This paper presents a new approach to parallel computation of transitive closure queries using a semantic data fragmentation. We assume that tuples of a large base relation denote edges in a graph, which models a transportation network; we propose a fragmentation algorithm which produces the partitioning of the base relation into several fragments such that any fragment corresponds to a subgrap...

detection of lymph nodes (lns) involvement by various pathological processes has great therapeutic and prognostic implications. the purpose of this study was to evaluate the usefulness and accuracy of triplex sonography (gray scale, color mapping and spectral doppler) in differentiating benign from malignant cervical lns. we used triplex sonography to evaluate 120 lns in 50 patients. the gray s...

In this paper the effect of interference of UMTS is analysed on WLAN. The effect is analysed by varying the speed of UMTS nodes. To analyse this effect opnet modeler 14.5 is used. The interference is analysed in terms of Video traffic received, Voice traffic received and Load. Result shows that the better performance has been achieved in the absence of UMTS nodes as compare to their presence in...

Grid Computing in today’s world is a boon for high speed computing. Grids are composed from intersection of clusters, which provide huge volume of computing power. An environment with broadly distributed resources is liable to various types of security attacks. To solve this problem, we use P-LEASEL algorithm, which provides secure multicast communications in grid environment. Kerberos is used ...

In ad-hoc network, mobile nodes are free to move. They can join or leave the network at any moment of time. Due to this dynamicity, working of network may gets disturbed affecting network performance in terms of throughput, delay, fairness. Considering this we have to focus on various parameters of mobile node. This paper focused on speed and packet drop of mobile nodes. Obtained result is usef...

For the HERA-B experiment a processor farm for the third level trigger and full event reconstruction is planned. It will consist of more than 100 processor nodes, receiving data via high speed data links from a switching network. In 1996, a VME-based system (test farm) was built to test a possible implementation. In parallel, investigations of alternative, non-VME-based solutions for the proces...

In this paper we first show that the kernel minimum squared error model is not computationally efficient in feature extraction. To speed up the feature extraction, we linearly express the feature extractor using nodes, i.e. a portion of the training samples in the kernel space. For node selection from the training set, we define two criteria based on Kernel principal component analysis. The nod...

Rapid technological advance in computer and wireless mobile communication has widened the Internet functionality to be practically used in daily’s life. This advancement has offered Internet accessibility at anytime and anywhere including high speed wireless environment such as in high speed trains, fast moving cars etc. However, wireless Quality of Service (QoS) provisioning in such high speed...

A grid-like environment may be constructed from ad hoc processing devices, including portable battery-powered devices. Battery lifetime is a current limitation here. In this paper we propose policies for minimizing power consumption using voluntary collaboration between the autonomously controlled nodes. We exploit the quadratic relationship between processor clock-speed and power consumption t...

To know the location of nodes is very important and valuable for wireless sensor networks (WSN), we present an improved positioning model (3D-PMWSN) to locate the nodes in WSN. In this model, grid in space is presented. When one tag is detected by a certain reader whose position is known, the tag’s position can be known through certain algorithm. The error estimation is given. Emulation shows t...