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Many programs of real-time applications in the area of distribution automation, such as network optimization, Var planning, switching, state estimation, and so forth, require a robust and efficient load flow method for distribution systems. Such a load flow method must be able to model the special features of distribution systems in sufficient detail. Many approaches for unbalanced radial distribution...
With the introduction of revolutionary concept of software-as-a-service, for a number of industries, corporate IT strategy has shifted from a silo mentality with independent and self-contained operating products to a more integrated service vision. However the fact remains that legacy systems with their native operating platforms are still the lifeblood of business. They often represent years of intellectual...
It has been observed by many researchers that the protein coding regions of DNA exhibit a period-3 behavior due to the codon structure. The period-3 property is not present outside coding regions, and can be exploited to locate coding regions. For eukaryotes (cells with nucleus) this periodicity has mostly been observed within the exons and not within the introns. Previously binary indicator sequence...
The global energy crisispsilas has increased the electricity tariff. Recent top up tariff in Sri Lanka has forced the industries to optimize the energy usage in all aspects. In dipped product industry, a larger portion of energy is consumed by the steam and hot water boilers. Further, electrical motors in the boiler play a major role in consuming the electricity. The mostly used energy saving techniques...
This paper discusses the mathematical models & MATLAB simulations of an autonomous robot platform capable of reaching a desired destination starting from a known position in an environment filled with global as well as real time obstacles. Traditionally, such systems use 12 to 24 distance measuring ultrasonic sensors mounted circumferentially around the robot chassis. The modified ranging technique...
Privacy of message during transactions between grid nodes belonging to public realm has become a mounting apprehension for nodes engaged in the communication. While it is imperative to ensure a high level of security for geographically dispersed distributed nodes, privacy issues for concealing individual profiles and identities are worth concerning. Privacy in the user profile management is prime...
A mobile node needs to be configured with a unique IP address. It has been seen that address autoconfiguration is a suitable technique in MANETs because of high mobility of nodes. Extensive survey of previous autoconfiguration related schemes reveal the need for reducing DoS attack, security breaches and improving DAD, QoS and overall performance. This paper also presents a critical study of mobility...
The technique to model DC-DC converters governed by pulse skipping modulation (PSM), which is based on energy balance principle, is not accurate enough. In this paper, an attempt has been made to model them accurately using the discrete-time modeling approach. PSM scheme is essential to improve the efficiency of a DC-DC converter during the light load condition, mainly during standby or sleep mode...
In this paper, we present an innovative way for effective interaction of users with the multimedia contents. We propose a novel framework which enables creation of content information through structural, semantic and media feature based descriptors compliant to MPEG-7 standard. The architecture offers content based search and personalized presentation using SMIL. The content based search exploits...
This paper presents a filter structure for improving the performance of switching band controlled Dynamic Voltage Restorer (DVR) and a systematic design procedure for the passive filter components. The switching operation of VSI is accompanied by a band controller which restricts the injected voltages within a band, defined about a reference voltage. Switching band control method exhibits merits such...
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...
This paper proposes the video object segmentation using block-matching-based self-organization maps and a kernel function. A window covering a target object in a frame is split into units with some pixels. A vector with two elements is provided a unit to quantify its color attributes, and is presented to train a map. It is also presented to classify the units. The trained map then judges the class...
This paper discusses the maximum ground fault resistance, which can be tolerated by a distance relay with Mho characteristic applied at the source node of a distribution feeder. This resistance is defined as the boundary fault resistance which is the boundary of the distance relay correct discrimination between in-zone and out-of-zone faults. The robustness criterion is defined based on the boundary...
It has been established that a voltage source converter when used as a power quality compensator can be used for bidirectional active power exchange across the dc bus, simultaneously. However, it may not be possible to execute all the tasks together to their fullest requirements, if the converter operation is restricted within a specified kVA rating. To ensure the safety of the semiconductor devices...
This work demonstrates the development of Keyword Spotting (KWS) system using Vowel Onset Point (VOP), Vector Quantization (VQ) and Hidden Markov Model(HMM) based techniques. The goal of KWS system is to spot the keywords present in the test speech signal, while neglecting rest of the words. In this work, first independent KWS systems will be developed using VOP, VQ and HMM techniques. Each of these...
This paper proposes a fast and reliable median filter for denoising extremely corrupted images by impulsive noise. A switching median filter with boundary discriminative noise detection (BDND) is very effective and outperforms all previously proposed median-based filters. However, it is very time-consuming in calculation. The proposed method uses similar scheme as in BDND, but it is much more reliable...
Electric power and energy systems are the key for the growth of any developing country. Electric power shortage is one of the main culprits that hinder the spread of development across these countries and cause of societal disparity. Innovative spatial informatics and geographical information system techniques have come as the boon to solve many problems in the electric power system where demographical...
This paper presents a unique comparison between Wavelet Packet Transform (WPT) and Discrete Wavelet Transform (DWT) in the power system harmonics scenario. The signals used are actual tested waveforms which have been obtained using power quality analyzer. The results obtained using WPT and DWT are then compared with IEEE Standard 1459 - 2000 based values. The percentage error has been calculated for...
Blind and elderly persons often require support from a caretaker to move around for day-to-day tasks. Such persons can use assistive devices such as walkers to move around independently. For indoor environments, a camera-based system mounted on an assistive walker can help in automatic following of pre-defined paths. Such indoor paths can be learned visually during training and followed by the walker...
A simple design for realizing a single operational amplifier and single variable resistor amplitude equalizer is proposed. It allows the variation within a specified range Rr of the variable resistor and can achieve the flat response at a specified value Rf of the same resistor with a restriction Rr > 2Rf. The total resistance required is the least and is, therefore, more suitable for economic...
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