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Site dependent and spatially varying response spectra

Earthquake Engineering and Engineering Vibration 2019年第3期18卷 497-509页

作者： Hakima Djilali Berkane Zamila Harichane erkan celebi Sidi Mohammed Elachachi Geomaterials Laboratory Hassiba Benbouali University of Chlef Chlef 02180 Algeria Department of Civil Engineering Sakarya University Adapazari Turkey University of Bordeaux I2M GCE Department France

The goal of this study is to provide a stochastic method to investigate the eff ects of the randomness of soil properties due to their natural spatial variability on the response spectra spatial variation at sites with varying conditions. For this purpose, Monte Carlo Simulations are used to include the variability of both incident ground motion and soil parameters in the response spectra by mean of an appropriate coherency loss function and a site-dependent transfer function, respectively. The approach is built on the assumption of vertical propagation of SH type waves in soil strata with uncertain parameters. The response spectra are obtained by numerical integration of the governing equation of a single-degree-of-freedom (SDOF) system under non-stationary site-dependent and spatially varying ground motion accelerations simulated with non-uniform spectral densities and coherency loss functions. Numerical examples showed that randomness of soil properties signifi cantly aff ects the amplitudes of the response spectra, indicating that as the heterogeneity induced by the randomness of the parameters of the medium increases, the spectral ordinates attenuate.

关键词： response spectra randomness spectral density Monte Carlo

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Endoscopic submucosal dissection for premalignant lesions and noninvasive early gastrointestinal cancers

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World Journal of Gastroenterology 2011年第13期17卷 1701-1709页

作者： Sadettin Hulagu Omer Senturk Cem Aygun Orhan Kocaman Altay celebi Tolga Konduk Deniz Koc Goktug Sirin Ugur Korkmaz Ali erkan Duman Neslihan Bozkurt Gokhan Dindar Tan Attila Yesim Gurbuz Orhan TarcinDivision of Gastroenterology Derince State Hospital Kocaeli 41900 Turkey Cem Kalayci Division of Gastroenterology Kocaeli University Medical School Kocaeli 41000 Turkey Division of Gastroenterology American HospitalIstanbul 34365 Turkey Department of Pathology Kocaeli UniversityMedical School Kocaeli 41000 Turkey Division of Gastroenterology Marmara University School of Medicine Altunizade Istanbul 34662 Turkey

AIM: To investigate the indication, feasibility, safety, and clinical utility of endoscopic submucosal dissection (ESD) in the management of various gastrointestinal pathologies. METHODS: The medical records of 60 consecutive patients (34 female, 26 male) who underwent ESD at the gastroenterology department of Kocaeli University from 2006-2010 were examined. Patients selected for ESDhad premalignant lesions or non-invasive early cancers of the gastrointestinal tract and had endoscopic and histological diagnoses. Early cancers were considered to be confined to the submucosa, with no lymph node involvement by means of computed tomography and endosonography. RESULTS: Sixty ESD procedures were performed. The indications were epithelial lesions (n = 39) (33/39 adenoma with high grade dysplasia, 6/39 adenoma with low grade dysplasia), neuroendocrine tumor (n = 7), cancer (n = 7) (5/7 early colorectal cancer, 2/7 early gastric cancer), granular cell tumor (n = 3), gastrointestinal stromal tumor (n = 2), and leiomyoma (n = 2). En bloc and piecemeal resection rates were 91.6% (55/60) and 8.3% (5/60), respectively. Complete and incomplete resection rates were 96.6% (58/60) and 3.3% (2/60), respectively. Complications were major bleeding [n = 3 (5%)] and perforations [n = 5 (8.3%)] (4 colon, 1 stomach). Two patients with colonic perforations and two patients with submucosal lymphatic and microvasculature invasion (1 gastric carcinoid tumor, 1 colonic adenocarcinoma) were referred to surgery. During a mean follow-up of 12 mo, 1 patient with adenoma with high grade dysplasia underwent a second ESD procedure to resect a local recurrence. CONCLUSION: ESD is a feasible and safe method for treatment of premalignant lesions and early malignant gastrointestinal epithelial and subepithelial lesions. Successful en bloc and complete resection of lesions yield high cure rates with low recurrence.

关键词： Endoscopic submucosal dissection Premalignant gastrointestinal lesion Noninvasive early gastrointestinal cancer Neuroendocrine tumor Gastrointestinal stromal tumor

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Results of Montgomery T-Tube in Primary Treatment of Laryngotracheal Stenosis

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International Journal of Otolaryngology and Head & Neck Surgery 2013年第5期2卷 151-155页

作者： Hale Aslan Sedat Oztürkcan Erdem Eren Mehmet Sinan Basoglu Murat Songu erkan Kulduk Ahmet Erdem Kilavuz Hüseyin Katilmis Department of Otorhinolaryngology and Head and Neck Surgery Izmir Katip Celebi Universty Atatürk Research and Training HospitalIzmirTurkey

Introduction: For tracheal stenosis, tracheal resection and anastomosis is widely considered the treatment of choice. However, this surgical approach is not feasible when the glottis and subglottis are involved or in patients with a poor general condition and tracheal stents are a plausible means of providing a permanent or temporary airway opening. Objectives: Evaluate the features and the results of patients with Montgomery T-tube in tracheal stenosis. Methods: Fifteen patients with Myer-Cotton grades 2-3 circular cicatricial tracheal stenosis who received a Montgomery T-tube between 2002-2011 were analyzed in terms of age, gender, etiology, duration of intubation, location and size of the stenotic segment on computed tomography(CT), follow-up time with the T-tube, the complications that occurred after T-tube removed and additional tracheal surgery. Conclusion: A T-tube can be applied in tracheal stenosis at the first treatment before attempting surgery. The patients should be closely followed-up due to the possibility of re-stenosis and other complications.

关键词： Tracheal Stenosis Montgomery T-Tube Complications

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