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Due to various requirements for the user access control to large databases in the hospitals and the banks, database security has been emphasized. There are many security models for database systems using wide variety of policy-based access control methods. However, they are not functionally enough to meet the requirements for the complicated and various types of access control. In this paper, we propose...
Direction of arrival (DOA) estimation has been a vital area of research since few decades due to its importance in applications like wireless communication, navigation radar, sonar etc. The resolution being one of the main challenges in the direction of arrival estimation can be enhanced by array antenna system with reliable signal processing. In this paper we simulate the high resolution subspace...
The smart antennas are widely used for wireless communication because it has an ability to increase the coverage capacity of a communication system. The main purpose of the smart antenna system is the selection of smart algorithms for adaptive array. On this paper, one of the adaptive beam forming approach used in smart antennas called Recursive Least Square Algorithm (RLS) is presented. The efficiency...
IEEE 802.15.4 is designed for low-cost and low-power wireless personal area networks. The network formation of the IEEE 802.15.4 does not impose constraints on the topology and it contains two topologies: the star topology, the peer-to-peer, and the tree topology. The mesh topology enables robust multi-hop communication and more flexible network, but it induces an additional complexity for providing...
In this paper, we propose a novel multi-hop transmission scheme for minimization of the end-to-end delay between source and destination. The simulation results show that proposed protocol can enhance the end-to-end delay performance and improve energy efficiency by minimizing the idle period of DRP reservation block.
This paper introduces a multiplierless multinomial filter with a simple cascaded form by a base filter. That the phase characteristic of the proposed filter was linear from the phase equation had derived from the transfer function of that. In order to obtain the magnitude characteristic in terms of normalized frequency, the coefficients of the transfer function are required, but it is very difficult...
Wireless USB (WUSB) is the USB (Universal Serial Bus) technology merged with WiMedia PHY/MAC. WUSB can be applied to WPAN (Wireless Personal Area Network) applications as well as PAN applications like wired USB. However the current WUSB protocol can't provide seamless multimedia streaming service to moving WUSB devices in home network environment. This problem causes the critical problems in QoS (Quality...
To avoid a channel interference between WLAN and Wireless Sensor Networks (WSNs), we propose a new Energy Contour Line algorithm using energy detection (ED) scan to detect interference from another network. The simulation results show that the proposed scheme improves coexistence performance required for multi-hop large scale IEEE 802.15.4 networks.
Object tracking is an important task in CMOS camera and color tracking robot. For object tracking, a camera is often utilized to obtain information of construction vehicle motion which can then be employed in coordination controls. Therefore FPGA technology is applied to the prototypical tracking system for vehicles by using a CMOS camera to detect their color tags. We designed the proposed an architecture...
Maritime wireless communication is different from terrestrial wireless communication, due to difference of environments. Nevertheless technologies based on IEEE 802.16e for maritime communication promised to deliver high data rates over large distances and deliver multimedia services and are expected to use e-Navigation system. This paper focuses to simulate on IEEE 802.16e for ship-to-shore maritime...
Wireless USB (WUSB) is the USB technology merged with WiMedia PHY /MAC based on success of wired USB, and it can be applied to various mobile applications such as laptop, cellular phone, etc. However the current WUSB protocol can't recover the link breakage occurred between WUSB host and device. This problem causes the critical problems in QoS provisioning to isochronous streams and mobile applications...
When a mobile node moves to a congested new BS with a general bottleneck link, a new buffer management scheme is proposed to improve utilization of the radio link. The proposed buffer management scheme determines the disposal of buffered packets depending on the degree of congestion. The proposed buffer management approach with considering the handover (Handover-based RED: HRED) provides a new disposal...
For cognitive radio with receive diversity, we propose a novel spectrum sensing scheme in this paper. It is shown that the proposed scheme provides significant performance gain over, and higher level of performance stability than, the conventional schemes in non-Gaussian impulsive noise environment.
Chemical hybrids of imidized waterborne polyurethane (WPU) with silica nanoparticle were synthesized by UV cure. Imide groups were introduced into the hard segment of UV curable WPU by extending the NCO-terminated prepolymers with pyromellitic dianhydride where chemical hybridization by UV cure was made between the acrylate-terminated polyurethane prepolymer and vinyltrimethoxysilane-silica oligomer...
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