Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
This chapter discusses some of the challenges faced by modern academic departments and some of the ways to overcome those challenges, as well as the opportunities provided by modern technology, and ways to maximize their potential. Emphasis is placed on optimizing administration and resources to create a dynamic environment that fosters inquiry and original research and to produce academic surgical...
In this paper, a new hybrid Mode Matching- Finite Element-Spectral Decomposition (MM-FE-SD) approach applied to the analysis of finite large arrays is presented. In particular, the MM-FE is applied to the analysis of an infinite phased array of rectangular waveguides feeding arbitrary shaped thick irises. The SD approach allows us to properly combine the results obtained in the case of the infinite...
The continuous interest of both the academic community and the industrial world in wearable devices is driving an ever more extensive research activity on Body Area Networks (BANs). According to the definition provided by the IEEE 802.15 Working Group, they can be defined as a communication system “optimized for low power devices and operation on, in or around the human body (but not limited to humans)...
Body-centric wireless communications continue to raise the interest of the research community, and the major electronics companies now have a line of wearable devices. Applications are becoming more and more complex, requiring high data rate and robust, reliable communication links. The portion of the frequency spectrum currently being considered for Body Area Networks (BAN), which goes up to 10 GHz,...
Reports of ventricular arrhythmias during spaceflights raise the question of whether microgravity increases sudden cardiac death risk. To test if changes in cardiac structure and neurohumoral environment during space flight could alter electrical conduction, we studied both changes in ventricular repolarization (VR) and cardiac echocardiographic parameters in 12 males before and after five days of...
Interest in the use of millimeter wave frequencies for body-centric applications has been recently growing, also thanks to the advances in the realization of compact devices working at V and W bands. In addition, many potential benefits are connected to the presence of unlicensed portions of the spectrum around 60 GHz and 94 GHz, and the possibility of reaching data rates in the order of Gb/s (J....
An extension of the Characteristic Basis Function Method (CBFM) for handling radiating problems involving structures with apertures (slots) is hybridized with a ray tracing based solver to characterize the propagation between a transmitting waveguide antenna and a generic receiver operating at 94 GHz, located in proximity of a human body. Specifically, CBFM is used to estimate the radiation pattern...
A numerical analysis of the electromagnetic propagation in a body centric scenario at 60 GHz is presented in this paper. Both a full wave technique, based on a parallel Finite Difference Time Domain (FDTD) and a ray tracing method, based on a combination of Geometrical Optics and Uniform Theory of Diffraction (GO-UTD), have been used. The results have been compared in terms of path loss values.
Numerical analysis has been presented for a short- range on-body channel at 94 GHz. Finite Difference Time Domain technique has been adopted to investigate the scenario. Since at higher frequency FDTD becomes computationally expensive, a parallel version of the method has been implemented in an in-house software. Path loss values have been calculated for head to shoulder link. Results are compared...
Observability of 60 GHz wireless body area networks is being investigated, in the context of the maximum outdoor detection range for such a network. An off-body channel within a scattering environment has been characterized. By decomposing the detection channel into a free-space channel and a body-local environment channel, an observability estimation model is proposed based on the measured data.
Two metamaterial Electromagnetic Band Gap (EBG) concept-based antennas are presented for applications in Body Area Network (BAN). The antennas work in V band at 60 GHz and are realized by means of a woodpile planar and cylindrical structure respectively. These structures are made of low loss alumina and can be manufactured through extrusion free-forming techniques. Both the here presented antennas...
An antenna for on-body applications based on a cylindrical resonator is presented in this paper. The antenna is designed to work at V-band, specifically in the unlicensed bandwidth around 60GHz.The resonant cavity is obtained by means of a woodpile Electronic Band Gap (EBG) structure made of alumina, and exhibits an omnidirectional radiation pattern on the plane normal to the cylinder axis. Such characteristic...
The study of QT/RR relationship is important for the clinical evaluation of possible risk of ventricular tachyarrhythmia. Our aim was to assess the effects of 5-days of head-down (−6 degrees) bed-rest (HDBR) on ventricular repolarization. High fidelity 12-leads Holter ECG was acquired before (PRE), the last day of HDBR (HDT5), and five days after its conclusion (POST). X, Y, Z leads were derived (inverse...
Current technology scaling is leading to increasingly fragile components, making hardware reliability a primary design consideration. Recently researchers have proposed low-cost reliability solutions that detect hardware faults through software-level symptom monitoring. SWAT (SoftWare Anomaly Treatment), one such solution, demonstrated with microarchitecture-level simulations that symptom-based solutions...
In parallel discrete event simulation techniques, the simulation model is partitioned into objects, concurrently executing events on different CPUs and/or multiple CPU-Cores.In such a context, run-time supports for logical time synchronization across the different simulation objects play a central role in determining the effectiveness of the specific parallel simulation environment. In this paper...
A large but finite array of waveguides, cascaded with an FSS with dissimilar periodicity, is analyzed in this paper by using a combination of the mode matching-finite element method, spectral decomposition (MM-FEM-SD) and method of moments (MoM).
A recent work has presented the design and implementation of a software library, named DyMeLoR, supporting transparent log/restore facilities for optimistic simulation objects with generic memory layout. This library offers the possibility to allocate/deallocate memory chunks via standard API, and performs log/restore of the object state via pack/unpack techniques,exploiting ad-hoc meta-data concisely...
Extreme scaling practices in silicon technology are quickly leading to integrated circuit components with limited reliability, where phenomena such as early-transistor failures, gate-oxide wearout, and transient faults are becoming increasingly common. In order to overcome these issues and develop robust design techniques for large-market silicon ICs, it is necessary to rely on accurate failure analysis...
A new hybrid Mode Matching-Finite Element Method (MM-FEM) [1] and Spectral Decomposition (SD) approach [2][3] is presented for the analysis of large arrays of horn antennas. The proposed methodology (MM-FEM-SD) retains advantages from the three involved techniques. The SD approach is used to reduce the finite large problem to a summation of infinite periodic problems through a Fast Fourier Transform...
A novel hybrid Mode Matching/Finite Element/Spectral Decomposition (MM/FE/SD) approach is applied to the analysis of finite but large arrays. The proposed technique combines the numerical efficiency of the MM procedure and the versatility of the FE method with the capability of the SD to handle the finite problem. In particular, the MM/FE method is employed to obtain the Generalized Scattering Matrix...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.