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A planar wideband balanced antipodal dipole element is proposed. It consists of two parallel printed dipole elements with a balanced antipodal structure. By properly choosing the separation between the dipoles and the length of them, a unidirectional radiation pattern is achieved. Prototypes are fabricated and measured. It is shown that an impedance bandwidth from 4.2 to 13.5 GHz about 105.1% is achieved...
In this paper, a generalized Radio Frequency Identification (RFID) control using posture effect on Ultra High Frequency (UHF) RFID tag detection is proposed. The idea is based on the polarization characteristic of passive tag antenna. When it is placed in horizontal and vertical orientation, the Received Signal Strength Indication (RSSI) measured by the reader antenna will be distinct. Based on the...
Portscanning is a common activity of considerable importance.It is often used by computer attackers to characterize hosts or networks which they are considering hostile activity against. Thus it is useful for system administrators and other network defenders to detect portscans as possible preliminaries to a more serious attack. Thus it is of considerable interest to attackers to determine whether...
In many applications, ranging from network congestion monitoring to data mining, it is often desirable to identify from a large data set whose frequency is above a given threshold. This can help us find out the heaviest users, most popular web sites and so on.Our work focus on packet count heavy hitters finding problem , especially suite for Some attacks such as SYN flood and port scans. These kind...
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