Robust and Efficient Uncertainty Quantification and Validation of RFIC Isolation

Modern communication and identification products impose demanding constraints on reliability of components. Due to this statistical constraints more and more enter optimization formulations of electronic products. Yield constraints often require efficient sampling techniques to obtain uncertainty quantification also at the tails of the distributions. These sampling techniques should outperform standard Monte Carlo techniques, since these latter ones are normally not efficient enough to deal with tail probabilities. One such a technique, Importance Sampling, has successfully been applied to optimize Static Random Access Memories (SRAMs) while guaranteeing very small failure probabilities, even going beyond 6-sigma variations of parameters involved. Apart from this, emerging uncertainty quantifications techniques offer expansions of the solution that serve as a response surface facility when doing statistics and optimization. To efficiently derive the coefficients in the expansions one either has to solve a large number of problems or a huge combined problem. Here parameterized Model Order Reduction (MOR) techniques can be used to reduce the work load. To also reduce the amount of parameters we identify those that only affect the variance in a minor way. These parameters can simply be set to a fixed value. The remaining parameters can be viewed as dominant. Preservation of the variation also allows to make statements about the approximation accuracy obtained by the parameter-reduced problem. This is illustrated on an RLC circuit. Additionally, the MOR technique used should not affect the variance significantly. Finally we consider a methodology for reliable RFIC isolation using floor-plan modeling and isolation grounding. Simulations show good comparison with measurements

Robot-assisted pelvic evisceration for locally advanced cervical cancer. First experience

Pelvic evacuation in recent years has ceased to be used as a palliative method and has proved to be an effective method of surgical treatment of locally advanced pelvic tumors. Performing these operations with minimally invasive methods helps to reduce the number of postoperative complications and improve the quality of life. Purpose of the study. demonstrate the feasibility of performing robot-assisted pelvic evisceration and compare perioperative parameters with the experience of open pelvic eviscerations. Materials and methods. A 44-year-old woman with progressive local advanced cervical cancer, with a complication of the tumor process, presented by bilateral hydronephrosis. The patient was provided with an anterior robot-assisted PE with the formation ileoconduit by the Brikker method. Results. The total operation time was 515 min, the time in the console was 430 min. The estimated loss of blood was 600 ml, and the stay in the intensive care unit (ICU) - 1 day, the patient was discharged on the 7th day after the operationВведение. Эвисцерация малого таза в последние годы перестала использоваться в качестве паллиативного метода и зарекомендовала себя как эффективный метод хирургического лечения местно-распространенных опухолей малого таза. Выполнение этих операций с помощью минимально инвазивных методов помогает снизить количество послеоперационных осложнений и улучшить качество жизни. Цель исследования. Продемонстрировать целесообразность выполнения роботассистированной эвисцерации малого таза и сравнить периоперационные показатели с опытом открытых эвисцераций малого таза. Материалы и методы. Пациентке, 44-летней женщине с прогрессирующим местно-распространенным раком шейки матки, с осложнением опухолевого процесса, представленным двусторонним гидронефрозом, выполнена передняя робот-ассистированная ЭМт с формированием илеокондуита методом Бриккера. результаты. общее время работы составляло 515 мин, консольное время составляло 430 мин. оцененная потеря крови составляла 600 мл, а пребывание в отделении реанимации и интенсивной терапии – 1 сутки, пациентка выписана на 7 сутки после операци

Optimization of connector-track interface

Connectors significantly influence the total signal transmission on printed circuit board tracks. Experimental results for standard and modified SMA connectors are presented, based on measurements with a vector network analyzer up to 18 GHz. The central pin plays an important role, as it causes a resonant signal reflection near 10 GHz when used at the manufactured length. Reduction of the length (backdrilling) shifts the resonance to higher frequencies and diminishes its amplitude. 3Dsimulations show a good agreement between the calculated transmission parameters and measurement results. Crosstalk measurements show the advantage of the shielded track over the traditional microstrip lines

Shielded tracks on a printed circuit board

Fully shielded tracks can be embedded in multilayer printed circuit boards by a novel manufacturing technique. The paper presents a numerical analysis of the influence of dimension tolerances on the characteristic impedance. For partly shielded tracks the coupling between tracks and the environment is studied as well. The analysis relies on a two-dimensional approach, using Conformal Transformations and a static Method of Moments