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RISS 인기검색어
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- 저자 : Francisco Pires (검색결과 2 건)
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Diagnosis of Bowel Endometriosis Using Endoscopic Ultrasound-guided Fine Needle Aspiration
Ana Catarina Carvalho,Ricardo Cardoso,Francisco Pires,Sofia Ventura,Francisco Portela,Paula Ministro,Américo Silva 대한소화기학회 2023 대한소화기학회지 Vol.81 No.1
Endometriosis is a relatively common gynecological condition in women of reproductive age. The rectosigmoid region is the most commonly affected segment when the gastrointestinal tract is involved. A differential diagnosis of colorectal neoplasia is difficult because of the similar clinical, endoscopic, and radiology findings. A 42-year-old female presented with abdominal distention and was subsequently diagnosed with a large bowel obstruction in the rectum. A temporary colostomy was performed, and endoscopy revealed a rectal mass obstructing the rectum. The biopsy showed normal mucosa, and it was difficult to exclude rectal malignancies even after the imaging workup. Endoscopic ultrasound demonstrated a hypoechoic lesion below the rectal mucosa, and fine needle aspiration confirmed the diagnosis of bowel endometriosis. Bowel endometriosis is a challenging diagnosis. Endoscopic ultrasound- guided fine-needle aspiration is useful for acquiring adequate samples for histological confirmation and a definitive diagnosis of bowel endometriosis.
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Classical and Thermodynamically Consistent Non-local Formulations for Ductile Damage
Jose M.A. Cesar de Sa,Filipe X.C. Andrade,Francisco M. Andrade Pires 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Non-local theories have been commonly used as suitable localisation limiters for plasticity and damage in finite element analysis. Within the non-local framework, two competitive formulations have emerged: the first one is the classical approach, where a previous local model is directly enhanced with a non-local variable; the other one is fully supported on thermodynamical requirements. In this paper, we present two distinct classical non-formulations for elasto-plasticity coupled with damage where we chose damage and the energy release rate as non-local variables. Within the thermodynamically motivated framework, a simultaneous averaging of both damage and its conjugated thermodynamic force is implied from the Clausius-Duhem inequality. The three resulting models are assessed through numerical simulation with finite elements. The results show that the classical non-local model with averaging of the energy release rate may not regularise the solution under certain circumstances. On the other hand, the other two formulations are able to effectively eliminate the pathological mesh dependency.
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