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Caching in mobile environment is complicated by the fact that the caches need to be kept consistent. Consistency in cache can be achieved by the Cache Invalidation Strategies. In this paper we assume synchronous stateful algorithm with the objective to maximize bandwidth utilization. Invalidation Reports (IRs) are periodically broadcasted and Updated Invalidation Reports (UIRs) are broadcasted as...
Microarray technology facilitates the monitoring of the expression profile of a large number of genes across different experimental conditions simultaneously. This article proposes a novel approach that combines a recently proposed multiobjective fuzzy clustering scheme with support vector machine (SVM), to yield improved solutions. The multiobjective technique is first used to produce a set of non-dominated...
In this paper we propose a combined MAC protocol for wireless ad hoc networks that overcome some of the limitations of basic IEEE 802.11b MAC protocol. The proposed protocol involves the concept of cooperation along with persistence to avoid the negative effects caused by multi rate modulation employed by the 802.11b. Unlike basic MAC protocol, the proposed MAC also provides service distinction to...
The paper focuses on enhancement of system static security and to enhance the system performance under network contingencies through an optimal placement and optimal setting of static var compensator (SVC). The goal of the methodology developed is to alleviate/eliminate overloads on the transmission lines and to maintain the voltages at all load buses within their specified limits through an optimal...
Non-stationary signal modeling is a well addressed problem in the literature. Many methods have been proposed to model non-stationary signals such as time varying linear prediction and AM-FM modeling, the later being more popular. Estimation techniques to determine the AM-FM components of narrow-band signal, such as Hilbert transform, DESA1, DESA2, auditory processing approach, ZC approach, etc.,...
In this paper we present a novel generative model using universal prediction technique for burst error characterization in a fading environment. The proposed model has been used to generate burst error sequences as per the statistics of the error sequences observed in waveform level simulation of a link that follows the global system for mobile communication (GSM) standards with channel characteristics...
We have designed a novel query retrieval scheme for the information just in time (iJIT) system to retrieve handwritten annotations from digital documents based on typed/handwritten query. The two key components of the developed query retrieval system (QRS) are the character recognition engine and the query retrieval engine. The character recognition engine uses Tesseract 2.01 open source Optical Character...
Functional Magnetic Resonance Imaging (fMRI) is a non-invasive technique that has been used by neuroscientists as a powerful tool to study human brain functions in response to stimuli. By generating high quality movies of the brain in action, it helps to determine which parts of human brain are activated by different task performances. The process can be modeled as a linear mixture of independent...
The most popular electronic media television snatches out at least a few minutes from all of our daily life. Therefore, it is natural that various production units will try to figure out the most popular programmes during which they can launch advertisements of their products. In this paper, the problem is depicted from the graphical point of view. Vertices denote the programmes on different channels...
Biclustering in microarray data is used to discover a set of genes expressed similarly in a subset of conditions. Biclustering algorithms require to identify coherent and non-trivial biclusters, i.e., the biclusters should have low mean squared residue and high row variance. This article presents a genetic algorithm based biclustering technique that optimizes a combination of these objectives. A novel...
Broadly two solution approaches are used in solving the Transmission Expansion Planning (TEP) problem namely, Load curtailment minimization approach and Overload minimization approach. Overload minimization approach involves lesser computational efforts but has problem of non convergence of loadflow in presence of isolated nodes. In literature, isolated nodes are dealt with modeling system Z-bus with...
In this paper, we propose a new method for frame synchronization in OFDMA mode of WMAN. The scheme is based on the preamble suggested for OFDMA mode of WMAN where the preamble consists of real subsymbols and OFDMA data symbols contain complex subsymbols for each frame. The proposed method is independent of frequency offset and results in sharp peak at the frame boundary. A simple approach for selecting...
In this paper, an automatic segmentation technique of multispectral magnetic resonance image of the brain using a new line symmetry based genetic clustering technique is proposed. The proposed real-coded variable string length genetic clustering technique (VGALS clustering) is able to evolve the number of clusters present in the data set automatically. Here assignment of points to different clusters...
The current DiffServ proposal suffers from an unfair distribution of excess network bandwidth among aggregates and also between TCP and UDP flows. To alleviate this problem, in this paper a new time sliding window based marker has been proposed. The improvement in fairness among TCP aggregates is proved to be over a large range of provision level (20% to 90%) compared to the recently proposed Improved...
Power system security is one of the vital concerns in competitive electricity markets due to delineation of the system controller and the generation owner. This paper presents a new approaches based on artificial neural networks combined with wavelet transform is developed for power system security analysis. The off-line AC load flow calculations are used to construct three kinds of violation indices...
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