8 research outputs found
Efficient baseband modem physical implementation for fixed broadband wireless access networks
No full textEnergy-aware system-on-chip for 5 GHz wireless LANs
No full textThis paper presents the realization of an energy-aware system-on-chip that implements the baseband processing as well as the medium access control and data link control functionalities of a 5 GHz wireless system. It is compliant with the HIPERLAN/2 standard, but it also covers critical functionality of the IEEE 802.11a standard. Two embedded processor cores, dedicated hardware, on-chip memory elements, as well as advanced bus architectures and peripheral inter-faces were carefully combined and optimized for the targeted application, leading to a proper trade-off of silicon area, flexibility and power consumption. A system-level low-power design methodology has been used, due to the fact that power consumption is the most critical parameter in electronic portable system design. The 17.5 million-transistor solution was implemented in a 0.18 μm CMOS pro-cess and performs baseband processing at data rates up to 54 Mbit/s, with average power consumption of about 550 mW
ANALYTICAL MODELING OF OVERSHOOTING EFFECT IN SUB-100 nm CMOS INVERTERS
No full text Modeling of CMOS inverters and consequently, CMOS gates, is a critical task for improving accuracy and speed of simulation in modern sub-100 nm digital circuits. One of the key factors that determine the operation of a CMOS structure is the influence of the input-to-output coupling capacitance, also called overshooting effect. In this paper, an analytical model for this effect is presented, that computes the time period which is necessary to eliminate the extra output charge transferred through the input-to-output capacitance at the beginning of the switching process in a CMOS inverter. In addition, the maximum or minimum output voltage (depending on the considered edge) is analytically computed. The derived model is based on analytical expressions of the CMOS inverter output voltage waveform, which include the influences of both transistor currents and the input-to-output (gate-to-drain) coupling and load capacitances. An accurate version of the alpha-power law MOSFET model is used to relate the terminal voltages to the drain current in sub-100 nm devices, with an extension for varying transistor widths. The resulting model also accounts for the influences of input voltage transition time, transistors' sizes, as well as device carrier velocity saturation and narrow-width effects. The results produced by the presented model for three sub-100 nm CMOS technologies, several input voltage transition times, capacitive loads and device sizes, show very good agreement with BSIM4 HSPICE simulations. </jats:p
AETHER: Self-Adaptive Networked Entities: Autonomous Computing Elements for Future Pervasive Applications and Technologies
No full textSuicide risk factors in university students: A review from the literature
No full textEl objetivo de la investigación es realizar una revisión de la literatura acerca de los factores de riesgo de suicidios en jóvenes universitarios. La metodología utilizada es cuantitativa de corte descriptivo con un enfoque bibliométrico, bajo el método PRISMA. La búsqueda se realizó en tres bases de datos: Clarivate Web of Science, MDPI y Taylor y Francis que tuvieran las variables de factores de riesgo de suicidio. Se utilizaron criterios de inclusión como: variables de estudio, años 2019 a 2022, publicados en español e inglés, reportes científicos resultados de investigación, investigaciones con población clínica y no clínica. Luego, de la aplicación de los operadores booleanos la muestra total es de (n=10360) y posterior al cribado con el método PRISMA (n=45). Resultados: Estados Unidos, seguido de China y Bangladesh, son los países que más producción en el tema. Los factores de riesgos más frecuentes son: depresión, ansiedad, estrés, compromisos académicos, falta de oportunidades, bajos ingresos económicos y raza. Los estudiantes con más altas tasas de suicidio se encuentran en el área de la salud como medicina y enfermería, además, existe más intención de suicidio en mujeres que en hombres.The objective of the research is to carry out a review of the literature about suicide risk factors in young university students. The methodology used is quantitative descriptive with a bibliometric approach, under the PRISMA method. The search was carried out in three databases: Clarivate Web of Science, MDPI and Taylor and Francis that had the variables of suicide risk factors. Inclusion criteria were used such as: study variables, years 2019 to 2022, published in Spanish and English,scientific reports research results, research with clinical and non-clinical population. After the application of the Boolean operators, the total sample is (n=10360) and after screening with the PRISMA method (n=45). Results: The United States, followed by China and Bangladesh, are the countries that produce the most on the subject. The most frequent risk factors are: depression, anxiety, stress, academic commitments, lack of opportunities, low income and race. The students with the highest suicide rates are in the health area such as medicine and nursing, in addition, there is more suicide intent in women than in men
