Recent observations on Type-Ia supernovae and low density (Ωm = 0.3) measurement of matter including dark matter suggest that the presentday universe consists mainly of repulsive-gravity type ‘exotic matter’ with negative-pressure often said ‘dark energy’ (Ωx = 0.7). But the nature of dark energy is mysterious and its puzzling questions, such as why, how, where and when about the dark energy, a...

We describe a Polish prosody modelling module for the Festival speech synthesis system. The module uses classification and regression trees for accent type prediction and a linear regression technique for F0 contour generation for these contours. The techniques used to attempt to overcome problems with the only available data are shown. We demonstrate how improvements were achieved by the use o...

The focus of this study is on the attitude estimation of the four-rotor helicopter known as quadrotor. The choice of the algorithm is a complementary filter based on quaternions. For the four-rotor helicopter system has nonlinear, strong coupling, multi-variable features, it is difficult to obtain the accurate attitude values, and in order to solve this problem a quaternion-based complementary ...

In this paper, we study the runtime performance of symmetric cryptographic algorithms on an embedded ARM Cortex-M4 platform. Symmetric can serve to protect integrity and optionally, if supported by algorithm, confidentiality data. A broad range well-established exists, where different typically have properties come with computational complexity. On deeply systems, overhead imposed operations ma...

Abstract The rapid development of China’s economy has promoted the power industry, and more UHV transmission lines have been put into construction. With expansion cable scale, industry’s requirements for quality also increased. In construction transformation lines, crimping cables is an important link that affects entire line. On basis traditional measurement method, this paper designs intellig...

Electrical parameter online measurement is used to monitor the working state of AC motor, to prevent the voltage being too low or the load being too large, to protect the motor safely. The paper mainly discusses the configuration and the principle based on Cortex-M3 for measuring the electrical parameter of alternating motor. The formula is given in the paper that calculates the AC signal harmo...

In this paper we present some results obtained in an ongoing research project aimed at developing a collaborative 3D fantasy virtual learning scenario (which we have given the name Nucleo) for teaching subjects related to computer programming in engineering education and technical schools. Our system has three basic objectives. The first is to induce a change in the students' attitude towards s...