patients with malignant gastric outlet obstruction is a feasible, effective, and safe palliative therapy.