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 use of electromagnetic shielding materials continues to grow in terms of research and application at various areas. In this paper, shielding effectiveness measurements are conducted to investigate the behavior of three different materials against electromagnetic fields. These materials are copper wire mesh, galvanized wire mesh, and aluminum plate. The purpose of using wire mesh structures is...
Emanations from the information technology equipment may contain classified information being processed by the device. Shielding is one of the important techniques used for TEMPEST precaution and shielded window films can be viewed as the specific intent to prevent classified information processed within a building/area from being intercepted. The purpose of this work is to investigate the effectiveness...
A new algorithm for voice activity detection in additive nonstationary noise is presented. The algorithm utilizes the differences of the probability distribution properties of noise and speech signal. The Magnitude Density (MDF) and the Magnitude Distribution Functions (MDF) are defined. The noise level is monitored for automatic threshold estimation. The estimate is shown to be accurate also when...
We propose and evaluate three new perceptual audio hash functions. These hash functions are based on a concise description of the time-frequency characteristics. This information can be extracted from the time series of frame-by-frame fundamental period or from the singular value decomposition of the mel frequency cepstral parameters. Experiments show that the proposed perceptual hash functions are...
Communication is possible if the signal from transmitter is demodulated properly in the receiver and the quality of the communication depends on the accuracy of demodulation. In this study, a digital receiver building is developed in order to demodulate variable symbol rate PSK or QAM modulated signal in a nosiy channel under carrier and symbol timing error conditions. According to this purpose a...
In this paper, an SCA based HF waveform implementation on an own developed single board computer hardware (GÖMSİS) is presented. The JTRS program in the United States is developing the SCA Standard which defines the specifications for new generation software defined radios. The software defined radios are expected to gain great flexibility and reconfigurability by the help of this standard. In this...
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.