The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The following topics were dealt with: systems analysis and automatic control; power electrical systems; communication and signal processing; sensors; circuits; and instrumentation systems.
Surface and bulk acoustic wave (SAW and BAW) devices are suitable as passive wireless sensor elements, called SAW transponders or BAW sensors, for measuring physical quantities e.g. temperature, pressure or specific bio molecules even in liquids. But the sensitivity of the resonance frequency in liquids depends on the polarization of the acoustic wave and therefore shear wave polarizes surface or...
The new EU Directive 2006/32/EC for the improvement of end-use of energy requires among others the introduction of smart metering. Smart metering is basically performed with automated meter reading (AMR). This paper presents a wireless automated meter reading system Siemeca AMR. The system allows the wireless collecting as well as the reading out of the meter values installed in flats in distributed...
Due to their unique electrical and mechanical properties carbon nanotubes (CNTs) are the most studied material in the nanotechnology. These material properties involve interesting advantages for sensors, such as a short reaction time, a higher sensitivity and novel sensing principles. In this paper we evaluate the potential of CNTs for different sensor applications. Although nanotechnology is still...
The paper deals with an approach to improve the cost-effectiveness, the compactness and the reliability of hybrid propulsion systems, in an attempt to enhance their capability to be competitive with the thermal propulsion systems. This could be achieved thanks to the substitution of the conventional three-leg inverters by reduced structure ones. Of particular interest are four-switch and three-switch-delta...
Mechatronics engineering can be defined as the analysis, design, and integration of mechanics with electronics through intelligent controllers. This engineering branch has gained much attention in recent years because of the fast development of integrated engineering applications in the industry. As the requirements for real-time, fast, and accurate controllers increased, the use of Digital Signal...
I have already proposed a paraconsistent annotated logic program called Extended Vector Annotated Logic Program with Strong Negation (EVALPSN), which can deal with defensible deontic reasoning. EVALPSN has been applied to various intelligent control and safety verification systems such as pipeline valve control, railway interlocking safety verification, etc. Moreover, EVALPSN has been developed to...
Technology has often been cited as the major Profiving force behind innovation in higher education and for educational reform in a variety of contexts. Modern digital technologies such as computers, telecommunications, and networks are reshaping and eventually revolutionizing both our society and our social and educational institutions. A new society, the knowledge society is thus arising, the elements...
In this paper, a new design of spatial filter for uniform linear array is presented. The array factor is expressed in terms of cosine, sine and linear functions of frequency which serves as an alternative to Chebyshev polynomials. The simple filter design has good stopband attenuation with the use of trigonometric functions with less filter complexity. Novel slope equalization technique of the filter...
A performance analysis of the effect of embedding an FBG sensor in an optical communications system is presented. The simulations considered focus on the effects on both the sensing and the communications systems. The effect of power levels of the interrogating optical source on the performance of the two systems is also investigated under different excitation levels. The results obtained show a good...
An ultrasonic wave crossing a fluid perpendicularly will be complex modulated by the turbulent structures in the fluid. Because the modulation frequency is low in comparison to the carrier frequency of ultrasound the sidebands are very close to the carrier frequency. The modulation frequency can be separated by demodulation which is achieved by undersampling. . The phase angles can reach high values...
This paper presents a built-in self test (BIST) methodology to measure offset error and gain error of SigmaDelta modulator. This structure is made up of a generator of stimulus and an analyzer of response. We propose a digital technique for the test of static characteristics of the modulator. A memory based signal generator is presented which can concurrently produce test stimuli and reference signals...
In this paper, a novel selective encryption image scheme based on JPEG2000 is proposed, which encrypts only the code-blocks corresponding to some sensitive precincts. In order to improve the security level we introduce the permutation of codeblocks contributing in the selected precincts. Symmetric encryption AES with CFB mode is used to encrypt swapped codeblocks. The idea of combining permutation...
Commonality of various algorithms is analyzed based on the research of algorithms commonly used digital signal processing and a reconfigurable cell is proposed. A reconfigurable system with the cells is designed, which is widely used in a variety of digital signal processing. The principle and method of using this system are discussed with the basic algorithms of digital signal processing - multiplication...
Multi-path effect in HF communication not only changes the amplitude, but changes the phase of receiving signal as well. The rapid and random movement of ionospheric causes the oscillation of the phase. It could be viewed as the Doppler shift of high-frequency carrier caused by ionospheric. The shift of frequency should be corrected because it brings difficulty in recovering the carrier. The non-blind...
Reliability of power distribution schemes can always be improved at the expense of cost and size. The addition of extra paths proves to increase the continuity of supply. This is really where redundancy steps in, with its two constituents: components redundancy and unitpsilas redundancy. This approach is dealt with in this paper and reliability evaluations for various practical distribution schemes...
Wireless digital communications is rapidly expanding resulting in a demand for systems that are reliable and have a high spectral efficiency. To fulfill these demands, the multicarrier modulation scheme, often called Multicarrier direct sequence code division multiplexing access (MC-DS-CDMA), has drawn a lot of attention. On the other hand space time block code-MC-DS-CDMA techniques have been considered...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.