A Novel Design Approach to X-Band Minkowski Reflectarray Antennas using the Full-Wave EM Simulation-based Complete Neural Model with a Hybrid GA-NM Algorithm

In this work, a novel multi-objective design optimization procedure is presented for the Minkowski Reflectarray RAs using a complete 3-D CST Microwave Studio MWS-based Multilayer Perceptron Neural Network MLP NN model including the substrate constant εr with a hybrid Genetic GA and Nelder-Mead NM algorithm. The MLP NN model provides an accurate and fast model and establishes the reflection phase of a unit Minkowski RA element as a continuous function within the input domain including the substrate 1 ≤ εr ≤ 6; 0.5mm ≤ h ≤ 3mm in the frequency between 8GHz ≤ f ≤ 12GHz. This design procedure enables a designer to obtain not only the most optimum Minkowski RA design all throughout the X- band, at the same time the optimum Minkowski RAs on the selected substrates. Moreover a design of a fully optimized X-band 15×15 Minkowski RA antenna is given as a worked example with together the tolerance analysis and its performance is also compared with those of the optimized RAs on the selected traditional substrates. Finally it may be concluded that the presented robust and systematic multi-objective design procedure is conveniently applied to the Microstrip Reflectarray RAs constructed from the advanced patches

Design of a Front– End Amplifier for the Maximum Power Delivery and Required Noise by HBMO with Support Vector Microstrip Model

Honey Bee Mating Optimization (HBMO) is a recent swarm-based optimization algorithm to solve highly nonlinear problems, whose based approach combines the powers of simulated annealing, genetic algorithms, and an effective local search heuristic to search for the best possible solution to the problem under investigation within a reasonable computing time. In this work, the HBMO- based design is carried out for a front-end amplifier subject to be a subunit of a radar system in conjunction with a cost effective 3-D SONNET-based Support Vector Regression Machine (SVRM) microstrip model. All the matching microstrip widths, lengths are obtained on a chosen substrate to satisfy the maximum power delivery and the required noise over the required bandwidth of a selected transistor. The proposed HBMO- based design is applied to the design of a typical ultra-wide-band low noise amplifier with NE3512S02 on a substrate of Rogers 4350 for the maximum output power and the noise figure F(f)=1dB within the 5-12 GHz using the T- type of microstrip matching circuits. Furthermore, the effectiveness and efficiency of the proposed HBMO based design are manifested by comparing it with the Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and the simple HBMO based designs

Anesthetic management of laryngectomy and neck dissection surgery: Retrospective analysis [Larenjektomi ve boyun diseksiyonu operasyonlarinda anestezi yönetimi: Retrospektif analiz]

Objective: Laryngectomy and neck dissection are among the special operations in terms of anesthesia management as well as surgical application. In this retrospective study, it was aimed to evaluate the perioperative anesthesia management of the patients who underwent laryngectomy and/or neck dissection operation by the otolaryngology department and discuss. Method: A total of 44 patients between 2014 and 2017 were retrospectively evaluated. Results: The study was completed with 42 patients as all records of 2 could'nt obtained. Forty patients were male and 2 were female. Total laryngectomy+neck dissection was performed in 31 patients(73.8%), total laryngectomy+total thyroidectomy+neck dissection operation was performed in 11 patients (26.2%). Mean blood loss was 239±156 ml. No blood and blood products were transfused for 35 patients (83.3%). Four patients had 1 unit and 3 patients had 2 erythrocyte suspension units. The most common complication observed during the operation was deep hypotension with 23.8% (10 patients). Ephedrine and adrenaline were applied in the treatment of hypotension. Three patients required deep bradycardia for treatment and atropine was administered. Hypocalcemia developed in 12 patients, postoperatively. Conclusion: Laryngectomy and neck dissection operations are special operations in terms of surgery and anesthesia management and require close follow-up for possible peroperative and/or postoperative complications. © 2018 Anestezi Dergisi. All rights reserved