Brno University of Technology

About: Brno University of Technology is a education organization based out in Brno, Czechia. It is known for research contribution in the topics: Fracture mechanics & Filter (video). The organization has 6339 authors who have published 15226 publications receiving 194088 citations. The organization is also known as: Vysoké učení technické v Brně & BUT.

Towards cognitive radio networks: Spectrum utilization measurements in suburb environment

Abstract: This paper deals with spectrum utilization measurements in the frequency band from 100 MHz up to 3 GHz. The measurement is based on the energy detection principle using wideband logarithmically periodic antenna. The results point out the fact, that the frequency spectrum is not utilized in an optimal manner and that there do exist less or more utilized licensed frequency bands that could be possibly used by cognitive radios in an opportunistic way. Cognitive radio concept for better spectrum utilization is introduced here along with an overall approach regarding spectrum utilization in the next generation wireless networks.

Design and Implementation of a 0.3-V Differential Difference Amplifier

Abstract: A new silicon realization of an ultra-low-voltage and ultra-low-power differential-difference amplifier (DDA) is presented in this paper The circuit combines the idea of non-tailed bulk-driven differential pairs with a partial positive feedback used for voltage gain boosting The DDA operates from $V_{\mathbf {DD}}$ ranging from 03 to 05 V For a 03-V version, the circuit provides measured DC voltage gain larger than 60 dB, the GBW product of 185 kHz, PSRR of 57 dB and the average slew-rate of 155 V/ms at 20 pF load capacitance, while consuming only 22 nW of power An instrumentation amplifier based on the proposed DDA showed the THD of 05 % for $V_{\mathbf {in}}=50$ mV $_{\mathbf {pp}}$ , and the 3-dB bandwidth of 750 Hz with the voltage gain of 2 V/V The circuit has been fabricated in a standard n-well $018~\mu \text{m}$ CMOS process from TSMC Chip test results agree with simulations A special design procedure has also been developed that allows the circuit to be optimized under such extreme supply conditions

Structural assessment and reliability analysis for existing engineering structures, theoretical background

Abstract: The concept presented for the safety assessment of concrete structures integrates nonlinear finite element analysis with stochastic and reliability technology into an advanced engineering tool. The basic aim of the stochastic nonlinear analysis is to calculate the safety index of an existing engineering structure, which characterizes its reliability (and failure probability). The nonlinear solution enables a realistic estimation of the structural response statistics to be obtained (failure load, deflections, cracks, stresses, etc.). The possibility of randomization for such computationally intensive problems is shown. Latin hypercube sampling is used in order to keep the number of required simulations at an acceptable level. Statistical correlation, which is important for a realistic solution, is imposed by using a stochastic optimization technique called simulated annealing. The sensitivity of results to random input parameters can be evaluated using nonparametric rank-order correlation coefficients. The...

An efficient list-based scheduling algorithm for high-level synthesis

Abstract: Scheduling is considered as the most important task in high-level synthesis process. This paper presents a novel list-based scheduling algorithm based on incorporating some information extracted from data flow graph (DFG) structure to guide the scheduler to find near-optimal/optimal schedules quickly. We have developed a novel approach based on DFG analysis that is totally done as preparation phase. This DFG analysis information includes: every node knows its successor and its predecessor, total number of successors, and the tree which it belongs to, where trees are constructed from every output operation from the constructed DFG. Incorporating this knowledge in the priority functions of the scheduler guided the scheduler to make the correct choice of the perfect operation to be scheduled next.