Elektromanyetik dalgaların bakteri gelişimi üzerine etkisi

#nofulltext# --- Conference: Elektromanyetik alanlar ve etkileri sempozyumu. 7-8 Ekim 2011

İletim hattı matris modeli ile mikrostrip hatların analizi

Balık, H. Hasan (Arel Author) --- Conference : Elektrik-Elektronik Bilgisayar Sempozyumu, Elazığ: Fırat Üniversitesi,2011.Elektronik cihazlarda kullanılan teknolojinin hızla ilerlemesi komplex yapıları çıkarmıştır ve komplex yapıların oldukça büyük alanlar kaplaması entegre devreleri ortaya çıkarmıştır. Entegre devrelerde elektromanyetik dalgaların analizi ön plana çıkmaktadır. Mikrostrip hatların küçük olması yüksek frekansların kullanılması analitik ve deneysel yöntemlerin yetersiz kalmasına neden olmuştur. Komplex yapıların analizinde tam dalga analizin kullanılması zorunlu hale gelmiştir. Mikrostrip hatlar bu gün devre tasarımından, yüksek frekansta antene kadar birçok alanda kullanılmaktadır. Yüksek frekanslarda bu yapıların davranışları oldukça önem kazanmaktadır. Bu nedenle bu çalışmada mikrostrip(şerit) hatların İletim Hattı Matris metoduyla tam dalga analizi yapılmıştır

Stoma-free Survival After Rectal Cancer Resection With Anastomotic Leakage: Development and Validation of a Prediction Model in a Large International Cohort.

Objective:To develop and validate a prediction model (STOMA score) for 1-year stoma-free survival in patients with rectal cancer (RC) with anastomotic leakage (AL).Background:AL after RC resection often results in a permanent stoma.Methods:This international retrospective cohort study (TENTACLE-Rectum) encompassed 216 participating centres and included patients who developed AL after RC surgery between 2014 and 2018. Clinically relevant predictors for 1-year stoma-free survival were included in uni and multivariable logistic regression models. The STOMA score was developed and internally validated in a cohort of patients operated between 2014 and 2017, with subsequent temporal validation in a 2018 cohort. The discriminative power and calibration of the models' performance were evaluated.Results:This study included 2499 patients with AL, 1954 in the development cohort and 545 in the validation cohort. Baseline characteristics were comparable. One-year stoma-free survival was 45.0% in the development cohort and 43.7% in the validation cohort. The following predictors were included in the STOMA score: sex, age, American Society of Anestesiologist classification, body mass index, clinical M-disease, neoadjuvant therapy, abdominal and transanal approach, primary defunctioning stoma, multivisceral resection, clinical setting in which AL was diagnosed, postoperative day of AL diagnosis, abdominal contamination, anastomotic defect circumference, bowel wall ischemia, anastomotic fistula, retraction, and reactivation leakage. The STOMA score showed good discrimination and calibration (c-index: 0.71, 95% CI: 0.66-0.76).Conclusions:The STOMA score consists of 18 clinically relevant factors and estimates the individual risk for 1-year stoma-free survival in patients with AL after RC surgery, which may improve patient counseling and give guidance when analyzing the efficacy of different treatment strategies in future studies